| 1 | ; $Id: bs3-cmn-KbdRead.asm 82968 2020-02-04 10:35:17Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - Bs3KbdRead.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2007-2020 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 | ; The contents of this file may alternatively be used under the terms
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| 18 | ; of the Common Development and Distribution License Version 1.0
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| 19 | ; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | ; VirtualBox OSE distribution, in which case the provisions of the
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| 21 | ; CDDL are applicable instead of those of the GPL.
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| 22 | ;
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| 23 | ; You may elect to license modified versions of this file under the
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| 24 | ; terms and conditions of either the GPL or the CDDL or both.
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| 25 | ;
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| 26 |
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| 27 | %include "bs3kit-template-header.mac"
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| 28 |
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| 29 |
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| 30 | ;;
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| 31 | ; Sends a read command to the keyboard controller and gets the result.
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| 32 | ;
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| 33 | ; The caller is responsible for making sure the keyboard controller is ready
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| 34 | ; for a command (call Bs3KbdWait if unsure).
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| 35 | ;
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| 36 | ; @returns The value read is returned (in al).
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| 37 | ; @param bCmd The read command.
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| 38 | ; @uses al (obviously)
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| 39 | ;
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| 40 | ; @cproto BS3_DECL(uint8_t) Bs3KbdRead_c16(uint8_t bCmd);
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| 41 | ;
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| 42 | BS3_PROC_BEGIN_CMN Bs3KbdRead, BS3_PBC_NEAR
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| 43 | push xBP
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| 44 | mov xBP, xSP
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| 45 |
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| 46 | mov al, [xBP + xCB*2]
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| 47 | out 64h, al ; Write the command.
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| 48 |
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| 49 | .check_status:
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| 50 | in al, 64h
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| 51 | test al, 1 ; KBD_STAT_OBF
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| 52 | jz .check_status
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| 53 |
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| 54 | in al, 60h ; Read the data.
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| 55 |
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| 56 | pop xBP
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| 57 | BS3_HYBRID_RET
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| 58 | BS3_PROC_END_CMN Bs3KbdRead
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| 59 |
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| 60 | ;
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| 61 | ; We may be using the near code in some critical code paths, so don't
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| 62 | ; penalize it.
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| 63 | ;
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| 64 | BS3_CMN_FAR_STUB Bs3KbdRead, 2
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| 65 |
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