215 lines
7.7 KiB
C
Executable file
215 lines
7.7 KiB
C
Executable file
#ifndef PROC_H
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#define PROC_H
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/* Here is the declaration of the process table. It contains all process
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* data, including registers, flags, scheduling priority, memory map,
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* accounting, message passing (IPC) information, and so on.
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*
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* Many assembly code routines reference fields in it. The offsets to these
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* fields are defined in the assembler include file sconst.h. When changing
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* struct proc, be sure to change sconst.h to match.
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*/
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#include <minix/com.h>
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#include "const.h"
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#include "priv.h"
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struct proc {
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struct stackframe_s p_reg; /* process' registers saved in stack frame */
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struct segframe p_seg; /* segment descriptors */
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proc_nr_t p_nr; /* number of this process (for fast access) */
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struct priv *p_priv; /* system privileges structure */
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short p_rts_flags; /* process is runnable only if zero */
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short p_misc_flags; /* flags that do not suspend the process */
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char p_priority; /* current scheduling priority */
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char p_max_priority; /* maximum scheduling priority */
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char p_ticks_left; /* number of scheduling ticks left */
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char p_quantum_size; /* quantum size in ticks */
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struct mem_map p_memmap[NR_LOCAL_SEGS]; /* memory map (T, D, S) */
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struct pagefault p_pagefault; /* valid if PAGEFAULT in p_rts_flags set */
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struct proc *p_nextpagefault; /* next on PAGEFAULT chain */
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clock_t p_user_time; /* user time in ticks */
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clock_t p_sys_time; /* sys time in ticks */
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struct proc *p_nextready; /* pointer to next ready process */
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struct proc *p_caller_q; /* head of list of procs wishing to send */
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struct proc *p_q_link; /* link to next proc wishing to send */
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message *p_messbuf; /* pointer to passed message buffer */
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int p_getfrom_e; /* from whom does process want to receive? */
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int p_sendto_e; /* to whom does process want to send? */
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sigset_t p_pending; /* bit map for pending kernel signals */
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char p_name[P_NAME_LEN]; /* name of the process, including \0 */
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endpoint_t p_endpoint; /* endpoint number, generation-aware */
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/* If handler functions detect a process wants to do something with
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* memory that isn't present, VM has to fix it. Until it has asked
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* what needs to be done and fixed it, save necessary state here.
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*
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* The requester gets a copy of its request message in reqmsg and gets
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* VMREQUEST set.
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*/
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struct {
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struct proc *nextrestart; /* next in vmrestart chain */
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struct proc *nextrequestor; /* next in vmrequest chain */
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#define VMSTYPE_SYS_NONE 0
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#define VMSTYPE_SYS_MESSAGE 1
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#define VMSTYPE_SYS_CALL 2
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#define VMSTYPE_MSGCOPY 3
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int type; /* suspended operation */
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union {
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/* VMSTYPE_SYS_MESSAGE */
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message reqmsg; /* suspended request message */
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/* VMSTYPE_SYS_CALL */
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struct {
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int call_nr;
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message *m_ptr;
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int src_dst_e;
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long bit_map;
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} sys_call;
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/* VMSTYPE_MSGCOPY */
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struct {
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struct proc *dst;
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vir_bytes dst_v;
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message msgbuf;
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} msgcopy;
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} saved;
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/* Parameters of request to VM */
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vir_bytes start, length; /* memory range */
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u8_t writeflag; /* nonzero for write access */
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endpoint_t who;
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/* VM result when available */
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int vmresult;
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/* Target gets this set. (But caller and target can be
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* the same, so we can't put this in the 'saved' union.)
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*/
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struct proc *requestor;
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/* If the suspended operation is a sys_call, its details are
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* stored here.
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*/
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} p_vmrequest;
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struct proc *next_soft_notify;
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int p_softnotified;
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#if DEBUG_SCHED_CHECK
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int p_ready, p_found;
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#endif
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};
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/* Bits for the runtime flags. A process is runnable iff p_rts_flags == 0. */
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#define SLOT_FREE 0x01 /* process slot is free */
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#define NO_PRIORITY 0x02 /* process has been stopped */
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#define SENDING 0x04 /* process blocked trying to send */
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#define RECEIVING 0x08 /* process blocked trying to receive */
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#define SIGNALED 0x10 /* set when new kernel signal arrives */
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#define SIG_PENDING 0x20 /* unready while signal being processed */
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#define P_STOP 0x40 /* set when process is being traced */
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#define NO_PRIV 0x80 /* keep forked system process from running */
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#define NO_ENDPOINT 0x100 /* process cannot send or receive messages */
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#define VMINHIBIT 0x200 /* not scheduled until pagetable set by VM */
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#define PAGEFAULT 0x400 /* process has unhandled pagefault */
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#define VMREQUEST 0x800 /* originator of vm memory request */
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/* These runtime flags can be tested and manipulated by these macros. */
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#define RTS_ISSET(rp, f) (((rp)->p_rts_flags & (f)) == (f))
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/* Set flag and dequeue if the process was runnable. */
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#define RTS_SET(rp, f) \
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do { \
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if(!(rp)->p_rts_flags) { dequeue(rp); } \
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(rp)->p_rts_flags |= (f); \
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} while(0)
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/* Clear flag and enqueue if the process was not runnable but is now. */
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#define RTS_UNSET(rp, f) \
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do { \
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int rts; \
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rts = (rp)->p_rts_flags; \
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(rp)->p_rts_flags &= ~(f); \
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if(rts && !(rp)->p_rts_flags) { enqueue(rp); } \
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} while(0)
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/* Set flag and dequeue if the process was runnable. */
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#define RTS_LOCK_SET(rp, f) \
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do { \
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if(!(rp)->p_rts_flags) { lock_dequeue(rp); } \
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(rp)->p_rts_flags |= (f); \
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} while(0)
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/* Clear flag and enqueue if the process was not runnable but is now. */
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#define RTS_LOCK_UNSET(rp, f) \
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do { \
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int rts; \
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rts = (rp)->p_rts_flags; \
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(rp)->p_rts_flags &= ~(f); \
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if(rts && !(rp)->p_rts_flags) { lock_enqueue(rp); } \
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} while(0)
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/* Set flags to this value. */
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#define RTS_LOCK_SETFLAGS(rp, f) \
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do { \
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if(!(rp)->p_rts_flags && (f)) { lock_dequeue(rp); } \
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(rp)->p_rts_flags = (f); \
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} while(0)
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/* Misc flags */
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#define REPLY_PENDING 0x01 /* reply to IPC_REQUEST is pending */
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#define MF_VM 0x08 /* process uses VM */
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#define MF_ASYNMSG 0x10 /* Asynchrous message pending */
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#define MF_FULLVM 0x20
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/* Scheduling priorities for p_priority. Values must start at zero (highest
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* priority) and increment. Priorities of the processes in the boot image
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* can be set in table.c. IDLE must have a queue for itself, to prevent low
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* priority user processes to run round-robin with IDLE.
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*/
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#define NR_SCHED_QUEUES 16 /* MUST equal minimum priority + 1 */
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#define TASK_Q 0 /* highest, used for kernel tasks */
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#define MAX_USER_Q 0 /* highest priority for user processes */
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#define USER_Q 7 /* default (should correspond to nice 0) */
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#define MIN_USER_Q 14 /* minimum priority for user processes */
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#define IDLE_Q 15 /* lowest, only IDLE process goes here */
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/* Magic process table addresses. */
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#define BEG_PROC_ADDR (&proc[0])
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#define BEG_USER_ADDR (&proc[NR_TASKS])
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#define END_PROC_ADDR (&proc[NR_TASKS + NR_PROCS])
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#define NIL_PROC ((struct proc *) 0)
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#define NIL_SYS_PROC ((struct proc *) 1)
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#define cproc_addr(n) (&(proc + NR_TASKS)[(n)])
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#define proc_addr(n) (pproc_addr + NR_TASKS)[(n)]
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#define proc_nr(p) ((p)->p_nr)
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#define isokprocn(n) ((unsigned) ((n) + NR_TASKS) < NR_PROCS + NR_TASKS)
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#define isemptyn(n) isemptyp(proc_addr(n))
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#define isemptyp(p) ((p)->p_rts_flags == SLOT_FREE)
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#define iskernelp(p) iskerneln((p)->p_nr)
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#define iskerneln(n) ((n) < 0)
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#define isuserp(p) isusern((p)->p_nr)
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#define isusern(n) ((n) >= 0)
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/* The process table and pointers to process table slots. The pointers allow
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* faster access because now a process entry can be found by indexing the
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* pproc_addr array, while accessing an element i requires a multiplication
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* with sizeof(struct proc) to determine the address.
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*/
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EXTERN struct proc proc[NR_TASKS + NR_PROCS]; /* process table */
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EXTERN struct proc *pproc_addr[NR_TASKS + NR_PROCS];
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EXTERN struct proc *rdy_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
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EXTERN struct proc *rdy_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
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#endif /* PROC_H */
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