71 lines
3.2 KiB
C
71 lines
3.2 KiB
C
#include <system.h>
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#include "isrs.h"
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#include "../idt/idt.h"
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extern void _STOP_ERROR_SCREEN(ISR_stack_regs *);
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/* This is a very repetitive function... it's not hard, it's
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* just annoying. As you can see, we set the first 32 entries
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* in the IDT to the first 32 ISRs. We can't use a for loop
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* for this, because there is no way to get the function names
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* that correspond to that given entry. We set the access
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* flags to 0x8E. This means that the entry is present, is
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* running in ring 0 (kernel level), and has the lower 5 bits
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* set to the required '14', which is represented by 'E' in
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* hex. */
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void i86_isrs_install()
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{
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i86_idt_set_gate(0, (unsigned)i86_isr0, 0x08, 0x8E);
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i86_idt_set_gate(1, (unsigned)i86_isr1, 0x08, 0x8E);
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i86_idt_set_gate(2, (unsigned)i86_isr2, 0x08, 0x8E);
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i86_idt_set_gate(3, (unsigned)i86_isr3, 0x08, 0x8E);
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i86_idt_set_gate(4, (unsigned)i86_isr4, 0x08, 0x8E);
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i86_idt_set_gate(5, (unsigned)i86_isr5, 0x08, 0x8E);
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i86_idt_set_gate(6, (unsigned)i86_isr6, 0x08, 0x8E);
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i86_idt_set_gate(7, (unsigned)i86_isr7, 0x08, 0x8E);
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i86_idt_set_gate(8, (unsigned)i86_isr8, 0x08, 0x8E);
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i86_idt_set_gate(9, (unsigned)i86_isr9, 0x08, 0x8E);
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i86_idt_set_gate(10, (unsigned)i86_isr10, 0x08, 0x8E);
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i86_idt_set_gate(11, (unsigned)i86_isr11, 0x08, 0x8E);
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i86_idt_set_gate(12, (unsigned)i86_isr12, 0x08, 0x8E);
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i86_idt_set_gate(13, (unsigned)i86_isr13, 0x08, 0x8E);
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i86_idt_set_gate(14, (unsigned)i86_isr14, 0x08, 0x8E);
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i86_idt_set_gate(15, (unsigned)i86_isr15, 0x08, 0x8E);
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i86_idt_set_gate(16, (unsigned)i86_isr16, 0x08, 0x8E);
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i86_idt_set_gate(17, (unsigned)i86_isr17, 0x08, 0x8E);
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i86_idt_set_gate(18, (unsigned)i86_isr18, 0x08, 0x8E);
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i86_idt_set_gate(19, (unsigned)i86_isr19, 0x08, 0x8E);
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i86_idt_set_gate(20, (unsigned)i86_isr20, 0x08, 0x8E);
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i86_idt_set_gate(21, (unsigned)i86_isr21, 0x08, 0x8E);
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i86_idt_set_gate(22, (unsigned)i86_isr22, 0x08, 0x8E);
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i86_idt_set_gate(23, (unsigned)i86_isr23, 0x08, 0x8E);
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i86_idt_set_gate(24, (unsigned)i86_isr24, 0x08, 0x8E);
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i86_idt_set_gate(25, (unsigned)i86_isr25, 0x08, 0x8E);
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i86_idt_set_gate(26, (unsigned)i86_isr26, 0x08, 0x8E);
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i86_idt_set_gate(27, (unsigned)i86_isr27, 0x08, 0x8E);
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i86_idt_set_gate(28, (unsigned)i86_isr28, 0x08, 0x8E);
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i86_idt_set_gate(29, (unsigned)i86_isr29, 0x08, 0x8E);
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i86_idt_set_gate(30, (unsigned)i86_isr30, 0x08, 0x8E);
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i86_idt_set_gate(31, (unsigned)i86_isr31, 0x08, 0x8E);
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}
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/* All of our Exception handling Interrupt Service Routines will
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* point to this function. This will tell us what exception has
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* happened! Right now, we simply halt the system by hitting an
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* endless loop. All ISRs disable interrupts while they are being
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* serviced as a 'locking' mechanism to prevent an IRQ from
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* happening and messing up kernel data structures */
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void i86_fault_handler(ISR_stack_regs *r)
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{
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/* Is this a fault whose number is from 0 to 31? */
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if (r->int_no < 32)
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{
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_STOP_ERROR_SCREEN(r);
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/* Display the description for the Exception that occurred.*/
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/* Put on the BSOD screen*/
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for (;;);
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}
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}
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