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From: Michael <macallan1888@gmail.com>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: "Michael Lorenz" <macallan@NetBSD.org>,
	1892540@bugs.launchpad.net, "Andreas Gustafsson" <gson@gson.org>,
	"Mark Cave-Ayland" <mark.cave-ayland@ilande.co.uk>,
	"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
	qemu-devel@nongnu.org, "Gerd Hoffmann" <kraxel@redhat.com>,
	"Laurent Vivier" <laurent@vivier.eu>
Subject: Re: [RFC PATCH v2] hw/display/tcx: Allow 64-bit accesses to framebuffer stippler and blitter
Date: Sat, 29 Aug 2020 12:13:41 -0400	[thread overview]
Message-ID: <20200829121341.59d8277b@glenfarclas> (raw)
In-Reply-To: <7300edf2-ab44-3676-6948-adf2c5af6c02@linaro.org>

Hello,

since I wrote the NetBSD code in question, here are my 2 cent:

On Sat, 29 Aug 2020 08:41:43 -0700
Richard Henderson <richard.henderson@linaro.org> wrote:

> On 8/22/20 7:21 AM, Philippe Mathieu-Daudé wrote:
> > The S24/TCX datasheet is listed as "Unable to locate" on [1].

I don't have it either, but someone did a lot of reverse engineering
and gave me his notes. The hardware isn't that complicated, but quite
weird.

> > However the NetBSD revision 1.32 of the driver introduced
> > 64-bit accesses to the stippler and blitter [2]. It is safe
> > to assume these memory regions are 64-bit accessible.
> > QEMU implementation is 32-bit, so fill the 'impl' fields.

IIRC the real hardware *requires* 64bit accesses for stipple and
blitter operations to work. For stipples you write a 64bit word into
STIP space, the address defines where in the framebuffer you want to
draw, the data contain a 32bit bitmask, foreground colour and a ROP.
BLIT space works similarly, the 64bit word contains an offset were to
read pixels from, and how many you want to copy.

have fun
Michael


  reply	other threads:[~2020-08-29 17:21 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-21 19:15 [Bug 1892540] [NEW] qemu can no longer boot NetBSD/sparc Andreas Gustafsson
2020-08-22 10:50 ` [Bug 1892540] " Laurent Vivier
2020-08-22 14:21 ` [RFC PATCH v2] hw/display/tcx: Allow 64-bit accesses to framebuffer stippler and blitter Philippe Mathieu-Daudé
2020-08-22 14:21   ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-08-29 15:41   ` Richard Henderson
2020-08-29 16:13     ` Michael [this message]
2020-08-29 16:45       ` Philippe Mathieu-Daudé
2020-08-29 16:45         ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-08-29 21:04         ` Michael
2020-08-30  7:32         ` Mark Cave-Ayland
2020-08-30  7:32           ` [Bug 1892540] " Mark Cave-Ayland
2020-10-24 20:53           ` Philippe Mathieu-Daudé
2020-10-24 20:53             ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-08-30  6:18   ` [Bug 1892540] " mst
2020-08-30  6:18     ` mst
2020-08-30  6:18     ` mst
2020-09-01 10:04     ` Philippe Mathieu-Daudé
2020-09-01 10:04       ` Philippe Mathieu-Daudé
2020-09-01 10:04       ` Philippe Mathieu-Daudé
2020-08-30  6:59   ` Andreas Gustafsson
2020-08-30  6:59     ` [Bug 1892540] " Andreas Gustafsson
2020-09-01 10:03     ` Philippe Mathieu-Daudé
2020-09-01 10:03       ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-09-01 10:04       ` Andreas Gustafsson
2020-09-01 10:04         ` [Bug 1892540] " Andreas Gustafsson
2020-10-21  9:25         ` Mark Cave-Ayland
2020-10-21  9:25           ` [Bug 1892540] " Mark Cave-Ayland
2020-08-22 14:36 ` [Bug 1892540] Re: qemu can no longer boot NetBSD/sparc Philippe Mathieu-Daudé
2020-11-21 23:46 ` Peter Maydell
2020-11-22 11:05   ` Mark Cave-Ayland
2020-11-22 11:05     ` Mark Cave-Ayland
2020-11-23 11:39   ` mst
2020-11-23  8:20 ` Mark Cave-Ayland
2020-12-10  8:42 ` Thomas Huth
2020-08-22 14:15 [RFC PATCH] hw/display/tcx: Allow 64-bit accesses to framebuffer stippler and blitter Philippe Mathieu-Daudé
2020-08-22 14:15 ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-10-24 20:51 [PATCH v3] " Philippe Mathieu-Daudé
2020-10-24 20:51 ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-10-25 10:55 ` Mark Cave-Ayland
2020-10-25 10:55   ` [Bug 1892540] " Mark Cave-Ayland
2020-10-25 11:42   ` Philippe Mathieu-Daudé
2020-10-25 11:42     ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-10-28  8:23 [PULL 00/10] qemu-sparc queue 20201028 Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 01/10] sparc32-dma: use object_initialize_child() for espdma and ledma child objects Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 02/10] sparc32-ledma: use object_initialize_child() for lance child object Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 03/10] sparc32-espdma: use object_initialize_child() for esp " Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 04/10] sparc32-ledma: don't reference nd_table directly within the device Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 05/10] sabre: don't call sysbus_mmio_map() in sabre_realize() Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 06/10] hw/display/tcx: Allow 64-bit accesses to framebuffer stippler and blitter Mark Cave-Ayland
2020-10-28  8:23   ` [Bug 1892540] " Mark Cave-Ayland
2020-11-20 16:16   ` Philippe Mathieu-Daudé
2020-10-28  8:23 ` [PULL 07/10] sabre: increase number of PCI bus IRQs from 32 to 64 Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 08/10] hw/pci-host/sabre: Update documentation link Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 09/10] hw/pci-host/sabre: Remove superfluous address range check Mark Cave-Ayland
2020-10-28  8:23 ` [PULL 10/10] hw/pci-host/sabre: Simplify code initializing variable once Mark Cave-Ayland
2020-10-31 14:42 ` [PULL 00/10] qemu-sparc queue 20201028 Peter Maydell
2020-11-20  8:17 [PATCH for-5.2] hw/display/tcx: add missing 64-bit access for framebuffer blitter Mark Cave-Ayland
2020-11-20  8:17 ` [Bug 1892540] " Mark Cave-Ayland
2020-11-20 10:18 ` Philippe Mathieu-Daudé
2020-11-20 10:18   ` [Bug 1892540] " Philippe Mathieu-Daudé
2020-11-23  8:14 ` Mark Cave-Ayland
2020-11-23  8:14   ` [Bug 1892540] " Mark Cave-Ayland

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