118 lines
2 KiB
C
118 lines
2 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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int
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fpudevprocio(Proc* proc, void* a, long n, uintptr offset, int write)
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{
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/*
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* Called from procdevtab.read and procdevtab.write
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* allow user process access to the FPU registers.
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* This is the only FPU routine which is called directly
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* from the port code; it would be nice to have dynamic
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* creation of entries in the device file trees...
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*/
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USED(proc, a, n, offset, write);
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return 0;
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}
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void
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fpunotify(Ureg*)
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{
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/*
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* Called when a note is about to be delivered to a
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* user process, usually at the end of a system call.
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* Note handlers are not allowed to use the FPU so
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* the state is marked (after saving if necessary) and
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* checked in the Device Not Available handler.
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*/
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}
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void
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fpunoted(void)
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{
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/*
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* Called from sysnoted() via the machine-dependent
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* noted() routine.
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* Clear the flag set above in fpunotify().
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*/
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}
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void
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fpuprocrestore(Proc*)
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{
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/*
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* The process has been rescheduled and is about to run.
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* Nothing to do here right now. If the process tries to use
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* the FPU again it will cause a Device Not Available
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* exception and the state will then be restored.
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*/
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}
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void
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fpuprocfork(Proc*)
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{
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/*
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* The current process has been forked, save and copy neccesary
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* state to child. Nothing to do here, child proc starts with FPinit.
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*/
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}
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void
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fpuprocsave(Proc*)
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{
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/*
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* Called from sched() and sleep() via the machine-dependent
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* procsave() routine.
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* About to go in to the scheduler.
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* If the process wasn't using the FPU
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* there's nothing to do.
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*/
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}
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void
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fpusysprocsetup(Proc*)
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{
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/*
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* Disable the FPU.
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* Called from sysexec() via sysprocsetup() to
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* set the FPU for the new process.
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*/
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}
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void
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fpuinit(void)
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{
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}
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int
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fpuemu(Ureg* ureg)
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{
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int nfp;
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if(waserror()){
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splhi();
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postnote(up, 1, up->errstr, NDebug);
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return 1;
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}
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spllo();
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nfp = fpiarm(ureg);
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splhi();
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poperror();
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return nfp;
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}
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void
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fpon(void)
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{
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}
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void
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fpoff(void)
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{
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}
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