/*
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* linux/arch/unicore32/mm/proc-macros.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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* We need constants.h for:
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* VMA_VM_MM
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* VMA_VM_FLAGS
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* VM_EXEC
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*/
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#include <generated/asm-offsets.h>
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#include <asm/thread_info.h>
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#include <asm/memory.h>
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/*
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* the cache line sizes of the I and D cache are the same
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*/
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#define CACHE_LINESIZE 32
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/*
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* This is the maximum size of an area which will be invalidated
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* using the single invalidate entry instructions. Anything larger
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* than this, and we go for the whole cache.
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*
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* This value should be chosen such that we choose the cheapest
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* alternative.
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*/
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#ifdef CONFIG_CPU_UCV2
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#define MAX_AREA_SIZE 0x800 /* 64 cache line */
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#endif
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/*
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* vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
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*/
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.macro vma_vm_mm, rd, rn
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ldw \rd, [\rn+], #VMA_VM_MM
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.endm
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/*
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* vma_vm_flags - get vma->vm_flags
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*/
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.macro vma_vm_flags, rd, rn
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ldw \rd, [\rn+], #VMA_VM_FLAGS
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.endm
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.macro tsk_mm, rd, rn
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ldw \rd, [\rn+], #TI_TASK
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ldw \rd, [\rd+], #TSK_ACTIVE_MM
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.endm
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/*
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* act_mm - get current->active_mm
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*/
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.macro act_mm, rd
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andn \rd, sp, #8128
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andn \rd, \rd, #63
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ldw \rd, [\rd+], #TI_TASK
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ldw \rd, [\rd+], #TSK_ACTIVE_MM
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.endm
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/*
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* mmid - get context id from mm pointer (mm->context.id)
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*/
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.macro mmid, rd, rn
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ldw \rd, [\rn+], #MM_CONTEXT_ID
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.endm
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/*
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* mask_asid - mask the ASID from the context ID
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*/
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.macro asid, rd, rn
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and \rd, \rn, #255
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.endm
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.macro crval, clear, mmuset, ucset
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.word \clear
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.word \mmuset
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.endm
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#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
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/*
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* va2pa va, pa, tbl, msk, off, err
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* This macro is used to translate virtual address to its physical address.
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*
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* va: virtual address
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* pa: physical address, result is stored in this register
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* tbl, msk, off: temp registers, will be destroyed
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* err: jump to error label if the physical address not exist
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* NOTE: all regs must be different
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*/
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.macro va2pa, va, pa, tbl, msk, off, err=990f
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movc \pa, p0.c2, #0
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mov \off, \va >> #22 @ off <- index of 1st page table
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adr \tbl, 910f @ tbl <- table of 1st page table
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900: @ ---- handle 1, 2 page table
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add \pa, \pa, #PAGE_OFFSET @ pa <- virt addr of page table
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ldw \pa, [\pa+], \off << #2 @ pa <- the content of pt
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cand.a \pa, #4 @ test exist bit
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beq \err @ if not exist
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and \off, \pa, #3 @ off <- the last 2 bits
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add \tbl, \tbl, \off << #3 @ cmove table pointer
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ldw \msk, [\tbl+], #0 @ get the mask
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ldw pc, [\tbl+], #4
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930: @ ---- handle 2nd page table
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and \pa, \pa, \msk @ pa <- phys addr of 2nd pt
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mov \off, \va << #10
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cntlo \tbl, \msk @ use tbl as temp reg
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mov \off, \off >> \tbl
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mov \off, \off >> #2 @ off <- index of 2nd pt
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adr \tbl, 920f @ tbl <- table of 2nd pt
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b 900b
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910: @ 1st level page table
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.word 0xfffff000, 930b @ second level page table
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.word 0xfffffc00, 930b @ second level large page table
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.word 0x00000000, \err @ invalid
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.word 0xffc00000, 980f @ super page
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920: @ 2nd level page table
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.word 0xfffff000, 980f @ page
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.word 0xffffc000, 980f @ middle page
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.word 0xffff0000, 980f @ large page
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.word 0x00000000, \err @ invalid
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980:
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andn \tbl, \va, \msk
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and \pa, \pa, \msk
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or \pa, \pa, \tbl
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990:
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.endm
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#endif
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.macro dcacheline_flush, addr, t1, t2
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mov \t1, \addr << #20
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ldw \t2, =_stext @ _stext must ALIGN(4096)
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add \t2, \t2, \t1 >> #20
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ldw \t1, [\t2+], #0x0000
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ldw \t1, [\t2+], #0x1000
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ldw \t1, [\t2+], #0x2000
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ldw \t1, [\t2+], #0x3000
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.endm
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