| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * vDSO provided cache flush routines |
| * |
| * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org), |
| * IBM Corp. |
| */ |
| #include <asm/processor.h> |
| #include <asm/ppc_asm.h> |
| #include <asm/vdso.h> |
| #include <asm/vdso_datapage.h> |
| #include <asm/asm-offsets.h> |
| |
| .text |
| |
| /* |
| * Default "generic" version of __kernel_sync_dicache. |
| * |
| * void __kernel_sync_dicache(unsigned long start, unsigned long end) |
| * |
| * Flushes the data cache & invalidate the instruction cache for the |
| * provided range [start, end[ |
| */ |
| V_FUNCTION_BEGIN(__kernel_sync_dicache) |
| .cfi_startproc |
| BEGIN_FTR_SECTION |
| b 3f |
| END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE) |
| mflr r12 |
| .cfi_register lr,r12 |
| get_datapage r10 |
| mtlr r12 |
| .cfi_restore lr |
| |
| lwz r7,CFG_DCACHE_BLOCKSZ(r10) |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 /* ensure we get enough */ |
| lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10) |
| srd. r8,r8,r9 /* compute line count */ |
| crclr cr0*4+so |
| beqlr /* nothing to do? */ |
| mtctr r8 |
| 1: dcbst 0,r6 |
| add r6,r6,r7 |
| bdnz 1b |
| sync |
| |
| /* Now invalidate the instruction cache */ |
| |
| lwz r7,CFG_ICACHE_BLOCKSZ(r10) |
| addi r5,r7,-1 |
| andc r6,r3,r5 /* round low to line bdy */ |
| subf r8,r6,r4 /* compute length */ |
| add r8,r8,r5 |
| lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10) |
| srd. r8,r8,r9 /* compute line count */ |
| crclr cr0*4+so |
| beqlr /* nothing to do? */ |
| mtctr r8 |
| 2: icbi 0,r6 |
| add r6,r6,r7 |
| bdnz 2b |
| isync |
| li r3,0 |
| blr |
| 3: |
| crclr cr0*4+so |
| sync |
| isync |
| li r3,0 |
| blr |
| .cfi_endproc |
| V_FUNCTION_END(__kernel_sync_dicache) |
