1335d5d700
instance numbers, encoded and decoded using macros in <minix/endpoint.h>.
proc number -> endpoint migration
. proc_nr in the interrupt hook is now an endpoint, proc_nr_e.
. m_source for messages and notifies is now an endpoint, instead of
proc number.
. isokendpt() converts an endpoint to a process number, returns
success (but fails if the process number is out of range, the
process slot is not a living process, or the given endpoint
number does not match the endpoint number in the process slot,
indicating an old process).
. okendpt() is the same as isokendpt(), but panic()s if the conversion
fails. This is mainly used for decoding message.m_source endpoints,
and other endpoint numbers in kernel data structures, which should
always be correct.
. if DEBUG_ENABLE_IPC_WARNINGS is enabled, isokendpt() and okendpt()
get passed the __FILE__ and __LINE__ of the calling lines, and
print messages about what is wrong with the endpoint number
(out of range proc, empty proc, or inconsistent endpoint number),
with the caller, making finding where the conversion failed easy
without having to include code for every call to print where things
went wrong. Sometimes this is harmless (wrong arg to a kernel call),
sometimes it's a fatal internal inconsistency (bogus m_source).
. some process table fields have been appended an _e to indicate it's
become and endpoint.
. process endpoint is stored in p_endpoint, without generation number.
it turns out the kernel never needs the generation number, except
when fork()ing, so it's decoded then.
. kernel calls all take endpoints as arguments, not proc numbers.
the one exception is sys_fork(), which needs to know in which slot
to put the child.
68 lines
2.6 KiB
C
Executable file
68 lines
2.6 KiB
C
Executable file
#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 "config.h"
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/* Variables relating to shutting down MINIX. */
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EXTERN char kernel_exception; /* TRUE after system exceptions */
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EXTERN char shutdown_started; /* TRUE after shutdowns / reboots */
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/* Kernel information structures. This groups vital kernel information. */
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EXTERN phys_bytes aout; /* address of a.out headers */
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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 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 *prev_ptr; /* previously running process */
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EXTERN struct proc *proc_ptr; /* pointer to currently running process */
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EXTERN struct proc *next_ptr; /* next process to run after restart() */
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EXTERN struct proc *bill_ptr; /* process to bill for clock ticks */
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EXTERN char k_reenter; /* kernel reentry count (entry count less 1) */
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EXTERN unsigned lost_ticks; /* clock ticks counted outside clock task */
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#if (CHIP == INTEL)
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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 irq_hook_t *irq_handlers[NR_IRQ_VECTORS];/* list of IRQ handlers */
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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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/* Miscellaneous. */
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EXTERN reg_t mon_ss, 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 int who_e, who_p; /* message source endpoint and proc */
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/* VM */
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EXTERN phys_bytes vm_base;
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EXTERN phys_bytes vm_size;
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EXTERN phys_bytes vm_mem_high;
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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 _PROTOTYPE( void (*level0_func), (void) );
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#endif /* (CHIP == INTEL) */
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#if (CHIP == M68000)
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/* M68000 specific variables go here. */
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#endif
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#endif /* GLO_H */
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