| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 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 | __s64 stamp_xtime_sec; /* xtime secs as at tb_orig_stamp */ |
| 85 | __s64 stamp_xtime_nsec; /* xtime nsecs as at tb_orig_stamp */ |
| 86 | __u32 hrtimer_res; /* hrtimer resolution */ |
| 87 | __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */ |
| 88 | __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */ |
| 89 | }; |
| 90 | |
| 91 | #else /* CONFIG_PPC64 */ |
| 92 | |
| 93 | /* |
| 94 | * And here is the simpler 32 bits version |
| 95 | */ |
| 96 | struct vdso_data { |
| 97 | __u64 tb_orig_stamp; /* Timebase at boot 0x30 */ |
| 98 | __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ |
| 99 | __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */ |
| 100 | __u64 stamp_xsec; /* 0x48 */ |
| 101 | __u32 tb_update_count; /* Timebase atomicity ctr 0x50 */ |
| 102 | __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */ |
| 103 | __u32 tz_dsttime; /* Type of dst correction 0x5C */ |
| 104 | __s32 wtom_clock_sec; /* Wall to monotonic clock */ |
| 105 | __s32 wtom_clock_nsec; |
| 106 | __s32 stamp_xtime_sec; /* xtime seconds as at tb_orig_stamp */ |
| 107 | __s32 stamp_xtime_nsec; /* xtime nsecs as at tb_orig_stamp */ |
| 108 | __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */ |
| 109 | __u32 hrtimer_res; /* hrtimer resolution */ |
| 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 */ |