1 #ifndef _ASM_PPC64_MEMORY_H_
2 #define _ASM_PPC64_MEMORY_H_
3
4 /*
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version
8 * 2 of the License, or (at your option) any later version.
9 */
10
11 #include <linux/config.h>
12
13 /*
14 * Arguably the bitops and *xchg operations don't imply any memory barrier
15 * or SMP ordering, but in fact a lot of drivers expect them to imply
16 * both, since they do on x86 cpus.
17 */
18 #ifdef CONFIG_SMP
19 #define EIEIO_ON_SMP "eieio\n"
20 #define ISYNC_ON_SMP "\n\tisync"
21 #else
22 #define EIEIO_ON_SMP
23 #define ISYNC_ON_SMP
24 #endif
25
eieio(void)26 static inline void eieio(void)
27 {
28 __asm__ __volatile__ ("eieio" : : : "memory");
29 }
30
isync(void)31 static inline void isync(void)
32 {
33 __asm__ __volatile__ ("isync" : : : "memory");
34 }
35
36 #ifdef CONFIG_SMP
37 #define eieio_on_smp() eieio()
38 #define isync_on_smp() isync()
39 #else
40 #define eieio_on_smp() __asm__ __volatile__("": : :"memory")
41 #define isync_on_smp() __asm__ __volatile__("": : :"memory")
42 #endif
43
44 /* Macros for adjusting thread priority (hardware multi-threading) */
45
46 #define HMT_very_low() asm volatile("or 31,31,31 # very low priority")
47 #define HMT_low() asm volatile("or 1,1,1 # low priority")
48 #define HMT_medium_low() asm volatile("or 6,6,6 # medium low priority")
49 #define HMT_medium() asm volatile("or 2,2,2 # medium priority")
50 #define HMT_medium_high() asm volatile("or 5,5,5 # medium high priority")
51 #define HMT_high() asm volatile("or 3,3,3 # high priority")
52
53 #define HMT_VERY_LOW "\tor 31,31,31 # very low priority\n"
54 #define HMT_LOW "\tor 1,1,1 # low priority\n"
55 #define HMT_MEDIUM_LOW "\tor 6,6,6 # medium low priority\n"
56 #define HMT_MEDIUM "\tor 2,2,2 # medium priority\n"
57 #define HMT_MEDIUM_HIGH "\tor 5,5,5 # medium high priority\n"
58 #define HMT_HIGH "\tor 3,3,3 # high priority\n"
59
60 /*
61 * Various operational modes for SMT
62 * Off : never run threaded
63 * On : always run threaded
64 * Dynamic: Allow the system to switch modes as needed
65 */
66 #define SMT_OFF 0
67 #define SMT_ON 1
68 #define SMT_DYNAMIC 2
69
70 #endif
71