diff options
Diffstat (limited to 'arch/powerpc/include/asm/vdso_datapage.h')
| -rw-r--r-- | arch/powerpc/include/asm/vdso_datapage.h | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/vdso_datapage.h b/arch/powerpc/include/asm/vdso_datapage.h new file mode 100644 index 000000000..a585c8e53 --- /dev/null +++ b/arch/powerpc/include/asm/vdso_datapage.h @@ -0,0 +1,117 @@ +/* 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 + +#endif /* __ASSEMBLY__ */ + +#endif /* __KERNEL__ */ +#endif /* _SYSTEMCFG_H */ |