Rev 2465 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
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| 2162 | stepan | 1 | /* |
| 2245 | stepan | 2 | * Copyright (c) 2007 Petr Stepan |
| 2162 | stepan | 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 | /** @addtogroup arm32 |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | /** @file |
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| 2410 | stepan | 33 | * @brief Interrupts controlling routines. |
| 2162 | stepan | 34 | */ |
| 35 | |||
| 2214 | kebrt | 36 | #include <arch/asm.h> |
| 37 | #include <arch/regutils.h> |
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| 2245 | stepan | 38 | #include <ddi/irq.h> |
| 2274 | kebrt | 39 | #include <arch/machine.h> |
| 2214 | kebrt | 40 | #include <interrupt.h> |
| 2162 | stepan | 41 | |
| 2407 | stepan | 42 | /** Initial size of a table holding interrupt handlers. */ |
| 2245 | stepan | 43 | #define IRQ_COUNT 8 |
| 2162 | stepan | 44 | |
| 45 | /** Disable interrupts. |
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| 46 | * |
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| 47 | * @return Old interrupt priority level. |
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| 48 | */ |
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| 49 | ipl_t interrupts_disable(void) |
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| 50 | { |
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| 2177 | stepan | 51 | ipl_t ipl = current_status_reg_read(); |
| 2162 | stepan | 52 | |
| 2312 | stepan | 53 | current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl); |
| 2162 | stepan | 54 | |
| 55 | return ipl; |
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| 56 | } |
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| 57 | |||
| 58 | /** Enable interrupts. |
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| 59 | * |
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| 60 | * @return Old interrupt priority level. |
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| 61 | */ |
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| 62 | ipl_t interrupts_enable(void) |
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| 63 | { |
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| 2177 | stepan | 64 | ipl_t ipl = current_status_reg_read(); |
| 2162 | stepan | 65 | |
| 2312 | stepan | 66 | current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT); |
| 2162 | stepan | 67 | |
| 68 | return ipl; |
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| 69 | } |
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| 70 | |||
| 71 | /** Restore interrupt priority level. |
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| 72 | * |
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| 73 | * @param ipl Saved interrupt priority level. |
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| 74 | */ |
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| 75 | void interrupts_restore(ipl_t ipl) |
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| 76 | { |
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| 2343 | stepan | 77 | current_status_reg_control_write( |
| 2464 | jermar | 78 | (current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) | |
| 79 | (ipl & STATUS_REG_IRQ_DISABLED_BIT)); |
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| 2162 | stepan | 80 | } |
| 81 | |||
| 82 | /** Read interrupt priority level. |
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| 83 | * |
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| 84 | * @return Current interrupt priority level. |
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| 85 | */ |
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| 86 | ipl_t interrupts_read(void) |
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| 87 | { |
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| 2177 | stepan | 88 | return current_status_reg_read(); |
| 2162 | stepan | 89 | } |
| 90 | |||
| 2245 | stepan | 91 | /** Initialize basic tables for exception dispatching |
| 92 | * and starts the timer. |
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| 93 | */ |
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| 94 | void interrupt_init(void) |
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| 95 | { |
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| 2214 | kebrt | 96 | irq_init(IRQ_COUNT, IRQ_COUNT); |
| 2274 | kebrt | 97 | machine_timer_irq_start(); |
| 2214 | kebrt | 98 | } |
| 99 | |||
| 2162 | stepan | 100 | /** @} |
| 101 | */ |