include/asm-powerpc/vdso_datapage.h

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