1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _VDSO_DATAPAGE_H 3 #define _VDSO_DATAPAGE_H 4 #ifdef __KERNEL__ 5 6 /* 7 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM 8 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>, 9 * IBM Corp. 10 */ 11 12 13 /* 14 * Note about this structure: 15 * 16 * This structure was historically called systemcfg and exposed to 17 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an 18 * ABI issue as some proprietary software started relying on being able 19 * to mmap() it, thus we have to keep the base layout at least for a 20 * few kernel versions. 21 * 22 * However, since ppc32 doesn't suffer from this backward handicap, 23 * a simpler version of the data structure is used there with only the 24 * fields actually used by the vDSO. 25 * 26 */ 27 28 /* 29 * If the major version changes we are incompatible. 30 * Minor version changes are a hint. 31 */ 32 #define SYSTEMCFG_MAJOR 1 33 #define SYSTEMCFG_MINOR 1 34 35 #ifndef __ASSEMBLY__ 36 37 #include <linux/unistd.h> 38 #include <linux/time.h> 39 #include <vdso/datapage.h> 40 41 #define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32) 42 43 /* 44 * So here is the ppc64 backward compatible version 45 */ 46 47 #ifdef CONFIG_PPC64 48 49 struct vdso_arch_data { 50 __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */ 51 struct { /* Systemcfg version numbers */ 52 __u32 major; /* Major number 0x10 */ 53 __u32 minor; /* Minor number 0x14 */ 54 } version; 55 56 /* Note about the platform flags: it now only contains the lpar 57 * bit. The actual platform number is dead and buried 58 */ 59 __u32 platform; /* Platform flags 0x18 */ 60 __u32 processor; /* Processor type 0x1C */ 61 __u64 processorCount; /* # of physical processors 0x20 */ 62 __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */ 63 __u64 tb_orig_stamp; /* (NU) Timebase at boot 0x30 */ 64 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ 65 __u64 tb_to_xs; /* (NU) Inverse of TB to 2^20 0x40 */ 66 __u64 stamp_xsec; /* (NU) 0x48 */ 67 __u64 tb_update_count; /* (NU) Timebase atomicity ctr 0x50 */ 68 __u32 tz_minuteswest; /* (NU) Min. west of Greenwich 0x58 */ 69 __u32 tz_dsttime; /* (NU) Type of dst correction 0x5C */ 70 __u32 dcache_size; /* L1 d-cache size 0x60 */ 71 __u32 dcache_line_size; /* L1 d-cache line size 0x64 */ 72 __u32 icache_size; /* L1 i-cache size 0x68 */ 73 __u32 icache_line_size; /* L1 i-cache line size 0x6C */ 74 75 /* those additional ones don't have to be located anywhere 76 * special as they were not part of the original systemcfg 77 */ 78 __u32 dcache_block_size; /* L1 d-cache block size */ 79 __u32 icache_block_size; /* L1 i-cache block size */ 80 __u32 dcache_log_block_size; /* L1 d-cache log block size */ 81 __u32 icache_log_block_size; /* L1 i-cache log block size */ 82 __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */ 83 __u32 compat_syscall_map[SYSCALL_MAP_SIZE]; /* Map of compat syscalls */ 84 85 struct vdso_data data[CS_BASES]; 86 struct vdso_rng_data rng_data; 87 }; 88 89 #else /* CONFIG_PPC64 */ 90 91 /* 92 * And here is the simpler 32 bits version 93 */ 94 struct vdso_arch_data { 95 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */ 96 __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */ 97 __u32 compat_syscall_map[0]; /* No compat syscalls on PPC32 */ 98 struct vdso_data data[CS_BASES]; 99 struct vdso_rng_data rng_data; 100 }; 101 102 #endif /* CONFIG_PPC64 */ 103 104 extern struct vdso_arch_data *vdso_data; 105 106 #else /* __ASSEMBLY__ */ 107 108 .macro get_datapage ptr 109 bcl 20, 31, .+4 110 999: 111 mflr \ptr 112 addis \ptr, \ptr, (_vdso_datapage - 999b)@ha 113 addi \ptr, \ptr, (_vdso_datapage - 999b)@l 114 .endm 115 116 #include <asm/asm-offsets.h> 117 #include <asm/page.h> 118 119 .macro get_realdatapage ptr scratch 120 get_datapage \ptr 121 #ifdef CONFIG_TIME_NS 122 lwz \scratch, VDSO_CLOCKMODE_OFFSET(\ptr) 123 xoris \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@h 124 xori \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@l 125 cntlzw \scratch, \scratch 126 rlwinm \scratch, \scratch, PAGE_SHIFT - 5, 1 << PAGE_SHIFT 127 add \ptr, \ptr, \scratch 128 #endif 129 .endm 130 131 #endif /* __ASSEMBLY__ */ 132 133 #endif /* __KERNEL__ */ 134 #endif /* _SYSTEMCFG_H */ 135