[INTERRUPTS] Exception handling

kernel/include/debug.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <string.h>
+#include <int.h>
 
 #ifndef NDEBUG
   #define debug(...) debug_printf(__VA_ARGS__)
@@ -29,3 +30,4 @@ char *_kernel_git_branch;
 void debug_build_time();
 void debug_git_info();
 
+void print_registers(registers_t *);

kernel/include/int.h

@@ -0,0 +1,90 @@
+#pragma once
+
+#define   IDT_CALL        0x0C
+#define   IDT_INTERRUPT   0x0E
+#define   IDT_TRAP        0x0F
+#define   IDT_DPL0        0x00
+#define   IDT_DPL3        0x60
+#define   IDT_PRESENT     0x80
+
+#define   NUM_INTERRUPTS   256
+
+#define   INT_DE    0x00 // Divide by zero exception
+#define   INT_DB    0x01 // Debug exception
+#define   INT_NMI   0x02 // Non-maskable Interrupt exception
+#define   INT_BP    0x03 // Beakpoint exception
+#define   INT_OF    0x04 // Overflow exception
+#define   INT_BR    0x05 // Bound Range exception
+#define   INT_UD    0x06 // Invalid Opcode exception
+#define   INT_NM    0x07 // Device not Available exception
+#define   INT_DF    0x08 // Double Fault exception
+#define   INT_CSO   0x09 // Coprocessor Segment Overrun exception
+#define   INT_TS    0x0A // Invalid TSS exception
+#define   INT_NP    0x0B // Segment not Present excepton
+#define   INT_SS    0x0C // Stack exception
+#define   INT_GP    0x0D // General Protection Fault exception
+#define   INT_PF    0x0E // Page Fault exception
+// Unused exception 0x0F
+#define   INT_MF    0x10 // Floating Point exception pending
+#define   INT_AC    0x11 // Alignment Check exception
+#define   INT_MC    0x12 // Machine Check exception
+#define   INT_XF    0x13 // SIMD Floating Point exception
+// Unused exception 0x14 - 0x1D
+#define   INT_SX    0x1E // Security exception
+// Unused exception 0x1F
+// User interrupts  0x20 and forward
+
+#ifndef __ASSEMBLER__
+#include <stdint.h>
+
+struct int_gate_descriptor
+{
+  uint16_t base_l;
+  uint16_t cs;
+  uint8_t ist;
+  uint8_t flags;
+  uint16_t base_m;
+  uint32_t base_h;
+  uint32_t ignored;
+} __attribute__ ((packed));
+
+struct idtr
+{
+  uint16_t len;
+  uint64_t addr;
+} __attribute__ ((packed));
+
+typedef struct registers_st
+{
+  uint64_t rax;
+  uint64_t rbx;
+  uint64_t rcx;
+  uint64_t rdx;
+  uint64_t rsi;
+  uint64_t rdi;
+  uint64_t rbp;
+  uint64_t r8;
+  uint64_t r9;
+  uint64_t r10;
+  uint64_t r11;
+  uint64_t r12;
+  uint64_t r13;
+  uint64_t r14;
+  uint64_t r15;
+
+  uint64_t int_no;
+  uint64_t err_code;
+  uint64_t rip;
+  uint64_t cs;
+  uint64_t rflags;
+  uint64_t rsp;
+  uint64_t ss;
+}registers_t;
+
+typedef registers_t *(*int_handler_t)(registers_t *);
+
+void interrupt_init();
+int_handler_t register_int_handler(uint32_t num, int_handler_t h);
+void isr_return(registers_t *r);
+
+#endif

kernel/include/registers.h

@@ -0,0 +1,7 @@
+#pragma once
+
+void load_idt(void *);
+uint64_t read_cr0();
+uint64_t read_cr2();
+uint64_t read_cr3();
+uint64_t read_cr4();