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piix4: Add the Reset Control Register 

The RCR I/O port (0xcf9) is used to generate a hard reset or a soft reset.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Message-Id: <20171216090228.28505-7-hpoussin@reactos.org>
Reviewed-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
[PMD: rebased, updated includes]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
Hervé Poussineau 2018-01-06 16:37:20 +01:00 committed by Philippe Mathieu-Daudé
parent 10386385bc
commit 5790b757cf
1 changed files with 46 additions and 3 deletions
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49
hw/isa/piix4.c
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@ -2,6 +2,7 @@
* QEMU PIIX4 PCI Bridge Emulation
*
* Copyright (c) 2006 Fabrice Bellard
* Copyright (c) 2018 Hervé Poussineau
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
@ -28,11 +29,17 @@
#include "hw/isa/isa.h"
#include "hw/sysbus.h"
#include "migration/vmstate.h"
#include "sysemu/reset.h"
#include "sysemu/runstate.h"
PCIDevice *piix4_dev;
typedef struct PIIX4State {
PCIDevice dev;
/* Reset Control Register */
MemoryRegion rcr_mem;
uint8_t rcr;
} PIIX4State;
#define TYPE_PIIX4_PCI_DEVICE "PIIX4"
@ -87,15 +94,51 @@ static const VMStateDescription vmstate_piix4 = {
}
};
static void piix4_rcr_write(void *opaque, hwaddr addr, uint64_t val,
unsigned int len)
{
PIIX4State *s = opaque;
if (val & 4) {
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
return;
}
s->rcr = val & 2; /* keep System Reset type only */
}
static uint64_t piix4_rcr_read(void *opaque, hwaddr addr, unsigned int len)
{
PIIX4State *s = opaque;
return s->rcr;
}
static const MemoryRegionOps piix4_rcr_ops = {
.read = piix4_rcr_read,
.write = piix4_rcr_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl = {
.min_access_size = 1,
.max_access_size = 1,
},
};
static void piix4_realize(PCIDevice *dev, Error **errp)
{
PIIX4State *d = PIIX4_PCI_DEVICE(dev);
PIIX4State *s = PIIX4_PCI_DEVICE(dev);
if (!isa_bus_new(DEVICE(d), pci_address_space(dev),
if (!isa_bus_new(DEVICE(dev), pci_address_space(dev),
pci_address_space_io(dev), errp)) {
return;
}
piix4_dev = &d->dev;
memory_region_init_io(&s->rcr_mem, OBJECT(dev), &piix4_rcr_ops, s,
"reset-control", 1);
memory_region_add_subregion_overlap(pci_address_space_io(dev),
RCR_IOPORT, &s->rcr_mem, 1);
piix4_dev = dev;
}
int piix4_init(PCIBus *bus, ISABus **isa_bus, int devfn)