Date: Thu, 22 Mar 2001 16:42:03 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: Matthew Jacob <mjacob@feral.com> Cc: arch@FreeBSD.org Subject: Re: Critical Regions Round II Message-ID: <XFMail.010322164203.jhb@FreeBSD.org> In-Reply-To: <Pine.LNX.4.21.0103221539400.14792-100000@zeppo.feral.com>
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On 22-Mar-01 Matthew Jacob wrote: >> Hrm, is a ldq any different from a ldl to the alpha? > > Umm... yup... 8 bytes instead of 4... I meant more in terms of speed, sorry. :) I knew the 8 vs. 4 bit. :) >> If ldq is faster I could >> make it be a register_t (and thus a __int64_t). I'll probably change it to >> register_t on x86 and ia64 as it simply holds the saved value of a register >> (eflags on x86, psr on ia64). > > I don't think the speed is an issue either way. Ok, then I'll use register_t since the IPL is part of the process status register and since it's put in a0 before the PAL call.. >> > What's wrong with alpha having >> > >> > disable_intr() calls MD/platform function that disables >> > mainbridge >> ints >> > enable_intr() calls MD/platform function that enables mainbridge ints >> > >> > I believe that this actually is possible. >> >> That's fine, however, with this change, disable/enable_intr() are actually >> called in very few places. Mostly in trap() on x86 due to hacks to work >> around >> Cyrix bugs, and in configure(). Everything else uses critical_*. >> >> Well, the joy driver needs fixing (it should use critical_*) as does the >> bktr >> driver. The x86 pcvt driver is also obnoxious, but its x86 specific, and >> the >> pc98 spkr and dma drivers should be using critical_* so that they work in a >> nested fashion. Hmm, and x86 profiling, though again, that can use >> critical_*. >> Kernel x86 profiling with SMP is broken in lots of interesting ways. > > > Let's put it this way...if I have to solve what appear to be obscure bugs by > disabling interrupts in the alpha MD code somewhere, I'll instantiate such a > function (again) if it's no longer there. Ok. Or you could always just call alpha_pal_swpipl(). :) -- John Baldwin <jhb@FreeBSD.org> -- http://www.FreeBSD.org/~jhb/ PGP Key: http://www.baldwin.cx/~john/pgpkey.asc "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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