minix/servers/vm/exit.c

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#define _SYSTEM 1
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/config.h>
#include <minix/const.h>
#include <minix/ds.h>
#include <minix/endpoint.h>
#include <minix/keymap.h>
#include <minix/minlib.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <errno.h>
#include <env.h>
#include "glo.h"
#include "proto.h"
#include "util.h"
#include "sanitycheck.h"
PUBLIC void free_proc(struct vmproc *vmp)
{
vmp->vm_flags &= ~VMF_HASPT;
pt_free(&vmp->vm_pt);
map_free_proc(vmp);
vmp->vm_regions = NULL;
#if VMSTATS
vmp->vm_bytecopies = 0;
#endif
}
PUBLIC void clear_proc(struct vmproc *vmp)
{
vmp->vm_regions = NULL;
vmp->vm_callback = NULL; /* No pending vfs callback. */
vmp->vm_flags = 0; /* Clear INUSE, so slot is free. */
vmp->vm_count = 0;
vmp->vm_heap = NULL;
#if VMSTATS
vmp->vm_bytecopies = 0;
#endif
}
/*===========================================================================*
* do_exit *
*===========================================================================*/
PUBLIC int do_exit(message *msg)
{
int proc;
struct vmproc *vmp;
SANITYCHECK(SCL_FUNCTIONS);
if(vm_isokendpt(msg->VME_ENDPOINT, &proc) != OK) {
printf("VM: bogus endpoint VM_EXIT %d\n", msg->VME_ENDPOINT);
return EINVAL;
}
vmp = &vmproc[proc];
if(!(vmp->vm_flags & VMF_EXITING)) {
printf("VM: unannounced VM_EXIT %d\n", msg->VME_ENDPOINT);
return EINVAL;
}
if(vmp->vm_flags & VMF_HAS_DMA) {
release_dma(vmp);
} else if(vmp->vm_flags & VMF_HASPT) {
/* Free pagetable and pages allocated by pt code. */
SANITYCHECK(SCL_DETAIL);
free_proc(vmp);
SANITYCHECK(SCL_DETAIL);
} else {
/* Free the data and stack segments. */
FREE_MEM(vmp->vm_arch.vm_seg[D].mem_phys,
vmp->vm_arch.vm_seg[S].mem_vir +
vmp->vm_arch.vm_seg[S].mem_len -
vmp->vm_arch.vm_seg[D].mem_vir);
if (find_share(vmp, vmp->vm_ino, vmp->vm_dev, vmp->vm_ctime) == NULL) {
/* No other process shares the text segment,
* so free it.
*/
FREE_MEM(vmp->vm_arch.vm_seg[T].mem_phys,
vmp->vm_arch.vm_seg[T].mem_len);
}
}
SANITYCHECK(SCL_DETAIL);
/* Reset process slot fields. */
clear_proc(vmp);
SANITYCHECK(SCL_FUNCTIONS);
return OK;
}
/*===========================================================================*
* do_willexit *
*===========================================================================*/
PUBLIC int do_willexit(message *msg)
{
int proc;
struct vmproc *vmp;
if(vm_isokendpt(msg->VMWE_ENDPOINT, &proc) != OK) {
printf("VM: bogus endpoint VM_EXITING %d\n",
msg->VMWE_ENDPOINT);
return EINVAL;
}
vmp = &vmproc[proc];
vmp->vm_flags |= VMF_EXITING;
return OK;
}