nds32: MMU definitions

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __ASM_NDS32_FIXMAP_H

#define __ASM_NDS32_FIXMAP_H

#ifdef CONFIG_HIGHMEM

#include <linux/threads.h>

#include <asm/kmap_types.h>

#endif

enum fixed_addresses {

	FIX_HOLE,

	FIX_KMAP_RESERVED,

	FIX_KMAP_BEGIN,

#ifdef CONFIG_HIGHMEM

	FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS),

#endif

	FIX_EARLYCON_MEM_BASE,

	__end_of_fixed_addresses

};

#define FIXADDR_TOP             ((unsigned long) (-(16 * PAGE_SIZE)))

#define FIXADDR_SIZE		((__end_of_fixed_addresses) << PAGE_SHIFT)

#define FIXADDR_START		(FIXADDR_TOP - FIXADDR_SIZE)

#define FIXMAP_PAGE_IO		__pgprot(PAGE_DEVICE)

void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);

#include <asm-generic/fixmap.h>

#endif /* __ASM_NDS32_FIXMAP_H */

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef _ASM_HIGHMEM_H

#define _ASM_HIGHMEM_H

#include <asm/proc-fns.h>

#include <asm/kmap_types.h>

#include <asm/fixmap.h>

#include <asm/pgtable.h>

/*

 * Right now we initialize only a single pte table. It can be extended

 * easily, subsequent pte tables have to be allocated in one physical

 * chunk of RAM.

 */

/*

 * Ordering is (from lower to higher memory addresses):

 *

 * high_memory

 *			Persistent kmap area

 * PKMAP_BASE

 *			fixed_addresses

 * FIXADDR_START

 * FIXADDR_TOP

 *			Vmalloc area

 * VMALLOC_START

 * VMALLOC_END

 */

#define PKMAP_BASE		((FIXADDR_START - PGDIR_SIZE) & (PGDIR_MASK))

#define LAST_PKMAP		PTRS_PER_PTE

#define LAST_PKMAP_MASK		(LAST_PKMAP - 1)

#define PKMAP_NR(virt)		(((virt) - (PKMAP_BASE)) >> PAGE_SHIFT)

#define PKMAP_ADDR(nr)		(PKMAP_BASE + ((nr) << PAGE_SHIFT))

#define kmap_prot		PAGE_KERNEL

static inline void flush_cache_kmaps(void)

{

	cpu_dcache_wbinval_all();

}

/* declarations for highmem.c */

extern unsigned long highstart_pfn, highend_pfn;

extern pte_t *pkmap_page_table;

extern void *kmap_high(struct page *page);

extern void kunmap_high(struct page *page);

extern void kmap_init(void);

/*

 * The following functions are already defined by <linux/highmem.h>

 * when CONFIG_HIGHMEM is not set.

 */

#ifdef CONFIG_HIGHMEM

extern void *kmap(struct page *page);

extern void kunmap(struct page *page);

extern void *kmap_atomic(struct page *page);

extern void __kunmap_atomic(void *kvaddr);

extern void *kmap_atomic_pfn(unsigned long pfn);

extern struct page *kmap_atomic_to_page(void *ptr);

#endif

#endif

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __ASM_NDS32_MEMORY_H

#define __ASM_NDS32_MEMORY_H

#include <linux/compiler.h>

#include <linux/sizes.h>

#ifndef __ASSEMBLY__

#include <asm/page.h>

#endif

#ifndef PHYS_OFFSET

#define PHYS_OFFSET     (0x0)

#endif

#ifndef __virt_to_bus

#define __virt_to_bus	__virt_to_phys

#endif

#ifndef __bus_to_virt

#define __bus_to_virt	__phys_to_virt

#endif

/*

 * TASK_SIZE - the maximum size of a user space task.

 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area

 */

#define TASK_SIZE		((CONFIG_PAGE_OFFSET) - (SZ_32M))

#define TASK_UNMAPPED_BASE	ALIGN(TASK_SIZE / 3, SZ_32M)

#define PAGE_OFFSET		(CONFIG_PAGE_OFFSET)

/*

 * 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.

 */

#ifndef __virt_to_phys

#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)

#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)

#endif

/*

 * The module space lives between the addresses given by TASK_SIZE

 * and PAGE_OFFSET - it must be within 32MB of the kernel text.

 */

#define MODULES_END	(PAGE_OFFSET)

#define MODULES_VADDR	(MODULES_END - SZ_32M)

#if TASK_SIZE > MODULES_VADDR

#error Top of user space clashes with start of module space

#endif

#ifndef __ASSEMBLY__

/*

 * 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)

/*

 * Drivers should NOT use these either.

 */

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

#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))

/*

 * Conversion between a struct page and a physical address.

 *

 * Note: when converting an unknown physical address to a

 * struct page, the resulting pointer must be validated

 * using VALID_PAGE().  It must return an invalid struct page

 * for any physical address not corresponding to a system

 * RAM address.

 *

 *  pfn_valid(pfn)	indicates whether a PFN number is valid

 *

 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *

 *  virt_addr_valid(k)	indicates whether a virtual address is valid

 */

#ifndef CONFIG_DISCONTIGMEM

#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET

#define pfn_valid(pfn)		((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))

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

#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)

#else /* CONFIG_DISCONTIGMEM */

#error CONFIG_DISCONTIGMEM is not supported yet.

#endif /* !CONFIG_DISCONTIGMEM */

#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

#endif

#include <asm-generic/memory_model.h>

#endif

// SPDX-License-Identifier: GPL-2.0

// Copyright (C) 2005-2017 Andes Technology Corporation

#ifndef __NDS32_MMU_H

#define __NDS32_MMU_H

typedef struct {

	unsigned int id;

	void *vdso;

} mm_context_t;

#endif

/*

 * SPDX-License-Identifier: GPL-2.0

 * Copyright (C) 2005-2017 Andes Technology Corporation

 */

#ifndef _ASMNDS32_PAGE_H

#define _ASMNDS32_PAGE_H

#ifdef CONFIG_ANDES_PAGE_SIZE_4KB

#define PAGE_SHIFT      12

#endif

#ifdef CONFIG_ANDES_PAGE_SIZE_8KB

#define PAGE_SHIFT      13

#endif

#include <linux/const.h>

#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)

#define PAGE_MASK       (~(PAGE_SIZE-1))

#ifdef __KERNEL__

#ifndef __ASSEMBLY__

struct page;

struct vm_area_struct;

#ifdef CONFIG_CPU_CACHE_ALIASING

extern void copy_user_highpage(struct page *to, struct page *from,

			       unsigned long vaddr, struct vm_area_struct *vma);

extern void clear_user_highpage(struct page *page, unsigned long vaddr);

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

#define clear_user_highpage	clear_user_highpage

#else

#define clear_user_page(page, vaddr, pg)        clear_page(page)

#define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)

#endif

void clear_page(void *page);

void copy_page(void *to, void *from);

typedef unsigned long pte_t;

typedef unsigned long pmd_t;

typedef unsigned long pgd_t;

typedef unsigned long pgprot_t;

#define pte_val(x)      (x)

#define pmd_val(x)      (x)

#define pgd_val(x)	(x)

#define pgprot_val(x)   (x)

#define __pte(x)        (x)

#define __pmd(x)        (x)

#define __pgd(x)        (x)

#define __pgprot(x)     (x)

typedef struct page *pgtable_t;

#include <asm/memory.h>

#include <asm-generic/getorder.h>

#endif /* !__ASSEMBLY__ */

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \

				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#endif /* __KERNEL__ */

#endif