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 --- include/addr_map.h | 29 +++++++++++++++++ lib_generic/Makefile | 1 + lib_generic/addr_map.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 111 insertions(+), 0 deletions(-) create mode 100644 include/addr_map.h create mode 100644 lib_generic/addr_map.c
diff --git a/include/addr_map.h b/include/addr_map.h new file mode 100644 index 0000000..c87c3a8 --- /dev/null +++ b/include/addr_map.h @@ -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(unsigned int vaddr); +extern unsigned int addrmap_phys_to_virt(phys_addr_t paddr); +extern void addrmap_set_entry(unsigned int vaddr, phys_addr_t paddr, + unsigned int size, int idx); + +#endif diff --git a/lib_generic/Makefile b/lib_generic/Makefile index d62c39b..3f04022 100644 --- a/lib_generic/Makefile +++ b/lib_generic/Makefile @@ -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 diff --git a/lib_generic/addr_map.c b/lib_generic/addr_map.c new file mode 100644 index 0000000..9f6596a --- /dev/null +++ b/lib_generic/addr_map.c @@ -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; + unsigned int vaddr; + unsigned int size; +} address_map[CONFIG_SYS_NUM_ADDR_MAP]; + +phys_addr_t addrmap_virt_to_phys(unsigned int 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)vaddr; + base = (u64)(address_map[i].vaddr); + upper = (u64)(address_map[i].size) + base; + + if (addr >= base && addr < upper) { + return vaddr - address_map[i].vaddr + address_map[i].paddr; + } + } + + return (phys_addr_t)(~0); +} + +unsigned int 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; + + if (addr >= base && addr < upper) { + return paddr - address_map[i].paddr + address_map[i].paddr; + } + } + + return (unsigned int)(~0); +} + +void addrmap_set_entry(unsigned int vaddr, phys_addr_t paddr, + unsigned int 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; +}