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Introduce addr_map library 

Add a library that helps in translating between virtual and physical
addresses.  This library can be useful as a simple means to implement
map_physmem() and virt_to_phys() for platforms that need functionality
beyond the simple 1:1 mapping.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Kumar Gala 2008-12-13 17:20:28 -06:00 committed by Wolfgang Denk
parent 65e43a1063
commit 63240ba88c
3 changed files with 111 additions and 0 deletions
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29
include/addr_map.h Normal file
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@ -0,0 +1,29 @@
#ifndef __ADDR_MAP_H
#define __ADDR_MAP_H
/*
* Copyright 2008 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <asm/types.h>
extern phys_addr_t addrmap_virt_to_phys(void *vaddr);
extern unsigned long addrmap_phys_to_virt(phys_addr_t paddr);
extern void addrmap_set_entry(unsigned long vaddr, phys_addr_t paddr,
phys_size_t size, int idx);
#endif

1
lib_generic/Makefile
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@ -25,6 +25,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)libgeneric.a
COBJS-$(CONFIG_ADDR_MAP) += addr_map.o
COBJS-y += bzlib.o
COBJS-y += bzlib_crctable.o
COBJS-y += bzlib_decompress.o

81
lib_generic/addr_map.c Normal file
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@ -0,0 +1,81 @@
/*
* Copyright 2008 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* Version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <addr_map.h>
static struct {
phys_addr_t paddr;
phys_size_t size;
unsigned long vaddr;
} address_map[CONFIG_SYS_NUM_ADDR_MAP];
phys_addr_t addrmap_virt_to_phys(void * vaddr)
{
int i;
for (i = 0; i < CONFIG_SYS_NUM_ADDR_MAP; i++) {
u64 base, upper, addr;
if (address_map[i].size == 0)
continue;
addr = (u64)((u32)vaddr);
base = (u64)(address_map[i].vaddr);
upper = (u64)(address_map[i].size) + base - 1;
if (addr >= base && addr <= upper) {
return addr - address_map[i].vaddr + address_map[i].paddr;
}
}
return (phys_addr_t)(~0);
}
unsigned long addrmap_phys_to_virt(phys_addr_t paddr)
{
int i;
for (i = 0; i < CONFIG_SYS_NUM_ADDR_MAP; i++) {
u64 base, upper, addr;
if (address_map[i].size == 0)
continue;
addr = (u64)paddr;
base = (u64)(address_map[i].paddr);
upper = (u64)(address_map[i].size) + base - 1;
if (addr >= base && addr <= upper) {
return paddr - address_map[i].paddr + address_map[i].vaddr;
}
}
return (unsigned long)(~0);
}
void addrmap_set_entry(unsigned long vaddr, phys_addr_t paddr,
phys_size_t size, int idx)
{
if (idx > CONFIG_SYS_NUM_ADDR_MAP)
return;
address_map[idx].vaddr = vaddr;
address_map[idx].paddr = paddr;
address_map[idx].size = size;
}