diff options
author | markm <markm@FreeBSD.org> | 2004-08-01 11:40:54 +0000 |
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committer | markm <markm@FreeBSD.org> | 2004-08-01 11:40:54 +0000 |
commit | a6c822020d368106b01f399673116ff8716835c7 (patch) | |
tree | 6d7271eea5bb8ced5f0b1cdd585641f60f5622e5 /sys/dev/mem/memdev.c | |
parent | d879bd3de14d88aabd818b50f6e9341d3008ae95 (diff) | |
download | FreeBSD-src-a6c822020d368106b01f399673116ff8716835c7.zip FreeBSD-src-a6c822020d368106b01f399673116ff8716835c7.tar.gz |
Break out the MI part of the /dev/[k]mem and /dev/io drivers into
their own directory and module, leaving the MD parts in the MD
area (the MD parts _are_ part of the modules). /dev/mem and /dev/io
are now loadable modules, thus taking us one step further towards
a kernel created entirely out of modules. Of course, there is nothing
preventing the kernel from having these statically compiled.
Diffstat (limited to 'sys/dev/mem/memdev.c')
-rw-r--r-- | sys/dev/mem/memdev.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/sys/dev/mem/memdev.c b/sys/dev/mem/memdev.c new file mode 100644 index 0000000..290259a --- /dev/null +++ b/sys/dev/mem/memdev.c @@ -0,0 +1,108 @@ +/*- + * Copyright (c) 2004 Mark R V Murray + * 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 + * in this position and unchanged. + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``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 AUTHOR 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/conf.h> +#include <sys/fcntl.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/memrange.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/proc.h> +#include <sys/signalvar.h> +#include <sys/systm.h> +#include <sys/uio.h> + +#include <vm/vm.h> +#include <vm/pmap.h> + +#include <machine/memdev.h> + +static struct cdev *memdev, *kmemdev; + +static struct cdevsw mem_cdevsw = { + .d_version = D_VERSION, + .d_flags = D_MEM|D_NEEDGIANT, + .d_open = memopen, + .d_read = memrw, + .d_write = memrw, + .d_ioctl = memioctl, + .d_mmap = memmmap, + .d_name = "mem", +}; + +/* ARGSUSED */ +int +memopen(struct cdev *dev __unused, int flags, int fmt __unused, + struct thread *td) +{ + int error = 0; + + if (flags & FWRITE) + error = securelevel_gt(td->td_ucred, 0); + + return (error); +} + +/* ARGSUSED */ +static int +mem_modevent(module_t mod __unused, int type, void *data __unused) +{ + switch(type) { + case MOD_LOAD: + if (bootverbose) + printf("mem: <memory>\n"); + dev_mem_md_init(); /* Machine dependant bit */ + memdev = make_dev(&mem_cdevsw, CDEV_MINOR_MEM, + UID_ROOT, GID_KMEM, 0640, "mem"); + kmemdev = make_dev(&mem_cdevsw, CDEV_MINOR_KMEM, + UID_ROOT, GID_KMEM, 0640, "kmem"); + break; + + case MOD_UNLOAD: + destroy_dev(memdev); + destroy_dev(kmemdev); + break; + + case MOD_SHUTDOWN: + break; + + default: + return(EOPNOTSUPP); + break; + + } + + return (0); +} + +DEV_MODULE(mem, mem_modevent, NULL); |