Orange Pi5 kernel

/* 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 */