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From: Christoph Hellwig <hch@lst.de>
To: Fredrik Noring <noring@nocrew.org>
Cc: Christoph Hellwig <hch@lst.de>,
	"Maciej W. Rozycki" <macro@linux-mips.org>,
	Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
	linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and cpu_has_64bit_addresses
Date: Wed, 25 Mar 2020 10:54:35 +0100	[thread overview]
Message-ID: <20200325095435.GA27807@lst.de> (raw)
In-Reply-To: <20200325092446.GB28706@sx9>

On Wed, Mar 25, 2020 at 10:24:46AM +0100, Fredrik Noring wrote:
> > > The (slightly outdated) patch series under review
> > > is available here:
> > > 
> > > https://lore.kernel.org/linux-mips/cover.1567326213.git.noring@nocrew.org/T/
> > 
> > You don't happen to have a git tree available somewhere?
> 
> https://github.com/frno7/linux/tree/ps2-v5.4
> 
> is stable at v5.4,
> 
> https://github.com/frno7/linux/tree/ps2-master
> 
> has more experimental stuff (also at v5.4 at the moment). There are some
> (work-in-progress) notes on the R5900 psABI, that may be of interest, here:
> 
> https://github.com/frno7/linux/wiki/R5900-processor-specific-ABI-(psABI)

So from what I can tell this uses a 32-bit kernel and 32-bit userspace,
and sets both pu_has_64bit_gp_regs and cpu_has_64bit_addresses to 0.

Now if you ever wanted to make use of the 64-bit registeres it would
require quite some changes, which probably really should have a new
Kconfig option.  In fact a lot of the workaround for the 64-bit
registeres that are in the code already should be keyed off such an
option rather than CONFIG_CPU_R5900.

  reply	other threads:[~2020-03-25  9:54 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 16:15 MIPS ioremap cleanups Christoph Hellwig
2020-03-24 16:15 ` [PATCH 1/6] MIPS: remove cpu_has_64bit_gp_regs and cpu_has_64bit_addresses Christoph Hellwig
2020-03-25  2:36   ` Maciej W. Rozycki
2020-03-25  8:30     ` Christoph Hellwig
2020-03-25  8:55       ` Fredrik Noring
2020-03-25  8:58         ` Christoph Hellwig
2020-03-25  9:24           ` Fredrik Noring
2020-03-25  9:54             ` Christoph Hellwig [this message]
2020-03-25 11:04               ` Fredrik Noring
2020-03-24 16:15 ` [PATCH 2/6] MIPS: cleanup fixup_bigphys_addr handling Christoph Hellwig
2020-03-24 16:15 ` [PATCH 3/6] MIPS: merge __ioremap_mode into ioremap_prot Christoph Hellwig
2020-03-24 16:15 ` [PATCH 4/6] MIPS: split out the 64-bit ioremap implementation Christoph Hellwig
2020-03-24 16:15 ` [PATCH 5/6] MIPS: move ioremap_prot und iounmap out of line Christoph Hellwig
2020-03-24 16:15 ` [PATCH 6/6] MIPS: use ioremap_page_range Christoph Hellwig

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