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Set task state segment

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This commit is contained in:
Braiden Vasco 2017-11-05 15:16:56 +00:00
parent adcb66761b
commit a7cdcecbdc
5 changed files with 102 additions and 1 deletions
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2
arch/Makefile
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@ -18,6 +18,8 @@ OBJS += kprintf.c.o
OBJS += protected.c.o protected.asm.cpp.o
OBJS += tss.c.o
OBJS += interrupt.asm.cpp.o
OBJS += exception.c.o

4
arch/config.h
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@ -16,7 +16,8 @@
#define GDT_KERNEL_DS_INDEX 2
#define GDT_USER_CS_INDEX 3
#define GDT_USER_DS_INDEX 4
#define GDT_SIZE 5
#define GDT_TSS_INDEX 5
#define GDT_SIZE 6
#define GDT_DESCRIPTOR_SIZE 8 // bytes
@ -27,6 +28,7 @@
#define GDT_KERNEL_DS_SELECTOR GDT_SEGMENT_SELECTOR(GDT_KERNEL_DS_INDEX)
#define GDT_USER_CS_SELECTOR GDT_SEGMENT_SELECTOR(GDT_USER_CS_INDEX)
#define GDT_USER_DS_SELECTOR GDT_SEGMENT_SELECTOR(GDT_USER_DS_INDEX)
#define GDT_TSS_SELECTOR GDT_SEGMENT_SELECTOR(GDT_TSS_INDEX)
#define INT_EXCEPTION_COUNT 32
#define INT_HWINT_COUNT 16

3
arch/protected.c
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@ -5,6 +5,7 @@
#include "asm.h"
#include "interrupt.h"
#include "hwint.h"
#include "tss.h"
#include <kernelmq/stdlib.h>
@ -75,6 +76,8 @@ void protected_initialize()
gdt_set_gate(GDT_USER_CS_INDEX, 0, 0xFFFFFFFF, 0xFA, 0xCF);
gdt_set_gate(GDT_USER_DS_INDEX, 0, 0xFFFFFFFF, 0xF2, 0xCF);
tss_write_to_gdt(&gdt_entries[GDT_TSS_INDEX]);
logger_info("Setup IDT.");
kmemset(idt_entries, 0, sizeof(idt_entries));

88
arch/tss.c Normal file
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@ -0,0 +1,88 @@
#include "tss.h"
#include "config.h"
#include <kernelmq/stdlib.h>
struct gdt_entry_bits {
unsigned int limit_low : 16;
unsigned int base_low : 24;
unsigned int accessed : 1;
unsigned int read_write : 1;
unsigned int conforming_expand_down : 1;
unsigned int code : 1;
unsigned int always_1 : 1;
unsigned int DPL : 2;
unsigned int present : 1;
unsigned int limit_high : 4;
unsigned int available : 1;
unsigned int always_0 : 1;
unsigned int big : 1;
unsigned int gran : 1;
unsigned int base_high : 8;
}
__attribute__((packed));
struct tss_entry {
unsigned int prev_tss;
unsigned int esp0;
unsigned int ss0;
unsigned int esp1;
unsigned int ss1;
unsigned int esp2;
unsigned int ss2;
unsigned int cr3;
unsigned int eip;
unsigned int eflags;
unsigned int eax;
unsigned int ecx;
unsigned int edx;
unsigned int ebx;
unsigned int esp;
unsigned int ebp;
unsigned int esi;
unsigned int edi;
unsigned int es;
unsigned int cs;
unsigned int ss;
unsigned int ds;
unsigned int fs;
unsigned int gs;
unsigned int ldt;
unsigned short trap;
unsigned short iomap_base;
}
__attribute__((packed));
static struct tss_entry tss;
void tss_write_to_gdt(void *gdt_entry_ptr)
{
struct gdt_entry_bits *const g = gdt_entry_ptr;
unsigned long base = (unsigned long)&tss;
unsigned long limit = sizeof(tss);
g->limit_low = limit & 0xFFFF;
g->base_low = base & 0xFFFFFF;
g->base_high = (base & 0xFF000000) >> 24;
g->limit_high = (limit & 0xF0000) >> 16;
g->accessed = 1;
g->read_write = 0;
g->conforming_expand_down = 0;
g->code = 1;
g->always_1 = 0;
g->DPL = 3;
g->present = 1;
g->available = 0;
g->always_0 = 0;
g->big = 0;
g->gran = 0;
kmemset(&tss, 0, sizeof(tss));
tss.ss0 = GDT_KERNEL_DS_SELECTOR;
tss.esp0 = 0; // TODO: get from kinfo
}

6
arch/tss.h Normal file
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@ -0,0 +1,6 @@
#ifndef KERNELMQ_INCLUDED_TSS
#define KERNELMQ_INCLUDED_TSS 1
void tss_write_to_gdt(void *gdt_entry);
#endif