From: Paul Mackerras <paulus@samba.org>
To: "Siva Prasad" <sprasad@bivio.net>
Cc: linuxppc-embedded@ozlabs.org, linuxppc-dev@ozlabs.org
Subject: RE: PTE entries
Date: Thu, 3 May 2007 08:03:25 +1000 [thread overview]
Message-ID: <17977.2733.78406.322755@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <D83235F0F3C86D4D889D8B9A0DA8C6D762D0F8@corpexc01.corp.networkrobots.com>
Siva Prasad writes:
> Are there any other places where we have self modifying code in Linux
> kernel, other than in arch/powerpc/mm/ppc_mmu_32.c:MMU_init_hw()
> (basically modified create_hpte and flush_hash_page)
Yes, the cpu feature stuff writes nops over various bits of code
depending on what cpu you're running on. See do_feature_fixups() in
arch/powerpc/kernel/cputable.c.
> Instead of using addis, why can't we move it from SDR1 register and mask
> the second half. SDR1 has the required value. Right?
> May be I am missing something here.
mtspr is slow on most processors, certainly slower than addis.
Paul.
next prev parent reply other threads:[~2007-05-02 22:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-20 4:34 PTE entries Siva Prasad
2007-04-24 1:05 ` Benjamin Herrenschmidt
2007-04-25 3:34 ` Siva Prasad
2007-04-25 3:50 ` Benjamin Herrenschmidt
2007-05-02 19:58 ` Siva Prasad
2007-05-02 22:03 ` Paul Mackerras [this message]
2007-05-02 22:12 ` Benjamin Herrenschmidt
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