asm-generic: add generic NOMMU versions of some headers

#ifndef __ASM_GENERIC_CACHE_H

#define __ASM_GENERIC_CACHE_H

/*

 * 32 bytes appears to be the most common cache line size,

 * so make that the default here. Architectures with larger

 * cache lines need to provide their own cache.h.

 */

#define L1_CACHE_SHIFT		5

#define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)

#endif /* __ASM_GENERIC_CACHE_H */

#ifndef __ASM_CACHEFLUSH_H

#define __ASM_CACHEFLUSH_H

/* Keep includes the same across arches.  */

#include <linux/mm.h>

/*

 * The cache doesn't need to be flushed when TLB entries change when

 * the cache is mapped to physical memory, not virtual memory

 */

#define flush_cache_all()			do { } while (0)

#define flush_cache_mm(mm)			do { } while (0)

#define flush_cache_dup_mm(mm)			do { } while (0)

#define flush_cache_range(vma, start, end)	do { } while (0)

#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)

#define flush_dcache_page(page)			do { } while (0)

#define flush_dcache_mmap_lock(mapping)		do { } while (0)

#define flush_dcache_mmap_unlock(mapping)	do { } while (0)

#define flush_icache_range(start, end)		do { } while (0)

#define flush_icache_page(vma,pg)		do { } while (0)

#define flush_icache_user_range(vma,pg,adr,len)	do { } while (0)

#define flush_cache_vmap(start, end)		do { } while (0)

#define flush_cache_vunmap(start, end)		do { } while (0)

#define copy_to_user_page(vma, page, vaddr, dst, src, len) \

	memcpy(dst, src, len)

#define copy_from_user_page(vma, page, vaddr, dst, src, len) \

	memcpy(dst, src, len)

#endif /* __ASM_CACHEFLUSH_H */

#ifndef __ASM_GENERIC_MMU_H

#define __ASM_GENERIC_MMU_H

/*

 * This is the mmu.h header for nommu implementations.

 * Architectures with an MMU need something more complex.

 */

#ifndef __ASSEMBLY__

typedef struct {

	struct vm_list_struct	*vmlist;

	unsigned long		end_brk;

} mm_context_t;

#endif

#endif /* __ASM_GENERIC_MMU_H */

#ifndef __ASM_GENERIC_MMU_CONTEXT_H

#define __ASM_GENERIC_MMU_CONTEXT_H

/*

 * Generic hooks for NOMMU architectures, which do not need to do

 * anything special here.

 */

#include <asm-generic/mm_hooks.h>

struct task_struct;

struct mm_struct;

static inline void enter_lazy_tlb(struct mm_struct *mm,

			struct task_struct *tsk)

{

}

static inline int init_new_context(struct task_struct *tsk,

			struct mm_struct *mm)

{

	return 0;

}

static inline void destroy_context(struct mm_struct *mm)

{

}

static inline void deactivate_mm(struct task_struct *task,

			struct mm_struct *mm)

{

}

static inline void switch_mm(struct mm_struct *prev,

			struct mm_struct *next,

			struct task_struct *tsk)

{

}

static inline void activate_mm(struct mm_struct *prev_mm,

			       struct mm_struct *next_mm)

{

}

#endif /* __ASM_GENERIC_MMU_CONTEXT_H */

#ifndef __ASM_GENERIC_PAGE_H

#define __ASM_GENERIC_PAGE_H

/*

 * Generic page.h implementation, for NOMMU architectures.

 * This provides the dummy definitions for the memory management.

 */

#ifdef CONFIG_MMU

#error need to prove a real asm/page.h

#endif

/* PAGE_SHIFT determines the page size */

#define PAGE_SHIFT	12

#ifdef __ASSEMBLY__

#define PAGE_SIZE	(1 << PAGE_SHIFT)

#else

#define PAGE_SIZE	(1UL << PAGE_SHIFT)

#endif

#define PAGE_MASK	(~(PAGE_SIZE-1))

#include <asm/setup.h>

#ifndef __ASSEMBLY__

#define get_user_page(vaddr)		__get_free_page(GFP_KERNEL)

#define free_user_page(page, addr)	free_page(addr)

#define clear_page(page)	memset((page), 0, PAGE_SIZE)

#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)

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

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

/*

 * These are used to make use of C type-checking..

 */

typedef struct {

	unsigned long pte;

} pte_t;

typedef struct {

	unsigned long pmd[16];

} pmd_t;

typedef struct {

	unsigned long pgd;

} pgd_t;

typedef struct {

	unsigned long pgprot;

} pgprot_t;

typedef struct page *pgtable_t;

#define pte_val(x)	((x).pte)

#define pmd_val(x)	((&x)->pmd[0])

#define pgd_val(x)	((x).pgd)

#define pgprot_val(x)	((x).pgprot)

#define __pte(x)	((pte_t) { (x) } )

#define __pmd(x)	((pmd_t) { (x) } )

#define __pgd(x)	((pgd_t) { (x) } )

#define __pgprot(x)	((pgprot_t) { (x) } )

extern unsigned long memory_start;

extern unsigned long memory_end;

#endif /* !__ASSEMBLY__ */

#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS

#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)

#else

#define PAGE_OFFSET		(0)

#endif

#ifndef __ASSEMBLY__

#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))

#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)

#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)

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

#define virt_to_page(addr)	(mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))

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

#ifndef page_to_phys

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

#endif

#define pfn_valid(pfn)		((pfn) < max_mapnr)

#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \

				((void *)(kaddr) < (void *)memory_end))

#endif /* __ASSEMBLY__ */

#include <asm-generic/memory_model.h>

#include <asm-generic/getorder.h>

#endif /* __ASM_GENERIC_PAGE_H */