diff options
Diffstat (limited to 'kernel/cpu/idt.c')
| -rw-r--r-- | kernel/cpu/idt.c | 109 |
1 files changed, 68 insertions, 41 deletions
diff --git a/kernel/cpu/idt.c b/kernel/cpu/idt.c index af12fff..3bdbe8d 100644 --- a/kernel/cpu/idt.c +++ b/kernel/cpu/idt.c @@ -9,12 +9,12 @@ #define IDT_SIZE 256 struct idt_entry { - uint16_t isr_low; // low 16 bits of isr - uint16_t kernel_cs; // kernel segment selector - uint8_t ist; // interrupt stack table - uint8_t flags; // gate type, privilege level, present bit - uint16_t isr_mid; // middle 16 bits of isr - uint32_t isr_high; // high 32 bits of isr + uint16_t isr_low; // low 16 bits of isr + uint16_t kernel_cs; // kernel segment selector + uint8_t ist; // interrupt stack table + uint8_t flags; // gate type, privilege level, present bit + uint16_t isr_mid; // middle 16 bits of isr + uint32_t isr_high; // high 32 bits of isr uint32_t reserved; } __attribute__((packed)); @@ -24,7 +24,7 @@ struct idtr { } __attribute__((packed)); // interrupt gate -#define GATE_64BIT_INT 0x0E +#define GATE_64BIT_INT 0x0E // trap gate #define GATE_64BIT_TRAP 0x0F @@ -37,15 +37,15 @@ struct idtr { // interrupt is present in IDT #define PRESENT 0x80 -__attribute__((aligned(0x10))) -static struct idt_entry idt[256]; +__attribute__((aligned(0x10))) static struct idt_entry idt[256]; static struct idtr idtr; // from idt.S extern void *isr_stub_table[]; // initialize and load the IDT -void idt_init(void) { +void idt_init(void) +{ // initialize idtr idtr.address = (uint64_t)&idt; idtr.size = (uint16_t)sizeof(struct idt_entry) * IDT_SIZE - 1; @@ -67,10 +67,11 @@ void idt_init(void) { entry->reserved = 0; } - __asm__ volatile ("lidt %0" : : "m"(idtr)); + __asm__ volatile("lidt %0" : : "m"(idtr)); } -static void isr_print_regs(struct isr_regs *regs) { +static void isr_print_regs(struct isr_regs *regs) +{ printf("rax: %#016lx (%lu)\n", regs->rax, regs->rax); printf("rbx: %#016lx (%lu)\n", regs->rbx, regs->rbx); printf("rcx: %#016lx (%lu)\n", regs->rcx, regs->rcx); @@ -79,8 +80,8 @@ static void isr_print_regs(struct isr_regs *regs) { printf("rdi: %#016lx (%lu)\n", regs->rdi, regs->rdi); printf("rsp: %#016lx (%lu)\n", regs->rsp, regs->rsp); printf("rbp: %#016lx (%lu)\n", regs->rbp, regs->rbp); - printf("r8 : %#016lx (%lu)\n", regs->r8 , regs->r8 ); - printf("r9 : %#016lx (%lu)\n", regs->r9 , regs->r9 ); + printf("r8 : %#016lx (%lu)\n", regs->r8, regs->r8); + printf("r9 : %#016lx (%lu)\n", regs->r9, regs->r9); printf("r10: %#016lx (%lu)\n", regs->r10, regs->r10); printf("r11: %#016lx (%lu)\n", regs->r11, regs->r11); printf("r12: %#016lx (%lu)\n", regs->r12, regs->r12); @@ -91,30 +92,48 @@ static void isr_print_regs(struct isr_regs *regs) { printf("rflags: %#016lx (%lu)\n", regs->rflags, regs->rflags); struct rflags *rflags = (struct rflags *)regs->rflags; puts("rflags: "); - if (rflags->cf) puts("CF "); - if (rflags->pf) puts("PF "); - if (rflags->af) puts("AF "); - if (rflags->zf) puts("ZF "); - if (rflags->sf) puts("SF "); - if (rflags->tf) puts("TF "); - if (rflags->if_) puts("IF "); - if (rflags->df) puts("DF "); - if (rflags->of) puts("OF "); - if (rflags->iopl) puts("IOPL "); - if (rflags->nt) puts("NT "); - if (rflags->md) puts("MD "); - if (rflags->rf) puts("RF "); - if (rflags->vm) puts("VM "); - if (rflags->ac) puts("AC "); - if (rflags->vif) puts("VIF "); - if (rflags->vip) puts("VIP "); - if (rflags->id) puts("ID "); + if (rflags->cf) + puts("CF "); + if (rflags->pf) + puts("PF "); + if (rflags->af) + puts("AF "); + if (rflags->zf) + puts("ZF "); + if (rflags->sf) + puts("SF "); + if (rflags->tf) + puts("TF "); + if (rflags->if_) + puts("IF "); + if (rflags->df) + puts("DF "); + if (rflags->of) + puts("OF "); + if (rflags->iopl) + puts("IOPL "); + if (rflags->nt) + puts("NT "); + if (rflags->md) + puts("MD "); + if (rflags->rf) + puts("RF "); + if (rflags->vm) + puts("VM "); + if (rflags->ac) + puts("AC "); + if (rflags->vif) + puts("VIF "); + if (rflags->vip) + puts("VIP "); + if (rflags->id) + puts("ID "); puts("\n"); } -#define EX_DEBUG 0x01 -#define EX_BREAKPOINT 0x03 -#define EX_PAGE_FAULT 0x0e +#define EX_DEBUG 0x01 +#define EX_BREAKPOINT 0x03 +#define EX_PAGE_FAULT 0x0e // Intel manual vol 3 ch 6.3.1 char *EXCEPTIONS[] = { @@ -152,13 +171,15 @@ char *EXCEPTIONS[] = { "Reserved", }; -void idt_exception_handler(uint64_t exception, uint64_t code, struct isr_regs *state) { +void idt_exception_handler(uint64_t exception, uint64_t code, + struct isr_regs *state) +{ uint64_t cr2; switch (exception) { case EX_PAGE_FAULT: // page faults store the offending address in cr2 - __asm__ volatile ("mov %%cr2, %0" : "=r"(cr2)); + __asm__ volatile("mov %%cr2, %0" : "=r"(cr2)); if (!load_page((void *)cr2)) return; } @@ -182,13 +203,15 @@ void idt_exception_handler(uint64_t exception, uint64_t code, struct isr_regs *s } } -void idt_pic_eoi(uint8_t exception) { +void idt_pic_eoi(uint8_t exception) +{ pic_eoi(exception - PIC_REMAP_OFFSET); } int counter = 0; -void idt_pic_timer(void) { +void idt_pic_timer(void) +{ // print a message once we know the timer works // but avoid spamming the logs if (counter == 3) { @@ -199,6 +222,10 @@ void idt_pic_timer(void) { } } -void idt_pic_keyboard(void) {} +void idt_pic_keyboard(void) +{ +} -void idt_pic_mouse(void) {} +void idt_pic_mouse(void) +{ +} |