ArmPkg/Library/ArmLib/Common/ArmLibSupport.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   4 #
   5 # 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 .text
  16 .align 2
  17 .globl ASM_PFX(Cp15IdCode)
  18 .globl ASM_PFX(Cp15CacheInfo)
  19 .globl ASM_PFX(ArmEnableInterrupts)
  20 .globl ASM_PFX(ArmDisableInterrupts)
  21 .globl ASM_PFX(ArmGetInterruptState)
  22 .globl ASM_PFX(ArmEnableFiq)
  23 .globl ASM_PFX(ArmDisableFiq)
  24 .globl ASM_PFX(ArmGetFiqState)
  25 .globl ASM_PFX(ArmInvalidateTlb)
  26 .globl ASM_PFX(ArmSetTranslationTableBaseAddress)
  27 .globl ASM_PFX(ArmGetTranslationTableBaseAddress)
  28 .globl ASM_PFX(ArmSetDomainAccessControl)
  29 .globl ASM_PFX(CPSRMaskInsert)
  30 .globl ASM_PFX(CPSRRead)
  31
  32 #------------------------------------------------------------------------------
  33
  34 ASM_PFX(Cp15IdCode):
  35   mrc     p15,0,R0,c0,c0,0
  36   bx      LR
  37
  38 ASM_PFX(Cp15CacheInfo):
  39   mrc     p15,0,R0,c0,c0,1
  40   bx      LR
  41
  42 ASM_PFX(ArmEnableInterrupts):
  43         mrs     R0,CPSR
  44         bic     R0,R0,#0x80             @Enable IRQ interrupts
  45         msr     CPSR_c,R0
  46         bx      LR
  47
  48 ASM_PFX(ArmDisableInterrupts):
  49         mrs     R0,CPSR
  50         orr     R1,R0,#0x80             @Disable IRQ interrupts
  51         msr     CPSR_c,R1
  52   tst     R0,#0x80
  53   moveq   R0,#1
  54   movne   R0,#0
  55         bx      LR
  56
  57 ASM_PFX(ArmGetInterruptState):
  58         mrs     R0,CPSR
  59         tst     R0,#0x80            @Check if IRQ is enabled.
  60         moveq   R0,#1
  61         movne   R0,#0
  62         bx      LR
  63
  64 ASM_PFX(ArmEnableFiq):
  65         mrs     R0,CPSR
  66         bic     R0,R0,#0x40             @Enable FIQ interrupts
  67         msr     CPSR_c,R0
  68         bx      LR
  69
  70 ASM_PFX(ArmDisableFiq):
  71         mrs     R0,CPSR
  72         orr     R1,R0,#0x40             @Disable FIQ interrupts
  73         msr     CPSR_c,R1
  74   tst     R0,#0x80
  75   moveq   R0,#1
  76   movne   R0,#0
  77         bx      LR
  78
  79 ASM_PFX(ArmGetFiqState):
  80         mrs     R0,CPSR
  81         tst     R0,#0x80            @Check if FIQ is enabled.
  82         moveq   R0,#1
  83         movne   R0,#0
  84         bx      LR
  85
  86 ASM_PFX(ArmInvalidateTlb):
  87   mov     r0,#0
  88   mcr     p15,0,r0,c8,c7,0
  89   bx      lr
  90
  91 ASM_PFX(ArmSetTranslationTableBaseAddress):
  92   mcr     p15,0,r0,c2,c0,0
  93   bx      lr
  94
  95 ASM_PFX(ArmGetTranslationTableBaseAddress):
  96   mrc     p15,0,r0,c2,c0,0
  97   bx      lr
  98
  99
 100 ASM_PFX(ArmSetDomainAccessControl):
 101   mcr     p15,0,r0,c3,c0,0
 102   bx      lr
 103
 104 ASM_PFX(CPSRMaskInsert):    @ on entry, r0 is the mask and r1 is the field to insert
 105   stmfd   sp!, {r4-r12, lr} @ save all the banked registers
 106   mov     r3, sp            @ copy the stack pointer into a non-banked register
 107   mrs     r2, cpsr          @ read the cpsr
 108   bic     r2, r2, r0        @ clear mask in the cpsr
 109   and     r1, r1, r0        @ clear bits outside the mask in the input
 110   orr     r2, r2, r1        @ set field
 111   msr     cpsr_cxsf, r2     @ write back cpsr (may have caused a mode switch)
 112   mov     sp, r3            @ restore stack pointer
 113   ldmfd   sp!, {r4-r12, lr} @ restore registers
 114   bx      lr                @ return (hopefully thumb-safe!)
 115
 116 ASM_PFX(CPSRRead):
 117   mrs     r0, cpsr
 118   bx      lr
 119
 120 ASM_FUNCTION_REMOVE_IF_UNREFERENCED