memory.h

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/*
 * Based on arch/arm/include/asm/memory.h
 *
 * Copyright (C) 2000-2002 Russell King
 * Copyright (C) 2012 ARM Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Note: this file should not be included by non-asm/.h files
 */
#ifndef __ASM_MEMORY_H
#define __ASM_MEMORY_H

#include <linux/compiler.h>
#include <linux/const.h>
#include <linux/types.h>
#include <asm/sizes.h>

/*
 * Allow for constants defined here to be used from assembly code
 * by prepending the UL suffix only with actual C code compilation.
 */
#define UL(x) _AC(x, UL)

/*
 * PAGE_OFFSET - the virtual address of the start of the kernel image.
 * VA_BITS - the maximum number of bits for virtual addresses.
 * TASK_SIZE - the maximum size of a user space task.
 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
 * The module space lives between the addresses given by TASK_SIZE
 * and PAGE_OFFSET - it must be within 128MB of the kernel text.
 */
#define PAGE_OFFSET     UL(0xffffffc000000000)
#define MODULES_END     (PAGE_OFFSET)
#define MODULES_VADDR       (MODULES_END - SZ_64M)
#define VA_BITS         (39)
#define TASK_SIZE_64        (UL(1) << VA_BITS)

#ifdef CONFIG_COMPAT
#define TASK_SIZE_32        UL(0x100000000)
#define TASK_SIZE       (test_thread_flag(TIF_32BIT) ? \
                TASK_SIZE_32 : TASK_SIZE_64)
#else
#define TASK_SIZE       TASK_SIZE_64
#endif /* CONFIG_COMPAT */

#define TASK_UNMAPPED_BASE  (PAGE_ALIGN(TASK_SIZE / 4))

#if TASK_SIZE_64 > MODULES_VADDR
#error Top of 64-bit user space clashes with start of module space
#endif

/*
 * Physical vs virtual RAM address space conversion.  These are
 * private definitions which should NOT be used outside memory.h
 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 */
#define __virt_to_phys(x)   (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
#define __phys_to_virt(x)   ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))

/*
 * Convert a physical address to a Page Frame Number and back
 */
#define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
#define __pfn_to_phys(pfn)  ((phys_addr_t)(pfn) << PAGE_SHIFT)

/*
 * Convert a page to/from a physical address
 */
#define page_to_phys(page)  (__pfn_to_phys(page_to_pfn(page)))
#define phys_to_page(phys)  (pfn_to_page(__phys_to_pfn(phys)))

/*
 * Memory types available.
 */
#define MT_DEVICE_nGnRnE    0
#define MT_DEVICE_nGnRE     1
#define MT_DEVICE_GRE       2
#define MT_NORMAL_NC        3
#define MT_NORMAL       4

#ifndef __ASSEMBLY__

extern phys_addr_t      memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
#define PHYS_OFFSET     ({ memstart_addr; })

/*
 * PFNs are used to describe any physical page; this means
 * PFN 0 == physical address 0.
 *
 * This is the PFN of the first RAM page in the kernel
 * direct-mapped view.  We assume this is the first page
 * of RAM in the mem_map as well.
 */
#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)

/*
 * Note: Drivers should NOT use these.  They are the wrong
 * translation for translating DMA addresses.  Use the driver
 * DMA support - see dma-mapping.h.
 */
static inline phys_addr_t virt_to_phys(const volatile void *x)
{
    return __virt_to_phys((unsigned long)(x));
}

static inline void *phys_to_virt(phys_addr_t x)
{
    return (void *)(__phys_to_virt(x));
}

/*
 * Drivers should NOT use these either.
 */
#define __pa(x)         __virt_to_phys((unsigned long)(x))
#define __va(x)         ((void *)__phys_to_virt((phys_addr_t)(x)))
#define pfn_to_kaddr(pfn)   __va((pfn) << PAGE_SHIFT)

/*
 *  virt_to_page(k) convert a _valid_ virtual address to struct page *
 *  virt_addr_valid(k)  indicates whether a virtual address is valid
 */
#define ARCH_PFN_OFFSET     PHYS_PFN_OFFSET

#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)  (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
                 ((void *)(kaddr) < (void *)high_memory))

#endif

#include <asm-generic/memory_model.h>

#endif