![Linus Torvalds](/assets/img/avatar_default.png)
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
|
|
* 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/config.h>
|
|
#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);
|
|
}
|
|
|