From: Hervé Poussineau <hpous...@reactos.org>
The RCR I/O port (0xcf9) is used to generate a hard reset or a soft reset.
Acked-by: Michael S. Tsirkin <m...@redhat.com>
Acked-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Hervé Poussineau <hpous...@reactos.org>
---
hw/isa/piix4.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/hw/isa/piix4.c b/hw/isa/piix4.c
index 314f7f7359..13f4eaa2dd 100644
--- a/hw/isa/piix4.c
+++ b/hw/isa/piix4.c
@@ -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
@@ -33,6 +34,10 @@ PCIDevice *piix4_dev;
typedef struct PIIX4State {
PCIDevice dev;
+
+ /* Reset Control Register */
+ MemoryRegion rcr_mem;
+ uint8_t rcr;
} PIIX4State;
#define TYPE_PIIX4_PCI_DEVICE "PIIX4"
@@ -87,6 +92,34 @@ 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 *pci_dev, Error **errp)
{
DeviceState *dev = DEVICE(pci_dev);
@@ -96,6 +129,12 @@ static void piix4_realize(PCIDevice *pci_dev, Error **errp)
pci_address_space_io(pci_dev), errp)) {
return;
}
+
+ 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(pci_dev), 0xcf9,
+ &s->rcr_mem, 1);
+
piix4_dev = pci_dev;
}
--
2.15.1
