bba9d16231
This patch is inspired by InterlockedCompareExchange32 from the BaseSynchronizationLib. The function will be used in the "OvmfPkg/XenBusDxe: Add Grant Table functions" patch. Change in V3: - Implement both .S and .asm, to get rid of GCC specific asm. - Implement 32bit part of the assembly Change in V2: - Add intel compilation code MSFT code is not compied over because I don't know how it works. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16263 6f19259b-4bc3-4df7-8a09-765794883524
16 lines
411 B
ArmAsm
16 lines
411 B
ArmAsm
# UINT16
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# EFIAPI
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# InternalSyncCompareExchange16 (
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# IN volatile UINT16 *Value,
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# IN UINT16 CompareValue,
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# IN UINT16 ExchangeValue
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# );
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ASM_GLOBAL ASM_PFX(InternalSyncCompareExchange16)
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ASM_PFX(InternalSyncCompareExchange16):
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mov 4(%esp), %ecx
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mov 8(%esp), %eax
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mov 12(%esp), %edx
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lock
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cmpxchgw %dx, (%ecx)
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ret
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