Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3593
Not needed for qemu 1.7 (released in 2013) and newer.
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
OvmfPkg/PlatformPei/MemDetect.c | 58 ++-------------------------------
1 file changed, 3 insertions(+), 55 deletions(-)
diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c
index 20154255324b..8d2c7f432472 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -37,7 +37,6 @@ Module Name:
#include <Library/QemuFwCfgSimpleParserLib.h>
#include "Platform.h"
-#include "Cmos.h"
UINT8 mPhysMemAddressWidth;
@@ -295,52 +294,11 @@ GetSystemMemorySizeBelow4gb (
{
EFI_STATUS Status;
UINT64 LowerMemorySize = 0;
- UINT8 Cmos0x34;
- UINT8 Cmos0x35;
Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL);
- if (Status == EFI_SUCCESS && LowerMemorySize > 0) {
- return LowerMemorySize;
- }
+ ASSERT (Status == EFI_SUCCESS && LowerMemorySize > 0);
+ return LowerMemorySize;
- //
- // CMOS 0x34/0x35 specifies the system memory above 16 MB.
- // * CMOS(0x35) is the high byte
- // * CMOS(0x34) is the low byte
- // * The size is specified in 64kb chunks
- // * Since this is memory above 16MB, the 16MB must be added
- // into the calculation to get the total memory size.
- //
-
- Cmos0x34 = (UINT8) CmosRead8 (0x34);
- Cmos0x35 = (UINT8) CmosRead8 (0x35);
-
- return (UINT32) (((UINTN)((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB);
-}
-
-
-STATIC
-UINT64
-GetSystemMemorySizeAbove4gb (
- )
-{
- UINT32 Size;
- UINTN CmosIndex;
-
- //
- // CMOS 0x5b-0x5d specifies the system memory above 4GB MB.
- // * CMOS(0x5d) is the most significant size byte
- // * CMOS(0x5c) is the middle size byte
- // * CMOS(0x5b) is the least significant size byte
- // * The size is specified in 64kb chunks
- //
-
- Size = 0;
- for (CmosIndex = 0x5d; CmosIndex >= 0x5b; CmosIndex--) {
- Size = (UINT32) (Size << 8) + (UINT32) CmosRead8 (CmosIndex);
- }
-
- return LShiftU64 (Size, 16);
}
@@ -371,12 +329,9 @@ GetFirstNonAddress (
// If QEMU presents an E820 map, then get the highest exclusive >=4GB RAM
// address from it. This can express an address >= 4GB+1TB.
//
- // Otherwise, get the flat size of the memory above 4GB from the CMOS (which
- // can only express a size smaller than 1TB), and add it to 4GB.
- //
Status = ScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress);
if (EFI_ERROR (Status)) {
- FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb ();
+ FirstNonAddress = BASE_4GB;
}
//
@@ -719,7 +674,6 @@ QemuInitializeRam (
)
{
UINT64 LowerMemorySize;
- UINT64 UpperMemorySize;
MTRR_SETTINGS MtrrSettings;
EFI_STATUS Status;
@@ -775,12 +729,6 @@ QemuInitializeRam (
// memory size read from the CMOS.
//
Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL);
- if (EFI_ERROR (Status)) {
- UpperMemorySize = GetSystemMemorySizeAbove4gb ();
- if (UpperMemorySize != 0) {
- AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize);
- }
- }
}
//
--
2.31.1
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On Thu, 26 Aug 2021 at 11:55, Gerd Hoffmann <kraxel@redhat.com> wrote: > > Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3593 > > Not needed for qemu 1.7 (released in 2013) and newer. > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> > --- > OvmfPkg/PlatformPei/MemDetect.c | 58 ++------------------------------- > 1 file changed, 3 insertions(+), 55 deletions(-) > > diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c > index 20154255324b..8d2c7f432472 100644 > --- a/OvmfPkg/PlatformPei/MemDetect.c > +++ b/OvmfPkg/PlatformPei/MemDetect.c > @@ -37,7 +37,6 @@ Module Name: > #include <Library/QemuFwCfgSimpleParserLib.h> > > #include "Platform.h" > -#include "Cmos.h" > > UINT8 mPhysMemAddressWidth; > > @@ -295,52 +294,11 @@ GetSystemMemorySizeBelow4gb ( > { > EFI_STATUS Status; > UINT64 LowerMemorySize = 0; > - UINT8 Cmos0x34; > - UINT8 Cmos0x35; > > Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL); > - if (Status == EFI_SUCCESS && LowerMemorySize > 0) { > - return LowerMemorySize; > - } > + ASSERT (Status == EFI_SUCCESS && LowerMemorySize > 0); Nit: better to do ASSERT_EFI_ERROR (Status); ASSERT (LowerMemorySize > 0); so that you can tell from the debug log which condition triggered, and if it is the first one, what the actual error code was. > + return LowerMemorySize; > > - // > - // CMOS 0x34/0x35 specifies the system memory above 16 MB. > - // * CMOS(0x35) is the high byte > - // * CMOS(0x34) is the low byte > - // * The size is specified in 64kb chunks > - // * Since this is memory above 16MB, the 16MB must be added > - // into the calculation to get the total memory size. > - // > - > - Cmos0x34 = (UINT8) CmosRead8 (0x34); > - Cmos0x35 = (UINT8) CmosRead8 (0x35); > - > - return (UINT32) (((UINTN)((Cmos0x35 << 8) + Cmos0x34) << 16) + SIZE_16MB); > -} > - > - > -STATIC > -UINT64 > -GetSystemMemorySizeAbove4gb ( > - ) > -{ > - UINT32 Size; > - UINTN CmosIndex; > - > - // > - // CMOS 0x5b-0x5d specifies the system memory above 4GB MB. > - // * CMOS(0x5d) is the most significant size byte > - // * CMOS(0x5c) is the middle size byte > - // * CMOS(0x5b) is the least significant size byte > - // * The size is specified in 64kb chunks > - // > - > - Size = 0; > - for (CmosIndex = 0x5d; CmosIndex >= 0x5b; CmosIndex--) { > - Size = (UINT32) (Size << 8) + (UINT32) CmosRead8 (CmosIndex); > - } > - > - return LShiftU64 (Size, 16); > } > > > @@ -371,12 +329,9 @@ GetFirstNonAddress ( > // If QEMU presents an E820 map, then get the highest exclusive >=4GB RAM > // address from it. This can express an address >= 4GB+1TB. > // > - // Otherwise, get the flat size of the memory above 4GB from the CMOS (which > - // can only express a size smaller than 1TB), and add it to 4GB. > - // > Status = ScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress); > if (EFI_ERROR (Status)) { > - FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb (); > + FirstNonAddress = BASE_4GB; > } > > // > @@ -719,7 +674,6 @@ QemuInitializeRam ( > ) > { > UINT64 LowerMemorySize; > - UINT64 UpperMemorySize; > MTRR_SETTINGS MtrrSettings; > EFI_STATUS Status; > > @@ -775,12 +729,6 @@ QemuInitializeRam ( > // memory size read from the CMOS. > // > Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL); > - if (EFI_ERROR (Status)) { > - UpperMemorySize = GetSystemMemorySizeAbove4gb (); > - if (UpperMemorySize != 0) { > - AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize); > - } > - } > } > > // > -- > 2.31.1 > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#79842): https://edk2.groups.io/g/devel/message/79842 Mute This Topic: https://groups.io/mt/85157660/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=-=-=-=-=-=-=-=-=-=-=-
Good idea, Ard. > ASSERT_EFI_ERROR (Status); > ASSERT (LowerMemorySize > 0); I like this suggestion. Thank you Yao Jiewen > -----Original Message----- > From: Ard Biesheuvel <ardb@kernel.org> > Sent: Thursday, August 26, 2021 7:15 PM > To: Gerd Hoffmann <kraxel@redhat.com> > Cc: edk2-devel-groups-io <devel@edk2.groups.io>; Ard Biesheuvel > <ardb+tianocore@kernel.org>; Yao, Jiewen <jiewen.yao@intel.com>; Justen, > Jordan L <jordan.l.justen@intel.com>; Philippe Mathieu-Daude > <philmd@redhat.com> > Subject: Re: [PATCH v2 3/3] RFC: OvmfPkg/PlatformPei: stop using cmos for > memory detection > > On Thu, 26 Aug 2021 at 11:55, Gerd Hoffmann <kraxel@redhat.com> wrote: > > > > Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3593 > > > > Not needed for qemu 1.7 (released in 2013) and newer. > > > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> > > --- > > OvmfPkg/PlatformPei/MemDetect.c | 58 ++------------------------------- > > 1 file changed, 3 insertions(+), 55 deletions(-) > > > > diff --git a/OvmfPkg/PlatformPei/MemDetect.c > b/OvmfPkg/PlatformPei/MemDetect.c > > index 20154255324b..8d2c7f432472 100644 > > --- a/OvmfPkg/PlatformPei/MemDetect.c > > +++ b/OvmfPkg/PlatformPei/MemDetect.c > > @@ -37,7 +37,6 @@ Module Name: > > #include <Library/QemuFwCfgSimpleParserLib.h> > > > > #include "Platform.h" > > -#include "Cmos.h" > > > > UINT8 mPhysMemAddressWidth; > > > > @@ -295,52 +294,11 @@ GetSystemMemorySizeBelow4gb ( > > { > > EFI_STATUS Status; > > UINT64 LowerMemorySize = 0; > > - UINT8 Cmos0x34; > > - UINT8 Cmos0x35; > > > > Status = ScanOrAdd64BitE820Ram (FALSE, &LowerMemorySize, NULL); > > - if (Status == EFI_SUCCESS && LowerMemorySize > 0) { > > - return LowerMemorySize; > > - } > > + ASSERT (Status == EFI_SUCCESS && LowerMemorySize > 0); > > Nit: better to do > > ASSERT_EFI_ERROR (Status); > ASSERT (LowerMemorySize > 0); > > so that you can tell from the debug log which condition triggered, and > if it is the first one, what the actual error code was. > > > > + return LowerMemorySize; > > > > - // > > - // CMOS 0x34/0x35 specifies the system memory above 16 MB. > > - // * CMOS(0x35) is the high byte > > - // * CMOS(0x34) is the low byte > > - // * The size is specified in 64kb chunks > > - // * Since this is memory above 16MB, the 16MB must be added > > - // into the calculation to get the total memory size. > > - // > > - > > - Cmos0x34 = (UINT8) CmosRead8 (0x34); > > - Cmos0x35 = (UINT8) CmosRead8 (0x35); > > - > > - return (UINT32) (((UINTN)((Cmos0x35 << 8) + Cmos0x34) << 16) + > SIZE_16MB); > > -} > > - > > - > > -STATIC > > -UINT64 > > -GetSystemMemorySizeAbove4gb ( > > - ) > > -{ > > - UINT32 Size; > > - UINTN CmosIndex; > > - > > - // > > - // CMOS 0x5b-0x5d specifies the system memory above 4GB MB. > > - // * CMOS(0x5d) is the most significant size byte > > - // * CMOS(0x5c) is the middle size byte > > - // * CMOS(0x5b) is the least significant size byte > > - // * The size is specified in 64kb chunks > > - // > > - > > - Size = 0; > > - for (CmosIndex = 0x5d; CmosIndex >= 0x5b; CmosIndex--) { > > - Size = (UINT32) (Size << 8) + (UINT32) CmosRead8 (CmosIndex); > > - } > > - > > - return LShiftU64 (Size, 16); > > } > > > > > > @@ -371,12 +329,9 @@ GetFirstNonAddress ( > > // If QEMU presents an E820 map, then get the highest exclusive >=4GB RAM > > // address from it. This can express an address >= 4GB+1TB. > > // > > - // Otherwise, get the flat size of the memory above 4GB from the CMOS > (which > > - // can only express a size smaller than 1TB), and add it to 4GB. > > - // > > Status = ScanOrAdd64BitE820Ram (FALSE, NULL, &FirstNonAddress); > > if (EFI_ERROR (Status)) { > > - FirstNonAddress = BASE_4GB + GetSystemMemorySizeAbove4gb (); > > + FirstNonAddress = BASE_4GB; > > } > > > > // > > @@ -719,7 +674,6 @@ QemuInitializeRam ( > > ) > > { > > UINT64 LowerMemorySize; > > - UINT64 UpperMemorySize; > > MTRR_SETTINGS MtrrSettings; > > EFI_STATUS Status; > > > > @@ -775,12 +729,6 @@ QemuInitializeRam ( > > // memory size read from the CMOS. > > // > > Status = ScanOrAdd64BitE820Ram (TRUE, NULL, NULL); > > - if (EFI_ERROR (Status)) { > > - UpperMemorySize = GetSystemMemorySizeAbove4gb (); > > - if (UpperMemorySize != 0) { > > - AddMemoryBaseSizeHob (BASE_4GB, UpperMemorySize); > > - } > > - } > > } > > > > // > > -- > > 2.31.1 > > -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#79850): https://edk2.groups.io/g/devel/message/79850 Mute This Topic: https://groups.io/mt/85157660/1787277 Group Owner: devel+owner@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [importer@patchew.org] -=-=-=-=-=-=-=-=-=-=-=-
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