/* * linux/arch/arm/mm/copypage-feroceon.S * * Copyright (C) 2008 Marvell Semiconductors * * 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. * * This handles copy_user_highpage and clear_user_page on Feroceon * more optimally than the generic implementations. */ #include <linux/init.h> #include <linux/highmem.h> static void __naked feroceon_copy_user_page(void *kto, const void *kfrom) { asm("\ stmfd sp!, {r4-r9, lr} \n\ mov ip, %2 \n\ 1: mov lr, r1 \n\ ldmia r1!, {r2 - r9} \n\ pld [lr, #32] \n\ pld [lr, #64] \n\ pld [lr, #96] \n\ pld [lr, #128] \n\ pld [lr, #160] \n\ pld [lr, #192] \n\ pld [lr, #224] \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ ldmia r1!, {r2 - r9} \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ stmia r0, {r2 - r9} \n\ subs ip, ip, #(32 * 8) \n\ mcr p15, 0, r0, c7, c14, 1 @ clean and invalidate D line\n\ add r0, r0, #32 \n\ bne 1b \n\ mcr p15, 0, ip, c7, c10, 4 @ drain WB\n\ ldmfd sp!, {r4-r9, pc}" : : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE)); } void feroceon_copy_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { void *kto, *kfrom; kto = kmap_atomic(to, KM_USER0); kfrom = kmap_atomic(from, KM_USER1); flush_cache_page(vma, vaddr, page_to_pfn(from)); feroceon_copy_user_page(kto, kfrom); kunmap_atomic(kfrom, KM_USER1); kunmap_atomic(kto, KM_USER0); } void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr) { void *ptr, *kaddr = kmap_atomic(page, KM_USER0); asm volatile ("\ mov r1, %2 \n\ mov r2, #0 \n\ mov r3, #0 \n\ mov r4, #0 \n\ mov r5, #0 \n\ mov r6, #0 \n\ mov r7, #0 \n\ mov ip, #0 \n\ mov lr, #0 \n\ 1: stmia %0, {r2-r7, ip, lr} \n\ subs r1, r1, #1 \n\ mcr p15, 0, %0, c7, c14, 1 @ clean and invalidate D line\n\ add %0, %0, #32 \n\ bne 1b \n\ mcr p15, 0, r1, c7, c10, 4 @ drain WB" : "=r" (ptr) : "0" (kaddr), "I" (PAGE_SIZE / 32) : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr"); kunmap_atomic(kaddr, KM_USER0); } struct cpu_user_fns feroceon_user_fns __initdata = { .cpu_clear_user_highpage = feroceon_clear_user_highpage, .cpu_copy_user_highpage = feroceon_copy_user_highpage, };