interrupts, timer, keyboard, segments, lots of kernel code

[bootcensus] / src / intr.h

diff --git a/src/intr.h b/src/intr.h
new file mode 100644 (file)
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_ */