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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/unicore32/mm/tlb-ucv2.S
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/*

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 * linux/arch/unicore32/mm/tlb-ucv2.S

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 *

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 * Code specific to PKUnity SoC and UniCore ISA

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 *

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 * Copyright (C) 2001-2010 GUAN Xue-tao

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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/init.h>

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#include <linux/linkage.h>

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#include <asm/assembler.h>

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#include <asm/page.h>

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#include <asm/tlbflush.h>

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#include "proc-macros.S"

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/*

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 *	__cpu_flush_user_tlb_range(start, end, vma)

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 *

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 *	Invalidate a range of TLB entries in the specified address space.

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 *

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 *	- start - start address (may not be aligned)

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 *	- end   - end address (exclusive, may not be aligned)

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 *	- vma   - vma_struct describing address range

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 */

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ENTRY(__cpu_flush_user_tlb_range)

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#ifndef	CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE

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	mov	r0, r0 >> #PAGE_SHIFT		@ align address

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	mov	r0, r0 << #PAGE_SHIFT

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	vma_vm_flags r2, r2			@ get vma->vm_flags

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1:

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	movc	p0.c6, r0, #3

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	nop8

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	cand.a	r2, #VM_EXEC			@ Executable area ?

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	beq	2f

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	movc	p0.c6, r0, #5

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	nop8

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2:

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	add	r0, r0, #PAGE_SZ

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	csub.a	r0, r1

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	beb	1b

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#else

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	movc	p0.c6, r0, #2

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	nop8

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	cand.a	r2, #VM_EXEC			@ Executable area ?

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	beq	2f

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	movc	p0.c6, r0, #4

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	nop8

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2:

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#endif

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	mov	pc, lr

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/*

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 *	__cpu_flush_kern_tlb_range(start,end)

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 *

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 *	Invalidate a range of kernel TLB entries

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 *

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 *	- start - start address (may not be aligned)

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 *	- end   - end address (exclusive, may not be aligned)

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 */

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ENTRY(__cpu_flush_kern_tlb_range)

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#ifndef	CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE

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	mov	r0, r0 >> #PAGE_SHIFT		@ align address

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	mov	r0, r0 << #PAGE_SHIFT

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1:

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	movc	p0.c6, r0, #3

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	nop8

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	movc	p0.c6, r0, #5

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	nop8

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	add	r0, r0, #PAGE_SZ

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	csub.a	r0, r1

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	beb	1b

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#else

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	movc	p0.c6, r0, #2

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	nop8

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	movc	p0.c6, r0, #4

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	nop8

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#endif

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	mov	pc, lr

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