minix/kernel/type.h

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#ifndef TYPE_H
#define TYPE_H
#include <minix/com.h>
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typedef _PROTOTYPE( void task_t, (void) );
/* Process table and system property related types. */
typedef int proc_nr_t; /* process table entry number */
typedef short sys_id_t; /* system process index */
typedef struct { /* bitmap for system indexes */
bitchunk_t chunk[BITMAP_CHUNKS(NR_SYS_PROCS)];
} sys_map_t;
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struct boot_image {
proc_nr_t proc_nr; /* process number to use */
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task_t *initial_pc; /* start function for tasks */
int flags; /* process flags */
unsigned char quantum; /* quantum (tick count) */
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int priority; /* scheduling priority */
int stksize; /* stack size for tasks */
short trap_mask; /* allowed system call traps */
bitchunk_t ipc_to; /* send mask protection */
int *k_calls; /* kern. call protection */
int nr_k_calls;
char proc_name[P_NAME_LEN]; /* name in process table */
endpoint_t endpoint; /* endpoint number when started */
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};
struct memory {
phys_clicks base; /* start address of chunk */
phys_clicks size; /* size of memory chunk */
};
/* The kernel outputs diagnostic messages in a circular buffer. */
struct kmessages {
int km_next; /* next index to write */
int km_size; /* current size in buffer */
char km_buf[KMESS_BUF_SIZE]; /* buffer for messages */
};
struct randomness {
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struct {
int r_next; /* next index to write */
int r_size; /* number of random elements */
unsigned short r_buf[RANDOM_ELEMENTS]; /* buffer for random info */
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} bin[RANDOM_SOURCES];
};
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typedef unsigned long irq_policy_t;
typedef unsigned long irq_id_t;
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typedef struct irq_hook {
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struct irq_hook *next; /* next hook in chain */
int (*handler)(struct irq_hook *); /* interrupt handler */
int irq; /* IRQ vector number */
int id; /* id of this hook */
'proc number' is process slot, 'endpoint' are generation-aware process 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.
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int proc_nr_e; /* (endpoint) NONE if not in use */
irq_id_t notify_id; /* id to return on interrupt */
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irq_policy_t policy; /* bit mask for policy */
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} irq_hook_t;
typedef int (*irq_handler_t)(struct irq_hook *);
#endif /* TYPE_H */