minix/kernel/system/misc.c

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#include "../kernel.h"
#include "../system.h"
#include <unistd.h>
#include <minix/config.h>
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/*===========================================================================*
* do_unused *
*===========================================================================*/
PUBLIC int do_unused(m)
message *m; /* pointer to request message */
{
kprintf("SYS task got illegal request from %d.", m->m_source);
return(EBADREQUEST); /* illegal message type */
}
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/* The system call implemented in this file:
* m_type: SYS_ABORT
*
* The parameters for this system call are:
* m1_i1: ABRT_HOW (how to abort, possibly fetch monitor params)
* m1_i2: ABRT_MON_PROC (proc nr to get monitor params from)
* m1_i3: ABRT_MON_LEN (length of monitor params)
* m1_p1: ABRT_MON_ADDR (virtual address of params)
*/
/*===========================================================================*
* do_abort *
*===========================================================================*/
PUBLIC int do_abort(m_ptr)
message *m_ptr; /* pointer to request message */
{
/* Handle sys_abort. MINIX is unable to continue. This can originate in the
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* PM (normal abort or panic) or FS (panic), or TTY (a CTRL-ALT-DEL or ESC
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* after debugging dumps).
*/
int how = m_ptr->ABRT_HOW;
if (how == RBT_MONITOR) {
/* The monitor is to run user specified instructions. */
int proc_nr = m_ptr->ABRT_MON_PROC;
int length = m_ptr->ABRT_MON_LEN + 1;
vir_bytes src_vir = (vir_bytes) m_ptr->ABRT_MON_ADDR;
phys_bytes src_phys = numap_local(proc_nr, src_vir, length);
/* Validate length and address of shutdown code before copying. */
if (length > kinfo.params_size || src_phys == 0)
kprintf("Warning, skipping shutdown code\n", NO_NUM);
else
phys_copy(src_phys, kinfo.params_base, (phys_bytes) length);
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}
prepare_shutdown(how);
return(OK); /* pro-forma (really EDISASTER) */
}
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/* The system call implemented in this file:
* m_type: SYS_GETINFO
*
* The parameters for this system call are:
* m1_i3: I_REQUEST (what info to get)
* m1_i4: I_PROC_NR (process to store value at)
* m1_p1: I_VAL_PTR (where to put it)
* m1_i1: I_VAL_LEN (maximum length expected, optional)
* m1_p2: I_KEY_PTR (environment variable key)
* m1_i2: I_KEY_LEN (lenght of environment variable key)
*
* Author:
* Jorrit N. Herder <jnherder@cs.vu.nl>
*/
/*===========================================================================*
* do_getinfo *
*===========================================================================*/
PUBLIC int do_getinfo(m_ptr)
register message *m_ptr; /* pointer to request message */
{
/* Request system information to be copied to caller's address space. */
size_t length;
phys_bytes src_phys;
phys_bytes dst_phys;
int proc_nr, nr;
/* Set source address and length based on request type. */
switch (m_ptr->I_REQUEST) {
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case GET_MACHINE: {
length = sizeof(struct machine);
src_phys = vir2phys(&machine);
break;
}
case GET_KINFO: {
length = sizeof(struct kinfo);
src_phys = vir2phys(&kinfo);
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break;
}
case GET_IMAGE: {
length = sizeof(struct system_image) * IMAGE_SIZE;
src_phys = vir2phys(image);
break;
}
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case GET_IRQHOOKS: {
length = sizeof(struct irq_hook) * NR_IRQ_HOOKS;
src_phys = vir2phys(irq_hooks);
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break;
}
case GET_SCHEDINFO: {
/* This is slightly complicated because we need two data structures
* at once, otherwise the scheduling information may be incorrect.
* Copy the queue heads and fall through to copy the process table.
*/
length = sizeof(struct proc *) * NR_SCHED_QUEUES;
src_phys = vir2phys(rdy_head);
dst_phys = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->I_KEY_PTR,
length);
if (src_phys == 0 || dst_phys == 0) return(EFAULT);
phys_copy(src_phys, dst_phys, length);
/* fall through */
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}
case GET_PROCTAB: {
length = sizeof(struct proc) * (NR_PROCS + NR_TASKS);
src_phys = vir2phys(proc);
break;
}
case GET_PROC: {
nr = (m_ptr->I_KEY_LEN == SELF) ? m_ptr->m_source : m_ptr->I_KEY_LEN;
if (! isokprocn(nr)) return(EINVAL); /* validate request */
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length = sizeof(struct proc);
src_phys = vir2phys(proc_addr(nr));
break;
}
case GET_MONPARAMS: {
src_phys = kinfo.params_base; /* already is a physical */
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length = kinfo.params_size;
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break;
}
case GET_RANDOMNESS: {
struct randomness copy = krandom; /* copy to keep counters */
krandom.r_next = krandom.r_size = 0; /* invalidate random data */
length = sizeof(struct randomness);
src_phys = vir2phys(&copy);
break;
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}
case GET_KMESSAGES: {
length = sizeof(struct kmessages);
src_phys = vir2phys(&kmess);
break;
}
#if ENABLE_LOCK_TIMING
case GET_LOCKTIMING: {
length = sizeof(timingdata);
src_phys = vir2phys(timingdata);
break;
}
#endif
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default:
return(EINVAL);
}
/* Try to make the actual copy for the requested data. */
if (m_ptr->I_VAL_LEN > 0 && length > m_ptr->I_VAL_LEN) return (E2BIG);
proc_nr = m_ptr->m_source; /* only caller can request copy */
dst_phys = numap_local(proc_nr, (vir_bytes) m_ptr->I_VAL_PTR, length);
if (src_phys == 0 || dst_phys == 0) return(EFAULT);
phys_copy(src_phys, dst_phys, length);
return(OK);
}