2 * GeekOS interrupt handling data structures and functions
3 * Copyright (c) 2001,2003 David H. Hovemeyer <daveho@cs.umd.edu>
6 * This is free software. You are permitted to use,
7 * redistribute, and modify it as specified in the file "COPYING".
10 #include <geekos/idt.h> /* x86-specific int handling stuff */
11 #include <geekos/screen.h>
12 #include <geekos/kassert.h>
13 #include <geekos/int.h>
14 #include <geekos/serial.h>
15 #include <geekos/vmcs.h>
17 #include <geekos/cpu.h>
20 * Defined in lowlevel.asm.
22 ulong_t Get_Current_EFLAGS(void);
24 /* ----------------------------------------------------------------------
25 * Private functions and data
26 * ---------------------------------------------------------------------- */
29 * A dummy interrupt handler function.
30 * Ensures that the low-level interrupt code always
31 * has a handler to call.
33 static void Dummy_Interrupt_Handler(struct Interrupt_State* state)
37 Print("Unexpected Interrupt! Ignoring!\n");
38 SerialPrint("*** Unexpected interrupt! *** Ignoring!\n");
39 Dump_Interrupt_State(state);
40 SerialPrint_VMCS_ALL();
48 static void Print_Selector(const char* regName, uint_t value)
50 Print("%s: index=%d, ti=%d, rpl=%d\n",
51 regName, value >> 3, (value >> 2) & 1, value & 3);
55 static void SerialPrint_Selector(const char* regName, uint_t value)
57 SerialPrint("%s: index=%d, ti=%d, rpl=%d\n",
58 regName, value >> 3, (value >> 2) & 1, value & 3);
61 /* ----------------------------------------------------------------------
63 * ---------------------------------------------------------------------- */
66 * Initialize the interrupt system.
68 void Init_Interrupts(void)
72 PrintBoth("Initializing Interrupts\n");
74 /* Low-level initialization. Build and initialize the IDT. */
78 * Initialize all entries of the handler table with a dummy handler.
79 * This will ensure that we always have a handler function to call.
81 for (i = 0; i < NUM_IDT_ENTRIES; ++i) {
82 Install_Interrupt_Handler(i, Dummy_Interrupt_Handler);
85 /* Re-enable interrupts */
90 * Query whether or not interrupts are currently enabled.
92 bool Interrupts_Enabled(void)
94 ulong_t eflags = Get_Current_EFLAGS();
95 return (eflags & EFLAGS_IF) != 0;
99 * Dump interrupt state struct to screen
101 void Dump_Interrupt_State(struct Interrupt_State* state)
103 uint_t errorCode = state->errorCode;
105 SerialPrint("eax=%08x ebx=%08x ecx=%08x edx=%08x\n"
106 "esi=%08x edi=%08x ebp=%08x\n"
107 "eip=%08x cs=%08x eflags=%08x\n"
108 "Interrupt number=%d (%s), error code=%d\n"
109 "index=%d, TI=%d, IDT=%d, EXT=%d\n",
110 state->eax, state->ebx, state->ecx, state->edx,
111 state->esi, state->edi, state->ebp,
112 state->eip, state->cs, state->eflags,
113 state->intNum, exception_names[state->intNum], errorCode,
114 errorCode >> 3, (errorCode >> 2) & 1, (errorCode >> 1) & 1, errorCode & 1
116 if (Is_User_Interrupt(state)) {
117 struct User_Interrupt_State *ustate = (struct User_Interrupt_State*) state;
118 SerialPrint("user esp=%08x, user ss=%08x\n", ustate->espUser, ustate->ssUser);
120 SerialPrint_Selector("cs", state->cs);
121 SerialPrint_Selector("ds", state->ds);
122 SerialPrint_Selector("es", state->es);
123 SerialPrint_Selector("fs", state->fs);
124 SerialPrint_Selector("gs", state->gs);