foo

[eightysix] / kern / src / intr.h

diff --git a/kern/src/intr.h b/kern/src/intr.h
new file mode 100644 (file)
index 0000000..569dbd7
--- /dev/null
+++ b/kern/src/intr.h
@@ -0,0 +1,48 @@
+#ifndef INTR_H_
+#define INTR_H_
+
+#include <inttypes.h>
+#include "asmutil.h"
+
+#define IRQ_TO_INUM(x) ((x) + 8)
+#define INUM_TO_IRQ(x) ((x) - 8)
+
+/* general purpose registers, pushed by interrupt entry routine */
+struct registers {
+       uint16_t di, si, bp, sp;
+       uint16_t bx, dx, cx, ax;
+} __attribute__((packed));
+
+struct intr_frame {
+       /* registers pushed by intr_entry_* */
+       struct registers regs;
+       /* interrupt number */
+       uint16_t inum;
+       /* pushed by CPU during interrupt entry */
+       uint16_t ip, cs, flags;
+} __attribute__((packed));
+
+typedef void (*intr_func_t)(struct intr_frame *frm);
+
+void init_intr(void);
+void dispatch_intr(struct intr_frame frm);
+
+/* set low level interrupt vector */
+void set_intr_vect(int n, uint16_t seg, uint16_t offs);
+/* set interrupt callback */
+void set_intr(int n, intr_func_t func);
+
+void mask_irq(int n);
+void unmask_irq(int n);
+
+#define end_of_irq(n) \
+       asm volatile( \
+               "\n\ttest $8, %0" \
+               "\n\tjz 0f" \
+               "\n\tmov $0x20, %%ax" \
+               "\n\tout %%ax, $0xa0" \
+               "\n0:\tmov $0x20, %%ax" \
+               "\n\tout %%ax, $0x20" \
+               :: "a"(n))
+
+#endif /* INTR_H_ */