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cut/paste the pmap_new_altkstack stuff from the other platforms.

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It's no different here.  Update the rest of the kstack API's for scottl's
changes.
This commit is contained in:
peter 2002-10-11 22:29:22 +00:00
parent 4c790ce032
commit edc920d80d
1 changed files with 47 additions and 3 deletions
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50
sys/ia64/ia64/pmap.c
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@ -712,21 +712,31 @@ pmap_track_modified(vm_offset_t va)
return 0;
}
#ifndef KSTACK_MAX_PAGES
#define KSTACK_MAX_PAGES 32
#endif
/*
* Create the KSTACK for a new thread.
* This routine directly affects the fork perf for a process/thread.
*/
void
pmap_new_thread(struct thread *td)
pmap_new_thread(struct thread *td, int pages)
{
vm_offset_t *ks;
/* Bounds check */
if (pages <= 1)
pages = KSTACK_PAGES;
else if (pages > KSTACK_MAX_PAGES)
pages = KSTACK_MAX_PAGES;
/*
* Use contigmalloc for user area so that we can use a region
* 7 address for it which makes it impossible to accidentally
* lose when recording a trapframe.
*/
ks = contigmalloc(KSTACK_PAGES * PAGE_SIZE, M_PMAP,
ks = contigmalloc(pages * PAGE_SIZE, M_PMAP,
M_WAITOK,
0ul,
256*1024*1024 - 1,
@ -738,6 +748,7 @@ pmap_new_thread(struct thread *td)
KSTACK_PAGES);
td->td_md.md_kstackvirt = ks;
td->td_kstack = IA64_PHYS_TO_RR7(ia64_tpa((u_int64_t)ks));
td->td_kstack_pages = pages;
}
/*
@ -747,11 +758,44 @@ pmap_new_thread(struct thread *td)
void
pmap_dispose_thread(struct thread *td)
{
contigfree(td->td_md.md_kstackvirt, KSTACK_PAGES * PAGE_SIZE, M_PMAP);
int pages;
pages = td->td_kstack_pages;
contigfree(td->td_md.md_kstackvirt, pages * PAGE_SIZE, M_PMAP);
td->td_md.md_kstackvirt = 0;
td->td_kstack = 0;
}
/*
* Set up a variable sized alternate kstack. This appears to be MI.
*/
void
pmap_new_altkstack(struct thread *td, int pages)
{
/* shuffle the original stack */
td->td_altkstack_obj = td->td_kstack_obj;
td->td_altkstack = td->td_kstack;
td->td_altkstack_pages = td->td_kstack_pages;
pmap_new_thread(td, pages);
}
void
pmap_dispose_altkstack(struct thread *td)
{
pmap_dispose_thread(td);
/* restore the original kstack */
td->td_kstack = td->td_altkstack;
td->td_kstack_obj = td->td_altkstack_obj;
td->td_kstack_pages = td->td_altkstack_pages;
td->td_altkstack = 0;
td->td_altkstack_obj = NULL;
td->td_altkstack_pages = 0;
}
/*
* Allow the KSTACK for a thread to be prejudicially paged out.
*/