| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1994, 95, 96, 97, 98, 99, 2003 by Ralf Baechle |
| 7 | * Copyright (C) 1996 by Paul M. Antoine |
| 8 | * Copyright (C) 1999 Silicon Graphics |
| 9 | * Copyright (C) 2000 MIPS Technologies, Inc. |
| 10 | */ |
| 11 | #ifndef _ASM_INTERRUPT_H |
| 12 | #define _ASM_INTERRUPT_H |
| 13 | |
| 14 | #include <asm/hazards.h> |
| 15 | |
| 16 | __asm__ ( |
| 17 | ".macro\tlocal_irq_enable\n\t" |
| 18 | ".set\tpush\n\t" |
| 19 | ".set\treorder\n\t" |
| 20 | ".set\tnoat\n\t" |
| 21 | "mfc0\t$1,$12\n\t" |
| 22 | "ori\t$1,0x1f\n\t" |
| 23 | "xori\t$1,0x1e\n\t" |
| 24 | "mtc0\t$1,$12\n\t" |
| 25 | "irq_enable_hazard\n\t" |
| 26 | ".set\tpop\n\t" |
| 27 | ".endm"); |
| 28 | |
| 29 | static inline void local_irq_enable(void) |
| 30 | { |
| 31 | __asm__ __volatile__( |
| 32 | "local_irq_enable" |
| 33 | : /* no outputs */ |
| 34 | : /* no inputs */ |
| 35 | : "memory"); |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * For cli() we have to insert nops to make sure that the new value |
| 40 | * has actually arrived in the status register before the end of this |
| 41 | * macro. |
| 42 | * R4000/R4400 need three nops, the R4600 two nops and the R10000 needs |
| 43 | * no nops at all. |
| 44 | */ |
| 45 | __asm__ ( |
| 46 | ".macro\tlocal_irq_disable\n\t" |
| 47 | ".set\tpush\n\t" |
| 48 | ".set\tnoat\n\t" |
| 49 | "mfc0\t$1,$12\n\t" |
| 50 | "ori\t$1,1\n\t" |
| 51 | "xori\t$1,1\n\t" |
| 52 | ".set\tnoreorder\n\t" |
| 53 | "mtc0\t$1,$12\n\t" |
| 54 | "irq_disable_hazard\n\t" |
| 55 | ".set\tpop\n\t" |
| 56 | ".endm"); |
| 57 | |
| 58 | static inline void local_irq_disable(void) |
| 59 | { |
| 60 | __asm__ __volatile__( |
| 61 | "local_irq_disable" |
| 62 | : /* no outputs */ |
| 63 | : /* no inputs */ |
| 64 | : "memory"); |
| 65 | } |
| 66 | |
| 67 | __asm__ ( |
| 68 | ".macro\tlocal_save_flags flags\n\t" |
| 69 | ".set\tpush\n\t" |
| 70 | ".set\treorder\n\t" |
| 71 | "mfc0\t\\flags, $12\n\t" |
| 72 | ".set\tpop\n\t" |
| 73 | ".endm"); |
| 74 | |
| 75 | #define local_save_flags(x) \ |
| 76 | __asm__ __volatile__( \ |
| 77 | "local_save_flags %0" \ |
| 78 | : "=r" (x)) |
| 79 | |
| 80 | __asm__ ( |
| 81 | ".macro\tlocal_irq_save result\n\t" |
| 82 | ".set\tpush\n\t" |
| 83 | ".set\treorder\n\t" |
| 84 | ".set\tnoat\n\t" |
| 85 | "mfc0\t\\result, $12\n\t" |
| 86 | "ori\t$1, \\result, 1\n\t" |
| 87 | "xori\t$1, 1\n\t" |
| 88 | ".set\tnoreorder\n\t" |
| 89 | "mtc0\t$1, $12\n\t" |
| 90 | "irq_disable_hazard\n\t" |
| 91 | ".set\tpop\n\t" |
| 92 | ".endm"); |
| 93 | |
| 94 | #define local_irq_save(x) \ |
| 95 | __asm__ __volatile__( \ |
| 96 | "local_irq_save\t%0" \ |
| 97 | : "=r" (x) \ |
| 98 | : /* no inputs */ \ |
| 99 | : "memory") |
| 100 | |
| 101 | __asm__ ( |
| 102 | ".macro\tlocal_irq_restore flags\n\t" |
| 103 | ".set\tnoreorder\n\t" |
| 104 | ".set\tnoat\n\t" |
| 105 | "mfc0\t$1, $12\n\t" |
| 106 | "andi\t\\flags, 1\n\t" |
| 107 | "ori\t$1, 1\n\t" |
| 108 | "xori\t$1, 1\n\t" |
| 109 | "or\t\\flags, $1\n\t" |
| 110 | "mtc0\t\\flags, $12\n\t" |
| 111 | "irq_disable_hazard\n\t" |
| 112 | ".set\tat\n\t" |
| 113 | ".set\treorder\n\t" |
| 114 | ".endm"); |
| 115 | |
| 116 | #define local_irq_restore(flags) \ |
| 117 | do { \ |
| 118 | unsigned long __tmp1; \ |
| 119 | \ |
| 120 | __asm__ __volatile__( \ |
| 121 | "local_irq_restore\t%0" \ |
| 122 | : "=r" (__tmp1) \ |
| 123 | : "0" (flags) \ |
| 124 | : "memory"); \ |
| 125 | } while(0) |
| 126 | |
| 127 | #define irqs_disabled() \ |
| 128 | ({ \ |
| 129 | unsigned long flags; \ |
| 130 | local_save_flags(flags); \ |
| 131 | !(flags & 1); \ |
| 132 | }) |
| 133 | |
| 134 | #endif /* _ASM_INTERRUPT_H */ |