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Try to keep interrupts enabled more. Do the %fs ans %gs load *after* the LDT 

is restored.
This commit is contained in:
mycroft 1994-04-04 15:56:47 +00:00
parent a9fe3fa9cb
commit 39b1222c87
1 changed files with 20 additions and 12 deletions
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32
sys/arch/i386/i386/locore.s
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@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)locore.s 7.3 (Berkeley) 5/13/91
* $Id: locore.s,v 1.51 1994/04/04 09:42:52 mycroft Exp $
* $Id: locore.s,v 1.52 1994/04/04 15:56:47 mycroft Exp $
*/
@ -1440,6 +1440,9 @@ sw1: bsfl %ecx,%ebx # find a full q
movl %eax,P_RLINK(%edi) /* isolate process to run */
/* It's okay to take interrupts here. */
sti
/* Skip context switch if same process. */
movl _curproc,%esi
cmpl %edi,%esi
@ -1478,20 +1481,13 @@ swtch_exited:
/* Restore context. */
movl P_ADDR(%edi),%edx
/* No interrupts while loading new state. */
cli
/* Switch address space. */
movl PCB_CR3(%edx),%ebx
movl %ebx,%cr3
movl PCB_ESP(%edx),%esp
movl PCB_EBP(%edx),%ebp
movl PCB_FS(%edx),%eax
movl %ax,%fs
movl PCB_GS(%edx),%eax
movl %ax,%gs
movl %edi,_curproc # into next process
movl %edx,_curpcb
#ifdef USER_LDT
cmpl $0,PCB_USERLDT(%edx)
jnz 1f
@ -1506,7 +1502,19 @@ swtch_exited:
popl %edx
2:
#endif
sti # splx() doesn't do an sti/cli
movl PCB_ESP(%edx),%esp
movl PCB_EBP(%edx),%ebp
movl PCB_FS(%edx),%eax
movl %ax,%fs
movl PCB_GS(%edx),%eax
movl %ax,%gs
movl %edi,_curproc # into next process
movl %edx,_curpcb
/* Interrupts are okay again. */
sti
swtch_return:
/* Old _cpl is already on the stack. */