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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _M68KNOMMU_SYSTEM_H
2#define _M68KNOMMU_SYSTEM_H
3
Linus Torvalds1da177e2005-04-16 15:20:36 -07004#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 */
34asmlinkage 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 Ungerer9c2aba42005-09-13 11:14:08 +100059 "ori.l #0x0700,%%d0\n\t" \
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 "move %%d0,%/sr\n" \
Greg Ungerer9c2aba42005-09-13 11:14:08 +100061 : /* 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 Torvalds1da177e2005-04-16 15:20:36 -070071 : \
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 Ungerer9c2aba42005-09-13 11:14:08 +100086#ifndef local_irq_save
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#define local_irq_save(x) do { local_save_flags(x); local_irq_disable(); } while (0)
Greg Ungerer9c2aba42005-09-13 11:14:08 +100088#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
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 Torvalds1da177e2005-04-16 15:20:36 -0700109
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 Torvalds1da177e2005-04-16 15:20:36 -0700123
124struct __xchg_dummy { unsigned long a[100]; };
125#define __xg(x) ((volatile struct __xchg_dummy *)(x))
126
127#ifndef CONFIG_RMW_INSNS
128static 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
158static 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
197static __inline__ unsigned long
198cmpxchg(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 Ungerer9c2aba42005-09-13 11:14:08 +1000245 * 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 Torvalds1da177e2005-04-16 15:20:36 -0700248 */
249#define HARD_RESET_NOW() ({ \
250 asm(" \
251 movew #0x2700, %sr; \
252 jmp 0xf0000400; \
253 "); \
254})
Greg Ungerer9c2aba42005-09-13 11:14:08 +1000255#elif defined(CONFIG_NETtel) || defined(CONFIG_eLIA) || \
256 defined(CONFIG_DISKtel) || defined(CONFIG_SECUREEDGEMP3) || \
257 defined(CONFIG_CLEOPATRA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258#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 Ungerer9c2aba42005-09-13 11:14:08 +1000270#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 Torvalds1da177e2005-04-16 15:20:36 -0700290#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"); \
Greg Ungerer020f9e12007-07-25 22:07:20 +1000299 reset = ((volatile unsigned char *)(MCF_IPSBAR + 0x110000)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 while(1) \
301 *reset |= (0x01 << 7);\
302})
Greg Ungerer9c2aba42005-09-13 11:14:08 +1000303#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 Ungerer01824852005-11-02 15:12:42 +1000312#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"); \
Greg Ungerer020f9e12007-07-25 22:07:20 +1000321 reset = ((volatile unsigned char *)(MCF_IPSBAR + 0xA0000)); \
Greg Ungerer01824852005-11-02 15:12:42 +1000322 while(1) \
323 *reset |= 0x80; \
324})
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325#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 */