diff options
Diffstat (limited to 'sys/vm/vm_fault.c')
| -rw-r--r-- | sys/vm/vm_fault.c | 132 |
1 files changed, 0 insertions, 132 deletions
diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c deleted file mode 100644 index 45def7f..0000000 --- a/sys/vm/vm_fault.c +++ /dev/null @@ -1,132 +0,0 @@ -/* - * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team. - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. Neither the name of Hyra nor the names of its - * contributors may be used to endorse or promote products derived from - * this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" - * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE - * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR - * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF - * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS - * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN - * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) - * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - */ - -#include <sys/types.h> -#include <sys/sched.h> -#include <vm/fault.h> -#include <vm/map.h> -#include <vm/pmap.h> -#include <vm/vm.h> -#include <vm/physseg.h> - -static struct vm_mapping * -vm_mapq_search(vm_mapq_t *mq, vaddr_t addr) -{ - struct vm_mapping *mapping; - const struct vm_range *range; - - TAILQ_FOREACH(mapping, mq, link) { - range = &mapping->range; - if (addr >= range->start && addr <= range->end) { - return mapping; - } - } - - return NULL; -} - -static struct vm_mapping * -vm_find_mapping(vaddr_t addr) -{ - struct vm_mapping *mapping; - struct proc *td = this_td(); - vm_mapq_t *mapq; - - mapping = vm_mapping_fetch(&td->mapspace, addr); - if (mapping != NULL) - return mapping; - - /* Need to search other maps */ - for (size_t i = 0; i < MTAB_ENTRIES; ++i) { - mapq = &td->mapspace.mtab[i]; - mapping = vm_mapq_search(mapq, addr); - if (mapping != NULL) - return mapping; - } - - return NULL; -} - -static int -vm_demand_page(struct vm_mapping *mapping, vaddr_t va, vm_prot_t access_type) -{ - struct proc *td; - paddr_t pa_base; - - int s; - size_t granule = vm_get_page_size(); - - /* Allocate physical memory if needed */ - if (mapping->physmem_base == 0) { - pa_base = vm_alloc_pageframe(1); - mapping->physmem_base = pa_base; - } else { - pa_base = mapping->physmem_base; - } - - td = this_td(); - s = vm_map_create(td->addrsp, va, pa_base, access_type, granule); - return s; -} - -int -vm_fault(vaddr_t va, vm_prot_t access_type) -{ - struct vm_mapping *mapping; - struct vm_object *vmobj; - - int s = 0; - size_t granule = vm_get_page_size(); - vaddr_t va_base = va & ~(granule - 1); - - mapping = vm_find_mapping(va_base); - if (mapping == NULL) - return -1; - - if ((vmobj = mapping->vmobj) == NULL) - /* Virtual memory object non-existent */ - return -1; - if ((access_type & ~mapping->prot) != 0) - /* Invalid access type */ - return -1; - - vm_object_ref(vmobj); - - /* Can we perform demand paging? */ - if (vmobj->demand) { - s = vm_demand_page(mapping, va_base, access_type); - if (s != 0) - goto done; - } - -done: - /* Drop the vmobj ref */ - vm_object_unref(vmobj); - return s; -} |