Date: Wed, 31 May 2006 20:41:17 +0300 From: m.boyarov@bsd.by (Max N. Boyarov) To: Olivier Houchard <mlfbsd@ci0.org> Cc: freebsd-arm@freebsd.org Subject: Re: i80321reg.h Message-ID: <7hd5du3xdu.fsf@bsd.by> In-Reply-To: <20060531175025.GA97299@ci0.org> (Olivier Houchard's message of "Wed, 31 May 2006 19:50:25 %2B0200") References: <7hodxe4132.fsf@bsd.by> <20060531170631.GA96970@ci0.org> <7hk6823yzj.fsf@bsd.by> <20060531175025.GA97299@ci0.org>
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>>>>> "OH" == Olivier Houchard writes: OH> On Wed, May 31, 2006 at 08:06:40PM +0300, Max N. Boyarov wrote: >> >> >>>>> "OH" == Olivier Houchard writes: >> >> OH> On Wed, May 31, 2006 at 07:21:21PM +0300, Max N. Boyarov wrote: >> >> >> >> Hi! >> >> >> >> What document should I read in order to understand >> >> how to calculate the defines that are used in i80321reg.h ? >> >> >> >> OH> Hi Max, >> Hi Olivier, >> OH> I'm not sure I understand the question. However, those most of those values >> OH> come from the Intel 80321 I/O Processor developer's manual, available here : >> OH> http://www.intel.com/design/iio/manuals/273517.htm >> >> Sorry for my english :). I meant, I do not know how freebsd works with virtual >> memory, i.e. what address range is used for user applications, where kernel resides. >> What would you recommend to read about that? Just for education purposes :) My concern >> is 80321 xcale port only (not generic). >> OH> No worries, my english isn't better :) OH> Unfortunately I'm not sure there's something explaining this beside the code OH> itself, so I'm gonna try to answer. OH> Most of this is the same for every arm port, including the 80321. OH> The interesting #define are mostly in sys/arm/include/vmparam.h OH> * The line between user space and kernel space OH> * Mappings >= KERNEL_BASE are constant across all processes OH> */ OH> #define KERNBASE 0xc0000000 OH> So generally speaking, whatever is >= 0xc0000000 is kernelland, whatever is < OH> is userland. OH> In arm/xscale/iq31244_machdep.c (which should be usable for every i80321 OH> port, and thus has an unaccurate name), we map 0xfe800000 (IQ80321_OBIO_BASE), OH> physical == virtual, to be able to use the UART early, OH> then we use the virtual address 0xfe400000 (IQ80321_IOW_VBASE) to map the ATU OH> stuff and the CPU registers. OH> I'm still not sure I properly answer to your question:) Feel free to ask OH> for more. Many thanks, I shall continue to experiments with i80219 :) -- Best regards, Max N. Boyarov BSD.by Team. E-mail: m.boyarov@bsd.by Minsk, Republic of Belarus http://bsd.by
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