2 * linux/arch/unicore32/mm/proc-macros.S
4 * Code specific to PKUnity SoC and UniCore ISA
6 * Copyright (C) 2001-2010 GUAN Xue-tao
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * We need constants.h for:
17 #include <generated/asm-offsets.h>
18 #include <asm/thread_info.h>
19 #include <asm/memory.h>
22 * the cache line sizes of the I and D cache are the same
24 #define CACHE_LINESIZE 32
27 * This is the maximum size of an area which will be invalidated
28 * using the single invalidate entry instructions. Anything larger
29 * than this, and we go for the whole cache.
31 * This value should be chosen such that we choose the cheapest
34 #ifdef CONFIG_CPU_UCV2
35 #define MAX_AREA_SIZE 0x800 /* 64 cache line */
39 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
41 .macro vma_vm_mm, rd, rn
42 ldw \rd, [\rn+], #VMA_VM_MM
46 * vma_vm_flags - get vma->vm_flags
48 .macro vma_vm_flags, rd, rn
49 ldw \rd, [\rn+], #VMA_VM_FLAGS
53 ldw \rd, [\rn+], #TI_TASK
54 ldw \rd, [\rd+], #TSK_ACTIVE_MM
58 * act_mm - get current->active_mm
63 ldw \rd, [\rd+], #TI_TASK
64 ldw \rd, [\rd+], #TSK_ACTIVE_MM
68 * mmid - get context id from mm pointer (mm->context.id)
71 ldw \rd, [\rn+], #MM_CONTEXT_ID
75 * mask_asid - mask the ASID from the context ID
81 .macro crval, clear, mmuset, ucset
86 #ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
88 * va2pa va, pa, tbl, msk, off, err
89 * This macro is used to translate virtual address to its physical address.
92 * pa: physical address, result is stored in this register
93 * tbl, msk, off: temp registers, will be destroyed
94 * err: jump to error label if the physical address not exist
95 * NOTE: all regs must be different
97 .macro va2pa, va, pa, tbl, msk, off, err=990f
99 mov \off, \va >> #22 @ off <- index of 1st page table
100 adr \tbl, 910f @ tbl <- table of 1st page table
101 900: @ ---- handle 1, 2 page table
102 add \pa, \pa, #PAGE_OFFSET @ pa <- virt addr of page table
103 ldw \pa, [\pa+], \off << #2 @ pa <- the content of pt
104 cand.a \pa, #4 @ test exist bit
105 beq \err @ if not exist
106 and \off, \pa, #3 @ off <- the last 2 bits
107 add \tbl, \tbl, \off << #3 @ cmove table pointer
108 ldw \msk, [\tbl+], #0 @ get the mask
110 930: @ ---- handle 2nd page table
111 and \pa, \pa, \msk @ pa <- phys addr of 2nd pt
113 cntlo \tbl, \msk @ use tbl as temp reg
114 mov \off, \off >> \tbl
115 mov \off, \off >> #2 @ off <- index of 2nd pt
116 adr \tbl, 920f @ tbl <- table of 2nd pt
118 910: @ 1st level page table
119 .word 0xfffff000, 930b @ second level page table
120 .word 0xfffffc00, 930b @ second level large page table
121 .word 0x00000000, \err @ invalid
122 .word 0xffc00000, 980f @ super page
124 920: @ 2nd level page table
125 .word 0xfffff000, 980f @ page
126 .word 0xffffc000, 980f @ middle page
127 .word 0xffff0000, 980f @ large page
128 .word 0x00000000, \err @ invalid
137 .macro dcacheline_flush, addr, t1, t2
138 mov \t1, \addr << #20
139 ldw \t2, =_stext @ _stext must ALIGN(4096)
140 add \t2, \t2, \t1 >> #20
141 ldw \t1, [\t2+], #0x0000
142 ldw \t1, [\t2+], #0x1000
143 ldw \t1, [\t2+], #0x2000
144 ldw \t1, [\t2+], #0x3000