X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2Fintr.h;fp=src%2Fintr.h;h=04c775ce906faea4286e62a0bdce5020506c553c;hb=a2f94f569a4c99204de02814a20098a71527e913;hp=0000000000000000000000000000000000000000;hpb=d1e8a437c1fab4535f82c4c214ec3330ac32e48d;p=bootcensus

diff --git a/src/intr.h b/src/intr.h
new file mode 100644
index 0000000..04c775c
--- /dev/null
+++ b/src/intr.h
@@ -0,0 +1,66 @@
+#ifndef INTR_H_
+#define INTR_H_
+
+#include <inttypes.h>
+#include "asmops.h"
+
+/* offset used to remap IRQ numbers (+32) */
+#define IRQ_OFFSET		32
+/* conversion macros between IRQ and interrupt numbers */
+#define IRQ_TO_INTR(x)	((x) + IRQ_OFFSET)
+#define INTR_TO_IRQ(x)	((x) - IRQ_OFFSET)
+/* checks whether a particular interrupt is an remapped IRQ */
+#define IS_IRQ(n)	((n) >= IRQ_OFFSET && (n) < IRQ_OFFSET + 16)
+
+/* general purpose registers as they are pushed by pusha */
+struct registers {
+	uint32_t edi, esi, ebp, esp;
+	uint32_t ebx, edx, ecx, eax;
+} __attribute__ ((packed));
+
+/* structure used to pass the interrupt stack frame from the
+ * entry points to the C dispatch function.
+ */
+struct intr_frame {
+	/* registers pushed by pusha in intr_entry_* */
+	struct registers regs;
+	/* data segment selectors */
+	/* XXX removed: not needed unless we do dpl3 transitions
+	uint32_t ds, es, fs, gs;
+	*/
+	/* interrupt number and error code pushed in intr_entry_* */
+	uint32_t inum, err;
+	/* pushed by CPU during interrupt entry */
+	uint32_t eip, cs, eflags;
+	/* pushed by CPU during interrupt entry from user space */
+	/* XXX removed: again, not doing user space currently
+	uint32_t esp, ss;
+	*/
+} __attribute__ ((packed));
+
+
+
+typedef void (*intr_func_t)(int);
+
+
+void init_intr(void);
+
+struct intr_frame *get_intr_frame(void);
+
+/* install high level interrupt callback */
+void interrupt(int intr_num, intr_func_t func);
+
+/* install low-level interrupt vector in IDT
+ * must be able to handle EOI and return with iret
+ */
+void set_intr_entry(int num, void (*handler)(void));
+
+/* defined in intr_asm.S */
+int get_intr_flag(void);
+void set_intr_flag(int onoff);
+
+void intr_ret(struct intr_frame ifrm);
+
+void end_of_irq(int irq);
+
+#endif	/* INTR_H_ */