diff options
Diffstat (limited to 'ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm')
| -rw-r--r-- | ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm index ec2093adc..2e323a1dd 100644 --- a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm +++ b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.asm @@ -21,6 +21,7 @@ EXPORT ArmPlatformPeiBootAction
EXPORT ArmPlatformGetCorePosition
EXPORT ArmPlatformIsPrimaryCore
+ EXPORT ArmPlatformGetPrimaryCoreMpId
PRESERVE8
AREA CTA15A7Helper, CODE, READONLY
@@ -71,4 +72,26 @@ ArmPlatformIsPrimaryCore FUNCTION bx lr
ENDFUNC
+//UINTN
+//ArmPlatformGetPrimaryCoreMpId (
+// VOID
+// );
+ArmPlatformGetPrimaryCoreMpId FUNCTION
+ // Extract cpu_id and cluster_id from ARM_SCC_CFGREG48
+ // with cpu_id[0:3] and cluster_id[4:7]
+ LoadConstantToReg (ARM_CTA15A7_SCC_CFGREG48, r0)
+ ldr r0, [r0]
+ lsr r0, #24
+
+ // Shift the SCC value to get the cluster ID at the offset #8
+ lsl r1, r0, #4
+ and r1, r1, #0xF00
+
+ // Keep only the cpu ID from the original SCC
+ and r0, r0, #0x0F
+ // Add the Cluster ID to the Cpu ID
+ orr r0, r0, r1
+ bx lr
+ ENDFUNC
+
END
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