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-rw-r--r--include/asm-sparc/system_64.h355
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diff --git a/include/asm-sparc/system_64.h b/include/asm-sparc/system_64.h
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--- a/include/asm-sparc/system_64.h
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1#ifndef __SPARC64_SYSTEM_H
2#define __SPARC64_SYSTEM_H
3
4#include <asm/ptrace.h>
5#include <asm/processor.h>
6#include <asm/visasm.h>
7
8#ifndef __ASSEMBLY__
9
10#include <linux/irqflags.h>
11#include <asm-generic/cmpxchg-local.h>
12
13/*
14 * Sparc (general) CPU types
15 */
16enum sparc_cpu {
17 sun4 = 0x00,
18 sun4c = 0x01,
19 sun4m = 0x02,
20 sun4d = 0x03,
21 sun4e = 0x04,
22 sun4u = 0x05, /* V8 ploos ploos */
23 sun_unknown = 0x06,
24 ap1000 = 0x07, /* almost a sun4m */
25};
26
27#define sparc_cpu_model sun4u
28
29/* This cannot ever be a sun4c nor sun4 :) That's just history. */
30#define ARCH_SUN4C_SUN4 0
31#define ARCH_SUN4 0
32
33extern char reboot_command[];
34
35/* These are here in an effort to more fully work around Spitfire Errata
36 * #51. Essentially, if a memory barrier occurs soon after a mispredicted
37 * branch, the chip can stop executing instructions until a trap occurs.
38 * Therefore, if interrupts are disabled, the chip can hang forever.
39 *
40 * It used to be believed that the memory barrier had to be right in the
41 * delay slot, but a case has been traced recently wherein the memory barrier
42 * was one instruction after the branch delay slot and the chip still hung.
43 * The offending sequence was the following in sym_wakeup_done() of the
44 * sym53c8xx_2 driver:
45 *
46 * call sym_ccb_from_dsa, 0
47 * movge %icc, 0, %l0
48 * brz,pn %o0, .LL1303
49 * mov %o0, %l2
50 * membar #LoadLoad
51 *
52 * The branch has to be mispredicted for the bug to occur. Therefore, we put
53 * the memory barrier explicitly into a "branch always, predicted taken"
54 * delay slot to avoid the problem case.
55 */
56#define membar_safe(type) \
57do { __asm__ __volatile__("ba,pt %%xcc, 1f\n\t" \
58 " membar " type "\n" \
59 "1:\n" \
60 : : : "memory"); \
61} while (0)
62
63#define mb() \
64 membar_safe("#LoadLoad | #LoadStore | #StoreStore | #StoreLoad")
65#define rmb() \
66 membar_safe("#LoadLoad")
67#define wmb() \
68 membar_safe("#StoreStore")
69#define membar_storeload() \
70 membar_safe("#StoreLoad")
71#define membar_storeload_storestore() \
72 membar_safe("#StoreLoad | #StoreStore")
73#define membar_storeload_loadload() \
74 membar_safe("#StoreLoad | #LoadLoad")
75#define membar_storestore_loadstore() \
76 membar_safe("#StoreStore | #LoadStore")
77
78#endif
79
80#define nop() __asm__ __volatile__ ("nop")
81
82#define read_barrier_depends() do { } while(0)
83#define set_mb(__var, __value) \
84 do { __var = __value; membar_storeload_storestore(); } while(0)
85
86#ifdef CONFIG_SMP
87#define smp_mb() mb()
88#define smp_rmb() rmb()
89#define smp_wmb() wmb()
90#define smp_read_barrier_depends() read_barrier_depends()
91#else
92#define smp_mb() __asm__ __volatile__("":::"memory")
93#define smp_rmb() __asm__ __volatile__("":::"memory")
94#define smp_wmb() __asm__ __volatile__("":::"memory")
95#define smp_read_barrier_depends() do { } while(0)
96#endif
97
98#define flushi(addr) __asm__ __volatile__ ("flush %0" : : "r" (addr) : "memory")
99
100#define flushw_all() __asm__ __volatile__("flushw")
101
102/* Performance counter register access. */
103#define read_pcr(__p) __asm__ __volatile__("rd %%pcr, %0" : "=r" (__p))
104#define write_pcr(__p) __asm__ __volatile__("wr %0, 0x0, %%pcr" : : "r" (__p))
105#define read_pic(__p) __asm__ __volatile__("rd %%pic, %0" : "=r" (__p))
106
107/* Blackbird errata workaround. See commentary in
108 * arch/sparc64/kernel/smp.c:smp_percpu_timer_interrupt()
109 * for more information.
110 */
111#define reset_pic() \
112 __asm__ __volatile__("ba,pt %xcc, 99f\n\t" \
113 ".align 64\n" \
114 "99:wr %g0, 0x0, %pic\n\t" \
115 "rd %pic, %g0")
116
117#ifndef __ASSEMBLY__
118
119extern void sun_do_break(void);
120extern int stop_a_enabled;
121
122extern void fault_in_user_windows(void);
123extern void synchronize_user_stack(void);
124
125extern void __flushw_user(void);
126#define flushw_user() __flushw_user()
127
128#define flush_user_windows flushw_user
129#define flush_register_windows flushw_all
130
131/* Don't hold the runqueue lock over context switch */
132#define __ARCH_WANT_UNLOCKED_CTXSW
133#define prepare_arch_switch(next) \
134do { \
135 flushw_all(); \
136} while (0)
137
138 /* See what happens when you design the chip correctly?
139 *
140 * We tell gcc we clobber all non-fixed-usage registers except
141 * for l0/l1. It will use one for 'next' and the other to hold
142 * the output value of 'last'. 'next' is not referenced again
143 * past the invocation of switch_to in the scheduler, so we need
144 * not preserve it's value. Hairy, but it lets us remove 2 loads
145 * and 2 stores in this critical code path. -DaveM
146 */
147#define switch_to(prev, next, last) \
148do { if (test_thread_flag(TIF_PERFCTR)) { \
149 unsigned long __tmp; \
150 read_pcr(__tmp); \
151 current_thread_info()->pcr_reg = __tmp; \
152 read_pic(__tmp); \
153 current_thread_info()->kernel_cntd0 += (unsigned int)(__tmp);\
154 current_thread_info()->kernel_cntd1 += ((__tmp) >> 32); \
155 } \
156 flush_tlb_pending(); \
157 save_and_clear_fpu(); \
158 /* If you are tempted to conditionalize the following */ \
159 /* so that ASI is only written if it changes, think again. */ \
160 __asm__ __volatile__("wr %%g0, %0, %%asi" \
161 : : "r" (__thread_flag_byte_ptr(task_thread_info(next))[TI_FLAG_BYTE_CURRENT_DS]));\
162 trap_block[current_thread_info()->cpu].thread = \
163 task_thread_info(next); \
164 __asm__ __volatile__( \
165 "mov %%g4, %%g7\n\t" \
166 "stx %%i6, [%%sp + 2047 + 0x70]\n\t" \
167 "stx %%i7, [%%sp + 2047 + 0x78]\n\t" \
168 "rdpr %%wstate, %%o5\n\t" \
169 "stx %%o6, [%%g6 + %6]\n\t" \
170 "stb %%o5, [%%g6 + %5]\n\t" \
171 "rdpr %%cwp, %%o5\n\t" \
172 "stb %%o5, [%%g6 + %8]\n\t" \
173 "mov %4, %%g6\n\t" \
174 "ldub [%4 + %8], %%g1\n\t" \
175 "wrpr %%g1, %%cwp\n\t" \
176 "ldx [%%g6 + %6], %%o6\n\t" \
177 "ldub [%%g6 + %5], %%o5\n\t" \
178 "ldub [%%g6 + %7], %%o7\n\t" \
179 "wrpr %%o5, 0x0, %%wstate\n\t" \
180 "ldx [%%sp + 2047 + 0x70], %%i6\n\t" \
181 "ldx [%%sp + 2047 + 0x78], %%i7\n\t" \
182 "ldx [%%g6 + %9], %%g4\n\t" \
183 "brz,pt %%o7, switch_to_pc\n\t" \
184 " mov %%g7, %0\n\t" \
185 "sethi %%hi(ret_from_syscall), %%g1\n\t" \
186 "jmpl %%g1 + %%lo(ret_from_syscall), %%g0\n\t" \
187 " nop\n\t" \
188 ".globl switch_to_pc\n\t" \
189 "switch_to_pc:\n\t" \
190 : "=&r" (last), "=r" (current), "=r" (current_thread_info_reg), \
191 "=r" (__local_per_cpu_offset) \
192 : "0" (task_thread_info(next)), \
193 "i" (TI_WSTATE), "i" (TI_KSP), "i" (TI_NEW_CHILD), \
194 "i" (TI_CWP), "i" (TI_TASK) \
195 : "cc", \
196 "g1", "g2", "g3", "g7", \
197 "l1", "l2", "l3", "l4", "l5", "l6", "l7", \
198 "i0", "i1", "i2", "i3", "i4", "i5", \
199 "o0", "o1", "o2", "o3", "o4", "o5", "o7"); \
200 /* If you fuck with this, update ret_from_syscall code too. */ \
201 if (test_thread_flag(TIF_PERFCTR)) { \
202 write_pcr(current_thread_info()->pcr_reg); \
203 reset_pic(); \
204 } \
205} while(0)
206
207static inline unsigned long xchg32(__volatile__ unsigned int *m, unsigned int val)
208{
209 unsigned long tmp1, tmp2;
210
211 __asm__ __volatile__(
212" membar #StoreLoad | #LoadLoad\n"
213" mov %0, %1\n"
214"1: lduw [%4], %2\n"
215" cas [%4], %2, %0\n"
216" cmp %2, %0\n"
217" bne,a,pn %%icc, 1b\n"
218" mov %1, %0\n"
219" membar #StoreLoad | #StoreStore\n"
220 : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
221 : "0" (val), "r" (m)
222 : "cc", "memory");
223 return val;
224}
225
226static inline unsigned long xchg64(__volatile__ unsigned long *m, unsigned long val)
227{
228 unsigned long tmp1, tmp2;
229
230 __asm__ __volatile__(
231" membar #StoreLoad | #LoadLoad\n"
232" mov %0, %1\n"
233"1: ldx [%4], %2\n"
234" casx [%4], %2, %0\n"
235" cmp %2, %0\n"
236" bne,a,pn %%xcc, 1b\n"
237" mov %1, %0\n"
238" membar #StoreLoad | #StoreStore\n"
239 : "=&r" (val), "=&r" (tmp1), "=&r" (tmp2)
240 : "0" (val), "r" (m)
241 : "cc", "memory");
242 return val;
243}
244
245#define xchg(ptr,x) ((__typeof__(*(ptr)))__xchg((unsigned long)(x),(ptr),sizeof(*(ptr))))
246
247extern void __xchg_called_with_bad_pointer(void);
248
249static inline unsigned long __xchg(unsigned long x, __volatile__ void * ptr,
250 int size)
251{
252 switch (size) {
253 case 4:
254 return xchg32(ptr, x);
255 case 8:
256 return xchg64(ptr, x);
257 };
258 __xchg_called_with_bad_pointer();
259 return x;
260}
261
262extern void die_if_kernel(char *str, struct pt_regs *regs) __attribute__ ((noreturn));
263
264/*
265 * Atomic compare and exchange. Compare OLD with MEM, if identical,
266 * store NEW in MEM. Return the initial value in MEM. Success is
267 * indicated by comparing RETURN with OLD.
268 */
269
270#define __HAVE_ARCH_CMPXCHG 1
271
272static inline unsigned long
273__cmpxchg_u32(volatile int *m, int old, int new)
274{
275 __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
276 "cas [%2], %3, %0\n\t"
277 "membar #StoreLoad | #StoreStore"
278 : "=&r" (new)
279 : "0" (new), "r" (m), "r" (old)
280 : "memory");
281
282 return new;
283}
284
285static inline unsigned long
286__cmpxchg_u64(volatile long *m, unsigned long old, unsigned long new)
287{
288 __asm__ __volatile__("membar #StoreLoad | #LoadLoad\n"
289 "casx [%2], %3, %0\n\t"
290 "membar #StoreLoad | #StoreStore"
291 : "=&r" (new)
292 : "0" (new), "r" (m), "r" (old)
293 : "memory");
294
295 return new;
296}
297
298/* This function doesn't exist, so you'll get a linker error
299 if something tries to do an invalid cmpxchg(). */
300extern void __cmpxchg_called_with_bad_pointer(void);
301
302static inline unsigned long
303__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
304{
305 switch (size) {
306 case 4:
307 return __cmpxchg_u32(ptr, old, new);
308 case 8:
309 return __cmpxchg_u64(ptr, old, new);
310 }
311 __cmpxchg_called_with_bad_pointer();
312 return old;
313}
314
315#define cmpxchg(ptr,o,n) \
316 ({ \
317 __typeof__(*(ptr)) _o_ = (o); \
318 __typeof__(*(ptr)) _n_ = (n); \
319 (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
320 (unsigned long)_n_, sizeof(*(ptr))); \
321 })
322
323/*
324 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
325 * them available.
326 */
327
328static inline unsigned long __cmpxchg_local(volatile void *ptr,
329 unsigned long old,
330 unsigned long new, int size)
331{
332 switch (size) {
333 case 4:
334 case 8: return __cmpxchg(ptr, old, new, size);
335 default:
336 return __cmpxchg_local_generic(ptr, old, new, size);
337 }
338
339 return old;
340}
341
342#define cmpxchg_local(ptr, o, n) \
343 ((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
344 (unsigned long)(n), sizeof(*(ptr))))
345#define cmpxchg64_local(ptr, o, n) \
346 ({ \
347 BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
348 cmpxchg_local((ptr), (o), (n)); \
349 })
350
351#endif /* !(__ASSEMBLY__) */
352
353#define arch_align_stack(x) (x)
354
355#endif /* !(__SPARC64_SYSTEM_H) */
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