Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* system.h: FR-V CPU control definitions |
| 2 | * |
| 3 | * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved. |
| 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _ASM_SYSTEM_H |
| 13 | #define _ASM_SYSTEM_H |
| 14 | |
| 15 | #include <linux/config.h> /* get configuration macros */ |
| 16 | #include <linux/linkage.h> |
| 17 | #include <asm/atomic.h> |
| 18 | |
| 19 | struct thread_struct; |
| 20 | |
| 21 | #define prepare_to_switch() do { } while(0) |
| 22 | |
| 23 | /* |
| 24 | * switch_to(prev, next) should switch from task `prev' to `next' |
| 25 | * `prev' will never be the same as `next'. |
| 26 | * The `mb' is to tell GCC not to cache `current' across this call. |
| 27 | */ |
| 28 | extern asmlinkage |
| 29 | struct task_struct *__switch_to(struct thread_struct *prev_thread, |
| 30 | struct thread_struct *next_thread, |
| 31 | struct task_struct *prev); |
| 32 | |
| 33 | #define switch_to(prev, next, last) \ |
| 34 | do { \ |
| 35 | (prev)->thread.sched_lr = \ |
| 36 | (unsigned long) __builtin_return_address(0); \ |
| 37 | (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \ |
| 38 | mb(); \ |
| 39 | } while(0) |
| 40 | |
| 41 | /* |
| 42 | * interrupt flag manipulation |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 43 | * - use virtual interrupt management since touching the PSR is slow |
| 44 | * - ICC2.Z: T if interrupts virtually disabled |
| 45 | * - ICC2.C: F if interrupts really disabled |
| 46 | * - if Z==1 upon interrupt: |
| 47 | * - C is set to 0 |
| 48 | * - interrupts are really disabled |
| 49 | * - entry.S returns immediately |
| 50 | * - uses TIHI (TRAP if Z==0 && C==0) #2 to really reenable interrupts |
| 51 | * - if taken, the trap: |
| 52 | * - sets ICC2.C |
| 53 | * - enables interrupts |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | */ |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 55 | #define local_irq_disable() \ |
| 56 | do { \ |
| 57 | /* set Z flag, but don't change the C flag */ \ |
| 58 | asm volatile(" andcc gr0,gr0,gr0,icc2 \n" \ |
| 59 | : \ |
| 60 | : \ |
| 61 | : "memory", "icc2" \ |
| 62 | ); \ |
| 63 | } while(0) |
| 64 | |
| 65 | #define local_irq_enable() \ |
| 66 | do { \ |
| 67 | /* clear Z flag and then test the C flag */ \ |
| 68 | asm volatile(" oricc gr0,#1,gr0,icc2 \n" \ |
| 69 | " tihi icc2,gr0,#2 \n" \ |
| 70 | : \ |
| 71 | : \ |
| 72 | : "memory", "icc2" \ |
| 73 | ); \ |
| 74 | } while(0) |
| 75 | |
| 76 | #define local_save_flags(flags) \ |
| 77 | do { \ |
| 78 | typecheck(unsigned long, flags); \ |
| 79 | asm volatile("movsg ccr,%0" \ |
| 80 | : "=r"(flags) \ |
| 81 | : \ |
| 82 | : "memory"); \ |
| 83 | \ |
| 84 | /* shift ICC2.Z to bit 0 */ \ |
| 85 | flags >>= 26; \ |
| 86 | \ |
| 87 | /* make flags 1 if interrupts disabled, 0 otherwise */ \ |
| 88 | flags &= 1UL; \ |
| 89 | } while(0) |
| 90 | |
| 91 | #define irqs_disabled() \ |
| 92 | ({unsigned long flags; local_save_flags(flags); flags; }) |
| 93 | |
| 94 | #define local_irq_save(flags) \ |
| 95 | do { \ |
| 96 | typecheck(unsigned long, flags); \ |
| 97 | local_save_flags(flags); \ |
| 98 | local_irq_disable(); \ |
| 99 | } while(0) |
| 100 | |
| 101 | #define local_irq_restore(flags) \ |
| 102 | do { \ |
| 103 | typecheck(unsigned long, flags); \ |
| 104 | \ |
| 105 | /* load the Z flag by turning 1 if disabled into 0 if disabled \ |
| 106 | * and thus setting the Z flag but not the C flag */ \ |
| 107 | asm volatile(" xoricc %0,#1,gr0,icc2 \n" \ |
| 108 | /* then test Z=0 and C=0 */ \ |
| 109 | " tihi icc2,gr0,#2 \n" \ |
| 110 | : \ |
| 111 | : "r"(flags) \ |
| 112 | : "memory", "icc2" \ |
| 113 | ); \ |
| 114 | \ |
| 115 | } while(0) |
| 116 | |
| 117 | /* |
| 118 | * real interrupt flag manipulation |
| 119 | */ |
| 120 | #define __local_irq_disable() \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | do { \ |
| 122 | unsigned long psr; \ |
| 123 | asm volatile(" movsg psr,%0 \n" \ |
| 124 | " andi %0,%2,%0 \n" \ |
| 125 | " ori %0,%1,%0 \n" \ |
| 126 | " movgs %0,psr \n" \ |
| 127 | : "=r"(psr) \ |
| 128 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ |
| 129 | : "memory"); \ |
| 130 | } while(0) |
| 131 | |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 132 | #define __local_irq_enable() \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | do { \ |
| 134 | unsigned long psr; \ |
| 135 | asm volatile(" movsg psr,%0 \n" \ |
| 136 | " andi %0,%1,%0 \n" \ |
| 137 | " movgs %0,psr \n" \ |
| 138 | : "=r"(psr) \ |
| 139 | : "i" (~PSR_PIL) \ |
| 140 | : "memory"); \ |
| 141 | } while(0) |
| 142 | |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 143 | #define __local_save_flags(flags) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | do { \ |
| 145 | typecheck(unsigned long, flags); \ |
| 146 | asm("movsg psr,%0" \ |
| 147 | : "=r"(flags) \ |
| 148 | : \ |
| 149 | : "memory"); \ |
| 150 | } while(0) |
| 151 | |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 152 | #define __local_irq_save(flags) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | do { \ |
| 154 | unsigned long npsr; \ |
| 155 | typecheck(unsigned long, flags); \ |
| 156 | asm volatile(" movsg psr,%0 \n" \ |
| 157 | " andi %0,%3,%1 \n" \ |
| 158 | " ori %1,%2,%1 \n" \ |
| 159 | " movgs %1,psr \n" \ |
| 160 | : "=r"(flags), "=r"(npsr) \ |
| 161 | : "i" (PSR_PIL_14), "i" (~PSR_PIL) \ |
| 162 | : "memory"); \ |
| 163 | } while(0) |
| 164 | |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 165 | #define __local_irq_restore(flags) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | do { \ |
| 167 | typecheck(unsigned long, flags); \ |
| 168 | asm volatile(" movgs %0,psr \n" \ |
| 169 | : \ |
| 170 | : "r" (flags) \ |
| 171 | : "memory"); \ |
| 172 | } while(0) |
| 173 | |
David Howells | 28baeba | 2006-02-14 13:53:20 -0800 | [diff] [blame] | 174 | #define __irqs_disabled() \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | ((__get_PSR() & PSR_PIL) >= PSR_PIL_14) |
| 176 | |
| 177 | /* |
| 178 | * Force strict CPU ordering. |
| 179 | */ |
| 180 | #define nop() asm volatile ("nop"::) |
| 181 | #define mb() asm volatile ("membar" : : :"memory") |
| 182 | #define rmb() asm volatile ("membar" : : :"memory") |
| 183 | #define wmb() asm volatile ("membar" : : :"memory") |
| 184 | #define set_mb(var, value) do { var = value; mb(); } while (0) |
| 185 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) |
| 186 | |
| 187 | #define smp_mb() mb() |
| 188 | #define smp_rmb() rmb() |
| 189 | #define smp_wmb() wmb() |
| 190 | |
| 191 | #define read_barrier_depends() do {} while(0) |
| 192 | #define smp_read_barrier_depends() read_barrier_depends() |
| 193 | |
| 194 | #define HARD_RESET_NOW() \ |
| 195 | do { \ |
| 196 | cli(); \ |
| 197 | } while(1) |
| 198 | |
| 199 | extern void die_if_kernel(const char *, ...) __attribute__((format(printf, 1, 2))); |
| 200 | extern void free_initmem(void); |
| 201 | |
| 202 | #define arch_align_stack(x) (x) |
| 203 | |
| 204 | #endif /* _ASM_SYSTEM_H */ |