u-boot/include/linux/compat.h

#ifndef _LINUX_COMPAT_H_
#define _LINUX_COMPAT_H_

#include <console.h>
#include <cyclic.h>
#include <log.h>
#include <malloc.h>

#include <asm/processor.h>

#include <linux/types.h>
#include <linux/err.h>
#include <linux/kernel.h>

#ifdef CONFIG_XEN
#include <xen/events.h>
#endif

struct unused {};
typedef struct unused unused_t;

struct p_current{
       int pid;
};

extern struct p_current *current;

#define GFP_ATOMIC ((gfp_t) 0)
#define GFP_KERNEL ((gfp_t) 0)
#define GFP_NOFS ((gfp_t) 0)
#define GFP_USER ((gfp_t) 0)
#define __GFP_NOWARN ((gfp_t) 0)
#define __GFP_ZERO	((__force gfp_t)0x8000u)	/* Return zeroed page on success */

void *kmalloc(size_t size, int flags);

static inline void *kzalloc(size_t size, gfp_t flags)
{
	return kmalloc(size, flags | __GFP_ZERO);
}

static inline void *kmalloc_array(size_t n, size_t size, gfp_t flags)
{
	if (size != 0 && n > SIZE_MAX / size)
		return NULL;
	return kmalloc(n * size, flags | __GFP_ZERO);
}

static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
	return kmalloc_array(n, size, flags | __GFP_ZERO);
}

#define vmalloc(size)	kmalloc(size, 0)
#define __vmalloc(size, flags, pgsz)	kmalloc(size, flags)
static inline void *vzalloc(unsigned long size)
{
	return kzalloc(size, 0);
}
static inline void kfree(const void *block)
{
	free((void *)block);
}
static inline void vfree(const void *addr)
{
	free((void *)addr);
}

struct kmem_cache { int sz; };

struct kmem_cache *get_mem(int element_sz);
#define kmem_cache_create(a, sz, c, d, e)	get_mem(sz)
void *kmem_cache_alloc(struct kmem_cache *obj, int flag);
static inline void kmem_cache_free(struct kmem_cache *cachep, void *obj)
{
	free(obj);
}
static inline void kmem_cache_destroy(struct kmem_cache *cachep)
{
	free(cachep);
}

#define DECLARE_WAITQUEUE(...)	do { } while (0)
#define add_wait_queue(...)	do { } while (0)
#define remove_wait_queue(...)	do { } while (0)

#ifndef CONFIG_XEN
#define eventchn_poll()
#endif

#define __wait_event_timeout(condition, timeout, ret)		\
({								\
	ulong __ret = ret; /* explicit shadow */		\
	ulong start = get_timer(0);				\
	for (;;) {						\
		eventchn_poll();				\
		if (condition) {				\
			__ret = 1;				\
			break;					\
	}							\
	if ((get_timer(start) > timeout) || ctrlc()) {		\
		__ret = 0;					\
		break;						\
	}							\
	cpu_relax();						\
	}							\
	__ret;							\
})

/**
 * wait_event_timeout() - Wait until the event occurs before the timeout.
 * @wr_head: The wait queue to wait on.
 * @condition: Expression for the event to wait for.
 * @timeout: Maximum waiting time.
 *
 * We wait until the @condition evaluates to %true (succeed) or
 * %false (@timeout elapsed).
 *
 * Return:
 * 0 - if the @condition evaluated to %false after the @timeout elapsed
 * 1 - if the @condition evaluated to %true
 */
#define wait_event_timeout(wq_head, condition, timeout)			\
({									\
	ulong __ret;							\
	if (condition)							\
		__ret = 1;						\
	else								\
		__ret = __wait_event_timeout(condition, timeout, __ret);\
	__ret;								\
})

#define KERNEL_VERSION(a,b,c)	(((a) << 16) + ((b) << 8) + (c))

/* This is also defined in ARMv8's mmu.h */
#ifndef PAGE_SIZE
#define PAGE_SIZE	4096
#endif

/* drivers/char/random.c */
#define get_random_bytes(...)

/* include/linux/leds.h */
struct led_trigger {};

#define DEFINE_LED_TRIGGER(x)		static struct led_trigger *x;
enum led_brightness {
	LED_OFF		= 0,
	LED_HALF	= 127,
	LED_FULL	= 255,
};

static inline void led_trigger_register_simple(const char *name,
					struct led_trigger **trigger) {}
static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
static inline void led_trigger_event(struct led_trigger *trigger,
					enum led_brightness event) {}

/* uapi/linux/limits.h */
#define XATTR_LIST_MAX 65536	/* size of extended attribute namelist (64k) */

/**
 * The type used for indexing onto a disc or disc partition.
 *
 * Linux always considers sectors to be 512 bytes long independently
 * of the devices real block size.
 *
 * blkcnt_t is the type of the inode's block count.
 */
#ifdef CONFIG_LBDAF
typedef u64 sector_t;
typedef u64 blkcnt_t;
#else
typedef unsigned long sector_t;
typedef unsigned long blkcnt_t;
#endif

/* module */
#define THIS_MODULE		0
#define try_module_get(...)	1
#define module_put(...)		do { } while (0)
#define module_init(...)
#define module_exit(...)
#define EXPORT_SYMBOL(...)
#define EXPORT_SYMBOL_GPL(...)
#define module_param(...)
#define module_param_call(...)
#define MODULE_PARM_DESC(...)
#define MODULE_VERSION(...)
#define MODULE_DESCRIPTION(...)
#define MODULE_AUTHOR(...)
#define MODULE_LICENSE(...)
#define MODULE_ALIAS(...)
#define __module_get(...)

/* character device */
#define MKDEV(...)			0
#define MAJOR(dev)			0
#define MINOR(dev)			0

#define alloc_chrdev_region(...)	0
#define unregister_chrdev_region(...)

#define class_create(...)		__builtin_return_address(0)
#define class_create_file(...)		0
#define class_register(...)		0
#define class_unregister(...)
#define class_remove_file(...)
#define class_destroy(...)
#define misc_register(...)		0
#define misc_deregister(...)

#define blocking_notifier_call_chain(...) 0

#define __initdata
#define late_initcall(...)

#define dev_set_name(...)		do { } while (0)
#define device_register(...)		0
#define device_unregister(...)
#define volume_sysfs_init(...)		0
#define volume_sysfs_close(...)		do { } while (0)

#define init_waitqueue_head(...)	do { } while (0)
#define wait_event_interruptible(...)	0
#define wake_up_interruptible(...)	do { } while (0)
#define dump_stack(...)			do { } while (0)

#define task_pid_nr(x)			0
#define set_freezable(...)		do { } while (0)
#define try_to_freeze(...)		0
#define set_current_state(...)		do { } while (0)
#define kthread_should_stop(...)	0

#define setup_timer(timer, func, data) do {} while (0)
#define del_timer_sync(timer) do {} while (0)
#define schedule_work(work) do {} while (0)
#define INIT_WORK(work, fun) do {} while (0)

struct work_struct {};

unsigned long copy_from_user(void *dest, const void *src,
			     unsigned long count);

typedef unused_t spinlock_t;
typedef int	wait_queue_head_t;

#define spin_lock_init(lock) do {} while (0)
#define spin_lock(lock) do {} while (0)
#define spin_unlock(lock) do {} while (0)
#define spin_lock_irqsave(lock, flags) do {} while (0)
#define spin_unlock_irqrestore(lock, flags) do { flags = 0; } while (0)

#define DEFINE_MUTEX(...)
#define mutex_init(...)
#define mutex_lock(...)
#define mutex_unlock(...)

#define init_rwsem(...)			do { } while (0)
#define down_read(...)			do { } while (0)
#define down_write(...)			do { } while (0)
#define down_write_trylock(...)		1
#define up_read(...)			do { } while (0)
#define up_write(...)			do { } while (0)

#define cond_resched()			do { } while (0)
#define yield()				do { } while (0)

#define __init
#define __exit
#define __devinit
#define __devinitdata
#define __devinitconst

#define kthread_create(...)	__builtin_return_address(0)
#define kthread_stop(...)	do { } while (0)
#define wake_up_process(...)	do { } while (0)

struct rw_semaphore { int i; };
#define down_write(...)			do { } while (0)
#define up_write(...)			do { } while (0)
#define down_read(...)			do { } while (0)
#define up_read(...)			do { } while (0)
struct device {
	struct device		*parent;
	struct class		*class;
	dev_t			devt;	/* dev_t, creates the sysfs "dev" */
	void	(*release)(struct device *dev);
	/* This is used from drivers/usb/musb-new subsystem only */
	void		*driver_data;	/* data private to the driver */
	void            *device_data;   /* data private to the device */
};
struct mutex { int i; };
struct kernel_param { int i; };

struct cdev {
	int owner;
	dev_t dev;
};
#define cdev_init(...)		do { } while (0)
#define cdev_add(...)		0
#define cdev_del(...)		do { } while (0)

#define prandom_u32(...)	0

typedef struct {
	uid_t val;
} kuid_t;

typedef struct {
	gid_t val;
} kgid_t;

/* from include/linux/types.h */

/**
 * struct callback_head - callback structure for use with RCU and task_work
 * @next: next update requests in a list
 * @func: actual update function to call after the grace period.
 */
struct callback_head {
	struct callback_head *next;
	void (*func)(struct callback_head *head);
};
#define rcu_head callback_head
enum writeback_sync_modes {
	WB_SYNC_NONE,	/* Don't wait on anything */
	WB_SYNC_ALL,	/* Wait on every mapping */
};

/* from include/linux/writeback.h */
/*
 * A control structure which tells the writeback code what to do.  These are
 * always on the stack, and hence need no locking.  They are always initialised
 * in a manner such that unspecified fields are set to zero.
 */
struct writeback_control {
	long nr_to_write;		/* Write this many pages, and decrement
					   this for each page written */
	long pages_skipped;		/* Pages which were not written */

	/*
	 * For a_ops->writepages(): if start or end are non-zero then this is
	 * a hint that the filesystem need only write out the pages inside that
	 * byterange.  The byte at `end' is included in the writeout request.
	 */
	loff_t range_start;
	loff_t range_end;

	enum writeback_sync_modes sync_mode;

	unsigned for_kupdate:1;		/* A kupdate writeback */
	unsigned for_background:1;	/* A background writeback */
	unsigned tagged_writepages:1;	/* tag-and-write to avoid livelock */
	unsigned for_reclaim:1;		/* Invoked from the page allocator */
	unsigned range_cyclic:1;	/* range_start is cyclic */
	unsigned for_sync:1;		/* sync(2) WB_SYNC_ALL writeback */
};

void *kmemdup(const void *src, size_t len, gfp_t gfp);

typedef int irqreturn_t;

struct timer_list {};
struct notifier_block {};

typedef unsigned long dmaaddr_t;

#define pm_runtime_get_sync(dev) do {} while (0)
#define pm_runtime_put(dev) do {} while (0)
#define pm_runtime_put_sync(dev) do {} while (0)
#define pm_runtime_use_autosuspend(dev) do {} while (0)
#define pm_runtime_set_autosuspend_delay(dev, delay) do {} while (0)
#define pm_runtime_enable(dev) do {} while (0)

#define IRQ_NONE 0
#define IRQ_HANDLED 1
#define IRQ_WAKE_THREAD 2

#define dev_set_drvdata(dev, data) do {} while (0)

#define enable_irq(...)
#define disable_irq(...)
#define disable_irq_wake(irq) do {} while (0)
#define enable_irq_wake(irq) -EINVAL
#define free_irq(irq, data) do {} while (0)
#define request_irq(nr, f, flags, nm, data) 0

#endif