blob: 39a994542cadff71c6d829c38b009f343b9bfb18 [file] [log] [blame]
Russell Kingd73e60b2008-10-31 13:08:02 +00001/*
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>
Russell King063b0a42008-10-31 15:08:35 +000014#include <linux/highmem.h>
Russell Kingd73e60b2008-10-31 13:08:02 +000015
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/*
Russell King063b0a42008-10-31 15:08:35 +000023 * XSC3 optimised copy_user_highpage
Russell Kingd73e60b2008-10-31 13:08:02 +000024 * r0 = destination
25 * r1 = source
Russell Kingd73e60b2008-10-31 13:08:02 +000026 *
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 */
Russell King063b0a42008-10-31 15:08:35 +000032static void __attribute__((naked))
33xsc3_mc_copy_user_page(void *kto, const void *kfrom)
Russell Kingd73e60b2008-10-31 13:08:02 +000034{
35 asm("\
36 stmfd sp!, {r4, r5, lr} \n\
37 mov lr, %0 \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 : "I" (PAGE_SIZE / 64 - 1));
71}
72
Russell King063b0a42008-10-31 15:08:35 +000073void xsc3_mc_copy_user_highpage(struct page *to, struct page *from,
74 unsigned long vaddr)
75{
76 void *kto, *kfrom;
77
78 kto = kmap_atomic(to, KM_USER0);
79 kfrom = kmap_atomic(from, KM_USER1);
80 xsc3_mc_copy_user_page(kto, kfrom);
81 kunmap_atomic(kfrom, KM_USER1);
82 kunmap_atomic(kto, KM_USER0);
83}
84
Russell Kingd73e60b2008-10-31 13:08:02 +000085/*
86 * XScale optimised clear_user_page
87 * r0 = destination
88 * r1 = virtual user address of ultimate destination page
89 */
Russell King303c6442008-10-31 16:32:19 +000090void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
Russell Kingd73e60b2008-10-31 13:08:02 +000091{
Nicolas Pitre43ae2862008-11-04 02:42:27 -050092 void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
93 asm volatile ("\
94 mov r1, %2 \n\
Russell Kingd73e60b2008-10-31 13:08:02 +000095 mov r2, #0 \n\
96 mov r3, #0 \n\
Russell King303c6442008-10-31 16:32:19 +0000971: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\
98 strd r2, [%0], #8 \n\
99 strd r2, [%0], #8 \n\
100 strd r2, [%0], #8 \n\
101 strd r2, [%0], #8 \n\
Russell Kingd73e60b2008-10-31 13:08:02 +0000102 subs r1, r1, #1 \n\
Russell King303c6442008-10-31 16:32:19 +0000103 bne 1b"
Nicolas Pitre43ae2862008-11-04 02:42:27 -0500104 : "=r" (ptr)
105 : "0" (kaddr), "I" (PAGE_SIZE / 32)
Russell King303c6442008-10-31 16:32:19 +0000106 : "r1", "r2", "r3");
107 kunmap_atomic(kaddr, KM_USER0);
Russell Kingd73e60b2008-10-31 13:08:02 +0000108}
109
110struct cpu_user_fns xsc3_mc_user_fns __initdata = {
Russell King303c6442008-10-31 16:32:19 +0000111 .cpu_clear_user_highpage = xsc3_mc_clear_user_highpage,
Russell King063b0a42008-10-31 15:08:35 +0000112 .cpu_copy_user_highpage = xsc3_mc_copy_user_highpage,
Russell Kingd73e60b2008-10-31 13:08:02 +0000113};