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vdso_datapage.h
/* SPDX-License-Identifier: GPL-2.0-or-later */ #ifndef _VDSO_DATAPAGE_H #define _VDSO_DATAPAGE_H #ifdef __KERNEL__ /* * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>, * IBM Corp. */ /* * Note about this structure: * * This structure was historically called systemcfg and exposed to * userland via /proc/ppc64/systemcfg. Unfortunately, this became an * ABI issue as some proprietary software started relying on being able * to mmap() it, thus we have to keep the base layout at least for a * few kernel versions. * * However, since ppc32 doesn't suffer from this backward handicap, * a simpler version of the data structure is used there with only the * fields actually used by the vDSO. * */ /* * If the major version changes we are incompatible. * Minor version changes are a hint. */ #define SYSTEMCFG_MAJOR 1 #define SYSTEMCFG_MINOR 1 #ifndef __ASSEMBLY__ #include <linux/unistd.h> #include <linux/time.h> #include <vdso/datapage.h> #define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32) /* * So here is the ppc64 backward compatible version */ #ifdef CONFIG_PPC64 struct vdso_arch_data { __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */ struct { /* Systemcfg version numbers */ __u32 major; /* Major number 0x10 */ __u32 minor; /* Minor number 0x14 */ } version; /* Note about the platform flags: it now only contains the lpar * bit. The actual platform number is dead and buried */ __u32 platform; /* Platform flags 0x18 */ __u32 processor; /* Processor type 0x1C */ __u64 processorCount; /* # of physical processors 0x20 */ __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */ __u64 tb_orig_stamp; /* (NU) Timebase at boot 0x30 */ __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ __u64 tb_to_xs; /* (NU) Inverse of TB to 2^20 0x40 */ __u64 stamp_xsec; /* (NU) 0x48 */ __u64 tb_update_count; /* (NU) Timebase atomicity ctr 0x50 */ __u32 tz_minuteswest; /* (NU) Min. west of Greenwich 0x58 */ __u32 tz_dsttime; /* (NU) Type of dst correction 0x5C */ __u32 dcache_size; /* L1 d-cache size 0x60 */ __u32 dcache_line_size; /* L1 d-cache line size 0x64 */ __u32 icache_size; /* L1 i-cache size 0x68 */ __u32 icache_line_size; /* L1 i-cache line size 0x6C */ /* those additional ones don't have to be located anywhere * special as they were not part of the original systemcfg */ __u32 dcache_block_size; /* L1 d-cache block size */ __u32 icache_block_size; /* L1 i-cache block size */ __u32 dcache_log_block_size; /* L1 d-cache log block size */ __u32 icache_log_block_size; /* L1 i-cache log block size */ __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */ __u32 compat_syscall_map[SYSCALL_MAP_SIZE]; /* Map of compat syscalls */ struct vdso_data data[CS_BASES]; }; #else /* CONFIG_PPC64 */ /* * And here is the simpler 32 bits version */ struct vdso_arch_data { __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */ __u32 compat_syscall_map[0]; /* No compat syscalls on PPC32 */ struct vdso_data data[CS_BASES]; }; #endif /* CONFIG_PPC64 */ extern struct vdso_arch_data *vdso_data; #else /* __ASSEMBLY__ */ .macro get_datapage ptr bcl 20, 31, .+4 999: mflr \ptr addis \ptr, \ptr, (_vdso_datapage - 999b)@ha addi \ptr, \ptr, (_vdso_datapage - 999b)@l .endm #include <asm/asm-offsets.h> #include <asm/page.h> .macro get_realdatapage ptr scratch get_datapage \ptr #ifdef CONFIG_TIME_NS lwz \scratch, VDSO_CLOCKMODE_OFFSET(\ptr) xoris \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@h xori \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@l cntlzw \scratch, \scratch rlwinm \scratch, \scratch, PAGE_SHIFT - 5, 1 << PAGE_SHIFT add \ptr, \ptr, \scratch #endif .endm #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ #endif /* _SYSTEMCFG_H */
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