| 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 2 | /* |
| 3 | * vDSO provided cache flush routines |
| 4 | * |
| 5 | * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), |
| 6 | * IBM Corp. |
| 7 | */ |
| 8 | #include <asm/processor.h> |
| 9 | #include <asm/ppc_asm.h> |
| 10 | #include <asm/vdso.h> |
| 11 | #include <asm/vdso_datapage.h> |
| 12 | #include <asm/asm-offsets.h> |
| 13 | #include <asm/cache.h> |
| 14 | |
| 15 | .text |
| 16 | |
| 17 | /* |
| 18 | * Default "generic" version of __kernel_sync_dicache. |
| 19 | * |
| 20 | * void __kernel_sync_dicache(unsigned long start, unsigned long end) |
| 21 | * |
| 22 | * Flushes the data cache & invalidate the instruction cache for the |
| 23 | * provided range [start, end[ |
| 24 | */ |
| 25 | V_FUNCTION_BEGIN(__kernel_sync_dicache) |
| 26 | .cfi_startproc |
| 27 | BEGIN_FTR_SECTION |
| 28 | b 3f |
| 29 | END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) |
| 30 | #ifdef CONFIG_PPC64 |
| 31 | mflr r12 |
| 32 | .cfi_register lr,r12 |
| 33 | get_datapage r10 vdso_u_arch_data |
| 34 | mtlr r12 |
| 35 | .cfi_restore lr |
| 36 | #endif |
| 37 | |
| 38 | #ifdef CONFIG_PPC64 |
| 39 | lwz r7,CFG_DCACHE_BLOCKSZ(r10) |
| 40 | addi r5,r7,-1 |
| 41 | #else |
| 42 | li r5, L1_CACHE_BYTES - 1 |
| 43 | #endif |
| 44 | andc r6,r3,r5 /* round low to line bdy */ |
| 45 | subf r8,r6,r4 /* compute length */ |
| 46 | add r8,r8,r5 /* ensure we get enough */ |
| 47 | #ifdef CONFIG_PPC64 |
| 48 | lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10) |
| 49 | PPC_SRL. r8,r8,r9 /* compute line count */ |
| 50 | #else |
| 51 | srwi. r8, r8, L1_CACHE_SHIFT |
| 52 | mr r7, r6 |
| 53 | #endif |
| 54 | crclr cr0*4+so |
| 55 | beqlr /* nothing to do? */ |
| 56 | mtctr r8 |
| 57 | 1: dcbst 0,r6 |
| 58 | #ifdef CONFIG_PPC64 |
| 59 | add r6,r6,r7 |
| 60 | #else |
| 61 | addi r6, r6, L1_CACHE_BYTES |
| 62 | #endif |
| 63 | bdnz 1b |
| 64 | sync |
| 65 | |
| 66 | /* Now invalidate the instruction cache */ |
| 67 | |
| 68 | #ifdef CONFIG_PPC64 |
| 69 | lwz r7,CFG_ICACHE_BLOCKSZ(r10) |
| 70 | addi r5,r7,-1 |
| 71 | andc r6,r3,r5 /* round low to line bdy */ |
| 72 | subf r8,r6,r4 /* compute length */ |
| 73 | add r8,r8,r5 |
| 74 | lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10) |
| 75 | PPC_SRL. r8,r8,r9 /* compute line count */ |
| 76 | crclr cr0*4+so |
| 77 | beqlr /* nothing to do? */ |
| 78 | #endif |
| 79 | mtctr r8 |
| 80 | #ifdef CONFIG_PPC64 |
| 81 | 2: icbi 0,r6 |
| 82 | add r6,r6,r7 |
| 83 | #else |
| 84 | 2: icbi 0, r7 |
| 85 | addi r7, r7, L1_CACHE_BYTES |
| 86 | #endif |
| 87 | bdnz 2b |
| 88 | isync |
| 89 | li r3,0 |
| 90 | blr |
| 91 | 3: |
| 92 | crclr cr0*4+so |
| 93 | sync |
| 94 | icbi 0,r1 |
| 95 | isync |
| 96 | li r3,0 |
| 97 | blr |
| 98 | .cfi_endproc |
| 99 | V_FUNCTION_END(__kernel_sync_dicache) |
| 100 | |