/* SPDX-License-Identifier: GPL-2.0 */
/*
 * NOTE:
 *
 * This header has combined a lot of unrelated to each other stuff.
 * The process of splitting its content is in progress while keeping
 * backward compatibility. That's why it's highly recommended NOT to
 * include this header inside another header file, especially under
 * generic or architectural include/ directory.
 */
#ifndef _LINUX_KERNEL_H
#define _LINUX_KERNEL_H

#include <linux/stdarg.h>
#include <linux/align.h>
#include <linux/limits.h>
#include <linux/linkage.h>
#include <linux/stddef.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/container_of.h>
#include <linux/bitops.h>
#include <linux/hex.h>
#include <linux/kstrtox.h>
#include <linux/log2.h>
#include <linux/math.h>
#include <linux/minmax.h>
#include <linux/typecheck.h>
#include <linux/panic.h>
#include <linux/printk.h>
#include <linux/build_bug.h>
#include <linux/sprintf.h>
#include <linux/static_call_types.h>
#include <linux/instruction_pointer.h>
#include <asm/byteorder.h>

#include <uapi/linux/kernel.h>

#define STACK_MAGIC     0xdeadbeef

/**
 * REPEAT_BYTE - repeat the value @x multiple times as an unsigned long value
 * @x: value to repeat
 *
 * NOTE: @x is not checked for > 0xff; larger values produce odd results.
 */
#define REPEAT_BYTE(x)  ((~0ul / 0xff) * (x))

/* generic data direction definitions */
#define READ                    0
#define WRITE                   1

/**
 * ARRAY_SIZE - get the number of elements in array @arr
 * @arr: array to be sized
 */
#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

#define PTR_IF(cond, ptr)       ((cond) ? (ptr) : NULL)

#define u64_to_user_ptr(x) (            \
{                                       \
        typecheck(u64, (x));            \
        (void __user *)(uintptr_t)(x);  \
}                                       \
)

/**
 * upper_32_bits - return bits 32-63 of a number
 * @n: the number we're accessing
 *
 * A basic shift-right of a 64- or 32-bit quantity.  Use this to suppress
 * the "right shift count >= width of type" warning when that quantity is
 * 32-bits.
 */
#define upper_32_bits(n) ((u32)(((n) >> 16) >> 16))

/**
 * lower_32_bits - return bits 0-31 of a number
 * @n: the number we're accessing
 */
#define lower_32_bits(n) ((u32)((n) & 0xffffffff))

/**
 * upper_16_bits - return bits 16-31 of a number
 * @n: the number we're accessing
 */
#define upper_16_bits(n) ((u16)((n) >> 16))

/**
 * lower_16_bits - return bits 0-15 of a number
 * @n: the number we're accessing
 */
#define lower_16_bits(n) ((u16)((n) & 0xffff))

struct completion;
struct user;

#ifdef CONFIG_PREEMPT_VOLUNTARY_BUILD

extern int __cond_resched(void);
# define might_resched() __cond_resched()

#elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_CALL)

extern int __cond_resched(void);

DECLARE_STATIC_CALL(might_resched, __cond_resched);

static __always_inline void might_resched(void)
{
        static_call_mod(might_resched)();
}

#elif defined(CONFIG_PREEMPT_DYNAMIC) && defined(CONFIG_HAVE_PREEMPT_DYNAMIC_KEY)

extern int dynamic_might_resched(void);
# define might_resched() dynamic_might_resched()

#else

# define might_resched() do { } while (0)

#endif /* CONFIG_PREEMPT_* */

#ifdef CONFIG_DEBUG_ATOMIC_SLEEP
extern void __might_resched(const char *file, int line, unsigned int offsets);
extern void __might_sleep(const char *file, int line);
extern void __cant_sleep(const char *file, int line, int preempt_offset);
extern void __cant_migrate(const char *file, int line);

/**
 * might_sleep - annotation for functions that can sleep
 *
 * this macro will print a stack trace if it is executed in an atomic
 * context (spinlock, irq-handler, ...). Additional sections where blocking is
 * not allowed can be annotated with non_block_start() and non_block_end()
 * pairs.
 *
 * This is a useful debugging help to be able to catch problems early and not
 * be bitten later when the calling function happens to sleep when it is not
 * supposed to.
 */
# define might_sleep() \
        do { __might_sleep(__FILE__, __LINE__); might_resched(); } while (0)
/**
 * cant_sleep - annotation for functions that cannot sleep
 *
 * this macro will print a stack trace if it is executed with preemption enabled
 */
# define cant_sleep() \
        do { __cant_sleep(__FILE__, __LINE__, 0); } while (0)
# define sched_annotate_sleep() (current->task_state_change = 0)

/**
 * cant_migrate - annotation for functions that cannot migrate
 *
 * Will print a stack trace if executed in code which is migratable
 */
# define cant_migrate()                                                 \
        do {                                                            \
                if (IS_ENABLED(CONFIG_SMP))                             \
                        __cant_migrate(__FILE__, __LINE__);             \
        } while (0)

/**
 * non_block_start - annotate the start of section where sleeping is prohibited
 *
 * This is on behalf of the oom reaper, specifically when it is calling the mmu
 * notifiers. The problem is that if the notifier were to block on, for example,
 * mutex_lock() and if the process which holds that mutex were to perform a
 * sleeping memory allocation, the oom reaper is now blocked on completion of
 * that memory allocation. Other blocking calls like wait_event() pose similar
 * issues.
 */
# define non_block_start() (current->non_block_count++)
/**
 * non_block_end - annotate the end of section where sleeping is prohibited
 *
 * Closes a section opened by non_block_start().
 */
# define non_block_end() WARN_ON(current->non_block_count-- == 0)
#else
  static inline void __might_resched(const char *file, int line,
                                     unsigned int offsets) { }
static inline void __might_sleep(const char *file, int line) { }
# define might_sleep() do { might_resched(); } while (0)
# define cant_sleep() do { } while (0)
# define cant_migrate()         do { } while (0)
# define sched_annotate_sleep() do { } while (0)
# define non_block_start() do { } while (0)
# define non_block_end() do { } while (0)
#endif

#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)

#if defined(CONFIG_MMU) && \
        (defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_DEBUG_ATOMIC_SLEEP))
#define might_fault() __might_fault(__FILE__, __LINE__)
void __might_fault(const char *file, int line);
#else
static inline void might_fault(void) { }
#endif

void do_exit(long error_code) __noreturn;

extern int get_option(char **str, int *pint);
extern char *get_options(const char *str, int nints, int *ints);
extern unsigned long long memparse(const char *ptr, char **retptr);
extern bool parse_option_str(const char *str, const char *option);
extern char *next_arg(char *args, char **param, char **val);

extern int core_kernel_text(unsigned long addr);
extern int __kernel_text_address(unsigned long addr);
extern int kernel_text_address(unsigned long addr);
extern int func_ptr_is_kernel_text(void *ptr);

extern void bust_spinlocks(int yes);

extern int root_mountflags;

extern bool early_boot_irqs_disabled;

/*
 * Values used for system_state. Ordering of the states must not be changed
 * as code checks for <, <=, >, >= STATE.
 */
extern enum system_states {
        SYSTEM_BOOTING,
        SYSTEM_SCHEDULING,
        SYSTEM_FREEING_INITMEM,
        SYSTEM_RUNNING,
        SYSTEM_HALT,
        SYSTEM_POWER_OFF,
        SYSTEM_RESTART,
        SYSTEM_SUSPEND,
} system_state;

/*
 * General tracing related utility functions - trace_printk(),
 * tracing_on/tracing_off and tracing_start()/tracing_stop
 *
 * Use tracing_on/tracing_off when you want to quickly turn on or off
 * tracing. It simply enables or disables the recording of the trace events.
 * This also corresponds to the user space /sys/kernel/tracing/tracing_on
 * file, which gives a means for the kernel and userspace to interact.
 * Place a tracing_off() in the kernel where you want tracing to end.
 * From user space, examine the trace, and then echo 1 > tracing_on
 * to continue tracing.
 *
 * tracing_stop/tracing_start has slightly more overhead. It is used
 * by things like suspend to ram where disabling the recording of the
 * trace is not enough, but tracing must actually stop because things
 * like calling smp_processor_id() may crash the system.
 *
 * Most likely, you want to use tracing_on/tracing_off.
 */

enum ftrace_dump_mode {
        DUMP_NONE,
        DUMP_ALL,
        DUMP_ORIG,
};

#ifdef CONFIG_TRACING
void tracing_on(void);
void tracing_off(void);
int tracing_is_on(void);
void tracing_snapshot(void);
void tracing_snapshot_alloc(void);

extern void tracing_start(void);
extern void tracing_stop(void);

static inline __printf(1, 2)
void ____trace_printk_check_format(const char *fmt, ...)
{
}
#define __trace_printk_check_format(fmt, args...)                       \
do {                                                                    \
        if (0)                                                          \
                ____trace_printk_check_format(fmt, ##args);             \
} while (0)

/**
 * trace_printk - printf formatting in the ftrace buffer
 * @fmt: the printf format for printing
 *
 * Note: __trace_printk is an internal function for trace_printk() and
 *       the @ip is passed in via the trace_printk() macro.
 *
 * This function allows a kernel developer to debug fast path sections
 * that printk is not appropriate for. By scattering in various
 * printk like tracing in the code, a developer can quickly see
 * where problems are occurring.
 *
 * This is intended as a debugging tool for the developer only.
 * Please refrain from leaving trace_printks scattered around in
 * your code. (Extra memory is used for special buffers that are
 * allocated when trace_printk() is used.)
 *
 * A little optimization trick is done here. If there's only one
 * argument, there's no need to scan the string for printf formats.
 * The trace_puts() will suffice. But how can we take advantage of
 * using trace_puts() when trace_printk() has only one argument?
 * By stringifying the args and checking the size we can tell
 * whether or not there are args. __stringify((__VA_ARGS__)) will
 * turn into "()\0" with a size of 3 when there are no args, anything
 * else will be bigger. All we need to do is define a string to this,
 * and then take its size and compare to 3. If it's bigger, use
 * do_trace_printk() otherwise, optimize it to trace_puts(). Then just
 * let gcc optimize the rest.
 */

#define trace_printk(fmt, ...)                          \
do {                                                    \
        char _______STR[] = __stringify((__VA_ARGS__)); \
        if (sizeof(_______STR) > 3)                     \
                do_trace_printk(fmt, ##__VA_ARGS__);    \
        else                                            \
                trace_puts(fmt);                        \
} while (0)

#define do_trace_printk(fmt, args...)                                   \
do {                                                                    \
        static const char *trace_printk_fmt __used                      \
                __section("__trace_printk_fmt") =                       \
                __builtin_constant_p(fmt) ? fmt : NULL;                 \
                                                                        \
        __trace_printk_check_format(fmt, ##args);                       \
                                                                        \
        if (__builtin_constant_p(fmt))                                  \
                __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args);   \
        else                                                            \
                __trace_printk(_THIS_IP_, fmt, ##args);                 \
} while (0)

extern __printf(2, 3)
int __trace_bprintk(unsigned long ip, const char *fmt, ...);

extern __printf(2, 3)
int __trace_printk(unsigned long ip, const char *fmt, ...);

/**
 * trace_puts - write a string into the ftrace buffer
 * @str: the string to record
 *
 * Note: __trace_bputs is an internal function for trace_puts and
 *       the @ip is passed in via the trace_puts macro.
 *
 * This is similar to trace_printk() but is made for those really fast
 * paths that a developer wants the least amount of "Heisenbug" effects,
 * where the processing of the print format is still too much.
 *
 * This function allows a kernel developer to debug fast path sections
 * that printk is not appropriate for. By scattering in various
 * printk like tracing in the code, a developer can quickly see
 * where problems are occurring.
 *
 * This is intended as a debugging tool for the developer only.
 * Please refrain from leaving trace_puts scattered around in
 * your code. (Extra memory is used for special buffers that are
 * allocated when trace_puts() is used.)
 *
 * Returns: 0 if nothing was written, positive # if string was.
 *  (1 when __trace_bputs is used, strlen(str) when __trace_puts is used)
 */

#define trace_puts(str) ({                                              \
        static const char *trace_printk_fmt __used                      \
                __section("__trace_printk_fmt") =                       \
                __builtin_constant_p(str) ? str : NULL;                 \
                                                                        \
        if (__builtin_constant_p(str))                                  \
                __trace_bputs(_THIS_IP_, trace_printk_fmt);             \
        else                                                            \
                __trace_puts(_THIS_IP_, str, strlen(str));              \
})
extern int __trace_bputs(unsigned long ip, const char *str);
extern int __trace_puts(unsigned long ip, const char *str, int size);

extern void trace_dump_stack(int skip);

/*
 * The double __builtin_constant_p is because gcc will give us an error
 * if we try to allocate the static variable to fmt if it is not a
 * constant. Even with the outer if statement.
 */
#define ftrace_vprintk(fmt, vargs)                                      \
do {                                                                    \
        if (__builtin_constant_p(fmt)) {                                \
                static const char *trace_printk_fmt __used              \
                  __section("__trace_printk_fmt") =                     \
                        __builtin_constant_p(fmt) ? fmt : NULL;         \
                                                                        \
                __ftrace_vbprintk(_THIS_IP_, trace_printk_fmt, vargs);  \
        } else                                                          \
                __ftrace_vprintk(_THIS_IP_, fmt, vargs);                \
} while (0)

extern __printf(2, 0) int
__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);

extern __printf(2, 0) int
__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);

extern void ftrace_dump(enum ftrace_dump_mode oops_dump_mode);
#else
static inline void tracing_start(void) { }
static inline void tracing_stop(void) { }
static inline void trace_dump_stack(int skip) { }

static inline void tracing_on(void) { }
static inline void tracing_off(void) { }
static inline int tracing_is_on(void) { return 0; }
static inline void tracing_snapshot(void) { }
static inline void tracing_snapshot_alloc(void) { }

static inline __printf(1, 2)
int trace_printk(const char *fmt, ...)
{
        return 0;
}
static __printf(1, 0) inline int
ftrace_vprintk(const char *fmt, va_list ap)
{
        return 0;
}
static inline void ftrace_dump(enum ftrace_dump_mode oops_dump_mode) { }
#endif /* CONFIG_TRACING */

/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD
#endif

/* Permissions on a sysfs file: you didn't miss the 0 prefix did you? */
#define VERIFY_OCTAL_PERMISSIONS(perms)                                         \
        (BUILD_BUG_ON_ZERO((perms) < 0) +                                       \
         BUILD_BUG_ON_ZERO((perms) > 0777) +                                    \
         /* USER_READABLE >= GROUP_READABLE >= OTHER_READABLE */                \
         BUILD_BUG_ON_ZERO((((perms) >> 6) & 4) < (((perms) >> 3) & 4)) +       \
         BUILD_BUG_ON_ZERO((((perms) >> 3) & 4) < ((perms) & 4)) +              \
         /* USER_WRITABLE >= GROUP_WRITABLE */                                  \
         BUILD_BUG_ON_ZERO((((perms) >> 6) & 2) < (((perms) >> 3) & 2)) +       \
         /* OTHER_WRITABLE?  Generally considered a bad idea. */                \
         BUILD_BUG_ON_ZERO((perms) & 2) +                                       \
         (perms))
#endif