/* * linux/arch/arm/mm/copypage-xsc3.S * * Copyright (C) 2004 Intel Corp. * * 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. * * Adapted for 3rd gen XScale core, no more mini-dcache * Author: Matt Gilbert (matthew.m.gilbert@intel.com) */ #include <linux/init.h> #include <linux/highmem.h> /* * General note: * We don't really want write-allocate cache behaviour for these functions * since that will just eat through 8K of the cache. */ /* * XSC3 optimised copy_user_highpage * r0 = destination * r1 = source * * The source page may have some clean entries in the cache already, but we * can safely ignore them - break_cow() will flush them out of the cache * if we eventually end up using our copied page. * */ static void __naked xsc3_mc_copy_user_page(void *kto, const void *kfrom) { asm("\ stmfd sp!, {r4, r5, lr} \n\ mov lr, %2 \n\ \n\ pld [r1, #0] \n\ pld [r1, #32] \n\ 1: pld [r1, #64] \n\ pld [r1, #96] \n\ \n\ 2: ldrd r2, [r1], #8 \n\ mov ip, r0 \n\ ldrd r4, [r1], #8 \n\ mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\ strd r2, [r0], #8 \n\ ldrd r2, [r1], #8 \n\ strd r4, [r0], #8 \n\ ldrd r4, [r1], #8 \n\ strd r2, [r0], #8 \n\ strd r4, [r0], #8 \n\ ldrd r2, [r1], #8 \n\ mov ip, r0 \n\ ldrd r4, [r1], #8 \n\ mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\ strd r2, [r0], #8 \n\ ldrd r2, [r1], #8 \n\ subs lr, lr, #1 \n\ strd r4, [r0], #8 \n\ ldrd r4, [r1], #8 \n\ strd r2, [r0], #8 \n\ strd r4, [r0], #8 \n\ bgt 1b \n\ beq 2b \n\ \n\ ldmfd sp!, {r4, r5, pc}" : : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1)); } void xsc3_mc_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)); xsc3_mc_copy_user_page(kto, kfrom); kunmap_atomic(kfrom, KM_USER1); kunmap_atomic(kto, KM_USER0); } /* * XScale optimised clear_user_page * r0 = destination * r1 = virtual user address of ultimate destination page */ void xsc3_mc_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\ 1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\ strd r2, [%0], #8 \n\ strd r2, [%0], #8 \n\ strd r2, [%0], #8 \n\ strd r2, [%0], #8 \n\ subs r1, r1, #1 \n\ bne 1b" : "=r" (ptr) : "0" (kaddr), "I" (PAGE_SIZE / 32) : "r1", "r2", "r3"); kunmap_atomic(kaddr, KM_USER0); } struct cpu_user_fns xsc3_mc_user_fns __initdata = { .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage, .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage, };