minix/kernel/ipc.h
Jorrit Herder ab7c0a9926 Cleaned up table. Moved policies to table.
Small fixes to do_copy, do_privctl and do_fork.
2005-08-02 15:28:09 +00:00

48 lines
2.1 KiB
C

#ifndef IPC_H
#define IPC_H
#include <minix/com.h>
/* Masks and flags for system calls. */
#define SYSCALL_FUNC 0x0F /* mask for system call function */
#define SYSCALL_FLAGS 0xF0 /* mask for system call flags */
#define NON_BLOCKING 0x10 /* prevent blocking, return error */
/* System call numbers that are passed when trapping to the kernel. The
* numbers are carefully defined so that it can easily be seen (based on
* the bits that are on) which checks should be done in sys_call().
*/
#define SEND 1 /* 0 0 0 1 : blocking send */
#define RECEIVE 2 /* 0 0 1 0 : blocking receive */
#define SENDREC 3 /* 0 0 1 1 : SEND + RECEIVE */
#define NOTIFY 4 /* 0 1 0 0 : nonblocking notify */
#define ECHO 8 /* 1 0 0 0 : echo a message */
/* The following bit masks determine what checks that should be done. */
#define CHECK_PTR 0x0B /* 1 0 1 1 : validate message buffer */
#define CHECK_DST 0x05 /* 0 1 0 1 : validate message destination */
#define CHECK_SRC 0x02 /* 0 0 1 0 : validate message source */
/* Send masks determine to whom processes can send messages or notifications.
* The values here are used for the processes in the boot image. We rely on
* the initialization code in main() to match the s_nr_to_id() mapping for the
* processes in the boot image, so that the send mask that is defined here
* can be directly copied onto map[0] of the actual send mask. Privilege
* structure 0 is shared by user processes.
*
* Note that process numbers in the boot image should not be higher than
* "BITCHUNK_BITS - NR_TASKS", because a bitchunk_t field is used to store
* the send masks in the table that describes that processes in the image.
*/
#define s_nr_to_id(n) (NR_TASKS + (n) + 1)
#define s(n) (1 << s_nr_to_id(n))
#define SERV_M (~0)
#define SYST_M (~0)
#define USER_M (s(PM_PROC_NR)|s(FS_PROC_NR)|s(SM_PROC_NR))
#define DRIV_M (USER_M | s(SYSTEM)|s(CLOCK)|s(LOG_PROC_NR)|s(TTY))
/* Sanity check to make sure the send masks can be set. */
extern int dummy[(BITCHUNK_BITS-NR_TASKS > INIT_PROC_NR) ? 1 : -1];
#endif /* IPC_H */