1#ifndef ARCH_PPC_H 2#define ARCH_PPC_H 3 4#include <unistd.h> 5#include <stdlib.h> 6#include <sys/types.h> 7#include <sys/wait.h> 8 9#define FIO_ARCH (arch_ppc) 10 11#ifndef __NR_ioprio_set 12#define __NR_ioprio_set 273 13#define __NR_ioprio_get 274 14#endif 15 16#ifndef __NR_fadvise64 17#define __NR_fadvise64 233 18#endif 19 20#ifndef __NR_sys_splice 21#define __NR_sys_splice 283 22#define __NR_sys_tee 284 23#define __NR_sys_vmsplice 285 24#endif 25 26#define nop do { } while (0) 27 28#ifdef __powerpc64__ 29#define read_barrier() __asm__ __volatile__ ("lwsync" : : : "memory") 30#else 31#define read_barrier() __asm__ __volatile__ ("sync" : : : "memory") 32#endif 33 34#define write_barrier() __asm__ __volatile__ ("sync" : : : "memory") 35 36static inline int __ilog2(unsigned long bitmask) 37{ 38 int lz; 39 40 asm ("cntlzw %0,%1" : "=r" (lz) : "r" (bitmask)); 41 return 31 - lz; 42} 43 44static inline int arch_ffz(unsigned long bitmask) 45{ 46 if ((bitmask = ~bitmask) == 0) 47 return 32; 48 return __ilog2(bitmask & -bitmask); 49} 50 51static inline unsigned int mfspr(unsigned int reg) 52{ 53 unsigned int val; 54 55 asm volatile("mfspr %0,%1": "=r" (val) : "K" (reg)); 56 return val; 57} 58 59#define SPRN_TBRL 0x10C /* Time Base Register Lower */ 60#define SPRN_TBRU 0x10D /* Time Base Register Upper */ 61#define SPRN_ATBL 0x20E /* Alternate Time Base Lower */ 62#define SPRN_ATBU 0x20F /* Alternate Time Base Upper */ 63 64static inline unsigned long long get_cpu_clock(void) 65{ 66 unsigned int tbl, tbu0, tbu1; 67 unsigned long long ret; 68 69 do { 70 if (arch_flags & ARCH_FLAG_1) { 71 tbu0 = mfspr(SPRN_ATBU); 72 tbl = mfspr(SPRN_ATBL); 73 tbu1 = mfspr(SPRN_ATBU); 74 } else { 75 tbu0 = mfspr(SPRN_TBRU); 76 tbl = mfspr(SPRN_TBRL); 77 tbu1 = mfspr(SPRN_TBRU); 78 } 79 } while (tbu0 != tbu1); 80 81 ret = (((unsigned long long)tbu0) << 32) | tbl; 82 return ret; 83} 84 85#if 0 86static void atb_child(void) 87{ 88 arch_flags |= ARCH_FLAG_1; 89 get_cpu_clock(); 90 _exit(0); 91} 92 93static void atb_clocktest(void) 94{ 95 pid_t pid; 96 97 pid = fork(); 98 if (!pid) 99 atb_child(); 100 else if (pid != -1) { 101 int status; 102 103 pid = wait(&status); 104 if (pid == -1 || !WIFEXITED(status)) 105 arch_flags &= ~ARCH_FLAG_1; 106 else 107 arch_flags |= ARCH_FLAG_1; 108 } 109} 110#endif 111 112#define ARCH_HAVE_INIT 113extern int tsc_reliable; 114 115static inline int arch_init(char *envp[]) 116{ 117#if 0 118 tsc_reliable = 1; 119 atb_clocktest(); 120#endif 121 return 0; 122} 123 124#define ARCH_HAVE_FFZ 125 126/* 127 * We don't have it on all platforms, lets comment this out until we 128 * can handle it more intelligently. 129 * 130 * #define ARCH_HAVE_CPU_CLOCK 131 */ 132 133#endif 134