54 lines
879 B
C
54 lines
879 B
C
#include <system.h>
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/*
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* IDT Entry
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*/
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struct idt_entry {
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unsigned short base_low;
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unsigned short sel;
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unsigned char zero;
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unsigned char flags;
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unsigned short base_high;
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} __attribute__((packed));
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struct idt_ptr {
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unsigned short limit;
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unsigned int base;
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} __attribute__((packed));
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struct idt_entry idt[256];
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struct idt_ptr idtp;
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extern void idt_load();
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/*
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* idt_set_gate
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* Set an IDT gate
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*/
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void
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set_idt_gate(
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unsigned char num,
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unsigned long base,
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unsigned short sel,
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unsigned char flags
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) {
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idt[num].base_low = (base & 0xFFFF);
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idt[num].base_high = (base >> 16) & 0xFFFF;
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idt[num].sel = sel;
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idt[num].zero = 0;
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idt[num].flags = flags;
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}
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/*
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* idt_install
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* Install the IDTs
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*/
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void
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idt_install() {
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idtp.limit = (sizeof(struct idt_entry) * 256) - 1;
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idtp.base = &idt;
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memset(&idt, 0, sizeof(struct idt_entry) * 256);
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idt_load();
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}
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