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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/mm/copypage-xsc3.S
4 *
5 * Copyright (C) 2004 Intel Corp.
6 *
7 * Adapted for 3rd gen XScale core, no more mini-dcache
8 * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
9 */
10#include <linux/init.h>
11#include <linux/highmem.h>
12
13/*
14 * General note:
15 * We don't really want write-allocate cache behaviour for these functions
16 * since that will just eat through 8K of the cache.
17 */
18
19/*
20 * XSC3 optimised copy_user_highpage
21 *
22 * The source page may have some clean entries in the cache already, but we
23 * can safely ignore them - break_cow() will flush them out of the cache
24 * if we eventually end up using our copied page.
25 *
26 */
27static void xsc3_mc_copy_user_page(void *kto, const void *kfrom)
28{
29 int tmp;
30
31 asm volatile ("\
32.arch xscale \n\
33 pld [%1, #0] \n\
34 pld [%1, #32] \n\
351: pld [%1, #64] \n\
36 pld [%1, #96] \n\
37 \n\
382: ldrd r2, r3, [%1], #8 \n\
39 ldrd r4, r5, [%1], #8 \n\
40 mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
41 strd r2, r3, [%0], #8 \n\
42 ldrd r2, r3, [%1], #8 \n\
43 strd r4, r5, [%0], #8 \n\
44 ldrd r4, r5, [%1], #8 \n\
45 strd r2, r3, [%0], #8 \n\
46 strd r4, r5, [%0], #8 \n\
47 ldrd r2, r3, [%1], #8 \n\
48 ldrd r4, r5, [%1], #8 \n\
49 mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\
50 strd r2, r3, [%0], #8 \n\
51 ldrd r2, r3, [%1], #8 \n\
52 subs %2, %2, #1 \n\
53 strd r4, r5, [%0], #8 \n\
54 ldrd r4, r5, [%1], #8 \n\
55 strd r2, r3, [%0], #8 \n\
56 strd r4, r5, [%0], #8 \n\
57 bgt 1b \n\
58 beq 2b "
59 : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
60 : "2" (PAGE_SIZE / 64 - 1)
61 : "r2", "r3", "r4", "r5");
62}
63
64void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
65 unsigned long vaddr, struct vm_area_struct *vma)
66{
67 void *kto, *kfrom;
68
69 kto = kmap_atomic(to);
70 kfrom = kmap_atomic(from);
71 flush_cache_page(vma, vaddr, page_to_pfn(from));
72 xsc3_mc_copy_user_page(kto, kfrom);
73 kunmap_atomic(kfrom);
74 kunmap_atomic(kto);
75}
76
77/*
78 * XScale optimised clear_user_page
79 */
80void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
81{
82 void *ptr, *kaddr = kmap_atomic(page);
83 asm volatile ("\
84.arch xscale \n\
85 mov r1, %2 \n\
86 mov r2, #0 \n\
87 mov r3, #0 \n\
881: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
89 strd r2, r3, [%0], #8 \n\
90 strd r2, r3, [%0], #8 \n\
91 strd r2, r3, [%0], #8 \n\
92 strd r2, r3, [%0], #8 \n\
93 subs r1, r1, #1 \n\
94 bne 1b"
95 : "=r" (ptr)
96 : "0" (kaddr), "I" (PAGE_SIZE / 32)
97 : "r1", "r2", "r3");
98 kunmap_atomic(kaddr);
99}
100
101struct cpu_user_fns xsc3_mc_user_fns __initdata = {
102 .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
103 .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
104};
1/*
2 * linux/arch/arm/mm/copypage-xsc3.S
3 *
4 * Copyright (C) 2004 Intel Corp.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Adapted for 3rd gen XScale core, no more mini-dcache
11 * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
12 */
13#include <linux/init.h>
14#include <linux/highmem.h>
15
16/*
17 * General note:
18 * We don't really want write-allocate cache behaviour for these functions
19 * since that will just eat through 8K of the cache.
20 */
21
22/*
23 * XSC3 optimised copy_user_highpage
24 * r0 = destination
25 * r1 = source
26 *
27 * The source page may have some clean entries in the cache already, but we
28 * can safely ignore them - break_cow() will flush them out of the cache
29 * if we eventually end up using our copied page.
30 *
31 */
32static void __naked
33xsc3_mc_copy_user_page(void *kto, const void *kfrom)
34{
35 asm("\
36 stmfd sp!, {r4, r5, lr} \n\
37 mov lr, %2 \n\
38 \n\
39 pld [r1, #0] \n\
40 pld [r1, #32] \n\
411: pld [r1, #64] \n\
42 pld [r1, #96] \n\
43 \n\
442: ldrd r2, [r1], #8 \n\
45 mov ip, r0 \n\
46 ldrd r4, [r1], #8 \n\
47 mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
48 strd r2, [r0], #8 \n\
49 ldrd r2, [r1], #8 \n\
50 strd r4, [r0], #8 \n\
51 ldrd r4, [r1], #8 \n\
52 strd r2, [r0], #8 \n\
53 strd r4, [r0], #8 \n\
54 ldrd r2, [r1], #8 \n\
55 mov ip, r0 \n\
56 ldrd r4, [r1], #8 \n\
57 mcr p15, 0, ip, c7, c6, 1 @ invalidate\n\
58 strd r2, [r0], #8 \n\
59 ldrd r2, [r1], #8 \n\
60 subs lr, lr, #1 \n\
61 strd r4, [r0], #8 \n\
62 ldrd r4, [r1], #8 \n\
63 strd r2, [r0], #8 \n\
64 strd r4, [r0], #8 \n\
65 bgt 1b \n\
66 beq 2b \n\
67 \n\
68 ldmfd sp!, {r4, r5, pc}"
69 :
70 : "r" (kto), "r" (kfrom), "I" (PAGE_SIZE / 64 - 1));
71}
72
73void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
74 unsigned long vaddr, struct vm_area_struct *vma)
75{
76 void *kto, *kfrom;
77
78 kto = kmap_atomic(to, KM_USER0);
79 kfrom = kmap_atomic(from, KM_USER1);
80 flush_cache_page(vma, vaddr, page_to_pfn(from));
81 xsc3_mc_copy_user_page(kto, kfrom);
82 kunmap_atomic(kfrom, KM_USER1);
83 kunmap_atomic(kto, KM_USER0);
84}
85
86/*
87 * XScale optimised clear_user_page
88 * r0 = destination
89 * r1 = virtual user address of ultimate destination page
90 */
91void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
92{
93 void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
94 asm volatile ("\
95 mov r1, %2 \n\
96 mov r2, #0 \n\
97 mov r3, #0 \n\
981: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
99 strd r2, [%0], #8 \n\
100 strd r2, [%0], #8 \n\
101 strd r2, [%0], #8 \n\
102 strd r2, [%0], #8 \n\
103 subs r1, r1, #1 \n\
104 bne 1b"
105 : "=r" (ptr)
106 : "0" (kaddr), "I" (PAGE_SIZE / 32)
107 : "r1", "r2", "r3");
108 kunmap_atomic(kaddr, KM_USER0);
109}
110
111struct cpu_user_fns xsc3_mc_user_fns __initdata = {
112 .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
113 .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
114};