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phunix/include/minix/sef.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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/* Prototypes for System Event Framework (SEF) functions. */
#ifndef _SEF_H
#define _SEF_H
#include <minix/ipc.h>
/* SEF entry points for system processes. */
_PROTOTYPE( void sef_startup, (void) );
_PROTOTYPE( int sef_receive, (endpoint_t src, message *m_ptr) );
_PROTOTYPE( void sef_exit, (int status) );
/* SEF Debug. */
#include <stdio.h>
#define sef_dprint printf
#define sef_debug_begin() (void)(NULL)
#define sef_debug_end() fflush(stdout)
/*===========================================================================*
* SEF Init *
*===========================================================================*/
/* What to intercept. */
#define INTERCEPT_SEF_INIT_REQUESTS 1
#define IS_SEF_INIT_REQUEST(mp) ((mp)->m_type == RS_INIT \
&& (mp)->m_source == RS_PROC_NR)
/* Type definitions. */
typedef struct {
cp_grant_id_t rproctab_gid;
} sef_init_info_t;
/* Callback type definitions. */
typedef int(*sef_cb_init_t)(int type, sef_init_info_t *info);
/* Callback registration helpers. */
_PROTOTYPE( void sef_setcb_init_fresh, (sef_cb_init_t cb));
_PROTOTYPE( void sef_setcb_init_lu, (sef_cb_init_t cb));
_PROTOTYPE( void sef_setcb_init_restart, (sef_cb_init_t cb));
/* Predefined callback implementations. */
_PROTOTYPE( int sef_cb_init_null, (int type, sef_init_info_t *info) );
_PROTOTYPE( int sef_cb_init_fail, (int type, sef_init_info_t *info) );
_PROTOTYPE( int sef_cb_init_crash, (int type, sef_init_info_t *info) );
/* Macros for predefined callback implementations. */
#define SEF_CB_INIT_FRESH_NULL sef_cb_init_null
#define SEF_CB_INIT_LU_NULL sef_cb_init_null
#define SEF_CB_INIT_RESTART_NULL sef_cb_init_null
#define SEF_CB_INIT_FRESH_DEFAULT sef_cb_init_null
#define SEF_CB_INIT_LU_DEFAULT sef_cb_init_null
#define SEF_CB_INIT_RESTART_DEFAULT sef_cb_init_null
/* Init types. */
#define SEF_INIT_FRESH 0 /* init fresh */
#define SEF_INIT_LU 1 /* init after live update */
#define SEF_INIT_RESTART 2 /* init after restart */
/* Debug. */
#define SEF_INIT_DEBUG_DEFAULT 0
#ifndef SEF_INIT_DEBUG
#define SEF_INIT_DEBUG SEF_INIT_DEBUG_DEFAULT
#endif
#define sef_init_dprint sef_dprint
#define sef_init_debug_begin sef_debug_begin
#define sef_init_debug_end sef_debug_end
/*===========================================================================*
* SEF Ping *
*===========================================================================*/
/* What to intercept. */
#define INTERCEPT_SEF_PING_REQUESTS 1
#define IS_SEF_PING_REQUEST(mp) (is_notify((mp)->m_type) \
&& (mp)->m_source == RS_PROC_NR)
/* Callback type definitions. */
typedef void(*sef_cb_ping_reply_t)(endpoint_t source);
/* Callback registration helpers. */
_PROTOTYPE( void sef_setcb_ping_reply, (sef_cb_ping_reply_t cb));
/* Predefined callback implementations. */
_PROTOTYPE( void sef_cb_ping_reply_null, (endpoint_t source) );
_PROTOTYPE( void sef_cb_ping_reply_pong, (endpoint_t source) );
/* Macros for predefined callback implementations. */
#define SEF_CB_PING_REPLY_NULL sef_cb_ping_reply_null
#define SEF_CB_PING_REPLY_DEFAULT sef_cb_ping_reply_pong
/* Debug. */
#define SEF_PING_DEBUG_DEFAULT 0
#ifndef SEF_PING_DEBUG
#define SEF_PING_DEBUG SEF_PING_DEBUG_DEFAULT
#endif
#define sef_ping_dprint sef_dprint
#define sef_ping_debug_begin sef_debug_begin
#define sef_ping_debug_end sef_debug_end
/*===========================================================================*
* SEF Live update *
*===========================================================================*/
/* What to intercept. */
#define INTERCEPT_SEF_LU_REQUESTS 1
#define IS_SEF_LU_REQUEST(mp) ((mp)->m_type == RS_LU_PREPARE \
&& (mp)->m_source == RS_PROC_NR)
/* Callback type definitions. */
typedef int(*sef_cb_lu_prepare_t)(int);
typedef int(*sef_cb_lu_state_isvalid_t)(int);
typedef void(*sef_cb_lu_state_changed_t)(int, int);
typedef void(*sef_cb_lu_state_dump_t)(int);
typedef int(*sef_cb_lu_state_save_t)(int);
/* Callback registration helpers. */
_PROTOTYPE( void sef_setcb_lu_prepare, (sef_cb_lu_prepare_t cb) );
_PROTOTYPE( void sef_setcb_lu_state_isvalid, (sef_cb_lu_state_isvalid_t cb) );
_PROTOTYPE( void sef_setcb_lu_state_changed, (sef_cb_lu_state_changed_t cb) );
_PROTOTYPE( void sef_setcb_lu_state_dump, (sef_cb_lu_state_dump_t cb) );
_PROTOTYPE( void sef_setcb_lu_state_save, (sef_cb_lu_state_save_t cb) );
/* Predefined callback implementations. */
_PROTOTYPE( int sef_cb_lu_prepare_null, (int state) );
_PROTOTYPE( int sef_cb_lu_state_isvalid_null, (int state) );
_PROTOTYPE( void sef_cb_lu_state_changed_null, (int old_state, int state) );
_PROTOTYPE( void sef_cb_lu_state_dump_null, (int state) );
_PROTOTYPE( int sef_cb_lu_state_save_null, (int state) );
_PROTOTYPE( int sef_cb_lu_prepare_always_ready, (int state) );
_PROTOTYPE( int sef_cb_lu_prepare_never_ready, (int state) );
_PROTOTYPE( int sef_cb_lu_prepare_crash, (int state) );
_PROTOTYPE( int sef_cb_lu_state_isvalid_standard, (int state) );
/* Macros for predefined callback implementations. */
#define SEF_CB_LU_PREPARE_NULL sef_cb_lu_prepare_null
#define SEF_CB_LU_STATE_ISVALID_NULL sef_cb_lu_state_isvalid_null
#define SEF_CB_LU_STATE_CHANGED_NULL sef_cb_lu_state_changed_null
#define SEF_CB_LU_STATE_DUMP_NULL sef_cb_lu_state_dump_null
#define SEF_CB_LU_STATE_SAVE_NULL sef_cb_lu_state_save_null
#define SEF_CB_LU_PREPARE_DEFAULT sef_cb_lu_prepare_null
#define SEF_CB_LU_STATE_ISVALID_DEFAULT sef_cb_lu_state_isvalid_null
#define SEF_CB_LU_STATE_CHANGED_DEFAULT sef_cb_lu_state_changed_null
#define SEF_CB_LU_STATE_DUMP_DEFAULT sef_cb_lu_state_dump_null
#define SEF_CB_LU_STATE_SAVE_DEFAULT sef_cb_lu_state_save_null
/* Standard live update states. */
#define SEF_LU_STATE_NULL 0 /* null state */
#define SEF_LU_STATE_WORK_FREE 1 /* no work in progress */
#define SEF_LU_STATE_REQUEST_FREE 2 /* no request in progress */
#define SEF_LU_STATE_PROTOCOL_FREE 3 /* no protocol in progress */
#define SEF_LU_STATE_CUSTOM_BASE (SEF_LU_STATE_PROTOCOL_FREE+1)
#define SEF_LU_STATE_IS_STANDARD(s) ((s) > SEF_LU_STATE_NULL \
&& (s) < SEF_LU_STATE_CUSTOM_BASE)
/* Debug. */
#define SEF_LU_DEBUG_DEFAULT 1
#ifndef SEF_LU_DEBUG
#define SEF_LU_DEBUG SEF_LU_DEBUG_DEFAULT
#endif
#define sef_lu_dprint sef_dprint
#define sef_lu_debug_begin sef_debug_begin
#define sef_lu_debug_end sef_debug_end
/*===========================================================================*
* SEF Signal *
*===========================================================================*/
/* What to intercept. */
#define INTERCEPT_SEF_SIGNAL_REQUESTS 1
#define IS_SEF_SIGNAL_REQUEST(mp) \
(((mp)->m_type == SIGS_SIGNAL_RECEIVED && (mp)->m_source < INIT_PROC_NR) \
|| (is_notify((mp)->m_type) && (mp)->m_source == SYSTEM))
/* Callback type definitions. */
typedef void(*sef_cb_signal_handler_t)(int signo);
typedef int(*sef_cb_signal_manager_t)(endpoint_t target, int signo);
/* Callback registration helpers. */
_PROTOTYPE( void sef_setcb_signal_handler, (sef_cb_signal_handler_t cb));
_PROTOTYPE( void sef_setcb_signal_manager, (sef_cb_signal_manager_t cb));
/* Predefined callback implementations. */
_PROTOTYPE( void sef_cb_signal_handler_null, (int signo) );
_PROTOTYPE( int sef_cb_signal_manager_null, (endpoint_t target, int signo) );
_PROTOTYPE( void sef_cb_signal_handler_term, (int signo) );
_PROTOTYPE( void sef_cb_signal_handler_posix_default, (int signo) );
/* Macros for predefined callback implementations. */
#define SEF_CB_SIGNAL_HANDLER_NULL sef_cb_signal_handler_null
#define SEF_CB_SIGNAL_MANAGER_NULL sef_cb_signal_manager_null
#define SEF_CB_SIGNAL_HANDLER_DEFAULT sef_cb_signal_handler_null
#define SEF_CB_SIGNAL_MANAGER_DEFAULT sef_cb_signal_manager_null
/* Debug. */
#define SEF_SIGNAL_DEBUG_DEFAULT 0
#ifndef SEF_SIGNAL_DEBUG
#define SEF_SIGNAL_DEBUG SEF_SIGNAL_DEBUG_DEFAULT
#endif
#define sef_signal_dprint sef_dprint
#define sef_signal_debug_begin sef_debug_begin
#define sef_signal_debug_end sef_debug_end
#endif /* _SEF_H */
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