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Retrofit changes from i386/pmap.c rev 1.328-1.331.

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XXX should really replace the pmap_{new,swapin,swapout,dispose}_{proc,thread}
functions with the much cleaner sparc64 versions.
This commit is contained in:
Peter Wemm 2002-07-04 01:53:09 +00:00
parent 8692e184dc
commit 19594b9110
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=99399
1 changed files with 31 additions and 43 deletions
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74
sys/alpha/alpha/pmap.c
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@ -914,7 +914,7 @@ pmap_new_proc(struct proc *p)
pt_entry_t *ptek, oldpte;
/*
* allocate object for the upages
* allocate object for the upage
*/
upobj = p->p_upages_obj;
if (upobj == NULL) {
@ -935,7 +935,7 @@ pmap_new_proc(struct proc *p)
for (i = 0; i < UAREA_PAGES; i++) {
/*
* Get a kernel stack page
* Get a kernel page for the uarea
*/
m = vm_page_grab(upobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
@ -945,11 +945,11 @@ pmap_new_proc(struct proc *p)
m->wire_count++;
cnt.v_wire_count++;
oldpte = *(ptek + i);
/*
* Enter the page into the kernel address space.
*/
*(ptek + i) = pmap_phys_to_pte(VM_PAGE_TO_PHYS(m))
oldpte = ptek[i];
ptek[i] = pmap_phys_to_pte(VM_PAGE_TO_PHYS(m))
| PG_ASM | PG_KRE | PG_KWE | PG_V;
if (oldpte)
pmap_invalidate_page(kernel_pmap, up + i * PAGE_SIZE);
@ -973,7 +973,7 @@ pmap_dispose_proc(p)
vm_object_t upobj;
vm_offset_t up;
vm_page_t m;
pt_entry_t *ptek, oldpte;
pt_entry_t *ptek;
upobj = p->p_upages_obj;
up = (vm_offset_t)p->p_uarea;
@ -983,8 +983,7 @@ pmap_dispose_proc(p)
if (m == NULL)
panic("pmap_dispose_proc: upage already missing?");
vm_page_busy(m);
oldpte = *(ptek + i);
*(ptek + i) = 0;
ptek[i] = 0;
pmap_invalidate_page(kernel_pmap, up + i * PAGE_SIZE);
vm_page_unwire(m, 0);
vm_page_free(m);
@ -1069,43 +1068,39 @@ pmap_new_thread(struct thread *td)
pt_entry_t *ptek, oldpte;
/*
* allocate object for the upages
* allocate object for the kstack
*/
ksobj = td->td_kstack_obj;
if (ksobj == NULL) {
ksobj = vm_object_allocate(OBJT_DEFAULT, KSTACK_PAGES);
td->td_kstack_obj = ksobj;
}
ksobj = vm_object_allocate(OBJT_DEFAULT, KSTACK_PAGES);
td->td_kstack_obj = ksobj;
#ifdef KSTACK_GUARD
/* get a kernel virtual address for the kstack for this thread */
ks = td->td_kstack;
if (ks == 0) {
ks = kmem_alloc_nofault(kernel_map,
(KSTACK_PAGES + 1) * PAGE_SIZE);
if (ks == NULL)
panic("pmap_new_thread: kstack allocation failed");
ks += PAGE_SIZE;
td->td_kstack = ks;
}
ks = kmem_alloc_nofault(kernel_map, (KSTACK_PAGES + 1) * PAGE_SIZE);
if (ks == NULL)
panic("pmap_new_thread: kstack allocation failed");
ptek = vtopte(ks - PAGE_SIZE);
/* Set the first page to be the unmapped guard page. */
ptek = vtopte(ks);
oldpte = *ptek;
*ptek = 0;
if (oldpte)
pmap_invalidate_page(kernel_pmap, ks - PAGE_SIZE);
pmap_invalidate_page(kernel_pmap, ks);
/* move to the next page, which is where the real stack starts. */
ks += PAGE_SIZE;
td->td_kstack = ks;
ptek++;
#else
/* get a kernel virtual address for the kstack for this thread */
ks = td->td_kstack;
if (ks == 0) {
ks = kmem_alloc_nofault(kernel_map, KSTACK_PAGES * PAGE_SIZE);
if (ks == NULL)
panic("pmap_new_thread: kstack allocation failed");
td->td_kstack = ks;
}
ks = kmem_alloc_nofault(kernel_map, KSTACK_PAGES * PAGE_SIZE);
if (ks == NULL)
panic("pmap_new_thread: kstack allocation failed");
td->td_kstack = ks;
ptek = vtopte(ks);
#endif
/*
* For the length of the stack, link in a real page of ram for each
* page of stack.
*/
for (i = 0; i < KSTACK_PAGES; i++) {
/*
* Get a kernel stack page
@ -1118,11 +1113,11 @@ pmap_new_thread(struct thread *td)
m->wire_count++;
cnt.v_wire_count++;
oldpte = *(ptek + i);
/*
* Enter the page into the kernel address space.
*/
*(ptek + i) = pmap_phys_to_pte(VM_PAGE_TO_PHYS(m))
oldpte = ptek[i];
ptek[i] = pmap_phys_to_pte(VM_PAGE_TO_PHYS(m))
| PG_ASM | PG_KRE | PG_KWE | PG_V;
if (oldpte)
pmap_invalidate_page(kernel_pmap, ks + i * PAGE_SIZE);
@ -1146,23 +1141,17 @@ pmap_dispose_thread(td)
vm_object_t ksobj;
vm_offset_t ks;
vm_page_t m;
pt_entry_t *ptek, oldpte;
pt_entry_t *ptek;
ksobj = td->td_kstack_obj;
ks = td->td_kstack;
ptek = vtopte(ks);
#ifdef KSTACK_GUARD
ks -= PAGE_SIZE;
for (i = 1; i < (KSTACK_PAGES + 1); i++) {
#else
for (i = 0; i < KSTACK_PAGES; i++) {
#endif
m = vm_page_lookup(ksobj, i);
if (m == NULL)
panic("pmap_dispose_thread: kstack already missing?");
vm_page_busy(m);
oldpte = *(ptek + i);
*(ptek + i) = 0;
ptek[i] = 0;
pmap_invalidate_page(kernel_pmap, ks + i * PAGE_SIZE);
vm_page_unwire(m, 0);
vm_page_free(m);
@ -1173,11 +1162,10 @@ pmap_dispose_thread(td)
* address map.
*/
#ifdef KSTACK_GUARD
kmem_free(kernel_map, ks, (KSTACK_PAGES + 1) * PAGE_SIZE);
kmem_free(kernel_map, ks - PAGE_SIZE, (KSTACK_PAGES + 1) * PAGE_SIZE);
#else
kmem_free(kernel_map, ks, KSTACK_PAGES * PAGE_SIZE);
#endif
td->td_kstack_obj = NULL;
vm_object_deallocate(ksobj);
}