| 1 | ; $Id: bs3-cmn-KbdRead.asm 98103 2023-01-17 14:15:46Z 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) 2007-2023 Oracle and/or its affiliates.
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| 8 | ;
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| 9 | ; This file is part of VirtualBox base platform packages, as
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| 10 | ; available from https://www.virtualbox.org.
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| 11 | ;
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| 12 | ; This program is free software; you can redistribute it and/or
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| 13 | ; modify it under the terms of the GNU General Public License
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| 14 | ; as published by the Free Software Foundation, in version 3 of the
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| 15 | ; License.
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| 16 | ;
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| 17 | ; This program is distributed in the hope that it will be useful, but
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| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | ; General Public License for more details.
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| 21 | ;
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| 22 | ; You should have received a copy of the GNU General Public License
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| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | ;
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| 25 | ; The contents of this file may alternatively be used under the terms
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| 26 | ; of the Common Development and Distribution License Version 1.0
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| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | ; in the VirtualBox distribution, in which case the provisions of the
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| 29 | ; CDDL are applicable instead of those of the GPL.
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| 30 | ;
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| 31 | ; You may elect to license modified versions of this file under the
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| 32 | ; terms and conditions of either the GPL or the CDDL or both.
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| 33 | ;
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| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | ;
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| 36 |
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| 37 | %include "bs3kit-template-header.mac"
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| 38 |
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| 39 |
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| 40 | ;;
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| 41 | ; Sends a read command to the keyboard controller and gets the result.
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| 42 | ;
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| 43 | ; The caller is responsible for making sure the keyboard controller is ready
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| 44 | ; for a command (call Bs3KbdWait if unsure).
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| 45 | ;
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| 46 | ; @returns The value read is returned (in al).
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| 47 | ; @param bCmd The read command.
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| 48 | ; @uses al (obviously)
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| 49 | ;
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| 50 | ; @cproto BS3_DECL(uint8_t) Bs3KbdRead_c16(uint8_t bCmd);
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| 51 | ;
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| 52 | BS3_PROC_BEGIN_CMN Bs3KbdRead, BS3_PBC_NEAR
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| 53 | push xBP
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| 54 | mov xBP, xSP
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| 55 |
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| 56 | mov al, [xBP + xCB*2]
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| 57 | out 64h, al ; Write the command.
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| 58 |
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| 59 | .check_status:
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| 60 | in al, 64h
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| 61 | test al, 1 ; KBD_STAT_OBF
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| 62 | jz .check_status
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| 63 |
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| 64 | in al, 60h ; Read the data.
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| 65 |
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| 66 | pop xBP
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| 67 | BS3_HYBRID_RET
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| 68 | BS3_PROC_END_CMN Bs3KbdRead
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| 69 |
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| 70 | ;
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| 71 | ; We may be using the near code in some critical code paths, so don't
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| 72 | ; penalize it.
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| 73 | ;
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| 74 | BS3_CMN_FAR_STUB Bs3KbdRead, 2
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| 75 |
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