From: David Daney <ddaney@caviumnetworks.com>
To: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: linux-mips@linux-mips.org, "Maciej W. Rozycki" <macro@linux-mips.org>
Subject: Re: [PATCH v3] Virtual memory size detection for 64 bit MIPS CPUs
Date: Mon, 01 Feb 2010 15:44:21 -0800 [thread overview]
Message-ID: <4B676755.10600@caviumnetworks.com> (raw)
In-Reply-To: <1265064686-31278-1-git-send-email-guenter.roeck@ericsson.com>
Guenter Roeck wrote:
> Linux kernel 2.6.32 and later allocates memory from the top of virtual memory
> space.
>
> This patch implements virtual memory size detection for 64 bit MIPS CPUs
> to avoid resulting crashes.
>
> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
[...]
>
> +static inline void cpu_set_vmbits(struct cpuinfo_mips *c)
> +{
> + if (cpu_has_64bits) {
> + write_c0_entryhi(0xfffffffffffff000ULL);
macro indicated that we need to avoid hazards here on R4000.
Perhaps adding:
back_to_back_c0_hazard();
> + c->vmbits = fls64(read_c0_entryhi() & 0x3ffffffffffff000ULL);
> + } else
> + c->vmbits = 32;
> +}
> +
next prev parent reply other threads:[~2010-02-01 23:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-01 22:51 [PATCH v3] Virtual memory size detection for 64 bit MIPS CPUs Guenter Roeck
2010-02-01 23:44 ` David Daney [this message]
2010-02-02 0:10 ` Guenter Roeck
2010-02-02 11:42 ` Ralf Baechle
2010-02-02 15:24 ` Maciej W. Rozycki
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