Nigel/BarinkOS
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GDT is running again

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This commit is contained in:
Nigel Barink 2021-11-06 21:56:42 +01:00
parent 5fb55367ca
commit 32909aaed9
5 changed files with 20 additions and 13 deletions
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6
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)/PhysicalMemoryManager.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)/PhysicalMemoryManager.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
SRC_DIR = src
BUILD_DIR = build
@ -77,6 +77,10 @@ $(BUILD_DIR)/PageDirectory.o:
$(BUILD_DIR)/idt.o:
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/idt/idt.cpp -o $(BUILD_DIR)/idt.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/gdtc.o:
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/gdt/gdtc.cpp -o $(BUILD_DIR)/gdtc.o $(CFLAGS) -fno-exceptions -fno-rtti
$(BUILD_DIR)/pic.o:
$(CPP) -c $(SRC_DIR)/kernel/arch/i386/pic/pic.cpp -o $(BUILD_DIR)/pic.o $(CFLAGS) -fno-exceptions -fno-rtti

2
src/kernel/arch/i386/boot.S
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@ -46,7 +46,7 @@ _start:
call early_main
cli
.global load_gdt
load_gdt:
lgdt gdt

10
src/kernel/arch/i386/gdt/gdtc.cpp
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@ -2,6 +2,8 @@
#include "../tty/kterm.h"
gdtEntry_t gdt[3];
gdtSegmentPointer gdtPointer{};
void gdtSetGate(int num, uint64_t base, uint64_t limit, uint8_t access,
@ -18,14 +20,12 @@ void gdtSetGate(int num, uint64_t base, uint64_t limit, uint8_t access,
}
void setupGdt(){
printf("setupGdt is called!");
gdtPointer.limit = (sizeof(gdtEntry_t) * 3) - 1;
gdtPointer.base = &gdt;
gdtPointer.base = (uint32_t) &gdt;
gdtSetGate(0, 0, 0, 0, 0);
gdtSetGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
gdtSetGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
loadGdt();
printf("call to load gdt\n");
load_gdt();
}

8
src/kernel/arch/i386/gdt/gdtc.h
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@ -10,11 +10,13 @@ typedef struct {
uint8_t hBase;
} gdtEntry_t;
struct {
struct gdtSegmentPointer {
uint16_t limit;
uint32_t base;
} gdtPointer;
};
extern void loadGdt();
extern gdtSegmentPointer gdtPointer;
extern void load_gdt();
void setupGdt();
}

7
src/kernel/kernel.cpp
View File

@ -26,17 +26,18 @@
printf("kernel: 0x%x - 0x%x\n", &kernel_begin , &kernel_end);
}
//setupGdt();
printf("Call to setupGdt!\n");
setupGdt();
}
extern "C" void kernel_main (void) {
printf("call to init serial\n");
init_serial();
while (false){
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);