minix/kernel/glo.h
Tomas Hruby f51eea4b32 Changed pagefault delivery to VM
this patch changes the way pagefaults are delivered to VM. It adopts
the same model as the out-of-quantum messages sent by kernel to a
scheduler.

- everytime a userspace pagefault occurs, kernel creates a message
  which is sent to VM on behalf of the faulting process

- the process is blocked on delivery to VM in the standard IPC code
  instead of waiting in a spacial in-kernel queue (stack) and is not
  runnable until VM tell kernel that the pagefault is resolved and is
  free to clear the RTS_PAGEFAULT flag.

- VM does not need call kernel and poll the pagefault information
  which saves many (1/2?) calls and kernel calls that return "no more
  data"

- VM notification by kernel does not need to use signals

- each entry in proc table is by 12 bytes smaller (~3k save)
2010-04-26 23:21:26 +00:00

81 lines
2.8 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 char osfxsr_feature; /* FXSAVE/FXRSTOR instructions support (SSEx) */
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 unsigned 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 */