diff options
Diffstat (limited to 'sys/uvm/uvm_page.c')
| -rw-r--r-- | sys/uvm/uvm_page.c | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/sys/uvm/uvm_page.c b/sys/uvm/uvm_page.c index 9838cdbd2c0..1a59da29d07 100644 --- a/sys/uvm/uvm_page.c +++ b/sys/uvm/uvm_page.c @@ -1,4 +1,4 @@ -/* $OpenBSD: uvm_page.c,v 1.2 1999/02/26 05:32:07 art Exp $ */ +/* $OpenBSD: uvm_page.c,v 1.3 1999/07/23 14:47:06 ho Exp $ */ /* $NetBSD: uvm_page.c,v 1.15 1998/10/18 23:50:00 chs Exp $ */ /* @@ -930,6 +930,51 @@ uvm_pagealloc_strat(obj, off, anon, strat, free_list) return (NULL); } +/* + * uvm_pagealloc_contig: allocate contiguous memory. + * + * XXX - fix comment. + */ + +vaddr_t +uvm_pagealloc_contig(size, low, high, alignment) + vaddr_t size; + vaddr_t low, high; + vaddr_t alignment; +{ + struct pglist pglist; + struct vm_page *pg; + vaddr_t addr, temp_addr; + + size = round_page(size); + + TAILQ_INIT(&pglist); + if (uvm_pglistalloc(size, low, high, alignment, 0, + &pglist, 1, FALSE)) + return 0; + addr = vm_map_min(kernel_map); + if (uvm_map(kernel_map, &addr, size, NULL, + UVM_UNKNOWN_OFFSET, TRUE) != KERN_SUCCESS) + addr = 0; + temp_addr = addr; + for (pg = TAILQ_FIRST(&pglist); pg != NULL; + pg = TAILQ_NEXT(pg, pageq)) { + pg->uobject = uvm.kernel_object; + pg->offset = temp_addr - vm_map_min(kernel_map); + uvm_pageinsert(pg); + uvm_pagewire(pg); +#if defined(PMAP_NEW) + pmap_kenter_pa(temp_addr, VM_PAGE_TO_PHYS(pg), + VM_PROT_READ|VM_PROT_WRITE); +#else + pmap_enter(kernel_map->pmap, temp_addr, VM_PAGE_TO_PHYS(pg), + UVM_PROT_READ|UVM_PROT_WRITE, TRUE); +#endif + temp_addr += PAGE_SIZE; + } + return addr; +} + /* * uvm_pagerealloc: reallocate a page from one object to another * |