diff options
Diffstat (limited to 'sys/vm/device_pager.c')
| -rw-r--r-- | sys/vm/device_pager.c | 36 |
1 files changed, 22 insertions, 14 deletions
diff --git a/sys/vm/device_pager.c b/sys/vm/device_pager.c index a200b9c2a8db..3783be436893 100644 --- a/sys/vm/device_pager.c +++ b/sys/vm/device_pager.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)device_pager.c 8.1 (Berkeley) 6/11/93 - * $Id: device_pager.c,v 1.36 1998/12/07 21:58:50 archie Exp $ + * $Id: device_pager.c,v 1.31 1998/07/15 02:32:35 bde Exp $ */ #include <sys/param.h> @@ -50,7 +50,6 @@ #include <vm/vm_object.h> #include <vm/vm_page.h> #include <vm/vm_pager.h> -#include <vm/vm_zone.h> static void dev_pager_init __P((void)); static vm_object_t dev_pager_alloc __P((void *, vm_ooffset_t, vm_prot_t, @@ -65,8 +64,8 @@ static boolean_t dev_pager_haspage __P((vm_object_t, vm_pindex_t, int *, /* list of device pager objects */ static struct pagerlst dev_pager_object_list; -static vm_zone_t fakepg_zone; -static struct vm_zone fakepg_zone_store; +/* list of available vm_page_t's */ +static TAILQ_HEAD(, vm_page) dev_pager_fakelist; static vm_page_t dev_pager_getfake __P((vm_offset_t)); static void dev_pager_putfake __P((vm_page_t)); @@ -87,8 +86,7 @@ static void dev_pager_init() { TAILQ_INIT(&dev_pager_object_list); - fakepg_zone = &fakepg_zone_store; - zinitna(fakepg_zone, NULL, "DP fakepg", sizeof(struct vm_page), 0, 0, 2); + TAILQ_INIT(&dev_pager_fakelist); } static vm_object_t @@ -97,8 +95,7 @@ dev_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot, vm_ooffset_t fo dev_t dev; d_mmap_t *mapfunc; vm_object_t object; - unsigned int npages; - vm_offset_t off; + unsigned int npages, off; /* * Make sure this device can be mapped. @@ -207,8 +204,11 @@ dev_pager_getpages(object, m, count, reqpage) if (mapfunc == NULL || mapfunc == (d_mmap_t *)nullop) panic("dev_pager_getpage: no map function"); - paddr = pmap_phys_address((*mapfunc) ((dev_t) dev, (vm_offset_t) offset << PAGE_SHIFT, prot)); - KASSERT(paddr != -1,("dev_pager_getpage: map function returns error")); + paddr = pmap_phys_address((*mapfunc) ((dev_t) dev, (int) offset << PAGE_SHIFT, prot)); +#ifdef DIAGNOSTIC + if (paddr == -1) + panic("dev_pager_getpage: map function returns error"); +#endif /* * Replace the passed in reqpage page with our own fake page and free up the * all of the original pages. @@ -255,15 +255,23 @@ dev_pager_getfake(paddr) vm_offset_t paddr; { vm_page_t m; - - m = zalloc(fakepg_zone); + int i; + + if (TAILQ_FIRST(&dev_pager_fakelist) == NULL) { + m = (vm_page_t) malloc(PAGE_SIZE * 2, M_VMPGDATA, M_WAITOK); + for (i = (PAGE_SIZE * 2) / sizeof(*m); i > 0; i--) { + TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq); + m++; + } + } + m = TAILQ_FIRST(&dev_pager_fakelist); + TAILQ_REMOVE(&dev_pager_fakelist, m, pageq); m->flags = PG_BUSY | PG_FICTITIOUS; m->valid = VM_PAGE_BITS_ALL; m->dirty = 0; m->busy = 0; m->queue = PQ_NONE; - m->object = NULL; m->wire_count = 1; m->hold_count = 0; @@ -278,5 +286,5 @@ dev_pager_putfake(m) { if (!(m->flags & PG_FICTITIOUS)) panic("dev_pager_putfake: bad page"); - zfree(fakepg_zone, m); + TAILQ_INSERT_TAIL(&dev_pager_fakelist, m, pageq); } |