kernel: ahci: Add initial skeleton

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

1 files changed, 66 insertions, 0 deletions

diff --git a/sys/dev/ic/ahci.c b/sys/dev/ic/ahci.c
new file mode 100644
index 0000000..d3d303b
--- /dev/null
+++ b/sys/dev/ic/ahci.c
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2023-2025 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/driver.h>
+#include <sys/errno.h>
+#include <sys/syslog.h>
+#include <dev/pci/pci.h>
+
+#define pr_trace(fmt, ...) kprintf("ahci: " fmt, ##__VA_ARGS__)
+#define pr_error(...) pr_trace(__VA_ARGS__)
+
+static struct pci_device *ahci_dev;
+
+static int
+ahci_init(void)
+{
+    struct pci_lookup lookup;
+
+    lookup.pci_class = 0x01;
+    lookup.pci_subclass = 0x06;
+
+    ahci_dev = pci_get_device(lookup, PCI_CLASS | PCI_SUBCLASS);
+    if (ahci_dev == NULL) {
+        return -ENODEV;
+    }
+
+    /*
+     * The AHCI Host Bus Adapter (HBA) connects SATA
+     * devices to the PCI bus, acting as an interface
+     * between them.
+     */
+    pr_trace("Detected AHCI HBA (%x:%x.%x, slot=%d)\n",
+        ahci_dev->bus, ahci_dev->device_id, ahci_dev->func,
+        ahci_dev->slot);
+
+    return 0;
+}
+
+DRIVER_EXPORT(ahci_init);