1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-only
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * linux/arch/arm/lib/copypage-fa.S
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright (C) 2005 Faraday Corp.
6*4882a593Smuzhiyun * Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
7*4882a593Smuzhiyun *
8*4882a593Smuzhiyun * Based on copypage-v4wb.S:
9*4882a593Smuzhiyun * Copyright (C) 1995-1999 Russell King
10*4882a593Smuzhiyun */
11*4882a593Smuzhiyun #include <linux/init.h>
12*4882a593Smuzhiyun #include <linux/highmem.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun /*
15*4882a593Smuzhiyun * Faraday optimised copy_user_page
16*4882a593Smuzhiyun */
fa_copy_user_page(void * kto,const void * kfrom)17*4882a593Smuzhiyun static void fa_copy_user_page(void *kto, const void *kfrom)
18*4882a593Smuzhiyun {
19*4882a593Smuzhiyun int tmp;
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun asm volatile ("\
22*4882a593Smuzhiyun 1: ldmia %1!, {r3, r4, ip, lr} @ 4\n\
23*4882a593Smuzhiyun stmia %0, {r3, r4, ip, lr} @ 4\n\
24*4882a593Smuzhiyun mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
25*4882a593Smuzhiyun add %0, %0, #16 @ 1\n\
26*4882a593Smuzhiyun ldmia %1!, {r3, r4, ip, lr} @ 4\n\
27*4882a593Smuzhiyun stmia %0, {r3, r4, ip, lr} @ 4\n\
28*4882a593Smuzhiyun mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
29*4882a593Smuzhiyun add %0, %0, #16 @ 1\n\
30*4882a593Smuzhiyun subs %2, %2, #1 @ 1\n\
31*4882a593Smuzhiyun bne 1b @ 1\n\
32*4882a593Smuzhiyun mcr p15, 0, %2, c7, c10, 4 @ 1 drain WB"
33*4882a593Smuzhiyun : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
34*4882a593Smuzhiyun : "2" (PAGE_SIZE / 32)
35*4882a593Smuzhiyun : "r3", "r4", "ip", "lr");
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
fa_copy_user_highpage(struct page * to,struct page * from,unsigned long vaddr,struct vm_area_struct * vma)38*4882a593Smuzhiyun void fa_copy_user_highpage(struct page *to, struct page *from,
39*4882a593Smuzhiyun unsigned long vaddr, struct vm_area_struct *vma)
40*4882a593Smuzhiyun {
41*4882a593Smuzhiyun void *kto, *kfrom;
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun kto = kmap_atomic(to);
44*4882a593Smuzhiyun kfrom = kmap_atomic(from);
45*4882a593Smuzhiyun fa_copy_user_page(kto, kfrom);
46*4882a593Smuzhiyun kunmap_atomic(kfrom);
47*4882a593Smuzhiyun kunmap_atomic(kto);
48*4882a593Smuzhiyun }
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /*
51*4882a593Smuzhiyun * Faraday optimised clear_user_page
52*4882a593Smuzhiyun *
53*4882a593Smuzhiyun * Same story as above.
54*4882a593Smuzhiyun */
fa_clear_user_highpage(struct page * page,unsigned long vaddr)55*4882a593Smuzhiyun void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
56*4882a593Smuzhiyun {
57*4882a593Smuzhiyun void *ptr, *kaddr = kmap_atomic(page);
58*4882a593Smuzhiyun asm volatile("\
59*4882a593Smuzhiyun mov r1, %2 @ 1\n\
60*4882a593Smuzhiyun mov r2, #0 @ 1\n\
61*4882a593Smuzhiyun mov r3, #0 @ 1\n\
62*4882a593Smuzhiyun mov ip, #0 @ 1\n\
63*4882a593Smuzhiyun mov lr, #0 @ 1\n\
64*4882a593Smuzhiyun 1: stmia %0, {r2, r3, ip, lr} @ 4\n\
65*4882a593Smuzhiyun mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
66*4882a593Smuzhiyun add %0, %0, #16 @ 1\n\
67*4882a593Smuzhiyun stmia %0, {r2, r3, ip, lr} @ 4\n\
68*4882a593Smuzhiyun mcr p15, 0, %0, c7, c14, 1 @ 1 clean and invalidate D line\n\
69*4882a593Smuzhiyun add %0, %0, #16 @ 1\n\
70*4882a593Smuzhiyun subs r1, r1, #1 @ 1\n\
71*4882a593Smuzhiyun bne 1b @ 1\n\
72*4882a593Smuzhiyun mcr p15, 0, r1, c7, c10, 4 @ 1 drain WB"
73*4882a593Smuzhiyun : "=r" (ptr)
74*4882a593Smuzhiyun : "0" (kaddr), "I" (PAGE_SIZE / 32)
75*4882a593Smuzhiyun : "r1", "r2", "r3", "ip", "lr");
76*4882a593Smuzhiyun kunmap_atomic(kaddr);
77*4882a593Smuzhiyun }
78*4882a593Smuzhiyun
79*4882a593Smuzhiyun struct cpu_user_fns fa_user_fns __initdata = {
80*4882a593Smuzhiyun .cpu_clear_user_highpage = fa_clear_user_highpage,
81*4882a593Smuzhiyun .cpu_copy_user_highpage = fa_copy_user_highpage,
82*4882a593Smuzhiyun };
83