451a6890d6
- Currently the cpu time quantum is timer-ticks based. Thus the remaining quantum is decreased only if the processes is interrupted by a timer tick. As processes block a lot this typically does not happen for normal user processes. Also the quantum depends on the frequency of the timer. - This change makes the quantum miliseconds based. Internally the miliseconds are translated into cpu cycles. Everytime userspace execution is interrupted by kernel the cycles just consumed by the current process are deducted from the remaining quantum. - It makes the quantum system timer frequency independent. - The boot processes quantum is loosely derived from the tick-based quantas and 60Hz timer and subject to future change - the 64bit arithmetics is a little ugly, will be changes once we have compiler support for 64bit integers (soon)
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
#ifndef GLO_H
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#define GLO_H
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/* Global variables used in the kernel. This file contains the declarations;
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* storage space for the variables is allocated in table.c, because EXTERN is
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* defined as extern unless the _TABLE definition is seen. We rely on the
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* compiler's default initialization (0) for several global variables.
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*/
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#ifdef _TABLE
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#undef EXTERN
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#define EXTERN
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#endif
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#include <minix/config.h>
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#include <machine/archtypes.h>
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#include "archconst.h"
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#include "config.h"
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#include "debug.h"
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/* Kernel information structures. This groups vital kernel information. */
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EXTERN struct kinfo kinfo; /* kernel information for users */
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EXTERN struct machine machine; /* machine information for users */
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EXTERN struct kmessages kmess; /* diagnostic messages in kernel */
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EXTERN struct k_randomness krandom; /* gather kernel random information */
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EXTERN struct loadinfo kloadinfo; /* status of load average */
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/* Process scheduling information and the kernel reentry count. */
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EXTERN struct proc *proc_ptr; /* pointer to currently running process */
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EXTERN struct proc *bill_ptr; /* process to bill for clock ticks */
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EXTERN struct proc *vmrequest; /* first process on vmrequest queue */
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EXTERN unsigned lost_ticks; /* clock ticks counted outside clock task */
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/* Interrupt related variables. */
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EXTERN irq_hook_t irq_hooks[NR_IRQ_HOOKS]; /* hooks for general use */
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EXTERN int irq_actids[NR_IRQ_VECTORS]; /* IRQ ID bits active */
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EXTERN int irq_use; /* map of all in-use irq's */
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EXTERN u32_t system_hz; /* HZ value */
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/* Miscellaneous. */
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EXTERN reg_t mon_sp; /* boot monitor stack */
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EXTERN int mon_return; /* true if we can return to monitor */
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EXTERN int do_serial_debug;
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EXTERN time_t boottime;
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EXTERN char params_buffer[512]; /* boot monitor parameters */
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EXTERN int minix_panicing;
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EXTERN char fpu_presence;
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EXTERN char osfxsr_feature; /* FXSAVE/FXRSTOR instructions support (SSEx) */
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EXTERN int verboseboot; /* verbose boot, init'ed in cstart */
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#define MAGICTEST 0xC0FFEE23
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EXTERN u32_t magictest; /* global magic number */
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#if DEBUG_TRACE
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EXTERN int verboseflags;
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#endif
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#ifdef CONFIG_APIC
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EXTERN int config_no_apic; /* optionaly turn off apic */
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#endif
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EXTERN u64_t cpu_hz[CONFIG_MAX_CPUS];
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#define cpu_set_freq(cpu, freq) do {cpu_hz[cpu] = freq;} while (0)
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#define cpu_get_freq(cpu) cpu_hz[cpu]
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/* VM */
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EXTERN int vm_running;
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EXTERN int catch_pagefaults;
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EXTERN struct proc *ptproc;
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/* Timing */
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EXTERN util_timingdata_t timingdata[TIMING_CATEGORIES];
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/* Variables that are initialized elsewhere are just extern here. */
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extern struct boot_image image[]; /* system image processes */
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extern char *t_stack[]; /* task stack space */
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extern struct segdesc_s gdt[]; /* global descriptor table */
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EXTERN volatile int serial_debug_active;
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#endif /* GLO_H */
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