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102 lines
2.5 KiB
102 lines
2.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/mm/copypage-xsc3.S |
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* |
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* Copyright (C) 2004 Intel Corp. |
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* |
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* Adapted for 3rd gen XScale core, no more mini-dcache |
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* Author: Matt Gilbert ([email protected]) |
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*/ |
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#include <linux/init.h> |
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#include <linux/highmem.h> |
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/* |
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* General note: |
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* We don't really want write-allocate cache behaviour for these functions |
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* since that will just eat through 8K of the cache. |
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*/ |
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/* |
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* XSC3 optimised copy_user_highpage |
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* |
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* The source page may have some clean entries in the cache already, but we |
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* can safely ignore them - break_cow() will flush them out of the cache |
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* if we eventually end up using our copied page. |
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* |
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*/ |
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static void xsc3_mc_copy_user_page(void *kto, const void *kfrom) |
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{ |
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int tmp; |
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asm volatile ("\ |
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pld [%1, #0] \n\ |
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pld [%1, #32] \n\ |
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1: pld [%1, #64] \n\ |
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pld [%1, #96] \n\ |
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\n\ |
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2: ldrd r2, r3, [%1], #8 \n\ |
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ldrd r4, r5, [%1], #8 \n\ |
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mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ |
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strd r2, r3, [%0], #8 \n\ |
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ldrd r2, r3, [%1], #8 \n\ |
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strd r4, r5, [%0], #8 \n\ |
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ldrd r4, r5, [%1], #8 \n\ |
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strd r2, r3, [%0], #8 \n\ |
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strd r4, r5, [%0], #8 \n\ |
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ldrd r2, r3, [%1], #8 \n\ |
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ldrd r4, r5, [%1], #8 \n\ |
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mcr p15, 0, %0, c7, c6, 1 @ invalidate\n\ |
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strd r2, r3, [%0], #8 \n\ |
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ldrd r2, r3, [%1], #8 \n\ |
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subs %2, %2, #1 \n\ |
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strd r4, r5, [%0], #8 \n\ |
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ldrd r4, r5, [%1], #8 \n\ |
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strd r2, r3, [%0], #8 \n\ |
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strd r4, r5, [%0], #8 \n\ |
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bgt 1b \n\ |
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beq 2b " |
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: "+&r" (kto), "+&r" (kfrom), "=&r" (tmp) |
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: "2" (PAGE_SIZE / 64 - 1) |
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: "r2", "r3", "r4", "r5"); |
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} |
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void xsc3_mc_copy_user_highpage(struct page *to, struct page *from, |
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unsigned long vaddr, struct vm_area_struct *vma) |
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{ |
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void *kto, *kfrom; |
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kto = kmap_atomic(to); |
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kfrom = kmap_atomic(from); |
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flush_cache_page(vma, vaddr, page_to_pfn(from)); |
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xsc3_mc_copy_user_page(kto, kfrom); |
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kunmap_atomic(kfrom); |
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kunmap_atomic(kto); |
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} |
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/* |
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* XScale optimised clear_user_page |
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*/ |
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void xsc3_mc_clear_user_highpage(struct page *page, unsigned long vaddr) |
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{ |
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void *ptr, *kaddr = kmap_atomic(page); |
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asm volatile ("\ |
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mov r1, %2 \n\ |
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mov r2, #0 \n\ |
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mov r3, #0 \n\ |
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1: mcr p15, 0, %0, c7, c6, 1 @ invalidate line\n\ |
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strd r2, r3, [%0], #8 \n\ |
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strd r2, r3, [%0], #8 \n\ |
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strd r2, r3, [%0], #8 \n\ |
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strd r2, r3, [%0], #8 \n\ |
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subs r1, r1, #1 \n\ |
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bne 1b" |
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: "=r" (ptr) |
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: "0" (kaddr), "I" (PAGE_SIZE / 32) |
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: "r1", "r2", "r3"); |
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kunmap_atomic(kaddr); |
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} |
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struct cpu_user_fns xsc3_mc_user_fns __initdata = { |
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.cpu_clear_user_highpage = xsc3_mc_clear_user_highpage, |
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.cpu_copy_user_highpage = xsc3_mc_copy_user_highpage, |
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};
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