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74205b3fc2
This patch adds the necessary glue to provide time namespaces. Things are mainly copied from ARM64. __arch_get_timens_vdso_data() calculates timens vdso data position based on the vdso data position, knowing it is the next page in vvar. This avoids having to redo the mflr/bcl/mflr/mtlr dance to locate the page relative to running code position. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Vincenzo Frascino <vincenzo.frascino@arm.com> # vDSO parts Acked-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1a15495f80ec19a87b16cf874dbf7c3fa5ec40fe.1617209142.git.christophe.leroy@csgroup.eu
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/* 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 <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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/*
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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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#include <vdso/datapage.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_arch_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; /* (NU) 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; /* (NU) Inverse of TB to 2^20 0x40 */
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__u64 stamp_xsec; /* (NU) 0x48 */
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__u64 tb_update_count; /* (NU) Timebase atomicity ctr 0x50 */
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__u32 tz_minuteswest; /* (NU) Min. west of Greenwich 0x58 */
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__u32 tz_dsttime; /* (NU) 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 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
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__u32 compat_syscall_map[SYSCALL_MAP_SIZE]; /* Map of compat syscalls */
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struct vdso_data data[CS_BASES];
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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_arch_data {
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__u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
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__u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
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__u32 compat_syscall_map[0]; /* No compat syscalls on PPC32 */
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struct vdso_data data[CS_BASES];
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};
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#endif /* CONFIG_PPC64 */
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extern struct vdso_arch_data *vdso_data;
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#else /* __ASSEMBLY__ */
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.macro get_datapage ptr
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bcl 20, 31, .+4
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999:
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mflr \ptr
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addis \ptr, \ptr, (_vdso_datapage - 999b)@ha
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addi \ptr, \ptr, (_vdso_datapage - 999b)@l
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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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