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Code Issues Releases Activity

Next-to-leading-order perturbation of synchronization operations for

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switching the user segment register. All races should now be closed and
a minimum of pipelines flushes be required to close them.
This commit is contained in:
Nathan Whitehorn 2010-10-31 22:55:51 +00:00
parent 3b18190fe9
commit ad6b3047a4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=214607
3 changed files with 5 additions and 5 deletions
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4
sys/powerpc/aim/copyinout.c
View File

@ -117,9 +117,9 @@ set_user_sr(pmap_t pm, const void *addr)
if (curthread->td_pcb->pcb_cpu.aim.usr_vsid == vsid)
return;
__asm __volatile ("sync; mtsr %0,%1; sync; isync" :: "n"(USER_SR),
"r"(vsid));
__asm __volatile("isync");
curthread->td_pcb->pcb_cpu.aim.usr_vsid = vsid;
__asm __volatile("mtsr %0,%1; isync" :: "n"(USER_SR), "r"(vsid));
}
#endif

2
sys/powerpc/aim/swtch32.S
View File

@ -89,7 +89,6 @@ ENTRY(cpu_switch)
mflr %r16 /* Save the link register */
stw %r16,PCB_LR(%r6)
mfsr %r16,USER_SR /* Save USER_SR for copyin/out */
isync
stw %r16,PCB_AIM_USR_VSID(%r6)
stw %r1,PCB_SP(%r6) /* Save the stack pointer */
stw %r2,PCB_TOC(%r6) /* Save the TOC pointer */
@ -162,6 +161,7 @@ blocked_loop:
lwz %r5,PCB_LR(%r3) /* Load the link register */
mtlr %r5
lwz %r5,PCB_AIM_USR_VSID(%r3) /* Load the USER_SR segment reg */
isync
mtsr USER_SR,%r5
isync
lwz %r1,PCB_SP(%r3) /* Load the stack pointer */

4
sys/powerpc/aim/swtch64.S
View File

@ -113,7 +113,6 @@ ENTRY(cpu_switch)
li %r15,0 /* Save user segment for copyin/out */
li %r16,USER_SLB_SLOT
slbmfev %r15, %r16
isync
std %r15,PCB_AIM_USR_VSID(%r6)
mr %r14,%r3 /* Copy the old thread ptr... */
@ -222,6 +221,7 @@ blocked_loop:
ori %r5,%r5,USER_ADDR@highera
sldi %r5,%r5,32
oris %r5,%r5,USER_ADDR@ha
isync
slbie %r5
lis %r6,USER_SLB_SLBE@highesta
ori %r6,%r6,USER_SLB_SLBE@highera
@ -230,8 +230,8 @@ blocked_loop:
ori %r6,%r6,USER_SLB_SLBE@l
ld %r5,PCB_AIM_USR_VSID(%r3)
slbmte %r5,%r6
isync
/*
* Perform a dummy stdcx. to clear any reservations we may have
* inherited from the previous thread. It doesn't matter if the