vm_param.h

/*
 * Copyright (c) 2007 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * FILE_ID: vm_param.h
 */

/*
 *	ARM machine dependent virtual memory parameters.
 */

#ifndef	_MACH_ARM_VM_PARAM_H_
#define _MACH_ARM_VM_PARAM_H_

#if defined(KERNEL_PRIVATE) && __ARM_16K_PG__
#include <arm64/proc_reg.h>
#endif

#if !defined (KERNEL) && !defined (__ASSEMBLER__)
#include <mach/vm_page_size.h>
#endif

#define BYTE_SIZE	8	/* byte size in bits */

#if defined (KERNEL)

#ifndef __ASSEMBLER__

#ifdef	__arm__
#define	PAGE_SHIFT_CONST	12
#elif defined(__arm64__)
extern unsigned		PAGE_SHIFT_CONST;
#else
#error Unsupported arch
#endif

#if defined(KERNEL_PRIVATE) && __ARM_16K_PG__
#define PAGE_SHIFT		ARM_PGSHIFT
#else
#define PAGE_SHIFT		PAGE_SHIFT_CONST
#endif
#define PAGE_SIZE		(1 << PAGE_SHIFT)
#define PAGE_MASK		(PAGE_SIZE-1)

#define VM_PAGE_SIZE		PAGE_SIZE

#define	machine_ptob(x)		((x) << PAGE_SHIFT)

/*
 * Defined for the purpose of testing the pmap advertised page
 * size; this does not necessarily match the hardware page size.
 */
#define	TEST_PAGE_SIZE_16K	((PAGE_SHIFT_CONST == 14))
#define	TEST_PAGE_SIZE_4K	((PAGE_SHIFT_CONST == 12))

#endif	/* !__ASSEMBLER__ */

#else

#define PAGE_SHIFT			vm_page_shift
#define PAGE_SIZE			vm_page_size
#define PAGE_MASK			vm_page_mask

#define VM_PAGE_SIZE		vm_page_size

#define	machine_ptob(x)		((x) << PAGE_SHIFT)

#endif

#define PAGE_MAX_SHIFT		14
#define PAGE_MAX_SIZE		(1 << PAGE_MAX_SHIFT)
#define PAGE_MAX_MASK		(PAGE_MAX_SIZE-1)

#define PAGE_MIN_SHIFT		12
#define PAGE_MIN_SIZE		(1 << PAGE_MIN_SHIFT)
#define PAGE_MIN_MASK		(PAGE_MIN_SIZE-1)

#ifndef __ASSEMBLER__

#ifdef  MACH_KERNEL_PRIVATE

#define VM32_SUPPORT		1
#define VM32_MIN_ADDRESS	((vm32_offset_t) 0)
#define VM32_MAX_ADDRESS	((vm32_offset_t) (VM_MAX_PAGE_ADDRESS & 0xFFFFFFFF))
#define VM_MAX_PAGE_ADDRESS	VM_MAX_ADDRESS	/* ARM64_TODO: ?? */

/*
 * kalloc() parameters:
 *
 * Historically kalloc's underlying zones were power-of-2 sizes, with a
 * KALLOC_MINSIZE of 16 bytes.  Thus the allocator ensured that
 * (sizeof == alignof) >= 16 for all kalloc allocations.
 *
 * Today kalloc may use zones with intermediate (small) sizes, constrained by
 * KALLOC_MINSIZE and a minimum alignment, expressed by KALLOC_LOG2_MINALIGN.
 *
 * Note that most dynamically allocated data structures contain more than
 * one int/long/pointer member, so KALLOC_MINSIZE should probably start at 8.
 */

#if defined (__arm__)

#define	KALLOC_MINSIZE		8	/* minimum allocation size */
#define	KALLOC_LOG2_MINALIGN	3	/* log2 minimum alignment */

#elif defined(__arm64__)

#define	KALLOC_MINSIZE		16	/* minimum allocation size */
#define	KALLOC_LOG2_MINALIGN	4	/* log2 minimum alignment */

#else
#error Unsupported arch
#endif

#endif

#if defined (__arm__)

#define VM_MIN_ADDRESS		((vm_address_t) 0x00000000)
#define VM_MAX_ADDRESS		((vm_address_t) 0x80000000)

/* system-wide values */
#define MACH_VM_MIN_ADDRESS	((mach_vm_offset_t) 0)
#define MACH_VM_MAX_ADDRESS	((mach_vm_offset_t) VM_MAX_ADDRESS)

#elif defined (__arm64__)

#define VM_MIN_ADDRESS		((vm_address_t) 0x0000000000000000ULL)
#define VM_MAX_ADDRESS		((vm_address_t) 0x0000000080000000ULL)

/* system-wide values */
#define MACH_VM_MIN_ADDRESS	((mach_vm_offset_t) 0x0ULL)
#define MACH_VM_MAX_ADDRESS	((mach_vm_offset_t) 0x0000001000000000ULL)

#else
#error architecture not supported
#endif

#define VM_MAP_MIN_ADDRESS      VM_MIN_ADDRESS
#define VM_MAP_MAX_ADDRESS      VM_MAX_ADDRESS

#ifdef	KERNEL

#if defined (__arm__)
#define VM_MIN_KERNEL_ADDRESS	((vm_address_t) 0x80000000)
#define VM_MAX_KERNEL_ADDRESS	((vm_address_t) 0xFFFEFFFF)
#define VM_HIGH_KERNEL_WINDOW	((vm_address_t) 0xFFFE0000)
#elif defined (__arm64__)
/*
 * The minimum and maximum kernel address; some configurations may
 * constrain the address space further.
 */
#define VM_MIN_KERNEL_ADDRESS	((vm_address_t) 0xffffffe000000000ULL)
#define VM_MAX_KERNEL_ADDRESS	((vm_address_t) 0xfffffff3ffffffffULL)
#else
#error architecture not supported
#endif

#define VM_MIN_KERNEL_AND_KEXT_ADDRESS	\
				VM_MIN_KERNEL_ADDRESS

#define VM_KERNEL_ADDRESS(va)	((((vm_address_t)(va))>=VM_MIN_KERNEL_ADDRESS) && \
				(((vm_address_t)(va))<=VM_MAX_KERNEL_ADDRESS))

#ifdef  MACH_KERNEL_PRIVATE
/*
 *	Physical memory is mapped linearly at an offset virtual memory.
 */
extern unsigned long		gVirtBase, gPhysBase, gPhysSize;

#define isphysmem(a)		(((vm_address_t)(a) - gPhysBase) < gPhysSize)
#define phystokv(a)		((vm_address_t)(a) - gPhysBase + gVirtBase)

#if KASAN
/* Increase the stack sizes to account for the redzones that get added to every
 * stack object. */
# define KERNEL_STACK_SIZE	(4*4*4096)
# define INTSTACK_SIZE		(4*4*4096)
#else
# define KERNEL_STACK_SIZE	(4*4096)
# define INTSTACK_SIZE		(4*4096)
#endif

#if defined (__arm__)
#define HIGH_EXC_VECTORS	((vm_address_t) 0xFFFF0000)
#endif

#endif	/* MACH_KERNEL_PRIVATE */
#endif	/* KERNEL */

#endif	/* !__ASSEMBLER__ */

#define SWI_SYSCALL	0x80

#endif	/* _MACH_ARM_VM_PARAM_H_ */