kernel/amd64: isa: Add i8042 keyboard support

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

1 files changed, 88 insertions, 0 deletions

diff --git a/sys/include/arch/amd64/isa/i8042var.h b/sys/include/arch/amd64/isa/i8042var.h
new file mode 100644
index 0000000..ebd96ad
--- /dev/null
+++ b/sys/include/arch/amd64/isa/i8042var.h
@@ -0,0 +1,88 @@
+/*
+ * 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.
+ */
+
+#ifndef _I8042VAR_H_
+#define _I8042VAR_H_
+
+#include <sys/param.h>
+
+/* I/O bus ports */
+#define I8042_CMD       0x64
+#define I8042_DATA      0x60
+#define I8042_STATUS    0x64
+
+#define KB_IRQ      1       /* Keyboard IRQ */
+#define I8042_DELAY 20      /* Poll delay (in ms) */
+
+/* i8042 status */
+#define I8042_OBUFF BIT(0)  /* Output buffer full */
+#define I8042_IBUFF BIT(1)  /* Input buffer full */
+#define I8042_TTO   BIT(5)  /* Transmit timeout */
+#define I8042_RTO   BIT(6)  /* Receive timeout */
+#define I8042_PAR   BIT(7)  /* Parity error */
+
+/* i8042 commands */
+#define I8042_SELF_TEST     0xAA
+#define I8042_DISABLE_PORT0 0xAD
+#define I8042_DISABLE_PORT1 0xA7
+#define I8042_ENABLE_PORT0  0xAE
+#define I8042_ENABLE_PORT1  0xA8
+#define I8042_GET_CONFB     0x20
+#define I8042_SET_CONFB     0x60
+#define I8042_PORT1_SEND    0xD4
+
+/* i8042 config bits */
+#define I8042_PORT0_INTR    BIT(0)
+#define I8042_PORT1_INTR    BIT(1)
+#define I8042_PORT0_CLK     BIT(4)
+#define I8042_PORT1_CLK     BIT(5)
+
+/* Aux commands */
+#define I8042_AUX_DEFAULTS 0xF5
+#define I8042_AUX_ENABLE   0xF4
+#define I8042_AUX_DISABLE  0xF5
+#define I8042_AUX_RESET    0xFF
+
+/* LED bits */
+#define I8042_LED_SCROLL    BIT(0)
+#define I8042_LED_NUM       BIT(1)
+#define I8042_LED_CAPS      BIT(2)
+
+/* Quirks */
+#define I8042_HOSTILE       BIT(0)      /* If EC likes throwing NMIs */
+
+/* Apply a quirk to i8042 */
+void i8042_quirk(int mask);
+
+/* Internal - do not use */
+void i8042_sync(void);
+void i8042_kb_isr(void);
+void i8042_kb_event(void);
+
+#endif  /* _I8042VAR_H_ */