Initial commit

2021-01-28 22:59:39 +01:00
commit d7f0e8dd36
30 changed files with 2092 additions and 0 deletions
--- a/kernel/cpu/isr.c
+++ b/kernel/cpu/isr.c
@@ -0,0 +1,144 @@
+//
+// Created by rick on 8/18/19.
+//
+
+#include "isr.h"
+#include <kprint.h>
+
+#include <cpu/idt.h>
+#include <libc/libc.h>
+#include <drivers/ports.h>
+
+isr_t interrupt_handlers[256];
+
+void isr_install() {
+    set_idt_gate(0, (u32) isr0);
+    set_idt_gate(1, (u32) isr1);
+    set_idt_gate(2, (u32) isr2);
+    set_idt_gate(3, (u32) isr3);
+    set_idt_gate(4, (u32) isr4);
+    set_idt_gate(5, (u32) isr5);
+    set_idt_gate(6, (u32) isr6);
+    set_idt_gate(7, (u32) isr7);
+    set_idt_gate(8, (u32) isr8);
+    set_idt_gate(9, (u32) isr9);
+    set_idt_gate(10, (u32) isr10);
+    set_idt_gate(11, (u32) isr11);
+    set_idt_gate(12, (u32) isr12);
+    set_idt_gate(13, (u32) isr13);
+    set_idt_gate(14, (u32) isr14);
+    set_idt_gate(15, (u32) isr15);
+    set_idt_gate(16, (u32) isr16);
+    set_idt_gate(17, (u32) isr17);
+    set_idt_gate(18, (u32) isr18);
+    set_idt_gate(19, (u32) isr19);
+    set_idt_gate(20, (u32) isr20);
+    set_idt_gate(21, (u32) isr21);
+    set_idt_gate(22, (u32) isr22);
+    set_idt_gate(23, (u32) isr23);
+    set_idt_gate(24, (u32) isr24);
+    set_idt_gate(25, (u32) isr25);
+    set_idt_gate(26, (u32) isr26);
+    set_idt_gate(27, (u32) isr27);
+    set_idt_gate(28, (u32) isr28);
+    set_idt_gate(29, (u32) isr29);
+    set_idt_gate(30, (u32) isr30);
+    set_idt_gate(31, (u32) isr31);
+
+    // Remap the PIC
+    port_byte_out(0x20, 0x11);
+    port_byte_out(0xA0, 0x11);
+    port_byte_out(0x21, 0x20);
+    port_byte_out(0xA1, 0x28);
+    port_byte_out(0x21, 0x04);
+    port_byte_out(0xA1, 0x02);
+    port_byte_out(0x21, 0x01);
+    port_byte_out(0xA1, 0x01);
+    port_byte_out(0x21, 0x0);
+    port_byte_out(0xA1, 0x0);
+
+    // Install the IRQs
+    set_idt_gate(32, (u32) irq0);
+    set_idt_gate(33, (u32) irq1);
+    set_idt_gate(34, (u32) irq2);
+    set_idt_gate(35, (u32) irq3);
+    set_idt_gate(36, (u32) irq4);
+    set_idt_gate(37, (u32) irq5);
+    set_idt_gate(38, (u32) irq6);
+    set_idt_gate(39, (u32) irq7);
+    set_idt_gate(40, (u32) irq8);
+    set_idt_gate(41, (u32) irq9);
+    set_idt_gate(42, (u32) irq10);
+    set_idt_gate(43, (u32) irq11);
+    set_idt_gate(44, (u32) irq12);
+    set_idt_gate(45, (u32) irq13);
+    set_idt_gate(46, (u32) irq14);
+    set_idt_gate(47, (u32) irq15);
+
+    set_idt(); // Load with ASM
+}
+
+char *exception_messages[] = {
+        "Division By Zero",
+        "Debug",
+        "Non Maskable Interrupt",
+        "Breakpoint",
+        "Into Detected Overflow",
+        "Out of Bounds",
+        "Invalid Opcode",
+        "No Coprocessor",
+
+        "Double Fault",
+        "Coprocessor Segment Overrun",
+        "Bad TSS",
+        "Segment Not Present",
+        "Stack Fault",
+        "General Protection Fault",
+        "Page Fault",
+        "Unknown Interrupt",
+
+        "Coprocessor Fault",
+        "Alignment Check",
+        "Machine Check",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved",
+        "Reserved"
+};
+
+void isr_handler(registers_t r) {
+    kprint("received interrupt: ");
+    char s[3];
+    itoa(r.int_no, s);
+    kprint(s);
+    kprint("\n");
+    kprint(exception_messages[r.int_no]);
+    kprint("\n");
+}
+
+void register_interrupt_handler(u8 n, isr_t handler) {
+    interrupt_handlers[n] = handler;
+}
+
+void irq_handler(registers_t r) {
+    /* After every interrupt we need to send an EOI to the PICs
+     * or they will not send another interrupt again */
+    if (r.int_no >= 40) port_byte_out(0xA0, 0x20); /* slave */
+    port_byte_out(0x20, 0x20); /* master */
+
+    /* Handle the interrupt in a more modular way */
+    if (interrupt_handlers[r.int_no] != 0) {
+        isr_t handler = interrupt_handlers[r.int_no];
+        handler(r);
+    }
+}