| /* 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 */ |
