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minix/kernel/system.h
Tomas Hruby cca24d06d8 This patch removes the global variables who_p and who_e from the 
kernel (sys task).  The main reason is that these would have to become
cpu local variables on SMP.  Once the system task is not a task but a
genuine part of the kernel there is even less reason to have these
extra variables as proc_ptr will already contain all neccessary
information. In addition converting who_e to the process pointer and
back again all the time will be avoided.

Although proc_ptr will contain all important information, accessing it
as a cpu local variable will be fairly expensive, hence the value
would be assigned to some on stack local variable. Therefore it is
better to add the 'caller' argument to the syscall handlers to pass
the value on stack anyway. It also clearly denotes on who's behalf is
the syscall being executed.

This patch also ANSIfies the syscall function headers.

Last but not least, it also fixes a potential bug in virtual_copy_f()
in case the check is disabled. So far the function in case of a
failure could possible reuse an old who_p in case this function had
not been called from the system task.

virtual_copy_f() takes the caller as a parameter too. In case the
checking is disabled, the caller must be NULL and non NULL if it is
enabled as we must be able to suspend the caller.
2010-02-03 09:04:48 +00:00

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/* Function prototypes for the system library. The prototypes in this file
* are undefined to do_unused if the kernel call is not enabled in config.h.
* The implementation is contained in src/kernel/system/.
*
* The system library allows to access system services by doing a kernel call.
* System calls are transformed into request messages to the SYS task that is
* responsible for handling the call. By convention, sys_call() is transformed
* into a message with type SYS_CALL that is handled in a function do_call().
*
* Changes:
* Jul 30, 2005 created SYS_INT86 to support BIOS driver (Philip Homburg)
* Jul 13, 2005 created SYS_PRIVCTL to manage services (Jorrit N. Herder)
* Jul 09, 2005 updated SYS_KILL to signal services (Jorrit N. Herder)
* Jun 21, 2005 created SYS_NICE for nice(2) kernel call (Ben J. Gras)
* Jun 21, 2005 created SYS_MEMSET to speed up exec(2) (Ben J. Gras)
* Jan 20, 2005 updated SYS_COPY for virtual_copy() (Jorrit N. Herder)
* Oct 24, 2004 created SYS_GETKSIG to support PM (Jorrit N. Herder)
* Oct 10, 2004 created handler for unused calls (Jorrit N. Herder)
* Sep 09, 2004 updated SYS_EXIT to let services exit (Jorrit N. Herder)
* Aug 25, 2004 rewrote SYS_SETALARM to clean up code (Jorrit N. Herder)
* Jul 13, 2004 created SYS_SEGCTL to support drivers (Jorrit N. Herder)
* May 24, 2004 created SYS_SDEVIO to support drivers (Jorrit N. Herder)
* May 24, 2004 created SYS_GETINFO to retrieve info (Jorrit N. Herder)
* Apr 18, 2004 created SYS_VDEVIO to support drivers (Jorrit N. Herder)
* Feb 24, 2004 created SYS_IRQCTL to support drivers (Jorrit N. Herder)
* Feb 02, 2004 created SYS_DEVIO to support drivers (Jorrit N. Herder)
*/
#ifndef SYSTEM_H
#define SYSTEM_H
/* Common includes for the system library. */
#include "debug.h"
#include "kernel.h"
#include "proto.h"
#include "proc.h"
/* Default handler for unused kernel calls. */
_PROTOTYPE( int do_unused, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_exec, (struct proc * caller, message *m_ptr) );
#if ! USE_EXEC
#define do_exec do_unused
#endif
_PROTOTYPE( int do_fork, (struct proc * caller, message *m_ptr) );
#if ! USE_FORK
#define do_fork do_unused
#endif
_PROTOTYPE( int do_newmap, (struct proc * caller, message *m_ptr) );
#if ! USE_NEWMAP
#define do_newmap do_unused
#endif
_PROTOTYPE( int do_exit, (struct proc * caller, message *m_ptr) );
#if ! USE_EXIT
#define do_exit do_unused
#endif
_PROTOTYPE( int do_trace, (struct proc * caller, message *m_ptr) );
#if ! USE_TRACE
#define do_trace do_unused
#endif
_PROTOTYPE( int do_nice, (struct proc * caller, message *m_ptr) );
#if ! USE_NICE
#define do_nice do_unused
#endif
_PROTOTYPE( int do_runctl, (struct proc * caller, message *m_ptr) );
#if ! USE_RUNCTL
#define do_runctl do_unused
#endif
_PROTOTYPE( int do_copy, (struct proc * caller, message *m_ptr) );
#define do_vircopy do_copy
#if ! (USE_VIRCOPY || USE_PHYSCOPY)
#define do_copy do_unused
#endif
_PROTOTYPE( int do_umap, (struct proc * caller, message *m_ptr) );
#if ! USE_UMAP
#define do_umap do_unused
#endif
_PROTOTYPE( int do_memset, (struct proc * caller, message *m_ptr) );
#if ! USE_MEMSET
#define do_memset do_unused
#endif
_PROTOTYPE( int do_abort, (struct proc * caller, message *m_ptr) );
#if ! USE_ABORT
#define do_abort do_unused
#endif
_PROTOTYPE( int do_getinfo, (struct proc * caller, message *m_ptr) );
#if ! USE_GETINFO
#define do_getinfo do_unused
#endif
_PROTOTYPE( int do_privctl, (struct proc * caller, message *m_ptr) );
#if ! USE_PRIVCTL
#define do_privctl do_unused
#endif
_PROTOTYPE( int do_segctl, (struct proc * caller, message *m_ptr) );
#if ! USE_SEGCTL
#define do_segctl do_unused
#endif
_PROTOTYPE( int do_irqctl, (struct proc * caller, message *m_ptr) );
#if ! USE_IRQCTL
#define do_irqctl do_unused
#endif
_PROTOTYPE( int do_devio, (struct proc * caller, message *m_ptr) );
#if ! USE_DEVIO
#define do_devio do_unused
#endif
_PROTOTYPE( int do_vdevio, (struct proc * caller, message *m_ptr) );
#if ! USE_VDEVIO
#define do_vdevio do_unused
#endif
_PROTOTYPE( int do_int86, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_sdevio, (struct proc * caller, message *m_ptr) );
#if ! USE_SDEVIO
#define do_sdevio do_unused
#endif
_PROTOTYPE( int do_kill, (struct proc * caller, message *m_ptr) );
#if ! USE_KILL
#define do_kill do_unused
#endif
_PROTOTYPE( int do_getksig, (struct proc * caller, message *m_ptr) );
#if ! USE_GETKSIG
#define do_getksig do_unused
#endif
_PROTOTYPE( int do_endksig, (struct proc * caller, message *m_ptr) );
#if ! USE_ENDKSIG
#define do_endksig do_unused
#endif
_PROTOTYPE( int do_sigsend, (struct proc * caller, message *m_ptr) );
#if ! USE_SIGSEND
#define do_sigsend do_unused
#endif
_PROTOTYPE( int do_sigreturn, (struct proc * caller, message *m_ptr) );
#if ! USE_SIGRETURN
#define do_sigreturn do_unused
#endif
_PROTOTYPE( int do_times, (struct proc * caller, message *m_ptr) );
#if ! USE_TIMES
#define do_times do_unused
#endif
_PROTOTYPE( int do_setalarm, (struct proc * caller, message *m_ptr) );
#if ! USE_SETALARM
#define do_setalarm do_unused
#endif
_PROTOTYPE( int do_stime, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_vtimer, (struct proc * caller, message *m_ptr) );
#if ! USE_VTIMER
#define do_vtimer do_unused
#endif
_PROTOTYPE( int do_safecopy, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_vsafecopy, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_iopenable, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_vmctl, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_setgrant, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_readbios, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_safemap, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_saferevmap, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_safeunmap, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_sprofile, (struct proc * caller, message *m_ptr) );
#if ! SPROFILE
#define do_sprofile do_unused
#endif
_PROTOTYPE( int do_cprofile, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_profbuf, (struct proc * caller, message *m_ptr) );
#endif /* SYSTEM_H */
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