From: Scott Duplichan <sc...@notabs.org>
The SegmentC local variable has type EFI_PHYSICAL_ADDRESS for (justified)
style reasons. However, the 64-bit bit-shifts that it undergoes result in
intrinsic calls when built with VS2010 for Ia32 / NOOPT.
The concrete value of SegmentC, 0xC0000, and the results of the bitops
that are based on it, are statically computeable. Cast SegmentC to UINT32
before subjecting it to bitwise operations; we can see in advance that
this won't lead to range loss.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Scott Duplichan <sc...@notabs.org>
[ler...@redhat.com: dropped now superfluous outermost parens; commit msg]
Signed-off-by: Laszlo Ersek <ler...@redhat.com>
---
OvmfPkg/QemuVideoDxe/VbeShim.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/OvmfPkg/QemuVideoDxe/VbeShim.c b/OvmfPkg/QemuVideoDxe/VbeShim.c
index 81c1166..6bb175b 100644
--- a/OvmfPkg/QemuVideoDxe/VbeShim.c
+++ b/OvmfPkg/QemuVideoDxe/VbeShim.c
@@ -153,13 +153,13 @@ InstallVbeShim (
CopyMem (VbeInfo->Signature, "VESA", 4);
VbeInfo->VesaVersion = 0x0300;
- VbeInfo->OemNameAddress = (UINT32)(SegmentC << 12 | (UINT16)(UINTN)Ptr);
+ VbeInfo->OemNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
CopyMem (Ptr, "QEMU", 5);
Ptr += 5;
VbeInfo->Capabilities = BIT0; // DAC can be switched into 8-bit mode
- VbeInfo->ModeListAddress = (UINT32)(SegmentC << 12 | (UINT16)(UINTN)Ptr);
+ VbeInfo->ModeListAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
*(UINT16*)Ptr = 0x00f1; // mode number
Ptr += 2;
*(UINT16*)Ptr = 0xFFFF; // mode list terminator
@@ -168,17 +168,17 @@ InstallVbeShim (
VbeInfo->VideoMem64K = (UINT16)((1024 * 768 * 4 + 65535) / 65536);
VbeInfo->OemSoftwareVersion = 0x0000;
- VbeInfo->VendorNameAddress = (UINT32)(SegmentC << 12 | (UINT16)(UINTN)Ptr);
+ VbeInfo->VendorNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
CopyMem (Ptr, "OVMF", 5);
Ptr += 5;
- VbeInfo->ProductNameAddress = (UINT32)(SegmentC << 12 | (UINT16)(UINTN)Ptr);
+ VbeInfo->ProductNameAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
Printed = AsciiSPrint ((CHAR8 *)Ptr,
sizeof VbeInfoFull->Buffer - (Ptr - VbeInfoFull->Buffer), "%s",
CardName);
Ptr += Printed + 1;
- VbeInfo->ProductRevAddress = (UINT32)(SegmentC << 12 | (UINT16)(UINTN)Ptr);
+ VbeInfo->ProductRevAddress = (UINT32)SegmentC << 12 | (UINT16)(UINTN)Ptr;
CopyMem (Ptr, mProductRevision, sizeof mProductRevision);
Ptr += sizeof mProductRevision;
@@ -268,7 +268,7 @@ InstallVbeShim (
//
// Second, point the Int10h vector at the shim.
//
- Int0x10->Segment = (UINT16) (SegmentC >> 4);
+ Int0x10->Segment = (UINT16) ((UINT32)SegmentC >> 4);
Int0x10->Offset = (UINT16) ((UINTN) (VbeModeInfo + 1) - SegmentC);
DEBUG ((EFI_D_INFO, "%a: VBE shim installed\n", __FUNCTION__));
--
1.8.3.1
------------------------------------------------------------------------------
Comprehensive Server Monitoring with Site24x7.
Monitor 10 servers for $9/Month.
Get alerted through email, SMS, voice calls or mobile push notifications.
Take corrective actions from your mobile device.
http://pubads.g.doubleclick.net/gampad/clk?id=154624111&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
