diff options
Diffstat (limited to 'IntelFrameworkModulePkg/Csm/LegacyBiosDxe')
| -rw-r--r-- | IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h | 1 | ||||
| -rw-r--r-- | IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c | 13 |
2 files changed, 10 insertions, 4 deletions
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h index f2e4bbf..7e1a606 100644 --- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h +++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBiosInterface.h @@ -132,6 +132,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. #define LEGACY_PCI_TRACE_00E LEGACY_PCI_TRACE + 0x0E
#define LEGACY_PCI_TRACE_00F LEGACY_PCI_TRACE + 0x0F
+#define BDA_VIDEO_MODE 0x49
typedef struct {
UINTN PciSegment;
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c index 45cdd03..1d09bb8 100644 --- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c +++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyPci.c @@ -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
|