657d3918fe
• Make access to PcdDxeIplSwitchToLongMode to Ia32 specific code. • Introduce another feature flag named PcdDxeIplBuildShareCodeHobs to define whether to build hobs to DXE core to share code. • Remove the #progma bug git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2026 6f19259b-4bc3-4df7-8a09-765794883524
90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/*++
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Copyright (c) 2006, Intel Corporation
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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Module Name:
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DxeLoadFunc.c
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Abstract:
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Ia32-specifc functionality for DxeLoad.
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--*/
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#include "DxeIpl.h"
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VOID
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HandOffToDxeCore (
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IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,
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IN EFI_PEI_HOB_POINTERS HobList
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)
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{
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EFI_STATUS Status;
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EFI_PHYSICAL_ADDRESS BaseOfStack;
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EFI_PHYSICAL_ADDRESS TopOfStack;
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EFI_PHYSICAL_ADDRESS PageTables;
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Status = PeiServicesAllocatePages (EfiBootServicesData, EFI_SIZE_TO_PAGES (STACK_SIZE), &BaseOfStack);
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ASSERT_EFI_ERROR (Status);
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if (FeaturePcdGet(PcdDxeIplSwitchToLongMode)) {
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//
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// Compute the top of the stack we were allocated, which is used to load X64 dxe core.
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// Pre-allocate a 32 bytes which confroms to x64 calling convention.
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//
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// The first four parameters to a function are passed in rcx, rdx, r8 and r9.
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// Any further parameters are pushed on the stack. Furthermore, space (4 * 8bytes) for the
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// register parameters is reserved on the stack, in case the called function
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// wants to spill them; this is important if the function is variadic.
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//
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TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - 32;
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//
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// X64 Calling Conventions requires that the stack must be aligned to 16 bytes
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//
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TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, 16);
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//
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// Load the GDT of Go64. Since the GDT of 32-bit Tiano locates in the BS_DATA
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// memory, it may be corrupted when copying FV to high-end memory
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//
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LoadGo64Gdt();
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//
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// Limit to 36 bits of addressing for debug. Should get it from CPU
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//
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PageTables = CreateIdentityMappingPageTables (36);
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//
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// Go to Long Mode. Interrupts will not get turned on until the CPU AP is loaded.
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// Call x64 drivers passing in single argument, a pointer to the HOBs.
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//
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ActivateLongMode (
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PageTables,
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(EFI_PHYSICAL_ADDRESS)(UINTN)(HobList.Raw),
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TopOfStack,
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0x00000000,
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DxeCoreEntryPoint
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);
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} else {
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//
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// Compute the top of the stack we were allocated. Pre-allocate a UINTN
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// for safety.
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//
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TopOfStack = BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT;
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TopOfStack = (EFI_PHYSICAL_ADDRESS) (UINTN) ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
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SwitchStack (
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(SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
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HobList.Raw,
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NULL,
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(VOID *) (UINTN) TopOfStack
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);
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}
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}
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