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/*
* linux/arch/m68knommu/mm/memory.c
*
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
* Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
*
* Based on:
*
* linux/arch/m68k/mm/memory.c
*
* Copyright (C) 1995 Hamish Macdonald
*/
#include <linux/mm.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>
#include <asm/traps.h>
#include <asm/io.h>
/*
* cache_clear() semantics: Clear any cache entries for the area in question,
* without writing back dirty entries first. This is useful if the data will
* be overwritten anyway, e.g. by DMA to memory. The range is defined by a
* _physical_ address.
*/
void cache_clear (unsigned long paddr, int len)
{
}
/*
* Define cache invalidate functions. The ColdFire 5407 is really
* the only processor that needs to do some work here. Anything
* that has separate data and instruction caches will be a problem.
*/
#ifdef CONFIG_M5407
static __inline__ void cache_invalidate_lines(unsigned long paddr, int len)
{
unsigned long sset, eset;
sset = (paddr & 0x00000ff0);
eset = ((paddr + len) & 0x0000ff0) + 0x10;
__asm__ __volatile__ (
"nop\n\t"
"clrl %%d0\n\t"
"1:\n\t"
"movel %0,%%a0\n\t"
"addl %%d0,%%a0\n\t"
"2:\n\t"
".word 0xf4e8\n\t"
"addl #0x10,%%a0\n\t"
"cmpl %1,%%a0\n\t"
"blt 2b\n\t"
"addql #1,%%d0\n\t"
"cmpil #4,%%d0\n\t"
"bne 1b"
: : "a" (sset), "a" (eset) : "d0", "a0" );
}
#else
#define cache_invalidate_lines(a,b)
#endif
/*
* cache_push() semantics: Write back any dirty cache data in the given area,
* and invalidate the range in the instruction cache. It needs not (but may)
* invalidate those entries also in the data cache. The range is defined by a
* _physical_ address.
*/
void cache_push (unsigned long paddr, int len)
{
cache_invalidate_lines(paddr, len);
}
/*
* cache_push_v() semantics: Write back any dirty cache data in the given
* area, and invalidate those entries at least in the instruction cache. This
* is intended to be used after data has been written that can be executed as
* code later. The range is defined by a _user_mode_ _virtual_ address (or,
* more exactly, the space is defined by the %sfc/%dfc register.)
*/
void cache_push_v (unsigned long vaddr, int len)
{
cache_invalidate_lines(vaddr, len);
}
/* Map some physical address range into the kernel address space. The
* code is copied and adapted from map_chunk().
*/
unsigned long kernel_map(unsigned long paddr, unsigned long size,
int nocacheflag, unsigned long *memavailp )
{
return paddr;
}
int is_in_rom(unsigned long addr)
{
extern unsigned long _ramstart, _ramend;
/*
* What we are really trying to do is determine if addr is
* in an allocated kernel memory region. If not then assume
* we cannot free it or otherwise de-allocate it. Ideally
* we could restrict this to really being in a ROM or flash,
* but that would need to be done on a board by board basis,
* not globally.
*/
if ((addr < _ramstart) || (addr >= _ramend))
return(1);
/* Default case, not in ROM */
return(0);
}
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