X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=3sys;a=blobdiff_plain;f=sys1%2Fkern%2Fsrc%2Fasmutil.h;fp=sys1%2Fkern%2Fsrc%2Fasmutil.h;h=fb852a17c416d605ba2aa357dbee2efd46533e62;hp=0000000000000000000000000000000000000000;hb=d49aa763f9b7c4ae66cf80f0cbfc3456789fc0ac;hpb=3e2e8a9156d288d230bbcd722bc91c4b3e4b21e1

diff --git a/sys1/kern/src/asmutil.h b/sys1/kern/src/asmutil.h
new file mode 100644
index 0000000..fb852a1
--- /dev/null
+++ b/sys1/kern/src/asmutil.h
@@ -0,0 +1,44 @@
+#ifndef ASMUTIL_H_
+#define ASMUTIL_H_
+
+#include <stdint.h>
+
+/* inline assembly utility macros */
+
+#define enable_intr() asm volatile("sti")
+#define disable_intr() asm volatile("cli")
+
+#define set_intr_state(en) \
+	do { if(en) enable_intr(); else disable_intr(); } while(0)
+
+static inline int get_intr_state(void)
+{
+	int res;
+	asm volatile (
+		"\r\tpushf"
+		"\r\tpop %0"
+		: "=r"(res));
+	return (res >> 9) & 1;	/* IF is bit 9 of eflags */
+}
+
+#define outp(port, val) \
+	asm volatile("out %%al, %%dx" :: "d"(port), "a"((unsigned char)val))
+#define outp16(port, val) \
+	asm volatile("out %%ax, %%dx" :: "d"(port), "a"((unsigned short)val))
+
+static inline uint8_t inp(int port)
+{
+	uint8_t res;
+	asm volatile("in %%dx, %%al" : "=a"(res) : "d"(port));
+	return res;
+}
+
+static inline uint16_t inp16(int port)
+{
+	uint16_t res;
+	asm volatile("in %%dx, %%ax" : "=a"(res) : "d"(port));
+	return res;
+}
+
+
+#endif	/* ASMUTIL_H_ */