From 2003325ba7b913425fe805ace0039bc9d0401633 Mon Sep 17 00:00:00 2001
From: sigsegv7 <ian@vegaa.systems>
Date: Fri, 15 Sep 2023 23:03:11 -0400
Subject: kernel: dev: Add HPET driver

Signed-off-by: sigsegv7 <ian@vegaa.systems>
---
 sys/include/dev/timer/hpet.h       | 38 ++++++++++++++++++++++++++++++++++++++
 sys/include/firmware/acpi/tables.h | 26 ++++++++++++++++++++++++--
 2 files changed, 62 insertions(+), 2 deletions(-)
 create mode 100644 sys/include/dev/timer/hpet.h

(limited to 'sys/include')

diff --git a/sys/include/dev/timer/hpet.h b/sys/include/dev/timer/hpet.h
new file mode 100644
index 0000000..513444e
--- /dev/null
+++ b/sys/include/dev/timer/hpet.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2023 Ian Marco Moffett and the VegaOS 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 VegaOS 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 _TIMER_HPET_H_
+#define _TIMER_HPET_H_
+
+#include <sys/types.h>
+
+int hpet_init(void);
+void hpet_msleep(size_t ms);
+
+#endif  /* !_TIMER_HPET_H_ */
diff --git a/sys/include/firmware/acpi/tables.h b/sys/include/firmware/acpi/tables.h
index c145e90..2d65f46 100644
--- a/sys/include/firmware/acpi/tables.h
+++ b/sys/include/firmware/acpi/tables.h
@@ -51,7 +51,7 @@ struct __packed acpi_rsdp {
     uint64_t signature;         /* RSD PTR */
     uint8_t checksum;           /* Structure checksum */
     char oemid[OEMID_SIZE];     /* OEM-supplied string that IDs the OEM */
-    uint8_t revision;           /* Revision of the structure */ 
+    uint8_t revision;           /* Revision of the structure */
     uint32_t rsdt_addr;         /* RSDT physical address */
 
     /* Reserved if revision < 2 */
@@ -61,7 +61,7 @@ struct __packed acpi_rsdp {
     uint8_t reserved[3];
 };
 
-/* 
+/*
  * XSDT or RSDT depending
  * on what revision the header
  * says.
@@ -105,4 +105,26 @@ struct __packed interrupt_override {
     uint16_t flags;
 };
 
+struct __packed acpi_gas {
+    uint8_t address_space_id;
+    uint8_t register_bit_width;
+    uint8_t register_bit_offset;
+    uint8_t reserved;
+    uint64_t address;
+};
+
+struct __packed hpet {
+    struct acpi_header hdr;
+    uint8_t hardware_rev_id;
+    uint8_t comparator_count : 5;
+    uint8_t counter_size : 1;
+    uint8_t reserved : 1;
+    uint8_t legacy_replacement : 1;
+    uint16_t pci_vendor_id;
+    struct acpi_gas gas;
+    uint8_t hpet_number;
+    uint16_t minimum_tick;
+    uint8_t page_protection;
+};
+
 #endif      /* !_ACPI_TABLES_H_ */
-- 
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