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-rw-r--r--sys/dev/ic/nvme.c1
-rw-r--r--sys/include/sys/device.h2
-rw-r--r--sys/include/vm/pager.h4
-rw-r--r--sys/vm/vm_device.c119
-rw-r--r--sys/vm/vm_obj.c19
-rw-r--r--sys/vm/vm_pager.c21
6 files changed, 165 insertions, 1 deletions
diff --git a/sys/dev/ic/nvme.c b/sys/dev/ic/nvme.c
index addfd66..f471627 100644
--- a/sys/dev/ic/nvme.c
+++ b/sys/dev/ic/nvme.c
@@ -410,6 +410,7 @@ nvme_init_ns(struct nvme_state *state, uint16_t nsid)
dev->read = nvme_dev_read;
dev->write = nvme_dev_write;
dev->blocksize = ns->lba_bsize;
+ dev->mmap = NULL;
ns->dev_id = device_create(dev, state->major, nsid);
snprintf(devname, sizeof(devname), "nvme0n%d", nsid);
diff --git a/sys/include/sys/device.h b/sys/include/sys/device.h
index 7b2f297..8695ab6 100644
--- a/sys/include/sys/device.h
+++ b/sys/include/sys/device.h
@@ -32,6 +32,7 @@
#include <sys/sio.h>
#include <sys/queue.h>
+#include <sys/types.h>
#include <vm/dynalloc.h>
#define DEVICE_ALLOC() dynalloc(sizeof(struct device))
@@ -41,6 +42,7 @@ struct device {
size_t blocksize;
int(*write)(struct device *dev, struct sio_txn *sio);
int(*read)(struct device *dev, struct sio_txn *sio);
+ paddr_t(*mmap)(struct device *dev, off_t off, vm_prot_t prot);
TAILQ_ENTRY(device) link;
};
diff --git a/sys/include/vm/pager.h b/sys/include/vm/pager.h
index 5f36bfc..e57afe1 100644
--- a/sys/include/vm/pager.h
+++ b/sys/include/vm/pager.h
@@ -38,10 +38,14 @@ struct vm_object;
struct vm_pagerops {
int(*get)(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
int(*store)(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
+ /* TODO: Remove this and add demand paging */
+ int(*get_paddr)(struct vm_object *obj, paddr_t *paddr, vm_prot_t prot);
};
extern struct vm_pagerops g_vnode_pagerops;
+extern struct vm_pagerops g_dev_pagerops;
int vm_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg);
+int vm_pager_paddr(struct vm_object *obj, paddr_t *paddr, vm_prot_t prot);
#endif /* !_VM_PAGER_H_ */
diff --git a/sys/vm/vm_device.c b/sys/vm/vm_device.c
new file mode 100644
index 0000000..976dec7
--- /dev/null
+++ b/sys/vm/vm_device.c
@@ -0,0 +1,119 @@
+/*
+ * 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 <fs/devfs.h>
+#include <vm/obj.h>
+#include <vm/vm.h>
+#include <vm/pager.h>
+
+static int dv_pager_get(struct vm_object *obj, off_t off, size_t len,
+ struct vm_page *pg);
+
+static int dv_pager_store(struct vm_object *obj, off_t off, size_t len,
+ struct vm_page *pg);
+
+static int dv_pager_paddr(struct vm_object *obj, paddr_t *paddr,
+ vm_prot_t prot);
+
+/* Pager operations */
+struct vm_pagerops g_dev_pagerops = {
+ .get = dv_pager_get,
+ .store = dv_pager_store,
+ .get_paddr = dv_pager_paddr
+};
+
+/*
+ * Fetch a device descriptor from a memory
+ * object.
+ *
+ * Returns 0 on success.
+ */
+static int
+dv_get_dev(struct vm_object *obj, struct device **res)
+{
+ struct device *dev;
+ struct vnode *vp;
+ int status;
+
+ if ((vp = obj->vnode) == NULL)
+ return -EIO;
+
+ /* Now try to fetch the device */
+ if ((status = devfs_get_dev(vp, &dev)) != 0)
+ return status;
+
+ *res = dev;
+ return 0;
+}
+
+static int
+dv_pager_paddr(struct vm_object *obj, paddr_t *paddr, vm_prot_t prot)
+{
+ struct device *dev;
+ int status;
+
+ if (paddr == NULL) {
+ return -EINVAL;
+ }
+
+ /* Try to fetch the device */
+ if ((status = dv_get_dev(obj, &dev)) != 0) {
+ return status;
+ }
+
+ if (dev->mmap == NULL) {
+ /*
+ * mmap() is not supported, this is not an object
+ * we can handle so try switching its operations
+ * to the vnode pager ops...
+ */
+ obj->pgops = &g_vnode_pagerops;
+ return -ENOTSUP;
+ }
+
+ *paddr = dev->mmap(dev, 0, prot);
+ return 0;
+}
+
+static int
+dv_pager_store(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg)
+{
+ return -1;
+}
+
+static int
+dv_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg)
+{
+ return -1;
+}
diff --git a/sys/vm/vm_obj.c b/sys/vm/vm_obj.c
index c5fc921..589ca47 100644
--- a/sys/vm/vm_obj.c
+++ b/sys/vm/vm_obj.c
@@ -32,6 +32,22 @@
#include <sys/errno.h>
#include <string.h>
+static void
+vm_set_pgops(struct vm_object *obj, struct vnode *vnode)
+{
+ if (vnode == NULL) {
+ obj->vnode = NULL;
+ return;
+ }
+
+ /* Is this a device? */
+ if (vnode->type == VCHR || vnode->type == VBLK) {
+ obj->pgops = &g_dev_pagerops;
+ } else {
+ obj->pgops = &g_vnode_pagerops;
+ }
+}
+
int
vm_obj_init(struct vm_object **res, struct vnode *vnode)
{
@@ -43,7 +59,8 @@ vm_obj_init(struct vm_object **res, struct vnode *vnode)
memset(obj, 0, sizeof(struct vm_object));
obj->vnode = vnode;
- obj->pgops = &g_vnode_pagerops;
+
+ vm_set_pgops(obj, vnode);
*res = obj;
return 0;
}
diff --git a/sys/vm/vm_pager.c b/sys/vm/vm_pager.c
index b82a9e1..0046e9c 100644
--- a/sys/vm/vm_pager.c
+++ b/sys/vm/vm_pager.c
@@ -45,3 +45,24 @@ vm_pager_get(struct vm_object *obj, off_t off, size_t len, struct vm_page *pg)
return pgops->get(obj, off, len, pg);
}
+
+/*
+ * Get physical address.
+ *
+ * TODO: Remove this and add demanding paging.
+ */
+int
+vm_pager_paddr(struct vm_object *obj, paddr_t *paddr, vm_prot_t prot)
+{
+ struct vm_pagerops *pgops = obj->pgops;
+
+ if (obj->is_anon) {
+ return -1;
+ }
+
+ if (pgops->get_paddr == NULL) {
+ return 0;
+ }
+
+ return pgops->get_paddr(obj, paddr, prot);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-23 16:14:49 +0000