1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * linux/arch/arm/mm/tlbv4wb.S 4 * 5 * Copyright (C) 1997-2002 Russell King 6 * 7 * ARM architecture version 4 TLB handling functions. 8 * These assume a split I/D TLBs w/o I TLB entry, with a write buffer. 9 * 10 * Processors: SA110 SA1100 SA1110 11 */ 12 #include <linux/linkage.h> 13 #include <linux/init.h> 14 #include <linux/cfi_types.h> 15 #include <asm/assembler.h> 16 #include <asm/asm-offsets.h> 17 #include <asm/tlbflush.h> 18 #include "proc-macros.S" 19 20 .align 5 21 /* 22 * v4wb_flush_user_tlb_range(start, end, mm) 23 * 24 * Invalidate a range of TLB entries in the specified address space. 25 * 26 * - start - range start address 27 * - end - range end address 28 * - mm - mm_struct describing address space 29 */ 30 .align 5 31 SYM_TYPED_FUNC_START(v4wb_flush_user_tlb_range) 32 vma_vm_mm ip, r2 33 act_mm r3 @ get current->active_mm 34 eors r3, ip, r3 @ == mm ? 35 retne lr @ no, we dont do anything 36 vma_vm_flags r2, r2 37 mcr p15, 0, r3, c7, c10, 4 @ drain WB 38 tst r2, #VM_EXEC 39 mcrne p15, 0, r3, c8, c5, 0 @ invalidate I TLB 40 bic r0, r0, #0x0ff 41 bic r0, r0, #0xf00 42 1: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 43 add r0, r0, #PAGE_SZ 44 cmp r0, r1 45 blo 1b 46 ret lr 47 SYM_FUNC_END(v4wb_flush_user_tlb_range) 48 49 /* 50 * v4_flush_kern_tlb_range(start, end) 51 * 52 * Invalidate a range of TLB entries in the specified kernel 53 * address range. 54 * 55 * - start - virtual address (may not be aligned) 56 * - end - virtual address (may not be aligned) 57 */ 58 SYM_TYPED_FUNC_START(v4wb_flush_kern_tlb_range) 59 mov r3, #0 60 mcr p15, 0, r3, c7, c10, 4 @ drain WB 61 bic r0, r0, #0x0ff 62 bic r0, r0, #0xf00 63 mcr p15, 0, r3, c8, c5, 0 @ invalidate I TLB 64 1: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 65 add r0, r0, #PAGE_SZ 66 cmp r0, r1 67 blo 1b 68 ret lr 69 SYM_FUNC_END(v4wb_flush_kern_tlb_range)
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