void install_keyboard_handler()
{
struct x86_gate *idt = (struct x86_gate *) sidt();
fill_gate(idt[KEY_IDT_ENTRY].filler, (unsigned int) asm_keyboard_wrapper, KERNEL_CS_SEGSEL, ACC_TRAP_GATE);
init_kb_buffer();
}
void install_timer_handler()
{
struct x86_gate *idt = (struct x86_gate *) sidt();
fill_gate(idt[TIMER_IDT_ENTRY].filler, (unsigned int) asm_timer_wrapper, KERNEL_CS_SEGSEL, ACC_TRAP_GATE);
outb(TIMER_MODE_IO_PORT, TIMER_SQUARE_WAVE);
outb(TIMER_PERIOD_IO_PORT, ((TIMER_RATE / 100) & 0xff));
iodelay();
outb(TIMER_PERIOD_IO_PORT, (((TIMER_RATE / 100) >> 8) & 0xff));
}
/*
* Init the VM code.
*/
void
oskit_uvm_redzone_init(void)
{
oskit_addr_t addr;
/*
* We use a task gate to catch page faults, since a stack overflow
* will try and dump more stuff on the stack. This is the easiest
* way to deal with it.
*/
if ((addr = (oskit_addr_t)
lmm_alloc_aligned(&malloc_lmm, STACKSIZE, 0, 12, 0)) == 0)
panic(__FUNCTION__": Could not allocate stack\n");
task_tss.ss0 = KERNEL_DS;
task_tss.esp0 = addr + STACKSIZE - sizeof(double);
task_tss.esp = task_tss.esp0;
task_tss.ss = KERNEL_DS;
task_tss.ds = KERNEL_DS;
task_tss.es = KERNEL_DS;
task_tss.fs = KERNEL_DS;
task_tss.gs = KERNEL_DS;
task_tss.cs = KERNEL_CS;
task_tss.io_bit_map_offset = sizeof(task_tss);
task_tss.eip = (int) double_fault_handler;
/* Make sure the task is started with interrupts disabled */
osenv_intr_disable();
task_tss.eflags = (int) get_eflags();
osenv_intr_enable();
/* Both TSSs has to know about the page tables */
task_tss.cr3 = get_cr3();
base_tss.cr3 = get_cr3();
/* Initialize the base TSS descriptor. */
fill_descriptor(&base_gdt[KERNEL_TRAP_TSS / 8],
kvtolin(&task_tss), sizeof(task_tss) - 1,
ACC_PL_K|ACC_TSS|ACC_P, 0);
/*
* NOTE: The task switch will include an extra word on the stack,
* pushed by the CPU. The handler will need to be in assembly code
* if we care about that value. As it is, the handler routine
* stack is going to be slightly messed up, but since the handler
* calls panic, it is not a problem right now.
*/
fill_gate(&base_idt[T_DOUBLE_FAULT],
0, KERNEL_TRAP_TSS, ACC_TASK_GATE|ACC_P|ACC_PL_K, 0);
base_idt_load();
base_gdt_load();
}
void SetIDTEntry(int entry_num, func_ptr_t entry_addr){
struct i386_gate *gateptr = &idt_table[entry_num];
fill_gate(gateptr, (int)entry_addr, get_cs(), ACC_INTR_GATE,0);
}
void SetEntry(int entry_num, func_ptr_t func_ptr) {
struct i386_gate *gateptr = &IDT_ptr[entry_num];
fill_gate(gateptr, (int) func_ptr, get_cs(), ACC_INTR_GATE,0);
}