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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 2162 | stepan | 1 | /* |
| 2 | * Copyright (c) 2007 Petr Stepan |
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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 | |||
| 4377 | svoboda | 29 | /** @addtogroup arm32 |
| 2162 | stepan | 30 | * @{ |
| 31 | */ |
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| 32 | /** |
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| 33 | * @file |
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| 2410 | stepan | 34 | * @brief Utilities for convenient manipulation with ARM registers. |
| 2162 | stepan | 35 | */ |
| 36 | |||
| 37 | #ifndef KERN_arm32_REGUTILS_H_ |
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| 38 | #define KERN_arm32_REGUTILS_H_ |
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| 39 | |||
| 2329 | kebrt | 40 | #define STATUS_REG_IRQ_DISABLED_BIT (1 << 7) |
| 41 | #define STATUS_REG_MODE_MASK 0x1f |
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| 2262 | stepan | 42 | |
| 2329 | kebrt | 43 | #define CP15_R1_HIGH_VECTORS_BIT (1 << 13) |
| 2262 | stepan | 44 | |
| 2329 | kebrt | 45 | |
| 2176 | stepan | 46 | /* ARM Processor Operation Modes */ |
| 2329 | kebrt | 47 | #define USER_MODE 0x10 |
| 48 | #define FIQ_MODE 0x11 |
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| 49 | #define IRQ_MODE 0x12 |
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| 50 | #define SUPERVISOR_MODE 0x13 |
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| 51 | #define ABORT_MODE 0x17 |
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| 52 | #define UNDEFINED_MODE 0x1b |
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| 53 | #define SYSTEM_MODE 0x1f |
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| 2176 | stepan | 54 | |
| 55 | /* [CS]PRS manipulation macros */ |
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| 56 | #define GEN_STATUS_READ(nm,reg) \ |
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| 2464 | jermar | 57 | static inline uint32_t nm## _status_reg_read(void) \ |
| 58 | { \ |
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| 59 | uint32_t retval; \ |
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| 4377 | svoboda | 60 | asm volatile( \ |
| 61 | "mrs %[retval], " #reg \ |
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| 62 | : [retval] "=r" (retval) \ |
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| 63 | ); \ |
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| 2464 | jermar | 64 | return retval; \ |
| 65 | } |
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| 2176 | stepan | 66 | |
| 67 | #define GEN_STATUS_WRITE(nm,reg,fieldname, field) \ |
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| 2464 | jermar | 68 | static inline void nm## _status_reg_ ##fieldname## _write(uint32_t value) \ |
| 69 | { \ |
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| 4377 | svoboda | 70 | asm volatile( \ |
| 71 | "msr " #reg "_" #field ", %[value]" \ |
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| 72 | :: [value] "r" (value) \ |
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| 73 | ); \ |
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| 2464 | jermar | 74 | } |
| 2176 | stepan | 75 | |
| 76 | |||
| 2329 | kebrt | 77 | /** Returns the value of CPSR (Current Program Status Register). */ |
| 2176 | stepan | 78 | GEN_STATUS_READ(current, cpsr) |
| 2162 | stepan | 79 | |
| 2176 | stepan | 80 | |
| 2329 | kebrt | 81 | /** Sets control bits of CPSR. */ |
| 2176 | stepan | 82 | GEN_STATUS_WRITE(current, cpsr, control, c); |
| 83 | |||
| 84 | |||
| 2329 | kebrt | 85 | /** Returns the value of SPSR (Saved Program Status Register). */ |
| 2176 | stepan | 86 | GEN_STATUS_READ(saved, spsr) |
| 87 | |||
| 88 | |||
| 2162 | stepan | 89 | #endif |
| 90 | |||
| 91 | /** @} |
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| 92 | */ |