X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dos_sbtest;a=blobdiff_plain;f=src%2Fintr.h;fp=src%2Fintr.h;h=3345324d476e8de2942a381615d30067af9fd671;hp=0000000000000000000000000000000000000000;hb=07c19444f4f2a55abf97d181ab62aeaa51033c62;hpb=01a545fde6dc446fe626382f8bba50b9b7c1a35b

diff --git a/src/intr.h b/src/intr.h
new file mode 100644
index 0000000..3345324
--- /dev/null
+++ b/src/intr.h
@@ -0,0 +1,60 @@
+#ifndef INTR_H_
+#define INTR_H_
+
+#define INTERRUPT	__interrupt __far
+
+#define IRQ_TO_INTR(x)	((x) + 8)
+
+/* PIC command and data ports */
+#define PIC1_CMD	0x20
+#define PIC1_DATA	0x21
+#define PIC2_CMD	0xa0
+#define PIC2_DATA	0xa1
+/* PIC operation command word 2 bits */
+#define OCW2_EOI	(1 << 5)
+
+unsigned char get_irq_mask(int pic);
+#pragma aux get_irq_mask = \
+		"cmp bx, 0" \
+		"jnz getpic2" \
+		"in al, 0x21" \
+		"jmp getend" \
+		"getpic2:" \
+		"in al, 0xa1" \
+		"getend:" \
+		value[al] parm[ebx];
+
+void mask_irq(int irq);
+#pragma aux mask_irq = \
+		"mov dx, 0x21" \
+		"cmp ax, 8" \
+		"jb skip_mask_pic2" \
+		"mov dx, 0xa1" \
+		"sub ax, 8" \
+		"skip_mask_pic2:" \
+		"mov cl, al" \
+		"mov ah, 1" \
+		"shl ah, cl" \
+		"in al, dx" \
+		"or al, ah" \
+		"out dx, al" \
+		parm[eax] modify[cl dx];
+
+void unmask_irq(int irq);
+#pragma aux unmask_irq = \
+		"mov dx, 0x21" \
+		"cmp ax, 8" \
+		"jb skip_unmask_pic2" \
+		"mov dx, 0xa1" \
+		"sub ax, 8" \
+		"skip_unmask_pic2:" \
+		"mov cl, al" \
+		"mov ah, 1" \
+		"shl ah, cl" \
+		"not ah" \
+		"in al, dx" \
+		"and al, ah" \
+		"out dx, al" \
+		parm[eax] modify[cl dx];
+
+#endif	/* INTR_H_ */