ArmPkg/ArmV7Lib: Add support for Invalid Instruction Cache to Point of Unification

This patch adds support to invalidate Instruction Cache to the Point of Unification (PoU).

Signed-off-by: eugenecohen
Reviewed-by: oliviermartin



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13012 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Include/Library/ArmLib.h

@@ -190,6 +190,12 @@ ArmCleanDataCache (
   VOID
   );
 
+VOID
+EFIAPI
+ArmCleanDataCacheToPoU (
+  VOID
+  );
+
 VOID
 EFIAPI
 ArmInvalidateInstructionCache (

ArmPkg/Library/ArmCacheMaintenanceLib/ArmCacheMaintenanceLib.c

@@ -68,7 +68,7 @@ InvalidateInstructionCacheRange (
   IN      UINTN                     Length
   )
 {
-  CacheRangeOperation(Address, Length, ArmCleanDataCache, ArmCleanDataCacheEntryByMVA);
+  CacheRangeOperation (Address, Length, ArmCleanDataCacheToPoU, ArmCleanDataCacheEntryByMVA);
   ArmInvalidateInstructionCache ();
   return Address;
 }

ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.c

@@ -198,7 +198,6 @@ ArmV7DataCacheOperation (
   SavedInterruptState = ArmGetInterruptState ();
   ArmDisableInterrupts ();
   
-
   ArmV7AllDataCachesOperation (DataCacheOperation);
   
   ArmDrainWriteBuffer ();
@@ -208,6 +207,26 @@ ArmV7DataCacheOperation (
   }
 }
 
+
+VOID
+ArmV7PoUDataCacheOperation (
+  IN  ARM_V7_CACHE_OPERATION  DataCacheOperation
+  )
+{
+  UINTN     SavedInterruptState;
+
+  SavedInterruptState = ArmGetInterruptState ();
+  ArmDisableInterrupts ();
+  
+  ArmV7PerformPoUDataCacheOperation (DataCacheOperation);
+  
+  ArmDrainWriteBuffer ();
+  
+  if (SavedInterruptState) {
+    ArmEnableInterrupts ();
+  }
+}
+
 VOID
 EFIAPI
 ArmInvalidateDataCache (
@@ -235,3 +254,11 @@ ArmCleanDataCache (
   ArmV7DataCacheOperation (ArmCleanDataCacheEntryBySetWay);
 }
 
+VOID
+EFIAPI
+ArmCleanDataCacheToPoU (
+  VOID
+  )
+{
+  ArmV7PoUDataCacheOperation (ArmCleanDataCacheEntryBySetWay);
+}

ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.h

@@ -15,6 +15,7 @@
 #ifndef __ARM_V7_LIB_H__
 #define __ARM_V7_LIB_H__
 
+typedef VOID (*ARM_V7_CACHE_OPERATION)(UINT32);
 
 VOID
 EFIAPI
@@ -34,6 +35,12 @@ ArmCleanDataCacheEntryBySetWay (
   IN  UINT32  SetWayFormat
   );
 
+VOID
+EFIAPI
+ArmCleanDataCacheToPoUEntryBySetWay (
+  IN  UINT32  SetWayFormat
+  );
+
 VOID
 EFIAPI
 ArmCleanInvalidateDataCacheEntryBySetWay (
@@ -76,5 +83,15 @@ ArmDisableFiq (
   VOID
   );
 
+VOID
+ArmV7PerformPoUDataCacheOperation (
+  IN  ARM_V7_CACHE_OPERATION  DataCacheOperation
+  );
+
+VOID
+ArmV7AllDataCachesOperation (
+  IN  ARM_V7_CACHE_OPERATION  DataCacheOperation
+  );
+  
 #endif // __ARM_V7_LIB_H__
 

ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.S

@@ -38,6 +38,7 @@ GCC_ASM_EXPORT (ArmDisableBranchPrediction)
 GCC_ASM_EXPORT (ArmSetLowVectors)
 GCC_ASM_EXPORT (ArmSetHighVectors)
 GCC_ASM_EXPORT (ArmV7AllDataCachesOperation)
+GCC_ASM_EXPORT (ArmV7PerformPoUDataCacheOperation)
 GCC_ASM_EXPORT (ArmDataMemoryBarrier)
 GCC_ASM_EXPORT (ArmDataSyncronizationBarrier)
 GCC_ASM_EXPORT (ArmInstructionSynchronizationBarrier)
@@ -267,6 +268,55 @@ L_Finished:
   ldmfd SP!, {r4-r12, lr}
   bx    LR
 
+ASM_PFX(ArmV7PerformPoUDataCacheOperation):
+  stmfd SP!,{r4-r12, LR}
+  mov   R1, R0                @ Save Function call in R1
+  mrc   p15, 1, R6, c0, c0, 1 @ Read CLIDR
+  ands  R3, R6, #0x38000000    @ Mask out all but Level of Unification (LoU)
+  mov   R3, R3, LSR #26       @ Cache level value (naturally aligned)
+  beq   Finished2
+  mov   R10, #0
+
+Loop4:
+  add   R2, R10, R10, LSR #1    @ Work out 3xcachelevel
+  mov   R12, R6, LSR R2         @ bottom 3 bits are the Cache type for this level
+  and   R12, R12, #7            @ get those 3 bits alone
+  cmp   R12, #2
+  blt   Skip2                   @ no cache or only instruction cache at this level
+  mcr   p15, 2, R10, c0, c0, 0  @ write the Cache Size selection register (CSSELR) // OR in 1 for Instruction
+  isb                           @ isb to sync the change to the CacheSizeID reg 
+  mrc   p15, 1, R12, c0, c0, 0  @ reads current Cache Size ID register (CCSIDR)
+  and   R2, R12, #0x7            @ extract the line length field
+  add   R2, R2, #4              @ add 4 for the line length offset (log2 16 bytes)
+  ldr   R4, =0x3FF
+  ands  R4, R4, R12, LSR #3     @ R4 is the max number on the way size (right aligned)
+  clz   R5, R4                  @ R5 is the bit position of the way size increment
+  ldr   R7, =0x00007FFF
+  ands  R7, R7, R12, LSR #13    @ R7 is the max number of the index size (right aligned)
+
+Loop5:
+  mov   R9, R4                  @ R9 working copy of the max way size (right aligned)
+
+Loop6:
+  orr   R0, R10, R9, LSL R5     @ factor in the way number and cache number into R11
+  orr   R0, R0, R7, LSL R2      @ factor in the index number
+
+  blx   R1
+
+  subs  R9, R9, #1              @ decrement the way number
+  bge   Loop6
+  subs  R7, R7, #1              @ decrement the index
+  bge   Loop5
+Skip2:
+  add   R10, R10, #2            @ increment the cache number
+  cmp   R3, R10
+  bgt   Loop4
+  
+Finished2:
+  dsb
+  ldmfd SP!, {r4-r12, lr}
+  bx    LR
+
 ASM_PFX(ArmDataMemoryBarrier):
   dmb
   bx      LR

ArmPkg/Library/ArmLib/ArmV7/ArmV7Support.asm

@@ -35,6 +35,7 @@
     EXPORT  ArmSetLowVectors
     EXPORT  ArmSetHighVectors
     EXPORT  ArmV7AllDataCachesOperation
+    EXPORT  ArmV7PerformPoUDataCacheOperation
     EXPORT  ArmDataMemoryBarrier
     EXPORT  ArmDataSyncronizationBarrier
     EXPORT  ArmInstructionSynchronizationBarrier
@@ -261,6 +262,55 @@ Finished
   ldmfd SP!, {r4-r12, lr}
   bx    LR
 
+ArmV7PerformPoUDataCacheOperation
+  stmfd SP!,{r4-r12, LR}
+  mov   R1, R0                ; Save Function call in R1
+  mrc   p15, 1, R6, c0, c0, 1 ; Read CLIDR
+  ands  R3, R6, #&38000000    ; Mask out all but Level of Unification (LoU)
+  mov   R3, R3, LSR #26       ; Cache level value (naturally aligned)
+  beq   Finished2
+  mov   R10, #0
+
+Loop4   
+  add   R2, R10, R10, LSR #1    ; Work out 3xcachelevel
+  mov   R12, R6, LSR R2         ; bottom 3 bits are the Cache type for this level
+  and   R12, R12, #7            ; get those 3 bits alone
+  cmp   R12, #2
+  blt   Skip2                   ; no cache or only instruction cache at this level
+  mcr   p15, 2, R10, c0, c0, 0  ; write the Cache Size selection register (CSSELR) // OR in 1 for Instruction
+  isb                           ; isb to sync the change to the CacheSizeID reg 
+  mrc   p15, 1, R12, c0, c0, 0  ; reads current Cache Size ID register (CCSIDR)
+  and   R2, R12, #&7            ; extract the line length field
+  add   R2, R2, #4              ; add 4 for the line length offset (log2 16 bytes)
+  ldr   R4, =0x3FF
+  ands  R4, R4, R12, LSR #3     ; R4 is the max number on the way size (right aligned)
+  clz   R5, R4                  ; R5 is the bit position of the way size increment
+  ldr   R7, =0x00007FFF
+  ands  R7, R7, R12, LSR #13    ; R7 is the max number of the index size (right aligned)
+
+Loop5   
+  mov   R9, R4                  ; R9 working copy of the max way size (right aligned)
+
+Loop6   
+  orr   R0, R10, R9, LSL R5     ; factor in the way number and cache number into R11
+  orr   R0, R0, R7, LSL R2      ; factor in the index number
+
+  blx   R1
+
+  subs  R9, R9, #1              ; decrement the way number
+  bge   Loop6
+  subs  R7, R7, #1              ; decrement the index
+  bge   Loop5
+Skip2  
+  add   R10, R10, #2            ; increment the cache number
+  cmp   R3, R10
+  bgt   Loop4
+  
+Finished2
+  dsb
+  ldmfd SP!, {r4-r12, lr}
+  bx    LR
+
 ArmDataMemoryBarrier
   dmb
   bx      LR

ArmPkg/Library/ArmLib/Common/ArmLibPrivate.h

@@ -56,8 +56,6 @@
 #define CACHE_ARCHITECTURE_UNIFIED            (0UL)
 #define CACHE_ARCHITECTURE_SEPARATE           (1UL)
 
-typedef VOID (*ARM_V7_CACHE_OPERATION)(UINT32);
-
 VOID
 CPSRMaskInsert (
   IN  UINT32  Mask,
@@ -69,22 +67,14 @@ CPSRRead (
   VOID
   );
 
-
 UINT32 
 ReadCCSIDR (
   IN UINT32 CSSELR
   );  
   
-
 UINT32
 ReadCLIDR (
   VOID
   );
 
-VOID
-ArmV7AllDataCachesOperation (
-  IN  ARM_V7_CACHE_OPERATION  DataCacheOperation
-  );
-
-
 #endif // __ARM_LIB_PRIVATE_H__