minix/kernel/sendmask.h

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/* Definition of the 'p_sendmask' bit mask used in the process table. The bit
* mask of process is checked in mini_send() to see if the caller is allowed
* to send to the destination.
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*
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* PLEASE NOTE: the send masks definitions are a mess and must be updated!!!
* this will be done when dynamic driver loading is implemented
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*
* Changes:
* May 01, 2004 created and sendmask definitions (Jorrit N. Herder)
*/
#ifndef SENDMASK_H
#define SENDMASK_H
/* Define type for sendmask, if not already done. */
#include "type.h"
/* Constants to support the bitmask operations. */
#define BIT_0 (send_mask_t) 1
#define MASK_ENTRIES NR_TASKS + (INIT_PROC_NR+1) + 1
#define USER_PROC_NR INIT_PROC_NR+1 /* used to set bit for user procs */
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#define ALLOW_ALL_MASK (send_mask_t) -1
#define DENY_ALL_MASK (send_mask_t) 0
/* Check if given process number is in range. */
#define isvalid(n) ((unsigned) ((n)+NR_TASKS) <= MASK_ENTRIES -1)
/* Default masks and bit operations that easily allow to construct bit masks.
* Note the one always must start with a default mask like allow_all_mask.
* From that point, one can, for example, deny several processes.
*/
#define allow_all_mask ALLOW_ALL_MASK
#define deny_all_mask DENY_ALL_MASK
#define allow(enabled,n) | (enabled << ((n) + NR_TASKS))
#define deny(enabled,n) & ~(enabled << ((n) + NR_TASKS))
#define send_mask_allow(mask,n) ((mask) |= (1 << ((n) + NR_TASKS)))
#define send_mask_deny(mask,n) ((mask) &= ~(1 << ((n) + NR_TASKS)))
/* Check if the bit for the given process number is set. */
#define isallowed(mask,n) ((mask) & (BIT_0 << ((n) + NR_TASKS)))
/* The masks below match the processes (and order) in src/kernel/table.c.
* Note that the masks are made effective the inclusion in the task table
* which is used to set up the process table on start up.
*/
#define TTY_SENDMASK \
allow_all_mask
#define DP8390_SENDMASK \
allow_all_mask
#define RTL8139_SENDMASK \
allow_all_mask
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#define IDLE_SENDMASK \
deny_all_mask
/* The tasktab in src/kernel/table.c supports up to 4 controllers
* it is possible to define separate masks for them here, but then
* a small update in table.c is required to make them effective
*/
#define CTRLR_SENDMASK \
allow_all_mask
#define SB16DSP_SENDMASK \
allow_all_mask
#define SB16MIX_SENDMASK \
allow_all_mask
#define FLOPPY_SENDMASK \
allow_all_mask
#define CLOCK_SENDMASK \
allow_all_mask
#define SYSTEM_SENDMASK \
allow_all_mask
#define HARDWARE_SENDMASK \
allow_all_mask \
deny(1, USER_PROC_NR)
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#define PM_SENDMASK \
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deny_all_mask \
allow(1, IS_PROC_NR) /* output diagnostics */ \
allow(1, SYSTASK) \
allow(1, TTY) \
allow(1, CLOCK) \
allow(1, INIT_PROC_NR) \
allow(1, FS_PROC_NR) \
allow(1, USER_PROC_NR) /* reply to system calls */
#define AT_SENDMASK \
allow_all_mask
#define FS_SENDMASK \
allow_all_mask
#if 0
deny_all_mask \
allow(1, IS_PROC_NR) /* output diagnostics */ \
allow(1, SYSTASK) /* need system functionality */ \
allow(1, CLOCK) /* need clock functionality */ \
allow(1, IS_PROC_NR) /* output diagnostics */ \
allow(1, TTY) /* a.o. observe function keys */ \
allow(1, FLOPPY) \
allow(ENABLE_SB16, SB16DSP ) \
allow(ENABLE_SB16, SB16MIX ) \
allow(ENABLE_PRINTER, PRINTER ) \
allow(1, MEMORY ) \
allow((NR_CTRLRS >= 1), CTRLR(0)) \
allow((NR_CTRLRS >= 2), CTRLR(1)) \
allow((NR_CTRLRS >= 3), CTRLR(2)) \
allow((NR_CTRLRS >= 4), CTRLR(3)) \
allow(1, INIT_PROC_NR) \
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allow(1, PM_PROC_NR) /* cooperates with process manager */ \
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allow(1, USER_PROC_NR) /* reply to system calls */
#endif
#define IS_SENDMASK \
allow_all_mask /* IS handles all diagnostic messages */
#if 0
deny_all_mask \
allow(1, CLOCK) /* clock delays and flag alarm needed */ \
allow(1, FS_PROC_NR) /* open /dev/mem to read CMOS clock */ \
allow(1, SYSTASK) /* copy tables from kernel space */ \
allow(1, TTY) /* request function key notifications */ \
allow(1, USER_PROC_NR) /* reply to system calls */
#endif
#define MEM_SENDMASK \
deny_all_mask \
allow(1, IS_PROC_NR) /* output diagnostics */ \
allow(1, SYSTASK) /* system functionality needed */ \
allow(1, CLOCK) /* check clock alarms */ \
allow(1, TTY) /* output diagnostics */ \
allow(1, FS_PROC_NR) /* FS is interface to the driver */
#define PRN_SENDMASK \
deny_all_mask \
allow(1, IS_PROC_NR) /* output diagnostics */ \
allow(1, SYSTASK) /* device port I/O needed */ \
allow(1, TTY) /* output diagnostics */ \
allow(1, CLOCK) /* need small delays */ \
allow(1, FS_PROC_NR) /* FS is interface to the driver */
#define FXP_SENDMASK \
allow_all_mask
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#define INIT_SENDMASK \
deny_all_mask \
allow(1, FS_PROC_NR) /* init makes system calls to FS and MM */ \
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allow(1, PM_PROC_NR)
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#define USER_PROC_SENDMASK \
deny_all_mask \
allow(1, FS_PROC_NR) /* users can only make system calls */ \
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allow(1, PM_PROC_NR) \
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allow(1, IS_PROC_NR) \
allow(ENABLE_TASKSERVER, TS_PROC_NR)
#endif /* SENDMASK_H */