include/asm-powerpc/vdso_datapage.h

   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
  43 #define SYSCALL_MAP_SIZE      ((__NR_syscalls + 31) / 32)
  44
  45 /*
  46  * So here is the ppc64 backward compatible version
  47  */
  48
  49 #ifdef CONFIG_PPC64
  50
  51 struct vdso_data {
  52         __u8  eye_catcher[16];          /* Eyecatcher: SYSTEMCFG:PPC64  0x00 */
  53         struct {                        /* Systemcfg version numbers         */
  54                 __u32 major;            /* Major number                 0x10 */
  55                 __u32 minor;            /* Minor number                 0x14 */
  56         } version;
  57
  58         /* Note about the platform flags: it now only contains the lpar
  59          * bit. The actual platform number is dead and burried
  60          */
  61         __u32 platform;                 /* Platform flags               0x18 */
  62         __u32 processor;                /* Processor type               0x1C */
  63         __u64 processorCount;           /* # of physical processors     0x20 */
  64         __u64 physicalMemorySize;       /* Size of real memory(B)       0x28 */
  65         __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
  66         __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
  67         __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
  68         __u64 stamp_xsec;               /*                              0x48 */
  69         __u64 tb_update_count;          /* Timebase atomicity ctr       0x50 */
  70         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
  71         __u32 tz_dsttime;               /* Type of dst correction       0x5C */
  72         __u32 dcache_size;              /* L1 d-cache size              0x60 */
  73         __u32 dcache_line_size;         /* L1 d-cache line size         0x64 */
  74         __u32 icache_size;              /* L1 i-cache size              0x68 */
  75         __u32 icache_line_size;         /* L1 i-cache line size         0x6C */
  76
  77         /* those additional ones don't have to be located anywhere
  78          * special as they were not part of the original systemcfg
  79          */
  80         __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
  81         __s32 wtom_clock_nsec;
  82         __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
  83         __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
  84 };
  85
  86 #else /* CONFIG_PPC64 */
  87
  88 /*
  89  * And here is the simpler 32 bits version
  90  */
  91 struct vdso_data {
  92         __u64 tb_orig_stamp;            /* Timebase at boot             0x30 */
  93         __u64 tb_ticks_per_sec;         /* Timebase tics / sec          0x38 */
  94         __u64 tb_to_xs;                 /* Inverse of TB to 2^20        0x40 */
  95         __u64 stamp_xsec;               /*                              0x48 */
  96         __u32 tb_update_count;          /* Timebase atomicity ctr       0x50 */
  97         __u32 tz_minuteswest;           /* Minutes west of Greenwich    0x58 */
  98         __u32 tz_dsttime;               /* Type of dst correction       0x5C */
  99         __s32 wtom_clock_sec;                   /* Wall to monotonic clock */
 100         __s32 wtom_clock_nsec;
 101         __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
 102 };
 103
 104 #endif /* CONFIG_PPC64 */
 105
 106 #ifdef __KERNEL__
 107 extern struct vdso_data *vdso_data;
 108 #endif
 109
 110 #endif /* __ASSEMBLY__ */
 111
 112 #endif /* __KERNEL__ */
 113 #endif /* _SYSTEMCFG_H */