Date: Mon, 25 Nov 1996 03:43:03 -0800 (PST) From: Peter Wemm <peter> To: freebsd-smp Subject: cvs commit: sys/i386/i386 locore.s swtch.s sys/i386/include pmap.h Message-ID: <199611251143.DAA10036@freefall.freebsd.org>
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peter 96/11/25 03:42:59
Modified: i386/include pmap.h
i386/i386 locore.s swtch.s
Log:
Implement part 1 of per-cpu private pages.
This lowers th max kernel VM from 252MB to 248MB so that we can steal
a PDE slot for the per-cpu page table. This is copied on cpu_switch().
Note, this is not complete yet. Presently, only one set is created for
boot cpu.
At present, there is a 4K page at 0xff800000, there is a 4K page
mapping the default local apic address to 0xff801000, and the IO apic
to 0xff802000. These are just for experimenting, don't panic. :-)
Things like curproc, curpcb, runtime, cpu_id, etc will be linked to load
in the private page once it's finished, eliminating the need for macros
looking up arrays with NCPU elements etc.
Each private page is also mapped into the global kvm space, there will be
an array of pointers to them, so it'll be possible to get to cpu#6's
curproc by doing doing something like: cpudata[6]->curproc. This assumes
there will be a 'struct' to make dereferenced accesses to the private
pages.
Revision Changes Path
1.2 +86 -45 sys/i386/include/pmap.h
1.31 +64 -0 sys/i386/i386/locore.s
1.27 +25 -0 sys/i386/i386/swtch.s
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