mirrors/Astral
1
0
Fork 0
mirror of https://github.com/Mathewnd/Astral.git synced 2026-11-02 07:28:21 +00:00
Code Issues Packages Projects Releases Wiki Activity

Initial commit

Browse Source
This commit is contained in:
Matheus
2022-07-21 22:50:12 -03:00
commit b44469a3e1
55 changed files with 4661 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/arch/x86_64/gdt.c
+52
View File
@@ -0,0 +1,52 @@
#include <arch/cls.h>
#include <arch/gdt.h>
#include <arch/ist.h>
static void setseg(segdesc __seg_gs *seg, uint32_t limit, uint32_t offset, uint8_t flags, uint8_t access){
}
static void setsys64(sys64 __seg_gs *e, uint32_t limit, uint64_t offset, uint8_t flags, uint8_t access){
}
static void reloadgdtr(){
gdtr_t gdtr;
gdtr.offset = (uint64_t)&cls->gdt + arch_getcls();
gdtr.size = sizeof(gdt_t) - 1;
asm("lgdt (%%rax)" : : "a"(&gdtr) : "memory");
}
void gdt_bspinit(){
gdt_t __seg_gs *gdt = &cls->gdt;
setseg(&gdt->null, 0, 0, 0, 0);
setseg(&gdt->kcode16, 0xFFFFF, 0, FLAGS_PAGE_GRANULARITY, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_EXEC | ACCESS_CODE_READ);
setseg(&gdt->kdata16, 0xFFFFF, 0, FLAGS_PAGE_GRANULARITY, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_DATA_WRITE);
setseg(&gdt->kcode32, 0xFFFFF, 0, FLAGS_PAGE_GRANULARITY | FLAGS_PMODE, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_CODE_READ);
setseg(&gdt->kdata32, 0xFFFFF, 0, FLAGS_PAGE_GRANULARITY | FLAGS_PMODE, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_DATA_WRITE);
setseg(&gdt->kcode64, 0, 0, FLAGS_PAGE_GRANULARITY | FLAGS_LONG, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_EXEC | ACCESS_CODE_READ);
setseg(&gdt->kdata64, 0, 0, FLAGS_PAGE_GRANULARITY | FLAGS_LONG, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_DATA_WRITE);
setseg(&gdt->kcode64, 0, 0, FLAGS_PAGE_GRANULARITY | FLAGS_LONG, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_EXEC | ACCESS_CODE_READ | ACCESS_DPL3);
setseg(&gdt->kdata64, 0, 0, FLAGS_PAGE_GRANULARITY | FLAGS_LONG, ACCESS_PRESENT | ACCESS_SEGMENT | ACCESS_DATA_WRITE | ACCESS_DPL3);
// TODO get this working right
//setsys64(&gdt->ist, sizeof(ist_t), (uint64_t)(arch_getcls()), FLAGS_LONG, SYSTEM_TYPE_IST | ACCESS_PRESENT);
reloadgdtr();
}