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-rw-r--r--sys/arch/amd64/amd64/hpet.c186
-rw-r--r--sys/dev/acpi/acpi_init.c11
-rw-r--r--sys/include/arch/amd64/hpet.h37
3 files changed, 234 insertions, 0 deletions
diff --git a/sys/arch/amd64/amd64/hpet.c b/sys/arch/amd64/amd64/hpet.c
new file mode 100644
index 0000000..860e610
--- /dev/null
+++ b/sys/arch/amd64/amd64/hpet.c
@@ -0,0 +1,186 @@
+/*
+ * 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/mmio.h>
+#include <sys/syslog.h>
+#include <machine/hpet.h>
+#include <dev/acpi/acpi.h>
+#include <dev/acpi/tables.h>
+#include <dev/timer.h>
+
+#define pr_trace(fmt, ...) kprintf("hpet: " fmt, ##__VA_ARGS__)
+#define pr_error(fmt, ...) pr_trace(__VA_ARGS__)
+
+#define HPET_REG_CAPS 0x00
+#define HPET_GENERAL_CONFIG 0x10
+#define HPET_REG_MAIN_COUNTER 0xF0
+
+#define CAP_REV_ID(caps) (caps & 0xFF)
+#define CAP_NUM_TIM(caps) (caps >> 8) & 0x1F
+#define CAP_CLK_PERIOD(caps) (caps >> 32)
+
+#define FSEC_PER_SECOND 1000000000000000ULL
+#define USEC_PER_SECOND 1000000ULL
+
+static void *hpet_base = NULL;
+static struct timer timer = {0};
+
+/*
+ * Read from HPET register space.
+ *
+ * @reg: Register to read from.
+ */
+static inline uint64_t
+hpet_read(uint32_t reg)
+{
+ void *addr;
+
+ addr = (void *)((uintptr_t)hpet_base + reg);
+ return mmio_read64(addr);
+}
+
+/*
+ * Write to HPET register space.
+ *
+ * @reg: Register to write to.
+ * @val: Value to write.
+ */
+static inline void
+hpet_write(uint32_t reg, uint64_t val)
+{
+ void *addr;
+
+ addr = (void *)((uintptr_t)hpet_base + reg);
+ mmio_write64(addr, val);
+}
+
+static int
+hpet_sleep(uint64_t n, uint64_t units)
+{
+ uint64_t caps;
+ uint32_t period;
+ uint64_t counter_val;
+ volatile size_t ticks;
+
+ caps = hpet_read(HPET_REG_CAPS);
+ period = CAP_CLK_PERIOD(caps);
+ counter_val = hpet_read(HPET_REG_MAIN_COUNTER);
+
+ ticks = counter_val + (n * (units / period));
+
+ while (hpet_read(HPET_REG_MAIN_COUNTER) < ticks) {
+ __ASMV("rep; nop");
+ }
+
+ return 0;
+}
+
+static int
+hpet_msleep(size_t ms)
+{
+ return hpet_sleep(ms, 1000000000000);
+}
+
+static int
+hpet_usleep(size_t us)
+{
+ return hpet_sleep(us, 1000000000);
+}
+
+static int
+hpet_nsleep(size_t ns)
+{
+ return hpet_sleep(ns, 1000000);
+}
+
+static size_t
+hpet_time_usec(void)
+{
+ uint64_t period, freq, caps;
+ uint64_t counter;
+
+ caps = hpet_read(HPET_REG_CAPS);
+ period = CAP_CLK_PERIOD(caps);
+ freq = FSEC_PER_SECOND / period;
+
+ counter = hpet_read(HPET_REG_MAIN_COUNTER);
+ return (counter * USEC_PER_SECOND) / freq;
+}
+
+static size_t
+hpet_time_sec(void)
+{
+ return hpet_time_usec() / USEC_PER_SECOND;
+}
+
+int
+hpet_init(void)
+{
+ struct acpi_gas *gas;
+ struct acpi_hpet *hpet;
+ uint64_t caps;
+
+ hpet = acpi_query("HPET");
+ if (hpet == NULL)
+ return -1;
+
+ gas = &hpet->gas;
+ hpet_base = (void *)gas->address;
+
+ /* Ensure caps aren't bogus */
+ caps = hpet_read(HPET_REG_CAPS);
+ if (CAP_REV_ID(caps) == 0) {
+ pr_error("Found bogus revision, assuming faulty\n");
+ return -1;
+ }
+ if (CAP_CLK_PERIOD(caps) > 0x05F5E100) {
+ /*
+ * The spec states this counter clk period must
+ * be <= 0x05F5E100. So we'll consider it as bogus
+ * if it exceeds this value
+ */
+ pr_error("Found bogus COUNTER_CLK_PERIOD, assuming faulty\n");
+ return 1;
+ }
+
+ pr_trace("HPET integrity verified\n");
+ hpet_write(HPET_REG_MAIN_COUNTER, 0);
+ hpet_write(HPET_GENERAL_CONFIG, 1);
+
+ /* Setup timer descriptor */
+ timer.name = "HIGH_PRECISION_EVENT_TIMER";
+ timer.msleep = hpet_msleep;
+ timer.usleep = hpet_usleep;
+ timer.nsleep = hpet_nsleep;
+ timer.get_time_usec = hpet_time_usec;
+ timer.get_time_sec = hpet_time_sec;
+ register_timer(TIMER_GP, &timer);
+ return 0;
+}
diff --git a/sys/dev/acpi/acpi_init.c b/sys/dev/acpi/acpi_init.c
index a8423e4..f445d95 100644
--- a/sys/dev/acpi/acpi_init.c
+++ b/sys/dev/acpi/acpi_init.c
@@ -48,6 +48,16 @@ static volatile struct limine_rsdp_request rsdp_req = {
.revision = 0
};
+static void
+acpi_init_hpet(void)
+{
+#if defined(__x86_64__)
+ if (hpet_init() != 0) {
+ panic("Could not init HPET\n");
+ }
+#endif
+}
+
/*
* Writes out OEMID of ACPI header.
*
@@ -107,4 +117,5 @@ acpi_init(void)
}
root_sdt_entries = (root_sdt->hdr.length - sizeof(root_sdt->hdr)) / 4;
+ acpi_init_hpet();
}
diff --git a/sys/include/arch/amd64/hpet.h b/sys/include/arch/amd64/hpet.h
new file mode 100644
index 0000000..0ebc96b
--- /dev/null
+++ b/sys/include/arch/amd64/hpet.h
@@ -0,0 +1,37 @@
+/*
+ * 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_HPET_H_
+#define _MACHINE_HPET_H_
+
+#include <sys/types.h>
+
+int hpet_init(void);
+
+#endif /* !_MACHINE_HPET_H_ */
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