diff options
Diffstat (limited to 'sys/vm')
| -rw-r--r-- | sys/vm/vm_obj.c | 61 | ||||
| -rw-r--r-- | sys/vm/vm_pager.c | 47 | ||||
| -rw-r--r-- | sys/vm/vm_vnode.c | 112 |
3 files changed, 220 insertions, 0 deletions
diff --git a/sys/vm/vm_obj.c b/sys/vm/vm_obj.c new file mode 100644 index 0000000..c5fc921 --- /dev/null +++ b/sys/vm/vm_obj.c @@ -0,0 +1,61 @@ +/* + * 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 <vm/obj.h> +#include <vm/dynalloc.h> +#include <sys/errno.h> +#include <string.h> + +int +vm_obj_init(struct vm_object **res, struct vnode *vnode) +{ + struct vm_object *obj = dynalloc(sizeof(struct vm_object)); + + if (obj == NULL) { + return -ENOMEM; + } + + memset(obj, 0, sizeof(struct vm_object)); + obj->vnode = vnode; + obj->pgops = &g_vnode_pagerops; + *res = obj; + return 0; +} + +int +vm_obj_destroy(struct vm_object *obj) +{ + struct vnode *vp = obj->vnode; + + if (vp->vmobj != NULL) + vp->vmobj = NULL; + + dynfree(obj); + return 0; +} diff --git a/sys/vm/vm_pager.c b/sys/vm/vm_pager.c new file mode 100644 index 0000000..b82a9e1 --- /dev/null +++ b/sys/vm/vm_pager.c @@ -0,0 +1,47 @@ +/* + * 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 <vm/pager.h> +#include <vm/obj.h> +#include <sys/types.h> + +/* + * Get pages from backing store. + */ +int +vm_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg) +{ + struct vm_pagerops *pgops = obj->pgops; + + if (obj->is_anon) { + return -1; + } + + return pgops->get(obj, off, len, pg); +} diff --git a/sys/vm/vm_vnode.c b/sys/vm/vm_vnode.c new file mode 100644 index 0000000..707f7b4 --- /dev/null +++ b/sys/vm/vm_vnode.c @@ -0,0 +1,112 @@ +/* + * 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/errno.h> +#include <sys/sio.h> +#include <sys/vfs.h> +#include <sys/cdefs.h> +#include <vm/obj.h> +#include <vm/vm.h> +#include <vm/pager.h> + +static int vn_pager_get(struct vm_object *obj, off_t off, size_t len, + struct vm_page *pg); + +static int vn_pager_store(struct vm_object *obj, off_t off, size_t len, + struct vm_page *pg); + +/* Pager operations */ +struct vm_pagerops g_vnode_pagerops = { + .get = vn_pager_get, + .store = vn_pager_store +}; + +static inline void +vn_prep_sio(struct sio_txn *sio, char *pg, off_t off, size_t len) +{ + sio->len = __ALIGN_DOWN(len, vm_get_page_size()); + sio->buf = pg; + sio->offset = off; + sio->len = len; +} + +static int +vn_pager_io(struct vm_object *obj, off_t off, size_t len, + struct vm_page *pg, bool out) +{ + struct sio_txn sio; + struct vnode *vp; + ssize_t paged_bytes; + char *dest; + int res = 0; + + if (obj == NULL || pg == NULL) { + return -EIO; + } + + spinlock_acquire(&obj->lock); + dest = PHYS_TO_VIRT(pg->physaddr); + + /* Attempt to fetch the vnode */ + if ((vp = obj->vnode) == NULL) { + res = -EIO; + goto done; + } + + /* Prepare the SIO transaction */ + vn_prep_sio(&sio, dest, off, len); + if (sio.len == 0) { + res = -EIO; + goto done; + } + + /* Perform I/O on the backing store */ + paged_bytes = out ? vfs_write(vp, &sio) : vfs_read(vp, &sio); + if (paged_bytes < 0) { + /* Failure */ + res = paged_bytes; + goto done; + } +done: + spinlock_release(&obj->lock); + return res; +} + +static int +vn_pager_store(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg) +{ + return vn_pager_io(obj, off, len, pg, true); +} + +static int +vn_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg) +{ + return vn_pager_io(obj, off, len, pg, false); +} |