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/* * linux/arch/arm/lib/copypage-fa.S * * Copyright (C) 2005 Faraday Corp. * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt> * * Based on copypage-v4wb.S: * Copyright (C) 1995-1999 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/init.h> #include <linux/highmem.h> /* * Faraday optimised copy_user_page */ static void __naked fa_copy_user_page(void *kto, const void *kfrom) { asm("\ stmfd sp!, {r4, lr} @ 2\n\ mov r2, %0 @ 1\n\ 1: ldmia r1!, {r3, r4, ip, lr} @ 4\n\ stmia r0, {r3, r4, ip, lr} @ 4\n\ mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ add r0, r0, #16 @ 1\n\ ldmia r1!, {r3, r4, ip, lr} @ 4\n\ stmia r0, {r3, r4, ip, lr} @ 4\n\ mcr p15, 0, r0, c7, c14, 1 @ 1 clean and invalidate D line\n\ add r0, r0, #16 @ 1\n\ subs r2, r2, #1 @ 1\n\ bne 1b @ 1\n\ mcr p15, 0, r2, c7, c10, 4 @ 1 drain WB\n\ ldmfd sp!, {r4, pc} @ 3" : : "I" (PAGE_SIZE / 32)); } void fa_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { void *kto, *kfrom; kto = kmap_atomic(to); kfrom = kmap_atomic(from); fa_copy_user_page(kto, kfrom); kunmap_atomic(kfrom); kunmap_atomic(kto); } /* * Faraday optimised clear_user_page * * Same story as above. */ void fa_clear_user_highpage(struct page *page, unsigned long vaddr) { void *ptr, *kaddr = kmap_atomic(page); asm volatile("\ mov r1, %2 @ 1\n\ mov r2, #0 @ 1\n\ mov r3, #0 @ 1\n\ mov ip, #0 @ 1\n\ mov lr, #0 @ 1\n\ 1: stmia %0, {r2, r3, ip, lr} @ 4\n\ mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ add %0, %0, #16 @ 1\n\ stmia %0, {r2, r3, ip, lr} @ 4\n\ mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\ add %0, %0, #16 @ 1\n\ subs r1, r1, #1 @ 1\n\ bne 1b @ 1\n\ mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB" : "=r" (ptr) : "0" (kaddr), "I" (PAGE_SIZE / 32) : "r1", "r2", "r3", "ip", "lr"); kunmap_atomic(kaddr); } struct cpu_user_fns fa_user_fns __initdata = { .cpu_clear_user_highpage = fa_clear_user_highpage, .cpu_copy_user_highpage = fa_copy_user_highpage, }; |