// Initialize and load the IDT.
void setup_idt (void)
{
idt_ptr.size = (sizeof (idt_entry) * 256) - 1;
idt_ptr.address = (uint32_t) &idt;
set_idt_entry (0, (uint32_t) &exc0);
set_idt_entry (1, (uint32_t) &exc1);
set_idt_entry (2, (uint32_t) &exc2);
set_idt_entry (3, (uint32_t) &exc3);
set_idt_entry (4, (uint32_t) &exc4);
set_idt_entry (5, (uint32_t) &exc5);
set_idt_entry (6, (uint32_t) &exc6);
set_idt_entry (7, (uint32_t) &exc7);
set_idt_entry (8, (uint32_t) &exc8);
set_idt_entry (9, (uint32_t) &exc9);
set_idt_entry (10, (uint32_t) &exc10);
set_idt_entry (11, (uint32_t) &exc11);
set_idt_entry (12, (uint32_t) &exc12);
set_idt_entry (13, (uint32_t) &exc13);
set_idt_entry (14, (uint32_t) &exc14);
set_idt_entry (15, (uint32_t) &exc15);
set_idt_entry (16, (uint32_t) &exc16);
set_idt_entry (17, (uint32_t) &exc17);
set_idt_entry (18, (uint32_t) &exc18);
set_idt_entry (19, (uint32_t) &exc19);
set_idt_entry (20, (uint32_t) &exc20);
set_idt_entry (21, (uint32_t) &exc21);
set_idt_entry (22, (uint32_t) &exc22);
set_idt_entry (23, (uint32_t) &exc23);
set_idt_entry (24, (uint32_t) &exc24);
set_idt_entry (25, (uint32_t) &exc25);
set_idt_entry (26, (uint32_t) &exc26);
set_idt_entry (27, (uint32_t) &exc27);
set_idt_entry (28, (uint32_t) &exc28);
set_idt_entry (29, (uint32_t) &exc29);
set_idt_entry (30, (uint32_t) &exc30);
set_idt_entry (31, (uint32_t) &exc31);
remap_pics ();
set_idt_entry (32, (uint32_t) &irq0);
set_idt_entry (33, (uint32_t) &irq1);
set_idt_entry (34, (uint32_t) &irq2);
set_idt_entry (35, (uint32_t) &irq3);
set_idt_entry (36, (uint32_t) &irq4);
set_idt_entry (37, (uint32_t) &irq5);
set_idt_entry (38, (uint32_t) &irq6);
set_idt_entry (39, (uint32_t) &irq7);
set_idt_entry (40, (uint32_t) &irq8);
set_idt_entry (41, (uint32_t) &irq9);
set_idt_entry (42, (uint32_t) &irq10);
set_idt_entry (43, (uint32_t) &irq11);
set_idt_entry (44, (uint32_t) &irq12);
set_idt_entry (45, (uint32_t) &irq13);
set_idt_entry (46, (uint32_t) &irq14);
set_idt_entry (47, (uint32_t) &irq15);
load_idt ();
}
// This function must be called before doing anything with IRQs.
// It remaps the PIC and sets up the ISRs for IRQs 1-15(IRQ 0
// is handled by the task scheduler).
void setup_irqs()
{
k_printf("\nSetting up IRQs...\n");
k_printf("Remapping the PIC... ");
remap_pics(0x40, 0x48);
k_printf("completed\n");
k_printf("Masking all IRQs... ");
mask_irq(0);
mask_irq(1);
mask_irq(2);
mask_irq(3);
mask_irq(4);
mask_irq(5);
mask_irq(6);
mask_irq(7);
mask_irq(8);
mask_irq(9);
mask_irq(10);
mask_irq(11);
mask_irq(12);
mask_irq(13);
mask_irq(14);
mask_irq(15);
k_printf("completed\n");
k_printf("Installing ISRs for IRQs 1-15... ");
modify_gate_address((u_long)&irq_watcher_1, 0x41, 0);
modify_gate_address((u_long)&irq_watcher_2, 0x42, 0);
modify_gate_address((u_long)&irq_watcher_3, 0x43, 0);
modify_gate_address((u_long)&irq_watcher_4, 0x44, 0);
modify_gate_address((u_long)&irq_watcher_5, 0x45, 0);
modify_gate_address((u_long)&irq_watcher_6, 0x46, 0);
modify_gate_address((u_long)&irq_watcher_7, 0x47, 0);
modify_gate_address((u_long)&irq_watcher_8, 0x48, 0);
modify_gate_address((u_long)&irq_watcher_9, 0x49, 0);
modify_gate_address((u_long)&irq_watcher_10, 0x4A, 0);
modify_gate_address((u_long)&irq_watcher_11, 0x4B, 0);
modify_gate_address((u_long)&irq_watcher_12, 0x4C, 0);
modify_gate_address((u_long)&irq_watcher_13, 0x4D, 0);
modify_gate_address((u_long)&irq_watcher_14, 0x4E, 0);
modify_gate_address((u_long)&irq_watcher_15, 0x4F, 0);
k_printf("completed\n");
k_printf("The IRQs have been setup.\n");
};
void install_idt()
{
idtp.limit=(sizeof(struct idt_entry)* 47)-1; /* 255 ISRs */
idtp.base=(unsigned int)&idt;
remap_pics(0x20,0x28); /* remap interrups to;
master pic interrups -> 0x20 (32)
slave pic interrupts -> 0x28 (40)
*/
/* assing handlers to interrups & exceptions */
set_idt_entry(0 ,(unsigned long)&isr0,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(1 ,(unsigned long)&isr1,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(2 ,(unsigned long)&isr2,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(3 ,(unsigned long)&isr3,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(4 ,(unsigned long)&isr4,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(5 ,(unsigned long)&isr5,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(6 ,(unsigned long)&isr6,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(7 ,(unsigned long)&isr7,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(8 ,(unsigned long)&isr8,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(9 ,(unsigned long)&isr9,0x08 , 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(10,(unsigned long)&isr10,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(11,(unsigned long)&isr11,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(12,(unsigned long)&isr12,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(13,(unsigned long)&isr13,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(14,(unsigned long)&isr14,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(15,(unsigned long)&isr15,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(16,(unsigned long)&isr16,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(17,(unsigned long)&isr17,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(18,(unsigned long)&isr18,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(19,(unsigned long)&isr19,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(20,(unsigned long)&isr20,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(21,(unsigned long)&isr21,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(22,(unsigned long)&isr22,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(23,(unsigned long)&isr23,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(24,(unsigned long)&isr24,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(25,(unsigned long)&isr25,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(26,(unsigned long)&isr26,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(27,(unsigned long)&isr27,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(28,(unsigned long)&isr28,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(29,(unsigned long)&isr29,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(30,(unsigned long)&isr30,0x08, 0xF | PRESENT | KERNEL_LEVEL);
set_idt_entry(31,(unsigned long)&isr31,0x08, 0xF | PRESENT | KERNEL_LEVEL);
/* hardware IRQ handlers */
set_idt_entry(32,(unsigned long)&IRQ0,0x08, 0xF | PRESENT | KERNEL_LEVEL); // timer IRQ
set_idt_entry(33,(unsigned long)&IRQ1,0x08, 0xF | PRESENT | KERNEL_LEVEL); // keyboard IRQ
set_idt_entry(34,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(35,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(36,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(37,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(38,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(39,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(40,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(41,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(42,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(43,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(44,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(45,(unsigned long)&IRQ_NOT_IMPLEMENTED,0x08, 0xF | NOT_PRESENT | KERNEL_LEVEL);
set_idt_entry(46,(unsigned long)&IRQ14,0x08, 0xF | PRESENT | KERNEL_LEVEL); // ata-0 handler
set_idt_entry(47,(unsigned long)&IRQ15,0x08, 0xF | PRESENT | KERNEL_LEVEL); // ata-1 handler
load_idt();
}
