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| // SPDX-License-Identifier: GPL-2.0-only
| /*
| * linux/arch/arm/mm/copypage-xsc3.S
| *
| * Copyright (C) 2004 Intel Corp.
| *
| * 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
| *
| * 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 xsc3_mc_copy_user_page(void *kto, const void *kfrom)
| {
| int tmp;
|
| asm volatile ("\
| pld [%1, #0] \n\
| pld [%1, #32] \n\
| 1: pld [%1, #64] \n\
| pld [%1, #96] \n\
| \n\
| 2: ldrd r2, r3, [%1], #8 \n\
| ldrd r4, r5, [%1], #8 \n\
| mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
| strd r2, r3, [%0], #8 \n\
| ldrd r2, r3, [%1], #8 \n\
| strd r4, r5, [%0], #8 \n\
| ldrd r4, r5, [%1], #8 \n\
| strd r2, r3, [%0], #8 \n\
| strd r4, r5, [%0], #8 \n\
| ldrd r2, r3, [%1], #8 \n\
| ldrd r4, r5, [%1], #8 \n\
| mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
| strd r2, r3, [%0], #8 \n\
| ldrd r2, r3, [%1], #8 \n\
| subs %2, %2, #1 \n\
| strd r4, r5, [%0], #8 \n\
| ldrd r4, r5, [%1], #8 \n\
| strd r2, r3, [%0], #8 \n\
| strd r4, r5, [%0], #8 \n\
| bgt 1b \n\
| beq 2b "
| : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
| : "2" (PAGE_SIZE / 64 - 1)
| : "r2", "r3", "r4", "r5");
| }
|
| 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);
| kfrom = kmap_atomic(from);
| flush_cache_page(vma, vaddr, page_to_pfn(from));
| xsc3_mc_copy_user_page(kto, kfrom);
| kunmap_atomic(kfrom);
| kunmap_atomic(kto);
| }
|
| /*
| * XScale optimised clear_user_page
| */
| void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
| {
| void *ptr, *kaddr = kmap_atomic(page);
| 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, r3, [%0], #8 \n\
| strd r2, r3, [%0], #8 \n\
| strd r2, r3, [%0], #8 \n\
| strd r2, r3, [%0], #8 \n\
| subs r1, r1, #1 \n\
| bne 1b"
| : "=r" (ptr)
| : "0" (kaddr), "I" (PAGE_SIZE / 32)
| : "r1", "r2", "r3");
| kunmap_atomic(kaddr);
| }
|
| 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,
| };
|
|
