42ab148155
New configuration header file to include/ exclude functionality. Extracted privileged features from struct proc and create new struct priv. Renamed various system calls for readability.
123 lines
3.7 KiB
C
123 lines
3.7 KiB
C
/* The system call implemented in this file:
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* m_type: SYS_GETINFO
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*
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* The parameters for this system call are:
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* m1_i3: I_REQUEST (what info to get)
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* m1_i4: I_PROC_NR (process to store value at)
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* m1_p1: I_VAL_PTR (where to put it)
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* m1_i1: I_VAL_LEN (maximum length expected, optional)
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* m1_p2: I_KEY_PTR (environment variable key)
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* m1_i2: I_KEY_LEN (lenght of environment variable key)
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*
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* Author:
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* Jorrit N. Herder <jnherder@cs.vu.nl>
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*/
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#include "../system.h"
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#if USE_GETINFO
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/*===========================================================================*
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* do_getinfo *
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*===========================================================================*/
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PUBLIC int do_getinfo(m_ptr)
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register message *m_ptr; /* pointer to request message */
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{
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/* Request system information to be copied to caller's address space. */
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size_t length;
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phys_bytes src_phys;
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phys_bytes dst_phys;
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int proc_nr, nr;
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/* Set source address and length based on request type. */
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switch (m_ptr->I_REQUEST) {
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case GET_MACHINE: {
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length = sizeof(struct machine);
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src_phys = vir2phys(&machine);
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break;
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}
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case GET_KINFO: {
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length = sizeof(struct kinfo);
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src_phys = vir2phys(&kinfo);
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break;
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}
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case GET_IMAGE: {
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length = sizeof(struct system_image) * NR_BOOT_PROCS;
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src_phys = vir2phys(image);
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break;
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}
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case GET_IRQHOOKS: {
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length = sizeof(struct irq_hook) * NR_IRQ_HOOKS;
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src_phys = vir2phys(irq_hooks);
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break;
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}
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case GET_SCHEDINFO: {
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/* This is slightly complicated because we need two data structures
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* at once, otherwise the scheduling information may be incorrect.
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* Copy the queue heads and fall through to copy the process table.
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*/
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length = sizeof(struct proc *) * NR_SCHED_QUEUES;
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src_phys = vir2phys(rdy_head);
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dst_phys = numap_local(m_ptr->m_source, (vir_bytes) m_ptr->I_KEY_PTR,
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length);
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if (src_phys == 0 || dst_phys == 0) return(EFAULT);
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phys_copy(src_phys, dst_phys, length);
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/* fall through */
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}
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case GET_PROCTAB: {
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length = sizeof(struct proc) * (NR_PROCS + NR_TASKS);
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src_phys = vir2phys(proc);
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break;
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}
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case GET_PRIVTAB: {
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length = sizeof(struct priv) * (NR_SYS_PROCS);
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src_phys = vir2phys(priv);
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break;
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}
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case GET_PROC: {
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nr = (m_ptr->I_KEY_LEN == SELF) ? m_ptr->m_source : m_ptr->I_KEY_LEN;
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if (! isokprocn(nr)) return(EINVAL); /* validate request */
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length = sizeof(struct proc);
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src_phys = vir2phys(proc_addr(nr));
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break;
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}
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case GET_MONPARAMS: {
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src_phys = kinfo.params_base; /* already is a physical */
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length = kinfo.params_size;
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break;
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}
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case GET_RANDOMNESS: {
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struct randomness copy = krandom; /* copy to keep counters */
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krandom.r_next = krandom.r_size = 0; /* invalidate random data */
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length = sizeof(struct randomness);
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src_phys = vir2phys(©);
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break;
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}
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case GET_KMESSAGES: {
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length = sizeof(struct kmessages);
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src_phys = vir2phys(&kmess);
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break;
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}
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#if DEBUG_TIME_LOCKS
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case GET_LOCKTIMING: {
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length = sizeof(timingdata);
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src_phys = vir2phys(timingdata);
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break;
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}
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#endif
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default:
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return(EINVAL);
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}
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/* Try to make the actual copy for the requested data. */
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if (m_ptr->I_VAL_LEN > 0 && length > m_ptr->I_VAL_LEN) return (E2BIG);
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proc_nr = m_ptr->m_source; /* only caller can request copy */
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dst_phys = numap_local(proc_nr, (vir_bytes) m_ptr->I_VAL_PTR, length);
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if (src_phys == 0 || dst_phys == 0) return(EFAULT);
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phys_copy(src_phys, dst_phys, length);
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return(OK);
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}
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#endif /* USE_GETINFO */
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