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https://github.com/CloverHackyColor/CloverBootloader.git
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63 lines
1.4 KiB
NASM
63 lines
1.4 KiB
NASM
;; @file
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; This is the assembly code for transferring to control to OS S3 waking vector
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; for IA32 platform
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;
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; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;;
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SECTION .text
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global ASM_PFX(AsmFixAddress16)
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global ASM_PFX(AsmJmpAddr32)
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;-----------------------------------------
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;VOID
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;AsmTransferControl (
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; IN UINT32 S3WakingVector,
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; IN UINT32 AcpiLowMemoryBase
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; );
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;-----------------------------------------
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global ASM_PFX(AsmTransferControl)
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ASM_PFX(AsmTransferControl):
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; S3WakingVector :DWORD
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; AcpiLowMemoryBase :DWORD
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push ebp
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mov ebp, esp
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lea eax, [.0]
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push 0x28 ; CS
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push eax
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mov ecx, [ebp + 8]
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shrd ebx, ecx, 20
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and ecx, 0xf
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mov bx, cx
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mov [@jmp_addr + 1], ebx
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retf
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BITS 16
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.0:
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mov ax, 0x30
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o32 mov ds, eax
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o32 mov es, eax
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o32 mov fs, eax
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o32 mov gs, eax
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o32 mov ss, eax
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mov eax, cr0 ; Get control register 0
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and eax, 0x0fffffffe ; Clear PE bit (bit #0)
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mov cr0, eax ; Activate real mode
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@jmp_addr:
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jmp 0x0:0x0
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global ASM_PFX(AsmTransferControl32)
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ASM_PFX(AsmTransferControl32):
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jmp ASM_PFX(AsmTransferControl)
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; dummy
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global ASM_PFX(AsmTransferControl16)
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ASM_PFX(AsmTransferControl16):
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ASM_PFX(AsmFixAddress16): DD 0
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ASM_PFX(AsmJmpAddr32): DD 0
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