Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: include/asm/system.h |
| 3 | * Based on: |
| 4 | * Author: Tony Kou (tonyko@lineo.ca) |
| 5 | * Copyright (c) 2002 Arcturus Networks Inc. |
| 6 | * (www.arcturusnetworks.com) |
| 7 | * Copyright (c) 2003 Metrowerks (www.metrowerks.com) |
| 8 | * Copyright (c) 2004 Analog Device Inc. |
| 9 | * Created: 25Jan2001 - Tony Kou |
| 10 | * Description: system.h include file |
| 11 | * |
| 12 | * Modified: 22Sep2006 - Robin Getz |
| 13 | * - move include blackfin.h down, so I can get access to |
| 14 | * irq functions in other include files. |
| 15 | * |
| 16 | * Bugs: Enter bugs at http://blackfin.uclinux.org/ |
| 17 | * |
| 18 | * This program is free software; you can redistribute it and/or modify |
| 19 | * it under the terms of the GNU General Public License as published by |
| 20 | * the Free Software Foundation; either version 2, or (at your option) |
| 21 | * any later version. |
| 22 | * |
| 23 | * This program is distributed in the hope that it will be useful, |
| 24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 26 | * GNU General Public License for more details. |
| 27 | * |
| 28 | * You should have received a copy of the GNU General Public License |
| 29 | * along with this program; see the file COPYING. |
| 30 | * If not, write to the Free Software Foundation, |
| 31 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 32 | */ |
| 33 | |
| 34 | #ifndef _BLACKFIN_SYSTEM_H |
| 35 | #define _BLACKFIN_SYSTEM_H |
| 36 | |
| 37 | #include <linux/linkage.h> |
| 38 | #include <linux/compiler.h> |
| 39 | |
| 40 | /* |
| 41 | * Interrupt configuring macros. |
| 42 | */ |
| 43 | |
| 44 | extern unsigned long irq_flags; |
| 45 | |
| 46 | #define local_irq_enable() do { \ |
| 47 | __asm__ __volatile__ ( \ |
| 48 | "sti %0;" \ |
| 49 | ::"d"(irq_flags)); \ |
| 50 | } while (0) |
| 51 | |
| 52 | #define local_irq_disable() do { \ |
| 53 | int _tmp_dummy; \ |
| 54 | __asm__ __volatile__ ( \ |
| 55 | "cli %0;" \ |
| 56 | :"=d" (_tmp_dummy):); \ |
| 57 | } while (0) |
| 58 | |
| 59 | #if defined(ANOMALY_05000244) && defined (CONFIG_BLKFIN_CACHE) |
| 60 | #define idle_with_irq_disabled() do { \ |
| 61 | __asm__ __volatile__ ( \ |
| 62 | "nop; nop;\n" \ |
| 63 | ".align 8;\n" \ |
| 64 | "sti %0; idle;\n" \ |
| 65 | ::"d" (irq_flags)); \ |
| 66 | } while (0) |
| 67 | #else |
| 68 | #define idle_with_irq_disabled() do { \ |
| 69 | __asm__ __volatile__ ( \ |
| 70 | ".align 8;\n" \ |
| 71 | "sti %0; idle;\n" \ |
| 72 | ::"d" (irq_flags)); \ |
| 73 | } while (0) |
| 74 | #endif |
| 75 | |
| 76 | #ifdef CONFIG_DEBUG_HWERR |
| 77 | #define __save_and_cli(x) do { \ |
| 78 | __asm__ __volatile__ ( \ |
| 79 | "cli %0;\n\tsti %1;" \ |
| 80 | :"=&d"(x): "d" (0x3F)); \ |
| 81 | } while (0) |
| 82 | #else |
| 83 | #define __save_and_cli(x) do { \ |
| 84 | __asm__ __volatile__ ( \ |
| 85 | "cli %0;" \ |
| 86 | :"=&d"(x):); \ |
| 87 | } while (0) |
| 88 | #endif |
| 89 | |
| 90 | #define local_save_flags(x) asm volatile ("cli %0;" \ |
| 91 | "sti %0;" \ |
| 92 | :"=d"(x):); |
| 93 | |
| 94 | #ifdef CONFIG_DEBUG_HWERR |
| 95 | #define irqs_enabled_from_flags(x) (((x) & ~0x3f) != 0) |
| 96 | #else |
| 97 | #define irqs_enabled_from_flags(x) ((x) != 0x1f) |
| 98 | #endif |
| 99 | |
| 100 | #define local_irq_restore(x) do { \ |
| 101 | if (irqs_enabled_from_flags(x)) \ |
| 102 | local_irq_enable (); \ |
| 103 | } while (0) |
| 104 | |
| 105 | /* For spinlocks etc */ |
| 106 | #define local_irq_save(x) __save_and_cli(x) |
| 107 | |
| 108 | #define irqs_disabled() \ |
| 109 | ({ \ |
| 110 | unsigned long flags; \ |
| 111 | local_save_flags(flags); \ |
| 112 | !irqs_enabled_from_flags(flags); \ |
| 113 | }) |
| 114 | |
| 115 | /* |
| 116 | * Force strict CPU ordering. |
| 117 | */ |
| 118 | #define nop() asm volatile ("nop;\n\t"::) |
| 119 | #define mb() asm volatile ("" : : :"memory") |
| 120 | #define rmb() asm volatile ("" : : :"memory") |
| 121 | #define wmb() asm volatile ("" : : :"memory") |
| 122 | #define set_rmb(var, value) do { (void) xchg(&var, value); } while (0) |
| 123 | #define set_mb(var, value) set_rmb(var, value) |
| 124 | #define set_wmb(var, value) do { var = value; wmb(); } while (0) |
| 125 | |
| 126 | #define read_barrier_depends() do { } while(0) |
| 127 | |
| 128 | #ifdef CONFIG_SMP |
| 129 | #define smp_mb() mb() |
| 130 | #define smp_rmb() rmb() |
| 131 | #define smp_wmb() wmb() |
| 132 | #define smp_read_barrier_depends() read_barrier_depends() |
| 133 | #else |
| 134 | #define smp_mb() barrier() |
| 135 | #define smp_rmb() barrier() |
| 136 | #define smp_wmb() barrier() |
| 137 | #define smp_read_barrier_depends() do { } while(0) |
| 138 | #endif |
| 139 | |
| 140 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 141 | |
| 142 | struct __xchg_dummy { |
| 143 | unsigned long a[100]; |
| 144 | }; |
| 145 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) |
| 146 | |
| 147 | static inline unsigned long __xchg(unsigned long x, volatile void *ptr, |
| 148 | int size) |
| 149 | { |
| 150 | unsigned long tmp = 0; |
| 151 | unsigned long flags = 0; |
| 152 | |
| 153 | local_irq_save(flags); |
| 154 | |
| 155 | switch (size) { |
| 156 | case 1: |
| 157 | __asm__ __volatile__ |
| 158 | ("%0 = b%2 (z);\n\t" |
| 159 | "b%2 = %1;\n\t" |
| 160 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 161 | break; |
| 162 | case 2: |
| 163 | __asm__ __volatile__ |
| 164 | ("%0 = w%2 (z);\n\t" |
| 165 | "w%2 = %1;\n\t" |
| 166 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 167 | break; |
| 168 | case 4: |
| 169 | __asm__ __volatile__ |
| 170 | ("%0 = %2;\n\t" |
| 171 | "%2 = %1;\n\t" |
| 172 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 173 | break; |
| 174 | } |
| 175 | local_irq_restore(flags); |
| 176 | return tmp; |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Atomic compare and exchange. Compare OLD with MEM, if identical, |
| 181 | * store NEW in MEM. Return the initial value in MEM. Success is |
| 182 | * indicated by comparing RETURN with OLD. |
| 183 | */ |
| 184 | static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old, |
| 185 | unsigned long new, int size) |
| 186 | { |
| 187 | unsigned long tmp = 0; |
| 188 | unsigned long flags = 0; |
| 189 | |
| 190 | local_irq_save(flags); |
| 191 | |
| 192 | switch (size) { |
| 193 | case 1: |
| 194 | __asm__ __volatile__ |
| 195 | ("%0 = b%3 (z);\n\t" |
| 196 | "CC = %1 == %0;\n\t" |
| 197 | "IF !CC JUMP 1f;\n\t" |
| 198 | "b%3 = %2;\n\t" |
| 199 | "1:\n\t" |
| 200 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); |
| 201 | break; |
| 202 | case 2: |
| 203 | __asm__ __volatile__ |
| 204 | ("%0 = w%3 (z);\n\t" |
| 205 | "CC = %1 == %0;\n\t" |
| 206 | "IF !CC JUMP 1f;\n\t" |
| 207 | "w%3 = %2;\n\t" |
| 208 | "1:\n\t" |
| 209 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); |
| 210 | break; |
| 211 | case 4: |
| 212 | __asm__ __volatile__ |
| 213 | ("%0 = %3;\n\t" |
| 214 | "CC = %1 == %0;\n\t" |
| 215 | "IF !CC JUMP 1f;\n\t" |
| 216 | "%3 = %2;\n\t" |
| 217 | "1:\n\t" |
| 218 | : "=&d" (tmp) : "d" (old), "d" (new), "m" (*__xg(ptr)) : "memory"); |
| 219 | break; |
| 220 | } |
| 221 | local_irq_restore(flags); |
| 222 | return tmp; |
| 223 | } |
| 224 | |
| 225 | #define cmpxchg(ptr,o,n)\ |
| 226 | ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\ |
| 227 | (unsigned long)(n),sizeof(*(ptr)))) |
| 228 | |
| 229 | #define prepare_to_switch() do { } while(0) |
| 230 | |
| 231 | /* |
| 232 | * switch_to(n) should switch tasks to task ptr, first checking that |
| 233 | * ptr isn't the current task, in which case it does nothing. |
| 234 | */ |
| 235 | |
| 236 | #include <asm/blackfin.h> |
| 237 | |
| 238 | asmlinkage struct task_struct *resume(struct task_struct *prev, struct task_struct *next); |
| 239 | |
| 240 | #define switch_to(prev,next,last) \ |
| 241 | do { \ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame^] | 242 | memcpy (&task_thread_info(prev)->l1_task_info, L1_SCRATCH_TASK_INFO, \ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 243 | sizeof *L1_SCRATCH_TASK_INFO); \ |
Roman Zippel | f7e4217 | 2007-05-09 02:35:17 -0700 | [diff] [blame^] | 244 | memcpy (L1_SCRATCH_TASK_INFO, &task_thread_info(next)->l1_task_info, \ |
Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 245 | sizeof *L1_SCRATCH_TASK_INFO); \ |
| 246 | (last) = resume (prev, next); \ |
| 247 | } while (0) |
| 248 | |
| 249 | #endif /* _BLACKFIN_SYSTEM_H */ |