void init_idt()
{
int i;
const static int_handler handlers[16] = {
divide_error,
single_step_exception,
nmi,
breakpoint_exception,
overflow,
bounds_check,
inval_opcode,
copr_not_available,
double_fault,
copr_seg_overrun,
inval_tss,
segment_not_present,
stack_exception,
general_protection,
page_fault,
copr_error
};
for(i = 0; i <= 14; ++i) {
init_idt_desc(i, DA_386IGate,
handlers[i], PRIVILEGE_KRNL);
}
init_idt_desc(16, DA_386IGate,
handlers[15], PRIVILEGE_KRNL);
for(i = 0x20; i < IDTSIZE; ++i) {
init_idt_desc(i, DA_386IGate,
hwint00, PRIVILEGE_KRNL);
}
u16* p_idt_limit = (u16*)(&g_idt_ptr[0]);
u32* p_idt_base = (u32*)(&g_idt_ptr[2]);
*p_idt_limit = IDTSIZE * sizeof(gate) - 1;
*p_idt_base = (u32)&g_idt;
load_idt(g_idt_ptr);
}
void idt_loader::init_idt(void)
{
int i;
// Initialisation des descripteurs systeme par defaut
for (i = 0; i < IDTSIZE; i++)
init_idt_desc(0x08, (u32) _asm_default_int, INTGATE, &kidt[i]);
init_idt_desc(0x08, (u32) _asm_irq_0, INTGATE, &kidt[32]); // horloge
init_idt_desc(0x08, (u32) _asm_irq_1, INTGATE, &kidt[33]); // clavier
// Initialisation de la structure pour IDTR
kidtr.limite = IDTSIZE * 8;
kidtr.base = IDTBASE;
// Recopie de la IDT a son adresse
memcpy((char *) kidtr.base, (char *) kidt, kidtr.limite);
// Chargement du registre IDT
ext_kidtr = kidtr;
asm("lidtl (ext_kidtr)");
}
/*
* Cette fonction initialise la IDT apres que le kernel soit charge
* en memoire.
*/
void init_idt(void) {
idtdesc desc;
int i;
/* initialisation des descripteurs systeme */
for(i=0;i<IDTSIZE;i++) {
init_idt_desc(default_int, 0x08, INTGATE, &desc);
add_idt_desc(desc);
}
init_idt_desc(k_int0, 0x08, INTGATE, &kidt[0]);
init_idt_desc(k_int1, 0x08, INTGATE, &kidt[1]);
init_idt_desc(k_int2, 0x08, INTGATE, &kidt[2]);
init_idt_desc(k_int3, 0x08, INTGATE, &kidt[3]);
init_idt_desc(k_int4, 0x08, INTGATE, &kidt[4]);
init_idt_desc(k_int5, 0x08, INTGATE, &kidt[5]);
init_idt_desc(k_int6, 0x08, INTGATE, &kidt[6]);
init_idt_desc(k_int7, 0x08, INTGATE, &kidt[7]);
init_idt_desc(k_int8, 0x08, INTGATE, &kidt[8]);
init_idt_desc(k_int9, 0x08, INTGATE, &kidt[9]);
init_idt_desc(k_int10, 0x08, INTGATE, &kidt[10]);
init_idt_desc(k_int11, 0x08, INTGATE, &kidt[11]);
init_idt_desc(k_int12, 0x08, INTGATE, &kidt[12]);
init_idt_desc(k_int13, 0x08, INTGATE, &kidt[13]);
init_idt_desc(k_int14, 0x08, INTGATE, &kidt[14]);
init_idt_desc(k_int15, 0x08, INTGATE, &kidt[15]);
init_idt_desc(k_int16, 0x08, INTGATE, &kidt[16]);
init_idt_desc(k_int17, 0x08, INTGATE, &kidt[17]);
init_idt_desc(k_int18, 0x08, INTGATE, &kidt[18]);
init_idt_desc(k_irq0, 0x08, INTGATE, &kidt[32]);
init_idt_desc(k_irq1, 0x08, INTGATE, &kidt[33]);
init_idt_desc(k_irq2, 0x08, INTGATE, &kidt[34]);
init_idt_desc(k_irq3, 0x08, INTGATE, &kidt[35]);
init_idt_desc(k_irq4, 0x08, INTGATE, &kidt[36]);
init_idt_desc(k_irq5, 0x08, INTGATE, &kidt[37]);
init_idt_desc(k_irq6, 0x08, INTGATE, &kidt[38]);
init_idt_desc(k_irq7, 0x08, INTGATE, &kidt[39]);
init_idt_desc(k_irq8, 0x08, INTGATE, &kidt[40]);
/* initialisation de la structure pour IDTR */
kidtr.limite = IDTSIZE*8;
kidtr.base = IDTBASE;
/* recopie de la IDT a son adresse */
memcopy(kidt, kidtr.base, kidtr.limite);
/* chargement du registre IDTR */
asm("lidtl (kidtr)");
}
void
init_port(void)
{
init_8259A();
/* all initialize as interrupt gate */
init_idt_desc(INT_VECTOR_DIVIDE, DA_386IGATE,
divide_error, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_DEBUG, DA_386IGATE,
single_step_exception, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_NMI, DA_386IGATE,
nmi, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_BREAKPOINT, DA_386IGATE,
breakpoint_exception, PRIVILEGE_USER);
init_idt_desc(INT_VECTOR_OVERFLOW, DA_386IGATE,
overflow, PRIVILEGE_USER);
init_idt_desc(INT_VECTOR_BOUNDS, DA_386IGATE,
bounds_check, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_INVAL_OP, DA_386IGATE,
inval_opcode, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_COPROC_NOT, DA_386IGATE,
copr_not_available, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_DOUBLE_FAULT, DA_386IGATE,
double_fault, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_COPROC_SEG, DA_386IGATE,
copr_seg_overrun, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_INVAL_TSS, DA_386IGATE,
inval_tss, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_SEG_NOT, DA_386IGATE,
segment_not_present, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_STACK_FAULT, DA_386IGATE,
stack_exception, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_PROTECTION, DA_386IGATE,
general_protection, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_PAGE_FAULT, DA_386IGATE,
page_fault, PRIVILEGE_KERNAL);
init_idt_desc(INT_VECTOR_COPROC_ERR, DA_386IGATE,
copr_error, PRIVILEGE_KERNAL);
}
/*======================================================================*
init_prot
*----------------------------------------------------------------------*
* 作用：初始化IDT和8529
*======================================================================*/
PUBLIC void init_prot()
{
init_8259A();
// 全部初始化成中断门(没有陷阱门)
init_idt_desc(INT_VECTOR_DIVIDE, DA_386IGate, divide_error, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DEBUG, DA_386IGate, single_step_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_NMI, DA_386IGate, nmi, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_BREAKPOINT, DA_386IGate, breakpoint_exception, PRIVILEGE_USER);
init_idt_desc(INT_VECTOR_OVERFLOW, DA_386IGate, overflow, PRIVILEGE_USER);
init_idt_desc(INT_VECTOR_BOUNDS, DA_386IGate, bounds_check, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_OP, DA_386IGate, inval_opcode, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_NOT, DA_386IGate, copr_not_available, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DOUBLE_FAULT, DA_386IGate, double_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_SEG, DA_386IGate, copr_seg_overrun, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_TSS, DA_386IGate, inval_tss, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_SEG_NOT, DA_386IGate, segment_not_present, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_STACK_FAULT, DA_386IGate, stack_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PROTECTION, DA_386IGate, general_protection, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PAGE_FAULT, DA_386IGate, page_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_ERR, DA_386IGate, copr_error, PRIVILEGE_KRNL);
// Master 8529A产生的中断
init_idt_desc(INT_VECTOR_IRQ0 + 0, DA_386IGate, hwint00, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 1, DA_386IGate, hwint01, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 2, DA_386IGate, hwint02, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 3, DA_386IGate, hwint03, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 4, DA_386IGate, hwint04, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 5, DA_386IGate, hwint05, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 6, DA_386IGate, hwint06, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 7, DA_386IGate, hwint07, PRIVILEGE_KRNL);
// Slave 8529A产生的中断
init_idt_desc(INT_VECTOR_IRQ8 + 0, DA_386IGate, hwint08, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 1, DA_386IGate, hwint09, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 2, DA_386IGate, hwint10, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 3, DA_386IGate, hwint11, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 4, DA_386IGate, hwint12, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 5, DA_386IGate, hwint13, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 6, DA_386IGate, hwint14, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 7, DA_386IGate, hwint15, PRIVILEGE_KRNL);
}
/*======================================================================*
init_prot
*----------------------------------------------------------------------*
初始化 IDT
*======================================================================*/
PUBLIC void
init_prot ()
{
init_8259A ();
// 全部初始化成中断门(没有陷阱门)
init_idt_desc (INT_VECTOR_DIVIDE, DA_386IGate,
divide_error, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_DEBUG, DA_386IGate,
single_step_exception, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_NMI, DA_386IGate, nmi, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_BREAKPOINT, DA_386IGate,
breakpoint_exception, PRIVILEGE_USER);
init_idt_desc (INT_VECTOR_OVERFLOW, DA_386IGate, overflow, PRIVILEGE_USER);
init_idt_desc (INT_VECTOR_BOUNDS, DA_386IGate,
bounds_check, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_INVAL_OP, DA_386IGate,
inval_opcode, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_COPROC_NOT, DA_386IGate,
copr_not_available, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_DOUBLE_FAULT, DA_386IGate,
double_fault, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_COPROC_SEG, DA_386IGate,
copr_seg_overrun, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_INVAL_TSS, DA_386IGate,
inval_tss, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_SEG_NOT, DA_386IGate,
segment_not_present, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_STACK_FAULT, DA_386IGate,
stack_exception, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_PROTECTION, DA_386IGate,
general_protection, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_PAGE_FAULT, DA_386IGate,
page_fault, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_COPROC_ERR, DA_386IGate,
copr_error, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 0, DA_386IGate, hwint00, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 1, DA_386IGate, hwint01, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 2, DA_386IGate, hwint02, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 3, DA_386IGate, hwint03, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 4, DA_386IGate, hwint04, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 5, DA_386IGate, hwint05, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 6, DA_386IGate, hwint06, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ0 + 7, DA_386IGate, hwint07, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 0, DA_386IGate, hwint08, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 1, DA_386IGate, hwint09, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 2, DA_386IGate, hwint10, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 3, DA_386IGate, hwint11, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 4, DA_386IGate, hwint12, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 5, DA_386IGate, hwint13, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 6, DA_386IGate, hwint14, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_IRQ8 + 7, DA_386IGate, hwint15, PRIVILEGE_KRNL);
init_idt_desc (INT_VECTOR_SYS_CALL, DA_386IGate, sys_call, PRIVILEGE_USER);
/* 填充 GDT 中 TSS 这个描述符 */
memset (&tss, 0, sizeof (tss));
tss.ss0 = SELECTOR_KERNEL_DS;
init_descriptor (&gdt[INDEX_TSS],
vir2phys (seg2phys (SELECTOR_KERNEL_DS), &tss),
sizeof (tss) - 1, DA_386TSS);
tss.iobase = sizeof (tss); /* 没有I/O许可位图 */
// 填充 GDT 中进程的 LDT 的描述符
int i;
PROCESS *p_proc = proc_table;
u16 selector_ldt = INDEX_LDT_FIRST << 3;
for (i = 0; i < NR_TASKS; i++)
{
init_descriptor (&gdt[selector_ldt >> 3],
vir2phys (seg2phys (SELECTOR_KERNEL_DS),
proc_table[i].ldts),
LDT_SIZE * sizeof (DESCRIPTOR) - 1, DA_LDT);
p_proc++;
selector_ldt += 1 << 3;
}
}
PUBLIC void init_prot()
{
init_8259A();
/* 全部初始化为中断门 */
init_idt_desc(INT_VECTOR_DIVIDE, DA_386IGate, divide_error, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DEBUG, DA_386IGate, single_step_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_NMI, DA_386IGate, nmi, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_BREAKPOINT, DA_386IGate, breakpoint_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_OVERFLOW, DA_386IGate, overflow, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_BOUNDS, DA_386IGate, bounds_check, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_OP, DA_386IGate, invalid_opcode, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_NOT, DA_386IGate, copr_not_available, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DOUBLE_FAULT, DA_386IGate, double_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_SEG, DA_386IGate, copr_seg_overrun, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_TSS, DA_386IGate, invalid_tss, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_SEG_NOT, DA_386IGate, segment_not_present, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_STACK_FAULT, DA_386IGate, stack_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PROTECTION, DA_386IGate, general_protection, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PAGE_FAULT, DA_386IGate, page_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_ERR, DA_386IGate, copr_error, PRIVILEGE_KRNL);
}
PUBLIC void init_prot()
{
init_8259A();
/* 全部初始化为中断门 */
init_idt_desc(INT_VECTOR_DIVIDE, DA_386IGate, divide_error, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DEBUG, DA_386IGate, single_step_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_NMI, DA_386IGate, nmi, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_BREAKPOINT, DA_386IGate, breakpoint_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_OVERFLOW, DA_386IGate, overflow, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_BOUNDS, DA_386IGate, bounds_check, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_OP, DA_386IGate, invalid_opcode, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_NOT, DA_386IGate, copr_not_available, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_DOUBLE_FAULT, DA_386IGate, double_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_SEG, DA_386IGate, copr_seg_overrun, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_INVAL_TSS, DA_386IGate, invalid_tss, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_SEG_NOT, DA_386IGate, segment_not_present, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_STACK_FAULT, DA_386IGate, stack_exception, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PROTECTION, DA_386IGate, general_protection, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_PAGE_FAULT, DA_386IGate, page_fault, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_COPROC_ERR, DA_386IGate, copr_error, PRIVILEGE_KRNL);
/* 初始化8259A的处理程序 */
init_idt_desc(INT_VECTOR_IRQ0 + 0, DA_386IGate, hwint_00, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 1, DA_386IGate, hwint_01, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 2, DA_386IGate, hwint_02, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 3, DA_386IGate, hwint_03, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 4, DA_386IGate, hwint_04, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 5, DA_386IGate, hwint_05, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 6, DA_386IGate, hwint_06, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ0 + 7, DA_386IGate, hwint_07, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 0, DA_386IGate, hwint_08, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 1, DA_386IGate, hwint_09, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 2, DA_386IGate, hwint_10, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 3, DA_386IGate, hwint_11, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 4, DA_386IGate, hwint_12, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 5, DA_386IGate, hwint_13, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 6, DA_386IGate, hwint_14, PRIVILEGE_KRNL);
init_idt_desc(INT_VECTOR_IRQ8 + 7, DA_386IGate, hwint_15, PRIVILEGE_KRNL);
}
