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Split up boot.s into multiple assembly definitions, Started page frame allocator implementation, kterm definition is now considered c plus plus

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This commit is contained in:
Nigel Barink 2021-11-03 20:03:38 +01:00
parent bdcf9e66f8
commit d79fc6e8e2
18 changed files with 695 additions and 725 deletions
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9
Makefile
View File

@ -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)/kterm.o $(BUILD_DIR)/kernel.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.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)/PageFrameAllocator.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
SRC_DIR = src
BUILD_DIR = build
@ -57,10 +57,10 @@ $(BUILD_DIR)/kernel.o:
$(CPP) -c $(SRC_DIR)/kernel/kernel.cpp -o $(BUILD_DIR)/kernel.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/kterm.o:
$(CC) -c $(SRC_DIR)/kernel/arch/i386/tty/kterm.c -o $(BUILD_DIR)/kterm.o $(CFLAGS) -std=gnu99
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/tty/kterm.cpp -o $(BUILD_DIR)/kterm.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/boot.o:
$(AS) $(SRC_DIR)/kernel/arch/i386/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/arch/i386/crti.s -o $(BUILD_DIR)/crti.o
@ -82,3 +82,6 @@ $(BUILD_DIR)/pic.o:
$(BUILD_DIR)/string.o:
$(CC) -c $(SRC_DIR)/libc/include/string.c -o $(BUILD_DIR)/string.o $(CFLAGS) -std=gnu99
$(BUILD_DIR)/PageFrameAllocator.o:
$(CPP) -c $(SRC_DIR)/kernel/memory/PageFrameAllocator.cpp -o $(BUILD_DIR)/PageFrameAllocator.o $(CFLAGS) -fno-exceptions -fno-rtti

89
src/kernel/arch/i386/boot.S Normal file
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@ -0,0 +1,89 @@
/*
* 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
.include "./src/kernel/arch/i386/irs_table.s"
.include "./src/kernel/arch/i386/irq_table.s"
.include "./src/kernel/arch/i386/idt/idt.s"
.include "./src/kernel/arch/i386/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
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
.include "./src/kernel/arch/i386/gdt/gdt.s"

566
src/kernel/arch/i386/boot.s
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@ -1,566 +0,0 @@
/*
* 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 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
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:

37
src/kernel/arch/i386/gdt/gdt.s Normal file
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@ -0,0 +1,37 @@
/* 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:

4
src/kernel/arch/i386/idt/idt.h
View File

@ -5,9 +5,7 @@
#include "../vga/colors.h"
#include "../pic/pic.h"
extern "C"{
#include "../tty/kterm.h"
}
#include "../tty/kterm.h"
extern "C" {

6
src/kernel/arch/i386/idt/idt.s Normal file
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@ -0,0 +1,6 @@
.globl idt_flush
idt_flush:
mov 4(%esp), %eax
lidt (%eax)
ret

138
src/kernel/arch/i386/irq_table.s Normal file
View File

@ -0,0 +1,138 @@
.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/arch/i386/irs_table.s Normal file
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@ -0,0 +1,256 @@
/*
* 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

20
src/kernel/arch/i386/paging.s Normal file
View File

@ -0,0 +1,20 @@
.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

4
src/kernel/arch/i386/tty/kterm.c → src/kernel/arch/i386/tty/kterm.cpp
View File

@ -202,10 +202,8 @@ void printf ( const char *format, ...) {
switch (c)
{
case 'd':
kterm_writestring("Not implemented!!");
break;
case 'u':
break;
case 'x':
itoa(buf, c, *((int *) arg++));

5
src/kernel/arch/i386/tty/kterm.h
View File

@ -7,8 +7,9 @@
#include "../vga/colors.h"
#include "../../../io.h"
#include "./../../../../libc/include/string.h"
extern "C"{
#include "./../../../../libc/include/string.h"
}
void kterm_init();

4
src/kernel/bootcheck.h
View File

@ -2,9 +2,7 @@
#include "bootloader/multiboot.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
extern "C" {
#include "arch/i386/tty/kterm.h"
}
#include "arch/i386/tty/kterm.h"

56
src/kernel/kernel.cpp
View File

@ -1,8 +1,7 @@
#include "kernel.h"
#include "arch/i386/gdt/gdtc.h"
extern "C" {
#include "memory/PageFrameAllocator.h"
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();
@ -13,58 +12,13 @@ extern "C" {
CheckMBT( (multiboot_info_t *) addr);
multiboot_info_t* mbt = (multiboot_info_t*) addr;
// Map the kernel
//initPhysicalMemoryManager();
// AAAAAH memory map, Yes please!
/* Are mmap_* valid? */
if (CHECK_FLAG(mbt->flags, 6)){
multiboot_memory_map_t *mmap = (multiboot_memory_map_t*) mbt->mmap_addr;
uint32_t memorySizeInBytes = 0;
uint32_t reservedMemoryInBytes = 0;
mapMultibootMemoryMap(mbt);
printf("mmap_addr = 0x%x, mmap_length = 0x%x\n",
(unsigned) mbt->mmap_addr, (unsigned) mbt->mmap_length);
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){
memorySizeInBytes += mmap->len;
} else {
reservedMemoryInBytes += mmap->len;
}
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);
}
uint32_t memorySizeInGiB = memorySizeInBytes / 1073741824;
printf("Available Memory: 0x%x bytes, 0x%x GiB\n", memorySizeInBytes, memorySizeInGiB );
printf("Reserved Memory: 0x%x bytes\n", reservedMemoryInBytes );
}
//int cpu_model = get_model();
//int local_apic = check_apic();
//printf( "CPU Model: %x, Local APIC: %D\n", cpu_model, local_apic);
/* Setup Paging and memory Managment*/
//MMU MemoryManagementUnit = MMU();
//MemoryManagementUnit.enable(); // Warning: Causes triple page fault
//printf("Pages available: %9d\n", pmm_available());
/* Draw diagonal blue line */
if (CHECK_FLAG (mbt->flags, 12)){
@ -76,7 +30,7 @@ extern "C" {
}
void kernel_main (void) {
extern "C" void kernel_main (void) {
init_serial();
@ -88,4 +42,4 @@ extern "C" {
}
}
}

103
src/kernel/kernel.h
View File

@ -1,19 +1,24 @@
#pragma once
extern "C" {
#include "arch/i386/tty/kterm.h"
#pragma once
extern "C"{
#include "../libc/include/string.h"
}
#include "arch/i386/vga/VBE.h"
#include "arch/i386/tty/kterm.h"
#include "../libc/include/string.h"
#include "./bootloader/multiboot.h"
#include "bootcheck.h"
#include "arch/i386/gdt/gdtc.h"
#include "arch/i386/idt/idt.h"
#include "io.h"
#include "time.h"
#include "cpu.h"
#include "arch/i386/vga/VBE.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
#include "serial.h"
#define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
#define PANIC(message) { return; }
/* This needs to be moved! */
@ -26,89 +31,3 @@ void delay(int t){
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");
}

1
src/kernel/memory/PageFramAllocator.cpp
View File

@ -1 +0,0 @@
#include "PageFrameAllocator.h"

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

@ -0,0 +1,38 @@
#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
);
}

14
src/kernel/memory/PageFrameAllocator.h
View File

@ -1,8 +1,20 @@
#pragma once
#include <stdint.h>
#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*);

70
src/kernel/serial.h Normal file
View File

@ -0,0 +1,70 @@
#pragma once
#include "arch/i386/tty/kterm.h"
#include "io.h"
#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");
}