minix/kernel/glo.h

   1 #ifndef GLO_H
   2 #define GLO_H
   3
   4 /* Global variables used in the kernel. This file contains the declarations;
   5  * storage space for the variables is allocated in table.c, because EXTERN is
   6  * defined as extern unless the _TABLE definition is seen. We rely on the
   7  * compiler's default initialization (0) for several global variables.
   8  */
   9 #ifdef _TABLE
  10 #undef EXTERN
  11 #define EXTERN
  12 #endif
  13
  14 #include <minix/config.h>
  15 #include <minix/ipcconst.h>
  16 #include <machine/archtypes.h>
  17 #include "archconst.h"
  18 #include "config.h"
  19 #include "debug.h"
  20
  21 /* Kernel information structures. This groups vital kernel information. */
  22 extern struct kinfo kinfo;                /* kernel information for users */
  23 extern struct machine machine;            /* machine information for users */
  24 extern struct kmessages kmessages;        /* diagnostic messages in kernel */
  25 extern struct loadinfo loadinfo;          /* status of load average */
  26 extern struct minix_kerninfo minix_kerninfo;
  27
  28 EXTERN struct k_randomness krandom;     /* gather kernel random information */
  29
  30 EXTERN vir_bytes minix_kerninfo_user;
  31
  32 #define kmess kmessages
  33 #define kloadinfo loadinfo
  34
  35 /* Process scheduling information and the kernel reentry count. */
  36 EXTERN struct proc *vmrequest;  /* first process on vmrequest queue */
  37 EXTERN unsigned lost_ticks;     /* clock ticks counted outside clock task */
  38 EXTERN char *ipc_call_names[IPCNO_HIGHEST+1]; /* human-readable call names */
  39 EXTERN struct proc *kbill_kcall; /* process that made kernel call */
  40 EXTERN struct proc *kbill_ipc; /* process that invoked ipc */
  41
  42 /* Interrupt related variables. */
  43 EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS];      /* hooks for general use */
  44 EXTERN int irq_actids[NR_IRQ_VECTORS];          /* IRQ ID bits active */
  45 EXTERN int irq_use;                             /* map of all in-use irq's */
  46 EXTERN u32_t system_hz;                         /* HZ value */
  47
  48 /* Miscellaneous. */
  49 EXTERN time_t boottime;
  50 EXTERN int verboseboot;                 /* verbose boot, init'ed in cstart */
  51
  52 #if DEBUG_TRACE
  53 EXTERN int verboseflags;
  54 #endif
  55
  56 #ifdef USE_APIC
  57 EXTERN int config_no_apic; /* optionally turn off apic */
  58 EXTERN int config_apic_timer_x; /* apic timer slowdown factor */
  59 #endif
  60
  61 EXTERN u64_t cpu_hz[CONFIG_MAX_CPUS];
  62
  63 #define cpu_set_freq(cpu, freq) do {cpu_hz[cpu] = freq;} while (0)
  64 #define cpu_get_freq(cpu)       cpu_hz[cpu]
  65
  66 #ifdef CONFIG_SMP
  67 EXTERN int config_no_smp; /* optionally turn off SMP */
  68 #endif
  69
  70 /* VM */
  71 EXTERN int vm_running;
  72 EXTERN int catch_pagefaults;
  73 EXTERN int kernel_may_alloc;
  74
  75 /* Variables that are initialized elsewhere are just extern here. */
  76 extern struct boot_image image[NR_BOOT_PROCS];  /* system image processes */
  77
  78 EXTERN volatile int serial_debug_active;
  79
  80 EXTERN struct cpu_info cpu_info[CONFIG_MAX_CPUS];
  81
  82 /* BKL stats */
  83 EXTERN u64_t kernel_ticks[CONFIG_MAX_CPUS];
  84 EXTERN u64_t bkl_ticks[CONFIG_MAX_CPUS];
  85 EXTERN unsigned bkl_tries[CONFIG_MAX_CPUS];
  86 EXTERN unsigned bkl_succ[CONFIG_MAX_CPUS];
  87
  88 /* Feature flags */
  89 EXTERN int minix_feature_flags;
  90
  91 #endif /* GLO_H */