diff options
Diffstat (limited to 'IntelFspPkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.asm')
| -rw-r--r-- | IntelFspPkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.asm | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/IntelFspPkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.asm b/IntelFspPkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.asm deleted file mode 100644 index 391fdf893a..0000000000 --- a/IntelFspPkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.asm +++ /dev/null @@ -1,183 +0,0 @@ -;; @file
-; This is the code that goes from real-mode to protected mode.
-; It consumes the reset vector, configures the stack.
-;
-; 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.
-;;
-
-;
-; Define assembler characteristics
-;
-.586p
-.xmm
-.model flat, c
-
-EXTRN TempRamInitApi:NEAR
-EXTRN FspInitApi:NEAR
-
-;
-; Contrary to the name, this file contains 16 bit code as well.
-;
-_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
-;
-;----------------------------------------------------------------------------
-align 16
-_ModuleEntryPoint PROC C PUBLIC
- ;
- ; 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
-
- ;
- ; 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
-
-.code
-;
-; Protected mode portion initializes stack, configures cache, and calls C entry point
-;
-
-;----------------------------------------------------------------------------
-;
-; Procedure: ProtectedModeEntryPoint
-;
-; Input: Executing in 32 Bit Protected (flat) mode
-; cs: 0-4GB
-; ds: 0-4GB
-; es: 0-4GB
-; fs: 0-4GB
-; gs: 0-4GB
-; ss: 0-4GB
-;
-; Output: This function never returns
-;
-; Destroys:
-; ecx
-; edi
-; esi
-; esp
-;
-; Description:
-; Perform any essential early platform initilaisation
-; Setup a stack
-;
-;----------------------------------------------------------------------------
-
-ProtectedModeEntryPoint PROC NEAR C PUBLIC
- ;
- ; Dummy function. Consume 2 API to make sure they can be linked.
- ;
- mov eax, TempRamInitApi
- mov eax, FspInitApi
-
- ; Should never return
- jmp $
-
-ProtectedModeEntryPoint ENDP
-
-;
-; ROM-based Global-Descriptor Table for the 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 code segment descriptor
-;
-LINEAR_CODE_SEL equ $ - GDT_BASE ; Selector [0x8]
- DW 0FFFFh ; limit 0xFFFF
- 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 [0x10]
- DW 0FFFFh ; limit 0xFFFF
- DW 0 ; base 0
- DB 0
- DB 093h ; present, ring 0, data, expand-up, not-writable
- DB 0CFh ; 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
-
-END
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