kernel: fs: Add procfs support

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/sys/fs/procfs_subr.c b/sys/fs/procfs_subr.c
new file mode 100644
index 0000000..e368d56
--- /dev/null
+++ b/sys/fs/procfs_subr.c
@@ -0,0 +1,109 @@
+/*
+ * 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/panic.h>
+#include <machine/cpu.h>
+#include <fs/procfs.h>
+#include <vm/vm.h>
+#include <string.h>
+
+static bool populated = false;
+
+static int
+procfs_ver_read(struct proc_entry *p, struct sio_txn *sio)
+{
+    char buf[1024];
+    size_t len;
+
+    len = snprintf(buf, sizeof(buf), "Hyra/%s v%s: %s (%s)",
+                   HYRA_ARCH, HYRA_VERSION,
+                   HYRA_BUILDDATE, HYRA_BUILDBRANCH);
+
+    /* Truncate if needed */
+    if (len > sio->len)
+        len = sio->len;
+
+    memcpy(sio->buf, buf, len);
+    return len;
+}
+
+static int
+procfs_memstat_read(struct proc_entry *p, struct sio_txn *sio)
+{
+    struct vm_memstat stat;
+    struct physmem_stat *pstat;
+    char buf[1024];
+    size_t len;
+
+    stat = vm_memstat();
+    pstat = &stat.pmem_stat;
+    len = snprintf(buf, sizeof(buf),
+                   "TotalMem:      %d KiB\n"
+                   "ReservedMem:   %d KiB\n"
+                   "AvailableMem:  %d KiB\n"
+                   "AllocatedMem:  %d KiB\n"
+                   "VMemObjCount:  %d",
+                   pstat->total_kib,
+                   pstat->reserved_kib,
+                   pstat->avl_kib,
+                   pstat->alloc_kib,
+                   stat.vmobj_cnt);
+
+    /* Truncate if needed */
+    if (len > sio->len)
+        len = sio->len;
+
+    memcpy(sio->buf, buf, len);
+    return len;
+}
+
+/*
+ * Populate procfs with basic misc entries
+ */
+void
+procfs_populate(void)
+{
+    struct proc_entry *version;
+    struct proc_entry *memstat;
+
+    if (populated)
+        return;
+
+    populated = true;
+
+    /* Kernel version */
+    version = procfs_alloc_entry();
+    version->read = procfs_ver_read;
+    procfs_add_entry("version", version);
+
+    /* Memstat */
+    memstat = procfs_alloc_entry();
+    memstat->read = procfs_memstat_read;
+    procfs_add_entry("memstat", memstat);
+}