| 1 | #ifndef PRIV_H
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| 2 | #define PRIV_H
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| 3 |
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| 4 | /* Declaration of the system privileges structure. It defines flags, system
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| 5 | * call masks, an synchronous alarm timer, I/O privileges, pending hardware
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| 6 | * interrupts and notifications, and so on.
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| 7 | * System processes each get their own structure with properties, whereas all
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| 8 | * user processes share one structure. This setup provides a clear separation
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| 9 | * between common and privileged process fields and is very space efficient.
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| 10 | *
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| 11 | * Changes:
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| 12 | * Jul 01, 2005 Created. (Jorrit N. Herder)
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| 13 | */
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| 14 | #include <minix/com.h>
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| 15 | #include "protect.h"
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| 16 | #include "const.h"
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| 17 | #include "type.h"
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| 18 |
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| 19 | struct priv {
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| 20 | proc_nr_t s_proc_nr; /* number of associated process */
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| 21 | sys_id_t s_id; /* index of this system structure */
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| 22 | short s_flags; /* PREEMTIBLE, BILLABLE, etc. */
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| 23 |
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| 24 | short s_trap_mask; /* allowed system call traps */
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| 25 | sys_map_t s_ipc_from; /* allowed callers to receive from */
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| 26 | sys_map_t s_ipc_to; /* allowed destination processes */
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| 27 | long s_call_mask; /* allowed kernel calls */
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| 28 |
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| 29 | sys_map_t s_notify_pending; /* bit map with pending notifications */
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| 30 | irq_id_t s_int_pending; /* pending hardware interrupts */
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| 31 | sigset_t s_sig_pending; /* pending signals */
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| 32 |
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| 33 | timer_t s_alarm_timer; /* synchronous alarm timer */
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| 34 | struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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| 35 | reg_t *s_stack_guard; /* stack guard word for kernel tasks */
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| 36 | };
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| 37 |
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| 38 | /* Guard word for task stacks. */
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| 39 | #define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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| 40 |
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| 41 | /* Bits for the system property flags. */
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| 42 | #define PREEMPTIBLE 0x01 /* kernel tasks are not preemptible */
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| 43 | #define BILLABLE 0x04 /* some processes are not billable */
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| 44 | #define SYS_PROC 0x10 /* system processes are privileged */
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| 45 | #define SENDREC_BUSY 0x20 /* sendrec() in progress */
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| 46 |
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| 47 | /* Magic system structure table addresses. */
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| 48 | #define BEG_PRIV_ADDR (&priv[0])
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| 49 | #define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
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| 50 |
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| 51 | #define priv_addr(i) (ppriv_addr)[(i)]
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| 52 | #define priv_id(rp) ((rp)->p_priv->s_id)
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| 53 | #define priv(rp) ((rp)->p_priv)
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| 54 |
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| 55 | #define id_to_nr(id) priv_addr(id)->s_proc_nr
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| 56 | #define nr_to_id(nr) priv(proc_addr(nr))->s_id
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| 57 |
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| 58 | /* The system structures table and pointers to individual table slots. The
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| 59 | * pointers allow faster access because now a process entry can be found by
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| 60 | * indexing the psys_addr array, while accessing an element i requires a
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| 61 | * multiplication with sizeof(struct sys) to determine the address.
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| 62 | */
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| 63 | EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
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| 64 | EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
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| 65 |
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| 66 | /* Unprivileged user processes all share the same privilege structure.
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| 67 | * This id must be fixed because it is used to check send mask entries.
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| 68 | */
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| 69 | #define USER_PRIV_ID 0
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| 70 |
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| 71 | /* Make sure the system can boot. The following sanity check verifies that
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| 72 | * the system privileges table is large enough for the number of processes
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| 73 | * in the boot image.
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| 74 | */
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| 75 | #if (NR_BOOT_PROCS > NR_SYS_PROCS)
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| 76 | #error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
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| 77 | #endif
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| 78 |
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| 79 | #endif /* PRIV_H */
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