Minoca-os/uefi/archlib/x86/archsup.S

/*++

Copyright (c) 2014 Minoca Corp. All Rights Reserved

Module Name:

    archsup.S

Abstract:

    This module architecture specific support routines.

Author:

    Evan Green 7-Apr-2014

Environment:

    Firmware

--*/

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## ------------------------------------------------------------------ Includes
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#include <minoca/kernel/x86.inc>

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## ---------------------------------------------------------------------- Code
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## .text specifies that this code belongs in the executable section.
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## .code32 specifies that this is 32-bit protected mode code.
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.text
.code32

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## VOID
## EfiMemoryBarrier (
##     VOID
##     )
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/*++

Routine Description:

    This routine provides a full memory barrier, ensuring that all memory
    accesses occurring before this function complete before any memory accesses
    after this function start.

Arguments:

    None.

Return Value:

    None.

--*/

FUNCTION(EfiMemoryBarrier)
    sub     $4, %esp
    lock add $1, (%esp)
    add     $4, %esp
    ret

END_FUNCTION(EfiMemoryBarrier)

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## --------------------------------------------------------- Internal Functions
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