| Lennert Buytenhek | 23bdf86 | 2006-03-28 21:00:40 +0100 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/lib/copypage-xsc3.S |
| 3 | * |
| 4 | * Copyright (C) 2004 Intel Corp. |
| 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 | * Adapted for 3rd gen XScale core, no more mini-dcache |
| 11 | * Author: Matt Gilbert (matthew.m.gilbert@intel.com) |
| 12 | */ |
| 13 | |
| 14 | #include <linux/linkage.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <asm/asm-offsets.h> |
| 17 | |
| 18 | /* |
| 19 | * General note: |
| 20 | * We don't really want write-allocate cache behaviour for these functions |
| 21 | * since that will just eat through 8K of the cache. |
| 22 | */ |
| 23 | |
| 24 | .text |
| 25 | .align 5 |
| 26 | /* |
| 27 | * XSC3 optimised copy_user_page |
| 28 | * r0 = destination |
| 29 | * r1 = source |
| 30 | * r2 = virtual user address of ultimate destination page |
| 31 | * |
| 32 | * The source page may have some clean entries in the cache already, but we |
| 33 | * can safely ignore them - break_cow() will flush them out of the cache |
| 34 | * if we eventually end up using our copied page. |
| 35 | * |
| 36 | */ |
| 37 | ENTRY(xsc3_mc_copy_user_page) |
| 38 | stmfd sp!, {r4, r5, lr} |
| 39 | mov lr, #PAGE_SZ/64-1 |
| 40 | |
| 41 | pld [r1, #0] |
| 42 | pld [r1, #32] |
| 43 | 1: pld [r1, #64] |
| 44 | pld [r1, #96] |
| 45 | |
| 46 | 2: ldrd r2, [r1], #8 |
| 47 | mov ip, r0 |
| 48 | ldrd r4, [r1], #8 |
| 49 | mcr p15, 0, ip, c7, c6, 1 @ invalidate |
| 50 | strd r2, [r0], #8 |
| 51 | ldrd r2, [r1], #8 |
| 52 | strd r4, [r0], #8 |
| 53 | ldrd r4, [r1], #8 |
| 54 | strd r2, [r0], #8 |
| 55 | strd r4, [r0], #8 |
| 56 | ldrd r2, [r1], #8 |
| 57 | mov ip, r0 |
| 58 | ldrd r4, [r1], #8 |
| 59 | mcr p15, 0, ip, c7, c6, 1 @ invalidate |
| 60 | strd r2, [r0], #8 |
| 61 | ldrd r2, [r1], #8 |
| 62 | subs lr, lr, #1 |
| 63 | strd r4, [r0], #8 |
| 64 | ldrd r4, [r1], #8 |
| 65 | strd r2, [r0], #8 |
| 66 | strd r4, [r0], #8 |
| 67 | bgt 1b |
| 68 | beq 2b |
| 69 | |
| 70 | ldmfd sp!, {r4, r5, pc} |
| 71 | |
| 72 | .align 5 |
| 73 | /* |
| 74 | * XScale optimised clear_user_page |
| 75 | * r0 = destination |
| 76 | * r1 = virtual user address of ultimate destination page |
| 77 | */ |
| 78 | ENTRY(xsc3_mc_clear_user_page) |
| 79 | mov r1, #PAGE_SZ/32 |
| 80 | mov r2, #0 |
| 81 | mov r3, #0 |
| 82 | 1: mcr p15, 0, r0, c7, c6, 1 @ invalidate line |
| 83 | strd r2, [r0], #8 |
| 84 | strd r2, [r0], #8 |
| 85 | strd r2, [r0], #8 |
| 86 | strd r2, [r0], #8 |
| 87 | subs r1, r1, #1 |
| 88 | bne 1b |
| 89 | mov pc, lr |
| 90 | |
| 91 | __INITDATA |
| 92 | |
| 93 | .type xsc3_mc_user_fns, #object |
| 94 | ENTRY(xsc3_mc_user_fns) |
| 95 | .long xsc3_mc_clear_user_page |
| 96 | .long xsc3_mc_copy_user_page |
| 97 | .size xsc3_mc_user_fns, . - xsc3_mc_user_fns |