| 1 | ; $Id: bs3-timers-1-asm.asm 100782 2023-08-03 01:15:55Z vboxsync $
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| 2 | ;; @file
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| 3 | ; BS3Kit - bs3-timers-1
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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 |
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| 38 | ;*********************************************************************************************************************************
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| 39 | ;* Header Files *
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| 40 | ;*********************************************************************************************************************************
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| 41 | %include "bs3kit.mac"
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| 42 |
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| 43 |
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| 44 | BS3_BEGIN_X0TEXT16
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| 45 |
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| 46 | BS3_PROC_BEGIN NAME(bs3Timers1StiHltCli)
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| 47 | ;
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| 48 | ; Assuming interrupts are disabled on entry, the STI instruction should
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| 49 | ; inhibit interrupts till after HLT, but they should be delivered before
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| 50 | ; CLI is executed and takes effect.
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| 51 | ;
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| 52 | sti
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| 53 | hlt
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| 54 | ; Interrupts should be delivered here.
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| 55 | BS3_GLOBAL_NAME_EX NAME(bs3Timers1StiHltCli_IrqPc), function, 1
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| 56 | cli
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| 57 |
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| 58 | ret
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| 59 | BS3_PROC_END NAME(bs3Timers1StiHltCli)
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| 60 |
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| 61 |
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| 62 | BS3_PROC_BEGIN NAME(bs3Timers1StiStiCli)
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| 63 | ;
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| 64 | ; Assuming interrupts are disabled on entry, the first STI instruction
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| 65 | ; should inhibit interrupts, whereas the next should not since interrupts
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| 66 | ; are enabled now, so interrupts should be delivered after the 2nd STI and
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| 67 | ; before the CLI is executed and takes effect.
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| 68 | ;
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| 69 | sti
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| 70 | sti
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| 71 | ; Interrupts should be delivered here.
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| 72 | BS3_GLOBAL_NAME_EX NAME(bs3Timers1StiStiCli_IrqPc), function, 1
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| 73 | cli
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| 74 |
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| 75 | ret
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| 76 | BS3_PROC_END NAME(bs3Timers1StiStiCli)
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| 77 |
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| 78 |
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| 79 | BS3_PROC_BEGIN NAME(bs3Timers1PopfCli)
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| 80 | ;
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| 81 | ; Assuming interrupts are disabled on entry, the POPF instruction should
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| 82 | ; enable interrupts with immediate effect, so they should be delivered
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| 83 | ; before the CLI is executed and takes effect.
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| 84 | ;
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| 85 | push xAX
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| 86 |
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| 87 | xPUSHF
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| 88 | pop xAX
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| 89 | or xAX, X86_EFL_IF
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| 90 | push xAX
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| 91 | xPOPF
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| 92 | ; Interrupts should be delivered here.
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| 93 | BS3_GLOBAL_NAME_EX NAME(bs3Timers1PopfCli_IrqPc), function, 1
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| 94 | cli
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| 95 |
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| 96 | pop xAX
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| 97 | ret
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| 98 | BS3_PROC_END NAME(bs3Timers1PopfCli)
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| 99 |
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| 100 |
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| 101 | BS3_PROC_BEGIN NAME(bs3Timers1StiCli)
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| 102 | ;
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| 103 | ; Assuming interrupts are disabled on entry, the STI instruction should
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| 104 | ; inhibit interrupts for one instruction, when that instruction is CLI
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| 105 | ; no interrupt can be delivered.
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| 106 | ;
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| 107 | ; This is a negative test.
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| 108 | ;
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| 109 | sti
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| 110 | cli
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| 111 |
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| 112 | ret
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| 113 | BS3_PROC_END NAME(bs3Timers1StiCli)
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| 114 |
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| 115 |
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| 116 | BS3_PROC_BEGIN NAME(bs3Timers1StiPopf)
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| 117 | ;
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| 118 | ; Assuming interrupts are disabled on entry, the STI instruction should
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| 119 | ; inhibit interrupts for one instruction, when that instruction is a
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| 120 | ; POPF loading EFLAGS with IF=0 no interrupt can be delivered.
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| 121 | ;
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| 122 | ; This is a negative test.
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| 123 | ;
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| 124 | push xAX
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| 125 |
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| 126 | pushf ; save eflags with IF=0
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| 127 | sti ; set IF=1
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| 128 | popf ; load eflags setting IF=0
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| 129 |
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| 130 | pop xAX
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| 131 | ret
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| 132 | BS3_PROC_END NAME(bs3Timers1StiPopf)
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| 133 |
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