From f031ad404e544c9332498a11d9956b27a4acc72b Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Tue, 9 Jul 2024 01:36:59 -0400
Subject: kernel: Add PCI driver
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sys/arch/amd64/pci/pci_machdep.c | 63 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 63 insertions(+)
create mode 100644 sys/arch/amd64/pci/pci_machdep.c
(limited to 'sys/arch/amd64')
diff --git a/sys/arch/amd64/pci/pci_machdep.c b/sys/arch/amd64/pci/pci_machdep.c
new file mode 100644
index 0000000..fa6e492
--- /dev/null
+++ b/sys/arch/amd64/pci/pci_machdep.c
@@ -0,0 +1,63 @@
+/*
+ * 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/types.h>
+#include <sys/param.h>
+#include <dev/pci/pci.h>
+#include <machine/pio.h>
+
+static inline uint32_t
+pci_conf_addr(struct pci_device *dev, uint32_t offset)
+{
+ return BIT(31) |
+ (offset & ~3) |
+ (dev->func << 8) |
+ (dev->slot << 11) |
+ (dev->bus << 16);
+}
+
+pcireg_t
+pci_readl(struct pci_device *dev, uint32_t offset)
+{
+ uint32_t address;
+
+ address = pci_conf_addr(dev, offset);
+ outl(0xCF8, address);
+ return inl(0xCFC) >> ((offset & 3) * 8);
+}
+
+void
+pci_writel(struct pci_device *dev, uint32_t offset, pcireg_t val)
+{
+ uint32_t address;
+
+ address = pci_conf_addr(dev, offset);
+ outl(0xCF8, address);
+ outl(0xCFC, val);
+}
--
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