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| -rw-r--r-- | sys/sys/cpu.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/sys/sys/cpu.h b/sys/sys/cpu.h new file mode 100644 index 0000000..f737768 --- /dev/null +++ b/sys/sys/cpu.h @@ -0,0 +1,121 @@ +/*- + * Copyright (c) 2005 Nate Lawson (SDG) + * 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. + * + * $FreeBSD$ + */ + +#ifndef _SYS_CPU_H_ +#define _SYS_CPU_H_ + +/* + * CPU device support. + */ + +#define CPU_IVAR_PCPU 1 + +static __inline struct pcpu *cpu_get_pcpu(device_t dev) +{ + uintptr_t v = 0; + BUS_READ_IVAR(device_get_parent(dev), dev, CPU_IVAR_PCPU, &v); + return ((struct pcpu *)v); +} + +/* + * CPU frequency control interface. + */ + +/* Each driver's CPU frequency setting is exported in this format. */ +struct cf_setting { + int freq; /* Processor clock in Mhz or percent (in 100ths.) */ + int volts; /* Voltage in mV. */ + int power; /* Power consumed in mW. */ + int lat; /* Transition latency in us. */ + device_t dev; /* Driver providing this setting. */ +}; + +/* Maximum number of settings a given driver can have. */ +#define MAX_SETTINGS 24 + +/* A combination of settings is a level. */ +struct cf_level { + struct cf_setting total_set; + struct cf_setting abs_set; + struct cf_setting rel_set[MAX_SETTINGS]; + int rel_count; + TAILQ_ENTRY(cf_level) link; +}; + +TAILQ_HEAD(cf_level_lst, cf_level); + +/* Drivers should set all unknown values to this. */ +#define CPUFREQ_VAL_UNKNOWN (-1) + +/* + * Every driver offers a type of CPU control. Absolute levels are mutually + * exclusive while relative levels modify the current absolute level. There + * may be multiple absolute and relative drivers available on a given + * system. + * + * For example, consider a system with two absolute drivers that provide + * frequency settings of 100, 200 and 300, 400 and a relative driver that + * provides settings of 50%, 100%. The cpufreq core would export frequency + * levels of 50, 100, 150, 200, 300, 400. + */ +#define CPUFREQ_TYPE_RELATIVE (1<<0) +#define CPUFREQ_TYPE_ABSOLUTE (1<<1) + +/* + * When setting a level, the caller indicates the priority of this request. + * Priorities determine, among other things, whether a level can be + * overridden by other callers. For example, if the user sets a level but + * the system thermal driver needs to override it for emergency cooling, + * the driver would use a higher priority. Once the event has passed, the + * driver would call cpufreq to resume any previous level. + */ +#define CPUFREQ_PRIO_HIGHEST 1000000 +#define CPUFREQ_PRIO_KERN 1000 +#define CPUFREQ_PRIO_USER 100 +#define CPUFREQ_PRIO_LOWEST 0 + +/* + * Register and unregister a driver with the cpufreq core. Once a driver + * is registered, it must support calls to its CPUFREQ_GET, CPUFREQ_GET_LEVEL, + * and CPUFREQ_SET methods. It must also unregister before returning from + * its DEVICE_DETACH method. + */ +int cpufreq_register(device_t dev); +int cpufreq_unregister(device_t dev); + +/* Allow values to be +/- a bit since sometimes we have to estimate. */ +#define CPUFREQ_CMP(x, y) (abs((x) - (y)) < 25) + +/* + * Machine-dependent functions. + */ + +/* Estimate the current clock rate for the given CPU id. */ +int cpu_est_clockrate(int cpu_id, uint64_t *rate); + +#endif /* !_SYS_CPU_H_ */ |
