1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _VDSO_DATAPAGE_H 3 #define _VDSO_DATAPAGE_H 4 #ifdef __KERNEL__ 5 6 /* 7 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM 8 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>, 9 * IBM Corp. 10 */ 11 12 13 /* 14 * Note about this structure: 15 * 16 * This structure was historically called systemcfg and exposed to 17 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an 18 * ABI issue as some proprietary software started relying on being able 19 * to mmap() it, thus we have to keep the base layout at least for a 20 * few kernel versions. 21 * 22 * However, since ppc32 doesn't suffer from this backward handicap, 23 * a simpler version of the data structure is used there with only the 24 * fields actually used by the vDSO. 25 * 26 */ 27 28 /* 29 * If the major version changes we are incompatible. 30 * Minor version changes are a hint. 31 */ 32 #define SYSTEMCFG_MAJOR 1 33 #define SYSTEMCFG_MINOR 1 34 35 #ifndef __ASSEMBLY__ 36 37 #include <linux/unistd.h> 38 #include <linux/time.h> 39 40 #define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32) 41 42 /* 43 * So here is the ppc64 backward compatible version 44 */ 45 46 #ifdef CONFIG_PPC64 47 48 struct vdso_data { 49 __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */ 50 struct { /* Systemcfg version numbers */ 51 __u32 major; /* Major number 0x10 */ 52 __u32 minor; /* Minor number 0x14 */ 53 } version; 54 55 /* Note about the platform flags: it now only contains the lpar 56 * bit. The actual platform number is dead and buried 57 */ 58 __u32 platform; /* Platform flags 0x18 */ 59 __u32 processor; /* Processor type 0x1C */ 60 __u64 processorCount; /* # of physical processors 0x20 */ 61 __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */ 62 __u64 tb_orig_stamp; /* Timebase at boot 0x30 */ 63 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ 64 __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */ 65 __u64 stamp_xsec; /* 0x48 */ 66 __u64 tb_update_count; /* Timebase atomicity ctr 0x50 */ 67 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */ 68 __u32 tz_dsttime; /* Type of dst correction 0x5C */ 69 __u32 dcache_size; /* L1 d-cache size 0x60 */ 70 __u32 dcache_line_size; /* L1 d-cache line size 0x64 */ 71 __u32 icache_size; /* L1 i-cache size 0x68 */ 72 __u32 icache_line_size; /* L1 i-cache line size 0x6C */ 73 74 /* those additional ones don't have to be located anywhere 75 * special as they were not part of the original systemcfg 76 */ 77 __u32 dcache_block_size; /* L1 d-cache block size */ 78 __u32 icache_block_size; /* L1 i-cache block size */ 79 __u32 dcache_log_block_size; /* L1 d-cache log block size */ 80 __u32 icache_log_block_size; /* L1 i-cache log block size */ 81 __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */ 82 __s32 wtom_clock_nsec; /* Wall to monotonic clock nsec */ 83 __s64 wtom_clock_sec; /* Wall to monotonic clock sec */ 84 struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */ 85 __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */ 86 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */ 87 }; 88 89 #else /* CONFIG_PPC64 */ 90 91 /* 92 * And here is the simpler 32 bits version 93 */ 94 struct vdso_data { 95 __u64 tb_orig_stamp; /* Timebase at boot 0x30 */ 96 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ 97 __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */ 98 __u64 stamp_xsec; /* 0x48 */ 99 __u32 tb_update_count; /* Timebase atomicity ctr 0x50 */ 100 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */ 101 __u32 tz_dsttime; /* Type of dst correction 0x5C */ 102 __s32 wtom_clock_sec; /* Wall to monotonic clock */ 103 __s32 wtom_clock_nsec; 104 struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */ 105 __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */ 106 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */ 107 __u32 dcache_block_size; /* L1 d-cache block size */ 108 __u32 icache_block_size; /* L1 i-cache block size */ 109 __u32 dcache_log_block_size; /* L1 d-cache log block size */ 110 __u32 icache_log_block_size; /* L1 i-cache log block size */ 111 }; 112 113 #endif /* CONFIG_PPC64 */ 114 115 extern struct vdso_data *vdso_data; 116 117 #endif /* __ASSEMBLY__ */ 118 119 #endif /* __KERNEL__ */ 120 #endif /* _SYSTEMCFG_H */ 121