| From 07742664925f8d055505220258f2589a9c73a80b Mon Sep 17 00:00:00 2001 |
| From: ReddestDream <reddestdream@gmail.com> |
| Date: Wed, 3 May 2017 00:13:28 -0400 |
| Subject: [PATCH] CbSupportPei: prevent lower coreboot table from being |
| overwritten |
| |
| Exclude the bottom 4kb from being included in System Memory HoB |
| |
| diff --git a/CorebootModulePkg/CbSupportPei/CbSupportPei.c b/CorebootModulePkg/CbSupportPei/CbSupportPei.c |
| index 262e6b9d7d..da8f060783 100755 |
| --- a/CorebootModulePkg/CbSupportPei/CbSupportPei.c |
| +++ b/CorebootModulePkg/CbSupportPei/CbSupportPei.c |
| @@ -246,23 +246,20 @@ CbPeiEntryPoint ( |
| UINTN PmGpeEnBase;
|
| CB_MEM_INFO CbMemInfo;
|
|
|
| - //
|
| - // Report lower 640KB of RAM. Attribute EFI_RESOURCE_ATTRIBUTE_TESTED
|
| - // is intentionally omitted to prevent erasing of the coreboot header
|
| - // record before it is processed by CbParseMemoryInfo.
|
| - //
|
| BuildResourceDescriptorHob (
|
| EFI_RESOURCE_SYSTEM_MEMORY,
|
| (
|
| EFI_RESOURCE_ATTRIBUTE_PRESENT |
|
| EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
|
| + EFI_RESOURCE_ATTRIBUTE_TESTED |
|
| EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
|
| EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
|
| EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
|
| EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE
|
| ),
|
| - (EFI_PHYSICAL_ADDRESS)(0),
|
| - (UINT64)(0xA0000)
|
| + // Lower 640KB, except for first 4KB where the lower coreboot pointer ("LBIO") resides
|
| + (EFI_PHYSICAL_ADDRESS)(0 + 0x1000),
|
| + (UINT64)(0xA0000 - 0x1000)
|
| );
|
|
|
|
|
| @@ -309,7 +306,7 @@ CbPeiEntryPoint ( |
| // Set cache on the physical memory
|
| //
|
| MtrrSetMemoryAttribute (BASE_1MB, LowMemorySize - BASE_1MB, CacheWriteBack);
|
| - MtrrSetMemoryAttribute (0, 0xA0000, CacheWriteBack);
|
| + MtrrSetMemoryAttribute ((0 + 0x1000), (0xA0000 - 0x1000), CacheWriteBack);
|
|
|
| //
|
| // Create Memory Type Information HOB
|
| -- |
| 2.14.0 |
| |
