Logo Search packages:      
Sourcecode: linux version File versions

vdso_datapage.h

#ifndef _VDSO_DATAPAGE_H
#define _VDSO_DATAPAGE_H
#ifdef __KERNEL__

/*
 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
 *                IBM Corp.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */


/*
 * Note about this structure:
 *
 * This structure was historically called systemcfg and exposed to
 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
 * ABI issue as some proprietary software started relying on being able
 * to mmap() it, thus we have to keep the base layout at least for a
 * few kernel versions.
 *
 * However, since ppc32 doesn't suffer from this backward handicap,
 * a simpler version of the data structure is used there with only the
 * fields actually used by the vDSO.
 *
 */

/*
 * If the major version changes we are incompatible.
 * Minor version changes are a hint.
 */
#define SYSTEMCFG_MAJOR 1
#define SYSTEMCFG_MINOR 1

#ifndef __ASSEMBLY__

#include <linux/unistd.h>

#define SYSCALL_MAP_SIZE      ((__NR_syscalls + 31) / 32)

/*
 * So here is the ppc64 backward compatible version
 */

#ifdef CONFIG_PPC64

struct vdso_data {
      __u8  eye_catcher[16];        /* Eyecatcher: SYSTEMCFG:PPC64      0x00 */
      struct {                /* Systemcfg version numbers       */
            __u32 major;            /* Major number               0x10 */
            __u32 minor;            /* Minor number               0x14 */
      } version;

      /* Note about the platform flags: it now only contains the lpar
       * bit. The actual platform number is dead and burried
       */
      __u32 platform;               /* Platform flags       0x18 */
      __u32 processor;        /* Processor type       0x1C */
      __u64 processorCount;         /* # of physical processors   0x20 */
      __u64 physicalMemorySize;     /* Size of real memory(B)     0x28 */
      __u64 tb_orig_stamp;          /* Timebase at boot           0x30 */
      __u64 tb_ticks_per_sec;       /* Timebase tics / sec        0x38 */
      __u64 tb_to_xs;               /* Inverse of TB to 2^20      0x40 */
      __u64 stamp_xsec;       /*                      0x48 */
      __u64 tb_update_count;        /* Timebase atomicity ctr     0x50 */
      __u32 tz_minuteswest;         /* Minutes west of Greenwich  0x58 */
      __u32 tz_dsttime;       /* Type of dst correction     0x5C */
      __u32 dcache_size;            /* L1 d-cache size            0x60 */
      __u32 dcache_line_size;       /* L1 d-cache line size       0x64 */
      __u32 icache_size;            /* L1 i-cache size            0x68 */
      __u32 icache_line_size;       /* L1 i-cache line size       0x6C */

      /* those additional ones don't have to be located anywhere
       * special as they were not part of the original systemcfg
       */
      __u32 dcache_block_size;            /* L1 d-cache block size     */
      __u32 icache_block_size;            /* L1 i-cache block size     */
      __u32 dcache_log_block_size;        /* L1 d-cache log block size */
      __u32 icache_log_block_size;        /* L1 i-cache log block size */
      __s32 wtom_clock_sec;               /* Wall to monotonic clock */
      __s32 wtom_clock_nsec;
      __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
      __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
};

#else /* CONFIG_PPC64 */

/*
 * And here is the simpler 32 bits version
 */
struct vdso_data {
      __u64 tb_orig_stamp;          /* Timebase at boot           0x30 */
      __u64 tb_ticks_per_sec;       /* Timebase tics / sec        0x38 */
      __u64 tb_to_xs;               /* Inverse of TB to 2^20      0x40 */
      __u64 stamp_xsec;       /*                      0x48 */
      __u32 tb_update_count;        /* Timebase atomicity ctr     0x50 */
      __u32 tz_minuteswest;         /* Minutes west of Greenwich  0x58 */
      __u32 tz_dsttime;       /* Type of dst correction     0x5C */
      __s32 wtom_clock_sec;               /* Wall to monotonic clock */
      __s32 wtom_clock_nsec;
      __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
      __u32 dcache_block_size;      /* L1 d-cache block size     */
      __u32 icache_block_size;      /* L1 i-cache block size     */
      __u32 dcache_log_block_size;  /* L1 d-cache log block size */
      __u32 icache_log_block_size;  /* L1 i-cache log block size */
};

#endif /* CONFIG_PPC64 */

#ifdef __KERNEL__
extern struct vdso_data *vdso_data;
#endif

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */
#endif /* _SYSTEMCFG_H */

Generated by  Doxygen 1.6.0   Back to index