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Jorrit Herder
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85
kernel/config.h
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kernel/config.h
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#ifndef CONFIG_H
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#define CONFIG_H
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/* This file defines the kernel configuration. It allows to set sizes of some
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* kernel buffers and to enable or disable debugging code, timing features,
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* and individual kernel calls.
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*
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* Created: Jul 11, 2005 Jorrit N. Herder
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*/
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/* In embedded and sensor applications, not all the kernel calls may be
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* needed. In this section you can specify which kernel calls are needed
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* and which are not. The code for unneeded kernel calls is not included in
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* the system binary, making it smaller. If you are not sure, it is best
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* to keep all kernel calls enabled.
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*/
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#define USE_FORK 1 /* fork a new process */
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#define USE_NEWMAP 1 /* set a new memory map */
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#define USE_EXEC 1 /* update process after execute */
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#define USE_EXIT 1 /* clean up after process exit */
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#define USE_TRACE 1 /* process information and tracing */
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#define USE_GETKSIG 1 /* retrieve pending kernel signals */
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#define USE_ENDKSIG 1 /* finish pending kernel signals */
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#define USE_KILL 1 /* send a signal to a process */
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#define USE_SIGSEND 1 /* send POSIX-style signal */
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#define USE_SIGRETURN 1 /* sys_sigreturn(proc_nr, ctxt_ptr, flags) */
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#define USE_ABORT 1 /* shut down MINIX */
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#define USE_GETINFO 1 /* retrieve a copy of kernel data */
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#define USE_TIMES 1 /* get process and system time info */
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#define USE_SETALARM 1 /* schedule a synchronous alarm */
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#define USE_DEVIO 1 /* read or write a single I/O port */
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#define USE_VDEVIO 1 /* process vector with I/O requests */
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#define USE_SDEVIO 1 /* perform I/O request on a buffer */
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#define USE_IRQCTL 1 /* set an interrupt policy */
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#define USE_SEGCTL 1 /* set up a remote segment */
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#define USE_SVRCTL 1 /* system server control */
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#define USE_SCHEDCTL 1 /* change scheduling priority (nice) */
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#define USE_UMAP 1 /* map virtual to physical address */
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#define USE_VIRCOPY 1 /* copy using virtual addressing */
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#define USE_VIRVCOPY 1 /* vector with virtual copy requests */
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#define USE_PHYSCOPY 1 /* copy using physical addressing */
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#define USE_PHYSVCOPY 1 /* vector with physical copy requests */
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#define USE_MEMSET 1 /* write char to a given memory area */
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/* Length of program names stored in the process table. This is only used
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* for the debugging dumps that can be generated with the IS server. The PM
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* server keeps its own copy of the program name.
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*/
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#define P_NAME_LEN 8
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/* Kernel diagnostics are written to a circular buffer. After each message,
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* a system server is notified and a copy of the buffer can be retrieved to
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* display the message. The buffers size can safely be reduced.
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*/
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#define KMESS_BUF_SIZE 128
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/* Buffer to gather randomness. This is used to generate a random stream by
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* the MEMORY driver when reading from /dev/random.
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*/
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#define RANDOM_ELEMENTS 64
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/* This section contains defines for valuable system resources that are used
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* by device drivers. The number of elements of the vectors is determined by
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* the maximum needed by any given driver. The number of interrupt hooks may
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* be incremented on systems with many device drivers.
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*/
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#define NR_IRQ_HOOKS 16 /* number of interrupt hooks */
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#define VDEVIO_BUF_SIZE 64 /* max elements per VDEVIO request */
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#define VCOPY_VEC_SIZE 16 /* max elements per VCOPY request */
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/* How many buffers for notification messages should there be? */
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#define NR_NOTIFY_BUFS 32
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/* This section allows to enable kernel debugging and timing functionality.
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* For normal operation all options should be disabled.
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*/
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#define DEBUG_SCHED_CHECK 0 /* sanity check of scheduling queues */
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#define DEBUG_LOCK_CHECK 0 /* kernel lock() sanity check */
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#define DEBUG_TIME_LOCKS 0 /* measure time spent in locks */
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#endif /* CONFIG_H */
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71
kernel/priv.h
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kernel/priv.h
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#ifndef PRIV_H
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#define PRIV_H
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/* Declaration of the system privileges structure. It defines flags, system
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* call masks, an synchronous alarm timer, I/O privileges, pending hardware
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* interrupts and notifications, and so on.
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* System processes each get their own structure with properties, whereas all
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* user processes share one structure. This setup provides a clear separation
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* between common and privileged process fields and is very space efficient.
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*
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* Created: Jul 1, 2005 Jorrit N. Herder
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*/
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#include <minix/com.h>
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#include "protect.h"
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#include "const.h"
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#include "type.h"
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struct priv {
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proc_nr_t s_proc_nr; /* number of associated process */
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sys_id_t s_id; /* index of this system structure */
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char s_flags; /* PREEMTIBLE, BILLABLE, etc. */
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char s_call_mask; /* allowed system call traps */
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sys_map_t s_send_mask; /* allowed send destinations */
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long s_sys_mask; /* allowed kernel calls */
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sys_map_t s_notify_pending; /* bit map with pending notifications */
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short s_int_pending; /* pending hardware interrupts */
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timer_t s_alarm_timer; /* synchronous alarm timer */
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struct far_mem s_farmem[NR_REMOTE_SEGS]; /* remote memory map */
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reg_t *s_stack_guard; /* stack guard word for kernel tasks */
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};
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/* Guard word for task stacks. */
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#define STACK_GUARD ((reg_t) (sizeof(reg_t) == 2 ? 0xBEEF : 0xDEADBEEF))
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/* Bits for the system property flags. */
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#define PREEMPTIBLE 0x01 /* kernel tasks are not preemptible */
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#define RDY_Q_HEAD 0x02 /* add to queue head instead of tail */
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#define BILLABLE 0x04 /* some processes are not billable */
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#define SYS_PROC 0x10 /* system processes are privileged */
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/* Magic system structure table addresses. */
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#define BEG_PRIV_ADDR (&priv[0])
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#define END_PRIV_ADDR (&priv[NR_SYS_PROCS])
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#define priv_addr(i) (ppriv_addr)[(i)]
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#define priv_id(rp) ((rp)->p_priv->s_id)
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#define priv(rp) ((rp)->p_priv)
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#define id_to_nr(id) priv_addr(id)->s_proc_nr;
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#define nr_to_id(nr) priv(proc_addr(nr))->s_id;
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/* The system structures table and pointers to individual table slots. The
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* pointers allow faster access because now a process entry can be found by
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* indexing the psys_addr array, while accessing an element i requires a
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* multiplication with sizeof(struct sys) to determine the address.
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*/
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EXTERN struct priv priv[NR_SYS_PROCS]; /* system properties table */
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EXTERN struct priv *ppriv_addr[NR_SYS_PROCS]; /* direct slot pointers */
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/* Make sure the system can boot. The following sanity check verifies that
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* the system privileges table is large enough for the number of processes
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* in the boot image.
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*/
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#if (NR_BOOT_PROCS > NR_SYS_PROCS)
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#error NR_SYS_PROCS must be larger than NR_BOOT_PROCS
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#endif
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#endif /* PRIV_H */
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