idt.c

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#include <slibc.h>
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stddef.h>

#include <segment.h>
#include <idt.h>

#define INSTALL_ISR(idt, t, ptr) do { \
        (idt).p = IDT_SEGMENT_PRESENT; \
        (idt).dpl = IDT_KERNEL; \
        (idt).type = (t); \
        (idt).d = SIZE32; \
        (idt).selector = ((DESC_KERNEL_CS << SIZEOF_A_DESC_BIT) | TI(GDT) | KERNEL); \
        (idt).offset0 = LOW16((unsigned long)ptr); \
        (idt).offset1 = HIGH16((unsigned long)ptr); \
} while (0)

#define INSTALL_USER_ISR(idt, t, ptr) do { \
        (idt).p = IDT_SEGMENT_PRESENT; \
        (idt).dpl = IDT_USER; \
        (idt).type = (t); \
        (idt).d = SIZE32; \
        (idt).selector = ((DESC_KERNEL_CS << SIZEOF_A_DESC_BIT) | TI(GDT) | KERNEL); \
        (idt).offset0 = LOW16((unsigned long)ptr); \
        (idt).offset1 = HIGH16((unsigned long)ptr); \
} while (0)

static struct interrupt_gate s_idt[IDT_MAX_ENTRY];


void isr_div_error(void);
void isr_debug(void);
void isr_nmi(void);

void isr_breakpoint(void);
void isr_overflow(void);
void isr_bound(void);
void isr_invalid_opcode(void);
void isr_device(void);
void isr_double_fault(void);
void isr_coprocessor(void);

void isr_invalid_tss(void);
void isr_seg_not_present(void);
void isr_stack_seg_fault(void);
void isr_general_protection(void);
void isr_page_fault(void);

void isr_math_fault(void);
void isr_alignment_check(void);
void isr_machine_check(void);
void isr_simd_floating(void);

void isr_timer(void);
void isr_keyboard(void);
void isr_irq2(void);
void isr_dummy(void);
void isr_fdc(void);
void isr_rtc(void);
void isr_binder(void);
void isr_hdc(void);
void isr_dummy(void);
void isr_sw(void);

void interrupt_init(void)
{
        struct idtr idtr;

        memset(s_idt, 0, sizeof(s_idt[0]) * IDT_MAX_ENTRY);
        INSTALL_ISR(s_idt[0], TRAP, isr_div_error);
        INSTALL_ISR(s_idt[1], TRAP, isr_debug);
        INSTALL_ISR(s_idt[2], INTERRUPT, isr_nmi);
        INSTALL_ISR(s_idt[3], TRAP, isr_breakpoint);
        INSTALL_ISR(s_idt[4], TRAP, isr_overflow);
        INSTALL_ISR(s_idt[5], TRAP, isr_bound);
        INSTALL_ISR(s_idt[6], TRAP, isr_invalid_opcode);
        INSTALL_ISR(s_idt[7], TRAP, isr_device);
        INSTALL_ISR(s_idt[8], TRAP, isr_double_fault);
        INSTALL_ISR(s_idt[9], TRAP, isr_coprocessor);

        INSTALL_ISR(s_idt[10], TRAP, isr_invalid_tss);
        INSTALL_ISR(s_idt[11], TRAP, isr_seg_not_present);
        INSTALL_ISR(s_idt[12], TRAP, isr_stack_seg_fault);
        INSTALL_ISR(s_idt[13], TRAP, isr_general_protection);
        INSTALL_ISR(s_idt[14], TRAP, isr_page_fault);

        /* 15 */

        INSTALL_ISR(s_idt[16], TRAP, isr_math_fault);
        INSTALL_ISR(s_idt[17], TRAP, isr_alignment_check);
        INSTALL_ISR(s_idt[18], TRAP, isr_machine_check);
        INSTALL_ISR(s_idt[19], TRAP, isr_simd_floating);

        /* 20 ~ 31 reserved */

        /* PIC1 mapped to 32 ~ 40, 34 is IRQ binder -> PIC2 */
        /* IRQ0 Sysmtem Timer */
        INSTALL_ISR(s_idt[32], INTERRUPT, isr_timer);
        /* IRQ1 Keyboard */
        INSTALL_ISR(s_idt[33], INTERRUPT, isr_keyboard);
        /* IRQ2 Redirectd */
        INSTALL_ISR(s_idt[34], INTERRUPT, isr_irq2);
        /* IRQ3 Serial port */
        INSTALL_ISR(s_idt[35], INTERRUPT, isr_dummy);
        /* IRQ4 Serial port */
        INSTALL_ISR(s_idt[36], INTERRUPT, isr_dummy);
        /* IRQ5 Reserved/Soundcard */
        INSTALL_ISR(s_idt[37], INTERRUPT, isr_dummy);
        /* IRQ6 Floppy */
        INSTALL_ISR(s_idt[38], INTERRUPT, isr_fdc);
        /* IRQ7 Parallel */
        INSTALL_ISR(s_idt[39], INTERRUPT, isr_dummy);
        /* IRQ8 RTC */
        INSTALL_ISR(s_idt[40], INTERRUPT, isr_rtc);
        /* IRQ9 Redirectd */
        INSTALL_ISR(s_idt[41], INTERRUPT, isr_binder);
        /* IRQ10 - Reserved */
        INSTALL_ISR(s_idt[42], INTERRUPT, isr_dummy);
        /* IRQ11 - Reserved */
        INSTALL_ISR(s_idt[43], INTERRUPT, isr_dummy);
        /* IRQ12 - Mouse (PS/2) */
        INSTALL_ISR(s_idt[44], INTERRUPT, isr_dummy);
        /* IRQ13 - Math */
        INSTALL_ISR(s_idt[45], INTERRUPT, isr_dummy);
        /* IRQ14 - HDC */
        INSTALL_ISR(s_idt[46], INTERRUPT, isr_hdc);
        /* IRQ15 - Reserved */
        INSTALL_ISR(s_idt[47], INTERRUPT, isr_dummy);
        /* 48 - Reserved */
        INSTALL_USER_ISR(s_idt[49], TRAP, isr_sw);

        idtr.limit = (sizeof(s_idt[0]) << IDT_MAX_BIT) - 1;
        idtr.base = (unsigned long)s_idt;

        asm volatile("lidt (%0)"::"g"(&idtr));
}

/* End of a file */