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Use separate IST stack for IRQs and cpu exceptions

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This commit is contained in:
Kamil Kowalczyk
2025-12-22 22:19:01 +01:00
parent 1fd6f4890d
commit 259aa732c8
3 changed files with 57 additions and 53 deletions
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2
kernel/amd64/bootmain.c
View File

@@ -1,6 +1,7 @@
#include <amd64/apic.h>
#include <amd64/hpet.h>
#include <amd64/init.h>
#include <amd64/debug.h>
#include <aux/compiler.h>
#include <limine/limine.h>
#include <mm/liballoc.h>
@@ -16,6 +17,7 @@ ALIGNED (16) static uint8_t uacpi_memory_buffer[UACPI_MEMORY_BUFFER_MAX];
void bootmain (void) {
amd64_init ();
amd64_debug_init ();
pmm_init ();
mm_init ();

6
kernel/amd64/init.c
View File

@@ -1,4 +1,3 @@
#include <amd64/debug.h>
#include <amd64/init.h>
#include <amd64/intr.h>
#include <amd64/tss.h>
@@ -38,6 +37,8 @@ struct gdt_extended {
} PACKED;
ALIGNED (16) static volatile uint8_t kernel_stack[KSTACK_SIZE];
ALIGNED (16) static volatile uint8_t except_stack[KSTACK_SIZE];
ALIGNED (16) static volatile uint8_t irq_stack[KSTACK_SIZE];
ALIGNED (16) static volatile struct gdt_extended gdt;
static void amd64_gdt_set (volatile struct gdt_entry* ent, uint32_t base, uint32_t limit,
@@ -59,6 +60,8 @@ static void amd64_gdt_init (void) {
tss->iopb_off = sizeof (*tss);
tss->rsp0 = (uint64_t)((uintptr_t)kernel_stack + sizeof (kernel_stack));
tss->ist[0] = (uint64_t)((uintptr_t)except_stack + sizeof (except_stack));
tss->ist[1] = (uint64_t)((uintptr_t)irq_stack + sizeof (irq_stack));
uint64_t tssbase = (uint64_t)&tss;
uint64_t tsslimit = sizeof (*tss) - 1;
@@ -101,6 +104,5 @@ static void amd64_gdt_init (void) {
void amd64_init (void) {
amd64_gdt_init ();
amd64_debug_init ();
amd64_intr_init ();
}

102
kernel/amd64/intr.c
View File

@@ -77,7 +77,7 @@ static void amd64_init_pic (void) {
#undef IO_OP
}
static void amd64_idt_set (volatile struct idt_entry* ent, uint64_t handler, uint8_t flags) {
static void amd64_idt_set (volatile struct idt_entry* ent, uint64_t handler, uint8_t flags, uint8_t ist) {
ent->intrlow = (handler & 0xFFFF);
ent->kernel_cs = 0x08; // GDT_KCODE (init.c)
ent->ist = 0;
@@ -90,57 +90,57 @@ static void amd64_idt_set (volatile struct idt_entry* ent, uint64_t handler, uin
static void amd64_idt_init (void) {
memset ((void*)idt_entries, 0, sizeof (idt_entries));
#define IDT_ENTRY(n) \
#define IDT_ENTRY(n, ist) \
extern void amd64_intr##n (void); \
amd64_idt_set (&idt_entries[(n)], (uint64_t)&amd64_intr##n, 0x8E)
IDT_ENTRY (0);
IDT_ENTRY (1);
IDT_ENTRY (2);
IDT_ENTRY (3);
IDT_ENTRY (4);
IDT_ENTRY (5);
IDT_ENTRY (6);
IDT_ENTRY (7);
IDT_ENTRY (8);
IDT_ENTRY (9);
IDT_ENTRY (10);
IDT_ENTRY (11);
IDT_ENTRY (12);
IDT_ENTRY (13);
IDT_ENTRY (14);
IDT_ENTRY (15);
IDT_ENTRY (16);
IDT_ENTRY (17);
IDT_ENTRY (18);
IDT_ENTRY (19);
IDT_ENTRY (20);
IDT_ENTRY (21);
IDT_ENTRY (22);
IDT_ENTRY (23);
IDT_ENTRY (24);
IDT_ENTRY (25);
IDT_ENTRY (26);
IDT_ENTRY (27);
IDT_ENTRY (28);
IDT_ENTRY (29);
IDT_ENTRY (30);
IDT_ENTRY (31);
IDT_ENTRY (32);
IDT_ENTRY (33);
IDT_ENTRY (34);
IDT_ENTRY (35);
IDT_ENTRY (36);
IDT_ENTRY (37);
IDT_ENTRY (38);
IDT_ENTRY (39);
IDT_ENTRY (40);
IDT_ENTRY (41);
IDT_ENTRY (42);
IDT_ENTRY (43);
IDT_ENTRY (44);
IDT_ENTRY (45);
IDT_ENTRY (46);
IDT_ENTRY (47);
amd64_idt_set (&idt_entries[(n)], (uint64_t)&amd64_intr##n, 0x8E, (ist))
IDT_ENTRY (0, 0);
IDT_ENTRY (1, 0);
IDT_ENTRY (2, 0);
IDT_ENTRY (3, 0);
IDT_ENTRY (4, 0);
IDT_ENTRY (5, 0);
IDT_ENTRY (6, 0);
IDT_ENTRY (7, 0);
IDT_ENTRY (8, 0);
IDT_ENTRY (9, 0);
IDT_ENTRY (10, 0);
IDT_ENTRY (11, 0);
IDT_ENTRY (12, 0);
IDT_ENTRY (13, 0);
IDT_ENTRY (14, 0);
IDT_ENTRY (15, 0);
IDT_ENTRY (16, 0);
IDT_ENTRY (17, 0);
IDT_ENTRY (18, 0);
IDT_ENTRY (19, 0);
IDT_ENTRY (20, 0);
IDT_ENTRY (21, 0);
IDT_ENTRY (22, 0);
IDT_ENTRY (23, 0);
IDT_ENTRY (24, 0);
IDT_ENTRY (25, 0);
IDT_ENTRY (26, 0);
IDT_ENTRY (27, 0);
IDT_ENTRY (28, 0);
IDT_ENTRY (29, 0);
IDT_ENTRY (30, 0);
IDT_ENTRY (31, 0);
IDT_ENTRY (32, 1);
IDT_ENTRY (33, 1);
IDT_ENTRY (34, 1);
IDT_ENTRY (35, 1);
IDT_ENTRY (36, 1);
IDT_ENTRY (37, 1);
IDT_ENTRY (38, 1);
IDT_ENTRY (39, 1);
IDT_ENTRY (40, 1);
IDT_ENTRY (41, 1);
IDT_ENTRY (42, 1);
IDT_ENTRY (43, 1);
IDT_ENTRY (44, 1);
IDT_ENTRY (45, 1);
IDT_ENTRY (46, 1);
IDT_ENTRY (47, 1);
#undef IDT_ENTRY
idt.limit = sizeof (idt_entries) - 1;