--- /dev/null
+/*
+ * GeekOS interrupt handling data structures and functions
+ * Copyright (c) 2001, David H. Hovemeyer <daveho@cs.umd.edu>
+ * $Revision: 1.1 $
+ *
+ * This is free software. You are permitted to use,
+ * redistribute, and modify it as specified in the file "COPYING".
+ */
+
+/*
+ * This module describes the C interface which must be implemented
+ * by interrupt handlers, and has the initialization function
+ * for the interrupt system as a whole.
+ */
+
+#ifndef GEEKOS_INT_H
+#define GEEKOS_INT_H
+
+#include <geekos/kassert.h>
+#include <geekos/ktypes.h>
+#include <geekos/defs.h>
+
+
+// to stop the compilation warnings
+extern void Print(const char* fmt, ...);
+extern void Set_Current_Attr(uchar_t attrib);
+
+/*
+ * This struct reflects the contents of the stack when
+ * a C interrupt handler function is called.
+ * It must be kept up to date with the code in "lowlevel.asm".
+ */
+struct Interrupt_State {
+ /*
+ * The register contents at the time of the exception.
+ * We save these explicitly.
+ */
+ uint_t gs;
+ uint_t fs;
+ uint_t es;
+ uint_t ds;
+ uint_t ebp;
+ uint_t edi;
+ uint_t esi;
+ uint_t edx;
+ uint_t ecx;
+ uint_t ebx;
+ uint_t eax;
+
+ /*
+ * We explicitly push the interrupt number.
+ * This makes it easy for the handler function to determine
+ * which interrupt occurred.
+ */
+ uint_t intNum;
+
+ /*
+ * This may be pushed by the processor; if not, we push
+ * a dummy error code, so the stack layout is the same
+ * for every type of interrupt.
+ */
+ uint_t errorCode;
+
+ /* These are always pushed on the stack by the processor. */
+ uint_t eip;
+ uint_t cs;
+ uint_t eflags;
+};
+
+/*
+ * An interrupt that occurred in user mode.
+ * If Is_User_Interrupt(state) returns true, then the
+ * Interrupt_State object may be cast to this kind of struct.
+ */
+struct User_Interrupt_State {
+ struct Interrupt_State state;
+ uint_t espUser;
+ uint_t ssUser;
+};
+
+static __inline__ bool Is_User_Interrupt(struct Interrupt_State *state)
+{
+ return (state->cs & 3) == USER_PRIVILEGE;
+}
+
+
+/*
+ * The signature of an interrupt handler.
+ */
+typedef void (*Interrupt_Handler)(struct Interrupt_State* state);
+
+/*
+ * Perform all low- and high-level initialization of the
+ * interrupt system.
+ */
+void Init_Interrupts(void);
+
+/*
+ * Query whether or not interrupts are currently enabled.
+ */
+bool Interrupts_Enabled(void);
+
+/*
+ * Block interrupts.
+ */
+static __inline__ void __Disable_Interrupts(void)
+{
+ __asm__ __volatile__ ("cli");
+}
+#define Disable_Interrupts() \
+do { \
+ KASSERT(Interrupts_Enabled()); \
+ __Disable_Interrupts(); \
+} while (0)
+
+/*
+ * Unblock interrupts.
+ */
+static __inline__ void __Enable_Interrupts(void)
+{
+ __asm__ __volatile__ ("sti");
+}
+#define Enable_Interrupts() \
+do { \
+ KASSERT(!Interrupts_Enabled()); \
+ __Enable_Interrupts(); \
+} while (0)
+
+/*
+ * Dump interrupt state struct to screen
+ */
+void Dump_Interrupt_State(struct Interrupt_State* state);
+
+/**
+ * Start interrupt-atomic region.
+ * @return true if interrupts were enabled at beginning of call,
+ * false otherwise.
+ */
+static __inline__ bool Begin_Int_Atomic(void)
+{
+ bool enabled = Interrupts_Enabled();
+ if (enabled)
+ Disable_Interrupts();
+ return enabled;
+}
+
+/**
+ * End interrupt-atomic region.
+ * @param iflag the value returned from the original Begin_Int_Atomic() call.
+ */
+static __inline__ void End_Int_Atomic(bool iflag)
+{
+ KASSERT(!Interrupts_Enabled());
+ if (iflag) {
+ /* Interrupts were originally enabled, so turn them back on */
+ Enable_Interrupts();
+ }
+}
+
+#define EXCEPTION_DE 0 // Divide by zero
+#define EXCEPTION_DB 1 // reserved
+#define EXCEPTION_NMI 2 // NMI
+#define EXCEPTION_BP 3 // Breakpoint
+#define EXCEPTION_OF 4 // Overflow
+#define EXCEPTION_BR 5 // Bound range exceeded
+#define EXCEPTION_UD 6 // Undefined opcode
+#define EXCEPTION_NM 7 // Math coprocessor gone missing
+#define EXCEPTION_DF 8 // Double fault
+#define EXCEPTION_CO 9 // Coprocessor segment overrrun
+#define EXCEPTION_TS 10 // Invalid TSS
+#define EXCEPTION_NP 11 // Segment not present
+#define EXCEPTION_SS 12 // Stack segment fault
+#define EXCEPTION_GP 13 // General Protection fault
+#define EXCEPTION_PF 14 // Page Fault
+#define EXCEPTION_RES 15 // reserved
+#define EXCEPTION_MF 16 // Math fault
+#define EXCEPTION_AC 17 // Alignment check
+#define EXCEPTION_MC 18 // Machine check
+#define EXCEPTION_XF 19 // SIMD FP exception
+// 20+ are reserved
+
+
+
+
+#endif /* GEEKOS_INT_H */
