| Paulius Zaleckas | 28853ac | 2009-03-25 13:10:01 +0200 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/mm/tlb-fa.S |
| 3 | * |
| 4 | * Copyright (C) 2005 Faraday Corp. |
| 5 | * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> |
| 6 | * |
| 7 | * Based on tlb-v4wbi.S: |
| 8 | * Copyright (C) 1997-2002 Russell King |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | * |
| 14 | * ARM architecture version 4, Faraday variation. |
| 15 | * This assume an unified TLBs, with a write buffer, and branch target buffer (BTB) |
| 16 | * |
| 17 | * Processors: FA520 FA526 FA626 |
| 18 | */ |
| 19 | #include <linux/linkage.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <asm/asm-offsets.h> |
| 22 | #include <asm/tlbflush.h> |
| 23 | #include "proc-macros.S" |
| 24 | |
| 25 | |
| 26 | /* |
| 27 | * flush_user_tlb_range(start, end, mm) |
| 28 | * |
| 29 | * Invalidate a range of TLB entries in the specified address space. |
| 30 | * |
| 31 | * - start - range start address |
| 32 | * - end - range end address |
| 33 | * - mm - mm_struct describing address space |
| 34 | */ |
| 35 | .align 4 |
| 36 | ENTRY(fa_flush_user_tlb_range) |
| 37 | vma_vm_mm ip, r2 |
| 38 | act_mm r3 @ get current->active_mm |
| 39 | eors r3, ip, r3 @ == mm ? |
| 40 | movne pc, lr @ no, we dont do anything |
| 41 | mov r3, #0 |
| 42 | mcr p15, 0, r3, c7, c10, 4 @ drain WB |
| 43 | bic r0, r0, #0x0ff |
| 44 | bic r0, r0, #0xf00 |
| 45 | 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry |
| 46 | add r0, r0, #PAGE_SZ |
| 47 | cmp r0, r1 |
| 48 | blo 1b |
| 49 | mcr p15, 0, r3, c7, c5, 6 @ invalidate BTB |
| 50 | mcr p15, 0, r3, c7, c10, 4 @ data write barrier |
| 51 | mov pc, lr |
| 52 | |
| 53 | |
| 54 | ENTRY(fa_flush_kern_tlb_range) |
| 55 | mov r3, #0 |
| 56 | mcr p15, 0, r3, c7, c10, 4 @ drain WB |
| 57 | bic r0, r0, #0x0ff |
| 58 | bic r0, r0, #0xf00 |
| 59 | 1: mcr p15, 0, r0, c8, c7, 1 @ invalidate UTLB entry |
| 60 | add r0, r0, #PAGE_SZ |
| 61 | cmp r0, r1 |
| 62 | blo 1b |
| 63 | mcr p15, 0, r3, c7, c5, 6 @ invalidate BTB |
| 64 | mcr p15, 0, r3, c7, c10, 4 @ data write barrier |
| 65 | mcr p15, 0, r3, c7, c5, 4 @ prefetch flush |
| 66 | mov pc, lr |
| 67 | |
| 68 | __INITDATA |
| 69 | |
| 70 | .type fa_tlb_fns, #object |
| 71 | ENTRY(fa_tlb_fns) |
| 72 | .long fa_flush_user_tlb_range |
| 73 | .long fa_flush_kern_tlb_range |
| 74 | .long fa_tlb_flags |
| 75 | .size fa_tlb_fns, . - fa_tlb_fns |