void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
int pfn = PFN_UP(__pa(reserve_end));
int delta = (len - reserve) >> PAGE_SHIFT;
int err, offset, bootmap_size;
physmem_fd = create_mem_file(len + highmem);
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
len - offset, 1, 1, 1);
if (err < 0) {
printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
"failed - errno = %d\n", len - offset,
(void *) uml_reserved, err);
exit(1);
}
/*
* Special kludge - This page will be mapped in to userspace processes
* from physmem_fd, so it needs to be written out there.
*/
os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
bootmap_size = init_bootmem(pfn, pfn + delta);
free_bootmem(__pa(reserve_end) + bootmap_size,
len - bootmap_size - reserve);
}
static void do_ops(int unused, struct host_vm_op *ops, int last)
{
struct host_vm_op *op;
int i;
for(i = 0; i <= last; i++){
op = &ops[i];
switch(op->type){
case MMAP:
os_map_memory((void *) op->u.mmap.addr, op->u.mmap.fd,
op->u.mmap.offset, op->u.mmap.len,
op->u.mmap.r, op->u.mmap.w,
op->u.mmap.x);
break;
case MUNMAP:
os_unmap_memory((void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
protect_memory(op->u.mprotect.addr, op->u.munmap.len,
op->u.mprotect.r, op->u.mprotect.w,
op->u.mprotect.x, 1);
break;
default:
printk("Unknown op type %d in do_ops\n", op->type);
break;
}
}
}
void map_memory(unsigned long virt, unsigned long phys, unsigned long len,
int r, int w, int x)
{
__u64 offset;
int fd, err;
fd = phys_mapping(phys, &offset);
err = os_map_memory((void *) virt, fd, offset, len, r, w, x);
if (err) {
if (err == -ENOMEM)
printk(KERN_ERR "try increasing the host's "
"/proc/sys/vm/max_map_count to <physical "
"memory size>/4096\n");
panic("map_memory(0x%lx, %d, 0x%llx, %ld, %d, %d, %d) failed, "
"err = %d\n", virt, fd, offset, len, r, w, x, err);
}
}
int setup_iomem(void)
{
struct iomem_region *region = iomem_regions;
unsigned long iomem_start = high_physmem + PAGE_SIZE;
int err;
while (region != NULL) {
err = os_map_memory((void *) iomem_start, region->fd, 0,
region->size, 1, 1, 0);
if (err)
printk(KERN_ERR "Mapping iomem region for driver '%s' "
"failed, errno = %d\n", region->driver, -err);
else {
region->virt = iomem_start;
region->phys = __pa(region->virt);
}
iomem_start += region->size + PAGE_SIZE;
region = region->next;
}
return 0;
}
