f4574783dc
KERNEL CHANGES: - The kernel only knows about privileges of kernel tasks and the root system process (now RS). - Kernel tasks and the root system process are the only processes that are made schedulable by the kernel at startup. All the other processes in the boot image don't get their privileges set at startup and are inhibited from running by the RTS_NO_PRIV flag. - Removed the assumption on the ordering of processes in the boot image table. System processes can now appear in any order in the boot image table. - Privilege ids can now be assigned both statically or dynamically. The kernel assigns static privilege ids to kernel tasks and the root system process. Each id is directly derived from the process number. - User processes now all share the static privilege id of the root user process (now INIT). - sys_privctl split: we have more calls now to let RS set privileges for system processes. SYS_PRIV_ALLOW / SYS_PRIV_DISALLOW are only used to flip the RTS_NO_PRIV flag and allow / disallow a process from running. SYS_PRIV_SET_SYS / SYS_PRIV_SET_USER are used to set privileges for a system / user process. - boot image table flags split: PROC_FULLVM is the only flag that has been moved out of the privilege flags and is still maintained in the boot image table. All the other privilege flags are out of the kernel now. RS CHANGES: - RS is the only user-space process who gets to run right after in-kernel startup. - RS uses the boot image table from the kernel and three additional boot image info table (priv table, sys table, dev table) to complete the initialization of the system. - RS checks that the entries in the priv table match the entries in the boot image table to make sure that every process in the boot image gets schedulable. - RS only uses static privilege ids to set privileges for system services in the boot image. - RS includes basic memory management support to allocate the boot image buffer dynamically during initialization. The buffer shall contain the executable image of all the system services we would like to restart after a crash. - First step towards decoupling between resource provisioning and resource requirements in RS: RS must know what resources it needs to restart a process and what resources it has currently available. This is useful to tradeoff reliability and resource consumption. When required resources are missing, the process cannot be restarted. In that case, in the future, a system flag will tell RS what to do. For example, if CORE_PROC is set, RS should trigger a system-wide panic because the system can no longer function correctly without a core system process. PM CHANGES: - The process tree built at initialization time is changed to have INIT as root with pid 0, RS child of INIT and all the system services children of RS. This is required to make RS in control of all the system services. - PM no longer registers labels for system services in the boot image. This is now part of RS's initialization process.
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
#ifndef TYPE_H
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#define TYPE_H
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#include <minix/com.h>
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#include <ibm/interrupt.h>
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typedef _PROTOTYPE( void task_t, (void) );
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/* Process table and system property related types. */
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typedef int proc_nr_t; /* process table entry number */
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typedef short sys_id_t; /* system process index */
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typedef struct { /* bitmap for system indexes */
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bitchunk_t chunk[BITMAP_CHUNKS(NR_SYS_PROCS)];
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} sys_map_t;
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struct boot_image {
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proc_nr_t proc_nr; /* process number to use */
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task_t *initial_pc; /* start function for tasks */
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int flags; /* process flags */
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unsigned char quantum; /* quantum (tick count) */
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int priority; /* scheduling priority */
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int stksize; /* stack size for tasks */
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char proc_name[P_NAME_LEN]; /* name in process table */
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endpoint_t endpoint; /* endpoint number when started */
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};
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typedef unsigned long irq_policy_t;
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typedef unsigned long irq_id_t;
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typedef struct irq_hook {
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struct irq_hook *next; /* next hook in chain */
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int (*handler)(struct irq_hook *); /* interrupt handler */
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int irq; /* IRQ vector number */
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int id; /* id of this hook */
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int proc_nr_e; /* (endpoint) NONE if not in use */
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irq_id_t notify_id; /* id to return on interrupt */
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irq_policy_t policy; /* bit mask for policy */
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} irq_hook_t;
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typedef int (*irq_handler_t)(struct irq_hook *);
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#endif /* TYPE_H */
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