minix/kernel/priv.h

   1 #ifndef PRIV_H
   2 #define PRIV_H
   3
   4 /* Declaration of the system privileges structure. It defines flags, system
   5  * call masks, an synchronous alarm timer, I/O privileges, pending hardware
   6  * interrupts and notifications, and so on.
   7  * System processes each get their own structure with properties, whereas all
   8  * user processes share one structure. This setup provides a clear separation
   9  * between common and privileged process fields and is very space efficient.
  10  *
  11  * Changes:
  12  *   Nov 22, 2009  rewrite of privilege management (Cristiano Giuffrida)
  13  *   Jul 01, 2005  Created.  (Jorrit N. Herder)
  14  */
  15 #include <minix/com.h>
  16 #include <minix/const.h>
  17 #include <minix/priv.h>
  18 #include "kernel/const.h"
  19 #include "kernel/type.h"
  20
  21 struct priv {
  22   proc_nr_t s_proc_nr;          /* number of associated process */
  23   sys_id_t s_id;                /* index of this system structure */
  24   short s_flags;                /* PREEMTIBLE, BILLABLE, etc. */
  25
  26   /* Asynchronous sends */
  27   vir_bytes s_asyntab;          /* addr. of table in process' address space */
  28   size_t s_asynsize;            /* number of elements in table. 0 when not in
  29                                  * use
  30                                  */
  31
  32   short s_trap_mask;            /* allowed system call traps */
  33   sys_map_t s_ipc_to;           /* allowed destination processes */
  34
  35   /* allowed kernel calls */
  36   bitchunk_t s_k_call_mask[SYS_CALL_MASK_SIZE];
  37
  38   endpoint_t s_sig_mgr;         /* signal manager for system signals */
  39   endpoint_t s_bak_sig_mgr;     /* backup signal manager for system signals */
  40   sys_map_t s_notify_pending;   /* bit map with pending notifications */
  41   sys_map_t s_asyn_pending;     /* bit map with pending asyn messages */
  42   irq_id_t s_int_pending;       /* pending hardware interrupts */
  43   sigset_t s_sig_pending;       /* pending signals */
  44
  45   minix_timer_t s_alarm_timer;  /* synchronous alarm timer */
  46   reg_t *s_stack_guard;         /* stack guard word for kernel tasks */
  47
  48   char s_diag_sig;              /* send a SIGKMESS when diagnostics arrive? */
  49
  50   int s_nr_io_range;            /* allowed I/O ports */
  51   struct io_range s_io_tab[NR_IO_RANGE];
  52
  53   int s_nr_mem_range;           /* allowed memory ranges */
  54   struct minix_mem_range s_mem_tab[NR_MEM_RANGE];
  55
  56   int s_nr_irq;                 /* allowed IRQ lines */
  57   int s_irq_tab[NR_IRQ];
  58   vir_bytes s_grant_table;      /* grant table address of process, or 0 */
  59   int s_grant_entries;          /* no. of entries, or 0 */
  60 };
  61
  62 /* Guard word for task stacks. */
  63 #define STACK_GUARD     ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
  64
  65 /* Magic system structure table addresses. */
  66 #define BEG_PRIV_ADDR              (&priv[0])
  67 #define END_PRIV_ADDR              (&priv[NR_SYS_PROCS])
  68 #define BEG_STATIC_PRIV_ADDR       BEG_PRIV_ADDR
  69 #define END_STATIC_PRIV_ADDR       (BEG_STATIC_PRIV_ADDR + NR_STATIC_PRIV_IDS)
  70 #define BEG_DYN_PRIV_ADDR          END_STATIC_PRIV_ADDR
  71 #define END_DYN_PRIV_ADDR          END_PRIV_ADDR
  72
  73 #define priv_addr(i)      (ppriv_addr)[(i)]
  74 #define priv_id(rp)       ((rp)->p_priv->s_id)
  75 #define priv(rp)          ((rp)->p_priv)
  76
  77 #define id_to_nr(id)    priv_addr(id)->s_proc_nr
  78 #define nr_to_id(nr)    priv(proc_addr(nr))->s_id
  79
  80 #define may_send_to(rp, nr) (get_sys_bit(priv(rp)->s_ipc_to, nr_to_id(nr)))
  81
  82 /* The system structures table and pointers to individual table slots. The
  83  * pointers allow faster access because now a process entry can be found by
  84  * indexing the psys_addr array, while accessing an element i requires a
  85  * multiplication with sizeof(struct sys) to determine the address.
  86  */
  87 EXTERN struct priv priv[NR_SYS_PROCS];          /* system properties table */
  88 EXTERN struct priv *ppriv_addr[NR_SYS_PROCS];   /* direct slot pointers */
  89
  90 /* Make sure the system can boot. The following sanity check verifies that
  91  * the system privileges table is large enough for the number of processes
  92  * in the boot image.
  93  */
  94 #if (NR_BOOT_PROCS > NR_SYS_PROCS)
  95 #error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
  96 #endif
  97
  98 #endif /* PRIV_H */