minix/servers/vm/mmap.c
Ben Gras 68d0c4defe - code shared with exec() letting boot-time processes have
their own fully fledged virtual address space and freeing
   their pre-allocated heap+stack area (necessary to let memory
   driver map in arbitrary areas of memory for /dev/mem without
   sys_vm_map)
 - small optimization preallocating memory on exec
 - finished VR_DIRECT physical mapping code
2008-12-08 16:43:20 +00:00

154 lines
3.3 KiB
C

#define _SYSTEM 1
#define VERBOSE 0
#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 <minix/safecopies.h>
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
#include <env.h>
#include <stdio.h>
#include <fcntl.h>
#include <memory.h>
#include "glo.h"
#include "proto.h"
#include "util.h"
#include "region.h"
/*===========================================================================*
* do_mmap *
*===========================================================================*/
PUBLIC int do_mmap(message *m)
{
int r, n;
struct vmproc *vmp;
int mfflags = 0;
struct vir_region *vr = NULL;
if((r=vm_isokendpt(m->m_source, &n)) != OK) {
vm_panic("do_mmap: message from strange source", m->m_source);
}
vmp = &vmproc[n];
if(m->VMM_FLAGS & MAP_LOWER16M)
printf("VM: warning for %d: MAP_LOWER16M not implemented\n",
m->m_source);
if(!(vmp->vm_flags & VMF_HASPT))
return ENXIO;
if(m->VMM_FD == -1 || (m->VMM_FLAGS & MAP_ANON)) {
int s;
vir_bytes v;
size_t len = (vir_bytes) m->VMM_LEN;
if(m->VMM_FD != -1) {
return EINVAL;
}
if(m->VMM_FLAGS & MAP_CONTIG) mfflags |= MF_CONTIG;
if(m->VMM_FLAGS & MAP_PREALLOC) mfflags |= MF_PREALLOC;
if(len % VM_PAGE_SIZE)
len += VM_PAGE_SIZE - (len % VM_PAGE_SIZE);
if(!(vr = map_page_region(vmp,
arch_vir2map(vmp, vmp->vm_stacktop), VM_DATATOP, len, MAP_NONE,
VR_ANON | VR_WRITABLE, mfflags))) {
return ENOMEM;
}
} else {
return ENOSYS;
}
/* Return mapping, as seen from process. */
vm_assert(vr);
m->VMM_RETADDR = arch_map2vir(vmp, vr->vaddr);
return OK;
}
/*===========================================================================*
* do_map_phys *
*===========================================================================*/
PUBLIC int do_map_phys(message *m)
{
int r, n;
struct vmproc *vmp;
endpoint_t target;
struct vir_region *vr;
target = m->VMMP_EP;
if(target == SELF)
target = m->m_source;
if((r=vm_isokendpt(target, &n)) != OK)
return EINVAL;
vmp = &vmproc[n];
if(!(vmp->vm_flags & VMF_HASPT))
return ENXIO;
if(!(vr = map_page_region(vmp, arch_vir2map(vmp, vmp->vm_stacktop),
VM_DATATOP, (vir_bytes) m->VMMP_LEN, (vir_bytes)m->VMMP_PHADDR,
VR_DIRECT | VR_NOPF | VR_WRITABLE, 0))) {
return ENOMEM;
}
m->VMMP_VADDR_REPLY = (void *) arch_map2vir(vmp, vr->vaddr);
return OK;
}
/*===========================================================================*
* do_unmap_phys *
*===========================================================================*/
PUBLIC int do_unmap_phys(message *m)
{
int r, n;
struct vmproc *vmp;
endpoint_t target;
struct vir_region *region;
target = m->VMUP_EP;
if(target == SELF)
target = m->m_source;
if((r=vm_isokendpt(target, &n)) != OK)
return EINVAL;
vmp = &vmproc[n];
if(!(region = map_lookup(vmp,
arch_vir2map(vmp, (vir_bytes) m->VMUM_ADDR)))) {
return EINVAL;
}
if(!(region->flags & VR_DIRECT)) {
return EINVAL;
}
if(map_unmap_region(vmp, region) != OK) {
return EINVAL;
}
return OK;
}