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Check if active video mode is changed after OpROM starts, if active video mode is not changed, skip INT10 calls to improve performance.

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Signed-off-by: Li Elvin <elvin.li@intel.com>
Reviewed-by: Yao Jiewen<jiewen.yao@intel.com>


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13609 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
li-elvin
2012-08-13 09:33:49 +00:00
parent e27ad65778
commit edf4af6fb9
2 changed files with 10 additions and 4 deletions
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13
IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c
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@@ -2380,7 +2380,7 @@ LegacyBiosInstallRom (
//
// Store current mode settings since PrepareToScanRom may change mode.
//
VideoMode = *(UINT8 *) ((UINTN) 0x449);
VideoMode = *(UINT8 *) ((UINTN) (0x400 + BDA_VIDEO_MODE));
}
//
// Notify the platform that we are about to scan the ROM
@@ -2520,9 +2520,14 @@ LegacyBiosInstallRom (
//
// Set mode settings since PrepareToScanRom may change mode
//
Regs.H.AH = 0x00;
Regs.H.AL = VideoMode;
Private->LegacyBios.Int86 (&Private->LegacyBios, 0x10, &Regs);
if (VideoMode != *(UINT8 *) ((UINTN) (0x400 + BDA_VIDEO_MODE))) {
//
// The active video mode is changed, restore it to original mode.
//
Regs.H.AH = 0x00;
Regs.H.AL = VideoMode;
Private->LegacyBios.Int86 (&Private->LegacyBios, 0x10, &Regs);
}
}
//
// Regs.X.AX from the adapter initializion is ignored since some adapters