2022-09-14 21:54:59 -05:00
|
|
|
#include <stdint.h>
|
|
|
|
|
2022-09-19 16:06:01 -05:00
|
|
|
#include "tss.h"
|
|
|
|
|
2022-09-14 21:54:59 -05:00
|
|
|
struct __attribute__((__packed__)) tss_entry_struct {
|
|
|
|
uint32_t prev_tss;
|
|
|
|
uint32_t esp0;
|
|
|
|
uint32_t ss0;
|
|
|
|
uint32_t esp1;
|
|
|
|
uint32_t ss1;
|
|
|
|
uint32_t esp2;
|
|
|
|
uint32_t ss2;
|
|
|
|
uint32_t cr3;
|
|
|
|
uint32_t eip;
|
|
|
|
uint32_t eflags;
|
|
|
|
uint32_t eax;
|
|
|
|
uint32_t ecx;
|
|
|
|
uint32_t edx;
|
|
|
|
uint32_t ebx;
|
|
|
|
uint32_t esp;
|
|
|
|
uint32_t ebp;
|
|
|
|
uint32_t esi;
|
|
|
|
uint32_t edi;
|
|
|
|
uint32_t es;
|
|
|
|
uint32_t cs;
|
|
|
|
uint32_t ss;
|
|
|
|
uint32_t ds;
|
|
|
|
uint32_t fs;
|
|
|
|
uint32_t gs;
|
|
|
|
uint32_t ldt;
|
|
|
|
uint32_t trap;
|
|
|
|
uint32_t iomap_base;
|
|
|
|
};
|
|
|
|
struct tss_entry_struct *tss_data;
|
|
|
|
void write_tss() {
|
2023-01-31 21:26:43 -06:00
|
|
|
tss_data = (struct tss_entry_struct *)0x200000;
|
2022-09-14 21:54:59 -05:00
|
|
|
for (int i = 0; i < 0x2080; i++)
|
|
|
|
((uint8_t*)tss_data)[i] = 0;
|
|
|
|
tss_data->ss0 = 0x10;
|
2022-09-19 16:06:01 -05:00
|
|
|
tss_data->esp0 = 0x320000;
|
2022-09-14 21:54:59 -05:00
|
|
|
tss_data->iomap_base = 0x80;
|
2022-09-19 16:06:01 -05:00
|
|
|
|
|
|
|
// not technically TSS but set up task pointer
|
2024-01-07 22:33:27 -06:00
|
|
|
uint32_t *current_task_ptr = (uint32_t*)(0x310000);
|
|
|
|
*current_task_ptr = 0x310000-(1*4); // each task is 12 dwords, plus 1 for pointer
|
2022-09-19 16:06:01 -05:00
|
|
|
/* TODO setup null recovery task at start */
|
2022-09-14 21:54:59 -05:00
|
|
|
}
|
|
|
|
extern void flushTSS();
|
|
|
|
|
|
|
|
void setup_tss() {
|
|
|
|
write_tss();
|
|
|
|
flushTSS();
|
|
|
|
}
|