diff options
Diffstat (limited to 'sys/dev')
| -rw-r--r-- | sys/dev/timer/hpet.c | 193 |
1 files changed, 0 insertions, 193 deletions
diff --git a/sys/dev/timer/hpet.c b/sys/dev/timer/hpet.c deleted file mode 100644 index b836205..0000000 --- a/sys/dev/timer/hpet.c +++ /dev/null @@ -1,193 +0,0 @@ -/* - * 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 <dev/timer/hpet.h> -#include <firmware/acpi/acpi.h> -#include <sys/panic.h> -#include <sys/cdefs.h> -#include <sys/timer.h> -#include <sys/errno.h> -#include <sys/syslog.h> -#include <sys/mmio.h> - -__MODULE_NAME("hpet"); -__KERNEL_META("$Hyra$: hpet.c, Ian Marco Moffett, " - "HPET driver"); - -#define HPET_REG_CAPS 0x00 -#define HPET_GENERAL_CONFIG 0x10 -#define HPET_REG_MAIN_COUNTER 0xF0 - -#define CAP_REV_ID(caps) __SHIFTOUT(caps, 0xFF) -#define CAP_NUM_TIM(caps) __SHIFTOUT(caps, 0x1F << 8) -#define CAP_COUNT_SIZE(caps) __SHIFTOUT(caps, __BIT(13)) -#define CAP_VENDOR_ID(caps) __SHIFTOUT(caps, 0xFFFF << 16) -#define CAP_CLK_PERIOD(caps) (caps >> 32) - -/* - * TODO: Use some sort of helper function that - * uses PAUSE or some similar instruction - * for the current architecture. It is - * *not* a good idea to spin for a prolonged - * amount of time without it. For now we'll - * just use PAUSE on x86_64 like this. - */ -#if defined(__x86_64__) -#define spinwait_hint() __ASMV("pause") -#else -#define spinwait_hint() __nothing -#endif /* defined(__x86_64__) */ - -static struct timer timer = { 0 }; -static struct hpet *acpi_hpet = NULL; -static void *hpet_base = NULL; -static bool is_faulty = false; - -/* - * 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; - - /* Don't even try if faulty, would probably cause deadlock */ - if (is_faulty) { - return EXIT_FAILURE; - } - - 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) { - spinwait_hint(); - } - - return EXIT_SUCCESS; -} - -int -hpet_msleep(size_t ms) -{ - return hpet_sleep(ms, 1000000000000); -} - -int -hpet_usleep(size_t us) -{ - return hpet_sleep(us, 1000000000); -} - -int -hpet_nsleep(size_t ns) -{ - return hpet_sleep(ns, 1000000); -} - -int -hpet_init(void) -{ - struct acpi_gas *gas; - uint64_t caps; - - acpi_hpet = acpi_query("HPET"); - if (acpi_hpet == NULL) - return 1; /* Not found */ - - gas = &acpi_hpet->gas; - hpet_base = (void *)gas->address; - caps = hpet_read(HPET_REG_CAPS); - - /* Ensure caps aren't bogus */ - if (CAP_REV_ID(caps) == 0) { - KERR("Found bogus revision, assuming faulty\n"); - is_faulty = true; - 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 - */ - KERR("Found bogus COUNTER_CLK_PERIOD, assuming faulty\n"); - KINFO("HPET REV - 0x%x\n", CAP_REV_ID(caps)); - KINFO("COUNTER_CLK_PERIOD - 0x%x\n", CAP_CLK_PERIOD(caps)); - is_faulty = true; - return 1; - } - - KINFO("HPET integrity verified\n"); - - hpet_write(HPET_REG_MAIN_COUNTER, 0); - hpet_write(HPET_GENERAL_CONFIG, 1); - - /* Setup the timer descriptor */ - timer.name = "HIGH_PRECISION_EVENT_TIMER"; - timer.msleep = hpet_msleep; - timer.usleep = hpet_usleep; - timer.nsleep = hpet_nsleep; - register_timer(TIMER_GP, &timer); - - /* Not faulty */ - is_faulty = false; - return 0; -} |