minix/kernel/proc.h

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#ifndef PROC_H
#define PROC_H
/* Here is the declaration of the process table. It contains the process'
* registers, memory map, accounting, and message send/receive information.
* Many assembly code routines reference fields in it. The offsets to these
* fields are defined in the assembler include file sconst.h. When changing
* 'proc', be sure to change sconst.h to match.
*
* Changes:
* Nov 10, 2004 separated process types/ priorities (Jorrit N. Herder)
* Sep 30, 2004 bit masks for notifications (Jorrit N. Herder)
* Sep 24, 2004 one timer per type of alarm (Jorrit N. Herder)
* May 01, 2004 new p_sendmask to protect syscalls (Jorrit N. Herder)
*/
#include <minix/com.h>
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#include "protect.h"
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#include "const.h"
struct proc {
struct stackframe_s p_reg; /* process' registers saved in stack frame */
#if (CHIP == INTEL)
reg_t p_ldt_sel; /* selector in gdt giving ldt base and limit*/
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struct segdesc_s p_ldt[2+NR_REMOTE_SEGS]; /* CS, DS and remote segments */
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#endif /* (CHIP == INTEL) */
#if (CHIP == M68000)
/* M68000 specific registers and FPU details go here. */
#endif /* (CHIP == M68000) */
reg_t *p_stguard; /* stack guard word */
int p_nr; /* number of this process (for fast access) */
notify_mask_t p_ntf_blocked; /* bit mask for blocked notifications */
notify_mask_t p_ntf_held; /* bit mask for held up notify() calls */
struct proc *p_ntf_nextheld; /* next in chain of held-up int processes */
int p_flags; /* SENDING, RECEIVING, etc. */
struct mem_map p_memmap[NR_LOCAL_SEGS]; /* local memory map (T, D, S) */
struct far_mem p_farmem[NR_REMOTE_SEGS]; /* remote memory map */
short p_type; /* task, system, driver, server, user, idle */
short p_priority; /* scheduling priority */
clock_t user_time; /* user time in ticks */
clock_t sys_time; /* sys time in ticks */
clock_t child_utime; /* cumulative user time of children */
clock_t child_stime; /* cumulative sys time of children */
timer_t p_signalrm; /* signal alarm timer */
timer_t p_flagalrm; /* flag alarm timer */
timer_t p_syncalrm; /* synchronous alarm timer */
send_mask_t p_sendmask; /* mask indicating to whom proc may send */
struct proc *p_callerq; /* head of list of procs wishing to send */
struct proc *p_sendlink; /* link to next proc wishing to send */
message *p_messbuf; /* pointer to message buffer */
int p_getfrom; /* from whom does process want to receive? */
int p_sendto; /* to whom does process want to send? */
struct proc *p_nextready; /* pointer to next ready process */
sigset_t p_pending; /* bit map for pending signals */
unsigned p_pendcount; /* count of pending and unfinished signals */
char p_name[PROC_NAME_LEN]; /* name of the process, including \0 */
};
/* Guard word for task stacks. */
#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
/* Bits for p_flags in proc[]. A process is runnable iff p_flags == 0. */
#define NO_MAP 0x01 /* keeps unmapped forked child from running */
#define SENDING 0x02 /* set when process blocked trying to send */
#define RECEIVING 0x04 /* set when process blocked trying to recv */
#define PENDING 0x08 /* set when inform() of signal pending */
#define SIG_PENDING 0x10 /* keeps to-be-signalled proc from running */
#define P_STOP 0x20 /* set when process is being traced */
/* Values for p_type. Non-negative values represent active process types.
* Process types are important to model inter-process relationships. When
* MINIX is shutdown, all system services are notified in order of possible
* dependencies, so that, e.g., the FS can rely on drivers to synchronize.
*/
#define P_RESERVED -2 /* slot is not in use, but reserved */
#define P_NONE -1 /* slot is not in use, and free */
#define P_TASK 0 /* kernel process */
#define P_SYSTEM 1 /* low-level system service */
#define P_DRIVER 2 /* device driver */
#define P_SERVER 3 /* system service outside the kernel */
#define P_USER 4 /* user process */
#define P_IDLE 5 /* idle process */
/* Scheduling priorities for p_priority. Values must start at zero and
* increment. Priorities of system services can be set in the task table.
* Task, user, and idle priorities are fixed; the rest can be selected.
*/
#define PPRI_TASK 0 /* reserved for kernel tasks */
#define PPRI_HIGHER 1
#define PPRI_HIGH 2
#define PPRI_NORMAL 3
#define PPRI_LOW 4
#define PPRI_LOWER 5
#define PPRI_USER 6 /* reserved for user processes */
#define PPRI_IDLE 7 /* only IDLE process goes here */
#define NR_SCHED_QUEUES 8 /* MUST equal minimum priority + 1 */
/* Magic process table addresses. */
#define BEG_PROC_ADDR (&proc[0])
#define BEG_USER_ADDR (&proc[NR_TASKS])
#define END_PROC_ADDR (&proc[NR_TASKS + NR_PROCS])
#define NIL_PROC ((struct proc *) 0)
#define isidlehardware(n) ((n) == IDLE || (n) == HARDWARE)
#define isokprocn(n) ((unsigned) ((n) + NR_TASKS) < NR_PROCS + NR_TASKS)
#define isokprocp(p) ((p) >= BEG_PROC_ADDR && (p) < END_PROC_ADDR)
#define isoksrc_dst(n) (isokprocn(n) || (n) == ANY)
#define isalive(n) (proc_addr(n)->p_type > P_NONE)
#define isalivep(p) ((p)->p_type > P_NONE)
#define isrxhardware(n) ((n) == ANY || (n) == HARDWARE)
#define iskernel(n) ((n) == CLOCK || (n) == SYSTASK)
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#define issysentn(n) ((n) == FS_PROC_NR || (n) == PM_PROC_NR)
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#define issysentp(p) (issysentn((p)->p_nr))
#define isreservedp(p) ((p)->p_type == P_RESERVED)
#define isemptyp(p) ((p)->p_type == P_NONE)
#define istaskp(p) ((p)->p_type == P_TASK)
#define isdriverp(p) ((p)->p_type == P_DRIVER)
#define isserverp(p) ((p)->p_type == P_SERVER)
#define isuserp(p) ((p)->p_type == P_USER)
#define isuser(n) (proc_addr(n)->p_type == P_USER)
#define isidlep(p) ((p)->p_type == P_IDLE)
#define proc_addr(n) (pproc_addr + NR_TASKS)[(n)]
#define cproc_addr(n) (&(proc + NR_TASKS)[(n)])
#define proc_number(p) ((p)->p_nr)
#define proc_vir2phys(p, vir) \
(((phys_bytes)(p)->p_map[D].mem_phys << CLICK_SHIFT) \
+ (vir_bytes) (vir))
/* The process table and pointers to process table slots. The pointers allow
* faster access because now a process entry can be found by indexing the
* pproc_addr array, while accessing an element i requires a multiplication
* with sizeof(struct proc) to determine the address.
*/
EXTERN struct proc proc[NR_TASKS + NR_PROCS]; /* process table */
EXTERN struct proc *pproc_addr[NR_TASKS + NR_PROCS];
EXTERN struct proc *bill_ptr; /* ptr to process to bill for clock ticks */
EXTERN struct proc *rdy_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
EXTERN struct proc *rdy_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
#endif /* PROC_H */