kernel: procfs: Add support for /proc/interrupts

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

1 files changed, 122 insertions, 0 deletions

diff --git a/sys/kern/kern_intr.c b/sys/kern/kern_intr.c
new file mode 100644
index 0000000..bed59e2
--- /dev/null
+++ b/sys/kern/kern_intr.c
@@ -0,0 +1,122 @@
+/*
+ * 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/intr.h>
+#include <sys/queue.h>
+#include <sys/mutex.h>
+#include <vm/dynalloc.h>
+#include <fs/procfs.h>
+#include <sys/panic.h>
+#include <string.h>
+#include <assert.h>
+
+#define PROC_BUF_SIZE 4096
+
+static TAILQ_HEAD(, intr_info) intrlist;
+static struct mutex intrlist_lock = {0};
+static struct proc_entry *proc;
+
+static int
+proc_read(struct proc_entry *entry, struct sio_txn *sio)
+{
+    struct intr_info *info;
+    char buf[PROC_BUF_SIZE];
+    char *p = &buf[0];
+    size_t idx = 0, len;
+    int res;
+
+    mutex_acquire(&intrlist_lock);
+    TAILQ_FOREACH(info, &intrlist, link) {
+        __assert((sizeof(buf) - idx) > 0);
+        res = snprintf(p, sizeof(buf) - idx,
+                "CPU%d\t\t%d\t\t%s\t\t%s\n",
+                info->affinity,
+                info->count,
+                info->source,
+                info->device
+        );
+
+        if (res > 0) {
+            idx += res;
+            p += res;
+        }
+    }
+
+    len = strlen(buf);
+    if (sio->len > PROC_BUF_SIZE)
+        sio->len = PROC_BUF_SIZE;
+    if (len > sio->len)
+        len = sio->len;
+
+    memcpy(sio->buf, buf, len);
+    mutex_release(&intrlist_lock);
+    return sio->len;
+}
+
+/*
+ * Register an interrupt stat
+ *
+ * @source: Source of interrupt (e.g IOAPIC)
+ * @dev: Device (e.g i8042)
+ */
+struct intr_info *
+intr_info_alloc(const char *source, const char *dev)
+{
+    struct intr_info *intr;
+
+    intr = dynalloc(sizeof(*intr));
+    if (intr == NULL)
+        return NULL;
+
+    memset(intr, 0, sizeof(*intr));
+    intr->source = source;
+    intr->device = dev;
+    return intr;
+}
+
+void
+intr_register(struct intr_info *info)
+{
+    if (info == NULL)
+        return;
+
+    TAILQ_INSERT_TAIL(&intrlist, info, link);
+}
+
+void
+intr_init_proc(void)
+{
+    /* Init the interrupt list */
+    TAILQ_INIT(&intrlist);
+
+    /* Setup /proc/interrupts */
+    proc = procfs_alloc_entry();
+    proc->read = proc_read;
+    procfs_add_entry("interrupts", proc);
+}