forked from luck/tmp_suning_uos_patched
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
114 lines
2.6 KiB
ArmAsm
114 lines
2.6 KiB
ArmAsm
/*
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* linux/arch/arm/lib/copypage-xscale.S
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*
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* Copyright (C) 2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <linux/init.h>
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#include <asm/constants.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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.text
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.align 5
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/*
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* XScale optimised copy_user_page
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* r0 = destination
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* r1 = source
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* r2 = virtual user address of ultimate destination page
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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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* What we could do is use the mini-cache to buffer reads from the source
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* page. We rely on the mini-cache being smaller than one page, so we'll
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* cycle through the complete cache anyway.
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*/
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ENTRY(xscale_mc_copy_user_page)
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stmfd sp!, {r4, r5, lr}
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mov r5, r0
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mov r0, r1
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bl map_page_minicache
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mov r1, r5
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mov lr, #PAGE_SZ/64-1
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/*
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* Strangely enough, best performance is achieved
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* when prefetching destination as well. (NP)
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*/
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pld [r0, #0]
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pld [r0, #32]
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pld [r1, #0]
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pld [r1, #32]
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1: pld [r0, #64]
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pld [r0, #96]
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pld [r1, #64]
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pld [r1, #96]
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2: ldrd r2, [r0], #8
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ldrd r4, [r0], #8
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mov ip, r1
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strd r2, [r1], #8
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ldrd r2, [r0], #8
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strd r4, [r1], #8
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ldrd r4, [r0], #8
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strd r2, [r1], #8
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strd r4, [r1], #8
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mcr p15, 0, ip, c7, c10, 1 @ clean D line
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ldrd r2, [r0], #8
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
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ldrd r4, [r0], #8
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mov ip, r1
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strd r2, [r1], #8
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ldrd r2, [r0], #8
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strd r4, [r1], #8
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ldrd r4, [r0], #8
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strd r2, [r1], #8
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strd r4, [r1], #8
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mcr p15, 0, ip, c7, c10, 1 @ clean D line
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subs lr, lr, #1
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
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bgt 1b
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beq 2b
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ldmfd sp!, {r4, r5, pc}
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.align 5
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/*
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* XScale optimised clear_user_page
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* r0 = destination
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* r1 = virtual user address of ultimate destination page
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*/
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ENTRY(xscale_mc_clear_user_page)
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mov r1, #PAGE_SZ/32
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mov r2, #0
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mov r3, #0
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1: mov ip, r0
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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strd r2, [r0], #8
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mcr p15, 0, ip, c7, c10, 1 @ clean D line
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subs r1, r1, #1
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mcr p15, 0, ip, c7, c6, 1 @ invalidate D line
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bne 1b
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mov pc, lr
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__INITDATA
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.type xscale_mc_user_fns, #object
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ENTRY(xscale_mc_user_fns)
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.long xscale_mc_clear_user_page
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.long xscale_mc_copy_user_page
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.size xscale_mc_user_fns, . - xscale_mc_user_fns
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