#ifndef _LINUX_KERNEL_H#define _LINUX_KERNEL_H/* * 'kernel.h' contains some often-used function prototypes etc */#ifdef __KERNEL__#include <stdarg.h>#include <linux/linkage.h>#include <linux/stddef.h>#include <linux/types.h>#include <linux/compiler.h>#include <linux/bitops.h>#include <linux/log2.h>#include <linux/typecheck.h>#include <linux/ratelimit.h>#include <linux/dynamic_debug.h>#include <asm/byteorder.h>#include <asm/bug.h>extern const char linux_banner[];extern const char linux_proc_banner[];#define USHORT_MAX ((u16)(~0U))#define SHORT_MAX ((s16)(USHORT_MAX>>1))#define SHORT_MIN (-SHORT_MAX - 1)#define INT_MAX ((int)(~0U>>1))#define INT_MIN (-INT_MAX - 1)#define UINT_MAX (~0U)#define LONG_MAX ((long)(~0UL>>1))#define LONG_MIN (-LONG_MAX - 1)#define ULONG_MAX (~0UL)#define LLONG_MAX ((long long)(~0ULL>>1))#define LLONG_MIN (-LLONG_MAX - 1)#define ULLONG_MAX (~0ULL)#define STACK_MAGIC 0xdeadbeef#define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1)#define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask))#define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a)))#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))#define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f))#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))#define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))#define DIV_ROUND_CLOSEST(x, divisor)( \{ \ typeof(divisor) __divisor = divisor; \ (((x) + ((__divisor) / 2)) / (__divisor)); \} \)#define _RET_IP_ (unsigned long)__builtin_return_address(0)#define _THIS_IP_ ({ __label__ __here; __here: (unsigned long)&&__here; })#ifdef CONFIG_LBDAF# include <asm/div64.h># define sector_div(a, b) do_div(a, b)#else# define sector_div(n, b)( \{ \ int _res; \ _res = (n) % (b); \ (n) /= (b); \ _res; \} \)#endif/** * 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))#define KERN_EMERG "<0>" /* system is unusable */#define KERN_ALERT "<1>" /* action must be taken immediately */#define KERN_CRIT "<2>" /* critical conditions */#define KERN_ERR "<3>" /* error conditions */#define KERN_WARNING "<4>" /* warning conditions */#define KERN_NOTICE "<5>" /* normal but significant condition */#define KERN_INFO "<6>" /* informational */#define KERN_DEBUG "<7>" /* debug-level messages *//* Use the default kernel loglevel */#define KERN_DEFAULT "<d>"/* * Annotation for a "continued" line of log printout (only done after a * line that had no enclosing \n). Only to be used by core/arch code * during early bootup (a continued line is not SMP-safe otherwise). */#define KERN_CONT "<c>"extern int console_printk[];#define console_loglevel (console_printk[0])#define default_message_loglevel (console_printk[1])#define minimum_console_loglevel (console_printk[2])#define default_console_loglevel (console_printk[3])struct completion;struct pt_regs;struct user;#ifdef CONFIG_PREEMPT_VOLUNTARYextern int _cond_resched(void);# define might_resched() _cond_resched()#else# define might_resched() do { } while (0)#endif#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP void __might_sleep(char *file, int line, int preempt_offset);/** * 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, ...). * * 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__, 0); might_resched(); } while (0)#else static inline void __might_sleep(char *file, int line, int preempt_offset) { }# define might_sleep() do { might_resched(); } while (0)#endif#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)#define abs(x) ({ \ int __x = (x); \ (__x < 0) ? -__x : __x; \ })#ifdef CONFIG_PROVE_LOCKINGvoid might_fault(void);#elsestatic inline void might_fault(void){ might_sleep();}#endifextern struct atomic_notifier_head panic_notifier_list;extern long (*panic_blink)(long time);NORET_TYPE void panic(const char * fmt, ...) __attribute__ ((NORET_AND format (printf, 1, 2))) __cold;extern void oops_enter(void);extern void oops_exit(void);extern int oops_may_print(void);NORET_TYPE void do_exit(long error_code) ATTRIB_NORET;NORET_TYPE void complete_and_exit(struct completion *, long) ATTRIB_NORET;extern unsigned long simple_strtoul(const char *,char **,unsigned int);extern long simple_strtol(const char *,char **,unsigned int);extern unsigned long long simple_strtoull(const char *,char **,unsigned int);extern long long simple_strtoll(const char *,char **,unsigned int);extern int strict_strtoul(const char *, unsigned int, unsigned long *);extern int strict_strtol(const char *, unsigned int, long *);extern int strict_strtoull(const char *, unsigned int, unsigned long long *);extern int strict_strtoll(const char *, unsigned int, long long *);extern int sprintf(char * buf, const char * fmt, ...) __attribute__ ((format (printf, 2, 3)));extern int vsprintf(char *buf, const char *, va_list) __attribute__ ((format (printf, 2, 0)));extern int snprintf(char * buf, size_t size, const char * fmt, ...) __attribute__ ((format (printf, 3, 4)));extern int vsnprintf(char *buf, size_t size, const char *fmt, va_list args) __attribute__ ((format (printf, 3, 0)));extern int scnprintf(char * buf, size_t size, const char * fmt, ...) __attribute__ ((format (printf, 3, 4)));extern int vscnprintf(char *buf, size_t size, const char *fmt, va_list args) __attribute__ ((format (printf, 3, 0)));extern char *kasprintf(gfp_t gfp, const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));extern char *kvasprintf(gfp_t gfp, const char *fmt, va_list args);extern int sscanf(const char *, const char *, ...) __attribute__ ((format (scanf, 2, 3)));extern int vsscanf(const char *, const char *, va_list) __attribute__ ((format (scanf, 2, 0)));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 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);struct pid;extern struct pid *session_of_pgrp(struct pid *pgrp);/* * FW_BUG * Add this to a message where you are sure the firmware is buggy or behaves * really stupid or out of spec. Be aware that the responsible BIOS developer * should be able to fix this issue or at least get a concrete idea of the * problem by reading your message without the need of looking at the kernel * code. * * Use it for definite and high priority BIOS bugs. * * FW_WARN * Use it for not that clear (e.g. could the kernel messed up things already?) * and medium priority BIOS bugs. * * FW_INFO * Use this one if you want to tell the user or vendor about something * suspicious, but generally harmless related to the firmware. * * Use it for information or very low priority BIOS bugs. */#define FW_BUG "[Firmware Bug]: "#define FW_WARN "[Firmware Warn]: "#define FW_INFO "[Firmware Info]: "#ifdef CONFIG_PRINTKasmlinkage int vprintk(const char *fmt, va_list args) __attribute__ ((format (printf, 1, 0)));asmlinkage int printk(const char * fmt, ...) __attribute__ ((format (printf, 1, 2))) __cold;extern struct ratelimit_state printk_ratelimit_state;extern int printk_ratelimit(void);extern bool printk_timed_ratelimit(unsigned long *caller_jiffies, unsigned int interval_msec);extern int printk_delay_msec;/* * Print a one-time message (analogous to WARN_ONCE() et al): */#define printk_once(x...) ({ \ static bool __print_once = true; \ \ if (__print_once) { \ __print_once = false; \ printk(x); \ } \})void log_buf_kexec_setup(void);#elsestatic inline int vprintk(const char *s, va_list args) __attribute__ ((format (printf, 1, 0)));static inline int vprintk(const char *s, va_list args) { return 0; }static inline int printk(const char *s, ...) __attribute__ ((format (printf, 1, 2)));static inline int __cold printk(const char *s, ...) { return 0; }static inline int printk_ratelimit(void) { return 0; }static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies, \ unsigned int interval_msec) \ { return false; }/* No effect, but we still get type checking even in the !PRINTK case: */#define printk_once(x...) printk(x)static inline void log_buf_kexec_setup(void){}#endifextern int printk_needs_cpu(int cpu);extern void printk_tick(void);extern void asmlinkage __attribute__((format(printf, 1, 2))) early_printk(const char *fmt, ...);unsigned long int_sqrt(unsigned long);static inline void console_silent(void){ console_loglevel = 0;}static inline void console_verbose(void){ if (console_loglevel) console_loglevel = 15;}extern void bust_spinlocks(int yes);extern void wake_up_klogd(void);extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */extern int panic_timeout;extern int panic_on_oops;extern int panic_on_unrecovered_nmi;extern int panic_on_io_nmi;extern const char *print_tainted(void);extern void add_taint(unsigned flag);extern int test_taint(unsigned flag);extern unsigned long get_taint(void);extern int root_mountflags;/* Values used for system_state */extern enum system_states { SYSTEM_BOOTING, SYSTEM_RUNNING, SYSTEM_HALT, SYSTEM_POWER_OFF, SYSTEM_RESTART, SYSTEM_SUSPEND_DISK,} system_state;#define TAINT_PROPRIETARY_MODULE 0#define TAINT_FORCED_MODULE 1#define TAINT_UNSAFE_SMP 2#define TAINT_FORCED_RMMOD 3#define TAINT_MACHINE_CHECK 4#define TAINT_BAD_PAGE 5#define TAINT_USER 6#define TAINT_DIE 7#define TAINT_OVERRIDDEN_ACPI_TABLE 8#define TAINT_WARN 9#define TAINT_CRAP 10extern void dump_stack(void) __cold;enum { DUMP_PREFIX_NONE, DUMP_PREFIX_ADDRESS, DUMP_PREFIX_OFFSET};extern void hex_dump_to_buffer(const void *buf, size_t len, int rowsize, int groupsize, char *linebuf, size_t linebuflen, bool ascii);extern void print_hex_dump(const char *level, const char *prefix_str, int prefix_type, int rowsize, int groupsize, const void *buf, size_t len, bool ascii);extern void print_hex_dump_bytes(const char *prefix_str, int prefix_type, const void *buf, size_t len);extern const char hex_asc[];#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]static inline char *pack_hex_byte(char *buf, u8 byte){ *buf++ = hex_asc_hi(byte); *buf++ = hex_asc_lo(byte); return buf;}#ifndef pr_fmt#define pr_fmt(fmt) fmt#endif#define pr_emerg(fmt, ...) \ printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)#define pr_alert(fmt, ...) \ printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)#define pr_crit(fmt, ...) \ printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)#define pr_err(fmt, ...) \ printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)#define pr_warning(fmt, ...) \ printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)#define pr_notice(fmt, ...) \ printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)#define pr_info(fmt, ...) \ printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)#define pr_cont(fmt, ...) \ printk(KERN_CONT fmt, ##__VA_ARGS__)/* pr_devel() should produce zero code unless DEBUG is defined */#ifdef DEBUG#define pr_devel(fmt, ...) \ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)#else#define pr_devel(fmt, ...) \ ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })#endif/* If you are writing a driver, please use dev_dbg instead */#if defined(DEBUG)#define pr_debug(fmt, ...) \ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)#elif defined(CONFIG_DYNAMIC_DEBUG)/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */#define pr_debug(fmt, ...) do { \ dynamic_pr_debug(fmt, ##__VA_ARGS__); \ } while (0)#else#define pr_debug(fmt, ...) \ ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })#endif/* * 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/debug/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. */#ifdef CONFIG_RING_BUFFERvoid tracing_on(void);void tracing_off(void);/* trace_off_permanent stops recording with no way to bring it back */void tracing_off_permanent(void);int tracing_is_on(void);#elsestatic inline void tracing_on(void) { }static inline void tracing_off(void) { }static inline void tracing_off_permanent(void) { }static inline int tracing_is_on(void) { return 0; }#endif#ifdef CONFIG_TRACINGextern void tracing_start(void);extern void tracing_stop(void);extern void ftrace_off_permanent(void);extern voidftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3);static inline void __attribute__ ((format (printf, 1, 2)))____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. */#define trace_printk(fmt, args...) \do { \ __trace_printk_check_format(fmt, ##args); \ if (__builtin_constant_p(fmt)) { \ static const char *trace_printk_fmt \ __attribute__((section("__trace_printk_fmt"))) = \ __builtin_constant_p(fmt) ? fmt : NULL; \ \ __trace_bprintk(_THIS_IP_, trace_printk_fmt, ##args); \ } else \ __trace_printk(_THIS_IP_, fmt, ##args); \} while (0)extern int__trace_bprintk(unsigned long ip, const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));extern int__trace_printk(unsigned long ip, const char *fmt, ...) __attribute__ ((format (printf, 2, 3)));/* * 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 \ __attribute__((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 int__ftrace_vbprintk(unsigned long ip, const char *fmt, va_list ap);extern int__ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap);extern void ftrace_dump(void);#elsestatic inline voidftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { }static inline inttrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 2)));static inline void tracing_start(void) { }static inline void tracing_stop(void) { }static inline void ftrace_off_permanent(void) { }static inline inttrace_printk(const char *fmt, ...){ return 0;}static inline intftrace_vprintk(const char *fmt, va_list ap){ return 0;}static inline void ftrace_dump(void) { }#endif /* CONFIG_TRACING *//* * Display an IP address in readable format. */#define NIPQUAD(addr) \ ((unsigned char *)&addr)[0], \ ((unsigned char *)&addr)[1], \ ((unsigned char *)&addr)[2], \ ((unsigned char *)&addr)[3]#define NIPQUAD_FMT "%u.%u.%u.%u"/* * min()/max()/clamp() macros that also do * strict type-checking.. See the * "unnecessary" pointer comparison. */#define min(x, y) ({ \ typeof(x) _min1 = (x); \ typeof(y) _min2 = (y); \ (void) (&_min1 == &_min2); \ _min1 < _min2 ? _min1 : _min2; })#define max(x, y) ({ \ typeof(x) _max1 = (x); \ typeof(y) _max2 = (y); \ (void) (&_max1 == &_max2); \ _max1 > _max2 ? _max1 : _max2; })/** * clamp - return a value clamped to a given range with strict typechecking * @val: current value * @min: minimum allowable value * @max: maximum allowable value * * This macro does strict typechecking of min/max to make sure they are of the * same type as val. See the unnecessary pointer comparisons. */#define clamp(val, min, max) ({ \ typeof(val) __val = (val); \ typeof(min) __min = (min); \ typeof(max) __max = (max); \ (void) (&__val == &__min); \ (void) (&__val == &__max); \ __val = __val < __min ? __min: __val; \ __val > __max ? __max: __val; })/* * ..and if you can't take the strict * types, you can specify one yourself. * * Or not use min/max/clamp at all, of course. */#define min_t(type, x, y) ({ \ type __min1 = (x); \ type __min2 = (y); \ __min1 < __min2 ? __min1: __min2; })#define max_t(type, x, y) ({ \ type __max1 = (x); \ type __max2 = (y); \ __max1 > __max2 ? __max1: __max2; })/** * clamp_t - return a value clamped to a given range using a given type * @type: the type of variable to use * @val: current value * @min: minimum allowable value * @max: maximum allowable value * * This macro does no typechecking and uses temporary variables of type * 'type' to make all the comparisons. */#define clamp_t(type, val, min, max) ({ \ type __val = (val); \ type __min = (min); \ type __max = (max); \ __val = __val < __min ? __min: __val; \ __val > __max ? __max: __val; })/** * clamp_val - return a value clamped to a given range using val's type * @val: current value * @min: minimum allowable value * @max: maximum allowable value * * This macro does no typechecking and uses temporary variables of whatever * type the input argument 'val' is. This is useful when val is an unsigned * type and min and max are literals that will otherwise be assigned a signed * integer type. */#define clamp_val(val, min, max) ({ \ typeof(val) __val = (val); \ typeof(val) __min = (min); \ typeof(val) __max = (max); \ __val = __val < __min ? __min: __val; \ __val > __max ? __max: __val; })/* * swap - swap value of @a and @b */#define swap(a, b) \ do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)/** * container_of - cast a member of a structure out to the containing structure * @ptr: the pointer to the member. * @type: the type of the container struct this is embedded in. * @member: the name of the member within the struct. * */#define container_of(ptr, type, member) ({ \ const typeof( ((type *)0)->member ) *__mptr = (ptr); \ (type *)( (char *)__mptr - offsetof(type,member) );})struct sysinfo;extern int do_sysinfo(struct sysinfo *info);#endif /* __KERNEL__ */#define SI_LOAD_SHIFT 16struct sysinfo { long uptime; /* Seconds since boot */ unsigned long loads[3]; /* 1, 5, and 15 minute load averages */ unsigned long totalram; /* Total usable main memory size */ unsigned long freeram; /* Available memory size */ unsigned long sharedram; /* Amount of shared memory */ unsigned long bufferram; /* Memory used by buffers */ unsigned long totalswap; /* Total swap space size */ unsigned long freeswap; /* swap space still available */ unsigned short procs; /* Number of current processes */ unsigned short pad; /* explicit padding for m68k */ unsigned long totalhigh; /* Total high memory size */ unsigned long freehigh; /* Available high memory size */ unsigned int mem_unit; /* Memory unit size in bytes */ char _f[20-2*sizeof(long)-sizeof(int)]; /* Padding: libc5 uses this.. */};/* Force a compilation error if condition is true */#define BUILD_BUG_ON(condition) ((void)BUILD_BUG_ON_ZERO(condition))/* Force a compilation error if condition is constant and true */#define MAYBE_BUILD_BUG_ON(cond) ((void)sizeof(char[1 - 2 * !!(cond)]))/* Force a compilation error if condition is true, but also produce a result (of value 0 and type size_t), so the expression can be used e.g. in a structure initializer (or where-ever else comma expressions aren't permitted). */#define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:-!!(e); }))#define BUILD_BUG_ON_NULL(e) ((void *)sizeof(struct { int:-!!(e); }))/* Trap pasters of __FUNCTION__ at compile-time */#define __FUNCTION__ (__func__)/* This helps us to avoid #ifdef CONFIG_NUMA */#ifdef CONFIG_NUMA#define NUMA_BUILD 1#else#define NUMA_BUILD 0#endif/* Rebuild everything on CONFIG_FTRACE_MCOUNT_RECORD */#ifdef CONFIG_FTRACE_MCOUNT_RECORD# define REBUILD_DUE_TO_FTRACE_MCOUNT_RECORD#endif#endif