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Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the Ma
From: |
Laurent Vivier |
Subject: |
Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM |
Date: |
Tue, 5 Oct 2021 17:08:46 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 |
Le 05/10/2021 à 13:38, Mark Cave-Ayland a écrit :
> On 05/10/2021 10:50, Laurent Vivier wrote:
>
>> Le 04/10/2021 à 23:19, Mark Cave-Ayland a écrit :
>>> The monitor modes table is found by experimenting with the Monitors Control
>>> Panel in MacOS and analysing the reads/writes. From this it can be found
>>> that
>>> the mode is controlled by writes to the DAFB_MODE_CTRL1 and DAFB_MODE_CTRL2
>>> registers.
>>>
>>> Implement the first block of DAFB registers as a register array including
>>> the
>>> existing sense register, the newly discovered control registers above, and
>>> also
>>> the DAFB_MODE_VADDR1 and DAFB_MODE_VADDR2 registers which are used by
>>> NetBSD to
>>> determine the current video mode.
>>>
>>> These experiments also show that the offset of the start of video RAM and
>>> the
>>> stride can change depending upon the monitor mode, so update
>>> macfb_draw_graphic()
>>> and both the BI_MAC_VADDR and BI_MAC_VROW bootinfo for the q800 machine
>>> accordingly.
>>>
>>> Finally update macfb_common_realize() so that only the resolution and depth
>>> supported by the display type can be specified on the command line.
>>>
>>> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
>>> Reviewed-by: Laurent Vivier <laurent@vivier.eu>
>>> ---
>>> hw/display/macfb.c | 124 ++++++++++++++++++++++++++++++++-----
>>> hw/display/trace-events | 1 +
>>> hw/m68k/q800.c | 11 ++--
>>> include/hw/display/macfb.h | 16 ++++-
>>> 4 files changed, 131 insertions(+), 21 deletions(-)
>>>
>>> diff --git a/hw/display/macfb.c b/hw/display/macfb.c
>>> index f98bcdec2d..357fe18be5 100644
>>> --- a/hw/display/macfb.c
>>> +++ b/hw/display/macfb.c
>>>
>> ...
>>> +static MacFbMode *macfb_find_mode(MacfbDisplayType display_type,
>>> + uint16_t width, uint16_t height,
>>> + uint8_t depth)
>>> +{
>>> + MacFbMode *macfb_mode;
>>> + int i;
>>> +
>>> + for (i = 0; i < ARRAY_SIZE(macfb_mode_table); i++) {
>>> + macfb_mode = &macfb_mode_table[i];
>>> +
>>> + if (display_type == macfb_mode->type && width == macfb_mode->width
>>> &&
>>> + height == macfb_mode->height && depth ==
>>> macfb_mode->depth) {
>>> + return macfb_mode;
>>> + }
>>> + }
>>> +
>>> + return NULL;
>>> +}
>>> +
>>
>> I misunderstood this part when I reviewed v1...
>>
>> It means you have to provide the monitor type to QEMU to switch from the
>> default mode?
>
> Not as such: both the MacOS toolbox ROM and MacOS itself offer a fixed set of
> resolutions and depths
> based upon the display type. What I've done for now is default the display
> type to VGA since it
> offers both 640x480 and 800x600 in 1, 2, 4, 8, 16 and 24-bit colour which
> should cover the most
> common use of cases of people wanting to boot using the MacOS toolbox ROM.
>
> Even if you specify a default on the command line, MacOS still only cares
> about the display type and
> will allow you to change the resolution and depth dynamically, remembering
> the last resolution and
> depth across reboots.
>
> During testing I found that having access to the 1152x870 resolution offered
> by the Apple 21"
> monitor display type was useful to allow larger screen sizes, although only
> up to 8-bit depth so I
> added a bit of code that will switch from a VGA display type to a 21" display
> type if the graphics
> resolution is set to 1152x870x8.
>
> Finally if you boot a Linux kernel directly using -kernel then the provided
> XxYxD is placed directly
> into the relevant bootinfo fields with a VGA display type, unless a
> resolution of 1152x870x8 is
> specified in which case the 21" display type is used as above.
>
>> But, as a user, how do we know which modes are allowed with which resolution?
>>
>> Is possible to try to set internally the type here according to the
>> resolution?
>>
>> Could you provide an command line example how to start the q800 with the
>> 1152x870 resolution?
>
> Sure - simply add "-g 1152x870x8" to your command line. If the -g parameter
> is omitted then the
> display type will default to VGA.
>
Thank you for the explanation.
Perhaps you can add in the error message the list of the available mode and
depth?
(it's not a blocker for the series, it can be added later)
As an user, it's hard to know what are the allowed values.
Thanks,
Laurent
- [PATCH v2 03/12] macfb: fix overflow of color_palette array, (continued)
- [PATCH v2 03/12] macfb: fix overflow of color_palette array, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 04/12] macfb: use memory_region_init_ram() in macfb_common_realize() for the framebuffer, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 05/12] macfb: add trace events for reading and writing the control registers, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 06/12] macfb: implement mode sense to allow display type to be detected, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 07/12] macfb: add qdev property to specify display type, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 10/12] macfb: fix 24-bit RGB pixel encoding, Mark Cave-Ayland, 2021/10/04
- [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/04
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Laurent Vivier, 2021/10/05
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/05
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM,
Laurent Vivier <=
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/05
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Laurent Vivier, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Laurent Vivier, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Laurent Vivier, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Laurent Vivier, 2021/10/06
- Re: [PATCH v2 08/12] macfb: add common monitor modes supported by the MacOS toolbox ROM, Mark Cave-Ayland, 2021/10/07
[PATCH v2 09/12] macfb: fix up 1-bit pixel encoding, Mark Cave-Ayland, 2021/10/04
[PATCH v2 11/12] macfb: add vertical blank interrupt, Mark Cave-Ayland, 2021/10/04