[mirror_ubuntu-bionic-kernel.git] / arch / m68k / include / asm / page_mm.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _M68K_PAGE_MM_H
#define _M68K_PAGE_MM_H

#ifndef __ASSEMBLY__

#include <linux/compiler.h>
#include <asm/module.h>

/*
 * We don't need to check for alignment etc.
 */
#ifdef CPU_M68040_OR_M68060_ONLY
static inline void copy_page(void *to, void *from)
{
  unsigned long tmp;

  __asm__ __volatile__("1:\t"
		       ".chip 68040\n\t"
		       "move16 %1@+,%0@+\n\t"
		       "move16 %1@+,%0@+\n\t"
		       ".chip 68k\n\t"
		       "dbra  %2,1b\n\t"
		       : "=a" (to), "=a" (from), "=d" (tmp)
		       : "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
		       );
}

static inline void clear_page(void *page)
{
	unsigned long tmp;
	unsigned long *sp = page;

	*sp++ = 0;
	*sp++ = 0;
	*sp++ = 0;
	*sp++ = 0;

	__asm__ __volatile__("1:\t"
			     ".chip 68040\n\t"
			     "move16 %2@+,%0@+\n\t"
			     ".chip 68k\n\t"
			     "subqw  #8,%2\n\t"
			     "subqw  #8,%2\n\t"
			     "dbra   %1,1b\n\t"
			     : "=a" (sp), "=d" (tmp)
			     : "a" (page), "0" (sp),
			       "1" ((PAGE_SIZE - 16) / 16 - 1));
}

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

#define clear_user_page(addr, vaddr, page)	\
	do {	clear_page(addr);		\
		flush_dcache_page(page);	\
	} while (0)
#define copy_user_page(to, from, vaddr, page)	\
	do {	copy_page(to, from);		\
		flush_dcache_page(page);	\
	} while (0)

extern unsigned long m68k_memoffset;

#ifndef CONFIG_SUN3

#define WANT_PAGE_VIRTUAL

static inline unsigned long ___pa(void *vaddr)
{
	unsigned long paddr;
	asm (
		"1:	addl #0,%0\n"
		m68k_fixup(%c2, 1b+2)
		: "=r" (paddr)
		: "0" (vaddr), "i" (m68k_fixup_memoffset));
	return paddr;
}
#define __pa(vaddr)	___pa((void *)(long)(vaddr))
static inline void *__va(unsigned long paddr)
{
	void *vaddr;
	asm (
		"1:	subl #0,%0\n"
		m68k_fixup(%c2, 1b+2)
		: "=r" (vaddr)
		: "0" (paddr), "i" (m68k_fixup_memoffset));
	return vaddr;
}

#else	/* !CONFIG_SUN3 */
/* This #define is a horrible hack to suppress lots of warnings. --m */
#define __pa(x) ___pa((unsigned long)(x))
static inline unsigned long ___pa(unsigned long x)
{
     if(x == 0)
	  return 0;
     if(x >= PAGE_OFFSET)
        return (x-PAGE_OFFSET);
     else
        return (x+0x2000000);
}

static inline void *__va(unsigned long x)
{
     if(x == 0)
	  return (void *)0;

     if(x < 0x2000000)
        return (void *)(x+PAGE_OFFSET);
     else
        return (void *)(x-0x2000000);
}
#endif	/* CONFIG_SUN3 */

/*
 * NOTE: virtual isn't really correct, actually it should be the offset into the
 * memory node, but we have no highmem, so that works for now.
 * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
 * of the shifts unnecessary.
 */
#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)

extern int m68k_virt_to_node_shift;

#ifdef CONFIG_SINGLE_MEMORY_CHUNK
#define __virt_to_node(addr)	(&pg_data_map[0])
#else
extern struct pglist_data *pg_data_table[];

static inline __attribute_const__ int __virt_to_node_shift(void)
{
	int shift;

	asm (
		"1:	moveq	#0,%0\n"
		m68k_fixup(%c1, 1b)
		: "=d" (shift)
		: "i" (m68k_fixup_vnode_shift));
	return shift;
}

#define __virt_to_node(addr)	(pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
#endif

#define virt_to_page(addr) ({						\
	pfn_to_page(virt_to_pfn(addr));					\
})
#define page_to_virt(page) ({						\
	pfn_to_virt(page_to_pfn(page));					\
})

#define pfn_to_page(pfn) ({						\
	unsigned long __pfn = (pfn);					\
	struct pglist_data *pgdat;					\
	pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn));	\
	pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn);		\
})
#define page_to_pfn(_page) ({						\
	const struct page *__p = (_page);				\
	struct pglist_data *pgdat;					\
	pgdat = &pg_data_map[page_to_nid(__p)];				\
	((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn;		\
})

#define virt_addr_valid(kaddr)	((void *)(kaddr) >= (void *)PAGE_OFFSET && (void *)(kaddr) < high_memory)
#define pfn_valid(pfn)		virt_addr_valid(pfn_to_virt(pfn))

#endif /* __ASSEMBLY__ */

#endif /* _M68K_PAGE_MM_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
138ff346 GU	2	#ifndef _M68K_PAGE_MM_H
138ff346 GU	3	#define _M68K_PAGE_MM_H
1da177e4	4
1da177e4 LT	5	#ifndef __ASSEMBLY__
1da177e4 LT	6
4f855897	7	#include <linux/compiler.h>
fbe9c961 RZ	8	#include <asm/module.h>
fbe9c961 RZ	9
1da177e4 LT	10	/*
	11	* We don't need to check for alignment etc.
	12	*/
	13	#ifdef CPU_M68040_OR_M68060_ONLY
	14	static inline void copy_page(void to, void from)
	15	{
	16	unsigned long tmp;
	17
	18	__asm__ __volatile__("1:\t"
	19	".chip 68040\n\t"
	20	"move16 %1@+,%0@+\n\t"
	21	"move16 %1@+,%0@+\n\t"
	22	".chip 68k\n\t"
	23	"dbra %2,1b\n\t"
	24	: "=a" (to), "=a" (from), "=d" (tmp)
	25	: "0" (to), "1" (from) , "2" (PAGE_SIZE / 32 - 1)
	26	);
	27	}
	28
	29	static inline void clear_page(void *page)
	30	{
	31	unsigned long tmp;
	32	unsigned long *sp = page;
	33
	34	*sp++ = 0;
	35	*sp++ = 0;
	36	*sp++ = 0;
	37	*sp++ = 0;
	38
	39	__asm__ __volatile__("1:\t"
	40	".chip 68040\n\t"
	41	"move16 %2@+,%0@+\n\t"
	42	".chip 68k\n\t"
	43	"subqw #8,%2\n\t"
	44	"subqw #8,%2\n\t"
	45	"dbra %1,1b\n\t"
	46	: "=a" (sp), "=d" (tmp)
	47	: "a" (page), "0" (sp),
	48	"1" ((PAGE_SIZE - 16) / 16 - 1));
	49	}
	50
	51	#else
	52	#define clear_page(page) memset((page), 0, PAGE_SIZE)
	53	#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
	54	#endif
	55
	56	#define clear_user_page(addr, vaddr, page) \
	57	do { clear_page(addr); \
	58	flush_dcache_page(page); \
	59	} while (0)
	60	#define copy_user_page(to, from, vaddr, page) \
	61	do { copy_page(to, from); \
	62	flush_dcache_page(page); \
	63	} while (0)
	64
fbe9c961 RZ	65	extern unsigned long m68k_memoffset;
fbe9c961 RZ	66
1da177e4 LT	67	#ifndef CONFIG_SUN3
	68
	69	#define WANT_PAGE_VIRTUAL
1da177e4	70
fbe9c961 RZ	71	static inline unsigned long ___pa(void *vaddr)
	72	{
	73	unsigned long paddr;
	74	asm (
	75	"1: addl #0,%0\n"
	76	m68k_fixup(%c2, 1b+2)
	77	: "=r" (paddr)
	78	: "0" (vaddr), "i" (m68k_fixup_memoffset));
	79	return paddr;
	80	}
22e58f9d	81	#define __pa(vaddr) ___pa((void *)(long)(vaddr))
fbe9c961 RZ	82	static inline void *__va(unsigned long paddr)
	83	{
	84	void *vaddr;
	85	asm (
	86	"1: subl #0,%0\n"
	87	m68k_fixup(%c2, 1b+2)
	88	: "=r" (vaddr)
	89	: "0" (paddr), "i" (m68k_fixup_memoffset));
	90	return vaddr;
	91	}
	92
1da177e4 LT	93	#else /* !CONFIG_SUN3 */
1da177e4 LT	94	/* This #define is a horrible hack to suppress lots of warnings. --m */
40bb0c3e	95	#define __pa(x) ___pa((unsigned long)(x))
1da177e4 LT	96	static inline unsigned long ___pa(unsigned long x)
	97	{
	98	if(x == 0)
	99	return 0;
	100	if(x >= PAGE_OFFSET)
	101	return (x-PAGE_OFFSET);
	102	else
	103	return (x+0x2000000);
	104	}
	105
	106	static inline void *__va(unsigned long x)
	107	{
	108	if(x == 0)
	109	return (void *)0;
	110
	111	if(x < 0x2000000)
	112	return (void *)(x+PAGE_OFFSET);
	113	else
	114	return (void *)(x-0x2000000);
	115	}
	116	#endif /* CONFIG_SUN3 */
	117
	118	/*
	119	* NOTE: virtual isn't really correct, actually it should be the offset into the
	120	* memory node, but we have no highmem, so that works for now.
	121	* TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots
	122	* of the shifts unnecessary.
	123	*/
	124	#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
	125	#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
	126
12d810c1 RZ	127	extern int m68k_virt_to_node_shift;
	128
	129	#ifdef CONFIG_SINGLE_MEMORY_CHUNK
	130	#define __virt_to_node(addr) (&pg_data_map[0])
	131	#else
	132	extern struct pglist_data *pg_data_table[];
	133
	134	static inline __attribute_const__ int __virt_to_node_shift(void)
	135	{
	136	int shift;
	137
	138	asm (
	139	"1: moveq #0,%0\n"
	140	m68k_fixup(%c1, 1b)
	141	: "=d" (shift)
	142	: "i" (m68k_fixup_vnode_shift));
	143	return shift;
	144	}
	145
	146	#define __virt_to_node(addr) (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
	147	#endif
1da177e4	148
12d810c1 RZ	149	#define virt_to_page(addr) ({ \
	150	pfn_to_page(virt_to_pfn(addr)); \
	151	})
	152	#define page_to_virt(page) ({ \
	153	pfn_to_virt(page_to_pfn(page)); \
	154	})
	155
	156	#define pfn_to_page(pfn) ({ \
	157	unsigned long __pfn = (pfn); \
	158	struct pglist_data *pgdat; \
	159	pgdat = __virt_to_node((unsigned long)pfn_to_virt(__pfn)); \
	160	pgdat->node_mem_map + (__pfn - pgdat->node_start_pfn); \
	161	})
	162	#define page_to_pfn(_page) ({ \
ba8f3184	163	const struct page *__p = (_page); \
12d810c1 RZ	164	struct pglist_data *pgdat; \
	165	pgdat = &pg_data_map[page_to_nid(__p)]; \
	166	((__p) - pgdat->node_mem_map) + pgdat->node_start_pfn; \
	167	})
1da177e4 LT	168
	169	#define virt_addr_valid(kaddr) ((void )(kaddr) >= (void )PAGE_OFFSET && (void *)(kaddr) < high_memory)
	170	#define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn))
	171
	172	#endif /* __ASSEMBLY__ */
	173
138ff346	174	#endif /* _M68K_PAGE_MM_H */