diff options
Diffstat (limited to 'BraswellPlatformPkg/Common/Override/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/SecEntry.asm')
| -rw-r--r-- | BraswellPlatformPkg/Common/Override/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/SecEntry.asm | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/BraswellPlatformPkg/Common/Override/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/SecEntry.asm b/BraswellPlatformPkg/Common/Override/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/SecEntry.asm new file mode 100644 index 0000000000..9b2a526549 --- /dev/null +++ b/BraswellPlatformPkg/Common/Override/IntelFspWrapperPkg/Library/SecPeiFspPlatformSecLibSample/Ia32/SecEntry.asm @@ -0,0 +1,340 @@ +;; @file
+; This is the code that goes from real-mode to protected mode.
+; It consumes the reset vector, calls TempRamInit API from FSP binary.
+;
+; Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+;
+; This program and the accompanying materials
+; are licensed and made available under the terms and conditions of the BSD License
+; which accompanies this distribution. The full text of the license may be found at
+; http://opensource.org/licenses/bsd-license.php.
+;
+; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;
+;;
+
+
+#include "Fsp.h"
+
+.686p
+.xmm
+.model small, c
+
+EXTRN CallPeiCoreEntryPoint:NEAR
+EXTRN TempRamInitParams:FAR
+
+; Pcds
+EXTRN PcdGet32 (PcdFlashFvFspBase):DWORD
+EXTRN PcdGet32 (PcdFlashFvFspSize):DWORD
+
+_TEXT_REALMODE SEGMENT PARA PUBLIC USE16 'CODE'
+ ASSUME CS:_TEXT_REALMODE, DS:_TEXT_REALMODE
+
+;----------------------------------------------------------------------------
+;
+; Procedure: _ModuleEntryPoint
+;
+; Input: None
+;
+; Output: None
+;
+; Destroys: Assume all registers
+;
+; Description:
+;
+; Transition to non-paged flat-model protected mode from a
+; hard-coded GDT that provides exactly two descriptors.
+; This is a bare bones transition to protected mode only
+; used for a while in PEI and possibly DXE.
+;
+; After enabling protected mode, a far jump is executed to
+; transfer to PEI using the newly loaded GDT.
+;
+; Return: None
+;
+; MMX Usage:
+; MM0 = BIST State
+; MM5 = Save time-stamp counter value high32bit
+; MM6 = Save time-stamp counter value low32bit.
+;
+;----------------------------------------------------------------------------
+
+align 4
+_ModuleEntryPoint PROC NEAR C PUBLIC
+ fninit ; clear any pending Floating point exceptions
+ ;
+ ; Store the BIST value in mm0
+ ;
+ movd mm0, eax
+
+ ;
+ ; Save time-stamp counter value
+ ; rdtsc load 64bit time-stamp counter to EDX:EAX
+ ;
+ rdtsc
+ movd mm5, edx
+ movd mm6, eax
+
+ ;
+ ; Load the GDT table in GdtDesc
+ ;
+ mov esi, OFFSET GdtDesc
+ DB 66h
+ lgdt fword ptr cs:[si]
+
+ ;
+ ; Transition to 16 bit protected mode
+ ;
+ mov eax, cr0 ; Get control register 0
+ or eax, 00000003h ; Set PE bit (bit #0) & MP bit (bit #1)
+ mov cr0, eax ; Activate protected mode
+
+ mov eax, cr4 ; Get control register 4
+ or eax, 00000600h ; Set OSFXSR bit (bit #9) & OSXMMEXCPT bit (bit #10)
+ mov cr4, eax
+
+ ;
+ ; Now we're in 16 bit protected mode
+ ; Set up the selectors for 32 bit protected mode entry
+ ;
+ mov ax, SYS_DATA_SEL
+ mov ds, ax
+ mov es, ax
+ mov fs, ax
+ mov gs, ax
+ mov ss, ax
+
+ ;
+ ; Transition to Flat 32 bit protected mode
+ ; The jump to a far pointer causes the transition to 32 bit mode
+ ;
+ mov esi, offset ProtectedModeEntryLinearAddress
+ jmp fword ptr cs:[si]
+
+_ModuleEntryPoint ENDP
+_TEXT_REALMODE ENDS
+
+_TEXT_PROTECTED_MODE SEGMENT PARA PUBLIC USE32 'CODE'
+ ASSUME CS:_TEXT_PROTECTED_MODE, DS:_TEXT_PROTECTED_MODE
+
+;----------------------------------------------------------------------------
+;
+; Procedure: ProtectedModeEntryPoint
+;
+; Input: None
+;
+; Output: None
+;
+; Destroys: Assume all registers
+;
+; Description:
+;
+; This function handles:
+; Call two basic APIs from FSP binary
+; Initializes stack with some early data (BIST, PEI entry, etc)
+;
+; Return: None
+;
+;----------------------------------------------------------------------------
+
+align 4
+ProtectedModeEntryPoint PROC NEAR PUBLIC
+
+ ; Find the fsp info header
+ mov edi, PcdGet32 (PcdFlashFvFspBase)
+ mov ecx, PcdGet32 (PcdFlashFvFspSize)
+
+ mov eax, dword ptr [edi + FVH_SIGINATURE_OFFSET]
+ cmp eax, FVH_SIGINATURE_VALID_VALUE
+ jnz FspHeaderNotFound
+
+ xor eax, eax
+ mov ax, word ptr [edi + FVH_EXTHEADER_OFFSET_OFFSET]
+ cmp ax, 0
+ jnz FspFvExtHeaderExist
+
+ xor eax, eax
+ mov ax, word ptr [edi + FVH_HEADER_LENGTH_OFFSET] ; Bypass Fv Header
+ add edi, eax
+ jmp FspCheckFfsHeader
+
+FspFvExtHeaderExist:
+ add edi, eax
+ mov eax, dword ptr [edi + FVH_EXTHEADER_SIZE_OFFSET] ; Bypass Ext Fv Header
+ add edi, eax
+
+ ; Round up to 8 byte alignment
+ mov eax, edi
+ and al, 07h
+ jz FspCheckFfsHeader
+
+ and edi, 0FFFFFFF8h
+ add edi, 08h
+
+FspCheckFfsHeader:
+ ; Check the ffs guid
+ mov eax, dword ptr [edi]
+ cmp eax, FSP_HEADER_GUID_DWORD1
+ jnz FspHeaderNotFound
+
+ mov eax, dword ptr [edi + 4]
+ cmp eax, FSP_HEADER_GUID_DWORD2
+ jnz FspHeaderNotFound
+
+ mov eax, dword ptr [edi + 8]
+ cmp eax, FSP_HEADER_GUID_DWORD3
+ jnz FspHeaderNotFound
+
+ mov eax, dword ptr [edi + 0Ch]
+ cmp eax, FSP_HEADER_GUID_DWORD4
+ jnz FspHeaderNotFound
+
+ add edi, FFS_HEADER_SIZE_VALUE ; Bypass the ffs header
+
+ ; Check the section type as raw section
+ mov al, byte ptr [edi + SECTION_HEADER_TYPE_OFFSET]
+ cmp al, 019h
+ jnz FspHeaderNotFound
+
+ add edi, RAW_SECTION_HEADER_SIZE_VALUE ; Bypass the section header
+ jmp FspHeaderFound
+
+FspHeaderNotFound:
+ jmp $
+
+FspHeaderFound:
+ ; Get the fsp TempRamInit Api address
+ mov eax, dword ptr [edi + FSP_HEADER_IMAGEBASE_OFFSET]
+ add eax, dword ptr [edi + FSP_HEADER_TEMPRAMINIT_OFFSET]
+
+ ; Setup the hardcode stack
+ mov esp, OFFSET TempRamInitStack
+
+ ; Call the fsp TempRamInit Api
+ jmp eax
+
+TempRamInitDone:
+ cmp eax, 0
+ jnz FspApiFailed
+
+ ; ECX: start of range
+ ; EDX: end of range
+ mov esp, edx
+ push edx
+ push ecx
+ push eax ; zero - no hob list yet
+ call CallPeiCoreEntryPoint
+
+FspApiFailed:
+ jmp $
+
+align 10h
+TempRamInitStack:
+ DD OFFSET TempRamInitDone
+ DD OFFSET TempRamInitParams
+
+ProtectedModeEntryPoint ENDP
+
+;
+; ROM-based Global-Descriptor Table for the Tiano PEI Phase
+;
+align 16
+PUBLIC BootGdtTable
+
+;
+; GDT[0]: 0x00: Null entry, never used.
+;
+NULL_SEL EQU $ - GDT_BASE ; Selector [0]
+GDT_BASE:
+BootGdtTable DD 0
+ DD 0
+;
+; Linear data segment descriptor
+;
+LINEAR_SEL EQU $ - GDT_BASE ; Selector [0x8]
+ DW 0FFFFh ; limit 0xFFFFF
+ DW 0 ; base 0
+ DB 0
+ DB 092h ; present, ring 0, data, expand-up, writable
+ DB 0CFh ; page-granular, 32-bit
+ DB 0
+;
+; Linear code segment descriptor
+;
+LINEAR_CODE_SEL EQU $ - GDT_BASE ; Selector [0x10]
+ DW 0FFFFh ; limit 0xFFFFF
+ DW 0 ; base 0
+ DB 0
+ DB 09Bh ; present, ring 0, data, expand-up, not-writable
+ DB 0CFh ; page-granular, 32-bit
+ DB 0
+;
+; System data segment descriptor
+;
+SYS_DATA_SEL EQU $ - GDT_BASE ; Selector [0x18]
+ DW 0FFFFh ; limit 0xFFFFF
+ DW 0 ; base 0
+ DB 0
+ DB 093h ; present, ring 0, data, expand-up, not-writable
+ DB 0CFh ; page-granular, 32-bit
+ DB 0
+
+;
+; System code segment descriptor
+;
+SYS_CODE_SEL EQU $ - GDT_BASE ; Selector [0x20]
+ DW 0FFFFh ; limit 0xFFFFF
+ DW 0 ; base 0
+ DB 0
+ DB 09Ah ; present, ring 0, data, expand-up, writable
+ DB 0CFh ; page-granular, 32-bit
+ DB 0
+;
+; Spare segment descriptor
+;
+SYS16_CODE_SEL EQU $ - GDT_BASE ; Selector [0x28]
+ DW 0FFFFh ; limit 0xFFFFF
+ DW 0 ; base 0
+ DB 0Eh ; Changed from F000 to E000.
+ DB 09Bh ; present, ring 0, code, expand-up, writable
+ DB 00h ; byte-granular, 16-bit
+ DB 0
+;
+; Spare segment descriptor
+;
+SYS16_DATA_SEL EQU $ - GDT_BASE ; Selector [0x30]
+ DW 0FFFFh ; limit 0xFFFF
+ DW 0 ; base 0
+ DB 0
+ DB 093h ; present, ring 0, data, expand-up, not-writable
+ DB 00h ; byte-granular, 16-bit
+ DB 0
+
+;
+; Spare segment descriptor
+;
+SPARE5_SEL EQU $ - GDT_BASE ; Selector [0x38]
+ DW 0 ; limit 0
+ DW 0 ; base 0
+ DB 0
+ DB 0 ; present, ring 0, data, expand-up, writable
+ DB 0 ; page-granular, 32-bit
+ DB 0
+GDT_SIZE EQU $ - BootGdtTable ; Size, in bytes
+
+;
+; GDT Descriptor
+;
+GdtDesc: ; GDT descriptor
+ DW GDT_SIZE - 1 ; GDT limit
+ DD OFFSET BootGdtTable ; GDT base address
+
+
+ProtectedModeEntryLinearAddress LABEL FWORD
+ProtectedModeEntryLinearOffset LABEL DWORD
+ DD OFFSET ProtectedModeEntryPoint ; Offset of our 32 bit code
+ DW LINEAR_CODE_SEL
+
+_TEXT_PROTECTED_MODE ENDS
+END
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