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[mirror_edk2.git] / DuetPkg / BiosVideoThunkDxe / LegacyBiosThunk.c

/** @file\r
  Provide legacy thunk interface for accessing Bios Video Rom.\r
  \r
Copyright (c) 2006 - 2007, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials                          \r
are licensed and made available under the terms and conditions of the BSD License         \r
which accompanies this distribution.  The full text of the license may be found at        \r
http://opensource.org/licenses/bsd-license.php                                            \r
                                                                                          \r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
\r
**/\r
\r
#include "BiosVideo.h"\r
\r
#define EFI_CPU_EFLAGS_IF 0x200\r
\r
/**\r
  Initialize legacy environment for BIOS INI caller.\r
  \r
  @param ThunkContext   the instance pointer of THUNK_CONTEXT\r
**/\r
VOID\r
InitializeBiosIntCaller (\r
  THUNK_CONTEXT     *ThunkContext\r
  )\r
{\r
  EFI_STATUS            Status;\r
  UINT32                RealModeBufferSize;\r
  UINT32                ExtraStackSize;\r
  EFI_PHYSICAL_ADDRESS  LegacyRegionBase;\r
  UINT32                LegacyRegionSize;\r
  //\r
  // Get LegacyRegion\r
  //\r
  AsmGetThunk16Properties (&RealModeBufferSize, &ExtraStackSize);\r
  LegacyRegionSize = (((RealModeBufferSize + ExtraStackSize) / EFI_PAGE_SIZE) + 1) * EFI_PAGE_SIZE;\r
  LegacyRegionBase = 0x100000;\r
  Status = gBS->AllocatePages (\r
                  AllocateMaxAddress,\r
                  EfiACPIMemoryNVS,\r
                  EFI_SIZE_TO_PAGES(LegacyRegionSize),\r
                  &LegacyRegionBase\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
  \r
  ThunkContext->RealModeBuffer     = (VOID*)(UINTN)LegacyRegionBase;\r
  ThunkContext->RealModeBufferSize = LegacyRegionSize;\r
  ThunkContext->ThunkAttributes    = THUNK_ATTRIBUTE_BIG_REAL_MODE|THUNK_ATTRIBUTE_DISABLE_A20_MASK_INT_15;\r
  AsmPrepareThunk16(ThunkContext);\r
}\r
\r
/**\r
   Initialize interrupt redirection code and entries, because\r
   IDT Vectors 0x68-0x6f must be redirected to IDT Vectors 0x08-0x0f.\r
   Or the interrupt will lost when we do thunk.\r
   NOTE: We do not reset 8259 vector base, because it will cause pending\r
   interrupt lost.\r
   \r
   @param Legacy8259  Instance pointer for EFI_LEGACY_8259_PROTOCOL.\r
   \r
**/\r
VOID\r
InitializeInterruptRedirection (\r
  IN  EFI_LEGACY_8259_PROTOCOL  *Legacy8259\r
  )\r
{\r
  EFI_STATUS            Status;\r
  EFI_PHYSICAL_ADDRESS  LegacyRegionBase;\r
  UINTN                 LegacyRegionLength;\r
  UINT32                *IdtArray;\r
  UINTN                 Index;\r
  UINT8                 ProtectedModeBaseVector;\r
  UINT32                InterruptRedirectionCode[] = {\r
    0x90CF08CD, // INT8; IRET; NOP\r
    0x90CF09CD, // INT9; IRET; NOP\r
    0x90CF0ACD, // INTA; IRET; NOP\r
    0x90CF0BCD, // INTB; IRET; NOP\r
    0x90CF0CCD, // INTC; IRET; NOP\r
    0x90CF0DCD, // INTD; IRET; NOP\r
    0x90CF0ECD, // INTE; IRET; NOP\r
    0x90CF0FCD  // INTF; IRET; NOP\r
  };\r
\r
  //\r
  // Get LegacyRegion\r
  //\r
  LegacyRegionLength = sizeof(InterruptRedirectionCode);\r
  LegacyRegionBase = 0x100000;\r
  Status = gBS->AllocatePages (\r
                  AllocateMaxAddress,\r
                  EfiACPIMemoryNVS,\r
                  EFI_SIZE_TO_PAGES(LegacyRegionLength),\r
                  &LegacyRegionBase\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Copy code to legacy region\r
  //\r
  CopyMem ((VOID *)(UINTN)LegacyRegionBase, InterruptRedirectionCode, sizeof (InterruptRedirectionCode));\r
\r
  //\r
  // Get VectorBase, it should be 0x68\r
  //\r
  Status = Legacy8259->GetVector (Legacy8259, Efi8259Irq0, &ProtectedModeBaseVector);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Patch IVT 0x68 ~ 0x6f\r
  //\r
  IdtArray = (UINT32 *) 0;\r
  for (Index = 0; Index < 8; Index++) {\r
    IdtArray[ProtectedModeBaseVector + Index] = ((EFI_SEGMENT (LegacyRegionBase + Index * 4)) << 16) | (EFI_OFFSET (LegacyRegionBase + Index * 4));\r
  }\r
\r
  return ;\r
}\r
\r
/**\r
  Thunk to 16-bit real mode and execute a software interrupt with a vector \r
  of BiosInt. Regs will contain the 16-bit register context on entry and \r
  exit.\r
  \r
  @param  This    Protocol instance pointer.\r
  @param  BiosInt Processor interrupt vector to invoke\r
  @param  Reg     Register contexted passed into (and returned) from thunk to 16-bit mode\r
  \r
  @retval TRUE   Thunk completed, and there were no BIOS errors in the target code.\r
                 See Regs for status.\r
  @retval FALSE  There was a BIOS erro in the target code.  \r
**/\r
BOOLEAN\r
EFIAPI\r
LegacyBiosInt86 (\r
  IN  BIOS_VIDEO_DEV                 *BiosDev,\r
  IN  UINT8                           BiosInt,\r
  IN  IA32_REGISTER_SET              *Regs\r
  )\r
{\r
  UINTN                 Status;\r
  UINTN                 Eflags;\r
  IA32_REGISTER_SET     ThunkRegSet;\r
  BOOLEAN               Ret;\r
  UINT16                *Stack16;\r
  \r
  ZeroMem (&ThunkRegSet, sizeof (ThunkRegSet));\r
  ThunkRegSet.E.EFLAGS.Bits.Reserved_0 = 1;\r
  ThunkRegSet.E.EFLAGS.Bits.Reserved_1 = 0;\r
  ThunkRegSet.E.EFLAGS.Bits.Reserved_2 = 0;\r
  ThunkRegSet.E.EFLAGS.Bits.Reserved_3 = 0;\r
  ThunkRegSet.E.EFLAGS.Bits.IOPL       = 3;\r
  ThunkRegSet.E.EFLAGS.Bits.NT         = 0;\r
  ThunkRegSet.E.EFLAGS.Bits.IF         = 1;\r
  ThunkRegSet.E.EFLAGS.Bits.TF         = 0;\r
  ThunkRegSet.E.EFLAGS.Bits.CF         = 0;\r
  \r
  ThunkRegSet.E.EDI  = Regs->E.EDI;\r
  ThunkRegSet.E.ESI  = Regs->E.ESI;\r
  ThunkRegSet.E.EBP  = Regs->E.EBP;\r
  ThunkRegSet.E.EBX  = Regs->E.EBX;\r
  ThunkRegSet.E.EDX  = Regs->E.EDX;\r
  ThunkRegSet.E.ECX  = Regs->E.ECX;\r
  ThunkRegSet.E.EAX  = Regs->E.EAX;\r
  ThunkRegSet.E.DS   = Regs->E.DS;\r
  ThunkRegSet.E.ES   = Regs->E.ES;\r
\r
  //\r
  // The call to Legacy16 is a critical section to EFI\r
  //\r
  Eflags = AsmReadEflags ();\r
  if ((Eflags | EFI_CPU_EFLAGS_IF) != 0) {\r
    DisableInterrupts ();\r
  }\r
\r
  //\r
  // Set Legacy16 state. 0x08, 0x70 is legacy 8259 vector bases.\r
  //\r
  Status = BiosDev->Legacy8259->SetMode (BiosDev->Legacy8259, Efi8259LegacyMode, NULL, NULL);\r
  ASSERT_EFI_ERROR (Status);\r
  \r
  Stack16 = (UINT16 *)((UINT8 *) BiosDev->ThunkContext->RealModeBuffer + BiosDev->ThunkContext->RealModeBufferSize - sizeof (UINT16));\r
\r
  ThunkRegSet.E.SS   = (UINT16) (((UINTN) Stack16 >> 16) << 12);\r
  ThunkRegSet.E.ESP  = (UINT16) (UINTN) Stack16;\r
\r
  ThunkRegSet.E.Eip  = (UINT16)((UINT32 *)NULL)[BiosInt];\r
  ThunkRegSet.E.CS   = (UINT16)(((UINT32 *)NULL)[BiosInt] >> 16);\r
  BiosDev->ThunkContext->RealModeState = &ThunkRegSet;\r
  AsmThunk16 (BiosDev->ThunkContext);\r
  \r
  //\r
  // Restore protected mode interrupt state\r
  //\r
  Status = BiosDev->Legacy8259->SetMode (BiosDev->Legacy8259, Efi8259ProtectedMode, NULL, NULL);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // End critical section\r
  //\r
  if ((Eflags | EFI_CPU_EFLAGS_IF) != 0) {\r
    EnableInterrupts ();\r
  }\r
\r
  Regs->E.EDI      = ThunkRegSet.E.EDI;      \r
  Regs->E.ESI      = ThunkRegSet.E.ESI;  \r
  Regs->E.EBP      = ThunkRegSet.E.EBP;  \r
  Regs->E.EBX      = ThunkRegSet.E.EBX;  \r
  Regs->E.EDX      = ThunkRegSet.E.EDX;  \r
  Regs->E.ECX      = ThunkRegSet.E.ECX;  \r
  Regs->E.EAX      = ThunkRegSet.E.EAX;\r
  Regs->E.SS       = ThunkRegSet.E.SS;\r
  Regs->E.CS       = ThunkRegSet.E.CS;  \r
  Regs->E.DS       = ThunkRegSet.E.DS;  \r
  Regs->E.ES       = ThunkRegSet.E.ES;\r
\r
  CopyMem (&(Regs->E.EFLAGS), &(ThunkRegSet.E.EFLAGS), sizeof (UINT32));\r
\r
  Ret = (BOOLEAN) (Regs->E.EFLAGS.Bits.CF == 1);\r
\r
  return Ret;\r
}\r
\r
\r