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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 | |||
| 575 | palkovsky | 29 | #include <interrupt.h> |
| 1 | jermar | 30 | #include <arch/interrupt.h> |
| 31 | #include <arch/types.h> |
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| 32 | #include <arch.h> |
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| 33 | #include <arch/cp0.h> |
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| 34 | #include <time/clock.h> |
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| 332 | palkovsky | 35 | #include <arch/drivers/arc.h> |
| 1 | jermar | 36 | |
| 413 | jermar | 37 | /** Disable interrupts. |
| 38 | * |
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| 39 | * @return Old interrupt priority level. |
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| 40 | */ |
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| 41 | ipl_t interrupts_disable(void) |
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| 1 | jermar | 42 | { |
| 413 | jermar | 43 | ipl_t ipl = (ipl_t) cp0_status_read(); |
| 44 | cp0_status_write(ipl & ~cp0_status_ie_enabled_bit); |
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| 45 | return ipl; |
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| 1 | jermar | 46 | } |
| 47 | |||
| 413 | jermar | 48 | /** Enable interrupts. |
| 49 | * |
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| 50 | * @return Old interrupt priority level. |
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| 51 | */ |
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| 52 | ipl_t interrupts_enable(void) |
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| 1 | jermar | 53 | { |
| 413 | jermar | 54 | ipl_t ipl = (ipl_t) cp0_status_read(); |
| 55 | cp0_status_write(ipl | cp0_status_ie_enabled_bit); |
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| 56 | return ipl; |
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| 1 | jermar | 57 | } |
| 58 | |||
| 413 | jermar | 59 | /** Restore interrupt priority level. |
| 60 | * |
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| 61 | * @param ipl Saved interrupt priority level. |
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| 62 | */ |
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| 63 | void interrupts_restore(ipl_t ipl) |
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| 1 | jermar | 64 | { |
| 413 | jermar | 65 | cp0_status_write(cp0_status_read() | (ipl & cp0_status_ie_enabled_bit)); |
| 1 | jermar | 66 | } |
| 67 | |||
| 413 | jermar | 68 | /** Read interrupt priority level. |
| 69 | * |
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| 70 | * @return Current interrupt priority level. |
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| 71 | */ |
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| 72 | ipl_t interrupts_read(void) |
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| 1 | jermar | 73 | { |
| 125 | jermar | 74 | return cp0_status_read(); |
| 1 | jermar | 75 | } |
| 76 | |||
| 575 | palkovsky | 77 | static void timer_exception(int n, void *stack) |
| 78 | { |
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| 79 | cp0_compare_write(cp0_count_read() + cp0_compare_value); |
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| 80 | clock(); |
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| 81 | } |
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| 82 | |||
| 83 | static void swint0(int n, void *stack) |
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| 84 | { |
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| 85 | cp0_cause_write(cp0_cause_read() & ~(1 << 8)); /* clear SW0 interrupt */ |
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| 86 | } |
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| 87 | |||
| 88 | static void swint1(int n, void *stack) |
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| 89 | { |
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| 90 | cp0_cause_write(cp0_cause_read() & ~(1 << 9)); /* clear SW1 interrupt */ |
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| 91 | } |
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| 92 | |||
| 93 | /* Initialize basic tables for exception dispatching */ |
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| 94 | void interrupt_init(void) |
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| 95 | { |
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| 96 | int i; |
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| 97 | |||
| 590 | palkovsky | 98 | int_register(TIMER_IRQ, "timer", timer_exception); |
| 99 | int_register(0, "swint0", swint0); |
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| 100 | int_register(1, "swint1", swint1); |
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| 1 | jermar | 101 | } |