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.
91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
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#ifndef _MINIX_SAFECOPIES_H
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#define _MINIX_SAFECOPIES_H 1
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#include <minix/sys_config.h>
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#include <minix/types.h>
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#include <minix/vm.h>
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#include <stdint.h>
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typedef struct {
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int cp_flags; /* CPF_* below */
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union {
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struct {
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/* CPF_DIRECT */
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endpoint_t cp_who_to; /* grantee */
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vir_bytes cp_start; /* memory */
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size_t cp_len; /* size in bytes */
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char cp_reserved[8]; /* future use */
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} cp_direct;
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struct {
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/* CPF_INDIRECT */
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endpoint_t cp_who_to; /* grantee */
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endpoint_t cp_who_from; /* previous granter */
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cp_grant_id_t cp_grant; /* previous grant */
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char cp_reserved[8];/* future use */
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} cp_indirect;
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struct {
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/* CPF_MAGIC */
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endpoint_t cp_who_from; /* granter */
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endpoint_t cp_who_to; /* grantee */
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vir_bytes cp_start; /* memory */
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size_t cp_len; /* size in bytes */
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char cp_reserved[8]; /* future use */
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} cp_magic;
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} cp_u;
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char cp_reserved[8]; /* future use */
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} cp_grant_t;
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/* Vectored safecopy. */
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struct vscp_vec {
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/* Exactly one of the following must be SELF. */
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endpoint_t v_from; /* source */
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endpoint_t v_to; /* destination */
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cp_grant_id_t v_gid; /* grant id of other process */
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size_t v_offset; /* offset in other grant */
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vir_bytes v_addr; /* address in copier's space */
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size_t v_bytes; /* no. of bytes */
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};
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/* Invalid grant number. */
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#define GRANT_INVALID ((cp_grant_id_t) -1)
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#define GRANT_VALID(g) ((g) > GRANT_INVALID)
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/* Operations: any combination is ok. */
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#define CPF_READ 0x000001 /* Granted process may read. */
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#define CPF_WRITE 0x000002 /* Granted process may write. */
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#define CPF_MAP 0x000004 /* Granted process may map. */
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/* Internal flags. */
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#define CPF_USED 0x000100 /* Grant slot in use. */
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#define CPF_DIRECT 0x000200 /* Grant from this process to another. */
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#define CPF_INDIRECT 0x000400 /* Grant from grant to another. */
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#define CPF_MAGIC 0x000800 /* Grant from any to any. */
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#define CPF_VALID 0x001000 /* Grant slot contains valid grant. */
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/* Prototypes for functions in libsys. */
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_PROTOTYPE( cp_grant_id_t cpf_grant_direct, (endpoint_t, vir_bytes, size_t, int));
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_PROTOTYPE( cp_grant_id_t cpf_grant_indirect, (endpoint_t, endpoint_t, cp_grant_id_t));
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_PROTOTYPE( cp_grant_id_t cpf_grant_magic, (endpoint_t, endpoint_t, vir_bytes, size_t, int));
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_PROTOTYPE( int cpf_revoke, (cp_grant_id_t grant_id));
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_PROTOTYPE( int cpf_lookup, (cp_grant_id_t g, endpoint_t *ep, endpoint_t *ep2));
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_PROTOTYPE( int cpf_getgrants, (cp_grant_id_t *grant_ids, int n));
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_PROTOTYPE( int cpf_setgrant_direct, (cp_grant_id_t g, endpoint_t who,
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vir_bytes addr, size_t size, int access));
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_PROTOTYPE( int cpf_setgrant_indirect, (cp_grant_id_t g, endpoint_t who_to,
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endpoint_t who_from, cp_grant_id_t his_g));
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_PROTOTYPE( int cpf_setgrant_magic, (cp_grant_id_t g, endpoint_t who_to,
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endpoint_t who_from, vir_bytes addr, size_t bytes, int access));
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_PROTOTYPE( int cpf_setgrant_disable, (cp_grant_id_t grant_id));
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_PROTOTYPE( void cpf_reload, (void));
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/* Set a process' grant table location and size (in-kernel only). */
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#define _K_SET_GRANT_TABLE(rp, ptr, entries) \
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priv(rp)->s_grant_table= (ptr); \
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priv(rp)->s_grant_entries= (entries);
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#endif /* _MINIX_SAFECOPIES_H */
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