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authorHirokazu Takata <takata@linux-m32r.org>2006-04-19 01:21:38 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-04-19 12:13:51 -0400
commit4127272c38619c56f0c1aa01d01c7bd757db70a1 (patch)
treed12ca9b4ba542a93957dc50c009928299ea66991 /include/asm-m32r
parentdd1c1e3e9ed04d33a698925238e527b7051f64b9 (diff)
[PATCH] m32r: update switch_to macro for tuning
- Remove unnecessary push/pop's of the switch_to() macro for performance tuning. - Cosmetic updates: change __inline__ to inline, etc. Signed-off-by: Hirokazu Takata <takata@linux-m32r.org> Cc: NIIBE Yutaka <gniibe@fsij.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-m32r')
-rw-r--r--include/asm-m32r/system.h67
1 files changed, 23 insertions, 44 deletions
diff --git a/include/asm-m32r/system.h b/include/asm-m32r/system.h
index c5ab5da56d21..e55013f378e5 100644
--- a/include/asm-m32r/system.h
+++ b/include/asm-m32r/system.h
@@ -6,8 +6,8 @@
6 * License. See the file "COPYING" in the main directory of this archive 6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details. 7 * for more details.
8 * 8 *
9 * Copyright (C) 2001 by Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto 9 * Copyright (C) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
10 * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> 10 * Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
11 */ 11 */
12 12
13#include <linux/config.h> 13#include <linux/config.h>
@@ -19,49 +19,28 @@
19 * switch_to(prev, next) should switch from task `prev' to `next' 19 * switch_to(prev, next) should switch from task `prev' to `next'
20 * `prev' will never be the same as `next'. 20 * `prev' will never be the same as `next'.
21 * 21 *
22 * `next' and `prev' should be struct task_struct, but it isn't always defined 22 * `next' and `prev' should be task_t, but it isn't always defined
23 */ 23 */
24 24
25#define switch_to(prev, next, last) do { \ 25#define switch_to(prev, next, last) do { \
26 register unsigned long arg0 __asm__ ("r0") = (unsigned long)prev; \
27 register unsigned long arg1 __asm__ ("r1") = (unsigned long)next; \
28 register unsigned long *oldsp __asm__ ("r2") = &(prev->thread.sp); \
29 register unsigned long *newsp __asm__ ("r3") = &(next->thread.sp); \
30 register unsigned long *oldlr __asm__ ("r4") = &(prev->thread.lr); \
31 register unsigned long *newlr __asm__ ("r5") = &(next->thread.lr); \
32 register struct task_struct *__last __asm__ ("r6"); \
33 __asm__ __volatile__ ( \ 26 __asm__ __volatile__ ( \
34 "st r8, @-r15 \n\t" \ 27 " seth lr, #high(1f) \n" \
35 "st r9, @-r15 \n\t" \ 28 " or3 lr, lr, #low(1f) \n" \
36 "st r10, @-r15 \n\t" \ 29 " st lr, @%4 ; store old LR \n" \
37 "st r11, @-r15 \n\t" \ 30 " ld lr, @%5 ; load new LR \n" \
38 "st r12, @-r15 \n\t" \ 31 " st sp, @%2 ; store old SP \n" \
39 "st r13, @-r15 \n\t" \ 32 " ld sp, @%3 ; load new SP \n" \
40 "st r14, @-r15 \n\t" \ 33 " push %1 ; store `prev' on new stack \n" \
41 "seth r14, #high(1f) \n\t" \ 34 " jmp lr \n" \
42 "or3 r14, r14, #low(1f) \n\t" \ 35 " .fillinsn \n" \
43 "st r14, @r4 ; store old LR \n\t" \ 36 "1: \n" \
44 "st r15, @r2 ; store old SP \n\t" \ 37 " pop %0 ; restore `__last' from new stack \n" \
45 "ld r15, @r3 ; load new SP \n\t" \ 38 : "=r" (last) \
46 "st r0, @-r15 ; store 'prev' onto new stack \n\t" \ 39 : "0" (prev), \
47 "ld r14, @r5 ; load new LR \n\t" \ 40 "r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \
48 "jmp r14 \n\t" \ 41 "r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \
49 ".fillinsn \n " \ 42 : "memory", "lr" \
50 "1: \n\t" \
51 "ld r6, @r15+ ; load 'prev' from new stack \n\t" \
52 "ld r14, @r15+ \n\t" \
53 "ld r13, @r15+ \n\t" \
54 "ld r12, @r15+ \n\t" \
55 "ld r11, @r15+ \n\t" \
56 "ld r10, @r15+ \n\t" \
57 "ld r9, @r15+ \n\t" \
58 "ld r8, @r15+ \n\t" \
59 : "=&r" (__last) \
60 : "r" (arg0), "r" (arg1), "r" (oldsp), "r" (newsp), \
61 "r" (oldlr), "r" (newlr) \
62 : "memory" \
63 ); \ 43 ); \
64 last = __last; \
65} while(0) 44} while(0)
66 45
67/* 46/*
@@ -167,8 +146,8 @@ extern void __xchg_called_with_bad_pointer(void);
167#define DCACHE_CLEAR(reg0, reg1, addr) 146#define DCACHE_CLEAR(reg0, reg1, addr)
168#endif /* CONFIG_CHIP_M32700_TS1 */ 147#endif /* CONFIG_CHIP_M32700_TS1 */
169 148
170static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr, 149static inline unsigned long
171 int size) 150__xchg(unsigned long x, volatile void * ptr, int size)
172{ 151{
173 unsigned long flags; 152 unsigned long flags;
174 unsigned long tmp = 0; 153 unsigned long tmp = 0;
@@ -220,7 +199,7 @@ static __inline__ unsigned long __xchg(unsigned long x, volatile void * ptr,
220 199
221#define __HAVE_ARCH_CMPXCHG 1 200#define __HAVE_ARCH_CMPXCHG 1
222 201
223static __inline__ unsigned long 202static inline unsigned long
224__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new) 203__cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
225{ 204{
226 unsigned long flags; 205 unsigned long flags;
@@ -254,7 +233,7 @@ __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new)
254 if something tries to do an invalid cmpxchg(). */ 233 if something tries to do an invalid cmpxchg(). */
255extern void __cmpxchg_called_with_bad_pointer(void); 234extern void __cmpxchg_called_with_bad_pointer(void);
256 235
257static __inline__ unsigned long 236static inline unsigned long
258__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size) 237__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new, int size)
259{ 238{
260 switch (size) { 239 switch (size) {
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 05:44:59 -0500