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Setup TSS segment

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This commit is contained in:
Loic Guegan 2021-04-30 10:43:44 +02:00
parent 66f2ca6246
commit fb69c7b058
7 changed files with 89 additions and 15 deletions
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29
src/boucane.cc
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@ -19,8 +19,33 @@ u64 kvar_terminus_psf_start;
u64 kvar_terminus_psf_end;
u64 kvar_logo_bmp_start;
u64 kvar_logo_bmp_end;
TSS kvar_tss;
void (*printk)(char *str,...)=printf;
extern u64 gdt64_tss;
void configure_tss(){
u64 tss_addr=(u64)&kvar_tss;
u32 desc1=(tss_addr&0xFFFF)<<16|(sizeof(TSS)&0xFFFF);
tss_addr>>=16;
u32 desc2=(tss_addr&0xFF)|((tss_addr>>8)<<24);
tss_addr>>=16;
u32 desc3=tss_addr;
// Options
u32 options=0b1001; // 64-bits TSS type
options|=(0b1000<<4); // Present
// Configure GDT
u32 *gdt_entry=(u32*)&gdt64_tss;
gdt_entry[0]=desc1;
gdt_entry[1]=desc2|(options<<8);
gdt_entry[2]=desc3;
gdt_entry[3]=0;
// Configure segment
kvar_tss.rsp0=(u64)VIRT(kvar_stack_pma);
}
extern "C" void boucane(u64 mb_info){
// Init linker variables
@ -35,6 +60,7 @@ extern "C" void boucane(u64 mb_info){
asm volatile ("movq $res_binary_res_logo_bmp_end, %0":"=m"(kvar_logo_bmp_end));
// Init data structures
configure_tss();
asm volatile ("call load_gdt");
paging_enable();
memtext_init();
@ -74,5 +100,8 @@ extern "C" void boucane(u64 mb_info){
mem/=1024;
printk("RAM:%dMB\n", mem);
}
printk("%x",&kvar_tss);
DUMP(&gdt64_tss);
while(1);
}