diff options
| -rw-r--r-- | sys/vm/vm_map.c | 67 |
1 files changed, 47 insertions, 20 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 49d1149..cd44c08 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -135,6 +135,42 @@ vm_mapspace_insert(struct vm_mapspace *ms, struct vm_mapping *mapping) TAILQ_INSERT_HEAD(q, mapping, link); } +/* + * Create an anonymous mapping. + * + * @addr: Address to map. + * @prot: Protection flags. + * + * Returns zero on failure. + */ +static paddr_t +vm_anon_map(void *addr, vm_prot_t prot, size_t len) +{ + struct proc *td = this_td(); + const size_t GRANULE = vm_get_page_size(); + + paddr_t physmem; + int status; + + /* Allocate the physical memory */ + physmem = vm_alloc_pageframe(len / GRANULE); + if (physmem == 0) + return 0; + + /* + * XXX: There is no need to worry about alignment yet + * as vm_map_create() handles that internally. + */ + prot |= PROT_USER; + status = vm_map_create(td->addrsp, (vaddr_t)addr, physmem, prot, len); + if (status != 0) { + vm_free_pageframe(physmem, len / GRANULE); + return 0; + } + + return physmem; +} + static int munmap(void *addr, size_t len) { @@ -180,11 +216,10 @@ mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off) struct vm_mapping *mapping = ALLOC_MAPPING(); size_t misalign = ((vaddr_t)addr) & (GRANULE - 1); - int status; - paddr_t physmem; + paddr_t physmem = 0; + /* Ensure of valid prot flags */ if ((prot & ~PROT_MASK) != 0) - /* Invalid prot */ return MAP_FAILED; /* @@ -197,24 +232,16 @@ mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off) addr = (void *)physmem; } - /* Handle an anonymous map request */ + /* + * Now we check what type of map request + * this is. + */ if (__TEST(flags, MAP_ANONYMOUS)) { - /* Allocate the physical memory */ - physmem = vm_alloc_pageframe(len / GRANULE); - if (physmem == 0) - return MAP_FAILED; - - /* - * XXX: There is no need to worry about alignment yet - * as vm_map_create() handles that internally. - */ - prot |= PROT_USER; - status = vm_map_create(td->addrsp, (vaddr_t)addr, physmem, prot, len); - if (status != 0) { - vm_free_pageframe(physmem, len / GRANULE); - return MAP_FAILED; - } - } else { + /* Handle an anonymous map request */ + physmem = vm_anon_map(addr, prot, len); + } + + if (physmem == 0) { return MAP_FAILED; } |