irq.c

一个用于学习的操作系统

/*文件名: irq.c
  说明:   初始化中断异常
  作者:   marsinfan
  日期:   2005/12/07
*/

#include <fairysky/kernel.h>
#include <asm/system.h>
#include <fairysky/defs.h>
#include <fairysky/param.h>
#include <asm/io.h>

DESCR_INT idt[0x100];           // IDT
static IDTR idtr;                      //IDTR

void do_lidt(IDTR *idtr);
extern  unsigned char exc_has_error[0x20];

#ifdef WINDOWS_CYGWIN
#define DIVIDE_ERROR_INTERRUPT devide_error_interrupt
#define DEBUG_INTERRUPT debug_interrupt
#define NMI_INTERRUPT nmi_interrupt
#define INT3_INTERRUPT int3_interrupt
#define OVERFLOW_INTERRUPT overflow_interrupt
#define BOUNDS_INTERRUPT bounds_interrupt
#define INVALID_OP_INTERRUPT innvalid_opcode_interrupt
#define DEVICE_NOT_AVAILABLE_INTERRUPT device_not_available_interrupt
#define DOUBLE_INTERRUPT double_fault_interrupt
#define COPROCESSOR_SEGMENT_OVERRUN_INTERRUPT coprocessor_segment_overrun_interrupt
#define INVALID_TSS_INTERRUPT invalid_tss_interrupt
#define SEGMENT_NOT_PRESENT_INTERRUPT segment_not_present_interrupt
#define STACK_SEGMENT_INTERRUPT stack_segment_interrupt
#define GENERAL_PROTECTION_INTERRUPT general_protection_interrupt
#define PAGE_FAULT_INTERRUPT page_fault_interrupt
#define ISR_0F_WRAPPER reserved_interrupt
#define COPROCESSOR_ERROR_INTERRUPT coprocessor_error_interrupt
#define ISR_11_WRAPPER isr_11_wrapper
#define ISR_12_WRAPPER isr_12_wrapper
#define ISR_13_WRAPPER isr_13_wrapper
#define ISR_14_WRAPPER isr_14_wrapper
#define ISR_15_WRAPPER isr_15_wrapper
#define ISR_16_WRAPPER isr_16_wrapper
#define ISR_17_WRAPPER isr_17_wrapper
#define ISR_18_WRAPPER isr_18_wrapper
#define ISR_19_WRAPPER isr_19_wrapper
#define ISR_1A_WRAPPER isr_1A_wrapper
#define ISR_1B_WRAPPER isr_1B_wrapper
#define ISR_1C_WRAPPER isr_1C_wrapper
#define ISR_1D_WRAPPER isr_1D_wrapper
#define ISR_1E_WRAPPER isr_1E_wrapper
#define ISR_1F_WRAPPER isr_1F_wrapper
#define TIMER_INTERRUPT timer_interrupt
#define KBD_INTERRUPT kbd_interrupt
#define SYSTEM_CALL system_call_entry
#else
#define DIVIDE_ERROR_INTERRUPT _devide_error_interrupt
#define DEBUG_INTERRUPT _debug_interrupt
#define NMI_INTERRUPT _nmi_interrupt
#define INT3_INTERRUPT _int3_interrupt
#define OVERFLOW_INTERRUPT _overflow_interrupt
#define BOUNDS_INTERRUPT _bounds_interrupt
#define INVALID_OP_INTERRUPT _innvalid_opcode_interrupt
#define DEVICE_NOT_AVAILABLE_INTERRUPT _device_not_available_interrupt
#define DOUBLE_INTERRUPT _double_fault_interrupt
#define COPROCESSOR_SEGMENT_OVERRUN_INTERRUPT _coprocessor_segment_overrun_interrupt
#define INVALID_TSS_INTERRUPT _invalid_tss_interrupt
#define SEGMENT_NOT_PRESENT_INTERRUPT _segment_not_present_interrupt
#define STACK_SEGMENT_INTERRUPT _stack_segment_interrupt
#define GENERAL_PROTECTION_INTERRUPT _general_protection_interrupt
#define PAGE_FAULT_INTERRUPT _page_fault_interrupt
#define ISR_0F_WRAPPER _reserved_interrupt
#define COPROCESSOR_ERROR_INTERRUPT _coprocessor_error_interrupt
#define ISR_11_WRAPPER _isr_11_wrapper
#define ISR_12_WRAPPER _isr_12_wrapper
#define ISR_13_WRAPPER _isr_13_wrapper
#define ISR_14_WRAPPER _isr_14_wrapper
#define ISR_15_WRAPPER _isr_15_wrapper
#define ISR_16_WRAPPER _isr_16_wrapper
#define ISR_17_WRAPPER _isr_17_wrapper
#define ISR_18_WRAPPER _isr_18_wrapper
#define ISR_19_WRAPPER _isr_19_wrapper
#define ISR_1A_WRAPPER _isr_1A_wrapper
#define ISR_1B_WRAPPER _isr_1B_wrapper
#define ISR_1C_WRAPPER _isr_1C_wrapper
#define ISR_1D_WRAPPER _isr_1D_wrapper
#define ISR_1E_WRAPPER _isr_1E_wrapper
#define ISR_1F_WRAPPER _isr_1F_wrapper
#define TIMER_INTERRUPT _timer_interrupt
#define KBD_INTERRUPT _kbd_interrupt
#define SYSTEM_CALL _system_call_entry
#endif

#define interrupt void
interrupt DIVIDE_ERROR_INTERRUPT();
interrupt DEBUG_INTERRUPT();
interrupt NMI_INTERRUPT();
interrupt INT3_INTERRUPT();
interrupt OVERFLOW_INTERRUPT();
interrupt BOUNDS_INTERRUPT();
interrupt INVALID_OP_INTERRUPT();
interrupt DEVICE_NOT_AVAILABLE_INTERRUPT();
interrupt DOUBLE_INTERRUPT();
interrupt COPROCESSOR_SEGMENT_OVERRUN_INTERRUPT();
interrupt INVALID_TSS_INTERRUPT();
interrupt SEGMENT_NOT_PRESENT_INTERRUPT();
interrupt STACK_SEGMENT_INTERRUPT();
interrupt GENERAL_PROTECTION_INTERRUPT();
interrupt PAGE_FAULT_INTERRUPT();
interrupt ISR_0F_WRAPPER();
interrupt COPROCESSOR_ERROR_INTERRUPT();
interrupt ISR_11_WRAPPER();
interrupt ISR_12_WRAPPER();
interrupt ISR_13_WRAPPER();
interrupt ISR_14_WRAPPER();
interrupt ISR_15_WRAPPER();
interrupt ISR_16_WRAPPER();
interrupt ISR_17_WRAPPER();
interrupt ISR_18_WRAPPER();
interrupt ISR_19_WRAPPER();
interrupt ISR_1A_WRAPPER();
interrupt ISR_1B_WRAPPER();
interrupt ISR_1C_WRAPPER();
interrupt ISR_1D_WRAPPER();
interrupt ISR_1E_WRAPPER();
interrupt ISR_1F_WRAPPER();
interrupt TIMER_INTERRUPT();
interrupt KBD_INTERRUPT();
interrupt SYSTEM_CALL();

//设置中断描述附
void setup_IDT_entry(DESCR_INT *item,
                     u16 selector,
                     u32 offset,
                     u8 access,
                     u8 param_cnt)
{
    item->offset_l = offset & 0xFFFF;
    item->selector = selector;
    item->param_cnt = param_cnt;
    item->access = access;
    item->offset_h = offset >> 16;
}

//#define set_trap_gate(index, fun_addr)    \
//    setup_IDT_entry(&idt[index], 0x08, (u32) & fun_addr, ACS_INT, 0)

#define set_system_gate(index, fun_addr)    \
    setup_IDT_entry(&idt[index], 0x08, (u32) & fun_addr, ACS_TRAP | ACS_DPL_3, 0)


#define LATCH (1193180 / HZ)

//初始化异常、系统调用等中断处理程序
void init_irq(void)
{
    set_trap_gate(0x00, DIVIDE_ERROR_INTERRUPT);
    set_trap_gate(0x01, DEBUG_INTERRUPT);
    set_trap_gate(0x02, NMI_INTERRUPT);
    set_system_gate(0x03, INT3_INTERRUPT);
    set_system_gate(0x04, OVERFLOW_INTERRUPT);
    set_system_gate(0x05, BOUNDS_INTERRUPT);
    set_trap_gate(0x06, INVALID_OP_INTERRUPT);
    set_trap_gate(0x07, DEVICE_NOT_AVAILABLE_INTERRUPT);
    set_trap_gate(0x08, DOUBLE_INTERRUPT);
    set_trap_gate(0x09, COPROCESSOR_SEGMENT_OVERRUN_INTERRUPT);
    set_trap_gate(0x0A, INVALID_TSS_INTERRUPT);
    set_trap_gate(0x0B, SEGMENT_NOT_PRESENT_INTERRUPT);
    set_trap_gate(0x0C, STACK_SEGMENT_INTERRUPT);
    set_trap_gate(0x0D, GENERAL_PROTECTION_INTERRUPT);
    set_trap_gate(0x0E, PAGE_FAULT_INTERRUPT);
    set_trap_gate(0x0F, ISR_0F_WRAPPER);
    set_trap_gate(0x10, COPROCESSOR_ERROR_INTERRUPT);
    set_trap_gate(0x11, ISR_11_WRAPPER);
    set_trap_gate(0x12, ISR_12_WRAPPER);
    set_trap_gate(0x13, ISR_13_WRAPPER);
    set_trap_gate(0x14, ISR_14_WRAPPER);
    set_trap_gate(0x15, ISR_15_WRAPPER);
    set_trap_gate(0x16, ISR_16_WRAPPER);
    set_trap_gate(0x17, ISR_17_WRAPPER);
    set_trap_gate(0x18, ISR_18_WRAPPER);
    set_trap_gate(0x19, ISR_19_WRAPPER);
    set_trap_gate(0x1A, ISR_1A_WRAPPER);
    set_trap_gate(0x1B, ISR_1B_WRAPPER);
    set_trap_gate(0x1C, ISR_1C_WRAPPER);
    set_trap_gate(0x1D, ISR_1D_WRAPPER);
    set_trap_gate(0x1E, ISR_1E_WRAPPER);
    set_trap_gate(0x1F, ISR_1F_WRAPPER);

    set_trap_gate(0x20, TIMER_INTERRUPT);
    set_trap_gate(0x21, KBD_INTERRUPT);

    set_system_gate(0x80, SYSTEM_CALL);//系统调用入口

    idtr.limit = sizeof(idt) - 1;
    idtr.base = ((u32) idt);
    lidt(&idtr);//设置lidt

    outb_p(0x36, 0x43);             /* binary, mode 3, LSB/MSB, ch 0 */
    outb_p(LATCH & 0xff, 0x40); /* LSB */
    outb(LATCH >> 8, 0x40);     /* MSB *///初始化始终中断频率
}