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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:17:27 +0000 |
| commit | f215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch) | |
| tree | 6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm | |
| parent | Initial commit. (diff) | |
| download | virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip | |
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm')
| -rw-r--r-- | src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm b/src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm new file mode 100644 index 00000000..e004de2d --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/IntelFsp2Pkg/Library/SecFspSecPlatformLibNull/Ia32/Flat32.nasm @@ -0,0 +1,121 @@ +;; @file +; This is the code that goes from real-mode to protected mode. +; It consumes the reset vector, configures the stack. +; +; Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR> +; SPDX-License-Identifier: BSD-2-Clause-Patent +;; + +; +; Define assembler characteristics +; + +extern ASM_PFX(TempRamInitApi) + +SECTION .text + +%macro RET_ESI 0 + + movd esi, mm7 ; restore ESP from MM7 + jmp esi + +%endmacro + +; +; Perform early platform initialization +; +global ASM_PFX(SecPlatformInit) +ASM_PFX(SecPlatformInit): + + RET_ESI + +; +; 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 initialisation +; Setup a stack +; +;---------------------------------------------------------------------------- +global ASM_PFX(ProtectedModeEntryPoint) +ASM_PFX(ProtectedModeEntryPoint): + ; + ; Dummy function. Consume 2 API to make sure they can be linked. + ; + mov eax, ASM_PFX(TempRamInitApi) + + ; Should never return + jmp $ + +; +; ROM-based Global-Descriptor Table for the PEI Phase +; +align 16 +global ASM_PFX(BootGdtTable) + +; +; GDT[0]: 0x00: Null entry, never used. +; +NULL_SEL equ $ - GDT_BASE ; Selector [0] +GDT_BASE: +ASM_PFX(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 $ - GDT_BASE ; Size, in bytes + +; +; GDT Descriptor +; +GdtDesc: ; GDT descriptor + DW GDT_SIZE - 1 ; GDT limit + DD GDT_BASE ; GDT base address + +global ASM_PFX(ProtectedModeEntryLinearAddress) +global ASM_PFX(ProtectedModeEntryLinearOffset) + +ASM_PFX(ProtectedModeEntryLinearAddress): +ASM_PFX(ProtectedModeEntryLinearOffset): + DD ASM_PFX(ProtectedModeEntryPoint) ; Offset of our 32 bit code + DW LINEAR_CODE_SEL + |