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Linux/arch/powerpc/include/asm/vdso_datapage.h

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  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 
 52 struct 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  */
 98 struct 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 
119 extern struct vdso_data *vdso_data;
120 
121 #endif /* __ASSEMBLY__ */
122 
123 #endif /* __KERNEL__ */
124 #endif /* _SYSTEMCFG_H */
125 

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