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| Rev | Author | Line No. | Line |
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| 1 | jermar | 1 | /* |
| 319 | jermar | 2 | * Copyright (C) 2003-2004 Jakub Jermar |
| 1 | jermar | 3 | * All rights reserved. |
| 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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| 332 | palkovsky | 35 | #include <print.h> |
| 36 | #include <symtab.h> |
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| 37 | #include <arch/drivers/arc.h> |
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| 509 | jermar | 38 | #include <arch/drivers/keyboard.h> |
| 1 | jermar | 39 | |
| 332 | palkovsky | 40 | static void print_regdump(struct exception_regdump *pstate) |
| 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 | |||
| 413 | jermar | 56 | /** Disable interrupts. |
| 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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| 1 | jermar | 61 | { |
| 413 | jermar | 62 | ipl_t ipl = (ipl_t) cp0_status_read(); |
| 63 | cp0_status_write(ipl & ~cp0_status_ie_enabled_bit); |
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| 64 | return ipl; |
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| 1 | jermar | 65 | } |
| 66 | |||
| 413 | jermar | 67 | /** Enable interrupts. |
| 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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| 1 | jermar | 72 | { |
| 413 | jermar | 73 | ipl_t ipl = (ipl_t) cp0_status_read(); |
| 74 | cp0_status_write(ipl | cp0_status_ie_enabled_bit); |
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| 75 | return ipl; |
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| 1 | jermar | 76 | } |
| 77 | |||
| 413 | jermar | 78 | /** Restore interrupt priority level. |
| 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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| 1 | jermar | 83 | { |
| 413 | jermar | 84 | cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit)); |
| 1 | jermar | 85 | } |
| 86 | |||
| 413 | jermar | 87 | /** Read interrupt priority level. |
| 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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| 1 | jermar | 92 | { |
| 125 | jermar | 93 | return cp0_status_read(); |
| 1 | jermar | 94 | } |
| 95 | |||
| 332 | palkovsky | 96 | void interrupt(struct exception_regdump *pstate) |
| 1 | jermar | 97 | { |
| 98 | __u32 cause; |
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| 124 | decky | 99 | int i; |
| 100 | |||
| 1 | jermar | 101 | /* decode interrupt number and process the interrupt */ |
| 124 | decky | 102 | cause = (cp0_cause_read() >> 8) &0xff; |
| 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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| 332 | palkovsky | 108 | cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */ |
| 124 | decky | 109 | break; |
| 110 | case 1: /* SW1 - Software interrupt 1 */ |
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| 332 | palkovsky | 111 | cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */ |
| 124 | decky | 112 | break; |
| 113 | case 2: /* IRQ0 */ |
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| 509 | jermar | 114 | case KEYBOARD_IRQ: |
| 115 | keyboard(); |
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| 116 | break; |
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| 124 | decky | 117 | case 4: /* IRQ2 */ |
| 118 | case 5: /* IRQ3 */ |
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| 119 | case 6: /* IRQ4 */ |
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| 483 | jermar | 120 | default: |
| 332 | palkovsky | 121 | print_regdump(pstate); |
| 124 | decky | 122 | panic("unhandled interrupt %d\n", i); |
| 123 | break; |
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| 509 | jermar | 124 | case TIMER_IRQ: |
| 329 | palkovsky | 125 | /* clear timer interrupt & set new */ |
| 126 | cp0_compare_write(cp0_count_read() + cp0_compare_value); |
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| 124 | decky | 127 | clock(); |
| 128 | break; |
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| 129 | } |
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| 130 | } |
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| 131 | } |
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| 1 | jermar | 132 | |
| 133 | } |