12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182 |
- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * linux/arch/arm/lib/copypage-fa.S
- *
- * Copyright (C) 2005 Faraday Corp.
- * Copyright (C) 2008-2009 Paulius Zaleckas <[email protected]>
- *
- * Based on copypage-v4wb.S:
- * Copyright (C) 1995-1999 Russell King
- */
- #include <linux/init.h>
- #include <linux/highmem.h>
- /*
- * Faraday optimised copy_user_page
- */
- static void fa_copy_user_page(void *kto, const void *kfrom)
- {
- int tmp;
- asm volatile ("\
- 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\
- stmia %0, {r3, r4, ip, lr} @ 4\n\
- mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
- add %0, %0, #16 @ 1\n\
- ldmia %1!, {r3, r4, ip, lr} @ 4\n\
- stmia %0, {r3, r4, 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 %2, %2, #1 @ 1\n\
- bne 1b @ 1\n\
- mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB"
- : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
- : "2" (PAGE_SIZE / 32)
- : "r3", "r4", "ip", "lr");
- }
- 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,
- };
|