minix3/servers/vm/exit.c

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2020-02-21 00:59:27 +05:30
#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/minlib.h>
#include <minix/type.h>
#include <minix/ipc.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include <minix/bitmap.h>
#include <errno.h>
#include <assert.h>
#include <env.h>
#include "glo.h"
#include "proto.h"
#include "util.h"
#include "sanitycheck.h"
static void reset_vm_rusage(struct vmproc *vmp)
{
vmp->vm_total = 0;
vmp->vm_total_max = 0;
vmp->vm_minor_page_fault = 0;
vmp->vm_major_page_fault = 0;
}
void free_proc(struct vmproc *vmp)
{
map_free_proc(vmp);
pt_free(&vmp->vm_pt);
region_init(&vmp->vm_regions_avl);
#if VMSTATS
vmp->vm_bytecopies = 0;
#endif
vmp->vm_region_top = 0;
reset_vm_rusage(vmp);
}
void clear_proc(struct vmproc *vmp)
{
region_init(&vmp->vm_regions_avl);
acl_clear(vmp);
vmp->vm_flags = 0; /* Clear INUSE, so slot is free. */
#if VMSTATS
vmp->vm_bytecopies = 0;
#endif
vmp->vm_region_top = 0;
reset_vm_rusage(vmp);
}
/*===========================================================================*
* do_exit *
*===========================================================================*/
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;
}
{
/* Free pagetable and pages allocated by pt code. */
SANITYCHECK(SCL_DETAIL);
free_proc(vmp);
SANITYCHECK(SCL_DETAIL);
}
SANITYCHECK(SCL_DETAIL);
/* Reset process slot fields. */
clear_proc(vmp);
SANITYCHECK(SCL_FUNCTIONS);
return OK;
}
/*===========================================================================*
* do_willexit *
*===========================================================================*/
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;
}
int do_procctl(message *msg, int transid)
{
endpoint_t proc;
struct vmproc *vmp;
if(vm_isokendpt(msg->VMPCTL_WHO, &proc) != OK) {
printf("VM: bogus endpoint VM_PROCCTL %ld\n",
msg->VMPCTL_WHO);
return EINVAL;
}
vmp = &vmproc[proc];
switch(msg->VMPCTL_PARAM) {
case VMPPARAM_CLEAR:
if(msg->m_source != RS_PROC_NR
&& msg->m_source != VFS_PROC_NR)
return EPERM;
free_proc(vmp);
if(pt_new(&vmp->vm_pt) != OK)
panic("VMPPARAM_CLEAR: pt_new failed");
pt_bind(&vmp->vm_pt, vmp);
return OK;
case VMPPARAM_HANDLEMEM:
{
if(msg->m_source != VFS_PROC_NR)
return EPERM;
handle_memory_start(vmp, msg->VMPCTL_M1,
msg->VMPCTL_LEN, msg->VMPCTL_FLAGS,
VFS_PROC_NR, VFS_PROC_NR, transid, 1);
return SUSPEND;
}
default:
return EINVAL;
}
return OK;
}