mirror of https://github.com/acidanthera/audk.git
b09c1c6f25
PlatformPei calls GetSystemMemorySizeBelow4gb() in three locations: - PublishPeiMemory(): on normal boot, the permanent PEI RAM is installed so that it ends with the RAM below 4GB, - QemuInitializeRam(): on normal boot, memory resource descriptor HOBs are created for the RAM below 4GB; plus MTRR attributes are set (independently of S3 vs. normal boot) - MemMapInitialization(): an MMIO resource descriptor HOB is created for PCI resource allocation, on normal boot, starting at max(RAM below 4GB, 2GB). The first two of these is adjusted for the configured TSEG size, if PcdSmmSmramRequire is set: - In PublishPeiMemory(), the permanent PEI RAM is kept under TSEG. - In QemuInitializeRam(), we must keep the DXE out of TSEG. One idea would be to simply trim the [1MB .. LowerMemorySize] memory resource descriptor HOB, leaving a hole for TSEG in the memory space map. The SMM IPL will however want to massage the caching attributes of the SMRAM range that it loads the SMM core into, with gDS->SetMemorySpaceAttributes(), and that won't work on a hole. So, instead of trimming this range, split the TSEG area off, and report it as a cacheable reserved memory resource. Finally, since reserved memory can be allocated too, pre-allocate TSEG in InitializeRamRegions(), after QemuInitializeRam() returns. (Note that this step alone does not suffice without the resource descriptor HOB trickery: if we omit that, then the DXE IPL PEIM fails to load and start the DXE core.) - In MemMapInitialization(), the start of the PCI MMIO range is not affected. We choose the largest option (8MB) for the default TSEG size. Michael Kinney pointed out that the SMBASE relocation in PiSmmCpuDxeSmm consumes SMRAM proportionally to the number of CPUs. From the three options available, he reported that 8MB was both necessary and sufficient for the SMBASE relocation to succeed with 255 CPUs: - http://thread.gmane.org/gmane.comp.bios.edk2.devel/3020/focus=3137 - http://thread.gmane.org/gmane.comp.bios.edk2.devel/3020/focus=3177 Cc: Michael Kinney <michael.d.kinney@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Michael Kinney <michael.d.kinney@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19039 6f19259b-4bc3-4df7-8a09-765794883524 |
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| .. | ||
| Cmos.c | ||
| Cmos.h | ||
| Fv.c | ||
| MemDetect.c | ||
| Platform.c | ||
| Platform.h | ||
| PlatformPei.inf | ||
| Xen.c | ||
| Xen.h | ||