1/* 2 * linux/arch/arm/mm/copypage-v3.c 3 * 4 * Copyright (C) 1995-1999 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#include <linux/init.h> 11#include <linux/highmem.h> 12 13static void __naked 14v3_copy_user_page(void *kto, const void *kfrom) 15{ 16 asm("\n\ 17 stmfd sp!, {r4, lr} @ 2\n\ 18 mov r2, %2 @ 1\n\ 19 ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ 201: stmia %1!, {r3, r4, ip, lr} @ 4\n\ 21 ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ 22 stmia %1!, {r3, r4, ip, lr} @ 4\n\ 23 ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\ 24 stmia %1!, {r3, r4, ip, lr} @ 4\n\ 25 ldmia %0!, {r3, r4, ip, lr} @ 4\n\ 26 subs r2, r2, #1 @ 1\n\ 27 stmia %1!, {r3, r4, ip, lr} @ 4\n\ 28 ldmneia %0!, {r3, r4, ip, lr} @ 4\n\ 29 bne 1b @ 1\n\ 30 ldmfd sp!, {r4, pc} @ 3" 31 : 32 : "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64)); 33} 34 35void v3_copy_user_highpage(struct page *to, struct page *from, 36 unsigned long vaddr, struct vm_area_struct *vma) 37{ 38 void *kto, *kfrom; 39 40 kto = kmap_atomic(to, KM_USER0); 41 kfrom = kmap_atomic(from, KM_USER1); 42 v3_copy_user_page(kto, kfrom); 43 kunmap_atomic(kfrom, KM_USER1); 44 kunmap_atomic(kto, KM_USER0); 45} 46 47void v3_clear_user_highpage(struct page *page, unsigned long vaddr) 48{ 49 void *ptr, *kaddr = kmap_atomic(page, KM_USER0); 50 asm volatile("\n\ 51 mov r1, %2 @ 1\n\ 52 mov r2, #0 @ 1\n\ 53 mov r3, #0 @ 1\n\ 54 mov ip, #0 @ 1\n\ 55 mov lr, #0 @ 1\n\ 561: stmia %0!, {r2, r3, ip, lr} @ 4\n\ 57 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 58 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 59 stmia %0!, {r2, r3, ip, lr} @ 4\n\ 60 subs r1, r1, #1 @ 1\n\ 61 bne 1b @ 1" 62 : "=r" (ptr) 63 : "0" (kaddr), "I" (PAGE_SIZE / 64) 64 : "r1", "r2", "r3", "ip", "lr"); 65 kunmap_atomic(kaddr, KM_USER0); 66} 67 68struct cpu_user_fns v3_user_fns __initdata = { 69 .cpu_clear_user_highpage = v3_clear_user_highpage, 70 .cpu_copy_user_highpage = v3_copy_user_highpage, 71}; 72