341 lines
4.4 KiB
NASM
341 lines
4.4 KiB
NASM
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; Copyright (c) Microsoft Corporation
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;
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; Module Name:
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;
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; blutilasm.asm
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;
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; Abstract:
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;
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; This module implements utility functions for the boot loader.
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;
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; Environment:
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;
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; Boot loader.
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;
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;--
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include bl.inc
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.686p
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.model flat
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.code
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assume ds:flat
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assume es:flat
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assume ss:flat
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assume fs:flat
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;++
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;
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; ULONG_PTR
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; FASTCALL
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; BlMmGetCr3(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function queries the CR3 register.
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;
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; Return Value:
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;
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; Value of the CR3 register.
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;
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;--
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?BlMmGetCr3@@YIKXZ proc
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mov eax, cr3
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ret
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?BlMmGetCr3@@YIKXZ endp
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;++
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;
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; VOID
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; FASTCALL
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; BlMmSetCr3(
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; ULONG_PTR Value
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; )
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;
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; Routine Description:
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;
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; This function sets the CR3 register.
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;
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; Arguments:
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;
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; Value - Supplies the value to write to the CR3 register.
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;
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;--
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?BlMmSetCr3@@YIXK@Z proc
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mov cr3, ecx
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ret
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?BlMmSetCr3@@YIXK@Z endp
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;++
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;
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; VOID
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; FASTCALL
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; BlMmGetGdtr(
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; PGDTR Gdtr
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; )
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;
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; Routine Description:
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;
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; This function queries the GDTR register.
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;
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; Arguments:
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;
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; Gdtr - Receives the contents of the GDTR register.
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;
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;--
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?BlMmGetGdtr@@YIXPAU_GDTR@@@Z proc
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sgdt fword ptr [ecx]
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ret
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?BlMmGetGdtr@@YIXPAU_GDTR@@@Z endp
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;++
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;
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; VOID
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; FASTCALL
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; BlMmSetGdtr(
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; PGDTR Gdtr
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; )
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;
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; Routine Description:
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;
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; This function sets the GDTR register.
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;
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; Arguments:
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;
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; Gdtr - Supplies the data to write to the GDTR register.
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;
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;--
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?BlMmSetGdtr@@YIXPAU_GDTR@@@Z proc
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lgdt fword ptr [ecx]
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ret
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?BlMmSetGdtr@@YIXPAU_GDTR@@@Z endp
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;++
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;
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; USHORT
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; FASTCALL
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; BlMmGetFs(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function queries the FS register.
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;
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; Return Value:
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;
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; Value of the FS register.
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;
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;--
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@BlMmGetFs@0 proc
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mov ax, fs
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ret
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@BlMmGetFs@0 endp
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;++
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;
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; VOID
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; FASTCALL
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; BlMmSetFs(
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; USHORT Value
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; )
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;
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; Routine Description:
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;
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; This function sets the FS register.
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;
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; Arguments:
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;
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; Value - Supplies the value to write to the FS register.
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;
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;--
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?BlMmSetFs@@YIXG@Z proc
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mov fs, cx
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ret
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?BlMmSetFs@@YIXG@Z endp
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;++
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;
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; VOID
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; FASTCALL
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; BlMmSwitchStack(
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; PVOID Stack,
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; PVOID Function
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; )
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;
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; Routine Description:
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;
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; This function switches the stack and calls the specified function.
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;
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; Arguments:
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;
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; Stack - Supplies the stack to switch to.
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;
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; Function - Supplies the function to call.
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;
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;--
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?BlMmSwitchStack@@YIXPAX0@Z proc
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mov esp, ecx
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call edx
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@@:
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jmp @b
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?BlMmSwitchStack@@YIXPAX0@Z endp
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;++
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;
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; PVOID
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; FASTCALL
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; BlRtlGetEbp(
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; VOID
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; )
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;
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; Routine Description:
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;
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; This function queries the value of the EBP register.
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;
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; Return Value:
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;
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; Value of the EBP register.
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;
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;--
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?BlRtlGetEbp@@YIPAXXZ proc
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mov eax, ebp
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ret
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?BlRtlGetEbp@@YIPAXXZ endp
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;++
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;
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; UINT
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; BlGetCpuidEax(
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; UINT reg
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; )
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;
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; Routine Description:
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;
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; This function queries the CPUID.
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;
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; Return Value:
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;
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; Value of the EAX register.
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;
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;--
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?BlGetCpuidEax@@YIKK@Z proc
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mov eax, ecx
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cpuid
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ret
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?BlGetCpuidEax@@YIKK@Z endp
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;++
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;
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; UINT
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; BlGetCpuidEbx(
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; UINT reg
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; )
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;
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; Routine Description:
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;
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; This function queries the CPUID.
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;
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; Return Value:
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;
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; Value of the EBX register.
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;
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;--
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?BlGetCpuidEbx@@YIKK@Z proc
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mov eax, ecx
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cpuid
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mov ebx, eax
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ret
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?BlGetCpuidEbx@@YIKK@Z endp
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;++
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;
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; UINT
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; BlGetCpuidEcx(
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; UINT reg
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; )
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;
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; Routine Description:
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;
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; This function queries the CPUID.
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;
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; Return Value:
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;
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; Value of the ECX register.
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;
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;--
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?BlGetCpuidEcx@@YIKK@Z proc
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mov eax, ecx
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cpuid
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mov eax, ecx
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ret
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?BlGetCpuidEcx@@YIKK@Z endp
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;++
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;
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; UINT
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; BlGetCpuidEdx(
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; UINT reg
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; )
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;
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; Routine Description:
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;
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; This function queries the CPUID.
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;
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; Return Value:
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;
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; Value of the EDX register.
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;
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;--
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?BlGetCpuidEdx@@YIKK@Z proc
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mov eax, ecx
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cpuid
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mov eax, edx
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ret
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?BlGetCpuidEdx@@YIKK@Z endp
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end
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