xnu-2422.115.4.tar.gz

[apple/xnu.git] / osfmk / vm / vm_init.c

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 * Please obtain a copy of the License at
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/*
 * @OSF_COPYRIGHT@
 */
/* 
 * Mach Operating System
 * Copyright (c) 1991,1990,1989,1988,1987 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.
 */
/*
 */
/*
 *	File:	vm/vm_init.c
 *	Author:	Avadis Tevanian, Jr., Michael Wayne Young
 *	Date:	1985
 *
 *	Initialize the Virtual Memory subsystem.
 */

#include <mach/machine/vm_types.h>
#include <mach/vm_map.h>
#include <kern/zalloc.h>
#include <kern/kalloc.h>
#include <kern/kext_alloc.h>
#include <vm/vm_object.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
#include <vm/memory_object.h>
#include <vm/vm_fault.h>
#include <vm/vm_init.h>

#include <pexpert/pexpert.h>

#include <vm/vm_protos.h>

#define ZONE_MAP_MIN CONFIG_ZONE_MAP_MIN

/* Maximum zone size is 1.5G */
#define ZONE_MAP_MAX (1024 * 1024 * 1536) 

const vm_offset_t vm_min_kernel_address = VM_MIN_KERNEL_AND_KEXT_ADDRESS;
const vm_offset_t vm_max_kernel_address = VM_MAX_KERNEL_ADDRESS;

boolean_t vm_kernel_ready = FALSE;
boolean_t kmem_ready = FALSE;
boolean_t kmem_alloc_ready = FALSE;
boolean_t zlog_ready = FALSE;

vm_offset_t kmapoff_kaddr;
unsigned int kmapoff_pgcnt;

/*
 *	vm_mem_bootstrap initializes the virtual memory system.
 *	This is done only by the first cpu up.
 */

void
vm_mem_bootstrap(void)
{
	vm_offset_t	start, end;
	vm_size_t zsizearg;
	mach_vm_size_t zsize;

	/*
	 *	Initializes resident memory structures.
	 *	From here on, all physical memory is accounted for,
	 *	and we use only virtual addresses.
	 */
#define vm_mem_bootstrap_kprintf(x) /* kprintf(x) */

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling vm_page_bootstrap\n"));
	vm_page_bootstrap(&start, &end);

	/*
	 *	Initialize other VM packages
	 */

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling zone_bootstrap\n"));
	zone_bootstrap();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling vm_object_bootstrap\n"));
	vm_object_bootstrap();

	vm_kernel_ready = TRUE;

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling vm_map_init\n"));
	vm_map_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling kmem_init\n"));
	kmem_init(start, end);
	kmem_ready = TRUE;
	/*
	 * Eat a random amount of kernel_map to fuzz subsequent heap, zone and
	 * stack addresses. (With a 4K page and 9 bits of randomness, this
	 * eats at most 2M of VA from the map.)
	 */
	if (!PE_parse_boot_argn("kmapoff", &kmapoff_pgcnt,
	    sizeof (kmapoff_pgcnt)))
		kmapoff_pgcnt = early_random() & 0x1ff;	/* 9 bits */

	if (kmapoff_pgcnt > 0 &&
	    vm_allocate(kernel_map, &kmapoff_kaddr,
	    kmapoff_pgcnt * PAGE_SIZE_64, VM_FLAGS_ANYWHERE) != KERN_SUCCESS)
		panic("cannot vm_allocate %u kernel_map pages", kmapoff_pgcnt);

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling pmap_init\n"));
	pmap_init();
	
	kmem_alloc_ready = TRUE;

	if (PE_parse_boot_argn("zsize", &zsizearg, sizeof (zsizearg)))
		zsize = zsizearg * 1024ULL * 1024ULL;
	else {
		zsize = sane_size >> 2;				/* Get target zone size as 1/4 of physical memory */
	}

	if (zsize < ZONE_MAP_MIN)
		zsize = ZONE_MAP_MIN;	/* Clamp to min */
#if defined(__LP64__)
	zsize += zsize >> 1;
#endif  /* __LP64__ */
	if (zsize > sane_size >> 1)
		zsize = sane_size >> 1;	/* Clamp to half of RAM max */
#if !__LP64__
	if (zsize > ZONE_MAP_MAX)
		zsize = ZONE_MAP_MAX;	/* Clamp to 1.5GB max for K32 */
#endif /* !__LP64__ */

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling kext_alloc_init\n"));
	kext_alloc_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling zone_init\n"));
	assert((vm_size_t) zsize == zsize);
	zone_init((vm_size_t) zsize);	/* Allocate address space for zones */

	/* The vm_page_zone must be created prior to kalloc_init; that
	 * routine can trigger zalloc()s (for e.g. mutex statistic structure
	 * initialization). The vm_page_zone must exist to saisfy fictitious
	 * page allocations (which are used for guard pages by the guard
	 * mode zone allocator).
	 */
	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling vm_page_module_init\n"));
	vm_page_module_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling kalloc_init\n"));
	kalloc_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling vm_fault_init\n"));
	vm_fault_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling memory_manager_default_init\n"));
	memory_manager_default_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling memory_object_control_bootstrap\n"));
	memory_object_control_bootstrap();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: calling device_pager_bootstrap\n"));
	device_pager_bootstrap();

	vm_paging_map_init();

	vm_mem_bootstrap_kprintf(("vm_mem_bootstrap: done\n"));
}

void
vm_mem_init(void)
{
	vm_object_init();
}