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#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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fpusysrfork(Ureg*)
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{
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	/*
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	 * Called early in the non-interruptible path of
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	 * sysrfork() via the machine-dependent syscall() routine.
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	 * Save the state so that it can be easily copied
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	 * to the child process later.
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	 */
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}
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void
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fpusysrforkchild(Proc*, Ureg*, Proc*)
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{
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	/*
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	 * Called later in sysrfork() via the machine-dependent
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	 * sysrforkchild() routine.
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	 * Copy the parent FPU state to the child.
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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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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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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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}