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authorIan Moffett <ian@osmora.org>2024-06-06 15:12:32 -0400
committerIan Moffett <ian@osmora.org>2024-06-06 15:12:32 -0400
commitb24d9a83b20a7cae49af41031a8e54946f7d42b6 (patch)
tree07d3853318546cf923db5a9df41c3da9eb790b85 /sys/include/arch/amd64
parentfbb0bcffc19e2b0ff26cfb6d85e0ee2719cc9c88 (diff)
kernel/amd64: isa: Add i8254 driver
Signed-off-by: Ian Moffett <ian@osmora.org>
Diffstat (limited to 'sys/include/arch/amd64')
-rw-r--r--sys/include/arch/amd64/isa/i8254.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/sys/include/arch/amd64/isa/i8254.h b/sys/include/arch/amd64/isa/i8254.h
new file mode 100644
index 0000000..1463d71
--- /dev/null
+++ b/sys/include/arch/amd64/isa/i8254.h
@@ -0,0 +1,44 @@
+/*
+ * 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.
+ */
+
+#ifndef _MACHINE_ISA_I8254_H_
+#define _MACHINE_ISA_I8254_H_
+
+#include <sys/types.h>
+
+#define I8254_COMMAND 0x43
+#define I8254_CHANNEL_0 0x40
+#define I8254_CHANNEL_2 0x42
+#define I8254_DIVIDEND 1193182ULL
+
+uint16_t i8254_get_count(void);
+void i8254_set_reload(uint16_t val);
+void i8254_set_frequency(uint64_t frequency_hz);
+
+#endif /* !_MACHINE_ISA_I8254_H_ */