2f892aca91
There seems to have been a broken assumption in the fpu context restoring code. It restores the context of the running process, without guarantee that the current process is the one that will be scheduled. This caused fpu saving for a different process to be triggered without fpu hardware being enabled, causing an fpu exception in the kernel. This practically only shows up with DEBUG_RACE on. Fix my thruby+me. The fix . is to only set the fpu-in-use-by-this-process flag in the exception handler, and then take care of fpu restoring when actually returning to userspace And the patch . translates fpu saving and restoring to c in arch_system.c, getting rid of a juicy chunk of assembly . makes osfxsr_feature private to arch_system.c . removes most of the arch dependent code from do_sigsend
81 lines
2.7 KiB
C
81 lines
2.7 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 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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