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EmulatorPkg: Move magic page to first allocation

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The magic page is allocated from a fixed address specified
by PcdPeiServicesTablePage. This allocation has been observed
to sometimes fail. Move the allocation of this buffer to the
very beginning of main() to minimize the change that another
allocation is allocated from the PcdPeiServicesTablePage
address.

Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
This commit is contained in:
Michael D Kinney 2025-01-22 17:32:30 -08:00 committed by mergify[bot]
parent 54c1460dd0
commit 81802056c8
1 changed files with 22 additions and 22 deletions
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44
EmulatorPkg/Win/Host/WinHost.c
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@ -452,6 +452,28 @@ Returns:
UINTN ResetJumpCode;
EMU_THUNK_PPI *SecEmuThunkPpi;
//
// If enabled use the magic page to communicate between modules
// This replaces the PI PeiServicesTable pointer mechanism that
// deos not work in the emulator. It also allows the removal of
// writable globals from SEC, PEI_CORE (libraries), PEIMs
//
EmuMagicPage = (VOID *)(UINTN)(FixedPcdGet64 (PcdPeiServicesTablePage) & MAX_UINTN);
if (EmuMagicPage != NULL) {
UINT64 Size;
Status = WinNtOpenFile (
NULL,
SIZE_4KB,
0,
&EmuMagicPage,
&Size
);
if (EFI_ERROR (Status)) {
SecPrint ("ERROR : Could not allocate PeiServicesTablePage @ %p\n\r", EmuMagicPage);
return EFI_DEVICE_ERROR;
}
}
//
// Enable the privilege so that RTC driver can successfully run SetTime()
//
@ -575,28 +597,6 @@ Returns:
exit (1);
}
//
// If enabled use the magic page to communicate between modules
// This replaces the PI PeiServicesTable pointer mechanism that
// deos not work in the emulator. It also allows the removal of
// writable globals from SEC, PEI_CORE (libraries), PEIMs
//
EmuMagicPage = (VOID *)(UINTN)(FixedPcdGet64 (PcdPeiServicesTablePage) & MAX_UINTN);
if (EmuMagicPage != NULL) {
UINT64 Size;
Status = WinNtOpenFile (
NULL,
SIZE_4KB,
0,
&EmuMagicPage,
&Size
);
if (EFI_ERROR (Status)) {
SecPrint ("ERROR : Could not allocate PeiServicesTablePage @ %p\n\r", EmuMagicPage);
return EFI_DEVICE_ERROR;
}
}
//
// Open All the firmware volumes and remember the info in the gFdInfo global
// Meanwhile, find the SEC Core.