X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=UefiCpuPkg%2FLibrary%2FMpInitLib%2FIa32%2FMpFuncs.nasm;h=2b6c27d4ec675f6389436ce3862b01b22284a5b1;hb=147fd35c3e389ecd025dbfd243312bf5b22da7c9;hp=1b9c6a62f8fe9320b545b826af94f0eef45cf0b0;hpb=37676b9f82ab17bb043a0901d054cd8ab519543c;p=mirror_edk2.git

diff --git a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
index 1b9c6a62f8..2b6c27d4ec 100644
--- a/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
+++ b/UefiCpuPkg/Library/MpInitLib/Ia32/MpFuncs.nasm
@@ -86,6 +86,12 @@ Flat32Start:                                   ; protected mode entry point
 
     mov        esi, ebx
 
+    ; Increment the number of APs executing here as early as possible
+    ; This is decremented in C code when AP is finished executing
+    mov        edi, esi
+    add        edi, NumApsExecutingLocation
+    lock inc   dword [edi]
+
     mov         edi, esi
     add         edi, EnableExecuteDisableLocation
     cmp         byte [edi], 0