167 lines
2.1 KiB
NASM
167 lines
2.1 KiB
NASM
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;
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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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; bllrb0.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 reloader.
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;
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; Environment:
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;
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; Boot reloader.
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;
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;--
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.code
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externdef main:NEAR
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;++
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;
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; VOID
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; BlLrbEnter(
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; uint pConfig, ulong pVars
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; )
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;
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; Routine Description:
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;
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; This function adjusts the stack, then enters the C code.
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;
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;--
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BlLrbEnter proc
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mov edx, [rsp+8]
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mov ecx, [rsp]
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mov rsp, 07b00h
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jmp main
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BlLrbEnter endp
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;++
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;
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; ULONG_PTR
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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 proc
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mov rax, cr3
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ret
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BlMmGetCr3 endp
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;++
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;
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; VOID
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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 proc
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mov cr3, rcx
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ret
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BlMmSetCr3 endp
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;++
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;
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; VOID
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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 proc
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sgdt fword ptr [rcx]
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ret
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BlMmGetGdtr endp
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;++
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;
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; VOID
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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 proc
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lgdt fword ptr [rcx]
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ret
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BlMmSetGdtr endp
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;++
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;
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; ULONG_PTR
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; BlMmGetRsp(
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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 RSP register.
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;
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; Return Value:
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;
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; Value of the RSP register.
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;
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;--
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BlMmGetRsp proc
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mov rax, rsp
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ret
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BlMmGetRsp endp
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end
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