1/* 2 * linux/arch/arm/mm/tlbv4wb.S 3 * 4 * Copyright (C) 1997-2002 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * ARM architecture version 4 TLB handling functions. 11 * These assume a split I/D TLBs w/o I TLB entry, with a write buffer. 12 * 13 * Processors: SA110 SA1100 SA1110 14 */ 15#include <linux/linkage.h> 16#include <linux/init.h> 17#include <asm/assembler.h> 18#include <asm/asm-offsets.h> 19#include <asm/tlbflush.h> 20#include "proc-macros.S" 21 22 .align 5 23/* 24 * v4wb_flush_user_tlb_range(start, end, mm) 25 * 26 * Invalidate a range of TLB entries in the specified address space. 27 * 28 * - start - range start address 29 * - end - range end address 30 * - mm - mm_struct describing address space 31 */ 32 .align 5 33ENTRY(v4wb_flush_user_tlb_range) 34 vma_vm_mm ip, r2 35 act_mm r3 @ get current->active_mm 36 eors r3, ip, r3 @ == mm ? 37 retne lr @ no, we dont do anything 38 vma_vm_flags r2, r2 39 mcr p15, 0, r3, c7, c10, 4 @ drain WB 40 tst r2, #VM_EXEC 41 mcrne p15, 0, r3, c8, c5, 0 @ invalidate I TLB 42 bic r0, r0, #0x0ff 43 bic r0, r0, #0xf00 441: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 45 add r0, r0, #PAGE_SZ 46 cmp r0, r1 47 blo 1b 48 ret lr 49 50/* 51 * v4_flush_kern_tlb_range(start, end) 52 * 53 * Invalidate a range of TLB entries in the specified kernel 54 * address range. 55 * 56 * - start - virtual address (may not be aligned) 57 * - end - virtual address (may not be aligned) 58 */ 59ENTRY(v4wb_flush_kern_tlb_range) 60 mov r3, #0 61 mcr p15, 0, r3, c7, c10, 4 @ drain WB 62 bic r0, r0, #0x0ff 63 bic r0, r0, #0xf00 64 mcr p15, 0, r3, c8, c5, 0 @ invalidate I TLB 651: mcr p15, 0, r0, c8, c6, 1 @ invalidate D TLB entry 66 add r0, r0, #PAGE_SZ 67 cmp r0, r1 68 blo 1b 69 ret lr 70 71 __INITDATA 72 73 /* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */ 74 define_tlb_functions v4wb, v4wb_tlb_flags 75