0c37ec2aa8
This fixes various errors in the new functions added in the vDSO's, I've now verified all functions on both 32 and 64 bits vDSOs. It also fix a sign extension bug getting the initial time of day at boot that could cause the monotonic clock value to be completely on bogus for 64 bits applications (with either the vDSO or the syscall) on powermacs. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
108 lines
3.4 KiB
C
108 lines
3.4 KiB
C
#ifndef _VDSO_DATAPAGE_H
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#define _VDSO_DATAPAGE_H
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/*
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* Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
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* Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
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* IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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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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#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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__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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__s32 wtom_clock_sec; /* Wall to monotonic clock */
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__s32 wtom_clock_nsec;
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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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__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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#ifdef __KERNEL__
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extern struct vdso_data *vdso_data;
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* _SYSTEMCFG_H */
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