Just as other devices do.
Signed-off-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <1536901871-2729-1-git-send-email-liq3ea@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Also change the write callback name.
Signed-off-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <20180912160118.21158-5-liq3ea@163.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This contains the offset of the IDE controller within the macio address space
and is required to allow the address to be included within the fw path.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
As the in-built IDE controller is attached to the macio bus then we should also
model this the same in QEMU to aid fw path generation.
Note that all existing macio devices are moved onto the new macio bus so that
the qdev tree accurately reflects the real hardware.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Merge remote-tracking branch 'remotes/juanquintela/tags/check/20180822' into staging
check/next for 20180822
# gpg: Signature made Wed 22 Aug 2018 09:03:40 BST
# gpg: using RSA key F487EF185872D723
# gpg: Good signature from "Juan Quintela <quintela@redhat.com>"
# gpg: aka "Juan Quintela <quintela@trasno.org>"
# Primary key fingerprint: 1899 FF8E DEBF 58CC EE03 4B82 F487 EF18 5872 D723
* remotes/juanquintela/tags/check/20180822:
check: Only test tpm devices when they are compiled in
check: Only test usb-ehci when it is compiled in
check: Only test usb-uhci devices when they are compiled in
check: Only test usb-ohci when it is compiled in
check: Only test nvme when it is compiled in
check: Only test pvpanic when it is compiled in
check: Only test wdt_ib700 when it is compiled in
check: Only test sdhci when it is compiled in
check: Only test i82801b11 when it is compiled in
check: Only test ioh3420 when it is compiled in
check: Only test ipack when it is compiled in
check: Only test hda when it is compiled in
check: Only test ac97 when it is compiled in
check: Only test es1370 when it is compiled in
check: Only test rtl8139 when it is compiled in
check: Only test pcnet when it is compiled in
check: Only test eepro100 when it is compiled in
check: Only test ne2000 when it is compiled in
check: Only test vmxnet3 when it is compiled in
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Validate the config settings that the guest tries to set.
The wiki page documentation is not really accurate here:
generally rather than failing requests to set bad parameters,
the hardware will just clip them to something sensible.
Validate the most important parameters: sizes and
the viewport offsets. This prevents the framebuffer
code from trying to read out-of-range memory.
In the property handling code, we validate the new parameters every
time we encounter a tag that sets them. This means we validate the
config multiple times if the request includes multiple config-setting
tags, but the code would require significant restructuring to do a
validation only once but still return the clipped settings for
get-parameter tags and the buffer allocation tag.
Validation of settings made via the older bcm2835_fb_mbox_push()
function will be done in the next commit.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-8-peter.maydell@linaro.org
The raspi framebuffir in bcm2835_fb supports the definition
of a virtual "viewport", which is smaller than the full
physical framebuffer size and at an adjustable offset within
it. Only the viewport area is sent to the screen. This allows
the guest to do things like double buffering, or scrolling
by adjusting the viewport origin. Currently QEMU doesn't
implement this at all.
Add support for this feature:
* the property mailbox code needs to distinguish the
virtual width/height from the physical width/height
* the framebuffer code needs to do something with the
virtual width/height/origin information
Note that the wiki documentation on the semantics of the
virtual and physical height and width has it the wrong way
around -- the virtual size is the size of the allocated
buffer, and the physical size is the size of the display,
so the virtual size is always the same as or larger than
the physical.
If the viewport size is set smaller than the physical
screen size, we ignore the viewport settings completely
and just display the physical screen area.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-7-peter.maydell@linaro.org
Abstract out the calculation of the pitch and size of the
framebuffer into functions that operate on the BCM2835FBConfig
struct -- these are about to get a little more complicated
when we add support for virtual and physical sizes differing.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-6-peter.maydell@linaro.org
Refactor the fb property setting code so that rather than
using a set of pointers to local variables to track
whether a config value has been updated in the current
mbox and if so what its new value is, we just copy
all the current settings of the fb at the start, and
then update that copy as we go along, before asking
the fb to switch to it at the end.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-3-peter.maydell@linaro.org
The handling of framebuffer properties in the bcm2835_property code
is a bit clumsy, because for each of the many fb related properties
we try to track the value we're about to set and whether we're going
to be setting a value, and then we hand all the new values off
to the framebuffer via a function which takes them all as separate
arguments. It would be simpler if the property code could easily
copy all the framebuffer's current settings, update them with
the new specified values and then ask the framebuffer to switch
to the new set.
As the first part of this refactoring, pull all the fb config
settings fields in BCM2835FBState out into their own struct.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180814144436.679-2-peter.maydell@linaro.org
The IoTKit does not have any Master Security Contollers itself,
but it does provide registers in the secure privilege control
block which allow control of MSCs in the external system.
Add support for these registers.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180820141116.9118-13-peter.maydell@linaro.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Implement a model of the TrustZone Master Securtiy Controller,
as documented in the Arm CoreLink SIE-200 System IP for
Embedded TRM (DDI0571G):
https://developer.arm.com/products/architecture/m-profile/docs/ddi0571/g
The MSC is intended to sit in front of a device which can
be a bus master (eg a DMA controller) and programmably gate
its transactions. This allows a bus-mastering device to be
controlled by non-secure code but still restricted from
making accesses to addresses which are secure-only.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180820141116.9118-12-peter.maydell@linaro.org
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Implement the IoTKit system control element's system information
block; this is just a pair of read-only version/config registers,
plus the usual PID/CID ID registers.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180820141116.9118-10-peter.maydell@linaro.org
The Arm IoTKit includes a system control element which
provides a block of read-only ID registers and a block
of read-write control registers. Implement a minimal
version of this.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180820141116.9118-9-peter.maydell@linaro.org
In the MPS2 FPGAIO, PSCNTR is a free-running downcounter with
a reload value configured via the PRESCALE register, and
COUNTER counts up by 1 every time PSCNTR reaches zero.
Implement these counters.
We can just increment the counters migration subsection's
version ID because we only added it in the previous commit,
so no released QEMU versions will be using it.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180820141116.9118-3-peter.maydell@linaro.org
The MPS2 FPGAIO block includes some simple free-running counters.
Implement these.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180820141116.9118-2-peter.maydell@linaro.org
It was not possible to compile out pvpanic. Use the same trick
than applesmc.
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
The mmio_interface device was a purely internal artifact
of the implementation of the memory subsystem's request_ptr
APIs. Now that we have removed those APIs, we can remove
the mmio_interface device too.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: KONRAD Frederic <frederic.konrad@adacore.com>
Message-id: 20180817114619.22354-4-peter.maydell@linaro.org
This will be used to construct a memory region beyond the RAM region
to let firmwares scan the address space with load/store to guess how
much RAM the SoC has.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-7-joel@jms.id.au
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This is required to ensure u-boot SDRAM training completes.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-6-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The ast2500 SDRAM training routine busy waits on the 'init cycle busy
state' bit in DDR PHY Control/Status register #1 (MCR60).
This ensures the bit always reads zero, and allows training to
complete with upstream u-boot on the ast2500-evb.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-5-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The SDRAM training routine sets the 'Enable cache initial' bit, and then
waits for the 'cache initial sequence' to be done.
Have it always return done, as there is no other side effects that the
model needs to implement. This allows the upstream u-boot training to
proceed on the ast2500-evb board.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-4-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This fixes the intended protection of read-only values in the
configuration register. They were being always set to zero by mistake.
The read-only fields depend on the configured memory size of the system,
so they cannot be fixed at compile time. The most straight forward
option was to store them in the state structure.
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Message-id: 20180807075757.7242-3-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Valgrind reports an error when introspecting the macio devices, e.g.:
echo "{'execute':'qmp_capabilities'} {'execute':'device-list-properties'," \
"'arguments':{'typename':'macio-newworld'}}" \
"{'execute': 'human-monitor-command', " \
"'arguments': {'command-line': 'info qtree'}}" | \
valgrind -q ppc64-softmmu/qemu-system-ppc64 -M none,accel=qtest -qmp stdio
[...]
==30768== Invalid read of size 8
==30768== at 0x5BC1EA: qdev_print (qdev-monitor.c:686)
==30768== by 0x5BC1EA: qbus_print (qdev-monitor.c:719)
==30768== by 0x43E458: handle_hmp_command (monitor.c:3446)
[...]
Use the new function sysbus_init_child_obj() to initialize the objects
here, to get the reference counting of the objects right, so that they
are cleaned up correctly when the parent gets removed.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
In the tz-mpc device we allocate a data block for the LUT,
which we then clear to zero in the device's reset method.
This is conceptually fine, but unfortunately results in a
valgrind complaint about use of uninitialized data on startup:
==30906== Conditional jump or move depends on uninitialised value(s)
==30906== at 0x503609: tz_mpc_translate (tz-mpc.c:439)
==30906== by 0x3F3D90: address_space_translate_iommu (exec.c:511)
==30906== by 0x3F3FF8: flatview_do_translate (exec.c:584)
==30906== by 0x3F4292: flatview_translate (exec.c:644)
==30906== by 0x3F2120: address_space_translate (memory.h:1962)
==30906== by 0x3FB753: address_space_ldl_internal (memory_ldst.inc.c:36)
==30906== by 0x3FB8A6: address_space_ldl (memory_ldst.inc.c:80)
==30906== by 0x619037: ldl_phys (memory_ldst_phys.inc.h:25)
==30906== by 0x61985D: arm_cpu_reset (cpu.c:255)
==30906== by 0x98791B: cpu_reset (cpu.c:249)
==30906== by 0x57FFDB: armv7m_reset (armv7m.c:265)
==30906== by 0x7B1775: qemu_devices_reset (reset.c:69)
This is because of a reset ordering problem -- the TZ MPC
resets after the CPU, but an M-profile CPU's reset function
includes memory loads to get the initial PC and SP, which
then go through an MPC that hasn't yet been reset.
The simplest fix for this is to zero the LUT when we
initialize the data, which will result in the MPC's
translate function giving the right answers for these
early memory accesses.
Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-id: 20180724153616.32352-1-peter.maydell@linaro.org
aux_create_slave() calls qdev_init_nofail() which in turn "realizes"
the corresponding object. This is unlike qdev_create(), and it is wrong
because qdev_init_nofail() must not be called from an instance_init
function. Move qdev_init_nofail() and the subsequent aux_map_slave into
the caller's realize function.
There are two more bugs that needs to be fixed here, too, where the
objects are created but not added as children. Therefore when
you call object_unparent on them, nothing happens.
In particular dpcd and edid give you an infinite loop in bus_unparent,
because device_unparent is not called and does not remove them from
the list of devices on the bus.
Reported-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-id: 1531745974-17187-17-git-send-email-thuth@redhat.com
[thuth: Added Paolo's fixup for the dpcd and edid unparenting]
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The AST2500 SoC family changes the runtime behaviour of the hardware
strapping register (SCU70) to write-1-set/write-1-clear, with
write-1-clear implemented on the "read-only" SoC revision register
(SCU7C). For the the AST2400, the hardware strapping is
runtime-configured with read-modify-write semantics.
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Message-id: 20180709143524.17480-1-andrew@aj.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
In Hyper-V-related code, vCPUs are identified by their VP (virtual
processor) index. Since it's customary for "vcpu_id" in QEMU to mean
APIC id, rename the respective variables to "vp_index" to make the
distinction clear.
Signed-off-by: Roman Kagan <rkagan@virtuozzo.com>
Message-Id: <20180702134156.13404-2-rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Here's a last minue pull request before today's soft freeze. Ideally
I would have sent this earlier, but I was waiting for a couple of
extra fixes I knew were close. And the freeze crept up on me, like
always.
Most of the changes here are bugfixes in any case. There are some
cleanups as well, which have been in my staging tree for a little
while. There are a couple of truly new features (some extensions to
the sam460ex platform), but these are low risk, since they only affect
a new and not really stabilized machine type anyway.
Higlights are:
* Mac platform improvements from Mark Cave-Ayland
* Sam460ex improvements from BALATON Zoltan et al.
* XICS interrupt handler cleanups from Cédric Le Goater
* TCG improvements for atomic loads and stores from Richard
Henderson
* Assorted other bugfixes
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Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-3.0-20180703' into staging
ppc patch queue 2018-07-03
Here's a last minue pull request before today's soft freeze. Ideally
I would have sent this earlier, but I was waiting for a couple of
extra fixes I knew were close. And the freeze crept up on me, like
always.
Most of the changes here are bugfixes in any case. There are some
cleanups as well, which have been in my staging tree for a little
while. There are a couple of truly new features (some extensions to
the sam460ex platform), but these are low risk, since they only affect
a new and not really stabilized machine type anyway.
Higlights are:
* Mac platform improvements from Mark Cave-Ayland
* Sam460ex improvements from BALATON Zoltan et al.
* XICS interrupt handler cleanups from Cédric Le Goater
* TCG improvements for atomic loads and stores from Richard
Henderson
* Assorted other bugfixes
# gpg: Signature made Tue 03 Jul 2018 06:55:22 BST
# gpg: using RSA key 6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg: aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg: aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg: aka "David Gibson (kernel.org) <dwg@kernel.org>"
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E 87DC 6C38 CACA 20D9 B392
* remotes/dgibson/tags/ppc-for-3.0-20180703: (35 commits)
ppc: Include vga cirrus card into the compiling process
target/ppc: Relax reserved bitmask of indexed store instructions
target/ppc: set is_jmp on ppc_tr_breakpoint_check
spapr: compute default value of "hpt-max-page-size" later
target/ppc/kvm: don't pass cpu to kvm_get_smmu_info()
target/ppc/kvm: get rid of kvm_get_fallback_smmu_info()
ppc440_uc: Basic emulation of PPC440 DMA controller
sam460ex: Add RTC device
hw/timer: Add basic M41T80 emulation
ppc4xx_i2c: Rewrite to model hardware more closely
hw/ppc: Give sam46ex its own config option
fpu_helper.c: fix setting FPSCR[FI] bit
target/ppc: Implement the rest of gen_st_atomic
target/ppc: Implement the rest of gen_ld_atomic
target/ppc: Use atomic min/max helpers
target/ppc: Use MO_ALIGN for EXIWX and ECOWX
target/ppc: Split out gen_st_atomic
target/ppc: Split out gen_ld_atomic
target/ppc: Split out gen_load_locked
target/ppc: Tidy gen_conditional_store
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
# Conflicts:
# hw/ppc/spapr.c
This enables us to apply the same filter in DEBUG_DBDMA_CHANMASK to the
DBDMA command execution debug output.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
It eases code review, unit is explicit.
Patch generated using:
$ git grep -E '(1024|2048|4096|8192|(<<|>>).?(10|20|30))' hw/ include/hw/
and modified manually.
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180625124238.25339-16-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Unused, so let's remove it.
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180619134141.29478-8-david@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
All Aspeed SoC clocks are driven by an input source clock which can
have different frequencies : 24MHz or 25MHz, and also, on the Aspeed
AST2400 SoC, 48MHz. The H-PLL (CPU) clock is defined from a
calculation using parameters in the H-PLL Parameter register or from a
predefined set of frequencies if the setting is strapped by hardware
(Aspeed AST2400 SoC). The other clocks of the SoC are then defined
from the H-PLL using dividers.
We introduce first the APB clock because it should be used to drive
the Aspeed timer model.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Message-id: 20180622075700.5923-2-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Implement the SECMPCINTSTATUS register. This is the only register
in the security controller that deals with Memory Protection
Controllers, and it simply provides a read-only view of the
interrupt lines from the various MPCs in the system.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180620132032.28865-6-peter.maydell@linaro.org
The final part of the Memory Protection Controller we need to
implement is actually using the BLK_LUT data programmed by the
guest to determine whether to block the transaction or not.
Since this means we now change transaction mappings when
the guest writes to BLK_LUT, we must also call the IOMMU
notifiers at that point.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20180620132032.28865-5-peter.maydell@linaro.org
The MPC is guest-configurable for whether blocked accesses:
* should be RAZ/WI or cause a bus error
* should generate an interrupt or not
Implement this behaviour in the blocked-access handlers.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20180620132032.28865-4-peter.maydell@linaro.org
Implement the missing registers for the TZ MPC.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20180620132032.28865-3-peter.maydell@linaro.org
Implement the Arm TrustZone Memory Protection Controller, which sits
in front of RAM and allows secure software to configure it to either
pass through or reject transactions.
We implement the MPC as a QEMU IOMMU, which will direct transactions
either through to the devices and memory behind it or to a special
"never works" AddressSpace if they are blocked.
This initial commit implements the skeleton of the device:
* it always permits accesses
* it doesn't implement most of the registers
* it doesn't implement the interrupt or other behaviour
for blocked transactions
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Message-id: 20180620132032.28865-2-peter.maydell@linaro.org
In the case where we have an interrupt generated externally from inputs to
bits 1 and 2 of port A and/or port B, it is necessary to expose
mos6522_update_irq() so it can be called by the interrupt source.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The datasheet indicates that the interrupt is generated by ANDing the
interrupt flags register (IFR) with the interrupt enable register (IER)
but currently there is an extra filter for the SR and timer interrupts.
Remove this extra filter to allow interrupts to be generated by external
inputs on bits 1 and 2 of ports A and B.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
According to the 6522 datasheet the shift register (SR) interrupt flag is
cleared upon write with no mention of any other interrupt flags.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The PMU device supercedes the CUDA device found on older New World Macs and
is supported by a larger number of guest OSs from OS 9 to OS X 10.5.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The programmer switch is wired up via an external GPIO pin and can be used
to aid debugging Mac guests.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
PMU-enabled New World Macs expose their GPIOs via a separate memory region
within the macio device.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This option allows the VIA configuration to be controlled between 3
different possible setups: cuda, pmu-adb and pmu with USB rather than ADB
keyboard/mouse.
For the moment we don't do anything with the configuration except to pass
it to the macio device (the via-cuda parent) and also to the firmware via
the fw_cfg interface so that it can present the correct device tree.
The default is cuda which is the current default and so will have no
change in behaviour.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The ASPEED SoCs contain a single register that returns random data when
read. This models that register so that guests can use it.
The random number data register has a corresponding control register,
however it returns data regardless of the state of the enabled bit, so
the model follows this behaviour.
When the qcrypto call fails we exit as the guest uses the random number
device to feed it's entropy pool, which is used for cryptographic
purposes.
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Message-id: 20180613114836.9265-1-joel@jms.id.au
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The timers are configured in the mos6522 init function and therefore will
always exist, so the function can never return false.
Peter also pointed out that this is the only remaining user of
VMSTATE_TIMER_PTR_TEST in the codebase, so we might as well just convert it
over to VMSTATE_TIMER_PTR and remove mos6522_timer_exist() as it is no
longer required.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The 6522 VIA timer frequency cannot be set by altering registers within the
device itself and hence it is a fixed property of the machine.
Move the initialisation of the timer frequency to the mos6522 reset function
and ensure that any subclasses always call the parent reset function so that
it isn't required to store the timer frequency within vmstate_mos6522_timer
itself.
By moving the frequency initialisation to the device reset function then we
find that the realize function for both mos6522 and mos6522_cuda becomes
obsolete and can simply be removed.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Examining the migration stream it can be seen that the mos6522 device state is
being stored separately rather than as part of the CUDA device which is
incorrect (and likely to cause issues if another mos6522 device is added to
the machine).
Resolve this by embedding the mos6522_cuda device directly within the CUDA
device rather than using a QOM object link to reference the device separately.
Note that we also bump the version in vmstate_cuda to reflect this change: this
isn't particularly important for the moment as the Mac machine migration isn't
100% reliable due to issues migrating the timebase under TCG.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This was accidentally introduced when extracting the 6522 VIA functionality
from the CUDA device, and prevents loadvm from completing successfully.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Specs are available here :
https://www.nxp.com/docs/en/application-note/AN264.pdf
This is a simple model supporting the basic registers for led and GPIO
mode. The device also supports two blinking rates but not the model
yet.
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180530064049.27976-7-clg@kaod.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
I2CSlaveClass::init is no more used, remove it.
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180419212727.26095-3-f4bug@amsat.org>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20180528144509.15812-3-armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The SGA BIOS loader is an ISA device, it does not require the PCI header.
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180528232719.4721-18-f4bug@amsat.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marcel Apfelbaum<marcel.apfelbaum@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20180528232719.4721-17-f4bug@amsat.org>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The trace events all use a uint64_t data type, so should be using the
corresponding PRIx64 format, not HWADDR_PRIx which is intended for use
with the 'hwaddr' type.
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Since the macio device has a link to the PIC device, we can now wire up the
IRQs directly via qdev GPIOs rather than having to use an intermediate array.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Since the macio device has a link to the PIC device, we can now wire up the
IRQs directly via qdev GPIOs rather than having to use an intermediate array.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Change all the uses of serial_hds[] to go via the new
serial_hd() function. Code change produced with:
find hw -name '*.[ch]' | xargs sed -i -e 's/serial_hds\[\([^]]*\)\]/serial_hd(\1)/g'
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20180420145249.32435-8-peter.maydell@linaro.org
In icount mode, instructions that access io memory spaces in the middle
of the translation block invoke TB recompilation. After recompilation,
such instructions become last in the TB and are allowed to access io
memory spaces.
When the code includes instruction like i386 'xchg eax, 0xffffd080'
which accesses APIC, QEMU goes into an infinite loop of the recompilation.
This instruction includes two memory accesses - one read and one write.
After the first access, APIC calls cpu_report_tpr_access, which restores
the CPU state to get the current eip. But cpu_restore_state_from_tb
resets the cpu->can_do_io flag which makes the second memory access invalid.
Therefore the second memory access causes a recompilation of the block.
Then these operations repeat again and again.
This patch moves resetting cpu->can_do_io flag from
cpu_restore_state_from_tb to cpu_loop_exit* functions.
It also adds a parameter for cpu_restore_state which controls restoring
icount. There is no need to restore icount when we only query CPU state
without breaking the TB. Restoring it in such cases leads to the
incorrect flow of the virtual time.
In most cases new parameter is true (icount should be recalculated).
But there are two cases in i386 and openrisc when the CPU state is only
queried without the need to break the TB. This patch fixes both of
these cases.
Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <20180409091320.12504.35329.stgit@pasha-VirtualBox>
[rth: Make can_do_io setting unconditional; move from cpu_exec;
make cpu_loop_exit_{noexc,restore} call cpu_loop_exit.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
The macio-newworld device can currently be used to abort QEMU unexpectedly:
$ ppc-softmmu/qemu-system-ppc -S -M ref405ep,accel=qtest -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 50, "minor": 11, "major": 2},
"package": "build-all"}, "capabilities": []}}
{ 'execute': 'qmp_capabilities' }
{"return": {}}
{ 'execute': 'device-list-properties',
'arguments': {'typename': 'macio-newworld'}}
Unexpected error in qemu_chr_fe_init() at chardev/char-fe.c:222:
Device 'serial0' is in use
Aborted (core dumped)
qdev properties should be set during realize(), not during instance_init(),
so move the related code there to fix this problem.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The macio devices currently cause a crash when the user tries to
instantiate them on a different machine:
$ ppc64-softmmu/qemu-system-ppc64 -device macio-newworld
Unexpected error in qemu_chr_fe_init() at chardev/char-fe.c:222:
qemu-system-ppc64: -device macio-newworld: Device 'serial0' is in use
Aborted (core dumped)
These devices are clearly not intended to be creatable by the user
since they are using serial_hds[] directly in their instance_init
function. So let's mark them with user_creatable = false.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Use types that are defined by QEMU in trace events caused build failures
for the UST trace backend:
In file included from trace-ust-all.c:13:0:
trace-ust-all.h:11844:206: error: unknown type name ‘hwaddr’
It only knows about C built-in types, and any types that are pulled in
from includs of qemu-common.h and lttng/tracepoint.h. This does not
include the 'hwaddr' type, so replace it with a uint64_t which is what
exec/hwaddr.h defines 'hwaddr' as. This fixes the build failure
introduced by
commit 9eb8040c2d
Author: Peter Maydell <peter.maydell@linaro.org>
Date: Fri Mar 2 10:45:39 2018 +0000
hw/misc/tz-ppc: Model TrustZone peripheral protection controller
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180306134317.836-1-berrange@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Move the remaining comment into macio.c for reference, then remove the
macio_init() function and instantiate the macio devices for both Old World
and New World machines via qdev_init_nofail() directly.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This removes the last of the functionality from macio_init() in preparation
for its subsequent removal.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Also switch macio_newworld_realize() over to use it rather than using the pic_mem
memory region directly.
Now that both Old World and New World macio devices no longer make use of the
pic_mem memory region directly, we can remove it.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Also switch macio_oldworld_realize() over to use it rather than using the pic_mem
memory region directly.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Now that the ESCC device is instantiated directly via qdev, move it to within
the macio device and wire up the IRQs and memory regions using the sysbus API.
This enables to remove the now-obsolete escc_mem parameter to the macio_init()
function.
(Note this patch also contains small touch-ups to the formatting in
macio_escc_legacy_setup() and ppc_heathrow_init() in order to keep checkpatch
happy)
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The current recommendation is to embed subdevices directly within their container
device, so do this for the DBDMA device.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Add remaining easy registers to iotkit-secctl:
* NSCCFG just routes its two bits out to external GPIO lines
* BRGINSTAT/BRGINTCLR/BRGINTEN can be dummies, because QEMU's
bus fabric can never report errors
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20180220180325.29818-18-peter.maydell@linaro.org
The IoTKit Security Controller includes various registers
that expose to software the controls for the Peripheral
Protection Controllers in the system. Implement these.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-17-peter.maydell@linaro.org
The Arm IoT Kit includes a "security controller" which is largely a
collection of registers for controlling the PPCs and other bits of
glue in the system. This commit provides the initial skeleton of the
device, implementing just the ID registers, and a couple of read-only
read-as-zero registers.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-16-peter.maydell@linaro.org
Add a model of the TrustZone peripheral protection controller (PPC),
which is used to gate transactions to non-TZ-aware peripherals so
that secure software can configure them to not be accessible to
non-secure software.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-15-peter.maydell@linaro.org
The MPS2 AN505 FPGA image includes a "FPGA control block"
which is a small set of registers handling LEDs, buttons
and some counters.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-14-peter.maydell@linaro.org
Move the definition of the struct for the unimplemented-device
from unimp.c to unimp.h, so that users can embed the struct
in their own device structs if they prefer.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20180220180325.29818-10-peter.maydell@linaro.org
Some register blocks of the ast2500 are protected by protection key
registers which require the right magic value to be written to those
registers to allow those registers to be mutated.
Register manuals indicate that writing the correct magic value to these
registers should cause subsequent reads from those values to return 1,
and writing any other value should cause subsequent reads to return 0.
Previously, qemu implemented these registers incorrectly: the registers
were handled as simple memory, meaning that writing some value x to a
protection key register would result in subsequent reads from that
register returning the same value x. The protection was implemented by
ensuring that the current value of that register equaled the magic
value.
This modifies qemu to have the correct behaviour: attempts to write to a
ast2500 protection register results in a transition to 1 or 0 depending
on whether the written value is the correct magic. The protection logic
is updated to ensure that the value of the register is nonzero.
This bug caused deadlocks with u-boot HEAD: when u-boot is done with a
protectable register block, it attempts to lock it by writing the
bitwise inverse of the correct magic value, and then spinning forever
until the register reads as zero. Since qemu implemented writes to these
registers as ordinary memory writes, writing the inverse of the magic
value resulted in subsequent reads returning that value, leading to
u-boot spinning forever.
Signed-off-by: Hugo Landau <hlandau@devever.net>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Acked-by: Andrew Jeffery <andrew@aj.id.au>
Message-id: 20180220132627.4163-1-hlandau@devever.net
[PMM: fixed incorrect code indentation]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Add the relevant hooks as required for the MacOS timer calibration and delayed
SR interrupt.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The MOS6522 VIA forms the bridge part of several Mac devices, including the
Mac via-cuda and via-pmu devices. Introduce a standard mos6522 device that
can be shared amongst multiple implementations.
This is effectively taking the 6522 parts out of cuda.c and turning them
into a separate device whilst also applying some style tidy-ups and including
a conversion to trace-events.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Commit b981289c49 "PPC: Cuda: Use cuda timer to expose tbfreq to guest" altered
the timer calculations from those based upon the hardware CUDA clock frequency
to those based upon the CPU timebase frequency.
In fact we can isolate the differences to 2 simple changes: one to the counter
read value and another to the counter load time. Move these changes into
separate functions so the implementation can be swapped later.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Now that we have successfully decoupled the timebase frequency and the hardware
timer frequency, set the timer 1 frequency property to CUDA_TIMER_FREQ and alter
get_next_irq_time() to use it rather than the hard-coded constant.
In addition to this we must now switch the tb_diff calculation over to use the
timebase frequency now that the hardware clock frequency and the timebase
frequency are different.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
[dwg: Correct a conflict due to a bug in an earlier patch]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The wire protocol for reading data to/from the VIA is triggered by changing
inputs on port B rather than changing the timer configuration via the ACR.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This allows us to more easily differentiate between the timebase frequency used
to calibrate the MacOS timers and the actual frequency of the hardware clock as
indicated by CUDA_TIMER_FREQ.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
[dwg: Revert some extraneous changes which break compile]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This will be required shortly and also happens to match nicely with the
corresponding signature for set_counter().
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Use the direction registers as a mask to ensure that only input pins are
updated upon write.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Merge remote-tracking branch 'remotes/armbru/tags/pull-misc-2018-02-07-v4' into staging
Miscellaneous patches for 2018-02-07
# gpg: Signature made Fri 09 Feb 2018 12:52:51 GMT
# gpg: using RSA key 3870B400EB918653
# gpg: Good signature from "Markus Armbruster <armbru@redhat.com>"
# gpg: aka "Markus Armbruster <armbru@pond.sub.org>"
# Primary key fingerprint: 354B C8B3 D7EB 2A6B 6867 4E5F 3870 B400 EB91 8653
* remotes/armbru/tags/pull-misc-2018-02-07-v4:
Move include qemu/option.h from qemu-common.h to actual users
Drop superfluous includes of qapi/qmp/qjson.h
Drop superfluous includes of qapi/qmp/dispatch.h
Include qapi/qmp/qnull.h exactly where needed
Include qapi/qmp/qnum.h exactly where needed
Include qapi/qmp/qbool.h exactly where needed
Include qapi/qmp/qstring.h exactly where needed
Include qapi/qmp/qdict.h exactly where needed
Include qapi/qmp/qlist.h exactly where needed
Include qapi/qmp/qobject.h exactly where needed
qdict qlist: Make most helper macros functions
Eliminate qapi/qmp/types.h
Typedef the subtypes of QObject in qemu/typedefs.h, too
Include qmp-commands.h exactly where needed
Drop superfluous includes of qapi/qmp/qerror.h
Include qapi/error.h exactly where needed
Drop superfluous includes of qapi-types.h and test-qapi-types.h
Clean up includes
Use #include "..." for our own headers, <...> for others
vnc: use stubs for CONFIG_VNC=n dummy functions
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
