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