mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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98 lines
2.1 KiB
ArmAsm
98 lines
2.1 KiB
ArmAsm
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/*
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* linux/arch/arm/lib/copypage-xsc3.S
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*
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* Copyright (C) 2004 Intel Corp.
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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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* Adapted for 3rd gen XScale core, no more mini-dcache
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* Author: Matt Gilbert (matthew.m.gilbert@intel.com)
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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/asm-offsets.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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* XSC3 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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*/
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ENTRY(xsc3_mc_copy_user_page)
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stmfd sp!, {r4, r5, lr}
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mov lr, #PAGE_SZ/64-1
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pld [r1, #0]
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pld [r1, #32]
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1: pld [r1, #64]
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pld [r1, #96]
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2: ldrd r2, [r1], #8
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mov ip, r0
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ldrd r4, [r1], #8
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mcr p15, 0, ip, c7, c6, 1 @ invalidate
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strd r2, [r0], #8
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ldrd r2, [r1], #8
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strd r4, [r0], #8
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ldrd r4, [r1], #8
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strd r2, [r0], #8
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strd r4, [r0], #8
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ldrd r2, [r1], #8
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mov ip, r0
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ldrd r4, [r1], #8
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mcr p15, 0, ip, c7, c6, 1 @ invalidate
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strd r2, [r0], #8
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ldrd r2, [r1], #8
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subs lr, lr, #1
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strd r4, [r0], #8
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ldrd r4, [r1], #8
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strd r2, [r0], #8
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strd r4, [r0], #8
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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(xsc3_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: mcr p15, 0, r0, c7, c6, 1 @ invalidate line
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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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subs r1, r1, #1
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bne 1b
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mov pc, lr
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__INITDATA
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.type xsc3_mc_user_fns, #object
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ENTRY(xsc3_mc_user_fns)
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.long xsc3_mc_clear_user_page
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.long xsc3_mc_copy_user_page
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.size xsc3_mc_user_fns, . - xsc3_mc_user_fns
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