| 1 | #ifndef PROC_H
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| 2 | #define PROC_H
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| 3 |
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| 4 | /* Here is the declaration of the process table. It contains all process
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| 5 | * data, including registers, flags, scheduling priority, memory map,
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| 6 | * accounting, message passing (IPC) information, and so on.
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| 7 | *
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| 8 | * Many assembly code routines reference fields in it. The offsets to these
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| 9 | * fields are defined in the assembler include file sconst.h. When changing
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| 10 | * struct proc, be sure to change sconst.h to match.
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| 11 | */
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| 12 | #include <minix/com.h>
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| 13 | #include "protect.h"
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| 14 | #include "const.h"
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| 15 | #include "priv.h"
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| 16 |
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| 17 | struct proc {
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| 18 | struct stackframe_s p_reg; /* process' registers saved in stack frame */
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| 19 | reg_t p_ldt_sel; /* selector in gdt with ldt base and limit */
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| 20 | struct segdesc_s p_ldt[2+NR_REMOTE_SEGS]; /* CS, DS and remote segments */
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| 21 |
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| 22 | proc_nr_t p_nr; /* number of this process (for fast access) */
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| 23 | struct priv *p_priv; /* system privileges structure */
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| 24 | char p_rts_flags; /* SENDING, RECEIVING, etc. */
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| 25 |
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| 26 | char p_priority; /* current scheduling priority */
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| 27 | char p_max_priority; /* maximum scheduling priority */
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| 28 | char p_ticks_left; /* number of scheduling ticks left */
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| 29 | char p_quantum_size; /* quantum size in ticks */
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| 30 |
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| 31 | struct mem_map p_memmap[NR_LOCAL_SEGS]; /* memory map (T, D, S) */
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| 32 |
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| 33 | clock_t p_user_time; /* user time in ticks */
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| 34 | clock_t p_sys_time; /* sys time in ticks */
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| 35 |
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| 36 | struct proc *p_nextready; /* pointer to next ready process */
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| 37 | struct proc *p_caller_q; /* head of list of procs wishing to send */
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| 38 | struct proc *p_q_link; /* link to next proc wishing to send */
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| 39 | message *p_messbuf; /* pointer to passed message buffer */
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| 40 | proc_nr_t p_getfrom; /* from whom does process want to receive? */
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| 41 | proc_nr_t p_sendto; /* to whom does process want to send? */
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| 42 |
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| 43 | sigset_t p_pending; /* bit map for pending kernel signals */
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| 44 |
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| 45 | char p_name[P_NAME_LEN]; /* name of the process, including \0 */
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| 46 | };
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| 47 |
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| 48 | /* Bits for the runtime flags. A process is runnable iff p_rts_flags == 0. */
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| 49 | #define SLOT_FREE 0x01 /* process slot is free */
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| 50 | #define NO_MAP 0x02 /* keeps unmapped forked child from running */
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| 51 | #define SENDING 0x04 /* process blocked trying to SEND */
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| 52 | #define RECEIVING 0x08 /* process blocked trying to RECEIVE */
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| 53 | #define SIGNALED 0x10 /* set when new kernel signal arrives */
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| 54 | #define SIG_PENDING 0x20 /* unready while signal being processed */
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| 55 | #define P_STOP 0x40 /* set when process is being traced */
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| 56 | #define NO_PRIV 0x80 /* keep forked system process from running */
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| 57 |
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| 58 | /* Scheduling priorities for p_priority. Values must start at zero (highest
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| 59 | * priority) and increment. Priorities of the processes in the boot image
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| 60 | * can be set in table.c. IDLE must have a queue for itself, to prevent low
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| 61 | * priority user processes to run round-robin with IDLE.
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| 62 | */
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| 63 | #define NR_SCHED_QUEUES 16 /* MUST equal minimum priority + 1 */
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| 64 | #define TASK_Q 0 /* highest, used for kernel tasks */
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| 65 | #define MAX_USER_Q 0 /* highest priority for user processes */
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| 66 | #define USER_Q 7 /* default (should correspond to nice 0) */
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| 67 | #define MIN_USER_Q 14 /* minimum priority for user processes */
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| 68 | #define IDLE_Q 15 /* lowest, only IDLE process goes here */
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| 69 |
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| 70 | /* Magic process table addresses. */
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| 71 | #define BEG_PROC_ADDR (&proc[0])
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| 72 | #define BEG_USER_ADDR (&proc[NR_TASKS])
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| 73 | #define END_PROC_ADDR (&proc[NR_TASKS + NR_PROCS])
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| 74 |
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| 75 | #define NIL_PROC ((struct proc *) 0)
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| 76 | #define NIL_SYS_PROC ((struct proc *) 1)
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| 77 | #define cproc_addr(n) (&(proc + NR_TASKS)[(n)])
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| 78 | #define proc_addr(n) (pproc_addr + NR_TASKS)[(n)]
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| 79 | #define proc_nr(p) ((p)->p_nr)
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| 80 |
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| 81 | #define isokprocn(n) ((unsigned) ((n) + NR_TASKS) < NR_PROCS + NR_TASKS)
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| 82 | #define isemptyn(n) isemptyp(proc_addr(n))
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| 83 | #define isemptyp(p) ((p)->p_rts_flags == SLOT_FREE)
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| 84 | #define iskernelp(p) iskerneln((p)->p_nr)
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| 85 | #define iskerneln(n) ((n) < 0)
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| 86 | #define isuserp(p) isusern((p)->p_nr)
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| 87 | #define isusern(n) ((n) >= 0)
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| 88 |
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| 89 | /* The process table and pointers to process table slots. The pointers allow
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| 90 | * faster access because now a process entry can be found by indexing the
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| 91 | * pproc_addr array, while accessing an element i requires a multiplication
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| 92 | * with sizeof(struct proc) to determine the address.
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| 93 | */
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| 94 | EXTERN struct proc proc[NR_TASKS + NR_PROCS]; /* process table */
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| 95 | EXTERN struct proc *pproc_addr[NR_TASKS + NR_PROCS];
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| 96 | EXTERN struct proc *rdy_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
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| 97 | EXTERN struct proc *rdy_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
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| 98 |
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| 99 | #endif /* PROC_H */
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