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 services */
  23 extern struct machine machine;            /* machine info for services */
  24 extern struct kmessages kmessages;        /* diagnostic messages in kernel */
  25 extern struct loadinfo loadinfo;          /* status of load average */
  26 extern struct kuserinfo kuserinfo;        /* kernel information for users */
  27 extern struct arm_frclock arm_frclock;    /* ARM free-running timer info */
  28 extern struct kclockinfo kclockinfo;      /* clock information */
  29 extern struct minix_kerninfo minix_kerninfo;
  30
  31 EXTERN struct k_randomness krandom;     /* gather kernel random information */
  32
  33 EXTERN vir_bytes minix_kerninfo_user;
  34
  35 #define kmess kmessages
  36 #define kloadinfo loadinfo
  37
  38 #define system_hz (kclockinfo.hz)               /* HZ value (alias) */
  39
  40 /* Process scheduling information and the kernel reentry count. */
  41 EXTERN struct proc *vmrequest;  /* first process on vmrequest queue */
  42 EXTERN unsigned lost_ticks;     /* clock ticks counted outside clock task */
  43 EXTERN char *ipc_call_names[IPCNO_HIGHEST+1]; /* human-readable call names */
  44 EXTERN struct proc *kbill_kcall; /* process that made kernel call */
  45 EXTERN struct proc *kbill_ipc; /* process that invoked ipc */
  46
  47 /* Interrupt related variables. */
  48 EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS];      /* hooks for general use */
  49 EXTERN int irq_actids[NR_IRQ_VECTORS];          /* IRQ ID bits active */
  50 EXTERN int irq_use;                             /* map of all in-use irq's */
  51
  52 /* Miscellaneous. */
  53 EXTERN int verboseboot;                 /* verbose boot, init'ed in cstart */
  54
  55 #if DEBUG_TRACE
  56 EXTERN int verboseflags;
  57 #endif
  58
  59 #ifdef USE_APIC
  60 EXTERN int config_no_apic; /* optionally turn off apic */
  61 EXTERN int config_apic_timer_x; /* apic timer slowdown factor */
  62 #endif
  63
  64 EXTERN u64_t cpu_hz[CONFIG_MAX_CPUS];
  65
  66 #define cpu_set_freq(cpu, freq) do {cpu_hz[cpu] = freq;} while (0)
  67 #define cpu_get_freq(cpu)       cpu_hz[cpu]
  68
  69 #ifdef CONFIG_SMP
  70 EXTERN int config_no_smp; /* optionally turn off SMP */
  71 #endif
  72
  73 /* VM */
  74 EXTERN int vm_running;
  75 EXTERN int catch_pagefaults;
  76 EXTERN int kernel_may_alloc;
  77
  78 /* Variables that are initialized elsewhere are just extern here. */
  79 extern struct boot_image image[NR_BOOT_PROCS];  /* system image processes */
  80
  81 EXTERN volatile int serial_debug_active;
  82
  83 EXTERN struct cpu_info cpu_info[CONFIG_MAX_CPUS];
  84
  85 /* BKL stats */
  86 EXTERN u64_t kernel_ticks[CONFIG_MAX_CPUS];
  87 EXTERN u64_t bkl_ticks[CONFIG_MAX_CPUS];
  88 EXTERN unsigned bkl_tries[CONFIG_MAX_CPUS];
  89 EXTERN unsigned bkl_succ[CONFIG_MAX_CPUS];
  90
  91 /* Feature flags */
  92 EXTERN int minix_feature_flags;
  93
  94 #endif /* GLO_H */