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* Create a branch for USB experiments.
svn path=/branches/usb-experiments/; revision=72629
This commit is contained in:
Amine Khaldi
parent
28d8ba0d3e
commit
0ee830d7a4
23049 changed files with 0 additions and 1313991 deletions
268
boot/environ/lib/arch/i386/arch.c
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268
boot/environ/lib/arch/i386/arch.c
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/*
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* COPYRIGHT: See COPYING.ARM in the top level directory
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* PROJECT: ReactOS UEFI Boot Library
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* FILE: boot/environ/lib/arch/i386/arch.c
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* PURPOSE: Boot Library Architectural Initialization for i386
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* PROGRAMMER: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include "bl.h"
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/* DATA VARIABLES ************************************************************/
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BL_ARCH_CONTEXT FirmwareExecutionContext;
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BL_ARCH_CONTEXT ApplicationExecutionContext;
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PBL_ARCH_CONTEXT CurrentExecutionContext;
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/* FUNCTIONS *****************************************************************/
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VOID
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DECLSPEC_NORETURN
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ArchTrapNoProcess (
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VOID
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)
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{
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/* Do nothing, this is an unsupported debugging interrupt */
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#if defined(__GNUC__)
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__asm__ __volatile__ ("iret");
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#elif defined (_MSC_VER)
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_asm { iret };
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#else
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#error wtf are you using
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#endif
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__assume(0);
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}
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VOID
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ArchSwitchContext (
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_In_ PBL_ARCH_CONTEXT NewContext,
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_In_ PBL_ARCH_CONTEXT OldContext
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)
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{
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/* Are we switching to real mode? */
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if (NewContext->Mode == BlRealMode)
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{
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/* Disable paging */
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__writecr0(__readcr0() & ~CR0_PG);
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/* Are we coming from PAE mode? */
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if ((OldContext != NULL) && (OldContext->TranslationType == BlPae))
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{
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/* Turn off PAE */
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__writecr4(__readcr4() & ~CR4_PAE);
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}
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/* Enable interrupts */
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_enable();
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}
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else
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{
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/* Switching to protected mode -- disable interrupts if needed */
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if (!(NewContext->ContextFlags & BL_CONTEXT_INTERRUPTS_ON))
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{
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_disable();
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}
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/* Are we enabling paging for the first time? */
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if (NewContext->ContextFlags & BL_CONTEXT_PAGING_ON)
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{
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/* In PAE mode? */
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if (NewContext->TranslationType == BlPae)
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{
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/* Turn on PAE */
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__writecr4(__readcr4() | CR4_PAE);
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}
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/* Turn on paging */
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__writecr0(__readcr0() | CR0_PG);
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}
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}
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}
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NTSTATUS
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ArchInitializeContext (
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_In_ PBL_ARCH_CONTEXT Context
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)
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{
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NTSTATUS Status = STATUS_SUCCESS;
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/* Are we initializing real mode? */
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if (Context->Mode == BlRealMode)
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{
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/* Disable paging, enable interrupts */
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Context->ContextFlags &= ~BL_CONTEXT_PAGING_ON;
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Context->ContextFlags |= BL_CONTEXT_INTERRUPTS_ON;
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}
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else if (!(BlpApplicationFlags & BL_APPLICATION_FLAG_CONVERTED_FROM_EFI) ||
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(BlpLibraryParameters.TranslationType != BlNone))
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{
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/* Read the current translation type */
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Context->TranslationType = BlpLibraryParameters.TranslationType;
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/* Disable paging (it's already on), enable interrupts */
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Context->ContextFlags &= ~BL_CONTEXT_PAGING_ON;
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Context->ContextFlags |= BL_CONTEXT_INTERRUPTS_ON;
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/* Enable FXSR support in the FPU */
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__writecr4(__readcr4() | CR4_FXSR);
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}
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else
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{
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/* Invalid context */
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Status = STATUS_NOT_SUPPORTED;
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}
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/* Return context status */
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return Status;
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}
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NTSTATUS
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ArchInitializeContexts (
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VOID
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)
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{
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PBL_ARCH_CONTEXT Context = NULL;
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NTSTATUS EfiStatus, AppStatus;
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/* No current context */
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CurrentExecutionContext = NULL;
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/* Setup the EFI and Application modes respectively */
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FirmwareExecutionContext.Mode = BlRealMode;
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ApplicationExecutionContext.Mode = BlProtectedMode;
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/* Initialize application mode */
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AppStatus = ArchInitializeContext(&ApplicationExecutionContext);
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if (NT_SUCCESS(AppStatus))
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{
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/* Set it as current if it worked */
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Context = &ApplicationExecutionContext;
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CurrentExecutionContext = &ApplicationExecutionContext;
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}
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/* Initialize EFI mode */
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EfiStatus = ArchInitializeContext(&FirmwareExecutionContext);
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if (NT_SUCCESS(EfiStatus))
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{
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/* Set it as current if application context failed */
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if (!NT_SUCCESS(AppStatus))
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{
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Context = &FirmwareExecutionContext;
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CurrentExecutionContext = &FirmwareExecutionContext;
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}
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/* Switch to application mode, or EFI if that one failed */
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ArchSwitchContext(Context, NULL);
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EfiStatus = STATUS_SUCCESS;
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}
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/* Return initialization state */
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return EfiStatus;
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}
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VOID
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BlpArchSwitchContext (
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_In_ BL_ARCH_MODE NewMode
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)
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{
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PBL_ARCH_CONTEXT Context;
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/* In real mode, use EFI, otherwise, use the application mode */
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Context = &FirmwareExecutionContext;
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if (NewMode != BlProtectedMode) Context = &ApplicationExecutionContext;
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/* Are we in a different mode? */
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if (CurrentExecutionContext->Mode != NewMode)
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{
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/* Switch to the new one */
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ArchSwitchContext(Context, CurrentExecutionContext);
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CurrentExecutionContext = Context;
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}
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}
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/*++
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* @name BlpArchInitialize
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*
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* The BlpArchInitialize function initializes the Boot Library.
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*
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* @param Phase
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* Pointer to the Boot Application Parameter Block.
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*
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* @return NT_SUCCESS if the boot library was loaded correctly, relevant error
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* otherwise.
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*
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*--*/
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NTSTATUS
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BlpArchInitialize (
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_In_ ULONG Phase
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)
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{
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KDESCRIPTOR Idtr;
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USHORT CodeSegment;
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NTSTATUS Status;
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PKIDTENTRY IdtBase;
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/* Assume success */
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Status = STATUS_SUCCESS;
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/* Is this phase 1? */
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if (Phase != 0)
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{
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/* Get the IDT */
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__sidt(&Idtr);
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IdtBase = (PKIDTENTRY)Idtr.Base;
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/* Get the Code Segment */
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#if defined(__GNUC__)
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__asm__ __volatile__ ("mov %%cs,%0\n\t" :"=r" (CodeSegment));
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#elif defined (_MSC_VER)
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_asm { mov CodeSegment, cs };
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#else
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#error wtf are you using
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#endif
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/* Set up INT 3, ASSERT, and SECURITY_ASSERT to be no-op (for Rtl) */
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IdtBase[3].Offset = (USHORT)(ULONG_PTR)ArchTrapNoProcess;
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IdtBase[3].Selector = CodeSegment;
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IdtBase[3].Access = 0x8E00u;
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IdtBase[3].ExtendedOffset = (ULONG_PTR)ArchTrapNoProcess >> 16;
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IdtBase[0x2C].Offset = (USHORT)(ULONG_PTR)ArchTrapNoProcess;
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IdtBase[0x2C].Selector = CodeSegment;
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IdtBase[0x2C].Access = 0x8E00u;
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IdtBase[0x2C].ExtendedOffset = (ULONG_PTR)ArchTrapNoProcess >> 16;
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IdtBase[0x2D].Offset = (USHORT)(ULONG_PTR)ArchTrapNoProcess;
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IdtBase[0x2D].Selector = CodeSegment;
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IdtBase[0x2D].Access = 0x8E00u;
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IdtBase[0x2D].ExtendedOffset = (ULONG_PTR)ArchTrapNoProcess >> 16;
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/* Write the IDT back */
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Idtr.Base = (ULONG)IdtBase;
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__lidt(&Idtr);
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/* Reset FPU state */
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#if defined(__GNUC__)
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__asm__ __volatile__ ("fninit");
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#elif defined (_MSC_VER)
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_asm { fninit };
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#else
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#error wtf are you using
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#endif
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}
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else
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{
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/* Reset TSC if needed */
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if ((__readmsr(0x10) >> 32) & 0xFFC00000)
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{
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__writemsr(0x10, 0);
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}
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/* Initialize all the contexts */
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Status = ArchInitializeContexts();
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}
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/* Return initialization state */
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return Status;
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}
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