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Nicolás Ortega Froysa 2018-04-04 17:58:47 +02:00
parent a495a08cc0
commit 1e72b5f05e
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1 changed files with 8 additions and 1 deletions
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9
src/kernel/arch/x86/gdt.c
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@ -25,7 +25,7 @@
* 3/4 - user entries * 3/4 - user entries
* 5 - TSS entry * 5 - TSS entry
*/ */
#define GDT_SIZE 3 #define GDT_SIZE 6
struct segdesc gdt[GDT_SIZE]; struct segdesc gdt[GDT_SIZE];
struct segreg gdtr; struct segreg gdtr;
@ -51,8 +51,15 @@ void gdt_install() {
gdtr.limit = sizeof(gdt)-1; gdtr.limit = sizeof(gdt)-1;
gdt_entry_set(&gdt[0], 0, 0, 0, 0); gdt_entry_set(&gdt[0], 0, 0, 0, 0);
// kernel
gdt_entry_set(&gdt[1], 0, 0xFFFFFFFF, 0x9A, 0xCF); gdt_entry_set(&gdt[1], 0, 0xFFFFFFFF, 0x9A, 0xCF);
gdt_entry_set(&gdt[2], 0, 0xFFFFFFFF, 0x92, 0xCF); gdt_entry_set(&gdt[2], 0, 0xFFFFFFFF, 0x92, 0xCF);
// user
gdt_entry_set(&gdt[3], 0, 0xFFFFFFFF, 0xFA, 0xCF);
gdt_entry_set(&gdt[4], 0, 0xFFFFFFFF, 0xF2, 0xCF);
// TSS
// TODO: create a proper TSS
gdt_entry_set(&gdt[5], 0, 0, 0x91, 0x40);
gdt_flush(&gdtr); gdt_flush(&gdtr);
} }