minix/kernel/glo.h
Tomas Hruby cbc9586c13 Lazy FPU
- FPU context is stored only if conflict between 2 FPU users or while
  exporting context of a process to userspace while it is the active
  user of FPU

- FPU has its owner (fpu_owner) which points to the process whose
  state is currently loaded in FPU

- the FPU exception is only turned on when scheduling a process which
  is not the owner of FPU

- FPU state is restored for the process that generated the FPU
  exception. This process runs immediately without letting scheduler
  to pick a new process to resolve the FPU conflict asap, to minimize
  the FPU thrashing and FPU exception hadler execution

- faster all non-FPU-exception kernel entries as FPU state is not
  checked nor saved

- removed MF_USED_FPU flag, only MF_FPU_INITIALIZED remains to signal
  that a process has used FPU in the past
2010-06-07 07:43:17 +00:00

81 lines
2.7 KiB
C

#ifndef GLO_H
#define GLO_H
/* Global variables used in the kernel. This file contains the declarations;
* storage space for the variables is allocated in table.c, because EXTERN is
* defined as extern unless the _TABLE definition is seen. We rely on the
* compiler's default initialization (0) for several global variables.
*/
#ifdef _TABLE
#undef EXTERN
#define EXTERN
#endif
#include <minix/config.h>
#include <machine/archtypes.h>
#include "archconst.h"
#include "config.h"
#include "debug.h"
/* Kernel information structures. This groups vital kernel information. */
EXTERN struct kinfo kinfo; /* kernel information for users */
EXTERN struct machine machine; /* machine information for users */
EXTERN struct kmessages kmess; /* diagnostic messages in kernel */
EXTERN struct k_randomness krandom; /* gather kernel random information */
EXTERN struct loadinfo kloadinfo; /* status of load average */
/* Process scheduling information and the kernel reentry count. */
EXTERN struct proc *proc_ptr; /* pointer to currently running process */
EXTERN struct proc *bill_ptr; /* process to bill for clock ticks */
EXTERN struct proc *vmrequest; /* first process on vmrequest queue */
EXTERN unsigned lost_ticks; /* clock ticks counted outside clock task */
/* Interrupt related variables. */
EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS]; /* hooks for general use */
EXTERN int irq_actids[NR_IRQ_VECTORS]; /* IRQ ID bits active */
EXTERN int irq_use; /* map of all in-use irq's */
EXTERN u32_t system_hz; /* HZ value */
/* Miscellaneous. */
EXTERN reg_t mon_sp; /* boot monitor stack */
EXTERN int mon_return; /* true if we can return to monitor */
EXTERN int do_serial_debug;
EXTERN time_t boottime;
EXTERN char params_buffer[512]; /* boot monitor parameters */
EXTERN int minix_panicing;
EXTERN char fpu_presence;
EXTERN struct proc * fpu_owner;
EXTERN int verboseboot; /* verbose boot, init'ed in cstart */
#define MAGICTEST 0xC0FFEE23
EXTERN u32_t magictest; /* global magic number */
#if DEBUG_TRACE
EXTERN int verboseflags;
#endif
#ifdef CONFIG_APIC
EXTERN int config_no_apic; /* optionaly turn off apic */
#endif
EXTERN u64_t cpu_hz[CONFIG_MAX_CPUS];
#define cpu_set_freq(cpu, freq) do {cpu_hz[cpu] = freq;} while (0)
#define cpu_get_freq(cpu) cpu_hz[cpu]
/* VM */
EXTERN int vm_running;
EXTERN int catch_pagefaults;
EXTERN struct proc *ptproc;
/* Timing */
EXTERN util_timingdata_t timingdata[TIMING_CATEGORIES];
/* Variables that are initialized elsewhere are just extern here. */
extern struct boot_image image[]; /* system image processes */
extern char *t_stack[]; /* task stack space */
extern struct segdesc_s gdt[]; /* global descriptor table */
EXTERN volatile int serial_debug_active;
#endif /* GLO_H */