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ArmPkg/ArmCpuLib: Replaced complex functions ArmCpuSynchronizeWait & ArmCpuSynchronizeSignal by sev & wfe

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Previsouly the synchronization of MpCore was using the SGI (Software
Generated Interrupt) to synchronize MpCore during the early boot.
This commit replaced this mechanism by the more appropriate SEV/WFE
instructions (Send/Wait Event instructions).
That also eases the port to a new cpu/platform.

Signed-off-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13249 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
oliviermartin
2012-05-02 19:55:32 +00:00
parent f463bb00ad
commit b1d41be7c9
19 changed files with 61 additions and 274 deletions
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8
ArmPlatformPkg/PrePi/PrePi.c
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@@ -14,7 +14,6 @@
#include <PiPei.h>
#include <Library/ArmCpuLib.h>
#include <Library/DebugAgentLib.h>
#include <Library/PrePiLib.h>
#include <Library/PrintLib.h>
@@ -204,11 +203,12 @@ CEntryPoint (
if (IS_PRIMARY_CORE(MpId)) {
mGlobalVariableBase = GlobalVariableBase;
if (ArmIsMpCore()) {
ArmCpuSynchronizeSignal (ARM_CPU_EVENT_DEFAULT);
// Signal the Global Variable Region is defined (event: ARM_CPU_EVENT_DEFAULT)
ArmCallSEV ();
}
} else {
// Wait the Primay core has defined the address of the Global Variable region
ArmCpuSynchronizeWait (ARM_CPU_EVENT_DEFAULT);
// Wait the Primay core has defined the address of the Global Variable region (event: ARM_CPU_EVENT_DEFAULT)
ArmCallWFE ();
}
}