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 */ 37ENTRY(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] 431: pld [r1, #64] 44 pld [r1, #96] 45 462: 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 */ 78ENTRY(xsc3_mc_clear_user_page) 79 mov r1, #PAGE_SZ/32 80 mov r2, #0 81 mov r3, #0 821: 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 94ENTRY(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 98