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kernel/linux-rt-4.4.41/arch/mn10300/mm/tlb-mn10300.S 5.04 KB
5113f6f70   김현기   kernel add
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  ###############################################################################
  #
  # TLB loading functions
  #
  # Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
  # Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  # Modified by David Howells (dhowells@redhat.com)
  #
  # This program is free software; you can redistribute it and/or
  # modify it under the terms of the GNU General Public Licence
  # as published by the Free Software Foundation; either version
  # 2 of the Licence, or (at your option) any later version.
  #
  ###############################################################################
  #include <linux/sys.h>
  #include <linux/linkage.h>
  #include <asm/smp.h>
  #include <asm/intctl-regs.h>
  #include <asm/frame.inc>
  #include <asm/page.h>
  #include <asm/pgtable.h>
  
  ###############################################################################
  #
  # Instruction TLB Miss handler entry point
  #
  ###############################################################################
  	.type	itlb_miss,@function
  ENTRY(itlb_miss)
  #ifdef CONFIG_GDBSTUB
  	movm	[d2,d3,a2],(sp)
  #else
  	or	EPSW_nAR,epsw		# switch D0-D3 & A0-A3 to the alternate
  					# register bank
  	nop
  	nop
  	nop
  #endif
  
  #if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
  	mov	(MMUCTR),d2
  	mov	d2,(MMUCTR)
  #endif
  
  	and	~EPSW_NMID,epsw
  	mov	(IPTEU),d3
  	mov	(PTBR),a2
  	mov	d3,d2
  	and	0xffc00000,d2
  	lsr	20,d2
  	mov	(a2,d2),a2		# PTD *ptd = PGD[addr 31..22]
  	btst	_PAGE_VALID,a2
  	beq	itlb_miss_fault		# jump if doesn't point anywhere
  
  	and	~(PAGE_SIZE-1),a2
  	mov	d3,d2
  	and	0x003ff000,d2
  	lsr	10,d2
  	add	d2,a2
  	mov	(a2),d2			# get pte from PTD[addr 21..12]
  	btst	_PAGE_VALID,d2
  	beq	itlb_miss_fault		# jump if doesn't point to a page
  					# (might be a swap id)
  #if	((_PAGE_ACCESSED & 0xffffff00) == 0)
  	bset	_PAGE_ACCESSED,(0,a2)
  #elif	((_PAGE_ACCESSED & 0xffff00ff) == 0)
  	bset	+(_PAGE_ACCESSED >> 8),(1,a2)
  #else
  #error	"_PAGE_ACCESSED value is out of range"
  #endif
  	and	~xPTEL2_UNUSED1,d2
  itlb_miss_set:
  	mov	d2,(IPTEL2)		# change the TLB
  #ifdef CONFIG_GDBSTUB
  	movm	(sp),[d2,d3,a2]
  #endif
  	rti
  
  itlb_miss_fault:
  	mov	_PAGE_VALID,d2		# force address error handler to be
  					# invoked
  	bra	itlb_miss_set
  
  	.size	itlb_miss, . - itlb_miss
  
  ###############################################################################
  #
  # Data TLB Miss handler entry point
  #
  ###############################################################################
  	.type	dtlb_miss,@function
  ENTRY(dtlb_miss)
  #ifdef CONFIG_GDBSTUB
  	movm	[d2,d3,a2],(sp)
  #else
  	or	EPSW_nAR,epsw		# switch D0-D3 & A0-A3 to the alternate
  					# register bank
  	nop
  	nop
  	nop
  #endif
  
  #if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
  	mov	(MMUCTR),d2
  	mov	d2,(MMUCTR)
  #endif
  
  	and	~EPSW_NMID,epsw
  	mov	(DPTEU),d3
  	mov	(PTBR),a2
  	mov	d3,d2
  	and	0xffc00000,d2
  	lsr	20,d2
  	mov	(a2,d2),a2		# PTD *ptd = PGD[addr 31..22]
  	btst	_PAGE_VALID,a2
  	beq	dtlb_miss_fault		# jump if doesn't point anywhere
  
  	and	~(PAGE_SIZE-1),a2
  	mov	d3,d2
  	and	0x003ff000,d2
  	lsr	10,d2
  	add	d2,a2
  	mov	(a2),d2			# get pte from PTD[addr 21..12]
  	btst	_PAGE_VALID,d2
  	beq	dtlb_miss_fault		# jump if doesn't point to a page
  					# (might be a swap id)
  #if	((_PAGE_ACCESSED & 0xffffff00) == 0)
  	bset	_PAGE_ACCESSED,(0,a2)
  #elif	((_PAGE_ACCESSED & 0xffff00ff) == 0)
  	bset	+(_PAGE_ACCESSED >> 8),(1,a2)
  #else
  #error	"_PAGE_ACCESSED value is out of range"
  #endif
  	and	~xPTEL2_UNUSED1,d2
  dtlb_miss_set:
  	mov	d2,(DPTEL2)		# change the TLB
  #ifdef CONFIG_GDBSTUB
  	movm	(sp),[d2,d3,a2]
  #endif
  	rti
  
  dtlb_miss_fault:
  	mov	_PAGE_VALID,d2		# force address error handler to be
  					# invoked
  	bra	dtlb_miss_set
  	.size	dtlb_miss, . - dtlb_miss
  
  ###############################################################################
  #
  # Instruction TLB Address Error handler entry point
  #
  ###############################################################################
  	.type	itlb_aerror,@function
  ENTRY(itlb_aerror)
  	add	-4,sp
  	SAVE_ALL
  
  #if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
  	mov	(MMUCTR),d1
  	mov	d1,(MMUCTR)
  #endif
  
  	and	~EPSW_NMID,epsw
  	add	-4,sp				# need to pass three params
  
  	# calculate the fault code
  	movhu	(MMUFCR_IFC),d1
  	or	0x00010000,d1			# it's an instruction fetch
  
  	# determine the page address
  	mov	(IPTEU),d0
  	and	PAGE_MASK,d0
  	mov	d0,(12,sp)
  
  	clr	d0
  	mov	d0,(IPTEL2)
  
  	or	EPSW_IE,epsw
  	mov	fp,d0
  	call	do_page_fault[],0		# do_page_fault(regs,code,addr
  
  	jmp	ret_from_exception
  	.size	itlb_aerror, . - itlb_aerror
  
  ###############################################################################
  #
  # Data TLB Address Error handler entry point
  #
  ###############################################################################
  	.type	dtlb_aerror,@function
  ENTRY(dtlb_aerror)
  	add	-4,sp
  	SAVE_ALL
  
  #if defined(CONFIG_ERRATUM_NEED_TO_RELOAD_MMUCTR)
  	mov	(MMUCTR),d1
  	mov	d1,(MMUCTR)
  #endif
  
  	add	-4,sp				# need to pass three params
  	and	~EPSW_NMID,epsw
  
  	# calculate the fault code
  	movhu	(MMUFCR_DFC),d1
  
  	# determine the page address
  	mov	(DPTEU),a2
  	mov	a2,d0
  	and	PAGE_MASK,d0
  	mov	d0,(12,sp)
  
  	clr	d0
  	mov	d0,(DPTEL2)
  
  	or	EPSW_IE,epsw
  	mov	fp,d0
  	call	do_page_fault[],0		# do_page_fault(regs,code,addr
  
  	jmp	ret_from_exception
  	.size	dtlb_aerror, . - dtlb_aerror