X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=kern%2Fsrc%2Fasmutil.h;fp=kern%2Fsrc%2Fasmutil.h;h=751def6f7411c698c1ca96cc53b4e4dae298f664;hb=88e57cf7f2581900eb31cb835a18ad414e37786c;hp=0000000000000000000000000000000000000000;hpb=5145ed1e2adefc9c66e20681532a3a7cd6c2de01;p=eightysix

diff --git a/kern/src/asmutil.h b/kern/src/asmutil.h
new file mode 100644
index 0000000..751def6
--- /dev/null
+++ b/kern/src/asmutil.h
@@ -0,0 +1,61 @@
+#ifndef ASMUTIL_H_
+#define ASMUTIL_H_
+
+#include <inttypes.h>
+
+struct wordregs {
+	uint16_t ax, bx, cx, dx;
+	uint16_t si, di, cflag;
+} __attribute__((packed));
+
+struct byteregs {
+	uint8_t al, ah;
+	uint8_t bl, bh;
+	uint8_t cl, ch;
+	uint8_t dl, dh;
+} __attribute__((packed));
+
+union regs {
+	struct wordregs w;
+	struct byteregs h;
+};
+
+void int86(int n, union regs *inregs, union regs *outregs);
+
+#define FP_SEG(x)	((uint16_t)((uint32_t)(x) >> 16))
+#define FP_OFFS(x)	((uint16_t)(x))
+#define MK_FP(s, o)	(((uint32_t)(s) << 16) | (uint32_t)(o))
+
+#define enable() asm("sti")
+#define disable() asm("cli")
+
+#define outp(p, v)	\
+	asm volatile( \
+		"outb %1, %0" \
+		:: "d"(p), "a"((unsigned char)v))
+
+#define outpw(p, v)	\
+	asm volatile( \
+		"outw %1, %0" \
+		:: "d"(p), "a"((unsigned short)v))
+
+static inline unsigned char inp(int p)
+{
+	unsigned char res;
+	asm volatile(
+		"inb %1, %0" \
+		: "=a"(res) : "d"(p));
+	return res;
+}
+
+static inline unsigned short inpw(int p)
+{
+	unsigned short res;
+	asm volatile(
+		"inw %1, %0" \
+		: "=a"(res) : "d"(p));
+	return res;
+}
+
+
+#endif	/* ASMUTIL_H_ */