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authorGerd Hoffmann <kraxel@suse.de>2006-06-26 07:56:16 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 13:48:14 -0400
commitd167a51877e94dda73dd656c51f363502309f713 (patch)
treeeb02c2974b61777f575dfdc07d4c2adf83bde434 /include/asm-x86_64
parent240cd6a80642da528bfa382ec2ae4e3cb8991ea7 (diff)
[PATCH] x86_64: x86_64 version of the smp alternative patch.
Changes are largely identical to the i386 version: * alternative #define are moved to the new alternative.h file. * one new elf section with pointers to the lock prefixes which can be nop'ed out for non-smp. * two new elf sections simliar to the "classic" alternatives to replace SMP code with simpler UP code. * fixup headers to use alternative.h instead of defining their own LOCK / LOCK_PREFIX macros. The patch reuses the i386 version of the alternatives code to avoid code duplication. The code in alternatives.c was shuffled around a bit to reduce the number of #ifdefs needed. It also got some tweaks needed for x86_64 (vsyscall page handling) and new features (noreplacement option which was x86_64 only up to now). Debug printk's are changed from compile-time to runtime. Loosely based on a early version from Bastian Blank <waldi@debian.org> Signed-off-by: Gerd Hoffmann <kraxel@suse.de> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r--include/asm-x86_64/alternative.h146
-rw-r--r--include/asm-x86_64/atomic.h42
-rw-r--r--include/asm-x86_64/bitops.h7
-rw-r--r--include/asm-x86_64/cpufeature.h2
-rw-r--r--include/asm-x86_64/mutex.h4
-rw-r--r--include/asm-x86_64/rwlock.h8
-rw-r--r--include/asm-x86_64/semaphore.h8
-rw-r--r--include/asm-x86_64/spinlock.h10
-rw-r--r--include/asm-x86_64/system.h86
9 files changed, 190 insertions, 123 deletions
diff --git a/include/asm-x86_64/alternative.h b/include/asm-x86_64/alternative.h
new file mode 100644
index 000000000000..387c8f66af7d
--- /dev/null
+++ b/include/asm-x86_64/alternative.h
@@ -0,0 +1,146 @@
1#ifndef _X86_64_ALTERNATIVE_H
2#define _X86_64_ALTERNATIVE_H
3
4#ifdef __KERNEL__
5
6#include <linux/types.h>
7
8struct alt_instr {
9 u8 *instr; /* original instruction */
10 u8 *replacement;
11 u8 cpuid; /* cpuid bit set for replacement */
12 u8 instrlen; /* length of original instruction */
13 u8 replacementlen; /* length of new instruction, <= instrlen */
14 u8 pad[5];
15};
16
17extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
18
19struct module;
20extern void alternatives_smp_module_add(struct module *mod, char *name,
21 void *locks, void *locks_end,
22 void *text, void *text_end);
23extern void alternatives_smp_module_del(struct module *mod);
24extern void alternatives_smp_switch(int smp);
25
26#endif
27
28/*
29 * Alternative instructions for different CPU types or capabilities.
30 *
31 * This allows to use optimized instructions even on generic binary
32 * kernels.
33 *
34 * length of oldinstr must be longer or equal the length of newinstr
35 * It can be padded with nops as needed.
36 *
37 * For non barrier like inlines please define new variants
38 * without volatile and memory clobber.
39 */
40#define alternative(oldinstr, newinstr, feature) \
41 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
42 ".section .altinstructions,\"a\"\n" \
43 " .align 8\n" \
44 " .quad 661b\n" /* label */ \
45 " .quad 663f\n" /* new instruction */ \
46 " .byte %c0\n" /* feature bit */ \
47 " .byte 662b-661b\n" /* sourcelen */ \
48 " .byte 664f-663f\n" /* replacementlen */ \
49 ".previous\n" \
50 ".section .altinstr_replacement,\"ax\"\n" \
51 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
52 ".previous" :: "i" (feature) : "memory")
53
54/*
55 * Alternative inline assembly with input.
56 *
57 * Pecularities:
58 * No memory clobber here.
59 * Argument numbers start with 1.
60 * Best is to use constraints that are fixed size (like (%1) ... "r")
61 * If you use variable sized constraints like "m" or "g" in the
62 * replacement make sure to pad to the worst case length.
63 */
64#define alternative_input(oldinstr, newinstr, feature, input...) \
65 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
66 ".section .altinstructions,\"a\"\n" \
67 " .align 8\n" \
68 " .quad 661b\n" /* label */ \
69 " .quad 663f\n" /* new instruction */ \
70 " .byte %c0\n" /* feature bit */ \
71 " .byte 662b-661b\n" /* sourcelen */ \
72 " .byte 664f-663f\n" /* replacementlen */ \
73 ".previous\n" \
74 ".section .altinstr_replacement,\"ax\"\n" \
75 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
76 ".previous" :: "i" (feature), ##input)
77
78/* Like alternative_input, but with a single output argument */
79#define alternative_io(oldinstr, newinstr, feature, output, input...) \
80 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
81 ".section .altinstructions,\"a\"\n" \
82 " .align 8\n" \
83 " .quad 661b\n" /* label */ \
84 " .quad 663f\n" /* new instruction */ \
85 " .byte %c[feat]\n" /* feature bit */ \
86 " .byte 662b-661b\n" /* sourcelen */ \
87 " .byte 664f-663f\n" /* replacementlen */ \
88 ".previous\n" \
89 ".section .altinstr_replacement,\"ax\"\n" \
90 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
91 ".previous" : output : [feat] "i" (feature), ##input)
92
93/*
94 * Alternative inline assembly for SMP.
95 *
96 * alternative_smp() takes two versions (SMP first, UP second) and is
97 * for more complex stuff such as spinlocks.
98 *
99 * The LOCK_PREFIX macro defined here replaces the LOCK and
100 * LOCK_PREFIX macros used everywhere in the source tree.
101 *
102 * SMP alternatives use the same data structures as the other
103 * alternatives and the X86_FEATURE_UP flag to indicate the case of a
104 * UP system running a SMP kernel. The existing apply_alternatives()
105 * works fine for patching a SMP kernel for UP.
106 *
107 * The SMP alternative tables can be kept after boot and contain both
108 * UP and SMP versions of the instructions to allow switching back to
109 * SMP at runtime, when hotplugging in a new CPU, which is especially
110 * useful in virtualized environments.
111 *
112 * The very common lock prefix is handled as special case in a
113 * separate table which is a pure address list without replacement ptr
114 * and size information. That keeps the table sizes small.
115 */
116
117#ifdef CONFIG_SMP
118#define alternative_smp(smpinstr, upinstr, args...) \
119 asm volatile ("661:\n\t" smpinstr "\n662:\n" \
120 ".section .smp_altinstructions,\"a\"\n" \
121 " .align 8\n" \
122 " .quad 661b\n" /* label */ \
123 " .quad 663f\n" /* new instruction */ \
124 " .byte 0x66\n" /* X86_FEATURE_UP */ \
125 " .byte 662b-661b\n" /* sourcelen */ \
126 " .byte 664f-663f\n" /* replacementlen */ \
127 ".previous\n" \
128 ".section .smp_altinstr_replacement,\"awx\"\n" \
129 "663:\n\t" upinstr "\n" /* replacement */ \
130 "664:\n\t.fill 662b-661b,1,0x42\n" /* space for original */ \
131 ".previous" : args)
132
133#define LOCK_PREFIX \
134 ".section .smp_locks,\"a\"\n" \
135 " .align 8\n" \
136 " .quad 661f\n" /* address */ \
137 ".previous\n" \
138 "661:\n\tlock; "
139
140#else /* ! CONFIG_SMP */
141#define alternative_smp(smpinstr, upinstr, args...) \
142 asm volatile (upinstr : args)
143#define LOCK_PREFIX ""
144#endif
145
146#endif /* _X86_64_ALTERNATIVE_H */
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index bd3fa67ed835..007e88d6d43f 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -1,7 +1,7 @@
1#ifndef __ARCH_X86_64_ATOMIC__ 1#ifndef __ARCH_X86_64_ATOMIC__
2#define __ARCH_X86_64_ATOMIC__ 2#define __ARCH_X86_64_ATOMIC__
3 3
4#include <asm/types.h> 4#include <asm/alternative.h>
5 5
6/* atomic_t should be 32 bit signed type */ 6/* atomic_t should be 32 bit signed type */
7 7
@@ -52,7 +52,7 @@ typedef struct { volatile int counter; } atomic_t;
52static __inline__ void atomic_add(int i, atomic_t *v) 52static __inline__ void atomic_add(int i, atomic_t *v)
53{ 53{
54 __asm__ __volatile__( 54 __asm__ __volatile__(
55 LOCK "addl %1,%0" 55 LOCK_PREFIX "addl %1,%0"
56 :"=m" (v->counter) 56 :"=m" (v->counter)
57 :"ir" (i), "m" (v->counter)); 57 :"ir" (i), "m" (v->counter));
58} 58}
@@ -67,7 +67,7 @@ static __inline__ void atomic_add(int i, atomic_t *v)
67static __inline__ void atomic_sub(int i, atomic_t *v) 67static __inline__ void atomic_sub(int i, atomic_t *v)
68{ 68{
69 __asm__ __volatile__( 69 __asm__ __volatile__(
70 LOCK "subl %1,%0" 70 LOCK_PREFIX "subl %1,%0"
71 :"=m" (v->counter) 71 :"=m" (v->counter)
72 :"ir" (i), "m" (v->counter)); 72 :"ir" (i), "m" (v->counter));
73} 73}
@@ -86,7 +86,7 @@ static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
86 unsigned char c; 86 unsigned char c;
87 87
88 __asm__ __volatile__( 88 __asm__ __volatile__(
89 LOCK "subl %2,%0; sete %1" 89 LOCK_PREFIX "subl %2,%0; sete %1"
90 :"=m" (v->counter), "=qm" (c) 90 :"=m" (v->counter), "=qm" (c)
91 :"ir" (i), "m" (v->counter) : "memory"); 91 :"ir" (i), "m" (v->counter) : "memory");
92 return c; 92 return c;
@@ -101,7 +101,7 @@ static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
101static __inline__ void atomic_inc(atomic_t *v) 101static __inline__ void atomic_inc(atomic_t *v)
102{ 102{
103 __asm__ __volatile__( 103 __asm__ __volatile__(
104 LOCK "incl %0" 104 LOCK_PREFIX "incl %0"
105 :"=m" (v->counter) 105 :"=m" (v->counter)
106 :"m" (v->counter)); 106 :"m" (v->counter));
107} 107}
@@ -115,7 +115,7 @@ static __inline__ void atomic_inc(atomic_t *v)
115static __inline__ void atomic_dec(atomic_t *v) 115static __inline__ void atomic_dec(atomic_t *v)
116{ 116{
117 __asm__ __volatile__( 117 __asm__ __volatile__(
118 LOCK "decl %0" 118 LOCK_PREFIX "decl %0"
119 :"=m" (v->counter) 119 :"=m" (v->counter)
120 :"m" (v->counter)); 120 :"m" (v->counter));
121} 121}
@@ -133,7 +133,7 @@ static __inline__ int atomic_dec_and_test(atomic_t *v)
133 unsigned char c; 133 unsigned char c;
134 134
135 __asm__ __volatile__( 135 __asm__ __volatile__(
136 LOCK "decl %0; sete %1" 136 LOCK_PREFIX "decl %0; sete %1"
137 :"=m" (v->counter), "=qm" (c) 137 :"=m" (v->counter), "=qm" (c)
138 :"m" (v->counter) : "memory"); 138 :"m" (v->counter) : "memory");
139 return c != 0; 139 return c != 0;
@@ -152,7 +152,7 @@ static __inline__ int atomic_inc_and_test(atomic_t *v)
152 unsigned char c; 152 unsigned char c;
153 153
154 __asm__ __volatile__( 154 __asm__ __volatile__(
155 LOCK "incl %0; sete %1" 155 LOCK_PREFIX "incl %0; sete %1"
156 :"=m" (v->counter), "=qm" (c) 156 :"=m" (v->counter), "=qm" (c)
157 :"m" (v->counter) : "memory"); 157 :"m" (v->counter) : "memory");
158 return c != 0; 158 return c != 0;
@@ -172,7 +172,7 @@ static __inline__ int atomic_add_negative(int i, atomic_t *v)
172 unsigned char c; 172 unsigned char c;
173 173
174 __asm__ __volatile__( 174 __asm__ __volatile__(
175 LOCK "addl %2,%0; sets %1" 175 LOCK_PREFIX "addl %2,%0; sets %1"
176 :"=m" (v->counter), "=qm" (c) 176 :"=m" (v->counter), "=qm" (c)
177 :"ir" (i), "m" (v->counter) : "memory"); 177 :"ir" (i), "m" (v->counter) : "memory");
178 return c; 178 return c;
@@ -189,7 +189,7 @@ static __inline__ int atomic_add_return(int i, atomic_t *v)
189{ 189{
190 int __i = i; 190 int __i = i;
191 __asm__ __volatile__( 191 __asm__ __volatile__(
192 LOCK "xaddl %0, %1;" 192 LOCK_PREFIX "xaddl %0, %1;"
193 :"=r"(i) 193 :"=r"(i)
194 :"m"(v->counter), "0"(i)); 194 :"m"(v->counter), "0"(i));
195 return i + __i; 195 return i + __i;
@@ -237,7 +237,7 @@ typedef struct { volatile long counter; } atomic64_t;
237static __inline__ void atomic64_add(long i, atomic64_t *v) 237static __inline__ void atomic64_add(long i, atomic64_t *v)
238{ 238{
239 __asm__ __volatile__( 239 __asm__ __volatile__(
240 LOCK "addq %1,%0" 240 LOCK_PREFIX "addq %1,%0"
241 :"=m" (v->counter) 241 :"=m" (v->counter)
242 :"ir" (i), "m" (v->counter)); 242 :"ir" (i), "m" (v->counter));
243} 243}
@@ -252,7 +252,7 @@ static __inline__ void atomic64_add(long i, atomic64_t *v)
252static __inline__ void atomic64_sub(long i, atomic64_t *v) 252static __inline__ void atomic64_sub(long i, atomic64_t *v)
253{ 253{
254 __asm__ __volatile__( 254 __asm__ __volatile__(
255 LOCK "subq %1,%0" 255 LOCK_PREFIX "subq %1,%0"
256 :"=m" (v->counter) 256 :"=m" (v->counter)
257 :"ir" (i), "m" (v->counter)); 257 :"ir" (i), "m" (v->counter));
258} 258}
@@ -271,7 +271,7 @@ static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v)
271 unsigned char c; 271 unsigned char c;
272 272
273 __asm__ __volatile__( 273 __asm__ __volatile__(
274 LOCK "subq %2,%0; sete %1" 274 LOCK_PREFIX "subq %2,%0; sete %1"
275 :"=m" (v->counter), "=qm" (c) 275 :"=m" (v->counter), "=qm" (c)
276 :"ir" (i), "m" (v->counter) : "memory"); 276 :"ir" (i), "m" (v->counter) : "memory");
277 return c; 277 return c;
@@ -286,7 +286,7 @@ static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v)
286static __inline__ void atomic64_inc(atomic64_t *v) 286static __inline__ void atomic64_inc(atomic64_t *v)
287{ 287{
288 __asm__ __volatile__( 288 __asm__ __volatile__(
289 LOCK "incq %0" 289 LOCK_PREFIX "incq %0"
290 :"=m" (v->counter) 290 :"=m" (v->counter)
291 :"m" (v->counter)); 291 :"m" (v->counter));
292} 292}
@@ -300,7 +300,7 @@ static __inline__ void atomic64_inc(atomic64_t *v)
300static __inline__ void atomic64_dec(atomic64_t *v) 300static __inline__ void atomic64_dec(atomic64_t *v)
301{ 301{
302 __asm__ __volatile__( 302 __asm__ __volatile__(
303 LOCK "decq %0" 303 LOCK_PREFIX "decq %0"
304 :"=m" (v->counter) 304 :"=m" (v->counter)
305 :"m" (v->counter)); 305 :"m" (v->counter));
306} 306}
@@ -318,7 +318,7 @@ static __inline__ int atomic64_dec_and_test(atomic64_t *v)
318 unsigned char c; 318 unsigned char c;
319 319
320 __asm__ __volatile__( 320 __asm__ __volatile__(
321 LOCK "decq %0; sete %1" 321 LOCK_PREFIX "decq %0; sete %1"
322 :"=m" (v->counter), "=qm" (c) 322 :"=m" (v->counter), "=qm" (c)
323 :"m" (v->counter) : "memory"); 323 :"m" (v->counter) : "memory");
324 return c != 0; 324 return c != 0;
@@ -337,7 +337,7 @@ static __inline__ int atomic64_inc_and_test(atomic64_t *v)
337 unsigned char c; 337 unsigned char c;
338 338
339 __asm__ __volatile__( 339 __asm__ __volatile__(
340 LOCK "incq %0; sete %1" 340 LOCK_PREFIX "incq %0; sete %1"
341 :"=m" (v->counter), "=qm" (c) 341 :"=m" (v->counter), "=qm" (c)
342 :"m" (v->counter) : "memory"); 342 :"m" (v->counter) : "memory");
343 return c != 0; 343 return c != 0;
@@ -357,7 +357,7 @@ static __inline__ int atomic64_add_negative(long i, atomic64_t *v)
357 unsigned char c; 357 unsigned char c;
358 358
359 __asm__ __volatile__( 359 __asm__ __volatile__(
360 LOCK "addq %2,%0; sets %1" 360 LOCK_PREFIX "addq %2,%0; sets %1"
361 :"=m" (v->counter), "=qm" (c) 361 :"=m" (v->counter), "=qm" (c)
362 :"ir" (i), "m" (v->counter) : "memory"); 362 :"ir" (i), "m" (v->counter) : "memory");
363 return c; 363 return c;
@@ -374,7 +374,7 @@ static __inline__ long atomic64_add_return(long i, atomic64_t *v)
374{ 374{
375 long __i = i; 375 long __i = i;
376 __asm__ __volatile__( 376 __asm__ __volatile__(
377 LOCK "xaddq %0, %1;" 377 LOCK_PREFIX "xaddq %0, %1;"
378 :"=r"(i) 378 :"=r"(i)
379 :"m"(v->counter), "0"(i)); 379 :"m"(v->counter), "0"(i));
380 return i + __i; 380 return i + __i;
@@ -418,11 +418,11 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
418 418
419/* These are x86-specific, used by some header files */ 419/* These are x86-specific, used by some header files */
420#define atomic_clear_mask(mask, addr) \ 420#define atomic_clear_mask(mask, addr) \
421__asm__ __volatile__(LOCK "andl %0,%1" \ 421__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
422: : "r" (~(mask)),"m" (*addr) : "memory") 422: : "r" (~(mask)),"m" (*addr) : "memory")
423 423
424#define atomic_set_mask(mask, addr) \ 424#define atomic_set_mask(mask, addr) \
425__asm__ __volatile__(LOCK "orl %0,%1" \ 425__asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
426: : "r" ((unsigned)mask),"m" (*(addr)) : "memory") 426: : "r" ((unsigned)mask),"m" (*(addr)) : "memory")
427 427
428/* Atomic operations are already serializing on x86 */ 428/* Atomic operations are already serializing on x86 */
diff --git a/include/asm-x86_64/bitops.h b/include/asm-x86_64/bitops.h
index e9bf933d25d0..f7ba57b1cc08 100644
--- a/include/asm-x86_64/bitops.h
+++ b/include/asm-x86_64/bitops.h
@@ -5,12 +5,7 @@
5 * Copyright 1992, Linus Torvalds. 5 * Copyright 1992, Linus Torvalds.
6 */ 6 */
7 7
8 8#include <asm/alternative.h>
9#ifdef CONFIG_SMP
10#define LOCK_PREFIX "lock ; "
11#else
12#define LOCK_PREFIX ""
13#endif
14 9
15#define ADDR (*(volatile long *) addr) 10#define ADDR (*(volatile long *) addr)
16 11
diff --git a/include/asm-x86_64/cpufeature.h b/include/asm-x86_64/cpufeature.h
index 662964b74e34..afc44e557400 100644
--- a/include/asm-x86_64/cpufeature.h
+++ b/include/asm-x86_64/cpufeature.h
@@ -65,6 +65,8 @@
65#define X86_FEATURE_CONSTANT_TSC (3*32+5) /* TSC runs at constant rate */ 65#define X86_FEATURE_CONSTANT_TSC (3*32+5) /* TSC runs at constant rate */
66#define X86_FEATURE_SYNC_RDTSC (3*32+6) /* RDTSC syncs CPU core */ 66#define X86_FEATURE_SYNC_RDTSC (3*32+6) /* RDTSC syncs CPU core */
67#define X86_FEATURE_FXSAVE_LEAK (3*32+7) /* FIP/FOP/FDP leaks through FXSAVE */ 67#define X86_FEATURE_FXSAVE_LEAK (3*32+7) /* FIP/FOP/FDP leaks through FXSAVE */
68#define X86_FEATURE_UP (3*32+8) /* SMP kernel running on UP */
69
68 70
69/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */ 71/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
70#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */ 72#define X86_FEATURE_XMM3 (4*32+ 0) /* Streaming SIMD Extensions-3 */
diff --git a/include/asm-x86_64/mutex.h b/include/asm-x86_64/mutex.h
index 11fbee2bd6c0..06fab6de2a88 100644
--- a/include/asm-x86_64/mutex.h
+++ b/include/asm-x86_64/mutex.h
@@ -24,7 +24,7 @@ do { \
24 typecheck_fn(fastcall void (*)(atomic_t *), fail_fn); \ 24 typecheck_fn(fastcall void (*)(atomic_t *), fail_fn); \
25 \ 25 \
26 __asm__ __volatile__( \ 26 __asm__ __volatile__( \
27 LOCK " decl (%%rdi) \n" \ 27 LOCK_PREFIX " decl (%%rdi) \n" \
28 " js 2f \n" \ 28 " js 2f \n" \
29 "1: \n" \ 29 "1: \n" \
30 \ 30 \
@@ -74,7 +74,7 @@ do { \
74 typecheck_fn(fastcall void (*)(atomic_t *), fail_fn); \ 74 typecheck_fn(fastcall void (*)(atomic_t *), fail_fn); \
75 \ 75 \
76 __asm__ __volatile__( \ 76 __asm__ __volatile__( \
77 LOCK " incl (%%rdi) \n" \ 77 LOCK_PREFIX " incl (%%rdi) \n" \
78 " jle 2f \n" \ 78 " jle 2f \n" \
79 "1: \n" \ 79 "1: \n" \
80 \ 80 \
diff --git a/include/asm-x86_64/rwlock.h b/include/asm-x86_64/rwlock.h
index 9942cc393064..dea0e9459264 100644
--- a/include/asm-x86_64/rwlock.h
+++ b/include/asm-x86_64/rwlock.h
@@ -24,7 +24,7 @@
24#define RW_LOCK_BIAS_STR "0x01000000" 24#define RW_LOCK_BIAS_STR "0x01000000"
25 25
26#define __build_read_lock_ptr(rw, helper) \ 26#define __build_read_lock_ptr(rw, helper) \
27 asm volatile(LOCK "subl $1,(%0)\n\t" \ 27 asm volatile(LOCK_PREFIX "subl $1,(%0)\n\t" \
28 "js 2f\n" \ 28 "js 2f\n" \
29 "1:\n" \ 29 "1:\n" \
30 LOCK_SECTION_START("") \ 30 LOCK_SECTION_START("") \
@@ -34,7 +34,7 @@
34 ::"a" (rw) : "memory") 34 ::"a" (rw) : "memory")
35 35
36#define __build_read_lock_const(rw, helper) \ 36#define __build_read_lock_const(rw, helper) \
37 asm volatile(LOCK "subl $1,%0\n\t" \ 37 asm volatile(LOCK_PREFIX "subl $1,%0\n\t" \
38 "js 2f\n" \ 38 "js 2f\n" \
39 "1:\n" \ 39 "1:\n" \
40 LOCK_SECTION_START("") \ 40 LOCK_SECTION_START("") \
@@ -54,7 +54,7 @@
54 } while (0) 54 } while (0)
55 55
56#define __build_write_lock_ptr(rw, helper) \ 56#define __build_write_lock_ptr(rw, helper) \
57 asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \ 57 asm volatile(LOCK_PREFIX "subl $" RW_LOCK_BIAS_STR ",(%0)\n\t" \
58 "jnz 2f\n" \ 58 "jnz 2f\n" \
59 "1:\n" \ 59 "1:\n" \
60 LOCK_SECTION_START("") \ 60 LOCK_SECTION_START("") \
@@ -64,7 +64,7 @@
64 ::"a" (rw) : "memory") 64 ::"a" (rw) : "memory")
65 65
66#define __build_write_lock_const(rw, helper) \ 66#define __build_write_lock_const(rw, helper) \
67 asm volatile(LOCK "subl $" RW_LOCK_BIAS_STR ",%0\n\t" \ 67 asm volatile(LOCK_PREFIX "subl $" RW_LOCK_BIAS_STR ",%0\n\t" \
68 "jnz 2f\n" \ 68 "jnz 2f\n" \
69 "1:\n" \ 69 "1:\n" \
70 LOCK_SECTION_START("") \ 70 LOCK_SECTION_START("") \
diff --git a/include/asm-x86_64/semaphore.h b/include/asm-x86_64/semaphore.h
index a389aa6fe80f..064df08b9a0f 100644
--- a/include/asm-x86_64/semaphore.h
+++ b/include/asm-x86_64/semaphore.h
@@ -106,7 +106,7 @@ static inline void down(struct semaphore * sem)
106 106
107 __asm__ __volatile__( 107 __asm__ __volatile__(
108 "# atomic down operation\n\t" 108 "# atomic down operation\n\t"
109 LOCK "decl %0\n\t" /* --sem->count */ 109 LOCK_PREFIX "decl %0\n\t" /* --sem->count */
110 "js 2f\n" 110 "js 2f\n"
111 "1:\n" 111 "1:\n"
112 LOCK_SECTION_START("") 112 LOCK_SECTION_START("")
@@ -130,7 +130,7 @@ static inline int down_interruptible(struct semaphore * sem)
130 130
131 __asm__ __volatile__( 131 __asm__ __volatile__(
132 "# atomic interruptible down operation\n\t" 132 "# atomic interruptible down operation\n\t"
133 LOCK "decl %1\n\t" /* --sem->count */ 133 LOCK_PREFIX "decl %1\n\t" /* --sem->count */
134 "js 2f\n\t" 134 "js 2f\n\t"
135 "xorl %0,%0\n" 135 "xorl %0,%0\n"
136 "1:\n" 136 "1:\n"
@@ -154,7 +154,7 @@ static inline int down_trylock(struct semaphore * sem)
154 154
155 __asm__ __volatile__( 155 __asm__ __volatile__(
156 "# atomic interruptible down operation\n\t" 156 "# atomic interruptible down operation\n\t"
157 LOCK "decl %1\n\t" /* --sem->count */ 157 LOCK_PREFIX "decl %1\n\t" /* --sem->count */
158 "js 2f\n\t" 158 "js 2f\n\t"
159 "xorl %0,%0\n" 159 "xorl %0,%0\n"
160 "1:\n" 160 "1:\n"
@@ -178,7 +178,7 @@ static inline void up(struct semaphore * sem)
178{ 178{
179 __asm__ __volatile__( 179 __asm__ __volatile__(
180 "# atomic up operation\n\t" 180 "# atomic up operation\n\t"
181 LOCK "incl %0\n\t" /* ++sem->count */ 181 LOCK_PREFIX "incl %0\n\t" /* ++sem->count */
182 "jle 2f\n" 182 "jle 2f\n"
183 "1:\n" 183 "1:\n"
184 LOCK_SECTION_START("") 184 LOCK_SECTION_START("")
diff --git a/include/asm-x86_64/spinlock.h b/include/asm-x86_64/spinlock.h
index 5d8a5e3589ff..8d3421996f94 100644
--- a/include/asm-x86_64/spinlock.h
+++ b/include/asm-x86_64/spinlock.h
@@ -31,15 +31,19 @@
31 "jmp 1b\n" \ 31 "jmp 1b\n" \
32 LOCK_SECTION_END 32 LOCK_SECTION_END
33 33
34#define __raw_spin_lock_string_up \
35 "\n\tdecl %0"
36
34#define __raw_spin_unlock_string \ 37#define __raw_spin_unlock_string \
35 "movl $1,%0" \ 38 "movl $1,%0" \
36 :"=m" (lock->slock) : : "memory" 39 :"=m" (lock->slock) : : "memory"
37 40
38static inline void __raw_spin_lock(raw_spinlock_t *lock) 41static inline void __raw_spin_lock(raw_spinlock_t *lock)
39{ 42{
40 __asm__ __volatile__( 43 alternative_smp(
41 __raw_spin_lock_string 44 __raw_spin_lock_string,
42 :"=m" (lock->slock) : : "memory"); 45 __raw_spin_lock_string_up,
46 "=m" (lock->slock) : : "memory");
43} 47}
44 48
45#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) 49#define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock)
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index f48e0dad8b3d..68e559f3631c 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -3,15 +3,10 @@
3 3
4#include <linux/kernel.h> 4#include <linux/kernel.h>
5#include <asm/segment.h> 5#include <asm/segment.h>
6#include <asm/alternative.h>
6 7
7#ifdef __KERNEL__ 8#ifdef __KERNEL__
8 9
9#ifdef CONFIG_SMP
10#define LOCK_PREFIX "lock ; "
11#else
12#define LOCK_PREFIX ""
13#endif
14
15#define __STR(x) #x 10#define __STR(x) #x
16#define STR(x) __STR(x) 11#define STR(x) __STR(x)
17 12
@@ -34,7 +29,7 @@
34 "thread_return:\n\t" \ 29 "thread_return:\n\t" \
35 "movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \ 30 "movq %%gs:%P[pda_pcurrent],%%rsi\n\t" \
36 "movq %P[thread_info](%%rsi),%%r8\n\t" \ 31 "movq %P[thread_info](%%rsi),%%r8\n\t" \
37 LOCK "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \ 32 LOCK_PREFIX "btr %[tif_fork],%P[ti_flags](%%r8)\n\t" \
38 "movq %%rax,%%rdi\n\t" \ 33 "movq %%rax,%%rdi\n\t" \
39 "jc ret_from_fork\n\t" \ 34 "jc ret_from_fork\n\t" \
40 RESTORE_CONTEXT \ 35 RESTORE_CONTEXT \
@@ -69,82 +64,6 @@ extern void load_gs_index(unsigned);
69 ".previous" \ 64 ".previous" \
70 : :"r" (value), "r" (0)) 65 : :"r" (value), "r" (0))
71 66
72#ifdef __KERNEL__
73struct alt_instr {
74 __u8 *instr; /* original instruction */
75 __u8 *replacement;
76 __u8 cpuid; /* cpuid bit set for replacement */
77 __u8 instrlen; /* length of original instruction */
78 __u8 replacementlen; /* length of new instruction, <= instrlen */
79 __u8 pad[5];
80};
81#endif
82
83/*
84 * Alternative instructions for different CPU types or capabilities.
85 *
86 * This allows to use optimized instructions even on generic binary
87 * kernels.
88 *
89 * length of oldinstr must be longer or equal the length of newinstr
90 * It can be padded with nops as needed.
91 *
92 * For non barrier like inlines please define new variants
93 * without volatile and memory clobber.
94 */
95#define alternative(oldinstr, newinstr, feature) \
96 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
97 ".section .altinstructions,\"a\"\n" \
98 " .align 8\n" \
99 " .quad 661b\n" /* label */ \
100 " .quad 663f\n" /* new instruction */ \
101 " .byte %c0\n" /* feature bit */ \
102 " .byte 662b-661b\n" /* sourcelen */ \
103 " .byte 664f-663f\n" /* replacementlen */ \
104 ".previous\n" \
105 ".section .altinstr_replacement,\"ax\"\n" \
106 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
107 ".previous" :: "i" (feature) : "memory")
108
109/*
110 * Alternative inline assembly with input.
111 *
112 * Peculiarities:
113 * No memory clobber here.
114 * Argument numbers start with 1.
115 * Best is to use constraints that are fixed size (like (%1) ... "r")
116 * If you use variable sized constraints like "m" or "g" in the
117 * replacement make sure to pad to the worst case length.
118 */
119#define alternative_input(oldinstr, newinstr, feature, input...) \
120 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
121 ".section .altinstructions,\"a\"\n" \
122 " .align 8\n" \
123 " .quad 661b\n" /* label */ \
124 " .quad 663f\n" /* new instruction */ \
125 " .byte %c0\n" /* feature bit */ \
126 " .byte 662b-661b\n" /* sourcelen */ \
127 " .byte 664f-663f\n" /* replacementlen */ \
128 ".previous\n" \
129 ".section .altinstr_replacement,\"ax\"\n" \
130 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
131 ".previous" :: "i" (feature), ##input)
132
133/* Like alternative_input, but with a single output argument */
134#define alternative_io(oldinstr, newinstr, feature, output, input...) \
135 asm volatile ("661:\n\t" oldinstr "\n662:\n" \
136 ".section .altinstructions,\"a\"\n" \
137 " .align 8\n" \
138 " .quad 661b\n" /* label */ \
139 " .quad 663f\n" /* new instruction */ \
140 " .byte %c[feat]\n" /* feature bit */ \
141 " .byte 662b-661b\n" /* sourcelen */ \
142 " .byte 664f-663f\n" /* replacementlen */ \
143 ".previous\n" \
144 ".section .altinstr_replacement,\"ax\"\n" \
145 "663:\n\t" newinstr "\n664:\n" /* replacement */ \
146 ".previous" : output : [feat] "i" (feature), ##input)
147
148/* 67/*
149 * Clear and set 'TS' bit respectively 68 * Clear and set 'TS' bit respectively
150 */ 69 */
@@ -366,5 +285,6 @@ static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
366void cpu_idle_wait(void); 285void cpu_idle_wait(void);
367 286
368extern unsigned long arch_align_stack(unsigned long sp); 287extern unsigned long arch_align_stack(unsigned long sp);
288extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
369 289
370#endif 290#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-21 06:59:17 -0500