1 /** @file 2 Non-existing BaseLib functions on x64 3 4 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php. 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include <Library/BaseLib.h> 16 #include <Library/DebugLib.h> 17 18 /** 19 Enables the 32-bit paging mode on the CPU. 20 21 Enables the 32-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables 22 must be properly initialized prior to calling this service. This function 23 assumes the current execution mode is 32-bit protected mode. This function is 24 only available on IA-32. After the 32-bit paging mode is enabled, control is 25 transferred to the function specified by EntryPoint using the new stack 26 specified by NewStack and passing in the parameters specified by Context1 and 27 Context2. Context1 and Context2 are optional and may be NULL. The function 28 EntryPoint must never return. 29 30 There are a number of constraints that must be followed before calling this 31 function: 32 1) Interrupts must be disabled. 33 2) The caller must be in 32-bit protected mode with flat descriptors. This 34 means all descriptors must have a base of 0 and a limit of 4GB. 35 3) CR0 and CR4 must be compatible with 32-bit protected mode with flat 36 descriptors. 37 4) CR3 must point to valid page tables that will be used once the transition 38 is complete, and those page tables must guarantee that the pages for this 39 function and the stack are identity mapped. 40 41 @param EntryPoint A pointer to function to call with the new stack after 42 paging is enabled. 43 @param Context1 A pointer to the context to pass into the EntryPoint 44 function as the first parameter after paging is enabled. 45 @param Context2 A pointer to the context to pass into the EntryPoint 46 function as the second parameter after paging is enabled. 47 @param NewStack A pointer to the new stack to use for the EntryPoint 48 function after paging is enabled. 49 50 **/ 51 VOID 52 EFIAPI 53 InternalX86EnablePaging32 ( 54 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 55 IN VOID *Context1, OPTIONAL 56 IN VOID *Context2, OPTIONAL 57 IN VOID *NewStack 58 ) 59 { 60 // 61 // This function cannot work on x64 platform 62 // 63 ASSERT (FALSE); 64 } 65 66 /** 67 Disables the 32-bit paging mode on the CPU. 68 69 Disables the 32-bit paging mode on the CPU and returns to 32-bit protected 70 mode. This function assumes the current execution mode is 32-paged protected 71 mode. This function is only available on IA-32. After the 32-bit paging mode 72 is disabled, control is transferred to the function specified by EntryPoint 73 using the new stack specified by NewStack and passing in the parameters 74 specified by Context1 and Context2. Context1 and Context2 are optional and 75 may be NULL. The function EntryPoint must never return. 76 77 There are a number of constraints that must be followed before calling this 78 function: 79 1) Interrupts must be disabled. 80 2) The caller must be in 32-bit paged mode. 81 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode. 82 4) CR3 must point to valid page tables that guarantee that the pages for 83 this function and the stack are identity mapped. 84 85 @param EntryPoint A pointer to function to call with the new stack after 86 paging is disabled. 87 @param Context1 A pointer to the context to pass into the EntryPoint 88 function as the first parameter after paging is disabled. 89 @param Context2 A pointer to the context to pass into the EntryPoint 90 function as the second parameter after paging is 91 disabled. 92 @param NewStack A pointer to the new stack to use for the EntryPoint 93 function after paging is disabled. 94 95 **/ 96 VOID 97 EFIAPI 98 InternalX86DisablePaging32 ( 99 IN SWITCH_STACK_ENTRY_POINT EntryPoint, 100 IN VOID *Context1, OPTIONAL 101 IN VOID *Context2, OPTIONAL 102 IN VOID *NewStack 103 ) 104 { 105 // 106 // This function cannot work on x64 platform 107 // 108 ASSERT (FALSE); 109 } 110 111 112 /** 113 Enables the 64-bit paging mode on the CPU. 114 115 Enables the 64-bit paging mode on the CPU. CR0, CR3, CR4, and the page tables 116 must be properly initialized prior to calling this service. This function 117 assumes the current execution mode is 32-bit protected mode with flat 118 descriptors. This function is only available on IA-32. After the 64-bit 119 paging mode is enabled, control is transferred to the function specified by 120 EntryPoint using the new stack specified by NewStack and passing in the 121 parameters specified by Context1 and Context2. Context1 and Context2 are 122 optional and may be 0. The function EntryPoint must never return. 123 124 @param Cs The 16-bit selector to load in the CS before EntryPoint 125 is called. The descriptor in the GDT that this selector 126 references must be setup for long mode. 127 @param EntryPoint The 64-bit virtual address of the function to call with 128 the new stack after paging is enabled. 129 @param Context1 The 64-bit virtual address of the context to pass into 130 the EntryPoint function as the first parameter after 131 paging is enabled. 132 @param Context2 The 64-bit virtual address of the context to pass into 133 the EntryPoint function as the second parameter after 134 paging is enabled. 135 @param NewStack The 64-bit virtual address of the new stack to use for 136 the EntryPoint function after paging is enabled. 137 138 **/ 139 VOID 140 EFIAPI 141 InternalX86EnablePaging64 ( 142 IN UINT16 Cs, 143 IN UINT64 EntryPoint, 144 IN UINT64 Context1, OPTIONAL 145 IN UINT64 Context2, OPTIONAL 146 IN UINT64 NewStack 147 ) 148 { 149 // 150 // This function cannot work on x64 platform. 151 // 152 ASSERT (FALSE); 153 } 154
