1 /** @file 2 SAL Library implementation retrieving the SAL Entry Point from the SAL System Table 3 register in the EFI System Configuration Table. 4 5 Copyright (c) 2007 - 2010, Intel Corporation. All rights reserved.<BR> 6 This program and the accompanying materials are 7 licensed and made available under the terms and conditions of 8 the BSD License which accompanies this distribution. The full 9 text of the license may be found at 10 http://opensource.org/licenses/bsd-license.php. 11 12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 14 15 **/ 16 17 #include <PiDxe.h> 18 #include <IndustryStandard/Sal.h> 19 20 #include <Library/SalLib.h> 21 #include <Library/UefiLib.h> 22 #include <Library/DebugLib.h> 23 24 #include <Guid/SalSystemTable.h> 25 26 EFI_PLABEL mPlabel; 27 SAL_PROC mSalProcEntry; 28 29 /** 30 Makes a SAL procedure call. 31 32 This is a wrapper function to make a SAL procedure call. 33 No parameter checking is performed on the 8 input parameters, 34 but there are some common rules that the caller should follow 35 when making a SAL call. Any address passed to SAL as buffers 36 for return parameters must be 8-byte aligned. Unaligned 37 addresses may cause undefined results. For those parameters 38 defined as reserved or some fields defined as reserved must be 39 zero filled or the invalid argument return value may be returned 40 or undefined result may occur during the execution of the procedure. 41 This function is only available on IPF. 42 43 @param Index The SAL procedure Index number. 44 @param Arg2 The 2nd parameter for SAL procedure calls. 45 @param Arg3 The 3rd parameter for SAL procedure calls. 46 @param Arg4 The 4th parameter for SAL procedure calls. 47 @param Arg5 The 5th parameter for SAL procedure calls. 48 @param Arg6 The 6th parameter for SAL procedure calls. 49 @param Arg7 The 7th parameter for SAL procedure calls. 50 @param Arg8 The 8th parameter for SAL procedure calls. 51 52 @return SAL returned registers. 53 54 **/ 55 SAL_RETURN_REGS 56 EFIAPI 57 SalCall ( 58 IN UINT64 Index, 59 IN UINT64 Arg2, 60 IN UINT64 Arg3, 61 IN UINT64 Arg4, 62 IN UINT64 Arg5, 63 IN UINT64 Arg6, 64 IN UINT64 Arg7, 65 IN UINT64 Arg8 66 ) 67 { 68 // 69 // mSalProcEntry is initialized in library constructor as SAL entry. 70 // 71 return mSalProcEntry( 72 Index, 73 Arg2, 74 Arg3, 75 Arg4, 76 Arg5, 77 Arg6, 78 Arg7, 79 Arg8 80 ); 81 82 } 83 84 /** 85 The constructor function of UEFI SAL Lib. 86 87 The constructor function looks up the SAL System Table in the EFI System Configuration 88 Table. Once the SAL System Table is found, the SAL Entry Point in the SAL System Table 89 will be derived and stored into a global variable for library usage. 90 It will ASSERT() if the SAL System Table cannot be found or the data in the SAL System 91 Table is not the valid data. 92 93 @param ImageHandle The firmware allocated handle for the EFI image. 94 @param SystemTable A pointer to the EFI System Table. 95 96 @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS. 97 98 **/ 99 EFI_STATUS 100 EFIAPI 101 UefiSalLibConstructor ( 102 IN EFI_HANDLE ImageHandle, 103 IN EFI_SYSTEM_TABLE *SystemTable 104 ) 105 { 106 EFI_STATUS Status; 107 SAL_ST_ENTRY_POINT_DESCRIPTOR *SalStEntryDes; 108 SAL_SYSTEM_TABLE_HEADER *SalSystemTable; 109 110 Status = EfiGetSystemConfigurationTable ( 111 &gEfiSalSystemTableGuid, 112 (VOID **) &SalSystemTable 113 ); 114 ASSERT_EFI_ERROR (Status); 115 ASSERT (SalSystemTable != NULL); 116 117 // 118 // Check the first entry of SAL System Table, 119 // because the SAL entry is in ascending order with the entry type, 120 // the type 0 entry should be the first if exist. 121 // 122 SalStEntryDes = (SAL_ST_ENTRY_POINT_DESCRIPTOR *)(SalSystemTable + 1); 123 124 // 125 // Assure the SAL ENTRY Type is 0 126 // 127 ASSERT (SalStEntryDes->Type == EFI_SAL_ST_ENTRY_POINT); 128 129 mPlabel.EntryPoint = SalStEntryDes->SalProcEntry; 130 mPlabel.GP = SalStEntryDes->SalGlobalDataPointer; 131 // 132 // Make sure the EntryPoint has the valid value 133 // 134 ASSERT ((mPlabel.EntryPoint != 0) && (mPlabel.GP != 0)); 135 136 mSalProcEntry = (SAL_PROC)((UINT64)&(mPlabel.EntryPoint)); 137 138 return EFI_SUCCESS; 139 } 140
