Remove hard code value and create new PCDs for OpROM reserved range in CSM module.

[mirror_edk2.git] / IntelFrameworkModulePkg / Csm / LegacyBiosDxe / LegacyBios.c

diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
index 0381098c8a8f64b8679c1f4aed8b68ebacdfe462..99a76c9f21acdd7b12f340621615c91122af8104 100644 (file)
--- a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBios.c
@@ -682,6 +682,7 @@ LegacyBiosInstall (
   LEGACY_BIOS_INSTANCE               *Private;\r
   EFI_TO_COMPATIBILITY16_INIT_TABLE  *EfiToLegacy16InitTable;\r
   EFI_PHYSICAL_ADDRESS               MemoryAddress;\r
+  EFI_PHYSICAL_ADDRESS               EbdaReservedBaseAddress;\r
   VOID                               *MemoryPtr;\r
   EFI_PHYSICAL_ADDRESS               MemoryAddressUnder1MB;\r
   UINTN                              Index;\r
@@ -880,9 +881,21 @@ LegacyBiosInstall (
   //\r
   // Allocate all 32k chunks from 0x60000 ~ 0x88000 for Legacy OPROMs that\r
   // don't use PMM but look for zeroed memory. Note that various non-BBS\r
-  // SCSIs expect different areas to be free\r
+  // OpROMs expect different areas to be free\r
   //\r
-  for (MemStart = 0x60000; MemStart < 0x88000; MemStart += 0x1000) {\r
+  EbdaReservedBaseAddress = MemoryAddress;\r
+  MemoryAddress = PcdGet32 (PcdOpromReservedMemoryBase);\r
+  MemorySize    = PcdGet32 (PcdOpromReservedMemorySize);\r
+  //\r
+  // Check if base address and size for reserved memory are 4KB aligned.\r
+  //\r
+  ASSERT ((MemoryAddress & 0xFFF) == 0);\r
+  ASSERT ((MemorySize & 0xFFF) == 0);\r
+  //\r
+  // Check if the reserved memory is below EBDA reserved range.\r
+  //\r
+  ASSERT ((MemoryAddress < EbdaReservedBaseAddress) && ((MemoryAddress + MemorySize - 1) < EbdaReservedBaseAddress));\r
+  for (MemStart = MemoryAddress; MemStart < MemoryAddress + MemorySize; MemStart += 0x1000) {\r
     Status = AllocateLegacyMemory (\r
                AllocateAddress,\r
                MemStart,\r