MdeModulePkg/Core/DxeIplPeim/Ia32/DxeLoadFunc.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   DxeLoadFunc.c
  15
  16 Abstract:
  17
  18   Ia32-specifc functionality for DxeLoad.
  19
  20 --*/
  21
  22 //
  23 // Include common header file for this module.
  24 //
  25 #include "CommonHeader.h"
  26
  27 #include "DxeIpl.h"
  28 #include "VirtualMemory.h"
  29
  30 //
  31 // Global Descriptor Table (GDT)
  32 //
  33 GLOBAL_REMOVE_IF_UNREFERENCED IA32_GDT gGdtEntries [] = {
  34 /* selector { Global Segment Descriptor                              } */
  35 /* 0x00 */  {{0,      0,  0,  0,    0,  0,  0,  0,    0,  0, 0,  0,  0}}, //null descriptor
  36 /* 0x08 */  {{0xffff, 0,  0,  0x2,  1,  0,  1,  0xf,  0,  0, 1,  1,  0}}, //linear data segment descriptor
  37 /* 0x10 */  {{0xffff, 0,  0,  0xf,  1,  0,  1,  0xf,  0,  0, 1,  1,  0}}, //linear code segment descriptor
  38 /* 0x18 */  {{0xffff, 0,  0,  0x3,  1,  0,  1,  0xf,  0,  0, 1,  1,  0}}, //system data segment descriptor
  39 /* 0x20 */  {{0xffff, 0,  0,  0xa,  1,  0,  1,  0xf,  0,  0, 1,  1,  0}}, //system code segment descriptor
  40 /* 0x28 */  {{0,      0,  0,  0,    0,  0,  0,  0,    0,  0, 0,  0,  0}}, //spare segment descriptor
  41 /* 0x30 */  {{0xffff, 0,  0,  0x2,  1,  0,  1,  0xf,  0,  0, 1,  1,  0}}, //system data segment descriptor
  42 /* 0x38 */  {{0xffff, 0,  0,  0xa,  1,  0,  1,  0xf,  0,  1, 0,  1,  0}}, //system code segment descriptor
  43 /* 0x40 */  {{0,      0,  0,  0,    0,  0,  0,  0,    0,  0, 0,  0,  0}}, //spare segment descriptor
  44 };
  45
  46 //
  47 // IA32 Gdt register
  48 //
  49 GLOBAL_REMOVE_IF_UNREFERENCED CONST IA32_DESCRIPTOR gGdt = {
  50   sizeof (gGdtEntries) - 1,
  51   (UINTN) gGdtEntries
  52   };
  53
  54 VOID
  55 HandOffToDxeCore (
  56   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  57   IN EFI_PEI_HOB_POINTERS   HobList,
  58   IN EFI_PEI_PPI_DESCRIPTOR *EndOfPeiSignal
  59   )
  60 {
  61   EFI_STATUS                Status;
  62   EFI_PHYSICAL_ADDRESS      BaseOfStack;
  63   EFI_PHYSICAL_ADDRESS      TopOfStack;
  64   UINTN                     PageTables;
  65
  66   Status = PeiServicesAllocatePages (EfiBootServicesData, EFI_SIZE_TO_PAGES (STACK_SIZE), &BaseOfStack);
  67   ASSERT_EFI_ERROR (Status);
  68
  69   if (FeaturePcdGet(PcdDxeIplSwitchToLongMode)) {
  70     //
  71     // Compute the top of the stack we were allocated, which is used to load X64 dxe core.
  72     // Pre-allocate a 32 bytes which confroms to x64 calling convention.
  73     //
  74     // The first four parameters to a function are passed in rcx, rdx, r8 and r9.
  75     // Any further parameters are pushed on the stack. Furthermore, space (4 * 8bytes) for the
  76     // register parameters is reserved on the stack, in case the called function
  77     // wants to spill them; this is important if the function is variadic.
  78     //
  79     TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - 32;
  80
  81     //
  82     //  X64 Calling Conventions requires that the stack must be aligned to 16 bytes
  83     //
  84     TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, 16);
  85
  86     //
  87     // Load the GDT of Go64. Since the GDT of 32-bit Tiano locates in the BS_DATA
  88     // memory, it may be corrupted when copying FV to high-end memory
  89     //
  90     AsmWriteGdtr (&gGdt);
  91     //
  92     // Create page table and save PageMapLevel4 to CR3
  93     //
  94     PageTables = CreateIdentityMappingPageTables ();
  95
  96     //
  97     // End of PEI phase singal
  98     //
  99     Status = PeiServicesInstallPpi (EndOfPeiSignal);
 100     ASSERT_EFI_ERROR (Status);
 101
 102     AsmWriteCr3 (PageTables);
 103      //
 104     // Go to Long Mode. Interrupts will not get turned on until the CPU AP is loaded.
 105     // Call x64 drivers passing in single argument, a pointer to the HOBs.
 106     //
 107     AsmEnablePaging64 (
 108       SYS_CODE64_SEL,
 109       DxeCoreEntryPoint,
 110       (EFI_PHYSICAL_ADDRESS)(UINTN)(HobList.Raw),
 111       0,
 112       TopOfStack
 113       );
 114   } else {
 115     //
 116     // Compute the top of the stack we were allocated. Pre-allocate a UINTN
 117     // for safety.
 118     //
 119     TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT;
 120     TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
 121
 122     //
 123     // End of PEI phase singal
 124     //
 125     Status = PeiServicesInstallPpi (EndOfPeiSignal);
 126     ASSERT_EFI_ERROR (Status);
 127
 128     SwitchStack (
 129       (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
 130       HobList.Raw,
 131       NULL,
 132       (VOID *) (UINTN) TopOfStack
 133       );
 134   }
 135 }
 136