1 /*++ 2 3 Copyright (c) 1998 Intel Corporation 4 5 Module Name: 6 7 vm.c 8 9 Abstract: 10 11 EFI Hell to remap runtime address into the new virual address space 12 that was registered by the OS for RT calls. 13 14 So the code image needs to be relocated. All pointers need to be 15 manually fixed up since the address map changes. 16 17 GOOD LUCK NOT HAVING BUGS IN YOUR CODE! PLEASE TEST A LOT. MAKE SURE 18 EXIT BOOTSERVICES OVER WRITES ALL BOOTSERVICE MEMORY & DATA SPACES WHEN 19 YOU TEST. 20 21 Revision History 22 23 --*/ 24 25 #include "lib.h" 26 27 #ifndef __GNUC__ 28 #pragma RUNTIME_CODE(RtLibEnableVirtualMappings) 29 #endif 30 VOID 31 RUNTIMEFUNCTION 32 RtLibEnableVirtualMappings ( 33 VOID 34 ) 35 { 36 EFI_CONVERT_POINTER ConvertPointer; 37 38 // 39 // If this copy of the lib is linked into the firmware, then 40 // do not update the pointers yet. 41 // 42 43 if (!LibFwInstance) { 44 45 // 46 // Different components are updating to the new virtual 47 // mappings at differnt times. The only function that 48 // is safe to call at this notification is ConvertAddress 49 // 50 51 ConvertPointer = RT->ConvertPointer; 52 53 // 54 // Fix any pointers that the lib created, that may be needed 55 // during runtime. 56 // 57 58 ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&RT); 59 ConvertPointer (EFI_OPTIONAL_PTR, (VOID **)&LibRuntimeDebugOut); 60 61 ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&LibRuntimeRaiseTPL); 62 ConvertPointer (EFI_INTERNAL_PTR, (VOID **)&LibRuntimeRestoreTPL); 63 64 // that was it :^) 65 } 66 } 67 68 69 #ifndef __GNUC__ 70 #pragma RUNTIME_CODE(RtConvertList) 71 #endif 72 VOID 73 RUNTIMEFUNCTION 74 RtConvertList ( 75 IN UINTN DebugDisposition, 76 IN OUT LIST_ENTRY *ListHead 77 ) 78 { 79 LIST_ENTRY *Link; 80 LIST_ENTRY *NextLink; 81 EFI_CONVERT_POINTER ConvertPointer; 82 83 ConvertPointer = RT->ConvertPointer; 84 85 // 86 // Convert all the Flink & Blink pointers in the list 87 // 88 89 Link = ListHead; 90 do { 91 NextLink = Link->Flink; 92 93 ConvertPointer ( 94 Link->Flink == ListHead ? DebugDisposition : 0, 95 (VOID **)&Link->Flink 96 ); 97 98 ConvertPointer ( 99 Link->Blink == ListHead ? DebugDisposition : 0, 100 (VOID **)&Link->Blink 101 ); 102 103 Link = NextLink; 104 } while (Link != ListHead); 105 } 106
