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/* 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.
*/
static inline unsigned long virt_to_pfn(const void *kaddr)
{
return __pa(kaddr) >> PAGE_SHIFT;
}
static inline void *pfn_to_virt(unsigned long pfn)
{
return __va(pfn << PAGE_SHIFT);
}
extern int m68k_virt_to_node_shift;
#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 ARCH_PFN_OFFSET (m68k_memory[0].addr >> PAGE_SHIFT)
#define virt_addr_valid(kaddr) ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
#define pfn_valid(pfn) virt_addr_valid(pfn_to_virt(pfn))
#endif /* __ASSEMBLY__ */
#endif /* _M68K_PAGE_MM_H */
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