diff options
Diffstat (limited to 'ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S')
| -rw-r--r-- | ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S index b560f56c51..ac5378a622 100644 --- a/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S +++ b/ArmPlatformPkg/ArmVExpressPkg/Library/ArmVExpressLibCTA15-A7/CTA15-A7Helper.S @@ -22,6 +22,7 @@ GCC_ASM_EXPORT(ArmPlatformPeiBootAction)
GCC_ASM_EXPORT(ArmPlatformGetCorePosition)
GCC_ASM_EXPORT(ArmPlatformIsPrimaryCore)
+GCC_ASM_EXPORT(ArmPlatformGetPrimaryCoreMpId)
ASM_PFX(ArmPlatformPeiBootAction):
bx lr
@@ -66,3 +67,23 @@ ASM_PFX(ArmPlatformIsPrimaryCore): movne r0, #0
bx lr
+//UINTN
+//ArmPlatformGetPrimaryCoreMpId (
+// VOID
+// );
+ASM_PFX(ArmPlatformGetPrimaryCoreMpId):
+ // 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
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