[deliverable/linux.git] / include / asm-ppc / page.h

#ifndef _PPC_PAGE_H
#define _PPC_PAGE_H

#include <asm/asm-compat.h>

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT	12
#define PAGE_SIZE	(ASM_CONST(1) << PAGE_SHIFT)

/*
 * Subtle: this is an int (not an unsigned long) and so it
 * gets extended to 64 bits the way want (i.e. with 1s).  -- paulus
 */
#define PAGE_MASK	(~((1 << PAGE_SHIFT) - 1))

#ifdef __KERNEL__

/* This must match what is in arch/ppc/Makefile */
#define PAGE_OFFSET	CONFIG_KERNEL_START
#define KERNELBASE	PAGE_OFFSET
#define is_kernel_addr(x)	((x) >= PAGE_OFFSET)

#ifndef __ASSEMBLY__

/*
 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
 * physical addressing.  For now this just the IBM PPC440.
 */
#ifdef CONFIG_PTE_64BIT
typedef unsigned long long pte_basic_t;
#define PTE_SHIFT	(PAGE_SHIFT - 3)	/* 512 ptes per page */
#define PTE_FMT		"%16Lx"
#else
typedef unsigned long pte_basic_t;
#define PTE_SHIFT	(PAGE_SHIFT - 2)	/* 1024 ptes per page */
#define PTE_FMT		"%.8lx"
#endif

/* align addr on a size boundary - adjust address up/down if needed */
#define _ALIGN_UP(addr,size)	(((addr)+((size)-1))&(~((size)-1)))
#define _ALIGN_DOWN(addr,size)	((addr)&(~((size)-1)))

/* align addr on a size boundary - adjust address up if needed */
#define _ALIGN(addr,size)     _ALIGN_UP(addr,size)

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	_ALIGN(addr, PAGE_SIZE)


#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS
/*
 * These are used to make use of C type-checking..
 */
typedef struct { pte_basic_t pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;

#define pte_val(x)	((x).pte)
#define pmd_val(x)	((x).pmd)
#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) } )

#else
/*
 * .. while these make it easier on the compiler
 */
typedef pte_basic_t 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)

#endif

struct page;
extern void clear_pages(void *page, int order);
static inline void clear_page(void *page) { clear_pages(page, 0); }
extern void copy_page(void *to, void *from);
extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long vaddr,
			   struct page *pg);

#ifndef CONFIG_APUS
#define PPC_MEMSTART	0
#define PPC_PGSTART	0
#define PPC_MEMOFFSET	PAGE_OFFSET
#else
extern unsigned long ppc_memstart;
extern unsigned long ppc_pgstart;
extern unsigned long ppc_memoffset;
#define PPC_MEMSTART	ppc_memstart
#define PPC_PGSTART	ppc_pgstart
#define PPC_MEMOFFSET	ppc_memoffset
#endif

#if defined(CONFIG_APUS) && !defined(MODULE)
/* map phys->virtual and virtual->phys for RAM pages */
static inline unsigned long ___pa(unsigned long v)
{
	unsigned long p;
	asm volatile ("1: addis %0, %1, %2;"
		      ".section \".vtop_fixup\",\"aw\";"
		      ".align  1;"
		      ".long   1b;"
		      ".previous;"
		      : "=r" (p)
		      : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));

	return p;
}
static inline void* ___va(unsigned long p)
{
	unsigned long v;
	asm volatile ("1: addis %0, %1, %2;"
		      ".section \".ptov_fixup\",\"aw\";"
		      ".align  1;"
		      ".long   1b;"
		      ".previous;"
		      : "=r" (v)
		      : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));

	return (void*) v;
}
#else
#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
#endif

extern int page_is_ram(unsigned long pfn);

#define __pa(x) ___pa((unsigned long)(x))
#define __va(x) ((void *)(___va((unsigned long)(x))))

#define ARCH_PFN_OFFSET		(PPC_PGSTART)
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define page_to_virt(page)	__va(page_to_pfn(page) << PAGE_SHIFT)

#define pfn_valid(pfn)		(((pfn) - PPC_PGSTART) < max_mapnr)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

/* Pure 2^n version of get_order */
extern __inline__ int get_order(unsigned long size)
{
	int lz;

	size = (size-1) >> PAGE_SHIFT;
	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
	return 32 - lz;
}

#endif /* __ASSEMBLY__ */

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

/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
#define __HAVE_ARCH_GATE_AREA		1

#include <asm-generic/memory_model.h>
#endif /* __KERNEL__ */
#endif /* _PPC_PAGE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _PPC_PAGE_H
	2	#define _PPC_PAGE_H
	3
a7f290da BH	4	#include <asm/asm-compat.h>
a7f290da BH	5
1da177e4 LT	6	/* PAGE_SHIFT determines the page size */
1da177e4 LT	7	#define PAGE_SHIFT 12
a7f290da	8	#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
1da177e4 LT	9
	10	/*
	11	* Subtle: this is an int (not an unsigned long) and so it
	12	* gets extended to 64 bits the way want (i.e. with 1s). -- paulus
	13	*/
	14	#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
	15
	16	#ifdef __KERNEL__
1da177e4 LT	17
	18	/* This must match what is in arch/ppc/Makefile */
	19	#define PAGE_OFFSET CONFIG_KERNEL_START
	20	#define KERNELBASE PAGE_OFFSET
e4de0021	21	#define is_kernel_addr(x) ((x) >= PAGE_OFFSET)
1da177e4 LT	22
	23	#ifndef __ASSEMBLY__
	24
	25	/*
	26	* The basic type of a PTE - 64 bits for those CPUs with > 32 bit
	27	* physical addressing. For now this just the IBM PPC440.
	28	*/
	29	#ifdef CONFIG_PTE_64BIT
	30	typedef unsigned long long pte_basic_t;
	31	#define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */
	32	#define PTE_FMT "%16Lx"
	33	#else
	34	typedef unsigned long pte_basic_t;
	35	#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
	36	#define PTE_FMT "%.8lx"
	37	#endif
	38
7c8c6b97 PM	39	/* align addr on a size boundary - adjust address up/down if needed */
	40	#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
	41	#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
	42
	43	/* align addr on a size boundary - adjust address up if needed */
	44	#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
	45
	46	/* to align the pointer to the (next) page boundary */
	47	#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
	48
	49
1da177e4 LT	50	#undef STRICT_MM_TYPECHECKS
	51
	52	#ifdef STRICT_MM_TYPECHECKS
	53	/*
	54	* These are used to make use of C type-checking..
	55	*/
	56	typedef struct { pte_basic_t pte; } pte_t;
	57	typedef struct { unsigned long pmd; } pmd_t;
	58	typedef struct { unsigned long pgd; } pgd_t;
	59	typedef struct { unsigned long pgprot; } pgprot_t;
	60
	61	#define pte_val(x) ((x).pte)
	62	#define pmd_val(x) ((x).pmd)
	63	#define pgd_val(x) ((x).pgd)
	64	#define pgprot_val(x) ((x).pgprot)
	65
	66	#define __pte(x) ((pte_t) { (x) } )
	67	#define __pmd(x) ((pmd_t) { (x) } )
	68	#define __pgd(x) ((pgd_t) { (x) } )
	69	#define __pgprot(x) ((pgprot_t) { (x) } )
	70
	71	#else
	72	/*
	73	* .. while these make it easier on the compiler
	74	*/
	75	typedef pte_basic_t pte_t;
	76	typedef unsigned long pmd_t;
	77	typedef unsigned long pgd_t;
	78	typedef unsigned long pgprot_t;
	79
	80	#define pte_val(x) (x)
	81	#define pmd_val(x) (x)
	82	#define pgd_val(x) (x)
	83	#define pgprot_val(x) (x)
	84
	85	#define __pte(x) (x)
	86	#define __pmd(x) (x)
	87	#define __pgd(x) (x)
	88	#define __pgprot(x) (x)
	89
	90	#endif
	91
1da177e4 LT	92	struct page;
	93	extern void clear_pages(void *page, int order);
	94	static inline void clear_page(void *page) { clear_pages(page, 0); }
	95	extern void copy_page(void to, void from);
	96	extern void clear_user_page(void page, unsigned long vaddr, struct page pg);
	97	extern void copy_user_page(void to, void from, unsigned long vaddr,
	98	struct page *pg);
	99
	100	#ifndef CONFIG_APUS
	101	#define PPC_MEMSTART 0
	102	#define PPC_PGSTART 0
	103	#define PPC_MEMOFFSET PAGE_OFFSET
	104	#else
	105	extern unsigned long ppc_memstart;
	106	extern unsigned long ppc_pgstart;
	107	extern unsigned long ppc_memoffset;
	108	#define PPC_MEMSTART ppc_memstart
	109	#define PPC_PGSTART ppc_pgstart
	110	#define PPC_MEMOFFSET ppc_memoffset
	111	#endif
	112
	113	#if defined(CONFIG_APUS) && !defined(MODULE)
	114	/* map phys->virtual and virtual->phys for RAM pages */
	115	static inline unsigned long ___pa(unsigned long v)
	116	{
	117	unsigned long p;
	118	asm volatile ("1: addis %0, %1, %2;"
	119	".section \".vtop_fixup\",\"aw\";"
	120	".align 1;"
	121	".long 1b;"
	122	".previous;"
	123	: "=r" (p)
	124	: "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
	125
	126	return p;
	127	}
	128	static inline void* ___va(unsigned long p)
	129	{
	130	unsigned long v;
	131	asm volatile ("1: addis %0, %1, %2;"
	132	".section \".ptov_fixup\",\"aw\";"
	133	".align 1;"
	134	".long 1b;"
	135	".previous;"
	136	: "=r" (v)
	137	: "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
	138
	139	return (void*) v;
	140	}
	141	#else
	142	#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
	143	#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
	144	#endif
	145
	146	extern int page_is_ram(unsigned long pfn);
	147
	148	#define __pa(x) ___pa((unsigned long)(x))
	149	#define __va(x) ((void *)(___va((unsigned long)(x))))
	150
f68d4c99	151	#define ARCH_PFN_OFFSET (PPC_PGSTART)
1da177e4 LT	152	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	153	#define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
	154
	155	#define pfn_valid(pfn) (((pfn) - PPC_PGSTART) < max_mapnr)
	156	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	157
	158	/* Pure 2^n version of get_order */
	159	extern __inline__ int get_order(unsigned long size)
	160	{
	161	int lz;
	162
	163	size = (size-1) >> PAGE_SHIFT;
	164	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
	165	return 32 - lz;
	166	}
	167
	168	#endif /* __ASSEMBLY__ */
	169
	170	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
	171	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
	172
b3c2ffd5	173	/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
a7f290da BH	174	#define __HAVE_ARCH_GATE_AREA 1
a7f290da BH	175
f68d4c99	176	#include <asm-generic/memory_model.h>
1da177e4 LT	177	#endif /* __KERNEL__ */
1da177e4 LT	178	#endif /* _PPC_PAGE_H */