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- | 1 | /* |
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- | 2 | * Copyright (C) 2003-2004 Jakub Jermar |
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- | 3 | * All rights reserved. |
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- | 4 | * |
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- | 5 | * Redistribution and use in source and binary forms, with or without |
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- | 6 | * modification, are permitted provided that the following conditions |
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- | 7 | * are met: |
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- | 8 | * |
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- | 9 | * - Redistributions of source code must retain the above copyright |
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- | 10 | * notice, this list of conditions and the following disclaimer. |
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- | 11 | * - Redistributions in binary form must reproduce the above copyright |
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- | 12 | * notice, this list of conditions and the following disclaimer in the |
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- | 13 | * documentation and/or other materials provided with the distribution. |
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- | 14 | * - The name of the author may not be used to endorse or promote products |
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- | 15 | * derived from this software without specific prior written permission. |
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- | 16 | * |
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- | 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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- | 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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- | 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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- | 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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- | 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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- | 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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- | 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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- | 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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- | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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- | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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- | 27 | */ |
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- | 28 | ||
- | 29 | #include <arch/interrupt.h> |
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- | 30 | #include <arch/types.h> |
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- | 31 | #include <arch.h> |
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- | 32 | #include <arch/cp0.h> |
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- | 33 | #include <time/clock.h> |
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- | 34 | #include <panic.h> |
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- | 35 | #include <print.h> |
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- | 36 | #include <symtab.h> |
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- | 37 | #include <arch/drivers/arc.h> |
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- | 38 | #include <arch/drivers/keyboard.h> |
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- | 39 | ||
- | 40 | static void print_regdump(struct exception_regdump *pstate) |
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- | 41 | { |
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- | 42 | char *pcsymbol = ""; |
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- | 43 | char *rasymbol = ""; |
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- | 44 | ||
- | 45 | char *s = get_symtab_entry(pstate->epc); |
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- | 46 | if (s) |
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- | 47 | pcsymbol = s; |
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- | 48 | s = get_symtab_entry(pstate->ra); |
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- | 49 | if (s) |
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- | 50 | rasymbol = s; |
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- | 51 | ||
- | 52 | printf("PC: %X(%s) RA: %X(%s)\n",pstate->epc,pcsymbol, |
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- | 53 | pstate->ra,rasymbol); |
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- | 54 | } |
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- | 55 | ||
- | 56 | /** Disable interrupts. |
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- | 57 | * |
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- | 58 | * @return Old interrupt priority level. |
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- | 59 | */ |
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- | 60 | ipl_t interrupts_disable(void) |
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- | 61 | { |
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- | 62 | ipl_t ipl = (ipl_t) cp0_status_read(); |
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- | 63 | cp0_status_write(ipl & ~cp0_status_ie_enabled_bit); |
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- | 64 | return ipl; |
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- | 65 | } |
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- | 66 | ||
- | 67 | /** Enable interrupts. |
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- | 68 | * |
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- | 69 | * @return Old interrupt priority level. |
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- | 70 | */ |
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- | 71 | ipl_t interrupts_enable(void) |
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- | 72 | { |
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- | 73 | ipl_t ipl = (ipl_t) cp0_status_read(); |
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- | 74 | cp0_status_write(ipl | cp0_status_ie_enabled_bit); |
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- | 75 | return ipl; |
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- | 76 | } |
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- | 77 | ||
- | 78 | /** Restore interrupt priority level. |
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- | 79 | * |
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- | 80 | * @param ipl Saved interrupt priority level. |
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- | 81 | */ |
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- | 82 | void interrupts_restore(ipl_t ipl) |
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- | 83 | { |
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- | 84 | cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit)); |
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- | 85 | } |
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- | 86 | ||
- | 87 | /** Read interrupt priority level. |
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- | 88 | * |
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- | 89 | * @return Current interrupt priority level. |
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- | 90 | */ |
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- | 91 | ipl_t interrupts_read(void) |
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- | 92 | { |
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- | 93 | return cp0_status_read(); |
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- | 94 | } |
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- | 95 | ||
- | 96 | void interrupt(struct exception_regdump *pstate) |
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- | 97 | { |
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- | 98 | __u32 cause; |
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- | 99 | int i; |
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- | 100 | ||
- | 101 | /* decode interrupt number and process the interrupt */ |
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- | 102 | cause = (cp0_cause_read() >> 8) &0xff; |
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- | 103 | ||
- | 104 | for (i = 0; i < 8; i++) { |
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- | 105 | if (cause & (1 << i)) { |
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- | 106 | switch (i) { |
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- | 107 | case 0: /* SW0 - Software interrupt 0 */ |
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- | 108 | cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */ |
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- | 109 | break; |
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- | 110 | case 1: /* SW1 - Software interrupt 1 */ |
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- | 111 | cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */ |
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- | 112 | break; |
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- | 113 | case 2: /* IRQ0 */ |
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- | 114 | case KEYBOARD_IRQ: |
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- | 115 | keyboard(); |
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- | 116 | break; |
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- | 117 | case 4: /* IRQ2 */ |
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- | 118 | case 5: /* IRQ3 */ |
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- | 119 | case 6: /* IRQ4 */ |
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- | 120 | default: |
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- | 121 | print_regdump(pstate); |
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- | 122 | panic("unhandled interrupt %d\n", i); |
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- | 123 | break; |
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- | 124 | case TIMER_IRQ: |
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- | 125 | /* clear timer interrupt & set new */ |
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- | 126 | cp0_compare_write(cp0_count_read() + cp0_compare_value); |
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- | 127 | clock(); |
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- | 128 | break; |
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- | 129 | } |
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- | 130 | } |
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- | 131 | } |
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- | 132 | ||
- | 133 | } |