OpenE2K/qemu-e2k
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32bd322a01
qemu-e2k/include/hw
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Peter Maydell 32bd322a01 hw/timer/armv7m_systick: Rewrite to use ptimers 
The armv7m systick timer is a 24-bit decrementing, wrap-on-zero,
clear-on-write counter. Our current implementation has various
bugs and dubious workarounds in it (for instance see
https://bugs.launchpad.net/qemu/+bug/1872237).

We have an implementation of a simple decrementing counter
and we put a lot of effort into making sure it handles the
interesting corner cases (like "spend a cycle at 0 before
reloading") -- ptimer.

Rewrite the systick timer to use a ptimer rather than
a raw QEMU timer.

Unfortunately this is a migration compatibility break,
which will affect all M-profile boards.

Among other bugs, this fixes
https://bugs.launchpad.net/qemu/+bug/1872237 :
now writes to SYST_CVR when the timer is enabled correctly
do nothing; when the timer is enabled via SYST_CSR.ENABLE,
the ptimer code will (because of POLICY_NO_IMMEDIATE_RELOAD)
arrange that after one timer tick the counter is reloaded
from SYST_RVR and then counts down from there, as the
architecture requires.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20201015151829.14656-3-peter.maydell@linaro.org
2020-10-27 11:15:31 +00:00
..
acpi qom: fix objects with improper parent type 2020-10-12 11:50:22 -04:00
adc Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
arm hw/arm/raspi: add a skeleton implementation of the CPRMAN 2020-10-27 11:10:44 +00:00
audio
block Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
char hw/char/pl011: add a clock input 2020-10-27 11:10:44 +00:00
core cpu: Introduce CPU model deprecation API 2020-10-14 15:28:54 -04:00
cpu Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
cris
display edid: use physical dimensions if available 2020-09-29 10:08:25 +02:00
dma Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
firmware
gpio hw/gpio: Add GPIO model for Nuvoton NPCM7xx 2020-10-27 11:10:32 +00:00
hyperv Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
i2c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
i386 microvm: add usb support 2020-10-21 11:36:19 +02:00
ide ide: remove magic constants from the device register 2020-10-01 13:04:16 -04:00
input input: tsc2xxx fix. 2020-09-22 21:11:10 +01:00
intc hw/intc: Move sifive_plic.h to the include directory 2020-10-22 12:00:22 -07:00
ipack Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ipmi Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
isa Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
kvm target/i386: always create kvmclock device 2020-09-30 19:11:36 +02:00
lm32
m68k Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
mem qapi: Restrict device memory commands to machine code 2020-09-29 15:41:36 +02:00
mips hw/mips: Simplify code using ROUND_UP(INITRD_PAGE_SIZE) 2020-10-17 13:59:40 +02:00
misc hw/misc/bcm2835_cprman: add sane reset values to the registers 2020-10-27 11:10:44 +00:00
net Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
nubus Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
nvram Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pci Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pci-bridge Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
pci-host uninorth: use qdev gpios for PCI IRQs 2020-10-18 16:21:42 +01:00
ppc spapr: add spapr_machine_using_legacy_numa() helper 2020-10-09 10:52:09 +11:00
rdma Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
riscv hw/riscv: Load the kernel after the firmware 2020-10-22 12:00:22 -07:00
rtc m48t59: remove legacy m48t59_init() function 2020-10-18 16:21:42 +01:00
rx Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
s390x s390: guest support for diagnose 0x318 2020-10-02 13:52:49 +02:00
scsi scsi/scsi_bus: Add scsi_device_get 2020-10-12 11:50:51 -04:00
sd Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
semihosting
sh4
southbridge Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
sparc Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ssi Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
timer hw/timer/armv7m_systick: Rewrite to use ptimers 2020-10-27 11:15:31 +00:00
tricore
unicore32
usb usb/xhci: add xhci_sysbus_build_aml() helper 2020-10-21 11:36:19 +02:00
vfio Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
virtio vhost-scsi: support inflight io track 2020-09-30 19:09:20 +02:00
watchdog hw/watchdog: Implement SBSA watchdog device 2020-10-27 11:10:44 +00:00
xen xen-bus: reduce scope of backend watch 2020-10-19 16:32:41 +01:00
xtensa
boards.h machine: remove deprecated -machine enforce-config-section option 2020-10-26 07:08:39 -04:00
clock.h hw/core/clock: provide the VMSTATE_ARRAY_CLOCK macro 2020-10-27 11:10:44 +00:00
elf_ops.h
fw-path-provider.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
hotplug.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
hw.h
ide.h
irq.h
loader-fit.h
loader.h
nmi.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
or-irq.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
pcmcia.h Use OBJECT_DECLARE_TYPE when possible 2020-09-18 14:12:32 -04:00
platform-bus.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ptimer.h
qdev-clock.h
qdev-core.h device-core: use atomic_set on .realized property 2020-10-12 11:50:51 -04:00
qdev-dma.h
qdev-properties.h hw/core/qdev-properties: Export qdev_prop_enum 2020-10-06 11:09:35 -04:00
register.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
registerfields.h
resettable.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
stream.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00
sysbus.h qom: Remove module_obj_name parameter from OBJECT_DECLARE* macros 2020-09-18 14:12:32 -04:00
usb.h Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
vmstate-if.h Use DECLARE_*CHECKER* macros 2020-09-09 09:27:09 -04:00