From 9d3b3b602fc20246dda2a29c0926babbf1ea7fcd Mon Sep 17 00:00:00 2001 From: Ian Moffett Date: Tue, 14 Oct 2025 21:22:56 -0400 Subject: kern: dms: Add initial DMS engine sources The DMS engine handles performing I/O based on specific opcodes given to it and drives the callback wrappers. Signed-off-by: Ian Moffett --- src/sys/dms/dms_engine.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 src/sys/dms/dms_engine.c (limited to 'src/sys/dms/dms_engine.c') diff --git a/src/sys/dms/dms_engine.c b/src/sys/dms/dms_engine.c new file mode 100644 index 0000000..35388cc --- /dev/null +++ b/src/sys/dms/dms_engine.c @@ -0,0 +1,106 @@ +/* + * Copyright (c) 2025 Ian Marco Moffett and L5 engineers + * 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 the project 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 +#include +#include +#include +#include +#include +#include + +static ssize_t +dms_io(struct dms_frame *dfp) +{ + struct dms_disk *dp; + size_t len; + ssize_t retval = -ENXIO; + int error; + void *kbuf; + + if (dfp == NULL) { + return -EINVAL; + } + + if ((len = dfp->len) == 0) { + return -EINVAL; + } + + if ((dp = dms_get(dfp->id)) == NULL) { + return -ENODEV; + } + + if ((kbuf = kalloc(dfp->len)) == NULL) { + return -ENOMEM; + } + + switch (dfp->opcode) { + case DMS_OPC_READ: + retval = dms_read(dp, kbuf, dfp->offset, dfp->len); + if (retval < 0) { + break; + } + error = copyout(kbuf, dfp->buf, dfp->len); + if (error < 0) { + retval = error; + break; + } + break; + case DMS_OPC_WRITE: + error = copyin(dfp->buf, kbuf, dfp->len); + if (error < 0) { + retval = error; + break; + } + + retval = dms_write(dp, kbuf, dfp->offset, dfp->len); + break; + } + + kfree(kbuf); + return retval; +} + +/* + * ARG0: DMS frame pointer + */ +scret_t +sys_dmsio(struct syscall_args *scargs) +{ + struct dms_frame *u_dfp = SCARG(scargs, struct dms_frame *, 0); + struct dms_frame df; + int error; + + error = copyin(u_dfp, &df, sizeof(df)); + if (error < 0) { + return error; + } + + return dms_io(&df); +} -- cgit v1.2.3