static void* allocate_stack ( yarn_context_t* ctx )
{
void* ptr = page_allocate(STACK_SIZE, 0, PAGE_READ | PAGE_WRITE);
yarn_context_set_stack(ctx, ptr, STACK_SIZE);
yarn_check_stack(ptr);
DEBUG("allocated a stack at %p\n", ptr);
return ptr;
}
static int sys_mmap( int fd, void *vaddr )
{
struct thread *curr = thread_current();
struct list_elem *e;
struct opened_file_elem *opened_elem;
int check_valid = 0;
int count = 0;
// mmap_lock_acquire();
// printf("read bytes : %d\n",read_bytes);
// printf("aa\n");
if(vaddr==0)
{
// mmap_lock_release();
return -1;
}
// printf("%p\n",(int)vaddr&0xfff);
if( ((int)vaddr & 0xfff) !=0 || ( (int)vaddr>=PHYS_BASE -8*1024*1024 &&
(int)vaddr <=PHYS_BASE ) )
{
// printf("misalign\n");
// mmap_lock_release();
return -1;
}
struct page *check_page = page_lookup(curr,vaddr);
if( check_page!=NULL&& (check_page->writable == 0 || check_page->type==p_file) )
{
// mmap_lock_release();
return -1;
}
if(fd<2)
{
// mmap_lock_release();
return -1;
}
for( e = list_begin(&curr->openfile_list) ; e != list_end(&curr->openfile_list) ;
e = list_next(e) )
{
opened_elem=list_entry(e,struct opened_file_elem,elem_f);
if(opened_elem->fd==fd)
{
check_valid=1;
break;
}
}
if(check_valid==0)
{
// mmap_lock_release();
return -1;
}
for( e = list_begin(&curr->mapfile_list) ; e != list_end(&curr->mapfile_list) ;
e = list_next(e) )
{
// printf("check\n");
struct mapped_file_elem* mapped_elem=list_entry(e,struct mapped_file_elem,elem_m);
// printf("%d\n",mapped_elem->size);
if( mapped_elem->vaddr<=vaddr &&
vaddr<=mapped_elem->vaddr+mapped_elem->size)
{
// mmap_lock_release();
return -1;
}
}
struct mapped_file_elem *mapped_elem = (struct mapped_file_elem*)
malloc(sizeof(struct mapped_file_elem));
// char *name = (char*)malloc(strlen(opened_elem->name));
// strlcpy(name, opened_elem->name , strlen(opened_elem->name)+1);
int read_bytes = file_length(opened_elem->opened_file);
mapped_elem->mapped_file = opened_elem->opened_file;
mapped_elem->vaddr = vaddr;
mapped_elem->size = read_bytes;
mapped_elem->mapid = opened_elem->fd;
// mapped_elem->name = name;
list_push_back(&curr->mapfile_list,&mapped_elem->elem_m);
// printf("mapid: %d\n",opened_elem->mapid);
while(read_bytes >0)
{
// frame_lock_acquire();
int page_read_bytes = read_bytes<PGSIZE ? read_bytes:PGSIZE;
// printf("doing mmap\n");
// printf(" read bytes: %d\n",read_bytes);
page_allocate(vaddr, true, p_mmap, page_read_bytes,
PGSIZE-read_bytes, count*PGSIZE, mapped_elem->mapid);
// printf("mapid : %d\n",page_lookup(curr,vaddr)->mapid);
if(page_read_bytes < PGSIZE)
{
void *kpage=frame_elem_allocate(vaddr,true,PAL_USER);
file_read_at( mapped_elem->mapped_file, kpage, page_read_bytes, count*PGSIZE );
pagedir_set_page( thread_current()->pagedir,vaddr,kpage,true );
}
count+=1;
read_bytes-=PGSIZE;
vaddr+=PGSIZE;
// frame_lock_release();
}
// printf(" page allocate num:%d\n",count);
// printf("mmap finish\n");
// mmap_lock_release();
return mapped_elem->mapid;
}