cregit-Linux how code gets into the kernel

Release 4.11 arch/arm64/include/asm/memory.h

Directory: arch/arm64/include/asm
/*
 * 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/bug.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)

/*
 * Size of the PCI I/O space. This must remain a power of two so that
 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
 */

#define PCI_IO_SIZE		SZ_16M

/*
 * Log2 of the upper bound of the size of a struct page. Used for sizing
 * the vmemmap region only, does not affect actual memory footprint.
 * We don't use sizeof(struct page) directly since taking its size here
 * requires its definition to be available at this point in the inclusion
 * chain, and it may not be a power of 2 in the first place.
 */

#define STRUCT_PAGE_MAX_SHIFT	6

/*
 * VMEMMAP_SIZE - allows the whole linear region to be covered by
 *                a struct page array
 */

#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))

/*
 * PAGE_OFFSET - the virtual address of the start of the linear map (top
 *               (VA_BITS - 1))
 * KIMAGE_VADDR - the virtual address of the start of the kernel image
 * VA_BITS - the maximum number of bits for virtual addresses.
 * VA_START - the first kernel virtual address.
 * TASK_SIZE - the maximum size of a user space task.
 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
 */

#define VA_BITS			(CONFIG_ARM64_VA_BITS)

#define VA_START		(UL(0xffffffffffffffff) << VA_BITS)

#define PAGE_OFFSET		(UL(0xffffffffffffffff) << (VA_BITS - 1))

#define KIMAGE_VADDR		(MODULES_END)

#define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)

#define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)

#define MODULES_VSIZE		(SZ_128M)

#define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)

#define PCI_IO_END		(VMEMMAP_START - SZ_2M)

#define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)

#define FIXADDR_TOP		(PCI_IO_START - SZ_2M)

#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)

#define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, 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))


#define KERNEL_START      _text

#define KERNEL_END        _end

/*
 * The size of the KASAN shadow region. This should be 1/8th of the
 * size of the entire kernel virtual address space.
 */
#ifdef CONFIG_KASAN

#define KASAN_SHADOW_SIZE	(UL(1) << (VA_BITS - 3))
#else

#define KASAN_SHADOW_SIZE	(0)
#endif

/*
 * 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

#define MT_NORMAL_WT		5

/*
 * Memory types for Stage-2 translation
 */

#define MT_S2_NORMAL		0xf

#define MT_S2_DEVICE_nGnRE	0x1

#ifdef CONFIG_ARM64_4K_PAGES

#define IOREMAP_MAX_ORDER	(PUD_SHIFT)
#else

#define IOREMAP_MAX_ORDER	(PMD_SHIFT)
#endif

#ifdef CONFIG_BLK_DEV_INITRD

#define __early_init_dt_declare_initrd(__start, __end)			\
	do {                                                            \
                initrd_start = (__start);                               \
                initrd_end = (__end);                                   \
        } while (0)
#endif

#ifndef __ASSEMBLY__

#include <linux/bitops.h>
#include <linux/mmdebug.h>

extern s64			memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */

#define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })

/* the virtual base of the kernel image (minus TEXT_OFFSET) */
extern u64			kimage_vaddr;

/* the offset between the kernel virtual and physical mappings */
extern u64			kimage_voffset;




static inline unsigned long kaslr_offset(void)
{
	return kimage_vaddr - KIMAGE_VADDR;
}


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/*
 * Allow all memory at the discovery stage. We will clip it later.
 */

#define MIN_MEMBLOCK_ADDR	0

#define MAX_MEMBLOCK_ADDR	U64_MAX

/*
 * 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)

/*
 * 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.
 */


/*
 * The linear kernel range starts in the middle of the virtual adddress
 * space. Testing the top bit for the start of the region is a
 * sufficient check.
 */

#define __is_lm_address(addr)	(!!((addr) & BIT(VA_BITS - 1)))


#define __lm_to_phys(addr)	(((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)

#define __kimg_to_phys(addr)	((addr) - kimage_voffset)


#define __virt_to_phys_nodebug(x) ({                                      \
        phys_addr_t __x = (phys_addr_t)(x);                             \
        __is_lm_address(__x) ? __lm_to_phys(__x) :                      \
                               __kimg_to_phys(__x);                     \
})


#define __pa_symbol_nodebug(x)	__kimg_to_phys((phys_addr_t)(x))

#ifdef CONFIG_DEBUG_VIRTUAL
extern phys_addr_t __virt_to_phys(unsigned long x);
extern phys_addr_t __phys_addr_symbol(unsigned long x);
#else

#define __virt_to_phys(x)	__virt_to_phys_nodebug(x)

#define __phys_addr_symbol(x)	__pa_symbol_nodebug(x)
#endif


#define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)

#define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))

/*
 * 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)))

/*
 * Note: Drivers should NOT use these.  They are the wrong
 * translation for translating DMA addresses.  Use the driver
 * DMA support - see dma-mapping.h.
 */

#define virt_to_phys virt_to_phys



static inline phys_addr_t virt_to_phys(const volatile void *x)
{
	return __virt_to_phys((unsigned long)(x));
}


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#define phys_to_virt phys_to_virt



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


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/*
 * Drivers should NOT use these either.
 */

#define __pa(x)			__virt_to_phys((unsigned long)(x))

#define __pa_symbol(x)		__phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))

#define __pa_nodebug(x)		__virt_to_phys_nodebug((unsigned long)(x))

#define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys((unsigned long)(x)))

#define sym_to_pfn(x)	    __phys_to_pfn(__pa_symbol(x))

/*
 *  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		((unsigned long)PHYS_PFN_OFFSET)

#ifndef CONFIG_SPARSEMEM_VMEMMAP

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)

#define _virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
#else

#define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))

#define __page_to_voff(kaddr)	(((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))


#define page_to_virt(page)	((void *)((__page_to_voff(page)) | PAGE_OFFSET))

#define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))


#define _virt_addr_valid(kaddr)	pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
                                           + PHYS_OFFSET) >> PAGE_SHIFT)
#endif
#endif


#define _virt_addr_is_linear(kaddr)	(((u64)(kaddr)) >= PAGE_OFFSET)

#define virt_addr_valid(kaddr)		(_virt_addr_is_linear(kaddr) && \
                                         _virt_addr_valid(kaddr))

#include <asm-generic/memory_model.h>

#endif

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Directory: arch/arm64/include/asm



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