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Linux/arch/arm/mm/copypage-xsc3.c

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  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  */
 32 static void __naked
 33 xsc3_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\
 41 1:      pld     [r1, #64]                       \n\
 42         pld     [r1, #96]                       \n\
 43                                                 \n\
 44 2:      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 
 73 void 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);
 79         kfrom = kmap_atomic(from);
 80         flush_cache_page(vma, vaddr, page_to_pfn(from));
 81         xsc3_mc_copy_user_page(kto, kfrom);
 82         kunmap_atomic(kfrom);
 83         kunmap_atomic(kto);
 84 }
 85 
 86 /*
 87  * XScale optimised clear_user_page
 88  *  r0 = destination
 89  *  r1 = virtual user address of ultimate destination page
 90  */
 91 void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr)
 92 {
 93         void *ptr, *kaddr = kmap_atomic(page);
 94         asm volatile ("\
 95         mov     r1, %2                          \n\
 96         mov     r2, #0                          \n\
 97         mov     r3, #0                          \n\
 98 1:      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         : "" (kaddr), "I" (PAGE_SIZE / 32)
107         : "r1", "r2", "r3");
108         kunmap_atomic(kaddr);
109 }
110 
111 struct 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 };
115 

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