diff options
| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2023-10-04 09:38:00 +0100 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2023-10-06 10:33:43 +0200 |
| commit | 366d27796ca1d09d6b6a6ad69a89cb7644d92930 (patch) | |
| tree | 46ea26b3950d1e1cd407e889a247f4cc63a71111 /hw/misc/trace-events | |
| parent | 994af0b2e020a91729a39f8c4af4a522ccd3a556 (diff) | |
| download | focaccia-qemu-366d27796ca1d09d6b6a6ad69a89cb7644d92930.tar.gz focaccia-qemu-366d27796ca1d09d6b6a6ad69a89cb7644d92930.zip | |
mac_via: work around underflow in TimeDBRA timing loop in SETUPTIMEK
The MacOS toolbox ROM calculates the number of branches that can be executed per millisecond as part of its timer calibration. Since modern hosts are considerably quicker than original hardware, the negative counter reaches zero before the calibration completes leading to division by zero later in CALCULATESLOD. Instead of trying to fudge the timing loop (which won't work for TimeDBRA/TimeSCCDB anyhow), use the pattern of access to the VIA1 registers to detect when SETUPTIMEK has finished executing and write some well-known good timer values to TimeDBRA and TimeSCCDB taken from real hardware with a suitable scaling factor. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-ID: <20231004083806.757242-15-mark.cave-ayland@ilande.co.uk> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'hw/misc/trace-events')
| -rw-r--r-- | hw/misc/trace-events | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/hw/misc/trace-events b/hw/misc/trace-events index 29bc531d4d..5a998f5e4e 100644 --- a/hw/misc/trace-events +++ b/hw/misc/trace-events @@ -272,6 +272,7 @@ via1_adb_send(const char *state, uint8_t data, const char *vadbint) "state %s da via1_adb_receive(const char *state, uint8_t data, const char *vadbint, int status, int index, int size) "state %s data=0x%02x vADBInt=%s status=0x%x index=%d size=%d" via1_adb_poll(uint8_t data, const char *vadbint, int status, int index, int size) "data=0x%02x vADBInt=%s status=0x%x index=%d size=%d" via1_auxmode(int mode) "setting auxmode to %d" +via1_timer_hack_state(int state) "setting timer_hack_state to %d" # grlib_ahb_apb_pnp.c grlib_ahb_pnp_read(uint64_t addr, unsigned size, uint32_t value) "AHB PnP read addr:0x%03"PRIx64" size:%u data:0x%08x" |