xnu-4570.71.2.tar.gz

[apple/xnu.git] / osfmk / arm / machine_routines.h

/*
 * Copyright (c) 2007-2015 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * @OSF_COPYRIGHT@
 */

#ifndef	_ARM_MACHINE_ROUTINES_H_
#define	_ARM_MACHINE_ROUTINES_H_

#include <mach/mach_types.h>
#include <mach/boolean.h>
#include <kern/kern_types.h>
#include <pexpert/pexpert.h>

#include <sys/cdefs.h>
#include <sys/appleapiopts.h>

#include <stdarg.h>

__BEGIN_DECLS

/* Interrupt handling */

void ml_cpu_signal(unsigned int cpu_id);
void ml_cpu_signal_deferred_adjust_timer(uint64_t nanosecs);
uint64_t ml_cpu_signal_deferred_get_timer(void);
void ml_cpu_signal_deferred(unsigned int cpu_id);
void ml_cpu_signal_retract(unsigned int cpu_id);

/* Initialize Interrupts */
void    ml_init_interrupt(void);

/* Get Interrupts Enabled */
boolean_t ml_get_interrupts_enabled(void);

/* Set Interrupts Enabled */
boolean_t ml_set_interrupts_enabled(boolean_t enable);

/* Check if running at interrupt context */
boolean_t ml_at_interrupt_context(void);

/* Generate a fake interrupt */
void ml_cause_interrupt(void);

/* Clear interrupt spin debug state for thread */
#if INTERRUPT_MASKED_DEBUG
void ml_spin_debug_reset(thread_t thread);
void ml_spin_debug_clear(thread_t thread);
void ml_spin_debug_clear_self(void);
void ml_check_interrupts_disabled_duration(thread_t thread);
#endif

#ifdef XNU_KERNEL_PRIVATE
extern boolean_t ml_is_quiescing(void);
extern void ml_set_is_quiescing(boolean_t);
extern uint64_t ml_get_booter_memory_size(void);
#endif

/* Type for the Time Base Enable function */
typedef void (*time_base_enable_t)(cpu_id_t cpu_id, boolean_t enable);
#if MACH_KERNEL_PRIVATE
/* Type for the Processor Cache Dispatch function */
typedef void (*cache_dispatch_t)(cpu_id_t cpu_id, unsigned int select, unsigned int param0, unsigned int param1);
#endif

#define CacheConfig			0x00000000UL
#define CacheControl			0x00000001UL
#define CacheClean			0x00000002UL
#define CacheCleanRegion		0x00000003UL
#define CacheCleanFlush			0x00000004UL
#define CacheCleanFlushRegion		0x00000005UL
#define CacheShutdown			0x00000006UL

#define CacheControlEnable		0x00000000UL

#define CacheConfigCCSIDR		0x00000001UL
#define CacheConfigSize			0x00000100UL

/* Type for the Processor Idle function */
typedef void (*processor_idle_t)(cpu_id_t cpu_id, boolean_t enter, uint64_t *new_timeout_ticks);

/* Type for the Idle Tickle function */
typedef void (*idle_tickle_t)(void);

/* Type for the Idle Timer function */
typedef void (*idle_timer_t)(void *refcon, uint64_t *new_timeout_ticks);

/* Type for the IPI Hander */
typedef void (*ipi_handler_t)(void);

/* Type for the Lockdown Hander */
typedef void (*lockdown_handler_t)(void *);

/* Type for the Platform specific Error Handler */
typedef void (*platform_error_handler_t)(void *refcon, vm_offset_t fault_addr);

/*
 * The exception callback (ex_cb) module allows kernel drivers to 
 * register and receive callbacks for exceptions, and indicate 
 * actions to be taken by the platform kernel
 * Currently this is supported for ARM64 but extending support for ARM32 
 * should be straightforward
 */

/* Supported exception classes for callbacks */
typedef enum
{
	EXCB_CLASS_ILLEGAL_INSTR_SET,
	EXCB_CLASS_MAX		// this must be last
}
ex_cb_class_t;

/* Actions indicated by callbacks to be taken by platform kernel */
typedef enum
{
	EXCB_ACTION_RERUN,	// re-run the faulting instruction
	EXCB_ACTION_NONE,	// continue normal exception handling
}
ex_cb_action_t;

/* 
 * Exception state 
 * We cannot use a private kernel data structure such as arm_saved_state_t 
 * The CPSR and ESR are not clobbered when the callback function is invoked so 
 * those registers can be examined by the callback function;
 * the same is done in the platform error handlers
 */
typedef struct 
{
	vm_offset_t far;
}
ex_cb_state_t;

/* callback type definition */
typedef ex_cb_action_t (*ex_cb_t) (
	ex_cb_class_t		cb_class,
	void				*refcon,// provided at registration 
	const ex_cb_state_t	*state	// exception state
	);

/* 
 * Callback registration 
 * Currently we support only one registered callback per class but 
 * it should be possible to support more callbacks
 */
kern_return_t ex_cb_register(
	ex_cb_class_t	cb_class, 
	ex_cb_t			cb,
	void			*refcon );

/*
 * Called internally by platform kernel to invoke the registered callback for class
 */
ex_cb_action_t ex_cb_invoke(
	ex_cb_class_t	cb_class,
    vm_offset_t		far);


void ml_parse_cpu_topology(void);

unsigned int ml_get_cpu_count(void);

int ml_get_boot_cpu_number(void);

int ml_get_cpu_number(uint32_t phys_id);

int ml_get_max_cpu_number(void);

/* Struct for ml_cpu_get_info */
struct ml_cpu_info {
	unsigned long		vector_unit;
	unsigned long		cache_line_size;
	unsigned long		l1_icache_size;
	unsigned long		l1_dcache_size;
	unsigned long		l2_settings;
	unsigned long		l2_cache_size;
	unsigned long		l3_settings;
	unsigned long		l3_cache_size;
};
typedef struct ml_cpu_info ml_cpu_info_t;

typedef enum {
	CLUSTER_TYPE_SMP,
} cluster_type_t;

cluster_type_t ml_get_boot_cluster(void);

/* Struct for ml_processor_register */
struct ml_processor_info {
	cpu_id_t			cpu_id;
	vm_offset_t			start_paddr;
	boolean_t			supports_nap;
	void 				*platform_cache_dispatch;
	time_base_enable_t		time_base_enable;
	processor_idle_t		processor_idle;
	idle_tickle_t			*idle_tickle;
	idle_timer_t			idle_timer;
	void				*idle_timer_refcon;
	vm_offset_t			powergate_stub_addr;
	uint32_t			powergate_stub_length;
	uint32_t			powergate_latency;
	platform_error_handler_t	platform_error_handler;
	uint64_t			regmap_paddr;
	uint32_t			phys_id;
	uint32_t			log_id;
	uint32_t			l2_access_penalty;
	uint32_t			cluster_id;
	cluster_type_t			cluster_type;
	uint32_t			l2_cache_id;
	uint32_t			l2_cache_size;
	uint32_t			l3_cache_id;
	uint32_t			l3_cache_size;
};
typedef struct ml_processor_info ml_processor_info_t;

#if	defined(PEXPERT_KERNEL_PRIVATE) || defined(MACH_KERNEL_PRIVATE)
/* Struct for ml_init_timebase */
struct  tbd_ops {
	void		(*tbd_fiq_handler)(void);
	uint32_t	(*tbd_get_decrementer)(void);
	void 		(*tbd_set_decrementer)(uint32_t dec_value);
};
typedef struct tbd_ops        *tbd_ops_t;
typedef struct tbd_ops        tbd_ops_data_t;
#endif

/* Register a processor */                      
kern_return_t	ml_processor_register(
	ml_processor_info_t	*ml_processor_info,
	processor_t			*processor,
	ipi_handler_t		*ipi_handler);

/* Register a lockdown handler */
kern_return_t ml_lockdown_handler_register(lockdown_handler_t, void *);

#if XNU_KERNEL_PRIVATE
void ml_lockdown_init(void);

/* Check if the machine layer wants to intercept a panic call */
boolean_t ml_wants_panic_trap_to_debugger(void);

/* Machine layer routine for intercepting panics */
void ml_panic_trap_to_debugger(const char *panic_format_str,
                               va_list *panic_args,
                               unsigned int reason,
                               void *ctx,
                               uint64_t panic_options_mask,
                               unsigned long panic_caller);
#endif /* XNU_KERNEL_PRIVATE */

/* Initialize Interrupts */
void ml_install_interrupt_handler(
    void *nub,
    int source,
    void *target,
    IOInterruptHandler handler,
    void *refCon);

vm_offset_t
ml_static_vtop(
	vm_offset_t);

vm_offset_t
ml_static_ptovirt(
	vm_offset_t);

/* Offset required to obtain absolute time value from tick counter */
uint64_t ml_get_abstime_offset(void);

/* Offset required to obtain continuous time value from tick counter */
uint64_t ml_get_conttime_offset(void);

#ifdef __APPLE_API_UNSTABLE
/* PCI config cycle probing */
boolean_t ml_probe_read(
	vm_offset_t paddr,
	unsigned int *val);
boolean_t ml_probe_read_64(
	addr64_t paddr,
	unsigned int *val);

/* Read physical address byte */
unsigned int ml_phys_read_byte(
	vm_offset_t paddr);
unsigned int ml_phys_read_byte_64(
	addr64_t paddr);

/* Read physical address half word */
unsigned int ml_phys_read_half(
	vm_offset_t paddr);
unsigned int ml_phys_read_half_64(
	addr64_t paddr);

/* Read physical address word*/
unsigned int ml_phys_read(
	vm_offset_t paddr);
unsigned int ml_phys_read_64(
	addr64_t paddr);
unsigned int ml_phys_read_word(
	vm_offset_t paddr);
unsigned int ml_phys_read_word_64(
	addr64_t paddr);

unsigned long long ml_io_read(uintptr_t iovaddr, int iovsz);
unsigned int ml_io_read8(uintptr_t iovaddr);
unsigned int ml_io_read16(uintptr_t iovaddr);
unsigned int ml_io_read32(uintptr_t iovaddr);
unsigned long long ml_io_read64(uintptr_t iovaddr);

/* Read physical address double word */
unsigned long long ml_phys_read_double(
	vm_offset_t paddr);
unsigned long long ml_phys_read_double_64(
	addr64_t paddr);

/* Write physical address byte */
void ml_phys_write_byte(
	vm_offset_t paddr, unsigned int data);
void ml_phys_write_byte_64(
	addr64_t paddr, unsigned int data);

/* Write physical address half word */
void ml_phys_write_half(
	vm_offset_t paddr, unsigned int data);
void ml_phys_write_half_64(
	addr64_t paddr, unsigned int data);

/* Write physical address word */
void ml_phys_write(
	vm_offset_t paddr, unsigned int data);
void ml_phys_write_64(
	addr64_t paddr, unsigned int data);
void ml_phys_write_word(
	vm_offset_t paddr, unsigned int data);
void ml_phys_write_word_64(
	addr64_t paddr, unsigned int data);

/* Write physical address double word */
void ml_phys_write_double(
	vm_offset_t paddr, unsigned long long data);
void ml_phys_write_double_64(
	addr64_t paddr, unsigned long long data);

void ml_static_mfree(
	vm_offset_t,
	vm_size_t);

kern_return_t
ml_static_protect(
    vm_offset_t start,
    vm_size_t size,
    vm_prot_t new_prot);

/* virtual to physical on wired pages */
vm_offset_t ml_vtophys(
	vm_offset_t vaddr);

/* Get processor info */
void ml_cpu_get_info(ml_cpu_info_t *ml_cpu_info);

#endif /* __APPLE_API_UNSTABLE */

#ifdef __APPLE_API_PRIVATE
#ifdef	XNU_KERNEL_PRIVATE
vm_size_t ml_nofault_copy(
	vm_offset_t virtsrc, 
	vm_offset_t virtdst, 
	vm_size_t size);
boolean_t ml_validate_nofault(
	vm_offset_t virtsrc, vm_size_t size);
#endif /* XNU_KERNEL_PRIVATE */
#if	defined(PEXPERT_KERNEL_PRIVATE) || defined(MACH_KERNEL_PRIVATE)
/* IO memory map services */

/* Map memory map IO space */
vm_offset_t ml_io_map(
	vm_offset_t phys_addr, 
	vm_size_t size);

vm_offset_t ml_io_map_wcomb(
	vm_offset_t phys_addr, 
	vm_size_t size);

void ml_get_bouncepool_info(
	vm_offset_t *phys_addr,
	vm_size_t   *size);

vm_map_address_t ml_map_high_window(
	vm_offset_t	phys_addr,
	vm_size_t	len);

/* boot memory allocation */
vm_offset_t ml_static_malloc(
	vm_size_t size);

void ml_init_timebase(
	void		*args,
	tbd_ops_t	tbd_funcs,
	vm_offset_t	int_address,
	vm_offset_t 	int_value);

uint64_t ml_get_timebase(void);

void ml_init_lock_timeout(void);

boolean_t ml_delay_should_spin(uint64_t interval);

uint32_t ml_get_decrementer(void);

#if !CONFIG_SKIP_PRECISE_USER_KERNEL_TIME
void timer_state_event_user_to_kernel(void);
void timer_state_event_kernel_to_user(void);
#endif /* !CONFIG_SKIP_PRECISE_USER_KERNEL_TIME */

uint64_t ml_get_hwclock(void);

#ifdef __arm64__
boolean_t ml_get_timer_pending(void);
#endif

void platform_syscall(
	struct arm_saved_state *);

void ml_set_decrementer(
	uint32_t dec_value);

boolean_t is_user_contex(
	void);

void ml_init_arm_debug_interface(void *args, vm_offset_t virt_address);

/* These calls are only valid if __ARM_USER_PROTECT__ is defined */
uintptr_t arm_user_protect_begin(
                                 thread_t thread);

void arm_user_protect_end(
                          thread_t thread,
                          uintptr_t up,
                          boolean_t disable_interrupts);

#endif /* PEXPERT_KERNEL_PRIVATE || MACH_KERNEL_PRIVATE  */

/* Zero bytes starting at a physical address */
void bzero_phys(
	addr64_t phys_address,
	vm_size_t length);

void bzero_phys_nc(addr64_t src64, vm_size_t bytes);

void ml_thread_policy(
	thread_t thread,
	unsigned policy_id,
	unsigned policy_info);

#define MACHINE_GROUP					0x00000001
#define MACHINE_NETWORK_GROUP			0x10000000
#define MACHINE_NETWORK_WORKLOOP		0x00000001
#define MACHINE_NETWORK_NETISR			0x00000002

/* Initialize the maximum number of CPUs */
void ml_init_max_cpus(
	unsigned int max_cpus);

/* Return the maximum number of CPUs set by ml_init_max_cpus() */
unsigned int ml_get_max_cpus(
	void);

/* Return the maximum memory size */
unsigned int ml_get_machine_mem(void);

#ifdef XNU_KERNEL_PRIVATE
/* Return max offset */
vm_map_offset_t ml_get_max_offset(
	boolean_t	is64,
	unsigned int option);
#define MACHINE_MAX_OFFSET_DEFAULT	0x01
#define MACHINE_MAX_OFFSET_MIN		0x02
#define MACHINE_MAX_OFFSET_MAX		0x04
#define MACHINE_MAX_OFFSET_DEVICE	0x08
#endif

extern void	ml_cpu_up(void);
extern void	ml_cpu_down(void);
extern void	ml_arm_sleep(void);

extern uint64_t ml_get_wake_timebase(void);
extern uint64_t ml_get_conttime_wake_time(void);

/* Time since the system was reset (as part of boot/wake) */
uint64_t ml_get_time_since_reset(void);

#ifdef XNU_KERNEL_PRIVATE
/* Just a stub on ARM */
extern kern_return_t ml_interrupt_prewarm(uint64_t deadline);
#define TCOAL_DEBUG(x, a, b, c, d, e) do { } while(0)
#endif /* XNU_KERNEL_PRIVATE */

/* Bytes available on current stack */
vm_offset_t ml_stack_remaining(void);

#ifdef MACH_KERNEL_PRIVATE
uint32_t	get_fpscr(void);
void		set_fpscr(uint32_t);

extern	void		init_vfp(void);
extern	boolean_t	get_vfp_enabled(void);
extern	void		arm_debug_set_cp14(arm_debug_state_t *debug_state);
extern	void		fiq_context_init(boolean_t enable_fiq);

extern	void		reenable_async_aborts(void);
extern	void		cpu_idle_wfi(boolean_t wfi_fast);

#ifdef MONITOR
#define MONITOR_SET_ENTRY	0x800	/* Set kernel entry point from monitor */
#define MONITOR_LOCKDOWN	0x801	/* Enforce kernel text/rodata integrity */
unsigned long		monitor_call(uintptr_t callnum, uintptr_t arg1,
				     uintptr_t arg2, uintptr_t arg3);
#endif /* MONITOR */

#if defined(KERNEL_INTEGRITY_KTRR)
void rorgn_stash_range(void);
void rorgn_lockdown(void);
#endif /* defined(KERNEL_INTEGRITY_KTRR)*/

#if __ARM_KERNEL_PROTECT__
extern void set_vbar_el1(uint64_t);
#endif /* __ARM_KERNEL_PROTECT__ */
#endif /* MACH_KERNEL_PRIVATE */

extern	uint32_t	arm_debug_read_dscr(void);

extern int	set_be_bit(void);
extern int	clr_be_bit(void);
extern int	be_tracing(void);

typedef void (*broadcastFunc) (void *);
unsigned int cpu_broadcast_xcall(uint32_t *, boolean_t, broadcastFunc, void *);
kern_return_t cpu_xcall(int, broadcastFunc, void *);

#ifdef  KERNEL_PRIVATE

/* Interface to be used by the perf. controller to register a callback, in a
 * single-threaded fashion. The callback will receive notifications of
 * processor performance quality-of-service changes from the scheduler.
 */

#ifdef __arm64__
typedef void (*cpu_qos_update_t)(int throughput_qos, uint64_t qos_param1, uint64_t qos_param2);
void cpu_qos_update_register(cpu_qos_update_t);
#endif /* __arm64__ */

struct going_on_core {
	uint64_t	thread_id;
	uint16_t	qos_class;
	uint16_t	urgency;	/* XCPM compatibility */
	uint32_t	is_32_bit : 1; /* uses 32-bit ISA/register state in userspace (which may differ from address space size) */
	uint32_t	is_kernel_thread : 1;
	uint64_t	thread_group_id;
	void		*thread_group_data;
	uint64_t	scheduling_latency;	/* absolute time between when thread was made runnable and this ctx switch */
	uint64_t	start_time;
	uint64_t	scheduling_latency_at_same_basepri;
	uint32_t	energy_estimate_nj;	/* return: In nanojoules */
	 /* smaller of the time between last change to base priority and ctx switch and scheduling_latency */
};
typedef struct going_on_core *going_on_core_t;

struct going_off_core {
	uint64_t	thread_id;
	uint32_t	energy_estimate_nj;	/* return: In nanojoules */
	uint32_t	reserved;
	uint64_t	end_time;
	uint64_t	thread_group_id;
	void		*thread_group_data;
};
typedef struct going_off_core *going_off_core_t;

struct thread_group_data {
	uint64_t	thread_group_id;
	void		*thread_group_data;
	uint32_t	thread_group_size;
	uint32_t	thread_group_flags;
};
typedef struct thread_group_data *thread_group_data_t;

struct perfcontrol_max_runnable_latency {
	uint64_t	max_scheduling_latencies[4 /* THREAD_URGENCY_MAX */];
};
typedef struct perfcontrol_max_runnable_latency *perfcontrol_max_runnable_latency_t;

struct perfcontrol_work_interval {
	uint64_t	thread_id;
	uint16_t	qos_class;
	uint16_t	urgency;
	uint32_t	flags; // notify
	uint64_t	work_interval_id;
	uint64_t	start;
	uint64_t	finish;
	uint64_t	deadline;
	uint64_t	next_start;
	uint64_t	thread_group_id;
	void		*thread_group_data;
	uint32_t	create_flags;
};
typedef struct perfcontrol_work_interval *perfcontrol_work_interval_t;

typedef enum {
	WORK_INTERVAL_START,
	WORK_INTERVAL_UPDATE,
	WORK_INTERVAL_FINISH
} work_interval_ctl_t;

struct perfcontrol_work_interval_instance {
	work_interval_ctl_t	ctl;
	uint32_t		create_flags;
	uint64_t		complexity;
	uint64_t		thread_id;
	uint64_t		work_interval_id;
	uint64_t		instance_id; /* out: start, in: update/finish */
	uint64_t		start;
	uint64_t		finish;
	uint64_t		deadline;
	uint64_t		thread_group_id;
	void			*thread_group_data;
};
typedef struct perfcontrol_work_interval_instance *perfcontrol_work_interval_instance_t;

/* 
 * Structure to export per-CPU counters as part of the CLPC callout. 
 * Contains only the fixed CPU counters (instructions and cycles); CLPC 
 * would call back into XNU to get the configurable counters if needed. 
 */
struct perfcontrol_cpu_counters {
	uint64_t	instructions;
	uint64_t        cycles;
};

/*
 * Structure used to pass information about a thread to CLPC
 */
struct perfcontrol_thread_data {
	/*
	 * Energy estimate (return value)
	 * The field is populated by CLPC and used to update the 
	 * energy estimate of the thread
	 */
	uint32_t            energy_estimate_nj;
	/* Perfcontrol class for thread */
	perfcontrol_class_t perfctl_class;
	/* Thread ID for the thread */
	uint64_t            thread_id;
	/* Thread Group ID */
	uint64_t            thread_group_id;
	/* 
	 * Scheduling latency for threads at the same base priority. 
	 * Calculated by the scheduler and passed into CLPC. The field is 
	 * populated only in the thread_data structure for the thread 
	 * going on-core. 
	 */
	uint64_t            scheduling_latency_at_same_basepri;
	/* Thread Group data pointer */
	void                *thread_group_data;
	/* perfctl state pointer */
	void                *perfctl_state;
};

/*
 * All callouts from the scheduler are executed with interrupts
 * disabled. Callouts should be implemented in C with minimal
 * abstractions, and only use KPI exported by the mach/libkern
 * symbolset, restricted to routines like spinlocks and atomic
 * operations and scheduler routines as noted below. Spinlocks that
 * are used to synchronize data in the perfcontrol_state_t should only
 * ever be acquired with interrupts disabled, to avoid deadlocks where
 * an quantum expiration timer interrupt attempts to perform a callout
 * that attempts to lock a spinlock that is already held.
 */

/*
 * When a processor is switching between two threads (after the
 * scheduler has chosen a new thread), the low-level platform layer
 * will call this routine, which should perform required timestamps,
 * MMIO register reads, or other state switching. No scheduler locks
 * are held during this callout.
 *
 * This function is called with interrupts ENABLED.
 */
typedef void (*sched_perfcontrol_context_switch_t)(perfcontrol_state_t, perfcontrol_state_t);

/*
 * Once the processor has switched to the new thread, the offcore
 * callout will indicate the old thread that is no longer being
 * run. The thread's scheduler lock is held, so it will not begin
 * running on another processor (in the case of preemption where it
 * remains runnable) until it completes. If the "thread_terminating"
 * boolean is TRUE, this will be the last callout for this thread_id.
 */
typedef void (*sched_perfcontrol_offcore_t)(perfcontrol_state_t, going_off_core_t /* populated by callee */, boolean_t);

/*
 * After the offcore callout and after the old thread can potentially
 * start running on another processor, the oncore callout will be
 * called with the thread's scheduler lock held. The oncore callout is
 * also called any time one of the parameters in the going_on_core_t
 * structure changes, like priority/QoS changes, and quantum
 * expiration, so the callout must not assume callouts are paired with
 * offcore callouts.
 */
typedef void (*sched_perfcontrol_oncore_t)(perfcontrol_state_t, going_on_core_t);

/*
 * Periodically (on hundreds of ms scale), the scheduler will perform
 * maintenance and report the maximum latency for runnable (but not currently
 * running) threads for each urgency class.
 */
typedef void (*sched_perfcontrol_max_runnable_latency_t)(perfcontrol_max_runnable_latency_t);

/*
 * When the kernel receives information about work intervals from userland,
 * it is passed along using this callback. No locks are held, although the state
 * object will not go away during the callout.
 */
typedef void (*sched_perfcontrol_work_interval_notify_t)(perfcontrol_state_t, perfcontrol_work_interval_t);

/*
 * Start, update and finish work interval instance with optional complexity estimate.
 */
typedef void (*sched_perfcontrol_work_interval_ctl_t)(perfcontrol_state_t, perfcontrol_work_interval_instance_t);

/*
 * These callbacks are used when thread groups are added, removed or properties
 * updated.
 * No blocking allocations (or anything else blocking) are allowed inside these
 * callbacks. No locks allowed in these callbacks as well since the kernel might
 * be holding the thread/task locks.
 */
typedef void (*sched_perfcontrol_thread_group_init_t)(thread_group_data_t);
typedef void (*sched_perfcontrol_thread_group_deinit_t)(thread_group_data_t);
typedef void (*sched_perfcontrol_thread_group_flags_update_t)(thread_group_data_t);

/*
 * Sometime after the timeout set by sched_perfcontrol_update_callback_deadline has passed,
 * this function will be called, passing the timeout deadline that was previously armed as an argument.
 *
 * This is called inside context-switch/quantum-interrupt context and must follow the safety rules for that context.
 */
typedef void (*sched_perfcontrol_deadline_passed_t)(uint64_t deadline);

/*
 * Context Switch Callout
 * 
 * Parameters:
 * event        - The perfcontrol_event for this callout
 * cpu_id       - The CPU doing the context switch
 * timestamp    - The timestamp for the context switch
 * flags        - Flags for other relevant information
 * offcore      - perfcontrol_data structure for thread going off-core
 * oncore       - perfcontrol_data structure for thread going on-core
 * cpu_counters - perfcontrol_cpu_counters for the CPU doing the switch
 */
typedef void (*sched_perfcontrol_csw_t)(
	perfcontrol_event event, uint32_t cpu_id, uint64_t timestamp, uint32_t flags,
	struct perfcontrol_thread_data *offcore, struct perfcontrol_thread_data *oncore,
	struct perfcontrol_cpu_counters *cpu_counters, __unused void *unused);


/*
 * Thread State Update Callout
 *
 * Parameters:
 * event        - The perfcontrol_event for this callout
 * cpu_id       - The CPU doing the state update
 * timestamp    - The timestamp for the state update
 * flags        - Flags for other relevant information
 * thr_data     - perfcontrol_data structure for the thread being updated
 */
typedef void (*sched_perfcontrol_state_update_t)(
	perfcontrol_event event, uint32_t cpu_id, uint64_t timestamp, uint32_t flags,
	struct perfcontrol_thread_data *thr_data, __unused void *unused);

/*
 * Callers should always use the CURRENT version so that the kernel can detect both older
 * and newer structure layouts. New callbacks should always be added at the end of the
 * structure, and xnu should expect existing source recompiled against newer headers
 * to pass NULL for unimplemented callbacks. Pass NULL as the as the callbacks parameter
 * to reset callbacks to their default in-kernel values.
 */

#define SCHED_PERFCONTROL_CALLBACKS_VERSION_0 (0) /* up-to oncore */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_1 (1) /* up-to max_runnable_latency */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_2 (2) /* up-to work_interval_notify */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_3 (3) /* up-to thread_group_deinit */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_4 (4) /* up-to deadline_passed */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_5 (5) /* up-to state_update */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_6 (6) /* up-to thread_group_flags_update */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_7 (7) /* up-to work_interval_ctl */
#define SCHED_PERFCONTROL_CALLBACKS_VERSION_CURRENT SCHED_PERFCONTROL_CALLBACKS_VERSION_6

struct sched_perfcontrol_callbacks {
	unsigned long version; /* Use SCHED_PERFCONTROL_CALLBACKS_VERSION_CURRENT */
	sched_perfcontrol_offcore_t                   offcore;
	sched_perfcontrol_context_switch_t            context_switch;
	sched_perfcontrol_oncore_t                    oncore;
	sched_perfcontrol_max_runnable_latency_t      max_runnable_latency;
	sched_perfcontrol_work_interval_notify_t      work_interval_notify;
	sched_perfcontrol_thread_group_init_t         thread_group_init;
	sched_perfcontrol_thread_group_deinit_t       thread_group_deinit;
	sched_perfcontrol_deadline_passed_t           deadline_passed;
	sched_perfcontrol_csw_t                       csw;
	sched_perfcontrol_state_update_t              state_update;
	sched_perfcontrol_thread_group_flags_update_t thread_group_flags_update;
	sched_perfcontrol_work_interval_ctl_t         work_interval_ctl;
};
typedef struct sched_perfcontrol_callbacks *sched_perfcontrol_callbacks_t;

extern void sched_perfcontrol_register_callbacks(sched_perfcontrol_callbacks_t callbacks, unsigned long size_of_state);

/*
 * Update the scheduler with the set of cores that should be used to dispatch new threads.
 * Non-recommended cores can still be used to field interrupts or run bound threads.
 * This should be called with interrupts enabled and no scheduler locks held.
 */
#define ALL_CORES_RECOMMENDED	(~(uint32_t)0)

extern void sched_perfcontrol_update_recommended_cores(uint32_t recommended_cores);
extern void sched_perfcontrol_thread_group_recommend(void *data, cluster_type_t recommendation);

/*
 * Update the deadline after which sched_perfcontrol_deadline_passed will be called.
 * Returns TRUE if it successfully canceled a previously set callback,
 * and FALSE if it did not (i.e. one wasn't set, or callback already fired / is in flight).
 * The callback is automatically canceled when it fires, and does not repeat unless rearmed.
 *
 * This 'timer' executes as the scheduler switches between threads, on a non-idle core
 *
 * There can be only one outstanding timer globally.
 */
extern boolean_t sched_perfcontrol_update_callback_deadline(uint64_t deadline);

typedef enum perfcontrol_callout_type {
    PERFCONTROL_CALLOUT_ON_CORE,
    PERFCONTROL_CALLOUT_OFF_CORE,
    PERFCONTROL_CALLOUT_CONTEXT,
    PERFCONTROL_CALLOUT_STATE_UPDATE,
    /* Add other callout types here */
    PERFCONTROL_CALLOUT_MAX
} perfcontrol_callout_type_t;

typedef enum perfcontrol_callout_stat {
    PERFCONTROL_STAT_INSTRS,
    PERFCONTROL_STAT_CYCLES,
    /* Add other stat types here */
    PERFCONTROL_STAT_MAX
} perfcontrol_callout_stat_t;

uint64_t perfcontrol_callout_stat_avg(perfcontrol_callout_type_t type,
	perfcontrol_callout_stat_t stat);


#endif /* KERNEL_PRIVATE */

boolean_t machine_timeout_suspended(void);
void ml_get_power_state(boolean_t *, boolean_t *);

boolean_t user_cont_hwclock_allowed(void);
boolean_t user_timebase_allowed(void);
boolean_t ml_thread_is64bit(thread_t thread);
void ml_task_set_rop_pid(task_t task, task_t parent_task, boolean_t inherit);

#ifdef __arm64__
void ml_set_align_checking(void);
boolean_t arm64_wfe_allowed(void);
#endif /* __arm64__ */

void ml_timer_evaluate(void);
boolean_t ml_timer_forced_evaluation(void);
uint64_t ml_energy_stat(thread_t);
void ml_gpu_stat_update(uint64_t);
uint64_t ml_gpu_stat(thread_t);
#endif /* __APPLE_API_PRIVATE */

__END_DECLS

#endif /* _ARM_MACHINE_ROUTINES_H_ */