cb176df60f
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.
93 lines
4.3 KiB
C
93 lines
4.3 KiB
C
/* Global constants used in RS.
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*/
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#ifndef RS_CONST_H
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#define RS_CONST_H
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#define DEBUG_DEFAULT 0
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#ifndef DEBUG
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#define DEBUG DEBUG_DEFAULT
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#endif
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/* Space reserved for program and arguments. */
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#define MAX_COMMAND_LEN 512 /* maximum argument string length */
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#define MAX_SCRIPT_LEN 256 /* maximum restart script name length */
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#define MAX_NR_ARGS 4 /* maximum number of arguments */
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#define MAX_IPC_LIST 256 /* Max size of list for IPC target
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* process names
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*/
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/* Flag values. */
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#define RS_IN_USE 0x001 /* set when process slot is in use */
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#define RS_EXITING 0x002 /* set when exit is expected */
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#define RS_REFRESHING 0x004 /* set when refresh must be done */
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#define RS_NOPINGREPLY 0x008 /* service failed to reply to a ping request */
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#define RS_TERMINATED 0x010 /* service has terminated */
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#define RS_LATEREPLY 0x020 /* no reply sent to RS_DOWN caller yet */
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#define RS_INITIALIZING 0x040 /* set when init is in progress */
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#define RS_UPDATING 0x080 /* set when update is in progress */
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#define RS_ACTIVE 0x100 /* set for the active instance of a service */
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/* Sys flag values. */
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#define SF_CORE_SRV 0x001 /* set for core system services */
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#define SF_SYNCH_BOOT 0X002 /* set when process needs synch boot init */
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#define SF_NEED_COPY 0x004 /* set when process needs copy to restart */
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#define SF_USE_COPY 0x008 /* set when process has a copy in memory */
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/* Constants determining RS period and binary exponential backoff. */
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#define RS_INIT_T 600 /* allow T ticks for init */
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#define RS_DELTA_T 60 /* check every T ticks */
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#define BACKOFF_BITS (sizeof(long)*8) /* bits in backoff field */
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#define MAX_BACKOFF 30 /* max backoff in RS_DELTA_T */
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/* Magic process table addresses. */
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#define BEG_RPROC_ADDR (&rproc[0])
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#define END_RPROC_ADDR (&rproc[NR_SYS_PROCS])
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#define NIL_RPROC ((struct mproc *) 0)
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/* Constants for live update. */
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#define RS_DEFAULT_PREPARE_MAXTIME 2*RS_DELTA_T /* default prepare max time */
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#define RS_MAX_PREPARE_MAXTIME 20*RS_DELTA_T /* max prepare max time */
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/* Definitions for boot info tables. */
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#define NULL_BOOT_NR NR_BOOT_PROCS /* marks a null boot entry */
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#define DEFAULT_BOOT_NR NR_BOOT_PROCS /* marks the default boot entry */
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#define SYS_ALL_C (-1) /* specifies all calls */
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#define SYS_NULL_C (-2) /* marks a null call entry */
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/* Define privilege flags for the various process types. */
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#define SRV_F (SYS_PROC | PREEMPTIBLE) /* system services */
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#define DSRV_F (SRV_F | DYN_PRIV_ID | CHECK_IO_PORT | CHECK_IRQ)
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/* dynamic system services */
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#define VM_F (SYS_PROC) /* vm */
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#define RUSR_F (BILLABLE | PREEMPTIBLE) /* root user proc */
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/* Define system call traps for the various process types. These call masks
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* determine what system call traps a process is allowed to make.
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*/
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#define SRV_T (~0) /* system services */
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#define DSRV_T SRV_T /* dynamic system services */
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#define RUSR_T (1 << SENDREC) /* root user proc */
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/* Send masks determine to whom processes can send messages or notifications. */
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#define SRV_M (~0) /* system services */
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#define RUSR_M \
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( spi_to(PM_PROC_NR) | spi_to(FS_PROC_NR) | spi_to(RS_PROC_NR) \
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| spi_to(VM_PROC_NR) ) /* root user proc */
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/* Define the signal manager for the various process types. */
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#define SRV_SM RS_PROC_NR /* system services */
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#define DSRV_SM RS_PROC_NR /* dynamic system services */
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#define RUSR_SM PM_PROC_NR /* root user proc */
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/* Define sys flags for the various process types. */
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#define SRV_SF (SF_CORE_SRV | SF_NEED_COPY) /* system services */
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#define SRVC_SF (SRV_SF | SF_USE_COPY) /* system services with a copy */
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#define DSRV_SF (0) /* dynamic system services */
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#define VM_SF (SRV_SF | SF_SYNCH_BOOT) /* vm */
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#endif /* RS_CONST_H */
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