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Code Issues Releases Activity

Save are floating point state in cpu_switch() if needed instead of relying

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completely on lazy floating point state saving.  This is needed for the
SMP case since processes can migrate to other CPUs.

Submitted by:	dfr
This commit is contained in:
John Baldwin 2001-04-17 18:27:55 +00:00
parent 2b77cdeac1
commit 5d52039847
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=75622
2 changed files with 8 additions and 1 deletions
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2
sys/alpha/alpha/machdep.c
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@ -2131,7 +2131,7 @@ alpha_fpstate_save(struct proc *p, int write)
critical_t s;
s = critical_enter();
if (p == PCPU_GET(fpcurproc)) {
if (p != NULL && p == PCPU_GET(fpcurproc)) {
/*
* If curproc != fpcurproc, then we need to enable FEN
* so that we can dump the fp state.

7
sys/alpha/alpha/swtch.s
View File

@ -140,6 +140,13 @@ Lcs1: LDGP(pv)
cmpeq s0, s2, t0 /* oldproc == newproc? */
bne t0, Lcs7 /* Yes! Skip! */
/*
* Save fp state if we have some.
*/
mov s0, a0 /* curproc */
ldiq a1, 1 /* clear fpcurproc */
CALL(alpha_fpstate_save)
/*
* Deactivate the old address space before activating the
* new one. We need to do this before activating the