kernel/arch/i386/arch_do_vmctl.c

   1 /* The kernel call implemented in this file:
   2  *   m_type:    SYS_VMCTL
   3  *
   4  * The parameters for this kernel call are:
   5  *      SVMCTL_WHO      which process
   6  *      SVMCTL_PARAM    set this setting (VMCTL_*)
   7  *      SVMCTL_VALUE    to this value
   8  */
   9
  10 #include "kernel/system.h"
  11 #include <minix/type.h>
  12
  13 #include "proto.h"
  14
  15 /*===========================================================================*
  16  *                              arch_do_vmctl                                *
  17  *===========================================================================*/
  18 PUBLIC int arch_do_vmctl(m_ptr, p)
  19 register message *m_ptr;        /* pointer to request message */
  20 struct proc *p;
  21 {
  22   switch(m_ptr->SVMCTL_PARAM) {
  23         case VMCTL_I386_GETCR3:
  24                 /* Get process CR3. */
  25                 m_ptr->SVMCTL_VALUE = p->p_seg.p_cr3;
  26                 return OK;
  27         case VMCTL_SETADDRSPACE:
  28                 /* Set process CR3. */
  29                 if(m_ptr->SVMCTL_PTROOT) {
  30                         p->p_seg.p_cr3 = m_ptr->SVMCTL_PTROOT;
  31                         p->p_seg.p_cr3_v = (u32_t *) m_ptr->SVMCTL_PTROOT_V;
  32                         p->p_misc_flags |= MF_FULLVM;
  33                 } else {
  34                         p->p_seg.p_cr3 = 0;
  35                         p->p_seg.p_cr3_v = NULL;
  36                         p->p_misc_flags &= ~MF_FULLVM;
  37                 }
  38                 RTS_UNSET(p, RTS_VMINHIBIT);
  39                 return OK;
  40         case VMCTL_INCSP:
  41                 /* Increase process SP. */
  42                 p->p_reg.sp += m_ptr->SVMCTL_VALUE;
  43                 return OK;
  44         case VMCTL_I386_KERNELLIMIT:
  45         {
  46                 int r;
  47                 /* VM wants kernel to increase its segment. */
  48                 r = prot_set_kern_seg_limit(m_ptr->SVMCTL_VALUE);
  49                 return r;
  50         }
  51         case VMCTL_I386_FREEPDE:
  52         {
  53                 i386_freepde(m_ptr->SVMCTL_VALUE);
  54                 return OK;
  55         }
  56         case VMCTL_FLUSHTLB:
  57         {
  58                 reload_cr3();
  59                 return OK;
  60         }
  61   }
  62
  63
  64
  65   printf("arch_do_vmctl: strange param %d\n", m_ptr->SVMCTL_PARAM);
  66   return EINVAL;
  67 }