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Document amd64 platform-specific code

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This commit is contained in:
Kamil Kowalczyk
2025-12-30 16:50:15 +01:00
parent 4f4f5c3d2f
commit 34f1e0ba30
17 changed files with 171 additions and 19 deletions
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9
kernel/amd64/init.c
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@@ -14,6 +14,7 @@
#define TSS 0x80
#define TSS_PRESENT 0x89
/// Set a GDT entry
static void amd64_gdt_set (volatile struct gdt_entry* ent, uint32_t base, uint32_t limit,
uint8_t acc, uint8_t gran) {
ent->baselow = (base & 0xFFFF);
@@ -24,6 +25,7 @@ static void amd64_gdt_set (volatile struct gdt_entry* ent, uint32_t base, uint32
ent->access = acc;
}
/// Initialize GDT and TSS structures for a given CPU
static void amd64_gdt_init (struct cpu* cpu) {
volatile struct tss* tss = &cpu->tss;
volatile struct gdt_extended* gdt = &cpu->gdt;
@@ -75,6 +77,13 @@ static void amd64_gdt_init (struct cpu* cpu) {
__asm__ volatile ("ltr %0" ::"r"((uint16_t)GDT_TSS));
}
/**
* @brief Initialize essentials (GDT, TSS, IDT) for a given CPU
*
* @param load_idt
* Tell whether the IDT needs to be loaded. It only has to be loaded once on
* the BSP
*/
void amd64_init (struct cpu* cpu, bool load_idt) {
amd64_gdt_init (cpu);
if (load_idt)