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-rw-r--r--arch/arm/mm/copypage-xscale.S113
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diff --git a/arch/arm/mm/copypage-xscale.S b/arch/arm/mm/copypage-xscale.S
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--- a/arch/arm/mm/copypage-xscale.S
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-/*
- * linux/arch/arm/lib/copypage-xscale.S
- *
- * Copyright (C) 2001 Russell King
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <asm/constants.h>
-
-/*
- * General note:
- * We don't really want write-allocate cache behaviour for these functions
- * since that will just eat through 8K of the cache.
- */
-
- .text
- .align 5
-/*
- * XScale optimised copy_user_page
- * r0 = destination
- * r1 = source
- * r2 = virtual user address of ultimate destination page
- *
- * The source page may have some clean entries in the cache already, but we
- * can safely ignore them - break_cow() will flush them out of the cache
- * if we eventually end up using our copied page.
- *
- * What we could do is use the mini-cache to buffer reads from the source
- * page. We rely on the mini-cache being smaller than one page, so we'll
- * cycle through the complete cache anyway.
- */
-ENTRY(xscale_mc_copy_user_page)
- stmfd sp!, {r4, r5, lr}
- mov r5, r0
- mov r0, r1
- bl map_page_minicache
- mov r1, r5
- mov lr, #PAGE_SZ/64-1
-
- /*
- * Strangely enough, best performance is achieved
- * when prefetching destination as well. (NP)
- */
- pld [r0, #0]
- pld [r0, #32]
- pld [r1, #0]
- pld [r1, #32]
-
-1: pld [r0, #64]
- pld [r0, #96]
- pld [r1, #64]
- pld [r1, #96]
-
-2: ldrd r2, [r0], #8
- ldrd r4, [r0], #8
- mov ip, r1
- strd r2, [r1], #8
- ldrd r2, [r0], #8
- strd r4, [r1], #8
- ldrd r4, [r0], #8
- strd r2, [r1], #8
- strd r4, [r1], #8
- mcr p15, 0, ip, c7, c10, 1 @ clean D line
- ldrd r2, [r0], #8
- mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
- ldrd r4, [r0], #8
- mov ip, r1
- strd r2, [r1], #8
- ldrd r2, [r0], #8
- strd r4, [r1], #8
- ldrd r4, [r0], #8
- strd r2, [r1], #8
- strd r4, [r1], #8
- mcr p15, 0, ip, c7, c10, 1 @ clean D line
- subs lr, lr, #1
- mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
- bgt 1b
- beq 2b
-
- ldmfd sp!, {r4, r5, pc}
-
- .align 5
-/*
- * XScale optimised clear_user_page
- * r0 = destination
- * r1 = virtual user address of ultimate destination page
- */
-ENTRY(xscale_mc_clear_user_page)
- mov r1, #PAGE_SZ/32
- mov r2, #0
- mov r3, #0
-1: mov ip, r0
- strd r2, [r0], #8
- strd r2, [r0], #8
- strd r2, [r0], #8
- strd r2, [r0], #8
- mcr p15, 0, ip, c7, c10, 1 @ clean D line
- subs r1, r1, #1
- mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
- bne 1b
- mov pc, lr
-
- __INITDATA
-
- .type xscale_mc_user_fns, #object
-ENTRY(xscale_mc_user_fns)
- .long xscale_mc_clear_user_page
- .long xscale_mc_copy_user_page
- .size xscale_mc_user_fns, . - xscale_mc_user_fns
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