Rev 4651 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2162 | stepan | 1 | /* |
| 2245 | stepan | 2 | * Copyright (c) 2007 Petr Stepan |
| 2162 | stepan | 3 | * All rights reserved. |
| 4 | * |
||
| 5 | * Redistribution and use in source and binary forms, with or without |
||
| 6 | * modification, are permitted provided that the following conditions |
||
| 7 | * are met: |
||
| 8 | * |
||
| 9 | * - Redistributions of source code must retain the above copyright |
||
| 10 | * notice, this list of conditions and the following disclaimer. |
||
| 11 | * - Redistributions in binary form must reproduce the above copyright |
||
| 12 | * notice, this list of conditions and the following disclaimer in the |
||
| 13 | * documentation and/or other materials provided with the distribution. |
||
| 14 | * - The name of the author may not be used to endorse or promote products |
||
| 15 | * derived from this software without specific prior written permission. |
||
| 16 | * |
||
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
||
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
||
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
||
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
||
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
||
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
||
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||
| 27 | */ |
||
| 28 | |||
| 29 | /** @addtogroup arm32 |
||
| 30 | * @{ |
||
| 31 | */ |
||
| 32 | /** @file |
||
| 2410 | stepan | 33 | * @brief Interrupts controlling routines. |
| 2162 | stepan | 34 | */ |
| 35 | |||
| 2214 | kebrt | 36 | #include <arch/asm.h> |
| 37 | #include <arch/regutils.h> |
||
| 4651 | pillai | 38 | #include <arch/machine.h> |
| 2245 | stepan | 39 | #include <ddi/irq.h> |
| 4117 | decky | 40 | #include <ddi/device.h> |
| 2214 | kebrt | 41 | #include <interrupt.h> |
| 2162 | stepan | 42 | |
| 2407 | stepan | 43 | /** Initial size of a table holding interrupt handlers. */ |
| 2245 | stepan | 44 | #define IRQ_COUNT 8 |
| 2162 | stepan | 45 | |
| 46 | /** Disable interrupts. |
||
| 47 | * |
||
| 48 | * @return Old interrupt priority level. |
||
| 49 | */ |
||
| 50 | ipl_t interrupts_disable(void) |
||
| 51 | { |
||
| 2177 | stepan | 52 | ipl_t ipl = current_status_reg_read(); |
| 4651 | pillai | 53 | |
| 2312 | stepan | 54 | current_status_reg_control_write(STATUS_REG_IRQ_DISABLED_BIT | ipl); |
| 2162 | stepan | 55 | |
| 56 | return ipl; |
||
| 57 | } |
||
| 58 | |||
| 59 | /** Enable interrupts. |
||
| 60 | * |
||
| 61 | * @return Old interrupt priority level. |
||
| 62 | */ |
||
| 63 | ipl_t interrupts_enable(void) |
||
| 64 | { |
||
| 2177 | stepan | 65 | ipl_t ipl = current_status_reg_read(); |
| 4651 | pillai | 66 | |
| 67 | /* |
||
| 68 | * Current implementation of interrupt handling is non-nested mode. |
||
| 69 | * So we don't enable interrupt if servicing IRQ. |
||
| 70 | * ToDo: Re-implement interrupt handling to handle nested interrupts. |
||
| 71 | */ |
||
| 4652 | pillai | 72 | if ((ipl & 0x1f) != UNDEFINED_MODE) |
| 4651 | pillai | 73 | current_status_reg_control_write(ipl & ~STATUS_REG_IRQ_DISABLED_BIT); |
| 4117 | decky | 74 | |
| 2162 | stepan | 75 | return ipl; |
| 76 | } |
||
| 77 | |||
| 78 | /** Restore interrupt priority level. |
||
| 79 | * |
||
| 80 | * @param ipl Saved interrupt priority level. |
||
| 81 | */ |
||
| 82 | void interrupts_restore(ipl_t ipl) |
||
| 83 | { |
||
| 2343 | stepan | 84 | current_status_reg_control_write( |
| 2464 | jermar | 85 | (current_status_reg_read() & ~STATUS_REG_IRQ_DISABLED_BIT) | |
| 86 | (ipl & STATUS_REG_IRQ_DISABLED_BIT)); |
||
| 2162 | stepan | 87 | } |
| 88 | |||
| 89 | /** Read interrupt priority level. |
||
| 90 | * |
||
| 91 | * @return Current interrupt priority level. |
||
| 92 | */ |
||
| 93 | ipl_t interrupts_read(void) |
||
| 94 | { |
||
| 2177 | stepan | 95 | return current_status_reg_read(); |
| 2162 | stepan | 96 | } |
| 97 | |||
| 2245 | stepan | 98 | /** Initialize basic tables for exception dispatching |
| 99 | * and starts the timer. |
||
| 100 | */ |
||
| 101 | void interrupt_init(void) |
||
| 102 | { |
||
| 2214 | kebrt | 103 | irq_init(IRQ_COUNT, IRQ_COUNT); |
| 4651 | pillai | 104 | machine_timer_irq_start(); |
| 4117 | decky | 105 | |
| 2214 | kebrt | 106 | } |
| 107 | |||
| 2162 | stepan | 108 | /** @} |
| 109 | */ |