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Mark Cave-Ayland 30ca7eddc4 mac_via: remove VIA1 timer optimisations 
The original implementation of the Macintosh VIA devices in commit 6dca62a000
"hw/m68k: add VIA support" used timer optimisations to reduce high CPU usage on
the host when booting Linux. These optimisations worked by waiting until VIA1
port B was accessed before re-arming the timers.

The MacOS toolbox ROM constantly writes to VIA1 port B which calls
via1_one_second_update() and via1_sixty_hz_update() to calculate the new expiry
time, causing the timers to constantly reset and never fire. The effect of this
is that the Ticks (0x16a) global variable holding the number of 60Hz timer ticks
since reset is never incremented by the interrupt causing time to stand still.

Whilst the code was introduced as a performance optimisation, it is likely that
the high CPU usage was actually caused by the incorrect 60Hz timer interval
fixed in the previous patch. Remove the optimisation to keep everything simple
and enable the MacOS toolbox ROM to start keeping time.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20210311100505.22596-8-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
 		2021-03-16 21:41:37 +01:00
..
9pfs qtest: delete superfluous inclusions of qtest.h 2021-03-09 06:03:53 +01:00
acpi acpi/core: always set SCI_EN when SMM isn't supported 2021-02-23 10:58:42 -05:00
adc clock: Add ClockEvent parameter to callbacks 2021-03-08 17:20:01 +00:00
alpha vl: extract softmmu/datadir.c 2020-12-10 12:15:18 -05:00
arm hw/arm: Connect PWM fans in NPCM7XX boards 2021-03-12 12:50:36 +00:00
audio audio/via-ac97: Simplify code and set user_creatable to false 2021-01-04 23:24:44 +01:00
avr hw/avr/arduino: List board schematic links 2021-03-15 00:39:52 +01:00
block virtio-blk: Respect discard granularity 2021-03-15 09:48:53 +00:00
char Pull request 2021-03-11 18:55:27 +00:00
core -----BEGIN PGP SIGNATURE----- 2021-03-16 10:53:47 +00:00
cpu cpu/core: Register core-id and nr-threads as class properties 2020-09-22 16:48:29 -04:00
cris cris: do not use ram_size global 2020-12-10 12:15:07 -05:00
display target-arm queue: 2021-03-14 13:18:49 +00:00
dma target-arm queue: 2021-03-10 13:57:31 +00:00
gpio hw: gpio: implement gpio-pwr driver for qemu reset/poweroff 2021-01-29 10:47:28 +00:00
hppa hw: Use the PCI_SLOT() macro from 'hw/pci/pci.h' 2021-01-04 23:24:44 +01:00
hyperv qdev: Move softmmu properties to qdev-properties-system.h 2020-12-18 15:20:17 -05:00
i2c hw/i2c/npcm7xx_smbus: Simplify npcm7xx_smbus_init() 2021-03-05 15:17:34 +00:00
i386 dma: Introduce dma_aligned_pow2_mask() 2021-03-12 12:40:10 +00:00
ide sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
input Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
intc sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
ipack Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
ipmi Remove superfluous timer_del() calls 2021-01-08 15:13:38 +00:00
isa acpi/core: always set SCI_EN when SMM isn't supported 2021-02-23 10:58:42 -05:00
lm32 hw/lm32/Kconfig: Have MILKYMIST select LM32_DEVICES 2021-03-09 22:37:08 +01:00
m68k esp: rename existing ESP QOM type to SYSBUS_ESP 2021-03-07 10:39:05 +00:00
mem nvdimm: put it into the 'storage' category 2021-02-20 12:36:19 +01:00
microblaze vl: make qemu_get_machine_opts static 2020-12-15 12:51:55 -05:00
mips hw/mips/gt64xxx: Trace accesses to ISD registers 2021-03-13 20:29:36 +01:00
misc mac_via: remove VIA1 timer optimisations 2021-03-16 21:41:37 +01:00
moxie moxie: do not use ram_size global 2020-12-10 12:15:08 -05:00
net net: Move NetClientState.info_str to dynamic allocations 2021-03-15 16:41:22 +08:00
nios2 * New -action option and set-action QMP command (Alejandro) 2020-12-15 21:24:31 +00:00
nubus meson: convert hw/nubus 2020-08-21 06:30:25 -04:00
nvram sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
openrisc target/openrisc: Move pic_cpu code into CPU object proper 2020-12-15 12:04:30 +00:00
pci hw/pci: Have safer pcie_bus_realize() by checking error path 2021-03-02 09:16:18 -05:00
pci-bridge Kconfig: Compile PXB for ARM_VIRT 2021-01-17 06:42:54 -05:00
pci-host hw/pci-host: Introduce SH_PCI Kconfig entry 2021-03-06 16:18:42 +01:00
pcmcia pxa2xx: Move QOM macros to header 2020-08-27 14:04:55 -04:00
ppc ppc patch queue for 2021-03-10 2021-03-12 11:30:55 +00:00
rdma pvrdma: wean code off pvrdma_ring.h kernel header 2021-03-15 16:41:22 +08:00
remote multi-process: perform device reset in the remote process 2021-02-10 09:23:28 +00:00
riscv Testing, guest-loader and other misc tweaks 2021-03-11 16:20:58 +00:00
rtc goldfish_rtc: re-arm the alarm after migration 2021-03-04 09:43:29 -05:00
rx qtest: delete superfluous inclusions of qtest.h 2021-03-09 06:03:53 +01:00
s390x sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
scsi sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
sd Pull request trivial patches 20210220 2021-02-21 12:12:18 +00:00
sh4 hw/sh4/sh7750_regs: Replace link to license by its full content 2021-03-06 16:19:03 +01:00
smbios i386: do not use ram_size global 2020-12-10 12:15:08 -05:00
sparc esp: rename existing ESP QOM type to SYSBUS_ESP 2021-03-07 10:39:05 +00:00
sparc64 vl: extract softmmu/datadir.c 2020-12-10 12:15:18 -05:00
ssi hw/ssi: xilinx_spips: Remove DMA related dead codes from zynqmp_spips 2021-03-10 13:54:51 +00:00
timer hw/timer/sse-timer: Propagate eventual error in sse_timer_realize() 2021-03-12 12:43:52 +00:00
tpm tpm: put some tpm devices into the correct category 2021-02-20 12:36:19 +01:00
tricore tricore: added triboard with tc27x_soc 2021-03-14 14:41:55 +01:00
unicore32 meson: convert hw/arch* 2020-08-21 06:30:33 -04:00
usb sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
vfio sysemu: Let VMChangeStateHandler take boolean 'running' argument 2021-03-09 23:13:57 +01:00
virtio virtio-net: calculating proper msix vectors on init 2021-03-15 16:41:22 +08:00
watchdog clock: Add ClockEvent parameter to callbacks 2021-03-08 17:20:01 +00:00
xen pci: add romsize property 2021-02-05 08:52:58 -05:00
xenpv meson: convert hw/arch* 2020-08-21 06:30:33 -04:00
xtensa vl: make qemu_get_machine_opts static 2020-12-15 12:51:55 -05:00
Kconfig semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00
meson.build semihosting: Move hw/semihosting/ -> semihosting/ 2021-03-10 15:34:12 +00:00