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/*
* Mach Operating System
* Copyright (c) 1991,1990 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <kern/printf.h>
#include <mach/vm_param.h>
#include <vm/pmap.h>
#include <vm/vm_kern.h>
#include <vm/vm_map.h>
extern vm_offset_t kernel_virtual_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);
}
/*
* Allocate and map memory for devices that may need to be mapped before
* Mach VM is running.
*
* This maps the all pages containing [PHYS_ADDR:PHYS_ADDR + SIZE].
* For contiguous requests to those pages will reuse the previously
* established mapping.
*
* Warning: this leaks memory maps for now, do not use it yet for something
* else than Mach shutdown.
*/
vm_offset_t
io_map_cached(
vm_offset_t phys_addr,
vm_size_t size)
{
static vm_offset_t base;
static vm_size_t length;
static vm_offset_t map;
if (! map
|| (phys_addr < base)
|| (base + length < phys_addr + size))
{
base = trunc_page(phys_addr);
length = round_page(phys_addr - base + size);
map = io_map(base, length);
}
return map + (phys_addr - base);
}
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