1 /* 2 * linux/arch/arm/mm/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 #include <linux/init.h> 14 #include <linux/highmem.h> 15 16 /* 17 * General note: 18 * We don't really want write-allocate cache behaviour for these functions 19 * since that will just eat through 8K of the cache. 20 */ 21 22 /* 23 * XSC3 optimised copy_user_highpage 24 * 25 * The source page may have some clean entries in the cache already, but we 26 * can safely ignore them - break_cow() will flush them out of the cache 27 * if we eventually end up using our copied page. 28 * 29 */ 30 static void xsc3_mc_copy_user_page(void *kto, const void *kfrom) 31 { 32 int tmp; 33 34 asm volatile ("\ 35 pld [%1, #0] \n\ 36 pld [%1, #32] \n\ 37 1: pld [%1, #64] \n\ 38 pld [%1, #96] \n\ 39 \n\ 40 2: ldrd r2, r3, [%1], #8 \n\ 41 ldrd r4, r5, [%1], #8 \n\ 42 mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ 43 strd r2, r3, [%0], #8 \n\ 44 ldrd r2, r3, [%1], #8 \n\ 45 strd r4, r5, [%0], #8 \n\ 46 ldrd r4, r5, [%1], #8 \n\ 47 strd r2, r3, [%0], #8 \n\ 48 strd r4, r5, [%0], #8 \n\ 49 ldrd r2, r3, [%1], #8 \n\ 50 ldrd r4, r5, [%1], #8 \n\ 51 mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ 52 strd r2, r3, [%0], #8 \n\ 53 ldrd r2, r3, [%1], #8 \n\ 54 subs %2, %2, #1 \n\ 55 strd r4, r5, [%0], #8 \n\ 56 ldrd r4, r5, [%1], #8 \n\ 57 strd r2, r3, [%0], #8 \n\ 58 strd r4, r5, [%0], #8 \n\ 59 bgt 1b \n\ 60 beq 2b " 61 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) 62 : "2" (PAGE_SIZE / 64 - 1) 63 : "r2", "r3", "r4", "r5"); 64 } 65 66 void xsc3_mc_copy_user_highpage(struct page *to, struct page *from, 67 unsigned long vaddr, struct vm_area_struct *vma) 68 { 69 void *kto, *kfrom; 70 71 kto = kmap_atomic(to); 72 kfrom = kmap_atomic(from); 73 flush_cache_page(vma, vaddr, page_to_pfn(from)); 74 xsc3_mc_copy_user_page(kto, kfrom); 75 kunmap_atomic(kfrom); 76 kunmap_atomic(kto); 77 } 78 79 /* 80 * XScale optimised clear_user_page 81 */ 82 void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr) 83 { 84 void *ptr, *kaddr = kmap_atomic(page); 85 asm volatile ("\ 86 mov r1, %2 \n\ 87 mov r2, #0 \n\ 88 mov r3, #0 \n\ 89 1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\ 90 strd r2, r3, [%0], #8 \n\ 91 strd r2, r3, [%0], #8 \n\ 92 strd r2, r3, [%0], #8 \n\ 93 strd r2, r3, [%0], #8 \n\ 94 subs r1, r1, #1 \n\ 95 bne 1b" 96 : "=r" (ptr) 97 : "0" (kaddr), "I" (PAGE_SIZE / 32) 98 : "r1", "r2", "r3"); 99 kunmap_atomic(kaddr); 100 } 101 102 struct cpu_user_fns xsc3_mc_user_fns __initdata = { 103 .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage, 104 .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage, 105 }; 106