/**
* io_map
*
* Maps an IO region and returns its virtual address.
*/
vm_offset_t
io_map(vm_offset_t phys_addr, vm_size_t size, unsigned int flags)
{
vm_offset_t start;
if (kernel_map == VM_MAP_NULL) {
/*
* VM is not initialized. Grab memory.
*/
start = virt_begin;
virt_begin += round_page(size);
(void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
VM_PROT_READ|VM_PROT_WRITE,
flags);
}
else {
(void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
(void) pmap_map(start, phys_addr, phys_addr + round_page(size),
VM_PROT_READ|VM_PROT_WRITE,
flags);
}
return (start);
}
/*
* Allocate and map memory for devices that may need to be mapped before
* Mach VM is running.
*/
vm_offset_t
io_map(
vm_offset_t phys_addr,
vm_size_t size)
{
vm_offset_t start;
if (kernel_map == VM_MAP_NULL) {
/*
* VM is not initialized. Grab memory.
*/
start = kernel_virtual_start;
kernel_virtual_start += round_page(size);
printf("stealing kernel virtual addresses %08lx-%08lx\n", start, kernel_virtual_start);
}
else {
(void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
}
(void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
VM_PROT_READ|VM_PROT_WRITE);
return (start);
}