e4cc638a8d
This commit adds GDT initialization with proper code/data segments and reloads CS. It also adds the initial IDT structure and loads an empty IDT. Build configuration updated to disable SSE/MMX to prevent compiler generation of unsupported instructions in early boot.
34 lines
1.1 KiB
C
34 lines
1.1 KiB
C
#ifndef IDT_H
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#define IDT_H
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#include <stdint.h>
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/* A struct describing an interrupt gate. */
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struct idt_entry_struct {
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uint16_t base_lo; // The lower 16 bits of the address to jump to when this interrupt fires.
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uint16_t sel; // Kernel segment selector.
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uint8_t always0; // This must always be zero.
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uint8_t flags; // More flags. See documentation.
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uint16_t base_hi; // The upper 16 bits of the address to jump to.
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} __attribute__((packed));
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typedef struct idt_entry_struct idt_entry_t;
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/* A struct describing a pointer to an array of interrupt handlers.
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* This is in a format suitable for giving to 'lidt'. */
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struct idt_ptr_struct {
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uint16_t limit;
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uint32_t base; // The address of the first element in our idt_entry_t array.
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} __attribute__((packed));
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typedef struct idt_ptr_struct idt_ptr_t;
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// These extern directives let us access the addresses of our ASM ISR handlers.
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extern void isr0();
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extern void isr1();
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// ... we will add more later ...
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void init_idt();
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#endif
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