Nigel/BarinkOS
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base: Nigel:BasicGraphics
Branches Tags
Nigel:dev Nigel:DebugLogging Nigel:BasicGraphics Nigel:main
..
compare: Nigel:0f730d3f4e0ed431ae7704d5ddb3e87bed9c0862
Branches Tags
Nigel:DebugLogging Nigel:dev Nigel:BasicGraphics Nigel:main

10 Commits
BasicGraph ... 0f730d3f4e

Author SHA1 Message Date
Nigel
0f730d3f4e Improved multiboot compliance 2021-07-22 20:02:47 +01:00
Nigel
bd256f2639 Merge InterruptHandling into MemoryManagement 2021-07-22 19:11:01 +01:00
Nigel
9dc7a05da1 Basic keyboard input 2021-07-21 21:31:57 +01:00
Nigel
59bcc17668 Kernel now responding to keyboard interrupts 2021-05-28 22:20:13 +01:00
Nigel
5f50f8c013 Fix up wrong interrupt handler numbers in boot.s 2021-05-28 22:18:50 +01:00
Nigel
595a7d5163 Nicer time print 2021-05-22 19:24:29 +01:00
Nigel
e84d196b00 Kernel now enter continuous time telling mode 2021-05-18 21:14:26 +01:00
Nigel
f71a3a8ed6 Removed itoa and printf from idt 2021-05-18 21:13:14 +01:00
Nigel
63ea825e2e Added CMOS time read function, Added cariage return support to kterm 2021-05-18 21:11:48 +01:00
Nigel Barink
a094f510d3 More work on interrupt handling, Started timer interrupt implementation, PIC remapped hopefully successfull 2021-05-16 15:53:14 +01:00
67 changed files with 939 additions and 1980 deletions
Expand all files Collapse all files

1
.gitattributes vendored
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@ -1,4 +1,3 @@
*.pdf filter=lfs diff=lfs merge=lfs -text
*.png filter=lfs diff=lfs merge=lfs -text
*.svg filter=lfs diff=lfs merge=lfs -text
demodisk.img filter=lfs diff=lfs merge=lfs -text

9
.gitignore vendored
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@ -1,8 +1 @@
build
CON
.vscode
isodir/
root/
*.iso
*.img
build

16
.vscode/c_cpp_properties.json vendored Normal file
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@ -0,0 +1,16 @@
{
"configurations": [
{
"name": "Linux",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [],
"compilerPath": "/usr/bin/gcc",
"cStandard": "gnu17",
"cppStandard": "gnu++14",
"intelliSenseMode": "linux-gcc-x64"
}
],
"version": 4
}

64
Makefile
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@ -5,7 +5,7 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
CPP = ${HOME}/opt/cross/bin/i686-elf-g++
CFLAGS = -ffreestanding -O2 -Wall -Wextra
OFILES = $(BUILD_DIR)/boot.o $(BUILD_DIR)/window.o $(BUILD_DIR)/cursor.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/PhysicalMemoryManager.o $(BUILD_DIR)/io.o $(BUILD_DIR)/vesa.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
OFILES = $(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/io.o $(BUILD_DIR)/MMU.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o
SRC_DIR = src
BUILD_DIR = build
@ -19,29 +19,16 @@ OBJ_LINK_LIST = $(CRTI_OBJ) $(CRTBEGIN_OBJ) $(OFILES) $(CRTEND_OBJ) $(CRTN_OBJ)
INTERNAL_OBJS = $(CRTI_OBJ) $(OFILES) $(CRTN_OBJ)
all: clean build
all: clean build
build: build_kernel iso
build: build_kernel run
clean_iso:
if [[ -a isodir/boot ]] ; then rm root/boot -rd ; fi
if [ -f build/barinkOS.iso ] ; then rm build/barinkOS.iso ; fi
iso: clean_iso clean build
mkdir -p root/boot/grub
cp build/myos.bin root/boot/myos.bin
cp src/grub.cfg root/boot/grub/grub.cfg
grub-mkrescue -o build/barinkOS.iso root
test:
$(EMULATOR) -kernel $(BUILD_DIR)/myos.bin -serial mon:stdio -vga std -display gtk -m 2G -cpu core2duo # -monitor stdio
test_iso:
$(EMULATOR) -cdrom build/barinkOS.iso -serial mon:stdio -vga std -display gtk -m 2G -cpu core2duo
run:
$(EMULATOR) -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std
build_kernel: $(OBJ_LINK_LIST)
$(CC) -T $(SRC_DIR)/kernel//linker.ld -o $(BUILD_DIR)/myos.bin \
$(CC) -T $(SRC_DIR)/kernel/arch/i386/linker.ld -o $(BUILD_DIR)/myos.bin \
-ffreestanding -O2 -nostdlib $(OBJ_LINK_LIST) -lgcc
build_x86_64:
@ -52,47 +39,28 @@ clean:
rm -f $(BUILD_DIR)/myos.bin $(INTERNAL_OBJS)
$(BUILD_DIR)/kernel.o:
$(CPP) -c $(SRC_DIR)/kernel/kernel.cpp -o $(BUILD_DIR)/kernel.o $(CFLAGS) -fno-exceptions -fno-rtti -fpermissive
$(CPP) -c $(SRC_DIR)/kernel/kernel.cpp -o $(BUILD_DIR)/kernel.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/kterm.o:
$(CPP) -c $(SRC_DIR)/kernel/tty/kterm.cpp -o $(BUILD_DIR)/kterm.o $(CFLAGS) -fno-exceptions -fno-rtti
$(CC) -c $(SRC_DIR)/kernel/arch/i386/tty/kterm.c -o $(BUILD_DIR)/kterm.o $(CFLAGS) -std=gnu99
$(BUILD_DIR)/boot.o:
$(AS) $(SRC_DIR)/kernel//boot.S -o $(BUILD_DIR)/boot.o
$(AS) $(SRC_DIR)/kernel/arch/i386/boot.s -o $(BUILD_DIR)/boot.o
$(BUILD_DIR)/crti.o:
$(AS) $(SRC_DIR)/kernel/crti.s -o $(BUILD_DIR)/crti.o
$(AS) $(SRC_DIR)/kernel/arch/i386/crti.s -o $(BUILD_DIR)/crti.o
$(BUILD_DIR)/crtn.o:
$(AS) $(SRC_DIR)/kernel/crtn.s -o $(BUILD_DIR)/crtn.o
$(AS) $(SRC_DIR)/kernel/arch/i386/crtn.s -o $(BUILD_DIR)/crtn.o
$(BUILD_DIR)/io.o:
$(CPP) -c $(SRC_DIR)/kernel/io.cpp -o $(BUILD_DIR)/io.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/PageDirectory.o:
$(CPP) -c $(SRC_DIR)/kernel/memory/PageDirectory.cpp -o $(BUILD_DIR)/PageDirectory.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/MMU.o:
$(CPP) -c $(SRC_DIR)/kernel/MMU.cpp -o $(BUILD_DIR)/MMU.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/idt.o:
$(CPP) -c $(SRC_DIR)/kernel/idt/idt.cpp -o $(BUILD_DIR)/idt.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/gdtc.o:
$(CPP) -c $(SRC_DIR)/kernel/gdt/gdtc.cpp -o $(BUILD_DIR)/gdtc.o $(CFLAGS) -fno-exceptions -fno-rtti
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/idt/idt.cpp -o $(BUILD_DIR)/idt.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/pic.o:
$(CPP) -c $(SRC_DIR)/kernel/pic/pic.cpp -o $(BUILD_DIR)/pic.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/string.o:
$(CC) -c $(SRC_DIR)/libc/include/string.c -o $(BUILD_DIR)/string.o $(CFLAGS) -std=gnu99
$(BUILD_DIR)/PhysicalMemoryManager.o:
$(CPP) -c $(SRC_DIR)/kernel/memory/PhysicalMemoryManager.cpp -o $(BUILD_DIR)/PhysicalMemoryManager.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/vesa.o:
$(CPP) -c $(SRC_DIR)/kernel/drivers/vesa/vesa.cpp -o $(BUILD_DIR)/vesa.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/window.o:
$(CPP) -c $(SRC_DIR)/gui/window.cpp -o $(BUILD_DIR)/window.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/cursor.o:
$(CPP) -c $(SRC_DIR)/gui/cursor.cpp -o $(BUILD_DIR)/cursor.o $(CFLAGS) -fno-exceptions -fno-rtti
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/pic/pic.cpp -o $(BUILD_DIR)/pic.o $(CFLAGS) -fno-exceptions -fno-rtti

16
README.md
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@ -6,24 +6,22 @@
________________________
### Screenshot(s)
![Graphics mode](screenshots/BarinkOS_VBE_GRAPHICS.png) \
It may not look like much but I am proud of it! We are in graphics mode.
![Scrolling the terminal](screenshots/Screenshot1.png) \
The first scrolling boot screen. 😲
![Interrupt handeling](screenshots/WIP_interruptHandling.png) \
<img src="screenshots/WIP_interruptHandling.png"></img>
W.I.P - Working on interrupt handling
![Multiboot integration](screenshots/multiboot.png) \
Multiboot information can be read by the kernel.
________________________
### The goal
Writing a hobby operating system to better understand the basic building blocks of any operating system.
________________________
### Operating System Technical specs/details
The operating system can print strings to the
@ -31,8 +29,8 @@ screen. The terminal/screen has scrolling so the latest messages are visible on
________________________
### Planning
[See TODO](todo.md) \
[See Features](features.md)
[See TODO](TODO.md)
________________________
### Docs
[Intro](docs/Intro.md) \

24
features.md → TODO.md
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@ -3,16 +3,16 @@
<input type="checkbox" checked/> Setup Cross-Compiler \
<input type="checkbox" checked/> Multiboot to kernel \
<input type="checkbox" checked/> Printing string to the screen \
<input type="checkbox" checked/> Printing values/numbers to the screen (a.k.k itoa) \
<input type="checkbox" checked/> Extend Multiboot implementation \
<input type="checkbox" /> Printing values/numbers to the screen (a.k.k itoa) \
<input type="checkbox" /> Extend Multiboot implementation \
<input type="checkbox" checked/> Output to serial port \
<input type="checkbox" checked/> Move to protected mode \
<input type="checkbox" checked/> Enabel CMOS clock \
<input type="checkbox" /> Move to protected mode \
<input type="checkbox" /> Enabel CMOS clock \
<input type="checkbox" /> Time measurement (PIC &| PIT) \
<input type="checkbox" /> Detect CPU speed \
<input type="checkbox" checked/> Interrupt / exception system (API) \
<input type="checkbox" /> Interrupt / exception system (API) \
<input type="checkbox" checked/> Plan your memory map (virtual, and physical) : decide where you want the data to be. \
<input type="checkbox" /> Plan your memory map (virtual, and physical) : decide where you want the data to be. \
<input type="checkbox" /> The heap: allocating memory at runtime (malloc and free) is almost impossible to go without. \
<input type="checkbox" /> Enable SIMD Extensions (SSE)
@ -23,13 +23,13 @@
<input type="checkbox" /> ACPI support ( Or some other basic way to support shutdown, reboot and possibly hibernation ) \
<input type="checkbox" /> ATAPI support \
<input type="checkbox" /> Keyboard support ( P/S2 Keyboard) \
<input type="checkbox" checked/> Memory Management (MMU)
<input type="checkbox" /> Preemptive multi tasking \
<input type="checkbox" /> Processes \
<input type="checkbox" /> Memory Management (MMU)\
<input type="checkbox" /> Preemptive multi tasking
<input type="checkbox" /> Processes
<input type="checkbox" /> Threads
<input type="checkbox" /> Scheduling (SRV2 Unix OR Priority Based Round Robin) \
<input type="checkbox" /> System V ABI compliance (partially) \
<input type="checkbox" /> POSIX compliance (partially) \
<input type="checkbox" /> System V ABI compliance (partially)
<input type="checkbox" /> POSIX compliance (partially)
<input type="checkbox" /> RPC - for interprocess communication \
<input type="checkbox" /> Sync primitives - Semaphores, Mutexes, spinlocks et al. \
<input type="checkbox" /> Basic Terminal \
@ -37,4 +37,4 @@
<input type="checkbox" /> Basic Window server/client \
## Support for more filesystems if I like the challenge in writing these ...
<input type="checkbox" /> FAT Filesystem \
<input type="checkbox" /> EXT2 Filesystem
<input type="checkbox" /> EXT2 Filesystem \

0
todo.md → screenshots/.blank
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BIN
screenshots/BarinkOS_VBE_GRAPHICS.png (Stored with Git LFS)
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BIN
screenshots/WIP_interruptHandling.png
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Side by Side Swipe Overlay

Before

Width:  |  Height:  |  Size: 130 B

After

Width:  |  Height:  |  Size: 16 KiB

BIN
screenshots/multiboot.png (Stored with Git LFS)
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Binary file not shown.

3
src/grub.cfg
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@ -1,3 +0,0 @@
menuentry "BarinkOS"{
multiboot /boot/myos.bin
}

5
src/gui/Graphics.h
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@ -1,5 +0,0 @@
#pragma once
class Graphics {
};

7
src/gui/Widget.h
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@ -1,7 +0,0 @@
#pragma once
class Widget{
virtual void draw();
};

17
src/gui/cursor.cpp
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@ -1,17 +0,0 @@
#include "cursor.h"
void Cursor::draw(){
for(int i = 0; i < this->width; i++){
for(int j = 0; j < this->height; j++){
if(this->bitmap[j * this->width + i] == 1 ){
putPixel(i + this->x,j + this->y, 0xFF000000);
}
}
}
}
Cursor::Cursor(int x, int y){
this->x = x;
this->y = y;
}

38
src/gui/cursor.h
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@ -1,38 +0,0 @@
#pragma once
#include "../kernel/drivers/vesa/vesa.h"
class Cursor{
public:
void draw();
Cursor(int x, int y);
private:
int x;
int y;
const int width= 16;
const int height= 10;
const int bitmap [160] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,
0,0,0,0,0,0,0,1,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,
0,0,0,0,0,1,1,1,1,1,1,1,1,1,0,0,
0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
};

33
src/gui/window.cpp
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@ -1,33 +0,0 @@
#include "window.h"
int Window::getWidth(){
return this->rect.width;
}
int Window::getHeight(){
return this->rect.height;
}
void Window::setWidth(int& width){
this->rect.width = width;
}
void Window::setHeight(int& height){
this->rect.height = height;
}
int Window::getX(){
return this->rect.x;
}
int Window::getY(){
return this->rect.y;
}
Window::Window (Rect& rect , uint32_t colour){
this->rect = rect;
this->Background_colour = colour;
}
void Window::draw(){
drawRect(this->getX() , this->getY() , this->getWidth() , this->getHeight() ,this->Background_colour );
}

37
src/gui/window.h
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@ -1,37 +0,0 @@
#pragma once
#include "../kernel/drivers/vesa/vesa.h"
#include "Widget.h"
struct Rect {
int width;
int height;
int x;
int y;
};
class Window : Widget{
public:
int getX();
int getY();
int getWidth();
int getHeight();
void setWidth(int&);
void setHeight(int&);
Window (Rect& rect , uint32_t colour);
void draw();
private:
Rect rect;
uint32_t Background_colour;
};

22
src/kernel/memory/PageDirectory.cpp → src/kernel/MMU.cpp
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@ -1,10 +1,9 @@
#include "PageDirectory.h"
#include <stdint.h>
#include "MMU.h"
void PageDirectory::enable(){
// https://wiki.osdev.org/Setting_Up_Paging
void MMU::enable(){
//set each entry to not present
int i;
for(i = 0; i < 1024; i++)
@ -35,13 +34,8 @@ void PageDirectory::enable(){
enablePaging();
}
/*
void IdentityPaging(uint32_t *first_pte, vaddr from, int size)
{
from = from & 0xFFFFF000; // Discard the bits we don't want
for (; size > 0; from += 4096, first_pte++)
{
*first_pte = from | 1; // makr page present.
}
}
*/
uint32_t MMU::readTableEntry(int entry){
return this->page_directory[entry];
}

15
src/kernel/MMU.h Normal file
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@ -0,0 +1,15 @@
#pragma once
#include <stdint.h>
extern "C" void loadPageDirectory (long unsigned int* addr );
extern "C" void enablePaging();
class MMU {
public:
void enable ();
uint32_t readTableEntry(int);
private:
uint32_t page_directory[1024] __attribute__((aligned(4096)));
uint32_t first_page_table[1024] __attribute__((aligned(4096)));
};

0
src/kernel/memory/SlabAllocator.h → src/kernel/arch/i386/MMU/SlabAllocator.h
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566
src/kernel/arch/i386/boot.s Normal file
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@ -0,0 +1,566 @@
/*
* Multiboot
*/
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
.set MEMINFO, 1<<1 /* provide memory map */
.set FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
.section .multiboot
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM
.section .bss
.align 16
stack_bottom:
.skip 16384 # 16 KiB
stack_top:
.section .text
/*
* Interupt handlers
*/
# NOTE: I have no clue how I should use these macros.
# Have tried to use them in a myriad of ways, none would actually work
.macro irs_NoErrCode code:req
.globl irs\code
irs\code:
cli
pushb $0
pushb \code
jmp irs_common
.endm
.macro irs_ErrCode code
.globl irs\code
irs\code:
cli
pushb \code
jmp irs_common
.endm
.globl irs0
irs0:
cli
push $0
push $0
jmp irs_common
.globl irs1
irs1:
cli
push $0
push $1
jmp irs_common
.globl irs2
irs2:
cli
push $0
push $2
jmp irs_common
.globl irs3
irs3:
cli
push $0
push $3
jmp irs_common
.globl irs4
irs4:
cli
push $0
push $4
jmp irs_common
.globl irs5
irs5:
cli
push $0
push $5
jmp irs_common
.globl irs6
irs6:
cli
push $0
push $6
jmp irs_common
.globl irs7
irs7:
cli
push $0
push $7
jmp irs_common
.globl irs8
irs8:
cli
push $0
push $8
jmp irs_common
.globl irs9
irs9:
cli
push $0
push $9
jmp irs_common
.globl irs10
irs10:
cli
push $0
push $10
jmp irs_common
.globl irs11
irs11:
cli
push $0
push $11
jmp irs_common
.globl irs12
irs12:
cli
push $0
push $12
jmp irs_common
.globl irs13
irs13:
cli
push $13
jmp irs_common
.globl irs14
irs14:
cli
push $0
push $14
jmp irs_common
.globl irs15
irs15:
cli
push $0
push $15
jmp irs_common
.globl irs16
irs16:
cli
push $0
push $16
jmp irs_common
.globl irs17
irs17:
cli
push $0
push $17
jmp irs_common
.globl irs18
irs18:
cli
push $0
push $18
jmp irs_common
.globl irs19
irs19:
cli
push $0
push $19
jmp irs_common
.globl irs20
irs20:
cli
push $0
push $20
jmp irs_common
.globl irs21
irs21:
cli
push $0
push $21
jmp irs_common
.globl irs22
irs22:
cli
push $0
push $22
jmp irs_common
.globl irs23
irs23:
cli
push $0
push $23
jmp irs_common
.globl irs24
irs24:
cli
push $0
push $24
jmp irs_common
.globl irs25
irs25:
cli
push $0
push $25
jmp irs_common
.globl irs26
irs26:
cli
push $0
push $26
jmp irs_common
.globl irs27
irs27:
cli
push $0
push $27
jmp irs_common
.globl irs28
irs28:
cli
push $0
push $28
jmp irs_common
.globl irs29
irs29:
cli
push $0
push $29
jmp irs_common
.globl irs30
irs30:
cli
push $0
push $30
jmp irs_common
.globl irs31
irs31:
cli
push $0
push $31
jmp irs_common
.globl irq0
irq0:
cli
push $0
push $0
jmp irq_common
.globl irq1
irq1:
cli
push $0
push $1
jmp irq_common
.globl irq2
irq2:
cli
push $0
push $2
jmp irq_common
.globl irq3
irq3:
cli
push $0
push $3
jmp irq_common
.globl irq4
irq4:
cli
push $0
push $4
jmp irq_common
.globl irq5
irq5:
cli
push $0
push $5
jmp irq_common
.globl irq6
irq6:
cli
push $0
push $6
jmp irq_common
.globl irq7
irq7:
cli
push $0
push $7
jmp irq_common
.globl irq8
irq8:
cli
push $0
push $8
jmp irq_common
.globl irq9
irq9:
cli
push $0
push $9
jmp irq_common
.globl irq10
irq10:
cli
push $0
push $10
jmp irq_common
.globl irq11
irq11:
cli
push $0
push $11
jmp irq_common
.globl irq12
irq12:
cli
push $0
push $12
jmp irq_common
.globl irq13
irq13:
cli
push $0
push $13
jmp irq_common
.globl irq14
irq14:
cli
push $0
push $14
jmp irq_common
.globl irq15
irq15:
cli
push $0
push $15
jmp irq_common
irq_common:
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
call irq_handler
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp # cleans push error and irs code
sti
iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
irs_common:
pusha # Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
mov %ds, %ax
push %eax
/* load the kernel data segment descriptor*/
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
call irs_handler
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp # cleans push error and irs code
sti
iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP
.globl idt_flush
idt_flush:
mov 4(%esp), %eax
lidt (%eax)
ret
.globl enablePaging
enablePaging:
push %ebp
mov %esp, %ebp
mov %cr0, %eax
or $0x80000000, %eax
mov %eax, %cr0
mov %ebp, %esp
pop %ebp
ret
.globl loadPageDirectory
loadPageDirectory:
push %ebp
mov %esp, %ebp
mov 8(%esp), %eax
mov %eax, %cr3
mov %ebp, %esp
pop %ebp
ret
.global _start
.type _start, @function
_start:
/*Setup the stack pointer to point to the beginning of our stack */
/* I believe its a hight address growing down to lower adress for the stack on x86*/
mov $stack_top, %esp
/*Reset EFLAGS*/
pushl $0
popf
/* push the pointer to the Multiboot information structure*/
pushl %ebx
/* push the magic value */
pushl %eax
call early_main
cli
load_gdt:
lgdt gdt
# set the segment selecters
movw $0x10, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
ljmp $0x08, $flush
flush:
#load idt
call init_idt
sti
# Try enable A20
# mov $0x2401, %ax
# int $0x15
# enable protected mode
mov %cr0, %eax
or $1, %eax
mov %eax, %cr0
call kernel_main
cli
1: hlt
jmp 1b
/* Tell processor to use our gdt*/
gdt:
.word (gdt_end - gdt_start -1) # Size of the GDT in bytes minus 1 for math reasons
.int gdt_start # linear address of our GDT
.att_syntax
.size _start, . - _start
/*
* Create the GDT
*/
.section .data
gdt_start:
gdt_null:
.long 0x0
.long 0x0
gdt_kcode:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10011010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_kdata:
.word 0xFFFF # limit
.word 0x0 # base
.byte 0x0 # base
.byte 0b10010010 # 1st flags | type flags
.byte 0b11001111 # 2nd flags | limit
.byte 0x0 # base
gdt_end:

0
src/kernel/crti.s → src/kernel/arch/i386/crti.s
View File

0
src/kernel/crtn.s → src/kernel/arch/i386/crtn.s
View File

29
src/kernel/arch/i386/gdt/gdtc.cpp Normal file
View File

@ -0,0 +1,29 @@
#include "gdtc.h"
gdtEntry_t gdt[3];
void gdtSetGate(int num, uint64_t base, uint64_t limit, uint8_t access,
uint8_t gran){
gdt[num].lBase = (base & 0xFFFF);
gdt[num].mBase = (base >> 16) & 0xFF;
gdt[num].hBase = (base >> 24) & 0xFF;
gdt[num].lLimit = (limit & 0xFFFF);
gdt[num].granularity = ((limit >> 16) & 0x0F);
gdt[num].granularity |= (gran & 0xF0);
gdt[num].access = access;
}
void setupGdt(){
gdtPointer.limit = (sizeof(gdtEntry_t) * 3) - 1;
gdtPointer.base = &gdt;
gdtSetGate(0, 0, 0, 0, 0);
gdtSetGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
gdtSetGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
loadGdt();
}

20
src/kernel/arch/i386/gdt/gdtc.h Normal file
View File

@ -0,0 +1,20 @@
#include <stdint.h>
extern "c"{
typedef struct {
uint16_t lLimit;
uint16_t lBase;
uint8_t mBase;
uint8_t access;
uint8_t granularity;
uint8_t hBase;
} gdtEntry_t;
struct {
uint16_t limit;
uint32_t base;
} gdtPointer;
extern void loadGdt();
void setupGdt();
}

5
src/kernel/idt/idt.cpp → src/kernel/arch/i386/idt/idt.cpp
View File

@ -23,9 +23,6 @@ void irs_handler (registers regs) {
printf(" Error code: %d \n", regs.err_code);
}
}
@ -44,7 +41,7 @@ void irq_handler (registers regs) {
// Keyboard interrupt !!
int scan;
/*register*/int i;
register int i;
// Read scancode

5
src/kernel/idt/idt.h → src/kernel/arch/i386/idt/idt.h
View File

@ -5,7 +5,10 @@
#include "../vga/colors.h"
#include "../pic/pic.h"
#include "../tty/kterm.h"
extern "C"{
#include "../tty/kterm.h"
}
#define AS_KERNEL() ( kterm_writestring("[KERNEL]:"))
extern "C" {

0
src/kernel/idt/scancodes/set1.h → src/kernel/arch/i386/idt/scancodes/set1.h
View File

8
src/kernel/linker.ld → src/kernel/arch/i386/linker.ld
View File

@ -6,11 +6,10 @@ ENTRY(_start)
kernel image. */
SECTIONS
{
/* Begin putting sections at 1 MiB, a conventional place for kernels to be
loaded at by the bootloader. */
. = 1M;
kernel_begin = .;
/* First put the multiboot header, as it is required to be put very early
early in the image or the bootloader won't recognize the file format.
Next we'll put the .text section. */
@ -41,7 +40,4 @@ SECTIONS
/* The compiler may produce other sections, by default it will put them in
a segment with the same name. Simply add stuff here as needed. */
kernel_end = .;
}
}

0
src/kernel/pic/pic.cpp → src/kernel/arch/i386/pic/pic.cpp
View File

4
src/kernel/pic/pic.h → src/kernel/arch/i386/pic/pic.h
View File

@ -1,5 +1,5 @@
#pragma once
#include "../io.h"
#include "../../../io.h"
#define PIC1 0x20 /* IO base address for master PIC */
#define PIC2 0xA0 /* IO base address for slave PIC */
@ -49,7 +49,7 @@ void PIC_sendEOI (unsigned char irq);
}
//static uint16_t __pic_get_irq_reg(int ocw3);
static uint16_t __pic_get_irq_reg(int ocw3);
uint16_t pic_get_irr(void);
uint16_t pic_get_isr(void);

0
src/kernel/ports/serial.cpp → src/kernel/arch/i386/ports/serial.cpp
View File

0
src/kernel/ports/serial.h → src/kernel/arch/i386/ports/serial.h
View File

50
src/kernel/tty/kterm.cpp → src/kernel/arch/i386/tty/kterm.c
View File

@ -1,5 +1,4 @@
#include "kterm.h"
static const size_t VGA_WIDTH = 80;
static const size_t VGA_HEIGHT = 25;
@ -47,48 +46,6 @@ void kterm_putat (char c, uint8_t color, size_t x, size_t y ) {
}
void enable_cursor (uint8_t start_cursor , uint8_t end_cursor ){
outb(0x3D4, 0x0A);
outb(0x3D5, (inb(0x3D5) & 0xC0) | start_cursor);
outb(0x3D4, 0x0B);
outb(0x3D5, (inb(0x3D5) & 0xE0) | end_cursor);
}
void disable_cursor()
{
outb(0x3D4, 0x0A);
outb(0x3D5, 0x20);
}
void update_cursor(int x, int y){
uint16_t pos = y * VGA_WIDTH + x;
outb(0x3D4, 0x0F);
outb(0x3D5, (uint8_t) (pos & 0xFF));
outb(0x3D4, 0x0E);
outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
}
uint16_t get_cursor_position(){
uint16_t pos = 0;
outb(0x3D4, 0x0F);
pos |= inb(0x3D5);
outb(0x3D4, 0x0E);
pos |= ((uint16_t) inb(0x3D5)) << 8;
return pos;
}
int get_cursor_x (uint16_t cursor_pos) {
return cursor_pos % VGA_WIDTH;
}
int get_cursor_y (uint16_t cursor_pos ) {
return cursor_pos / VGA_WIDTH;
}
/**
* With the help from:
@ -106,7 +63,6 @@ void kterm_scrollup(){
void kterm_put (char c) {
if(++kterm_column == VGA_WIDTH || c == '\n' ) {
update_cursor(kterm_column , kterm_row);
kterm_column = 0;
if(kterm_row == VGA_HEIGHT-1 ) {
kterm_scrollup();
@ -137,7 +93,7 @@ void kterm_writestring(const char* data ){
}
void itoa (char *buf, int base, int d) {
static void itoa (char *buf, int base, int d) {
char *p = buf;
char *p1, *p2;
unsigned long ud = d;
@ -174,7 +130,7 @@ void itoa (char *buf, int base, int d) {
}
void printf ( const char *format, ...) {
return;
char **arg = (char **)&format;
int c;
char buf[20];
@ -202,7 +158,7 @@ void printf ( const char *format, ...) {
switch (c)
{
case 'd':
case 'u':
case 'x':
itoa(buf, c, *((int *) arg++));

17
src/kernel/tty/kterm.h → src/kernel/arch/i386/tty/kterm.h
View File

@ -5,19 +5,12 @@
#include <stdbool.h>
#include "../vga/colors.h"
#include "../io.h"
extern "C"{
#include "./../../libc/include/string.h"
}
void kterm_init();
/* Kernel terminal - Colour functions*/
void kterm_resetcolor();
void kterm_setcolor(uint8_t);
/* Kernel terminal - Printing function */
void kterm_putat(char, uint8_t, size_t, size_t);
void kterm_put(char);
void kterm_write(const char*, size_t);
@ -25,17 +18,9 @@ void kterm_writestring(const char*);
void kterm_scrollup();
/* Kernel terminal - Cursor functions */
void enable_cursor (uint8_t start_cursor , uint8_t end_cursor );
void disable_cursor();
void update_cursor(int x, int y);
uint16_t get_cursor_position();
int get_cursor_x (uint16_t cursor_pos);
int get_cursor_y (uint16_t cursor_pos);
extern "C" void itoa (char *buf, int base, int d);
void printf ( const char *format, ...);
static void itoa (char *buf, int base, int d);
#define KernelTag "[Kernel]: "
#define AS_KERNEL() ( kterm_setcolor(VGA_COLOR_LIGHT_BLUE),\

0
src/kernel/vga/colors.h → src/kernel/arch/i386/vga/colors.h
View File

87
src/kernel/boot.S
View File

@ -1,87 +0,0 @@
/*
* Multiboot
*/
.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
.set MEMINFO, 1<<1 /* provide memory map */
.set VIDEO, 1<<2 /* provide video mode */
.set FLAGS, ALIGN | MEMINFO | VIDEO /* this is the Multiboot 'flag' field */
.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
.section .multiboot
.align 4
.long MAGIC
.long FLAGS
.long CHECKSUM
.long 0 # unused
.long 0 # .
.long 0 # .
.long 0 # .
.long 0 # unused
.long 0 # set graphics mode
.long 800 # screen witdh
.long 600 # screen height
.long 32 # bpp
.section .bss
.align 16
stack_bottom:
.skip 16384 # 16 KiB
stack_top:
.section .text
.include "./src/kernel/irs_table.s"
.include "./src/kernel/irq_table.s"
.include "./src/kernel/idt/idt.s"
.include "./src/kernel/paging.s"
.global _start
.type _start, @function
_start:
/*Setup the stack pointer to point to the beginning of our stack */
/* I believe its a high address growing down to lower adress for the stack on x86*/
mov $stack_top, %esp
/*Reset EFLAGS*/
pushl $0
popf
/* push the pointer to the Multiboot information structure*/
pushl %ebx
/* push the magic value */
pushl %eax
call early_main
cli
.include "./src/kernel/gdt/gdt.s"
loadIDT:
#load idt
call init_idt
sti
# Try enable A20
# mov $0x2401, %ax
# int $0x15
# enable protected mode
mov %cr0, %eax
or $1, %eax
mov %eax, %cr0
call kernel_main
cli
1: hlt
jmp 1b
.size _start, . - _start

108
src/kernel/bootcheck.h
View File

@ -1,108 +0,0 @@
#pragma once
#include "bootloader/multiboot.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
#include "../gui/window.h"
#include "../gui/cursor.h"
#include "tty/kterm.h"
#include "drivers/vesa/vesa.h"
void CheckMBT ( multiboot_info_t* mbt ){
/* Set MBI to the addresss of the multiboot information structure*/
multiboot_info_t * mbi = (multiboot_info_t *) mbt;
/* Print out the flags */
printf("flags = 0x%8x\n", (unsigned) mbi->flags);
/* Are mem_* valid? */
if ( CHECK_FLAG(mbi->flags,0)){
printf("mem_lower = %uKB, mem_upper = %uKB\n");
}
/* is boot device valid ? */
if (CHECK_FLAG (mbi->flags, 1)){
printf("boot_device = 0x0%x\n", (unsigned) mbi->boot_device);
}
/* is the command line passed? */
if (CHECK_FLAG ( mbi->flags,2)){
printf("cmdline = %s\n", (char *) mbi->cmdline);
}
/* Are mods_* valid? */
if(CHECK_FLAG ( mbi->flags, 3)){
multiboot_module_t *mod;
uint32_t i;
printf("mods count = %d, mods_addr = 0x%x\n", (int) mbi->mods_count, (int) mbi->mods_addr);
for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
printf(" mod start = 0x%x, mod_end = 0x%x, cmdline = %s\n", (unsigned) mod->mod_start, (unsigned) mod->mod_end, (char*) mod->cmdline);
}
}
/* Bits 4 and 5 are mutually exclusive! */
if (CHECK_FLAG (mbi->flags, 4) && CHECK_FLAG(mbi->flags, 5)){
printf("Both bits 4 and 5 are set.\n");
return;
}
/* Is the symbol table of a.out valid? */
if (CHECK_FLAG(mbi->flags, 4)){
multiboot_aout_symbol_table_t *multiboot_aout_sym = &(mbi->u.aout_sym);
printf( "multiboot_aout_symbol_table: tabsize = 0x%0x, strsize = 0x%x, addr = 0x%x\n",
(unsigned) multiboot_aout_sym->tabsize,
(unsigned) multiboot_aout_sym->strsize,
(unsigned) multiboot_aout_sym->addr);
}
/* Is the section header table of ELF valid? */
if (CHECK_FLAG(mbi->flags, 5)){
multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
printf("multiboot_elf_sec: num = %u, size = 0x%x, addr = 0x%x, shnd = 0x%x\n",
(unsigned) multiboot_elf_sec->num, (unsigned) multiboot_elf_sec->size,
(unsigned) multiboot_elf_sec->addr, (unsigned) multiboot_elf_sec->shndx);
}
/* Draw diagonal blue line */
if (CHECK_FLAG (mbt->flags, 11)){
printf("Can draw!");
// Init vesa driver
initVBEDevice(mbt);
// Fill screen with blue
// colours AARRGGBB
drawRect(0, 0 , VbeModeInfo->width,VbeModeInfo->height, 0xFF0000FF);
// Create two windows
Rect rect_window1 {};
Rect rect_window2 {};
rect_window1.height =200;
rect_window1.width = 300;
rect_window1.x = 50;
rect_window1.y = 50;
rect_window2.height =200;
rect_window2.width = 300;
rect_window2.x = 300;
rect_window2.y = 200;
Window window_1 ( rect_window1, 0xFF00F0FF);
Window window_2 (rect_window2, 0xFFAACCDD);
window_1.draw();
window_2.draw();
Cursor cursor (70,100);
cursor.draw();
}
}

17
src/kernel/cpu.h
View File

@ -1,17 +0,0 @@
#include <cpuid.h> // NOTE: Only available in GCC
// NOT currently usefull!
/* static int get_model(){
int ebx, unused;
__cpuid(0, unused, ebx, unused, unused);
return ebx;
}
enum {
CPUID_FEAT_EDX_APIC = 1 << 9
};
static int check_apic (){
unsigned int eax, unused, edx;
__get_cpuid(1, &eax, &unused, &unused, &edx);
return edx & CPUID_FEAT_EDX_APIC;
}
*/

17
src/kernel/disk.h
View File

@ -1,17 +0,0 @@
#pragma once
// Let's write an ATA PIO | ATA driver for now. Mostly to show that I can in theory interact with a
// storage device
// PRIMARY_ATA_BUS
// 0x1F0 through 0x1F7
// SECONDARY_ATA_BUS
// 0x170 through 0x177
#define DEVICE_CONTROL_REGISTER 0x3F6
#define DEVICE_CONTROL_ALTERNATE 0x376
// IRQ14 Primary bus interrupt
// IRQ15 Secondary bus interrupt

136
src/kernel/drivers/vesa/vesa.cpp
View File

@ -1,136 +0,0 @@
#include "vesa.h"
VbeInfoBlock* vbeInfo;
vbe_mode_info_structure* VbeModeInfo;
void initVBEDevice(multiboot_info_t* mbt){
print_serial("initVBEDevice");
vbeInfo = (VbeInfoBlock*) mbt->vbe_control_info;
printf_serial("Signature: %s, V0x%x\n", vbeInfo->VbeSignature, vbeInfo->VbeVersion);
VbeModeInfo = (vbe_mode_info_structure*) mbt->vbe_mode_info;
printf_serial("VESA video mode info: Width: %d Height: %d BPP: %d\n", VbeModeInfo->width, VbeModeInfo->height , VbeModeInfo->bpp);
printf_serial("VideoMemory Location: 0x%x \n", VbeModeInfo->framebuffer );
}
void putPixel( int x, int y , uint32_t colour){
// printf_serial("putPixel x: %d, y: %d\n", x, y);
///fb + mbt->framebuffer_pitch * y + 4 * x ,NOTE: this calculation is very important
*(uint32_t*) ( VbeModeInfo->framebuffer + VbeModeInfo->pitch * y + 4 * x ) = colour;
}
void drawLine(int x1, int y1, int x2, int y2, uint32_t colour ){
print_serial("drawline\n");
// See Bresenham's line algorithm
int deltaX = x2 - x1;
int deltaY = y2 - y1;
int D = 2 * deltaY - deltaX;
int y = y1;
for ( int x = x1; x < x2; x++){
putPixel(x,y, colour);
if( D > 0){
y +=1;
D = D - 2 * deltaX;
}
D = D + 2 * deltaY;
}
}
void drawRect ( int x, int y, int width, int height, uint32_t colour ){
print_serial("drawRect\n");
for ( int i = x; i < x + width; i ++)
{
for(int j = y; j < y + height; j++){
putPixel(i,j, colour);
}
}
}
void blueDiagnalLineTest(multiboot_info_t* mbt){
multiboot_uint32_t color;
unsigned i;
void *fb = (void *) (unsigned long) mbt->framebuffer_addr;
switch (mbt->framebuffer_type)
{
case MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED:
{
unsigned best_distance, distance;
struct multiboot_color *palette;
palette = (struct multiboot_color *) mbt->framebuffer_palette_addr;
color = 0;
best_distance = 4*256*256;
for (i = 0; i < mbt->framebuffer_palette_num_colors; i++)
{
distance = (0xff - palette[i].blue) * (0xff - palette[i].blue)
+ palette[i].red * palette[i].red
+ palette[i].green * palette[i].green;
if (distance < best_distance)
{
color = i;
best_distance = distance;
}
}
}
break;
case MULTIBOOT_FRAMEBUFFER_TYPE_RGB:
color = ((1 << mbt->framebuffer_blue_mask_size) - 1)
<< mbt->framebuffer_blue_field_position;
break;
case MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT:
color = '\\' | 0x0100;
break;
default:
color = 0xffffffff;
break;
}
for (i = 0; i < mbt->framebuffer_width
&& i < mbt->framebuffer_height; i++)
{
switch (mbt->framebuffer_bpp)
{
case 8:
{
multiboot_uint8_t *pixel = (multiboot_uint8_t*)fb + mbt->framebuffer_pitch * i + i;
*pixel = color;
}
break;
case 15:
case 16:
{
multiboot_uint16_t *pixel
= (multiboot_uint16_t*)fb + mbt->framebuffer_pitch * i + 2 * i;
*pixel = color;
}
break;
case 24:
{
multiboot_uint32_t *pixel
= (multiboot_uint32_t*)fb + mbt->framebuffer_pitch * i + 3 * i;
*pixel = (color & 0xffffff) | (*pixel & 0xff000000);
}
break;
case 32:
{
multiboot_uint32_t *pixel
= (multiboot_uint32_t*)fb + mbt->framebuffer_pitch * i + 4 * i;
*pixel = color;
}
break;
}
}
}

66
src/kernel/drivers/vesa/vesa.h
View File

@ -1,66 +0,0 @@
#pragma once
#include <stdint.h>
#include "../../bootloader/multiboot.h"
#include "../../serial.h"
struct vbe_mode_info_structure{
uint16_t attributes;
uint8_t window_a;
uint8_t window_b;
uint16_t granularity;
uint16_t window_size;
uint16_t segment_a;
uint16_t segment_b;
uint32_t win_func_ptr;
uint16_t pitch;
uint16_t width;
uint16_t height;
uint8_t w_char;
uint8_t y_char;
uint8_t planes;
uint8_t bpp;
uint8_t banks;
uint8_t memory_model;
uint8_t bank_size;
uint8_t image_pages;
uint8_t reserved0;
uint8_t red_mask;
uint8_t red_position;
uint8_t green_mask;
uint8_t green_position;
uint8_t blue_mask;
uint8_t blue_position;
uint8_t reserved_mask;
uint8_t reserved_position;
uint8_t direct_color_attributes;
uint32_t framebuffer;
uint32_t off_screen_mem_off;
uint16_t off_screen_mem_size;
uint8_t reserved1[206];
}__attribute__((packed));
struct VbeInfoBlock {
char VbeSignature[4];
uint16_t VbeVersion;
uint16_t OemStringPtr;
uint8_t Capabilities;
uint16_t VideoModePtr;
uint16_t TotalMemory;
}__attribute__((packed));
extern VbeInfoBlock* vbeInfo;
extern vbe_mode_info_structure* VbeModeInfo;
void initVBEDevice(multiboot_info_t* mbt);
void blueDiagnalLineTest(multiboot_info_t* mbt);
// Primitive drawing functions
void putPixel( int x, int y , uint32_t colour);
void drawLine(int x1, int y1, int x2, int y2, uint32_t colour );
void drawRect ( int x, int y, int width, int height, uint32_t colour );

19
src/kernel/gdt/gdt.s
View File

@ -1,19 +0,0 @@
.global LoadGlobalDescriptorTable
LoadGlobalDescriptorTable:
lgdt gdtDescriptor
movw $16, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movw %ax, %ss
jmp $8,$flush
flush:
ret

62
src/kernel/gdt/gdtc.cpp
View File

@ -1,62 +0,0 @@
#include "gdtc.h"
#include "../tty/kterm.h"
#define NULL_SEGMENT 0
#define KERNEL_CODE_SEGMENT 1
#define KERNEL_DATA_SEGMENT 2
#define USER_CODE_SEGMENT 3
#define USER_DATA_SEGMENT 4
SegmentDescriptor GlobalDescriptorTable[5];
GlobalDescriptorTableDescriptor gdtDescriptor;
void add_descriptor(int which , unsigned long base, unsigned long limit, unsigned char access, unsigned char granularity ){
GlobalDescriptorTable[which].base_low = (base & 0xFFFF );
GlobalDescriptorTable[which].base_middle = (base >> 6) & 0xFF;
GlobalDescriptorTable[which].base_high = (base >> 24) & 0xFF;
GlobalDescriptorTable[which].limit_low = (limit & 0xFFFF);
GlobalDescriptorTable[which].granularity = ((limit >> 16) & 0x0F);
GlobalDescriptorTable[which].granularity |= (granularity & 0xF0);
GlobalDescriptorTable[which].access = access;
}
void initGDT(){
// NULL segment
add_descriptor(NULL_SEGMENT, 0,0,0,0);
// Kernel Code Segment
add_descriptor(KERNEL_CODE_SEGMENT, 0, 0xFFFFFFFF, 0x9A, 0xCF);
// Kernel Data Segment
add_descriptor(KERNEL_DATA_SEGMENT, 0, 0xFFFFFFFF, 0x92, 0xCF);
// User Code Segment
// TODO:
// User Data Segement
// TODO:
// init Gdt Descriptor
gdtDescriptor.limit = ((sizeof(SegmentDescriptor ) * 5 ) - 1);
gdtDescriptor.base = (unsigned int) &GlobalDescriptorTable;
printf("Hello GDT!\n");
LoadGlobalDescriptorTable();
// while (true)
// asm volatile("hlt");
}

27
src/kernel/gdt/gdtc.h
View File

@ -1,27 +0,0 @@
#include <stdint.h>
struct SegmentDescriptor {
unsigned short limit_low;
unsigned short base_low;
unsigned char base_middle;
unsigned char access;
unsigned char granularity;
unsigned char base_high;
}__attribute__((packed));
struct GlobalDescriptorTableDescriptor{
unsigned short limit;
unsigned int base;
}__attribute__((packed));
extern SegmentDescriptor GlobalDescriptorTable[];
extern GlobalDescriptorTableDescriptor gdtDescriptor;
void add_descriptor(int which , unsigned long base, unsigned long limit, unsigned char access, unsigned char granularity );
extern "C" void LoadGlobalDescriptorTable();
void initGDT();

6
src/kernel/idt/idt.s
View File

@ -1,6 +0,0 @@
.globl idt_flush
idt_flush:
mov 4(%esp), %eax
lidt (%eax)
ret

15
src/kernel/io.cpp
View File

@ -1,24 +1,19 @@
#include "io.h"
unsigned char inb_p(unsigned short ){
// TODO: implement me!
return 0;
}
unsigned short inw(unsigned short ){
// TODO: implement me!
return 0;
}
unsigned short inw_p(unsigned short ){
// TODO: implement me!
return 0;
}
unsigned int inl(unsigned short ){
// TODO: implement me!
return 0;
}
unsigned int inl_p(unsigned short ){
// TODO: implement me!
return 0;
}

138
src/kernel/irq_table.s
View File

@ -1,138 +0,0 @@
.globl irq0
irq0:
cli
push $0
push $0
jmp irq_common
.globl irq1
irq1:
cli
push $0
push $1
jmp irq_common
.globl irq2
irq2:
cli
push $0
push $2
jmp irq_common
.globl irq3
irq3:
cli
push $0
push $3
jmp irq_common
.globl irq4
irq4:
cli
push $0
push $4
jmp irq_common
.globl irq5
irq5:
cli
push $0
push $5
jmp irq_common
.globl irq6
irq6:
cli
push $0
push $6
jmp irq_common
.globl irq7
irq7:
cli
push $0
push $7
jmp irq_common
.globl irq8
irq8:
cli
push $0
push $8
jmp irq_common
.globl irq9
irq9:
cli
push $0
push $9
jmp irq_common
.globl irq10
irq10:
cli
push $0
push $10
jmp irq_common
.globl irq11
irq11:
cli
push $0
push $11
jmp irq_common
.globl irq12
irq12:
cli
push $0
push $12
jmp irq_common
.globl irq13
irq13:
cli
push $0
push $13
jmp irq_common
.globl irq14
irq14:
cli
push $0
push $14
jmp irq_common
.globl irq15
irq15:
cli
push $0
push $15
jmp irq_common
irq_common:
pusha
mov %ds, %ax
push %eax
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
call irq_handler
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp # cleans push error and irs code
sti
iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP

256
src/kernel/irs_table.s
View File

@ -1,256 +0,0 @@
/*
* Interupt handlers
*/
.globl irs0
irs0:
cli
push $0
push $0
jmp irs_common
.globl irs1
irs1:
cli
push $0
push $1
jmp irs_common
.globl irs2
irs2:
cli
push $0
push $2
jmp irs_common
.globl irs3
irs3:
cli
push $0
push $3
jmp irs_common
.globl irs4
irs4:
cli
push $0
push $4
jmp irs_common
.globl irs5
irs5:
cli
push $0
push $5
jmp irs_common
.globl irs6
irs6:
cli
push $0
push $6
jmp irs_common
.globl irs7
irs7:
cli
push $0
push $7
jmp irs_common
.globl irs8
irs8:
cli
push $0
push $8
jmp irs_common
.globl irs9
irs9:
cli
push $0
push $9
jmp irs_common
.globl irs10
irs10:
cli
push $0
push $10
jmp irs_common
.globl irs11
irs11:
cli
push $0
push $11
jmp irs_common
.globl irs12
irs12:
cli
push $0
push $12
jmp irs_common
.globl irs13
irs13:
cli
push $13
jmp irs_common
.globl irs14
irs14:
cli
push $0
push $14
jmp irs_common
.globl irs15
irs15:
cli
push $0
push $15
jmp irs_common
.globl irs16
irs16:
cli
push $0
push $16
jmp irs_common
.globl irs17
irs17:
cli
push $0
push $17
jmp irs_common
.globl irs18
irs18:
cli
push $0
push $18
jmp irs_common
.globl irs19
irs19:
cli
push $0
push $19
jmp irs_common
.globl irs20
irs20:
cli
push $0
push $20
jmp irs_common
.globl irs21
irs21:
cli
push $0
push $21
jmp irs_common
.globl irs22
irs22:
cli
push $0
push $22
jmp irs_common
.globl irs23
irs23:
cli
push $0
push $23
jmp irs_common
.globl irs24
irs24:
cli
push $0
push $24
jmp irs_common
.globl irs25
irs25:
cli
push $0
push $25
jmp irs_common
.globl irs26
irs26:
cli
push $0
push $26
jmp irs_common
.globl irs27
irs27:
cli
push $0
push $27
jmp irs_common
.globl irs28
irs28:
cli
push $0
push $28
jmp irs_common
.globl irs29
irs29:
cli
push $0
push $29
jmp irs_common
.globl irs30
irs30:
cli
push $0
push $30
jmp irs_common
.globl irs31
irs31:
cli
push $0
push $31
jmp irs_common
irs_common:
pusha # Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
mov %ds, %ax
push %eax
/* load the kernel data segment descriptor*/
mov $0x10, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
call irs_handler
pop %eax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
popa
add $8, %esp # cleans push error and irs code
sti
iret # pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP

245
src/kernel/kernel.cpp
View File

@ -1,60 +1,245 @@
#include "kernel.h"
#define GB4 524288
#define GB2 262144
extern "C" void kernel_main (void);
extern "C" void putPixel(int pos_x, int pos_y, unsigned char VGA_COLOR , unsigned char addr , unsigned char pixelWidth, unsigned pitch );
/**
* simple delay function
**/
void delay(int t){
volatile int i,j;
for(i=0;i<t;i++)
for(j=0;j<25000;j++)
asm("NOP");
}
class Test {
public:
Test();
void printMe();
~Test();
};
Test::Test(){
kterm_writestring("Create a test object\n");
};
void Test::printMe(){
kterm_writestring("testObject.printMe()\n");
}
Test::~Test(){
kterm_writestring("Destroy testObject! Bye bye\n");
}
#define PORT 0x3f8
static int init_serial() {
outb(PORT + 1, 0x00); // Disable all interrupts
outb(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
outb(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
outb(PORT + 1, 0x00); // (hi byte)
outb(PORT + 3, 0x03); // 8 bits, no parity, one stop bit
outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
outb(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
outb(PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
// Check if serial is faulty (i.e: not same byte as sent)
if(inb(PORT + 0) != 0xAE) {
return 1;
}
// If serial is not faulty set it in normal operation mode
// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
outb(PORT + 4, 0x0F);
return 0;
}
int is_transmit_empty() {
return inb(PORT + 5) & 0x20;
}
void write_serial(char a) {
while (is_transmit_empty() == 0);
outb(PORT,a);
}
int serial_received() {
return inb(PORT + 5) & 1;
}
char read_serial() {
while (serial_received() == 0);
return inb(PORT);
}
void print_serial(const char* string ){
for(size_t i = 0; i < strlen(string); i ++){
write_serial(string[i]);
}
}
void test_serial(){
/** Serial test **/
kterm_writestring("Writing to COM1 serial port:");
init_serial();
write_serial('A');
write_serial('B');
write_serial('C');
write_serial('D');
write_serial('E');
char Character_received = read_serial();
kterm_writestring("\n");
kterm_writestring("received from COM 1: \n");
kterm_put(Character_received);
kterm_writestring("\n");
}
extern "C" {
void early_main(unsigned long magic, unsigned long addr){
extern "C" void early_main(unsigned long magic, unsigned long addr){
/** initialize terminal interface */
// kterm_init();
printf("Magic flag 0x%8x\n", magic);
printf("Magic must be 0x%8x\n", MULTIBOOT_BOOTLOADER_MAGIC);
kterm_init();
multiboot_info_t *mbi;
if (magic != MULTIBOOT_BOOTLOADER_MAGIC){
printf("Invalid magic number: 0x%8x\n", magic);
printf("Invalid magic number: 0x%x\n", (unsigned) magic);
return;
}
CheckMBT( (multiboot_info_t *) addr);
/* Set MBI to the addresss of the multiboot information structure*/
mbi = (multiboot_info_t *) addr;
multiboot_info_t* mbt = (multiboot_info_t*) addr;
/* Print out the flags */
printf("flags = 0x%x\n", (unsigned) mbi->flags);
/* Are mmap_* valid? */
if (CHECK_FLAG(mbt->flags, 6)){
PhysicalMemoryManager_initialise( mbt->mmap_addr, GB2/* Seriously dangerous hardcoded memory value*/);
PhysicalMemoryManager_initialise_available_regions(mbt->mmap_addr, mbt->mmap_addr + mbt->mmap_length);
PhysicalMemoryManager_deinitialise_kernel();
extern uint8_t* kernel_begin;
extern uint8_t* kernel_end;
printf("Kernel MemoryMap:\n");
printf("kernel: 0x%x - 0x%x\n", &kernel_begin , &kernel_end);
/* Are mem_* valid? */
if ( CHECK_FLAG(mbi->flags,0)){
printf("mem_lower = %uKB, mem_upper = %uKB\n");
}
initGDT();
/* is boot device valid ? */
if (CHECK_FLAG (mbi->flags, 1)){
printf("boot_device = 0x0%x\n", (unsigned) mbi->boot_device);
}
/* is the command line passed? */
if (CHECK_FLAG ( mbi->flags,2)){
printf("cmdline = %s\n", (char *) mbi->cmdline);
}
/* Are mods_* valid? */
if(CHECK_FLAG ( mbi->flags, 3)){
multiboot_module_t *mod;
int i;
printf("mods count = %d, mods_addr = 0x%x\n", (int) mbi->mods_count, (int) mbi->mods_addr);
for(i = 0, mod = (multiboot_module_t *) mbi->mods_addr; i < mbi->mods_count; i++ , mod++){
printf(" mod start = 0x%x, mod_end = 0x%x, cmdline = %s\n", (unsigned) mod->mod_start, (unsigned) mod->mod_end, (char*) mod->cmdline);
}
}
/* Bits 4 and 5 are mutually exclusive! */
if (CHECK_FLAG (mbi->flags, 4) && CHECK_FLAG(mbi->flags, 5)){
printf("Both bits 4 and 5 are set.\n");
return;
}
/* Is the symbol table of a.out valid? */
if (CHECK_FLAG(mbi->flags, 4)){
multiboot_aout_symbol_table_t *multiboot_aout_sym = &(mbi->u.aout_sym);
printf( "multiboot_aout_symbol_table: tabsize = 0x%0x, strsize = 0x%x, addr = 0x%x\n",
(unsigned) multiboot_aout_sym->tabsize,
(unsigned) multiboot_aout_sym->strsize,
(unsigned) multiboot_aout_sym->addr);
}
/* Is the section header table of ELF valid? */
if (CHECK_FLAG(mbi->flags, 5)){
multiboot_elf_section_header_table_t *multiboot_elf_sec = &(mbi->u.elf_sec);
printf("multiboot_elf_sec: num = %u, size = 0x%x, addr = 0x%x, shnd = 0x%x\n",
(unsigned) multiboot_elf_sec->num, (unsigned) multiboot_elf_sec->size,
(unsigned) multiboot_elf_sec->addr, (unsigned) multiboot_elf_sec->shndx);
}
kernel_main();
// AAAAAH memory map, Yes please!
/* Are mmap_* valid? */
if (CHECK_FLAG(mbi->flags, 6)){
multiboot_memory_map_t *mmap;
printf("mmap_addr = 0x%x, mmap_length = 0x%x\n",
(unsigned) mbi->mmap_addr, (unsigned) mbi->mmap_length);
for (mmap = (multiboot_memory_map_t *) mbi->mmap_addr;
(unsigned long) mmap < mbi->mmap_addr + mbi->mmap_length;
mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
printf(
"size = 0x%x, base_addr = 0x%x%08x, length = 0x%x%08x, type = 0x%x\n",
(unsigned) mmap->size,
(unsigned) (mmap->addr >> 32),
(unsigned) (mmap->addr & 0xffffffff),
(unsigned) (mmap->len >> 32),
(unsigned) (mmap->len & 0xffffffff),
(unsigned) mmap->type);
}
}
/* Draw diagonal blue line */
if (CHECK_FLAG (mbi->flags, 12)){
printf("Can draw!");
}
}
extern "C" void kernel_main (void) {
void kernel_main (void) {
printf("call to init serial\n");
init_serial();
/** Setup the MMU **/
//kterm_writestring("Starting MMU...\n");
//auto mmu = MMU();
//mmu.enable();
//kterm_writestring("MMU enabled!\n");
/** test interrupt handlers **/
//asm volatile ("int $0x03");
//asm volatile ("int $0x04");
while (true){
//Read time indefinetely
read_rtc();
printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
delay(1000);
}
}
/** Lets start using the serial port for debugging .. **/
// Hopefully once we go into realmode or do something that
// cause the screen to go black.. this serial comms part will give
// some situational awareness
//Serial serialbus = Serial::init();
}
}

35
src/kernel/kernel.h
View File

@ -1,33 +1,14 @@
#pragma once
extern "C"{
#include "../libc/include/string.h"
#pragma once
extern "C" {
#include "../libc/include/string.h"
#include "arch/i386/tty/kterm.h"
}
#include "vga/VBE.h"
#include "tty/kterm.h"
#include "./bootloader/multiboot.h"
#include "bootcheck.h"
#include "memory/PhysicalMemoryManager.h"
#include "gdt/gdtc.h"
#include "idt/idt.h"
#include "multiboot.h"
#include "arch/i386/idt/idt.h"
#include "MMU.h"
#include "io.h"
#include "time.h"
#include "cpu.h"
#include "serial.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
#define PANIC(message) { return; }
/* This needs to be moved! */
/**
* simple delay function
**/
void delay(int t){
volatile int i,j;
for(i=0;i<t;i++)
for(j=0;j<25000;j++)
asm("NOP");
}
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))

40
src/kernel/kstructures/bitmap.h
View File

@ -1,40 +0,0 @@
#pragma once
#include <stddef.h>
#include <stdint.h>
inline void bitmap_set( uint32_t* map , int index )
{
map[index/32] |= (1 << (index % 32));
}
inline void bitmap_unset(uint32_t* map , int index)
{
map[index/32] &= ~(1 << (index % 32));
}
inline int bitmap_first_unset( uint32_t* map , int size)
{
uint32_t rem_bits = size % 32;
for(uint32_t i = 0; i < size/32; i++)
{
if(map[i] != 0xFFFFFFFF){
for(int j = 0; j < 32; j++){
if(!(map[i] & (1<< j))){
return (i*32) + j;
}
}
}
}
if(rem_bits){
for(uint32_t j = 0; j < rem_bits; j++){
if(!(map[size/32] & (1 << j ))){
return size + j; // Original author divided size by 32 and then multiplied it by 32 which is a net zero calculation ?!?
}
}
}
return -1;
}

28
src/kernel/memory/PageDirectory.h
View File

@ -1,28 +0,0 @@
#pragma once
#include <stdint.h>
extern "C" void loadPageDirectory (uint32_t* addr );
extern "C" void enablePaging();
typedef uintptr_t address_t;
#define KB 1024
static const int MAX_PAGES = 1024 * KB; // 4GB , 4kB/page
static volatile address_t pmem_stack[MAX_PAGES];
static volatile address_t pmem_stack_top = MAX_PAGES; // top down allocation
struct page_directory_entry {};
struct page_table_entry{};
class PageDirectory {
public:
void enable ();
private:
uint32_t page_directory[1024] __attribute__((aligned(4096)));
uint32_t first_page_table[1024] __attribute__((aligned(4096)));
};

38
src/kernel/memory/PageFrameAllocator.cpp
View File

@ -1,38 +0,0 @@
#include "PageFrameAllocator.h"
MemoryInfo memInfo {};
void mapMultibootMemoryMap( multiboot_info_t *mbt){
printf("mmap_addr = 0x%x, mmap_length = 0x%x\n",
(unsigned) mbt->mmap_addr, (unsigned) mbt->mmap_length);
multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) mbt->mmap_addr;
for (; (unsigned long) mmap < mbt->mmap_addr + mbt->mmap_length; mmap = (multiboot_memory_map_t *) ((unsigned long) mmap + mmap->size + sizeof(mmap->size))){
if ( mmap->type == MULTIBOOT_MEMORY_AVAILABLE){
memInfo.memorySizeInBytes += mmap->len;
} else {
memInfo.reservedMemoryInBytes += mmap->len;
}
print_Multiboot_memory_Map(mmap);
}
uint32_t memorySizeInGiB = memInfo.memorySizeInBytes / 1073741824;
printf("Available Memory: 0x%x bytes, 0x%x GiB\n", memInfo.memorySizeInBytes, memorySizeInGiB );
printf("Reserved Memory: 0x%x bytes\n", memInfo.reservedMemoryInBytes );
}
void print_Multiboot_memory_Map(multiboot_memory_map_t* mmap){
printf(
"size = 0x%x, base_addr = 0x%x%08x, length = 0x%x%08x, type = 0x%x\n",
(unsigned) mmap->size,
(unsigned) (mmap->addr >> 32),
(unsigned) (mmap->addr & 0xffffffff),
(unsigned) (mmap->len >> 32),
(unsigned) (mmap->len & 0xffffffff),
(unsigned) mmap->type
);
}

20
src/kernel/memory/PageFrameAllocator.h
View File

@ -1,20 +0,0 @@
#pragma once
#include "../arch/i386/tty/kterm.h"
#include <stdint.h>
#include "../bootloader/multiboot.h"
struct MemoryInfo{
uint32_t memorySizeInBytes = 0;
uint32_t reservedMemoryInBytes = 0;
};
extern void *kernel_begin;
extern void *kernel_end;
void print_Multiboot_memory_Map(multiboot_memory_map_t*);
void mapMultibootMemoryMap(multiboot_info_t*);

118
src/kernel/memory/PhysicalMemoryManager.cpp
View File

@ -1,118 +0,0 @@
#include "PhysicalMemoryManager.h"
size_t mem_size = 0;
int used_blocks = 0;
size_t max_blocks = 0;
uint32_t* pmmap = 0;
size_t pmmap_size = 0;
void PhysicalMemoryManager_initialise(uint32_t physicalmemorymap_address, size_t size )
{
mem_size = size;
max_blocks = KB_TO_BLOCKS(mem_size);
used_blocks = max_blocks;
pmmap = (uint32_t*) physicalmemorymap_address;
if(max_blocks % BLOCKS_PER_WORD)
pmmap_size++;
memset(pmmap, 0xFF, pmmap_size);
}
void PhysicalMemoryManager_region_initialise(uint32_t base, size_t size)
{
size_t blocks = size /BLOCK_SIZE;
uint32_t align = base / BLOCK_SIZE;
for(size_t i = 0 ; i < blocks; i ++)
{
bitmap_unset(pmmap, align++);
used_blocks--;
}
bitmap_set(pmmap, 0);
}
void PhysicalMemoryManager_region_deinitialise(uint32_t base, size_t size )
{
size_t blocks = size / BLOCK_SIZE;
uint32_t align = base / BLOCK_SIZE;
for(size_t i = 0 ; i < blocks; i++ )
{
bitmap_set(pmmap, align++);
used_blocks++;
}
}
void PhysicalMemoryManager_initialise_available_regions(uint32_t mmap_, uint32_t mmap_end_)
{
multiboot_memory_map_t *mmap = (multiboot_memory_map_t*)mmap_;
multiboot_memory_map_t *mmap_end= (multiboot_memory_map_t*) mmap_end_;
for(int i = 0; mmap < mmap_end ; mmap++, i++)
{
if(mmap->type == MULTIBOOT_MEMORY_AVAILABLE)
{
PhysicalMemoryManager_region_initialise((uint32_t) mmap->addr, (size_t) mmap->len);
}
}
}
void PhysicalMemoryManager_deinitialise_kernel()
{
extern uint8_t kernel_begin;
extern uint8_t kernel_end;
size_t kernel_size = (size_t) &kernel_end - (size_t) &kernel_begin;
uint32_t pmmap_size_aligned = pmmap_size;
if(!IS_ALIGNED(pmmap_size_aligned, BLOCK_SIZE))
{
pmmap_size_aligned = ALIGN(pmmap_size_aligned, BLOCK_SIZE);
}
PhysicalMemoryManager_region_deinitialise((uint32_t) &kernel_begin, kernel_size);
PhysicalMemoryManager_region_deinitialise((uint32_t) &kernel_end, pmmap_size_aligned);
}
void* PhysicalMemoryManager_allocate_block()
{
if(used_blocks - max_blocks <= 0)
{
return 0;
}
int p_index = bitmap_first_unset(pmmap, p_index );
if(p_index == -1){
return 0;
}
bitmap_set(pmmap, p_index);
used_blocks++;
return (void*) (BLOCK_SIZE * p_index);
}
void PhysicalMemoryManager_free_block(void* p){
if(p==0){
return ;
}
uint32_t p_addr = (uint32_t) p;
int index = p_addr / BLOCK_SIZE;
bitmap_unset(pmmap, index);
used_blocks--;
}

34
src/kernel/memory/PhysicalMemoryManager.h
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@ -1,34 +0,0 @@
#pragma once
#include "../bootloader/multiboot.h"
#include <stdint.h>
#include <stddef.h>
#include "../../libc/include/mem.h"
#include "../kstructures/bitmap.h"
#define BLOCK_SIZE 4092
#define BLOCKS_PER_WORD 32
#define KB_TO_BLOCKS(x) (((x) * 1024 ) / BLOCK_SIZE)
#define IS_ALIGNED(addr, align) !((addr) & ~((align) - 1))
#define ALIGN(addr, align) (((addr) & ~((align) - 1 )) + (align))
extern void PhysicalMemoryManager_initialise(uint32_t, size_t);
extern void PhysicalMemoryManager_region_initialise(uint32_t, size_t);
extern void PhysicalMemoryManager_region_deinitialise(uint32_t,size_t);
extern void PhysicalMemoryManager_initialise_available_regions(uint32_t, uint32_t);
extern void PhysicalMemoryManager_deinitialise_kernel();
extern void* PhysicalMemoryManager_allocate_block();
extern void PhysicalMemoryManager_free_block(void* p);
extern size_t mem_size;
extern int used_blocks;
extern size_t max_blocks;
extern uint32_t* pmmap;
extern size_t pmmap_size ;

0
src/kernel/bootloader/multiboot.h → src/kernel/multiboot.h
View File

20
src/kernel/paging.s
View File

@ -1,20 +0,0 @@
.globl enablePaging
enablePaging:
push %ebp
mov %esp, %ebp
mov %cr0, %eax
or $0x80000000, %eax
mov %eax, %cr0
mov %ebp, %esp
pop %ebp
ret
.globl loadPageDirectory
loadPageDirectory:
push %ebp
mov %esp, %ebp
mov 8(%esp), %eax
mov %eax, %cr3
mov %ebp, %esp
pop %ebp
ret

108
src/kernel/pci.cpp
View File

@ -1,108 +0,0 @@
#include "pci.h"
uint16_t ConfigReadWord (uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset){
uint32_t address;
uint32_t lbus = (uint32_t) bus;
uint32_t lslot = (uint32_t) slot;
uint32_t lfunc = (uint32_t) func;
uint16_t tmp = 0;
/* Create configuration address as per Figure 1 */
address = (uint32_t) ((lbus << 16) | (lslot << 11) | (lfunc << 8) | (offset & 0xFC) |((uint32_t) 0x80000000) );
/*write out the address */
outl(CONFIG_ADDRESS, address);
/* read in the data */
/* (offset & 2 ) * 8 ) = o will choosse the first word of the 32 bits register*/
tmp = (uint16_t)((inl(CONFIG_DATA)) >> ((offset & 2) * 8) & 0xFFFF);
return (tmp);
}
uint16_t CheckVendor (uint8_t bus, uint8_t slot) {
uint16_t vendor, device;
/*
Try and read the first configuration register. Since there ar no
vendors that == 0xFFFF, it must be a non-existent device.
*/
if((vendor = ConfigReadWord(bus, slot, 0,0)) != 0xFFFF) {
device = ConfigReadWord(bus, slot, 0,2);
// Possible read more config values ...
} return (vendor);
}
void checkDevice (uint8_t bus, uint8_t device ) {
uint8_t function = 0;
uint16_t vendorID = CheckVendor(bus, device);
if (vendorID == 0xFFFF) {
return;
}
checkFunction (bus, device, function );
headerType = getHeaderType(bus, device, function );
if( (headerType & 0x80) != 0) {
/* It is a multi-function device, so check remaining functions */
for (function = 1; function < 8; function++){
if (CheckVendor(bus, device)!= 0xFFFF){
checkFunction(bus, device, function );
}
}
}
}
void checkFunction (uint8_t bus, uint8_t device, uint8_t function ){
uint8_t baseClass;
uint8_t subClass;
uint8_t secondaryBus;
baseClass = getBaseClass(bus, device, function);
subClass = getSubClass (bus, device, function );
if ( (baseClass == 0x06) && (subClass == 0x04)){
secondaryBus = getSecondaryBus(bus,device, function);
checkBus(secondaryBus);
}
}
// Brute-force scan
void checkAllBuses (){
uint16_t bus;
uint8_t device;
for(bus = 0; bus < 256; bus++){
for(device = 0; device < 32; device++){
checkDevice(bus,device);
}
}
}
// Recursive scan
void checkBus (uint8_t bus){
uint8_t device;
for(device = 0; device < 32; device ++){
checkDevice(bus,device);
}
}
void checkAllBuses(){
uint8_t function;
uint8_t bus;
headerType = getHeaderType(0,0,0);
if ( (headerType & 0x80) == 0 ){
/* Single PCI host controller */
checkBus(0);
} else{
/* Multiple PCI host controllers */
for (function = 0; function < 8; function++){
if( CheckVendor(0,0) != 0xFFFF) {
break;
}
bus = function;
checkBus(bus);
}
}
}

58
src/kernel/pci.h
View File

@ -1,58 +0,0 @@
#pragma once
#include <stdint.h>
#include "io.h"
// Configuration Space Access Mechanism #1
#define CONFIG_ADDRESS 0xCF8 // Configuration adress that is to be accessed
#define CONFIG_DATA 0xCFC // Will do the actual configuration operation
/*
CONFIG_ADDRESS
32 bit register
bit 31 Enable bit (Should CONFIG_DATA be translatedc to configuration cycles)
bit 30 - 24 Reserved
bit 23 - 16 Bus Number (Choose a specific PCI BUS)
bit 15 - 11 Device Number (Selects specific device one the pci bus)
bit 10 - 8 Function Number (Selects a specific function in a device)
bit 7 - 0 Register Offset (Offset in the configuration space of 256 Bytes ) NOTE: lowest two bits will always be zero
*/
/*
PCI Device structure
Register offset bits 31-24 bits 23-16 bits 15-8 bits 7-0
00 00 Device ID <---- Vendor ID <-------
01 04 Status <---- Command <-------
02 08 Class code Sub class Prog IF Revision ID
03 0C BIST Header Type Ltncy Timer Cache line Size
04 10 Base address #0 (BAR0)
05 14 Base address #1 (BAR1)
06 18 Base address #2 (BAR2)
07 1C Base address #3 (BAR3)
08 20 Base address #4 (BAR4)
09 24 Base address #5 (BAR5)
0A 28 Cardbus CIS Pointer
0B 2C Subsystem ID <------ Subsystem Vendor ID <-------
0C 30 Expansion ROM base address
0D 34 Reserved <------- Capabilities Pointer <------
0E 38 Reserved <------- <-------- <--------
0F 3C Max ltncy Min Grant Interrupt PIN Interrupt Line
*/
/*
The idea for now is to support the minimal things necessary to find ATA supported drives
*/
// Lets write some boiler plate configuration code
uint16_t ConfigReadWord (uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset);
uint16_t CheckVendor (uint8_t bus, uint8_t slot);
void checkDevice (uint8_t bus, uint8_t device );

133
src/kernel/serial.h
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@ -1,133 +0,0 @@
#pragma once
#include "tty/kterm.h"
#include "io.h"
#define PORT 0x3f8
inline static int init_serial() {
outb(PORT + 1, 0x00); // Disable all interrupts
outb(PORT + 3, 0x80); // Enable DLAB (set baud rate divisor)
outb(PORT + 0, 0x03); // Set divisor to 3 (lo byte) 38400 baud
outb(PORT + 1, 0x00); // (hi byte)
outb(PORT + 3, 0x03); // 8 bits, no parity, one stop bit
outb(PORT + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold
outb(PORT + 4, 0x0B); // IRQs enabled, RTS/DSR set
outb(PORT + 4, 0x1E); // Set in loopback mode, test the serial chip
outb(PORT + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)
// Check if serial is faulty (i.e: not same byte as sent)
if(inb(PORT + 0) != 0xAE) {
return 1;
}
// If serial is not faulty set it in normal operation mode
// (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
outb(PORT + 4, 0x0F);
return 0;
}
inline int is_transmit_empty() {
return inb(PORT + 5) & 0x20;
}
inline void write_serial(char a) {
while (is_transmit_empty() == 0);
outb(PORT,a);
}
inline int serial_received() {
return inb(PORT + 5) & 1;
}
inline char read_serial() {
while (serial_received() == 0);
return inb(PORT);
}
inline void print_serial(const char* string ){
for(size_t i = 0; i < strlen(string); i ++){
write_serial(string[i]);
}
}
inline void printf_serial ( const char *format, ...) {
char **arg = (char **)&format;
int c;
char buf[20];
arg++;
while ((c = *format++) != 0){
if( c != '%')
write_serial(c);
else{
char *p, *p2;
int pad0 = 0, pad = 0;
c = *format++;
if(c =='0'){
pad0 = 1;
c = *format++;
}
if ( c >= '0' && c <= '9'){
pad = c - '0';
c = *format++;
}
switch (c)
{
case 'd':
case 'u':
case 'x':
itoa(buf, c, *((int *) arg++));
p = buf;
goto string;
break;
case 's':
p = *arg++;
if(!p)
p = "(null)";
string:
for (p2 = p; *p2; p2++);
for (; p2 < p + pad; p2++)
write_serial(pad0 ? '0': ' ');
while (*p)
write_serial(*p++);
break;
default:
write_serial(*((int *)arg++));
break;
}
}
}
}
inline void test_serial(){
/** Serial test **/
kterm_writestring("Writing to COM1 serial port:");
init_serial();
write_serial('A');
write_serial('B');
write_serial('C');
write_serial('D');
write_serial('E');
char Character_received = read_serial();
kterm_writestring("\n");
kterm_writestring("received from COM 1: \n");
kterm_put(Character_received);
kterm_writestring("\n");
}

4
src/kernel/time.h
View File

@ -49,8 +49,6 @@ void read_rtc() {
year = get_RTC_register(0x09);
if(century_register != 0) {
century = get_RTC_register(century_register);
} else {
century = 21;
}
do {
@ -143,7 +141,7 @@ void WriteTOCMOS(unsigned char array[])
asm("cli\n\t" // Clear interrupts
"mov al,index\n\t" // move index address
"out 0x70,al\n\t" // copy address to CMOS register
// some kind of real delay here is probably best
/* some kind of real delay here is probably best
"mov al,tvalue\n\t" // move value to al
"out 0x71,al\n\t" // write 1 byte to CMOS
"sti\n\\t" ); // Enable interrupts

41
src/kernel/vga/VBE.h
View File

@ -1,41 +0,0 @@
#define VBE_DISPI_IOPORT_INDEX 0x01CE
#define VBE_DISPI_IOPORT_DATA 0x01CF
/* VBE index values*/
#define VBE_DISPI_INDEX_ID 0x0
#define VBE_DISPI_INDEX_XRES 0x1
#define VBE_DISPI_INDEX_YRES 0x2
#define VBE_DISPI_INDEX_BPP 0x3
#define VBE_DISPI_INDEX_ENABLE 0x4
#define VBE_DISPI_INDEX_BANK 0x5
#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
#define VBE_DISPI_INDEX_X_OFFSET 0x8
#define VBE_DISPI_INDEX_Y_OFFSET 0x9
/* BGA Version */
#define VBE_DISPI_ID5 0xB0C5
#define VBE_DISPI_ID4 0xB0C3
#define VBE_DISPI_ID3 0xB0C2
#define VBE_DISPI_ID2 0xB0C1
#define VBE_DISPI_ID1 0xB0C0
/* BGA BIT DEPTH */
#define VBE_DISPI_BPP_4 0x04
#define VBE_DISPI_BPP_8 0x08
#define VBE_DISPI_BPP_15 0x0F
#define VBE_DISPI_BPP_16 0x10
#define VBE_DISPI_BPP_24 0x18
#define VBE_DISPI_BPP_32 0x20
/*unsigned short BGAReadRegister(unsigned short IndexValue){
// outpw(VBE_DISPI_IOPORT_INDEX, IndexValue);
// return inpw (VBE_DISPI_IOPORT_DATA);
}
int BGAIsAvailable (){
return (BGAReadRegister(VBE_DISPI_INDEX_ID) == VBE_DISPI_ID5);
}*/

8
src/libc/include/mem.h
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@ -1,8 +0,0 @@
inline void* memset (void* ptr, int value, size_t num){
for( int i = 0; i < num; i++ )
{
int* data = (int*)ptr+ i;
*data = value;
}
return ptr;
}

9
src/libc/include/string.c
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@ -1,9 +0,0 @@
#include "string.h"
size_t strlen(const char* str) {
size_t len = 0;
while(str[len]){
len++;
}
return len;
}

9
src/libc/include/string.h
View File

@ -1,3 +1,8 @@
#pragma once
#include <stddef.h>
size_t strlen(const char* str);
size_t strlen(const char* str){
size_t len = 0;
while(str[len]){
len++;
}
return len;
}