Implemented ISRs
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lucic71
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0b6674afdb
commit
1c7483925c
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#include "isr.h"
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#include "idt.h"
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#include "types/idt_types.h"
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#include "types/isr_types.h"
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#include <stdio.h>
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#include <stdint.h>
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/* Extern symbol defined in idt.c */
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extern idt_entry_t idt_entries[256];
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/* External Interrupt Service Routines. */
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extern void isr0();
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extern void isr1();
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extern void isr2();
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extern void isr3();
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extern void isr4();
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extern void isr5();
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extern void isr6();
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extern void isr7();
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extern void isr8();
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extern void isr9();
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extern void isr10();
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extern void isr11();
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extern void isr12();
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extern void isr13();
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extern void isr14();
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extern void isr15();
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extern void isr16();
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extern void isr17();
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extern void isr18();
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extern void isr19();
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extern void isr20();
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extern void isr21();
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extern void isr22();
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extern void isr23();
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extern void isr24();
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extern void isr25();
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extern void isr26();
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extern void isr27();
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extern void isr28();
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extern void isr29();
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extern void isr30();
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extern void isr31();
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/*
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* isr_init:
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* ---------
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*
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* Fill the first 32 entries in IDT.
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*
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*/
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void isr_init(void) {
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idt_entries[0] = idt_set_gate((uint32_t) isr0, 0x08, 0x8E);
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idt_entries[1] = idt_set_gate((uint32_t) isr1, 0x08, 0x8E);
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idt_entries[2] = idt_set_gate((uint32_t) isr2, 0x08, 0x8E);
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idt_entries[3] = idt_set_gate((uint32_t) isr3, 0x08, 0x8E);
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idt_entries[4] = idt_set_gate((uint32_t) isr4, 0x08, 0x8E);
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idt_entries[5] = idt_set_gate((uint32_t) isr5, 0x08, 0x8E);
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idt_entries[6] = idt_set_gate((uint32_t) isr6, 0x08, 0x8E);
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idt_entries[7] = idt_set_gate((uint32_t) isr7, 0x08, 0x8E);
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idt_entries[8] = idt_set_gate((uint32_t) isr8, 0x08, 0x8E);
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idt_entries[9] = idt_set_gate((uint32_t) isr9, 0x08, 0x8E);
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idt_entries[10] = idt_set_gate( (uint32_t) isr10, 0x08, 0x8E);
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idt_entries[11] = idt_set_gate( (uint32_t) isr11, 0x08, 0x8E);
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idt_entries[12] = idt_set_gate( (uint32_t) isr12, 0x08, 0x8E);
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idt_entries[13] = idt_set_gate( (uint32_t) isr13, 0x08, 0x8E);
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idt_entries[14] = idt_set_gate( (uint32_t) isr14, 0x08, 0x8E);
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idt_entries[15] = idt_set_gate( (uint32_t) isr15, 0x08, 0x8E);
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idt_entries[16] = idt_set_gate( (uint32_t) isr16, 0x08, 0x8E);
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idt_entries[17] = idt_set_gate( (uint32_t) isr17, 0x08, 0x8E);
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idt_entries[18] = idt_set_gate( (uint32_t) isr18, 0x08, 0x8E);
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idt_entries[19] = idt_set_gate( (uint32_t) isr19, 0x08, 0x8E);
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idt_entries[20] = idt_set_gate( (uint32_t) isr20, 0x08, 0x8E);
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idt_entries[21] = idt_set_gate( (uint32_t) isr21, 0x08, 0x8E);
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idt_entries[22] = idt_set_gate( (uint32_t) isr22, 0x08, 0x8E);
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idt_entries[23] = idt_set_gate( (uint32_t) isr23, 0x08, 0x8E);
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idt_entries[24] = idt_set_gate( (uint32_t) isr24, 0x08, 0x8E);
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idt_entries[25] = idt_set_gate( (uint32_t) isr25, 0x08, 0x8E);
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idt_entries[26] = idt_set_gate( (uint32_t) isr26, 0x08, 0x8E);
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idt_entries[27] = idt_set_gate( (uint32_t) isr27, 0x08, 0x8E);
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idt_entries[28] = idt_set_gate( (uint32_t) isr28, 0x08, 0x8E);
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idt_entries[29] = idt_set_gate( (uint32_t) isr29, 0x08, 0x8E);
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idt_entries[30] = idt_set_gate( (uint32_t) isr30, 0x08, 0x8E);
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idt_entries[31] = idt_set_gate( (uint32_t) isr31, 0x08, 0x8E);
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}
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/* Exception messages for unhandled faults. */
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char *exception_messages[] = {
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"Division by zero",
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"Debug",
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"Non-maskable interrupt",
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"Breakpoint",
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"Detected overflow",
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"Out-of-bounds",
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"Invalid opcode",
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"No coprocessor",
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"Double fault",
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"Coprocessor segment overrun",
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"Bad TSS",
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"Segment not present",
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"Stack fault",
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"General protection fault",
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"Page fault",
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"Unknown interrupt",
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"Coprocessor fault",
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"Alignment check",
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"Machine check",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved",
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"Reserved"
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};
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/* isr_handler:
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* Handles an incomming request by calling the appropiate handler or printing
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* an exception message.
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*
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* @param context - the context of the caller
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*
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*/
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void isr_handler(register_t context) {
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printf("Unhandled exception: %s\n", exception_messages[context.int_no]);
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}
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@ -0,0 +1,13 @@
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#ifndef TABLES_ISR_H_
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#define TABLES_ISR_H_
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/*
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* isr_init:
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* Fills the first 32 entries in IDT after it was loaded with the predefined
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* faults and interrupts.
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*
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*/
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void isr_init(void);
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#endif
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.extern isr_handler
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/* Macros that define the entry point in ISRs with and without an error code. */
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.macro ISR_NO_ERRCODE _isr_nr
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.global isr\_isr_nr
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isr\_isr_nr:
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cli
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push $0x00
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push $\_isr_nr
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jmp isr_common_stub
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.endm
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.macro ISR_ERRCODE _isr_nr
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.global isr\_isr_nr
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isr\_isr_nr:
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cli
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push $\_isr_nr
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jmp isr_common_stub
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.endm
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/* Expandation of the above mentioned macros. */
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ISR_NO_ERRCODE 0
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ISR_NO_ERRCODE 1
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ISR_NO_ERRCODE 2
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ISR_NO_ERRCODE 3
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ISR_NO_ERRCODE 4
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ISR_NO_ERRCODE 5
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ISR_NO_ERRCODE 6
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ISR_NO_ERRCODE 7
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ISR_ERRCODE 8
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ISR_NO_ERRCODE 9
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ISR_ERRCODE 10
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ISR_ERRCODE 11
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ISR_ERRCODE 12
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ISR_ERRCODE 13
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ISR_ERRCODE 14
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ISR_NO_ERRCODE 15
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ISR_NO_ERRCODE 16
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ISR_NO_ERRCODE 17
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ISR_NO_ERRCODE 18
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ISR_NO_ERRCODE 19
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ISR_NO_ERRCODE 20
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ISR_NO_ERRCODE 21
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ISR_NO_ERRCODE 22
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ISR_NO_ERRCODE 23
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ISR_NO_ERRCODE 24
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ISR_NO_ERRCODE 25
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ISR_NO_ERRCODE 26
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ISR_NO_ERRCODE 27
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ISR_NO_ERRCODE 28
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ISR_NO_ERRCODE 29
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ISR_NO_ERRCODE 30
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ISR_NO_ERRCODE 31
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/*
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* Stub for ISRs. It must push the context on the stack and change the PL.
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* After the isr_handler was called the context will be restored and the
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* error code and the request number will be cleared from the stack.
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*
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*/
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isr_common_stub:
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pusha
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mov %ds, %ax
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push %eax
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mov $0x10, %ax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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call isr_handler
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pop %eax
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mov %ax, %ds
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mov %ax, %es
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mov %ax, %fs
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mov %ax, %gs
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popa
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add $0x08, %esp
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sti
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iret
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@ -0,0 +1,19 @@
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#ifndef TABLES_ISR_TYPES_H_
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#define TABLES_ISR_TYPES_H_
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#include "stdint.h"
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/* register_t - data type containg the context before calling an ISR. */
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struct registers {
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uint32_t ds;
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uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;
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uint32_t int_no, err_code;
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uint32_t eip, cs, eflags, useresp, ss;
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} __attribute__((packed));
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typedef struct registers register_t;
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#endif
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