Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _M68KNOMMU_SYSTEM_H |
| 2 | #define _M68KNOMMU_SYSTEM_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/linkage.h> |
| 5 | #include <asm/segment.h> |
| 6 | #include <asm/entry.h> |
| 7 | |
| 8 | /* |
| 9 | * switch_to(n) should switch tasks to task ptr, first checking that |
| 10 | * ptr isn't the current task, in which case it does nothing. This |
| 11 | * also clears the TS-flag if the task we switched to has used the |
| 12 | * math co-processor latest. |
| 13 | */ |
| 14 | /* |
| 15 | * switch_to() saves the extra registers, that are not saved |
| 16 | * automatically by SAVE_SWITCH_STACK in resume(), ie. d0-d5 and |
| 17 | * a0-a1. Some of these are used by schedule() and its predecessors |
| 18 | * and so we might get see unexpected behaviors when a task returns |
| 19 | * with unexpected register values. |
| 20 | * |
| 21 | * syscall stores these registers itself and none of them are used |
| 22 | * by syscall after the function in the syscall has been called. |
| 23 | * |
| 24 | * Beware that resume now expects *next to be in d1 and the offset of |
| 25 | * tss to be in a1. This saves a few instructions as we no longer have |
| 26 | * to push them onto the stack and read them back right after. |
| 27 | * |
| 28 | * 02/17/96 - Jes Sorensen (jds@kom.auc.dk) |
| 29 | * |
| 30 | * Changed 96/09/19 by Andreas Schwab |
| 31 | * pass prev in a0, next in a1, offset of tss in d1, and whether |
| 32 | * the mm structures are shared in d2 (to avoid atc flushing). |
| 33 | */ |
| 34 | asmlinkage void resume(void); |
| 35 | #define switch_to(prev,next,last) \ |
| 36 | { \ |
| 37 | void *_last; \ |
| 38 | __asm__ __volatile__( \ |
| 39 | "movel %1, %%a0\n\t" \ |
| 40 | "movel %2, %%a1\n\t" \ |
| 41 | "jbsr resume\n\t" \ |
| 42 | "movel %%d1, %0\n\t" \ |
| 43 | : "=d" (_last) \ |
| 44 | : "d" (prev), "d" (next) \ |
| 45 | : "cc", "d0", "d1", "d2", "d3", "d4", "d5", "a0", "a1"); \ |
| 46 | (last) = _last; \ |
| 47 | } |
| 48 | |
| 49 | #ifdef CONFIG_COLDFIRE |
| 50 | #define local_irq_enable() __asm__ __volatile__ ( \ |
| 51 | "move %/sr,%%d0\n\t" \ |
| 52 | "andi.l #0xf8ff,%%d0\n\t" \ |
| 53 | "move %%d0,%/sr\n" \ |
| 54 | : /* no outputs */ \ |
| 55 | : \ |
| 56 | : "cc", "%d0", "memory") |
| 57 | #define local_irq_disable() __asm__ __volatile__ ( \ |
| 58 | "move %/sr,%%d0\n\t" \ |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 59 | "ori.l #0x0700,%%d0\n\t" \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | "move %%d0,%/sr\n" \ |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 61 | : /* no outputs */ \ |
| 62 | : \ |
| 63 | : "cc", "%d0", "memory") |
| 64 | /* For spinlocks etc */ |
| 65 | #define local_irq_save(x) __asm__ __volatile__ ( \ |
| 66 | "movew %%sr,%0\n\t" \ |
| 67 | "movew #0x0700,%%d0\n\t" \ |
| 68 | "or.l %0,%%d0\n\t" \ |
| 69 | "movew %%d0,%/sr" \ |
| 70 | : "=d" (x) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | : \ |
| 72 | : "cc", "%d0", "memory") |
| 73 | #else |
| 74 | |
| 75 | /* portable version */ /* FIXME - see entry.h*/ |
| 76 | #define ALLOWINT 0xf8ff |
| 77 | |
| 78 | #define local_irq_enable() asm volatile ("andiw %0,%%sr": : "i" (ALLOWINT) : "memory") |
| 79 | #define local_irq_disable() asm volatile ("oriw #0x0700,%%sr": : : "memory") |
| 80 | #endif |
| 81 | |
| 82 | #define local_save_flags(x) asm volatile ("movew %%sr,%0":"=d" (x) : : "memory") |
| 83 | #define local_irq_restore(x) asm volatile ("movew %0,%%sr": :"d" (x) : "memory") |
| 84 | |
| 85 | /* For spinlocks etc */ |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 86 | #ifndef local_irq_save |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } while (0) |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 88 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | #define irqs_disabled() \ |
| 91 | ({ \ |
| 92 | unsigned long flags; \ |
| 93 | local_save_flags(flags); \ |
| 94 | ((flags & 0x0700) == 0x0700); \ |
| 95 | }) |
| 96 | |
| 97 | #define iret() __asm__ __volatile__ ("rte": : :"memory", "sp", "cc") |
| 98 | |
| 99 | /* |
| 100 | * Force strict CPU ordering. |
| 101 | * Not really required on m68k... |
| 102 | */ |
| 103 | #define nop() asm volatile ("nop"::) |
| 104 | #define mb() asm volatile ("" : : :"memory") |
| 105 | #define rmb() asm volatile ("" : : :"memory") |
| 106 | #define wmb() asm volatile ("" : : :"memory") |
| 107 | #define set_rmb(var, value) do { xchg(&var, value); } while (0) |
| 108 | #define set_mb(var, value) set_rmb(var, value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | #ifdef CONFIG_SMP |
| 111 | #define smp_mb() mb() |
| 112 | #define smp_rmb() rmb() |
| 113 | #define smp_wmb() wmb() |
| 114 | #define smp_read_barrier_depends() read_barrier_depends() |
| 115 | #else |
| 116 | #define smp_mb() barrier() |
| 117 | #define smp_rmb() barrier() |
| 118 | #define smp_wmb() barrier() |
| 119 | #define smp_read_barrier_depends() do { } while(0) |
| 120 | #endif |
| 121 | |
| 122 | #define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | struct __xchg_dummy { unsigned long a[100]; }; |
| 125 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) |
| 126 | |
| 127 | #ifndef CONFIG_RMW_INSNS |
| 128 | static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) |
| 129 | { |
| 130 | unsigned long tmp, flags; |
| 131 | |
| 132 | local_irq_save(flags); |
| 133 | |
| 134 | switch (size) { |
| 135 | case 1: |
| 136 | __asm__ __volatile__ |
| 137 | ("moveb %2,%0\n\t" |
| 138 | "moveb %1,%2" |
| 139 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 140 | break; |
| 141 | case 2: |
| 142 | __asm__ __volatile__ |
| 143 | ("movew %2,%0\n\t" |
| 144 | "movew %1,%2" |
| 145 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 146 | break; |
| 147 | case 4: |
| 148 | __asm__ __volatile__ |
| 149 | ("movel %2,%0\n\t" |
| 150 | "movel %1,%2" |
| 151 | : "=&d" (tmp) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 152 | break; |
| 153 | } |
| 154 | local_irq_restore(flags); |
| 155 | return tmp; |
| 156 | } |
| 157 | #else |
| 158 | static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size) |
| 159 | { |
| 160 | switch (size) { |
| 161 | case 1: |
| 162 | __asm__ __volatile__ |
| 163 | ("moveb %2,%0\n\t" |
| 164 | "1:\n\t" |
| 165 | "casb %0,%1,%2\n\t" |
| 166 | "jne 1b" |
| 167 | : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 168 | break; |
| 169 | case 2: |
| 170 | __asm__ __volatile__ |
| 171 | ("movew %2,%0\n\t" |
| 172 | "1:\n\t" |
| 173 | "casw %0,%1,%2\n\t" |
| 174 | "jne 1b" |
| 175 | : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 176 | break; |
| 177 | case 4: |
| 178 | __asm__ __volatile__ |
| 179 | ("movel %2,%0\n\t" |
| 180 | "1:\n\t" |
| 181 | "casl %0,%1,%2\n\t" |
| 182 | "jne 1b" |
| 183 | : "=&d" (x) : "d" (x), "m" (*__xg(ptr)) : "memory"); |
| 184 | break; |
| 185 | } |
| 186 | return x; |
| 187 | } |
| 188 | #endif |
| 189 | |
| 190 | /* |
| 191 | * Atomic compare and exchange. Compare OLD with MEM, if identical, |
| 192 | * store NEW in MEM. Return the initial value in MEM. Success is |
| 193 | * indicated by comparing RETURN with OLD. |
| 194 | */ |
| 195 | #define __HAVE_ARCH_CMPXCHG 1 |
| 196 | |
| 197 | static __inline__ unsigned long |
| 198 | cmpxchg(volatile int *p, int old, int new) |
| 199 | { |
| 200 | unsigned long flags; |
| 201 | int prev; |
| 202 | |
| 203 | local_irq_save(flags); |
| 204 | if ((prev = *p) == old) |
| 205 | *p = new; |
| 206 | local_irq_restore(flags); |
| 207 | return(prev); |
| 208 | } |
| 209 | |
| 210 | |
| 211 | #ifdef CONFIG_M68332 |
| 212 | #define HARD_RESET_NOW() ({ \ |
| 213 | local_irq_disable(); \ |
| 214 | asm(" \ |
| 215 | movew #0x0000, 0xfffa6a; \ |
| 216 | reset; \ |
| 217 | /*movew #0x1557, 0xfffa44;*/ \ |
| 218 | /*movew #0x0155, 0xfffa46;*/ \ |
| 219 | moveal #0, %a0; \ |
| 220 | movec %a0, %vbr; \ |
| 221 | moveal 0, %sp; \ |
| 222 | moveal 4, %a0; \ |
| 223 | jmp (%a0); \ |
| 224 | "); \ |
| 225 | }) |
| 226 | #endif |
| 227 | |
| 228 | #if defined( CONFIG_M68328 ) || defined( CONFIG_M68EZ328 ) || \ |
| 229 | defined (CONFIG_M68360) || defined( CONFIG_M68VZ328 ) |
| 230 | #define HARD_RESET_NOW() ({ \ |
| 231 | local_irq_disable(); \ |
| 232 | asm(" \ |
| 233 | moveal #0x10c00000, %a0; \ |
| 234 | moveb #0, 0xFFFFF300; \ |
| 235 | moveal 0(%a0), %sp; \ |
| 236 | moveal 4(%a0), %a0; \ |
| 237 | jmp (%a0); \ |
| 238 | "); \ |
| 239 | }) |
| 240 | #endif |
| 241 | |
| 242 | #ifdef CONFIG_COLDFIRE |
| 243 | #if defined(CONFIG_M5272) && defined(CONFIG_NETtel) |
| 244 | /* |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 245 | * Need to account for broken early mask of 5272 silicon. So don't |
| 246 | * jump through the original start address. Jump strait into the |
| 247 | * known start of the FLASH code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | */ |
| 249 | #define HARD_RESET_NOW() ({ \ |
| 250 | asm(" \ |
| 251 | movew #0x2700, %sr; \ |
| 252 | jmp 0xf0000400; \ |
| 253 | "); \ |
| 254 | }) |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 255 | #elif defined(CONFIG_NETtel) || defined(CONFIG_eLIA) || \ |
| 256 | defined(CONFIG_DISKtel) || defined(CONFIG_SECUREEDGEMP3) || \ |
| 257 | defined(CONFIG_CLEOPATRA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | #define HARD_RESET_NOW() ({ \ |
| 259 | asm(" \ |
| 260 | movew #0x2700, %sr; \ |
| 261 | moveal #0x10000044, %a0; \ |
| 262 | movel #0xffffffff, (%a0); \ |
| 263 | moveal #0x10000001, %a0; \ |
| 264 | moveb #0x00, (%a0); \ |
| 265 | moveal #0xf0000004, %a0; \ |
| 266 | moveal (%a0), %a0; \ |
| 267 | jmp (%a0); \ |
| 268 | "); \ |
| 269 | }) |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 270 | #elif defined(CONFIG_M5272) |
| 271 | /* |
| 272 | * Retrieve the boot address in flash using CSBR0 and CSOR0 |
| 273 | * find the reset vector at flash_address + 4 (e.g. 0x400) |
| 274 | * remap it in the flash's current location (e.g. 0xf0000400) |
| 275 | * and jump there. |
| 276 | */ |
| 277 | #define HARD_RESET_NOW() ({ \ |
| 278 | asm(" \ |
| 279 | movew #0x2700, %%sr; \ |
| 280 | move.l %0+0x40,%%d0; \ |
| 281 | and.l %0+0x44,%%d0; \ |
| 282 | andi.l #0xfffff000,%%d0; \ |
| 283 | mov.l %%d0,%%a0; \ |
| 284 | or.l 4(%%a0),%%d0; \ |
| 285 | mov.l %%d0,%%a0; \ |
| 286 | jmp (%%a0);" \ |
| 287 | : /* No output */ \ |
| 288 | : "o" (*(char *)MCF_MBAR) ); \ |
| 289 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | #elif defined(CONFIG_M528x) |
| 291 | /* |
| 292 | * The MCF528x has a bit (SOFTRST) in memory (Reset Control Register RCR), |
| 293 | * that when set, resets the MCF528x. |
| 294 | */ |
| 295 | #define HARD_RESET_NOW() \ |
| 296 | ({ \ |
| 297 | unsigned char volatile *reset; \ |
| 298 | asm("move.w #0x2700, %sr"); \ |
| 299 | reset = ((volatile unsigned short *)(MCF_IPSBAR + 0x110000)); \ |
| 300 | while(1) \ |
| 301 | *reset |= (0x01 << 7);\ |
| 302 | }) |
Greg Ungerer | 9c2aba4 | 2005-09-13 11:14:08 +1000 | [diff] [blame] | 303 | #elif defined(CONFIG_M523x) |
| 304 | #define HARD_RESET_NOW() ({ \ |
| 305 | asm(" \ |
| 306 | movew #0x2700, %sr; \ |
| 307 | movel #0x01000000, %sp; \ |
| 308 | moveal #0x40110000, %a0; \ |
| 309 | moveb #0x80, (%a0); \ |
| 310 | "); \ |
| 311 | }) |
Greg Ungerer | 0182485 | 2005-11-02 15:12:42 +1000 | [diff] [blame] | 312 | #elif defined(CONFIG_M520x) |
| 313 | /* |
| 314 | * The MCF5208 has a bit (SOFTRST) in memory (Reset Control Register |
| 315 | * RCR), that when set, resets the MCF5208. |
| 316 | */ |
| 317 | #define HARD_RESET_NOW() \ |
| 318 | ({ \ |
| 319 | unsigned char volatile *reset; \ |
| 320 | asm("move.w #0x2700, %sr"); \ |
| 321 | reset = ((volatile unsigned short *)(MCF_IPSBAR + 0xA0000)); \ |
| 322 | while(1) \ |
| 323 | *reset |= 0x80; \ |
| 324 | }) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | #else |
| 326 | #define HARD_RESET_NOW() ({ \ |
| 327 | asm(" \ |
| 328 | movew #0x2700, %sr; \ |
| 329 | moveal #0x4, %a0; \ |
| 330 | moveal (%a0), %a0; \ |
| 331 | jmp (%a0); \ |
| 332 | "); \ |
| 333 | }) |
| 334 | #endif |
| 335 | #endif |
| 336 | #define arch_align_stack(x) (x) |
| 337 | |
| 338 | #endif /* _M68KNOMMU_SYSTEM_H */ |