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https://github.com/edk2-porting/linux-next.git
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b920de1b77
Add architecture support for the MN10300/AM33 CPUs produced by MEI to the kernel. This patch also adds board support for the ASB2303 with the ASB2308 daughter board, and the ASB2305. The only processor supported is the MN103E010, which is an AM33v2 core plus on-chip devices. [akpm@linux-foundation.org: nuke cvs control strings] Signed-off-by: Masakazu Urade <urade.masakazu@jp.panasonic.com> Signed-off-by: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
208 lines
4.7 KiB
ArmAsm
208 lines
4.7 KiB
ArmAsm
###############################################################################
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#
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# TLB loading functions
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#
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# Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
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# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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# Modified by David Howells (dhowells@redhat.com)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public Licence
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# as published by the Free Software Foundation; either version
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# 2 of the Licence, or (at your option) any later version.
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#
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###############################################################################
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/smp.h>
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#include <asm/intctl-regs.h>
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#include <asm/frame.inc>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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###############################################################################
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#
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# Instruction TLB Miss handler entry point
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#
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###############################################################################
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.type itlb_miss,@function
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ENTRY(itlb_miss)
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and ~EPSW_NMID,epsw
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#ifdef CONFIG_GDBSTUB
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movm [d2,d3,a2],(sp)
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#else
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or EPSW_nAR,epsw # switch D0-D3 & A0-A3 to the alternate
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# register bank
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nop
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nop
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nop
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#endif
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mov (IPTEU),d3
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mov (PTBR),a2
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mov d3,d2
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and 0xffc00000,d2
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lsr 20,d2
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mov (a2,d2),a2 # PTD *ptd = PGD[addr 31..22]
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btst _PAGE_VALID,a2
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beq itlb_miss_fault # jump if doesn't point anywhere
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and ~(PAGE_SIZE-1),a2
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mov d3,d2
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and 0x003ff000,d2
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lsr 10,d2
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add d2,a2
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mov (a2),d2 # get pte from PTD[addr 21..12]
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btst _PAGE_VALID,d2
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beq itlb_miss_fault # jump if doesn't point to a page
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# (might be a swap id)
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bset _PAGE_ACCESSED,(0,a2)
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and ~(xPTEL_UNUSED1|xPTEL_UNUSED2),d2
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itlb_miss_set:
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mov d2,(IPTEL) # change the TLB
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#ifdef CONFIG_GDBSTUB
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movm (sp),[d2,d3,a2]
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#endif
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rti
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itlb_miss_fault:
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mov _PAGE_VALID,d2 # force address error handler to be
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# invoked
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bra itlb_miss_set
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.size itlb_miss, . - itlb_miss
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###############################################################################
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#
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# Data TLB Miss handler entry point
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#
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###############################################################################
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.type dtlb_miss,@function
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ENTRY(dtlb_miss)
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and ~EPSW_NMID,epsw
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#ifdef CONFIG_GDBSTUB
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movm [d2,d3,a2],(sp)
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#else
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or EPSW_nAR,epsw # switch D0-D3 & A0-A3 to the alternate
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# register bank
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nop
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nop
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nop
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#endif
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mov (DPTEU),d3
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mov (PTBR),a2
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mov d3,d2
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and 0xffc00000,d2
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lsr 20,d2
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mov (a2,d2),a2 # PTD *ptd = PGD[addr 31..22]
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btst _PAGE_VALID,a2
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beq dtlb_miss_fault # jump if doesn't point anywhere
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and ~(PAGE_SIZE-1),a2
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mov d3,d2
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and 0x003ff000,d2
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lsr 10,d2
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add d2,a2
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mov (a2),d2 # get pte from PTD[addr 21..12]
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btst _PAGE_VALID,d2
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beq dtlb_miss_fault # jump if doesn't point to a page
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# (might be a swap id)
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bset _PAGE_ACCESSED,(0,a2)
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and ~(xPTEL_UNUSED1|xPTEL_UNUSED2),d2
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dtlb_miss_set:
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mov d2,(DPTEL) # change the TLB
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#ifdef CONFIG_GDBSTUB
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movm (sp),[d2,d3,a2]
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#endif
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rti
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dtlb_miss_fault:
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mov _PAGE_VALID,d2 # force address error handler to be
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# invoked
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bra dtlb_miss_set
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.size dtlb_miss, . - dtlb_miss
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###############################################################################
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#
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# Instruction TLB Address Error handler entry point
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#
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###############################################################################
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.type itlb_aerror,@function
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ENTRY(itlb_aerror)
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and ~EPSW_NMID,epsw
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add -4,sp
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SAVE_ALL
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add -4,sp # need to pass three params
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# calculate the fault code
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movhu (MMUFCR_IFC),d1
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or 0x00010000,d1 # it's an instruction fetch
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# determine the page address
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mov (IPTEU),a2
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mov a2,d0
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and PAGE_MASK,d0
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mov d0,(12,sp)
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clr d0
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mov d0,(IPTEL)
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and ~EPSW_NMID,epsw
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or EPSW_IE,epsw
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mov fp,d0
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call do_page_fault[],0 # do_page_fault(regs,code,addr
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jmp ret_from_exception
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.size itlb_aerror, . - itlb_aerror
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###############################################################################
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#
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# Data TLB Address Error handler entry point
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#
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###############################################################################
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.type dtlb_aerror,@function
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ENTRY(dtlb_aerror)
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and ~EPSW_NMID,epsw
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add -4,sp
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mov d1,(sp)
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movhu (MMUFCR_DFC),d1 # is it the initial valid write
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# to this page?
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and MMUFCR_xFC_INITWR,d1
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beq dtlb_pagefault # jump if not
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mov (DPTEL),d1 # set the dirty bit
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# (don't replace with BSET!)
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or _PAGE_DIRTY,d1
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mov d1,(DPTEL)
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mov (sp),d1
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add 4,sp
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rti
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ALIGN
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dtlb_pagefault:
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mov (sp),d1
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SAVE_ALL
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add -4,sp # need to pass three params
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# calculate the fault code
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movhu (MMUFCR_DFC),d1
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# determine the page address
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mov (DPTEU),a2
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mov a2,d0
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and PAGE_MASK,d0
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mov d0,(12,sp)
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clr d0
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mov d0,(DPTEL)
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and ~EPSW_NMID,epsw
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or EPSW_IE,epsw
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mov fp,d0
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call do_page_fault[],0 # do_page_fault(regs,code,addr
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jmp ret_from_exception
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.size dtlb_aerror, . - dtlb_aerror
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