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/*
 * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
 * Copyright (C) 2004 Microtronix Datacom Ltd.
 *
 * MMU support based on asm/page.h from mips which is:
 *
 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_NIOS2_PAGE_H
#define _ASM_NIOS2_PAGE_H

#include <linux/pfn.h>
#include <linux/const.h>

/*
 * PAGE_SHIFT determines the page size
 */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(_AC(1, UL) << PAGE_SHIFT)
#define PAGE_MASK	(~(PAGE_SIZE - 1))

/*
 * PAGE_OFFSET -- the first address of the first page of memory.
 */
#define PAGE_OFFSET	\
	(CONFIG_NIOS2_MEM_BASE + CONFIG_NIOS2_KERNEL_REGION_BASE)

#ifndef __ASSEMBLY__

/*
 * This gives the physical RAM offset.
 */
#define PHYS_OFFSET		CONFIG_NIOS2_MEM_BASE

/*
 * It's normally defined only for FLATMEM config but it's
 * used in our early mem init code for all memory models.
 * So always define it.
 */
#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)

#define clear_page(page)	memset((page), 0, PAGE_SIZE)
#define copy_page(to, from)	memcpy((to), (from), PAGE_SIZE)

struct page;

extern void clear_user_page(void *addr, unsigned long vaddr, struct page *page);
extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
				struct page *to);

/*
 * These are used to make use of C type-checking.
 */
typedef struct page *pgtable_t;
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) })
#define __pgd(x)	((pgd_t) { (x) })
#define __pgprot(x)	((pgprot_t) { (x) })

extern unsigned long memory_start;
extern unsigned long memory_end;
extern unsigned long memory_size;

extern struct page *mem_map;

# define __pa(x)		\
	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
# define __va(x)		\
	((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))

#define page_to_virt(page)	\
	((void *)(((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)

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

static inline bool pfn_valid(unsigned long pfn)
{
	/* avoid <linux/mm.h> include hell */
	extern unsigned long max_mapnr;
	unsigned long pfn_offset = ARCH_PFN_OFFSET;

	return pfn >= pfn_offset && pfn < max_mapnr;
}

# define virt_to_page(vaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(vaddr)))
# define virt_addr_valid(vaddr)	pfn_valid(PFN_DOWN(virt_to_phys(vaddr)))

# define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

# define UNCAC_ADDR(addr)	\
	((void *)((unsigned)(addr) | CONFIG_NIOS2_IO_REGION_BASE))
# define CAC_ADDR(addr)		\
	((void *)(((unsigned)(addr) & ~CONFIG_NIOS2_IO_REGION_BASE) |	\
		CONFIG_NIOS2_KERNEL_REGION_BASE))

#include <asm-generic/memory_model.h>

#include <asm-generic/getorder.h>

#endif /* !__ASSEMBLY__ */

#endif /* _ASM_NIOS2_PAGE_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 958 B 0644
asm-macros.h File 6.71 KB 0644
asm-offsets.h File 813 B 0644
cache.h File 1.14 KB 0644
cacheflush.h File 1.91 KB 0644
checksum.h File 2.03 KB 0644
cpuinfo.h File 1.42 KB 0644
delay.h File 547 B 0644
dma-mapping.h File 547 B 0644
elf.h File 3.2 KB 0644
entry.h File 2.6 KB 0644
io.h File 1.72 KB 0644
irq.h File 907 B 0644
irqflags.h File 1.75 KB 0644
kgdb.h File 1.88 KB 0644
linkage.h File 809 B 0644
mmu.h File 445 B 0644
mmu_context.h File 1.69 KB 0644
page.h File 3.08 KB 0644
pgalloc.h File 1.86 KB 0644
pgtable-bits.h File 1.05 KB 0644
pgtable.h File 7.99 KB 0644
processor.h File 2.18 KB 0644
ptrace.h File 2.29 KB 0644
registers.h File 2.15 KB 0644
setup.h File 1.04 KB 0644
shmparam.h File 804 B 0644
string.h File 618 B 0644
switch_to.h File 866 B 0644
syscall.h File 2.6 KB 0644
syscalls.h File 883 B 0644
thread_info.h File 3.37 KB 0644
timex.h File 912 B 0644
tlb.h File 963 B 0644
tlbflush.h File 1.56 KB 0644
traps.h File 514 B 0644
uaccess.h File 5.18 KB 0644