xemu-project/xemu
1
0
Fork 0
mirror of https://github.com/xemu-project/xemu.git synced 2025-02-08 21:28:13 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
xemu/hw/timer
History
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
..
a9gtimer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
allwinner-a10-pit.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
altera_timer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
arm_mptimer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
arm_timer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
armv7m_systick.c
hw/timer/armv7m_systick: Rewrite to use ptimers
2020-10-27 11:15:31 +00:00
aspeed_timer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
avr_timer16.c
hw/timer: avr: Add limited support for 16-bit timer peripheral
2020-07-11 11:02:05 +02:00
bcm2835_systmr.c
hw/timer/bcm2835: Support the timer COMPARE registers
2020-10-20 16:12:00 +01:00
cadence_ttc.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
cmsdk-apb-dualtimer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
cmsdk-apb-timer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
digic-timer.c
hw/timer/digic-timer.c: Switch to transaction-based ptimer API
2019-10-15 18:09:02 +01:00
etraxfs_timer.c
Use DECLARE_*CHECKER* macros
2020-09-09 09:27:09 -04:00
exynos4210_mct.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
exynos4210_pwm.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
grlib_gptimer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
hpet.c
Pull request trivial patches 20200919
2020-09-22 15:42:23 +01:00
i8254_common.c
hw/i386: Remove obsolete LoadStateHandler::load_state_old handlers
2019-11-05 23:33:12 +01:00
i8254.c
Use DECLARE_*CHECKER* macros
2020-09-09 09:27:09 -04:00
imx_epit.c
hw/timer/imx_epit: Avoid assertion when CR.SWR is written
2020-08-03 17:56:11 +01:00
imx_gpt.c
hw/timer/imx_gpt.c: Switch to transaction-based ptimer API
2019-10-15 18:09:03 +01:00
Kconfig
hw/timer: avr: Add limited support for 16-bit timer peripheral
2020-07-11 11:02:05 +02:00
lm32_timer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
meson.build
hw/timer: Add NPCM7xx Timer device model
2020-09-14 14:24:58 +01:00
milkymist-sysctl.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
mips_gictimer.c
Include hw/hw.h exactly where needed
2019-08-16 13:31:52 +02:00
mss-timer.c
qdev: set properties with device_class_set_props()
2020-01-24 20:59:15 +01:00
npcm7xx_timer.c
hw/timer: Adding watchdog for NPCM7XX Timer.
2020-10-27 11:10:01 +00:00
nrf51_timer.c
hw/timer/nrf51_timer: Add trace event of counter value update
2020-05-11 11:05:52 +01:00
omap_gptimer.c
Include hw/hw.h exactly where needed
2019-08-16 13:31:52 +02:00
omap_synctimer.c
Include hw/hw.h exactly where needed
2019-08-16 13:31:52 +02:00
puv3_ost.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
pxa2xx_timer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
renesas_cmt.c
hw/timer: RX62N compare match timer (CMT)
2020-06-22 18:37:12 +02:00
renesas_tmr.c
hw/timer: RX62N 8-Bit timer (TMR)
2020-06-22 18:37:12 +02:00
sh_timer.c
hw/timer/sh_timer: Remove unused 'qemu/timer.h' include
2020-06-22 18:37:12 +02:00
slavio_timer.c
Use OBJECT_DECLARE_SIMPLE_TYPE when possible
2020-09-18 14:12:32 -04:00
stm32f2xx_timer.c
hw/timer/stm32f2xx_timer: Remove dead assignment
2020-05-04 14:43:24 +02:00
trace-events
hw/timer/bcm2835: Support the timer COMPARE registers
2020-10-20 16:12:00 +01:00
trace.h
trace: switch position of headers to what Meson requires
2020-08-21 06:18:24 -04:00
xilinx_timer.c
Use DECLARE_*CHECKER* macros
2020-09-09 09:27:09 -04:00