LXR linux/arch/powerpc/include/asm/vdso

   1#ifndef _VDSO_DATAPAGE_H
   2#define _VDSO_DATAPAGE_H
   3#ifdef __KERNEL__
   4
   5/*
   6 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
   7 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
   8 *                    IBM Corp.
   9 *
  10 * This program is free software; you can redistribute it and/or
  11 * modify it under the terms of the GNU General Public License
  12 * as published by the Free Software Foundation; either version
  13 * 2 of the License, or (at your option) any later version.
  14 */
  15
  16
  17/*
  18 * Note about this structure:
  19 *
  20 * This structure was historically called systemcfg and exposed to
  21 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
  22 * ABI issue as some proprietary software started relying on being able
  23 * to mmap() it, thus we have to keep the base layout at least for a
  24 * few kernel versions.
  25 *
  26 * However, since ppc32 doesn't suffer from this backward handicap,
  27 * a simpler version of the data structure is used there with only the
  28 * fields actually used by the vDSO.
  29 *
  30 */
  31
  32/*
  33 * If the major version changes we are incompatible.
  34 * Minor version changes are a hint.
  35 */
  36#define SYSTEMCFG_MAJOR 1
  37#define SYSTEMCFG_MINOR 1
  38
  39#ifndef __ASSEMBLY__
  40
  41#include <linux/unistd.h>
  42#include <linux/time.h>
  43
  44#define SYSCALL_MAP_SIZE      ((NR_syscalls + 31) / 32)
  45
  46/*
  47 * So here is the ppc64 backward compatible version
  48 */
  49
  50#ifdef CONFIG_PPC64
  51
  52struct vdso_data {
  53        __u8  eye_catcher[16];          /* Eyecatcher: SYSTEMCFG:PPC64  0x00 */
  54        struct {                        /* Systemcfg version numbers         */
  55                __u32 major;            /* Major number                 0x10 */
  56                __u32 minor;            /* Minor number                 0x14 */
  57        } version;
  58
  59        /* Note about the platform flags: it now only contains the lpar
  60         * bit. The actual platform number is dead and buried
  61         */
  62        __u32 platform;                 /* Platform flags               0x18 */
  63        __u32 processor;                /* Processor type               0x1C */
  64        __u64 processorCount;           /* # of physical processors     0x20 */
  65        __u64 physicalMemorySize;       /* Size of real memory(B)       0x28 */
  66        __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
  67        __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
  68        __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
  69        __u64 stamp_xsec;               /*                              0x48 */
  70        __u64 tb_update_count;          /* Timebase atomicity ctr       0x50 */
  71        __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
  72        __u32 tz_dsttime;               /* Type of dst correction       0x5C */
  73        __u32 dcache_size;              /* L1 d-cache size              0x60 */
  74        __u32 dcache_line_size;         /* L1 d-cache line size         0x64 */
  75        __u32 icache_size;              /* L1 i-cache size              0x68 */
  76        __u32 icache_line_size;         /* L1 i-cache line size         0x6C */
  77
  78        /* those additional ones don't have to be located anywhere
  79         * special as they were not part of the original systemcfg
  80         */
  81        __u32 dcache_block_size;                /* L1 d-cache block size     */
  82        __u32 icache_block_size;                /* L1 i-cache block size     */
  83        __u32 dcache_log_block_size;            /* L1 d-cache log block size */
  84        __u32 icache_log_block_size;            /* L1 i-cache log block size */
  85        __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
  86        __s32 wtom_clock_nsec;
  87        struct timespec stamp_xtime;    /* xtime as at tb_orig_stamp */
  88        __u32 stamp_sec_fraction;       /* fractional seconds of stamp_xtime */
  89        __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
  90        __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
  91};
  92
  93#else /* CONFIG_PPC64 */
  94
  95/*
  96 * And here is the simpler 32 bits version
  97 */
  98struct vdso_data {
  99        __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
 100        __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
 101        __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
 102        __u64 stamp_xsec;               /*                              0x48 */
 103        __u32 tb_update_count;          /* Timebase atomicity ctr       0x50 */
 104        __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
 105        __u32 tz_dsttime;               /* Type of dst correction       0x5C */
 106        __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
 107        __s32 wtom_clock_nsec;
 108        struct timespec stamp_xtime;    /* xtime as at tb_orig_stamp */
 109        __u32 stamp_sec_fraction;       /* fractional seconds of stamp_xtime */
 110        __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
 111        __u32 dcache_block_size;        /* L1 d-cache block size     */
 112        __u32 icache_block_size;        /* L1 i-cache block size     */
 113        __u32 dcache_log_block_size;    /* L1 d-cache log block size */
 114        __u32 icache_log_block_size;    /* L1 i-cache log block size */
 115};
 116
 117#endif /* CONFIG_PPC64 */
 118
 119extern struct vdso_data *vdso_data;
 120
 121#endif /* __ASSEMBLY__ */
 122
 123#endif /* __KERNEL__ */
 124#endif /* _SYSTEMCFG_H */
 125