ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008-2009 Apple Inc. All rights reserved.
   4 #
   5 # All rights reserved. This program and the accompanying materials
   6 # are licensed and made available under the terms and conditions of the BSD License
   7 # which accompanies this distribution.  The full text of the license may be found at
   8 # http://opensource.org/licenses/bsd-license.php
   9 #
  10 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 #
  13 #------------------------------------------------------------------------------
  14
  15 .globl ASM_PFX(ArmInvalidateInstructionCache)
  16 .globl ASM_PFX(ArmInvalidateDataCacheEntryByMVA)
  17 .globl ASM_PFX(ArmCleanDataCacheEntryByMVA)
  18 .globl ASM_PFX(ArmCleanInvalidateDataCacheEntryByMVA)
  19 .globl ASM_PFX(ArmInvalidateDataCacheEntryBySetWay)
  20 .globl ASM_PFX(ArmCleanDataCacheEntryBySetWay)
  21 .globl ASM_PFX(ArmCleanInvalidateDataCacheEntryBySetWay)
  22 .globl ASM_PFX(ArmDrainWriteBuffer)
  23 .globl ASM_PFX(ArmEnableMmu)
  24 .globl ASM_PFX(ArmDisableMmu)
  25 .globl ASM_PFX(ArmMmuEnabled)
  26 .globl ASM_PFX(ArmEnableDataCache)
  27 .globl ASM_PFX(ArmDisableDataCache)
  28 .globl ASM_PFX(ArmEnableInstructionCache)
  29 .globl ASM_PFX(ArmDisableInstructionCache)
  30 .globl ASM_PFX(ArmEnableBranchPrediction)
  31 .globl ASM_PFX(ArmDisableBranchPrediction)
  32 .globl ASM_PFX(ArmV7AllDataCachesOperation)
  33 .globl ASM_PFX(ArmDataMemoryBarrier)
  34 .globl ASM_PFX(ArmDataSyncronizationBarrier)
  35 .globl ASM_PFX(ArmInstructionSynchronizationBarrier)
  36
  37 .text
  38 .align 2
  39
  40 .set DC_ON, (0x1<<2)
  41 .set IC_ON, (0x1<<12)
  42
  43
  44 ASM_PFX(ArmInvalidateDataCacheEntryByMVA):
  45   mcr     p15, 0, r0, c7, c6, 1   @invalidate single data cache line
  46   dsb
  47   isb
  48   bx      lr
  49
  50
  51 ASM_PFX(ArmCleanDataCacheEntryByMVA):
  52   mcr     p15, 0, r0, c7, c10, 1  @clean single data cache line
  53   dsb
  54   isb
  55   bx      lr
  56
  57
  58 ASM_PFX(ArmCleanInvalidateDataCacheEntryByMVA):
  59   mcr     p15, 0, r0, c7, c14, 1  @clean and invalidate single data cache line
  60   dsb
  61   isb
  62   bx      lr
  63
  64
  65 ASM_PFX(ArmInvalidateDataCacheEntryBySetWay):
  66   mcr     p15, 0, r0, c7, c6, 2        @ Invalidate this line
  67   dsb
  68   isb
  69   bx      lr
  70
  71
  72 ASM_PFX(ArmCleanInvalidateDataCacheEntryBySetWay):
  73   mcr     p15, 0, r0, c7, c14, 2       @ Clean and Invalidate this line
  74   dsb
  75   isb
  76   bx      lr
  77
  78
  79 ASM_PFX(ArmCleanDataCacheEntryBySetWay):
  80   mcr     p15, 0, r0, c7, c10, 2       @ Clean this line
  81   dsb
  82   isb
  83   bx      lr
  84
  85
  86 ASM_PFX(ArmDrainWriteBuffer):
  87   mcr     p15, 0, r0, c7, c10, 4       @ Drain write buffer for sync
  88   dsb
  89   isb
  90   bx      lr
  91
  92
  93 ASM_PFX(ArmInvalidateInstructionCache):
  94   mov     R0,#0
  95   mcr     p15,0,R0,c7,c5,0      @Invalidate entire instruction cache
  96   mov     R0,#0
  97   dsb
  98   isb
  99   bx      LR
 100
 101 ASM_PFX(ArmEnableMmu):
 102   mrc     p15,0,R0,c1,c0,0
 103   orr     R0,R0,#1
 104   mcr     p15,0,R0,c1,c0,0
 105   dsb
 106   isb
 107   bx      LR
 108
 109 ASM_PFX(ArmMmuEnabled):
 110   mrc     p15,0,R0,c1,c0,0
 111   and     R0,R0,#1
 112   isb
 113   bx      LR
 114
 115
 116 ASM_PFX(ArmDisableMmu):
 117   mov     R0,#0
 118   mcr     p15,0,R0,c13,c0,0     @FCSE PID register must be cleared before disabling MMU
 119   mrc     p15,0,R0,c1,c0,0
 120   bic     R0,R0,#1
 121   mcr     p15,0,R0,c1,c0,0      @Disable MMU
 122   dsb
 123   isb
 124   bx      LR
 125
 126 ASM_PFX(ArmEnableDataCache):
 127   ldr     R1,=DC_ON
 128   mrc     p15,0,R0,c1,c0,0      @Read control register configuration data
 129   orr     R0,R0,R1              @Set C bit
 130   mcr     p15,0,r0,c1,c0,0      @Write control register configuration data
 131   dsb
 132   isb
 133   bx      LR
 134
 135 ASM_PFX(ArmDisableDataCache):
 136   ldr     R1,=DC_ON
 137   mrc     p15,0,R0,c1,c0,0      @Read control register configuration data
 138   bic     R0,R0,R1              @Clear C bit
 139   mcr     p15,0,r0,c1,c0,0      @Write control register configuration data
 140   dsb
 141   isb
 142   bx      LR
 143
 144 ASM_PFX(ArmEnableInstructionCache):
 145   ldr     R1,=IC_ON
 146   mrc     p15,0,R0,c1,c0,0      @Read control register configuration data
 147   orr     R0,R0,R1              @Set I bit
 148   mcr     p15,0,r0,c1,c0,0      @Write control register configuration data
 149   dsb
 150   isb
 151   bx      LR
 152
 153 ASM_PFX(ArmDisableInstructionCache):
 154   ldr     R1,=IC_ON
 155   mrc     p15,0,R0,c1,c0,0      @Read control register configuration data
 156   bic     R0,R0,R1              @Clear I bit.
 157   mcr     p15,0,r0,c1,c0,0      @Write control register configuration data
 158   dsb
 159   isb
 160   bx      LR
 161
 162 ASM_PFX(ArmEnableBranchPrediction):
 163   mrc     p15, 0, r0, c1, c0, 0
 164   orr     r0, r0, #0x00000800
 165   mcr     p15, 0, r0, c1, c0, 0
 166   dsb
 167   isb
 168   bx      LR
 169
 170 ASM_PFX(ArmDisableBranchPrediction):
 171   mrc     p15, 0, r0, c1, c0, 0
 172   bic     r0, r0, #0x00000800
 173   mcr     p15, 0, r0, c1, c0, 0
 174   dsb
 175   isb
 176   bx      LR
 177
 178
 179 ASM_PFX(ArmV7AllDataCachesOperation):
 180   stmfd SP!,{r4-r12, LR}
 181   mov   R1, R0                @ Save Function call in R1
 182   mrc   p15, 1, R6, c0, c0, 1 @ Read CLIDR
 183   ands  R3, R6, #0x7000000    @ Mask out all but Level of Coherency (LoC)
 184   mov   R3, R3, LSR #23       @ Cache level value (naturally aligned)
 185   beq   L_Finished
 186   mov   R10, #0
 187
 188 Loop1:
 189   add   R2, R10, R10, LSR #1  @ Work out 3xcachelevel
 190   mov   R12, R6, LSR R2       @ bottom 3 bits are the Cache type for this level
 191   and   R12, R12, #7          @ get those 3 bits alone
 192   cmp   R12, #2
 193   blt   L_Skip                  @ no cache or only instruction cache at this level
 194   mcr   p15, 2, R10, c0, c0, 0  @ write the Cache Size selection register (CSSELR) // OR in 1 for Instruction
 195   isb                           @ isb to sync the change to the CacheSizeID reg
 196   mrc   p15, 1, R12, c0, c0, 0  @ reads current Cache Size ID register (CCSIDR)
 197   and   R2, R12, #0x7           @ extract the line length field
 198   add   R2, R2, #4              @ add 4 for the line length offset (log2 16 bytes)
 199 @  ldr   R4, =0x3FF
 200   mov   R4, #0x400
 201   sub   R4, R4, #1
 202   ands  R4, R4, R12, LSR #3     @ R4 is the max number on the way size (right aligned)
 203   clz   R5, R4                  @ R5 is the bit position of the way size increment
 204 @  ldr   R7, =0x00007FFF
 205   mov   R7, #0x00008000
 206   sub   R7, R7, #1
 207   ands  R7, R7, R12, LSR #13    @ R7 is the max number of the index size (right aligned)
 208
 209 Loop2:
 210   mov   R9, R4                  @ R9 working copy of the max way size (right aligned)
 211
 212 Loop3:
 213   orr   R0, R10, R9, LSL R5     @ factor in the way number and cache number into R11
 214   orr   R0, R0, R7, LSL R2      @ factor in the index number
 215
 216   blx   R1
 217
 218   subs  R9, R9, #1              @ decrement the way number
 219   bge   Loop3
 220   subs  R7, R7, #1              @ decrement the index
 221   bge   Loop2
 222 L_Skip:
 223   add   R10, R10, #2            @ increment the cache number
 224   cmp   R3, R10
 225   bgt   Loop1
 226
 227 L_Finished:
 228   ldmfd SP!, {r4-r12, lr}
 229   bx    LR
 230
 231 ASM_PFX(ArmDataMemoryBarrier):
 232   dmb
 233   bx      LR
 234
 235 ASM_PFX(ArmDataSyncronizationBarrier):
 236   dsb
 237   bx      LR
 238
 239 ASM_PFX(ArmInstructionSynchronizationBarrier):
 240   isb
 241   bx      LR
 242
 243
 244 ASM_FUNCTION_REMOVE_IF_UNREFERENCED