initial razzle

arch/i386/asm.c

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <stdint.h>
+
+struct regs {
+  unsigned int gs, fs, es, ds;
+  unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax;
+  unsigned int int_no, err_code;
+  unsigned int eip, cs, eflags, useresp, ss;
+};
+
+void __sl_acquire(uint32_t *lock_id) {
+  __asm__("retry_lock: lock bts $0,(%0); pause; jc retry_lock" : "+g"(lock_id));
+}
+
+void __sl_release(uint32_t *lock_id) {
+  __asm__("lock btr $0, (%0)" : "+g"(lock_id));
+}
+
+static inline void outb(int port, int val) {
+  __asm__ volatile("outb %b0, %w1" : : "a"(val), "Nd"(port) : "memory");
+}
+
+static inline unsigned char inb(int port) {
+  unsigned char val;
+  __asm__ volatile("inb %w1, %b0" : "=a"(val) : "Nd"(port) : "memory");
+  return val;
+}
+
+static inline void interrupt_disable() { __asm__ volatile("cli"); }
+
+static inline void interrupt_enable() { __asm__ volatile("sti"); }