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130 lines
4.3 KiB
130 lines
4.3 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef _VDSO_DATAPAGE_H |
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#define _VDSO_DATAPAGE_H |
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#ifdef __KERNEL__ |
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/* |
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* Copyright (C) 2002 Peter Bergner <[email protected]>, IBM |
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* Copyright (C) 2005 Benjamin Herrenschmidy <[email protected]>, |
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* IBM Corp. |
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*/ |
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/* |
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* Note about this structure: |
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* |
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* This structure was historically called systemcfg and exposed to |
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* userland via /proc/ppc64/systemcfg. Unfortunately, this became an |
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* ABI issue as some proprietary software started relying on being able |
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* to mmap() it, thus we have to keep the base layout at least for a |
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* few kernel versions. |
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* |
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* However, since ppc32 doesn't suffer from this backward handicap, |
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* a simpler version of the data structure is used there with only the |
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* fields actually used by the vDSO. |
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* |
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*/ |
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/* |
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* If the major version changes we are incompatible. |
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* Minor version changes are a hint. |
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*/ |
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#define SYSTEMCFG_MAJOR 1 |
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#define SYSTEMCFG_MINOR 1 |
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#ifndef __ASSEMBLY__ |
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#include <linux/unistd.h> |
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#include <linux/time.h> |
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#define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32) |
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/* |
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* So here is the ppc64 backward compatible version |
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*/ |
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#ifdef CONFIG_PPC64 |
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struct vdso_data { |
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__u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */ |
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struct { /* Systemcfg version numbers */ |
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__u32 major; /* Major number 0x10 */ |
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__u32 minor; /* Minor number 0x14 */ |
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} version; |
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/* Note about the platform flags: it now only contains the lpar |
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* bit. The actual platform number is dead and buried |
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*/ |
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__u32 platform; /* Platform flags 0x18 */ |
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__u32 processor; /* Processor type 0x1C */ |
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__u64 processorCount; /* # of physical processors 0x20 */ |
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__u64 physicalMemorySize; /* Size of real memory(B) 0x28 */ |
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__u64 tb_orig_stamp; /* Timebase at boot 0x30 */ |
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__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ |
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__u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */ |
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__u64 stamp_xsec; /* 0x48 */ |
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__u64 tb_update_count; /* Timebase atomicity ctr 0x50 */ |
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__u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */ |
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__u32 tz_dsttime; /* Type of dst correction 0x5C */ |
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__u32 dcache_size; /* L1 d-cache size 0x60 */ |
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__u32 dcache_line_size; /* L1 d-cache line size 0x64 */ |
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__u32 icache_size; /* L1 i-cache size 0x68 */ |
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__u32 icache_line_size; /* L1 i-cache line size 0x6C */ |
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/* those additional ones don't have to be located anywhere |
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* special as they were not part of the original systemcfg |
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*/ |
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__u32 dcache_block_size; /* L1 d-cache block size */ |
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__u32 icache_block_size; /* L1 i-cache block size */ |
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__u32 dcache_log_block_size; /* L1 d-cache log block size */ |
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__u32 icache_log_block_size; /* L1 i-cache log block size */ |
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__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */ |
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__s32 wtom_clock_nsec; /* Wall to monotonic clock nsec */ |
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__s64 wtom_clock_sec; /* Wall to monotonic clock sec */ |
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__s64 stamp_xtime_sec; /* xtime secs as at tb_orig_stamp */ |
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__s64 stamp_xtime_nsec; /* xtime nsecs as at tb_orig_stamp */ |
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__u32 hrtimer_res; /* hrtimer resolution */ |
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__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */ |
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__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */ |
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}; |
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#else /* CONFIG_PPC64 */ |
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/* |
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* And here is the simpler 32 bits version |
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*/ |
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struct vdso_data { |
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__u64 tb_orig_stamp; /* Timebase at boot 0x30 */ |
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__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ |
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__u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */ |
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__u64 stamp_xsec; /* 0x48 */ |
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__u32 tb_update_count; /* Timebase atomicity ctr 0x50 */ |
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__u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */ |
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__u32 tz_dsttime; /* Type of dst correction 0x5C */ |
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__s32 wtom_clock_sec; /* Wall to monotonic clock */ |
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__s32 wtom_clock_nsec; |
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__s32 stamp_xtime_sec; /* xtime seconds as at tb_orig_stamp */ |
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__s32 stamp_xtime_nsec; /* xtime nsecs as at tb_orig_stamp */ |
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__u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */ |
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__u32 hrtimer_res; /* hrtimer resolution */ |
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__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */ |
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}; |
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#endif /* CONFIG_PPC64 */ |
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extern struct vdso_data *vdso_data; |
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#else /* __ASSEMBLY__ */ |
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.macro get_datapage ptr, tmp |
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bcl 20, 31, .+4 |
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mflr \ptr |
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addi \ptr, \ptr, (__kernel_datapage_offset - (.-4))@l |
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lwz \tmp, 0(\ptr) |
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add \ptr, \tmp, \ptr |
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.endm |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __KERNEL__ */ |
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#endif /* _SYSTEMCFG_H */
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