projects / mirror_ubuntu-jammy-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 1da177e4 LT |
2 | /* |
| 3 | * Access to the shared data page by the vDSO & syscall map | |
| 4 | * | |
| 5 | * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), IBM Corp. | |
| 1da177e4 LT |
6 | */ |
| 7 | ||
| 1da177e4 LT |
8 | #include <asm/processor.h> |
| 9 | #include <asm/ppc_asm.h> | |
| 0013a854 | 10 | #include <asm/asm-offsets.h> |
| 1da177e4 LT |
11 | #include <asm/unistd.h> |
| 12 | #include <asm/vdso.h> | |
| 13 | ||
| 14 | .text | |
| c974809a MN |
15 | .global __kernel_datapage_offset; |
| 16 | __kernel_datapage_offset: | |
| 17 | .long 0 | |
| 18 | ||
| 1da177e4 LT |
19 | V_FUNCTION_BEGIN(__get_datapage) |
| 20 | .cfi_startproc | |
| 21 | /* We don't want that exposed or overridable as we want other objects | |
| 22 | * to be able to bl directly to here | |
| 23 | */ | |
| 24 | .protected __get_datapage | |
| 25 | .hidden __get_datapage | |
| 26 | ||
| 27 | mflr r0 | |
| 28 | .cfi_register lr,r0 | |
| 29 | ||
| c974809a MN |
30 | bcl 20,31,data_page_branch |
| 31 | data_page_branch: | |
| 1da177e4 LT |
32 | mflr r3 |
| 33 | mtlr r0 | |
| c974809a | 34 | addi r3, r3, __kernel_datapage_offset-data_page_branch |
| 1da177e4 | 35 | lwz r0,0(r3) |
| 56d20861 | 36 | .cfi_restore lr |
| 1da177e4 LT |
37 | add r3,r0,r3 |
| 38 | blr | |
| 39 | .cfi_endproc | |
| 40 | V_FUNCTION_END(__get_datapage) | |
| 41 | ||
| 42 | /* | |
| 43 | * void *__kernel_get_syscall_map(unsigned int *syscall_count) ; | |
| 44 | * | |
| 45 | * returns a pointer to the syscall map. the map is agnostic to the | |
| 46 | * size of "long", unlike kernel bitops, it stores bits from top to | |
| 47 | * bottom so that memory actually contains a linear bitmap | |
| 48 | * check for syscall N by testing bit (0x80000000 >> (N & 0x1f)) of | |
| 49 | * 32 bits int at N >> 5. | |
| 50 | */ | |
| 51 | V_FUNCTION_BEGIN(__kernel_get_syscall_map) | |
| 52 | .cfi_startproc | |
| 53 | mflr r12 | |
| 54 | .cfi_register lr,r12 | |
| 1da177e4 LT |
55 | mr r4,r3 |
| 56 | bl __get_datapage@local | |
| 57 | mtlr r12 | |
| 58 | addi r3,r3,CFG_SYSCALL_MAP32 | |
| 59 | cmpli cr0,r4,0 | |
| 60 | beqlr | |
| f43194e4 | 61 | li r0,NR_syscalls |
| 1da177e4 | 62 | stw r0,0(r4) |
| 5d66da3d | 63 | crclr cr0*4+so |
| 1da177e4 LT |
64 | blr |
| 65 | .cfi_endproc | |
| 66 | V_FUNCTION_END(__kernel_get_syscall_map) | |
| a7f290da BH |
67 | |
| 68 | /* | |
| 69 | * void unsigned long long __kernel_get_tbfreq(void); | |
| 70 | * | |
| 71 | * returns the timebase frequency in HZ | |
| 72 | */ | |
| 73 | V_FUNCTION_BEGIN(__kernel_get_tbfreq) | |
| 74 | .cfi_startproc | |
| 75 | mflr r12 | |
| 76 | .cfi_register lr,r12 | |
| 77 | bl __get_datapage@local | |
| a7f290da | 78 | lwz r4,(CFG_TB_TICKS_PER_SEC + 4)(r3) |
| 0c37ec2a | 79 | lwz r3,CFG_TB_TICKS_PER_SEC(r3) |
| a7f290da | 80 | mtlr r12 |
| 5d66da3d | 81 | crclr cr0*4+so |
| 0c37ec2a | 82 | blr |
| a7f290da BH |
83 | .cfi_endproc |
| 84 | V_FUNCTION_END(__kernel_get_tbfreq) |