72 lines
2.7 KiB
C
Executable file
72 lines
2.7 KiB
C
Executable file
#ifndef PRIV_H
|
|
#define PRIV_H
|
|
|
|
/* Declaration of the system privileges structure. It defines flags, system
|
|
* call masks, an synchronous alarm timer, I/O privileges, pending hardware
|
|
* interrupts and notifications, and so on.
|
|
* System processes each get their own structure with properties, whereas all
|
|
* user processes share one structure. This setup provides a clear separation
|
|
* between common and privileged process fields and is very space efficient.
|
|
*
|
|
* Created: Jul 1, 2005 Jorrit N. Herder
|
|
*/
|
|
#include <minix/com.h>
|
|
#include "protect.h"
|
|
#include "const.h"
|
|
#include "type.h"
|
|
|
|
struct priv {
|
|
proc_nr_t s_proc_nr; /* number of associated process */
|
|
sys_id_t s_id; /* index of this system structure */
|
|
char s_flags; /* PREEMTIBLE, BILLABLE, etc. */
|
|
|
|
char s_call_mask; /* allowed system call traps */
|
|
sys_map_t s_send_mask; /* allowed send destinations */
|
|
long s_sys_mask; /* allowed kernel calls */
|
|
|
|
sys_map_t s_notify_pending; /* bit map with pending notifications */
|
|
short s_int_pending; /* pending hardware interrupts */
|
|
|
|
timer_t s_alarm_timer; /* synchronous alarm timer */
|
|
struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
|
|
reg_t *s_stack_guard; /* stack guard word for kernel tasks */
|
|
};
|
|
|
|
/* Guard word for task stacks. */
|
|
#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
|
|
|
|
/* Bits for the system property flags. */
|
|
#define PREEMPTIBLE 0x01 /* kernel tasks are not preemptible */
|
|
#define RDY_Q_HEAD 0x02 /* add to queue head instead of tail */
|
|
#define BILLABLE 0x04 /* some processes are not billable */
|
|
#define SYS_PROC 0x10 /* system processes are privileged */
|
|
|
|
/* Magic system structure table addresses. */
|
|
#define BEG_PRIV_ADDR (&priv[0])
|
|
#define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
|
|
|
|
#define priv_addr(i) (ppriv_addr)[(i)]
|
|
#define priv_id(rp) ((rp)->p_priv->s_id)
|
|
#define priv(rp) ((rp)->p_priv)
|
|
|
|
#define id_to_nr(id) priv_addr(id)->s_proc_nr;
|
|
#define nr_to_id(nr) priv(proc_addr(nr))->s_id;
|
|
|
|
/* The system structures table and pointers to individual table slots. The
|
|
* pointers allow faster access because now a process entry can be found by
|
|
* indexing the psys_addr array, while accessing an element i requires a
|
|
* multiplication with sizeof(struct sys) to determine the address.
|
|
*/
|
|
EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
|
|
EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
|
|
|
|
/* Make sure the system can boot. The following sanity check verifies that
|
|
* the system privileges table is large enough for the number of processes
|
|
* in the boot image.
|
|
*/
|
|
#if (NR_BOOT_PROCS > NR_SYS_PROCS)
|
|
#error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
|
|
#endif
|
|
|
|
#endif /* PRIV_H */
|