[linux-2.6] / include / asm-ppc / page.h

#ifndef _PPC_PAGE_H
#define _PPC_PAGE_H

#include <linux/config.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__
#include <linux/config.h>

/* This must match what is in arch/ppc/Makefile */
#define PAGE_OFFSET	CONFIG_KERNEL_START
#define KERNELBASE	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 pfn_to_page(pfn)	(mem_map + ((pfn) - PPC_PGSTART))
#define page_to_pfn(page)	((unsigned long)((page) - mem_map) + 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 mecanism */
#define __HAVE_ARCH_GATE_AREA		1

#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 <linux/config.h>
	5	#include <asm/asm-compat.h>
	6
1da177e4 LT	7	/* PAGE_SHIFT determines the page size */
1da177e4 LT	8	#define PAGE_SHIFT 12
a7f290da	9	#define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
1da177e4 LT	10
	11	/*
	12	* Subtle: this is an int (not an unsigned long) and so it
	13	* gets extended to 64 bits the way want (i.e. with 1s). -- paulus
	14	*/
	15	#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
	16
	17	#ifdef __KERNEL__
	18	#include <linux/config.h>
	19
	20	/* This must match what is in arch/ppc/Makefile */
	21	#define PAGE_OFFSET CONFIG_KERNEL_START
	22	#define KERNELBASE PAGE_OFFSET
	23
	24	#ifndef __ASSEMBLY__
	25
	26	/*
	27	* The basic type of a PTE - 64 bits for those CPUs with > 32 bit
	28	* physical addressing. For now this just the IBM PPC440.
	29	*/
	30	#ifdef CONFIG_PTE_64BIT
	31	typedef unsigned long long pte_basic_t;
	32	#define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */
	33	#define PTE_FMT "%16Lx"
	34	#else
	35	typedef unsigned long pte_basic_t;
	36	#define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
	37	#define PTE_FMT "%.8lx"
	38	#endif
	39
7c8c6b97 PM	40	/* align addr on a size boundary - adjust address up/down if needed */
	41	#define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
	42	#define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
	43
	44	/* align addr on a size boundary - adjust address up if needed */
	45	#define _ALIGN(addr,size) _ALIGN_UP(addr,size)
	46
	47	/* to align the pointer to the (next) page boundary */
	48	#define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
	49
	50
1da177e4 LT	51	#undef STRICT_MM_TYPECHECKS
	52
	53	#ifdef STRICT_MM_TYPECHECKS
	54	/*
	55	* These are used to make use of C type-checking..
	56	*/
	57	typedef struct { pte_basic_t pte; } pte_t;
	58	typedef struct { unsigned long pmd; } pmd_t;
	59	typedef struct { unsigned long pgd; } pgd_t;
	60	typedef struct { unsigned long pgprot; } pgprot_t;
	61
	62	#define pte_val(x) ((x).pte)
	63	#define pmd_val(x) ((x).pmd)
	64	#define pgd_val(x) ((x).pgd)
	65	#define pgprot_val(x) ((x).pgprot)
	66
	67	#define __pte(x) ((pte_t) { (x) } )
	68	#define __pmd(x) ((pmd_t) { (x) } )
	69	#define __pgd(x) ((pgd_t) { (x) } )
	70	#define __pgprot(x) ((pgprot_t) { (x) } )
	71
	72	#else
	73	/*
	74	* .. while these make it easier on the compiler
	75	*/
	76	typedef pte_basic_t pte_t;
	77	typedef unsigned long pmd_t;
	78	typedef unsigned long pgd_t;
	79	typedef unsigned long pgprot_t;
	80
	81	#define pte_val(x) (x)
	82	#define pmd_val(x) (x)
	83	#define pgd_val(x) (x)
	84	#define pgprot_val(x) (x)
	85
	86	#define __pte(x) (x)
	87	#define __pmd(x) (x)
	88	#define __pgd(x) (x)
	89	#define __pgprot(x) (x)
	90
	91	#endif
	92
1da177e4 LT	93	struct page;
	94	extern void clear_pages(void *page, int order);
	95	static inline void clear_page(void *page) { clear_pages(page, 0); }
	96	extern void copy_page(void to, void from);
	97	extern void clear_user_page(void page, unsigned long vaddr, struct page pg);
	98	extern void copy_user_page(void to, void from, unsigned long vaddr,
	99	struct page *pg);
	100
	101	#ifndef CONFIG_APUS
	102	#define PPC_MEMSTART 0
	103	#define PPC_PGSTART 0
	104	#define PPC_MEMOFFSET PAGE_OFFSET
	105	#else
	106	extern unsigned long ppc_memstart;
	107	extern unsigned long ppc_pgstart;
	108	extern unsigned long ppc_memoffset;
	109	#define PPC_MEMSTART ppc_memstart
	110	#define PPC_PGSTART ppc_pgstart
	111	#define PPC_MEMOFFSET ppc_memoffset
	112	#endif
	113
	114	#if defined(CONFIG_APUS) && !defined(MODULE)
	115	/* map phys->virtual and virtual->phys for RAM pages */
	116	static inline unsigned long ___pa(unsigned long v)
	117	{
	118	unsigned long p;
	119	asm volatile ("1: addis %0, %1, %2;"
	120	".section \".vtop_fixup\",\"aw\";"
	121	".align 1;"
	122	".long 1b;"
	123	".previous;"
	124	: "=r" (p)
	125	: "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
	126
	127	return p;
	128	}
	129	static inline void* ___va(unsigned long p)
	130	{
	131	unsigned long v;
	132	asm volatile ("1: addis %0, %1, %2;"
	133	".section \".ptov_fixup\",\"aw\";"
	134	".align 1;"
	135	".long 1b;"
	136	".previous;"
	137	: "=r" (v)
	138	: "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
	139
	140	return (void*) v;
	141	}
	142	#else
	143	#define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
	144	#define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
	145	#endif
	146
	147	extern int page_is_ram(unsigned long pfn);
	148
	149	#define __pa(x) ___pa((unsigned long)(x))
	150	#define __va(x) ((void *)(___va((unsigned long)(x))))
	151
	152	#define pfn_to_page(pfn) (mem_map + ((pfn) - PPC_PGSTART))
	153	#define page_to_pfn(page) ((unsigned long)((page) - mem_map) + PPC_PGSTART)
	154	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
	155	#define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
	156
157	#define pfn_valid(pfn) (((pfn) - PPC_PGSTART) < max_mapnr)
158	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
159
160	/* Pure 2^n version of get_order */
161	extern __inline__ int get_order(unsigned long size)
162	{
163	int lz;
164
165	size = (size-1) >> PAGE_SHIFT;
166	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
167	return 32 - lz;
168	}
169
170	#endif /* __ASSEMBLY__ */
171
172	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
173	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
174
a7f290da BH	175	/* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
	176	#define __HAVE_ARCH_GATE_AREA 1
	177
1da177e4 LT	178	#endif /* __KERNEL__ */
1da177e4 LT	179	#endif /* _PPC_PAGE_H */