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/*
* plex86: run multiple x86 operating systems concurrently
* Copyright (C) 1999-2001 Kevin P. Lawton
*
* flag-nexus.c: virtualized x86 eflags handling
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "plex86.h"
#define IN_NEXUS_SPACE
#include "monitor.h"
/* Note: Used by both host/monitor spaces */
void
write_eflags(vm_t *vm, Bit32u raw, Bit32u change_mask)
{
Bit32u change_virtualized_mask, change_unvirtualized_mask;
Bit32u prevIF;
prevIF = vm->guest_cpu.veflags.fields.if_;
/* Modify the guest eflags, by changing only those bits specified */
/* in change_mask. */
/* Set virtualized eflags fields in guest_cpu.veflags */
change_virtualized_mask = change_mask & VirtualizedEflags;
vm->guest_cpu.veflags.raw =
(vm->guest_cpu.veflags.raw & ~change_virtualized_mask) |
(raw & change_virtualized_mask);
/* Set unvirtualized eflags fields in the guest_context->eflags */
change_unvirtualized_mask = change_mask & ~VirtualizedEflags;
vm->addr->guest_context->eflags.raw =
(vm->addr->guest_context->eflags.raw & ~change_unvirtualized_mask) |
(raw & change_unvirtualized_mask);
if (vm->addr->guest_context->eflags.raw & FLG_TF)
vm->guest_cpu.async_event = 1;
if (!prevIF && vm->guest_cpu.veflags.fields.if_) {
/* Transition from IF==0 to 1. */
vm->guest_cpu.async_event = 1;
}
}
/* Note: Used by both host/monitor spaces */
Bit32u
read_eflags(vm_t *vm)
{
Bit32u eflags;
eflags =
(vm->guest_cpu.veflags.raw & VirtualizedEflags) |
(vm->addr->guest_context->eflags.raw & ~VirtualizedEflags);
return(eflags);
}
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