mirror of
https://github.com/tailix/kernel.git
synced 2024-10-30 12:03:52 -04:00
87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
#include "tss.h"
|
|
|
|
#include "config.h"
|
|
|
|
#include "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;
|
|
};
|
|
|
|
static struct tss_entry tss;
|
|
|
|
void tss_write_to_gdt(const struct KernelMQ_Info *const kinfo, 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 = kinfo->kernel_stack_top;
|
|
}
|