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/* 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];
struct vdso_rng_data rng_data;
};
#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];
struct vdso_rng_data rng_data;
};
#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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