Big code refactor, get rid of HAL entirely

kernel/intr/intr.h

@@ -0,0 +1,42 @@
+#ifndef INTR_INTR_H_
+#define INTR_INTR_H_
+
+#include <stdint.h>
+#include "compiler/attr.h"
+
+#define INTR_IRQBASE 0x20
+
+typedef struct {
+  uint64_t r15;
+  uint64_t r14;
+  uint64_t r13;
+  uint64_t r12;
+  uint64_t r11;
+  uint64_t r10;
+  uint64_t r9;
+  uint64_t r8;
+  uint64_t rbp;
+  uint64_t rdi;
+  uint64_t rsi;
+  uint64_t rdx;
+  uint64_t rcx;
+  uint64_t rax;
+} PACKED SavedRegs;
+
+typedef struct {
+  SavedRegs regs;
+  uint64_t trapnum;
+  uint64_t errnum;
+  uint64_t rip;
+  uint64_t cs;
+  uint64_t rflags;
+  uint64_t rsp;
+  uint64_t ss;
+} PACKED IntrStackFrame;
+
+void intr_attchhandler(void (*fn)(void), int irq);
+void intr_disable(void);
+void intr_enable(void);
+void intr_init(void);
+
+#endif // INTR_INTR_H_