arch/arm/mm/copypage-feroceon.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mm/copypage-feroceon.S
   4  *
   5  *  Copyright (C) 2008 Marvell Semiconductors
   6  *
   7  * This handles copy_user_highpage and clear_user_page on Feroceon
   8  * more optimally than the generic implementations.
   9  */
  10 #include <linux/init.h>
  11 #include <linux/highmem.h>
  12
  13 static void feroceon_copy_user_page(void *kto, const void *kfrom)
  14 {
  15         int tmp;
  16
  17         asm volatile ("\
  18 .arch   armv5te                                 \n\
  19 1:      ldmia   %1!, {r2 - r7, ip, lr}          \n\
  20         pld     [%1, #0]                        \n\
  21         pld     [%1, #32]                       \n\
  22         pld     [%1, #64]                       \n\
  23         pld     [%1, #96]                       \n\
  24         pld     [%1, #128]                      \n\
  25         pld     [%1, #160]                      \n\
  26         pld     [%1, #192]                      \n\
  27         stmia   %0, {r2 - r7, ip, lr}           \n\
  28         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  29         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  30         add     %0, %0, #32                     \n\
  31         stmia   %0, {r2 - r7, ip, lr}           \n\
  32         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  33         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  34         add     %0, %0, #32                     \n\
  35         stmia   %0, {r2 - r7, ip, lr}           \n\
  36         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  37         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  38         add     %0, %0, #32                     \n\
  39         stmia   %0, {r2 - r7, ip, lr}           \n\
  40         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  41         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  42         add     %0, %0, #32                     \n\
  43         stmia   %0, {r2 - r7, ip, lr}           \n\
  44         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  45         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  46         add     %0, %0, #32                     \n\
  47         stmia   %0, {r2 - r7, ip, lr}           \n\
  48         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  49         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  50         add     %0, %0, #32                     \n\
  51         stmia   %0, {r2 - r7, ip, lr}           \n\
  52         ldmia   %1!, {r2 - r7, ip, lr}          \n\
  53         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  54         add     %0, %0, #32                     \n\
  55         stmia   %0, {r2 - r7, ip, lr}           \n\
  56         subs    %2, %2, #(32 * 8)               \n\
  57         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  58         add     %0, %0, #32                     \n\
  59         bne     1b                              \n\
  60         mcr     p15, 0, %2, c7, c10, 4          @ drain WB"
  61         : "+&r" (kto), "+&r" (kfrom), "=&r" (tmp)
  62         : "2" (PAGE_SIZE)
  63         : "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
  64 }
  65
  66 void feroceon_copy_user_highpage(struct page *to, struct page *from,
  67         unsigned long vaddr, struct vm_area_struct *vma)
  68 {
  69         void *kto, *kfrom;
  70
  71         kto = kmap_atomic(to);
  72         kfrom = kmap_atomic(from);
  73         flush_cache_page(vma, vaddr, page_to_pfn(from));
  74         feroceon_copy_user_page(kto, kfrom);
  75         kunmap_atomic(kfrom);
  76         kunmap_atomic(kto);
  77 }
  78
  79 void feroceon_clear_user_highpage(struct page *page, unsigned long vaddr)
  80 {
  81         void *ptr, *kaddr = kmap_atomic(page);
  82         asm volatile ("\
  83         mov     r1, %2                          \n\
  84         mov     r2, #0                          \n\
  85         mov     r3, #0                          \n\
  86         mov     r4, #0                          \n\
  87         mov     r5, #0                          \n\
  88         mov     r6, #0                          \n\
  89         mov     r7, #0                          \n\
  90         mov     ip, #0                          \n\
  91         mov     lr, #0                          \n\
  92 1:      stmia   %0, {r2-r7, ip, lr}             \n\
  93         subs    r1, r1, #1                      \n\
  94         mcr     p15, 0, %0, c7, c14, 1          @ clean and invalidate D line\n\
  95         add     %0, %0, #32                     \n\
  96         bne     1b                              \n\
  97         mcr     p15, 0, r1, c7, c10, 4          @ drain WB"
  98         : "=r" (ptr)
  99         : "0" (kaddr), "I" (PAGE_SIZE / 32)
 100         : "r1", "r2", "r3", "r4", "r5", "r6", "r7", "ip", "lr");
 101         kunmap_atomic(kaddr);
 102 }
 103
 104 struct cpu_user_fns feroceon_user_fns __initdata = {
 105         .cpu_clear_user_highpage = feroceon_clear_user_highpage,
 106         .cpu_copy_user_highpage = feroceon_copy_user_highpage,
 107 };
 108