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      1 /**
      2  * @file compat22.h
      3  * Compatability functions for 2.2 kernels
      4  *
      5  * @remark Copyright 2002 OProfile authors
      6  * @remark Read the file COPYING
      7  *
      8  * @author John Levon
      9  * @author Philippe Elie
     10  */
     11 
     12 #ifndef COMPAT22_H
     13 #define COMPAT22_H
     14 
     15 #include <linux/smp_lock.h>
     16 
     17 #define local_irq_disable()	__cli()
     18 #define local_irq_enable()	__sti()
     19 #define pte_page_address(a) pte_page(a)
     20 
     21 #define GET_VM_OFFSET(v) ((v)->vm_offset)
     22 #define MODULE_LICENSE(l)
     23 #define NEED_2_2_DENTRIES
     24 #define INC_USE_COUNT_MAYBE MOD_INC_USE_COUNT
     25 #define DEC_USE_COUNT_MAYBE MOD_DEC_USE_COUNT
     26 #define lock_execve lock_kernel
     27 #define unlock_execve unlock_kernel
     28 
     29 /* BKL-protected on 2.2 */
     30 #define lock_mmap(mm) do {} while (0)
     31 #define unlock_mmap(mm) do {} while (0)
     32 
     33 /* on 2.2 we use pid as tgid, thread seperation is possible but
     34  * each thread is in its own thread group */
     35 static inline pid_t op_get_tgid(void)
     36 {
     37 	return current->pid;
     38 }
     39 
     40 /* the wake_up path doesn't disable interrupts for wait queue
     41  * manipulation. So let's force it to.
     42  */
     43 static inline void oprof_wake_up(struct wait_queue **q)
     44 {
     45 	unsigned long flags;
     46 	save_flags(flags);
     47 	cli();
     48 	wake_up(q);
     49 	restore_flags(flags);
     50 }
     51 
     52 extern int wind_dentries_2_2(struct dentry * dentry);
     53 extern uint do_path_hash_2_2(struct dentry * dentry);
     54 #define wind_dentries(d, v, r, m) wind_dentries_2_2(d)
     55 #define hash_path(f) do_path_hash_2_2((f)->f_dentry)
     56 
     57 static inline void lock_out_mmap(void)
     58 {
     59 	lock_kernel();
     60 	down(&current->mm->mmap_sem);
     61 }
     62 
     63 static inline void unlock_out_mmap(void)
     64 {
     65 	unlock_kernel();
     66 	up(&current->mm->mmap_sem);
     67 }
     68 
     69 /* different request_region */
     70 #define request_region_check compat_request_region
     71 void * compat_request_region (unsigned long start, unsigned long n, char const * name);
     72 
     73 #define __exit
     74 
     75 #define virt_to_page(va) MAP_NR(va)
     76 
     77 /* 2.2 has no cpu_number_map on UP */
     78 #ifdef CONFIG_SMP
     79 	#define op_cpu_id() cpu_number_map[smp_processor_id()]
     80 #else
     81 	#define op_cpu_id() smp_processor_id()
     82 #endif /* CONFIG_SMP */
     83 
     84 /* provide a working smp_call_function */
     85 #if !defined(CONFIG_SMP)
     86 
     87 	#undef smp_call_function
     88 	static int inline smp_call_function (void (*func) (void * info), void * info,
     89 					     int retry, int wait)
     90 	{
     91 		return 0;
     92 	}
     93 
     94 #endif /* !CONFIG_SMP */
     95 
     96 #if V_BEFORE(2, 2, 18)
     97 
     98 	/* 2.2.18 introduced module_init */
     99 	/* Not sure what version aliases were introduced in, but certainly in 2.91.66.  */
    100 	#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 91)
    101 		#define module_init(x)	int init_module(void) __attribute__((alias(#x)));
    102 		#define module_exit(x)	void cleanup_module(void) __attribute__((alias(#x)));
    103 	#else
    104 		#define module_init(x)	int init_module(void) { return x(); }
    105 		#define module_exit(x)	void cleanup_module(void) { x(); }
    106 	#endif
    107 
    108 	/* 2.2.18 introduced vmalloc_32 */
    109 	#define vmalloc_32 vmalloc
    110 
    111 	/* 2.2.18 add doubled linked list wait_queue and mutex */
    112 	#define DECLARE_WAIT_QUEUE_HEAD(q) struct wait_queue * q = NULL
    113 	#define DECLARE_MUTEX(foo)	struct semaphore foo = MUTEX
    114 
    115 	/* 2.2.18 add THIS_MODULE */
    116 	#define THIS_MODULE (&__this_module)
    117 
    118 	/* 2.2.18 add BUG() FIXME: this is arch dependant would must use
    119 	 * *(char *)0 = 0 instead ? */
    120 	#define BUG() __asm__ __volatile__("ud2\n");
    121 
    122 #endif /* V_BEFORE(2,2,18) */
    123 
    124 /* 2.2.18 introduced the rtc lock */
    125 #ifdef RTC_LOCK
    126 	#define lock_rtc(f) spin_lock_irqsave(&rtc_lock, f)
    127 	#define unlock_rtc(f) spin_unlock_irqrestore(&rtc_lock, f)
    128 #else
    129 	#define lock_rtc(f) do { save_flags(f); cli(); } while (0)
    130 	#define unlock_rtc(f) restore_flags(f)
    131 #endif /* RTC_LOCK */
    132 
    133 #if V_AT_LEAST(2, 2, 20)
    134 	#define PTRACE_OFF(t) ((t)->ptrace &= ~PT_DTRACE)
    135 #else
    136 	#define PTRACE_OFF(t) ((t)->flags &= ~PF_DTRACE)
    137 #endif
    138 
    139 /* 2.2.21 introduced cpuid_edx */
    140 #if V_BEFORE(2, 2, 21)
    141 static inline unsigned int cpuid_edx(unsigned int op)
    142 {
    143 	unsigned int eax, edx;
    144 
    145 	__asm__("cpuid"
    146 		: "=a" (eax), "=d" (edx)
    147 		: "0" (op)
    148 		: "bx", "cx");
    149 	return edx;
    150 }
    151 #endif
    152 
    153 #endif /* COMPAT22_H */
    154