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
This commit is contained in:
oliviermartin
2012-02-14 18:44:40 +00:00
parent 9207c5d758
commit d60f6af456
7 changed files with 154 additions and 14 deletions

View File

@@ -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