NetBSD/sys/arch/arm32/footbridge/footbridge_machdep.c

93 lines
3.2 KiB
C

/* $NetBSD: footbridge_machdep.c,v 1.4 2000/06/29 08:53:00 mrg Exp $ */
/*
* Copyright (c) 1997 Mark Brinicombe.
* Copyright (c) 1997 Causality Limited
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <uvm/uvm_extern.h>
#include <machine/pmap.h>
#include <machine/pte.h>
#include <arm32/footbridge/dc21285mem.h>
extern pt_entry_t *pmap_pte __P((pmap_t pmap, vm_offset_t va));
/*
* For optimal cache cleaning we need two 16K banks of
* virtual address space that NOTHING else will access
* and then we alternate the cache cleaning between the
* two banks.
* The cache cleaning code requires requires 2 banks aligned
* on total size boundry so the banks can be alternated by
* eorring the size bit (assumes the bank size is a power of 2)
*
* On the DC21285 we have a special cache clean area so we will
* use it.
*/
extern unsigned int sa110_cache_clean_addr;
extern unsigned int sa110_cache_clean_size;
#if 0
void
footbridge_sa110_cc_setup(void)
{
vm_offset_t vaddr;
vm_offset_t addr;
int cleanarea;
int loop;
pt_entry_t *pte;
cleanarea = (NBPG * 4) * 2;
vaddr = uvm_km_valloc(kernel_map, cleanarea + (NBPG * 4));
addr = (vaddr + (cleanarea - 1)) & ~(cleanarea - 1);
/* printf("vaddr=%x addr=%x\n", vaddr, addr);*/
for (loop = 0; loop < cleanarea; loop += NBPG) {
pte = pmap_pte(kernel_pmap, (addr + loop));
*pte = L2_PTE(DC28285_SA_CACHE_FLUSH_BASE + loop, AP_KR);
}
sa110_cache_clean_addr = addr;
sa110_cache_clean_size = cleanarea / 2;
}
#else
void
footbridge_sa110_cc_setup(void)
{
sa110_cache_clean_addr = DC21285_CACHE_FLUSH_VBASE;
sa110_cache_clean_size = (NBPG * 4);
}
#endif