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minix/kernel/system.h
Cristiano Giuffrida cb176df60f New RS and new signal handling for system processes. 
UPDATING INFO:
20100317:
        /usr/src/etc/system.conf updated to ignore default kernel calls: copy
        it (or merge it) to /etc/system.conf.
        The hello driver (/dev/hello) added to the distribution:
        # cd /usr/src/commands/scripts && make clean install
        # cd /dev && MAKEDEV hello

KERNEL CHANGES:
- Generic signal handling support. The kernel no longer assumes PM as a signal
manager for every process. The signal manager of a given process can now be
specified in its privilege slot. When a signal has to be delivered, the kernel
performs the lookup and forwards the signal to the appropriate signal manager.
PM is the default signal manager for user processes, RS is the default signal
manager for system processes. To enable ptrace()ing for system processes, it
is sufficient to change the default signal manager to PM. This will temporarily
disable crash recovery, though.
- sys_exit() is now split into sys_exit() (i.e. exit() for system processes,
which generates a self-termination signal), and sys_clear() (i.e. used by PM
to ask the kernel to clear a process slot when a process exits).
- Added a new kernel call (i.e. sys_update()) to swap two process slots and
implement live update.

PM CHANGES:
- Posix signal handling is no longer allowed for system processes. System
signals are split into two fixed categories: termination and non-termination
signals. When a non-termination signaled is processed, PM transforms the signal
into an IPC message and delivers the message to the system process. When a
termination signal is processed, PM terminates the process.
- PM no longer assumes itself as the signal manager for system processes. It now
makes sure that every system signal goes through the kernel before being
actually processes. The kernel will then dispatch the signal to the appropriate
signal manager which may or may not be PM.

SYSLIB CHANGES:
- Simplified SEF init and LU callbacks.
- Added additional predefined SEF callbacks to debug crash recovery and
live update.
- Fixed a temporary ack in the SEF init protocol. SEF init reply is now
completely synchronous.
- Added SEF signal event type to provide a uniform interface for system
processes to deal with signals. A sef_cb_signal_handler() callback is
available for system processes to handle every received signal. A
sef_cb_signal_manager() callback is used by signal managers to process
system signals on behalf of the kernel.
- Fixed a few bugs with memory mapping and DS.

VM CHANGES:
- Page faults and memory requests coming from the kernel are now implemented
using signals.
- Added a new VM call to swap two process slots and implement live update.
- The call is used by RS at update time and in turn invokes the kernel call
sys_update().

RS CHANGES:
- RS has been reworked with a better functional decomposition.
- Better kernel call masks. com.h now defines the set of very basic kernel calls
every system service is allowed to use. This makes system.conf simpler and
easier to maintain. In addition, this guarantees a higher level of isolation
for system libraries that use one or more kernel calls internally (e.g. printf).
- RS is the default signal manager for system processes. By default, RS
intercepts every signal delivered to every system process. This makes crash
recovery possible before bringing PM and friends in the loop.
- RS now supports fast rollback when something goes wrong while initializing
the new version during a live update.
- Live update is now implemented by keeping the two versions side-by-side and
swapping the process slots when the old version is ready to update.
- Crash recovery is now implemented by keeping the two versions side-by-side
and cleaning up the old version only when the recovery process is complete.

DS CHANGES:
- Fixed a bug when the process doing ds_publish() or ds_delete() is not known
by DS.
- Fixed the completely broken support for strings. String publishing is now
implemented in the system library and simply wraps publishing of memory ranges.
Ideally, we should adopt a similar approach for other data types as well.
- Test suite fixed.

DRIVER CHANGES:
- The hello driver has been added to the Minix distribution to demonstrate basic
live update and crash recovery functionalities.
- Other drivers have been adapted to conform the new SEF interface.
2010-03-17 01:15:29 +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:
* Mar 01, 2010 SYS_CLEAR and SYS_EXIT split (Cristiano Giuffrida)
* 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_clear, (struct proc * caller, message *m_ptr) );
#if ! USE_CLEAR
#define do_clear 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_update, (struct proc * caller, message *m_ptr) );
#if ! USE_UPDATE
#define do_update 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_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) );
_PROTOTYPE( int do_getmcontext, (struct proc * caller, message *m_ptr) );
_PROTOTYPE( int do_setmcontext, (struct proc * caller, message *m_ptr) );
#if ! USE_MCONTEXT
#define do_getmcontext do_unused
#define do_setmcontext do_unused
#endif
#endif /* SYSTEM_H */
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