diff options
Diffstat (limited to 'arch/blackfin/mm/init.c')
| -rw-r--r-- | arch/blackfin/mm/init.c | 159 |
1 files changed, 37 insertions, 122 deletions
diff --git a/arch/blackfin/mm/init.c b/arch/blackfin/mm/init.c index 68bd0bd680c..166842de3dc 100644 --- a/arch/blackfin/mm/init.c +++ b/arch/blackfin/mm/init.c @@ -1,58 +1,26 @@ /* - * File: arch/blackfin/mm/init.c - * Based on: - * Author: + * Copyright 2004-2009 Analog Devices Inc. * - * Created: - * Description: - * - * Modified: - * Copyright 2004-2007 Analog Devices Inc. - * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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, see the file COPYING, or write - * to the Free Software Foundation, Inc., - * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * Licensed under the GPL-2 or later. */ +#include <linux/gfp.h> #include <linux/swap.h> #include <linux/bootmem.h> #include <linux/uaccess.h> +#include <linux/export.h> #include <asm/bfin-global.h> #include <asm/pda.h> #include <asm/cplbinit.h> +#include <asm/early_printk.h> #include "blackfin_sram.h" /* - * BAD_PAGE is the page that is used for page faults when linux - * is out-of-memory. Older versions of linux just did a - * do_exit(), but using this instead means there is less risk - * for a process dying in kernel mode, possibly leaving a inode - * unused etc.. - * - * BAD_PAGETABLE is the accompanying page-table: it is initialized - * to point to BAD_PAGE entries. - * - * ZERO_PAGE is a special page that is used for zero-initialized - * data and COW. + * ZERO_PAGE is a special page that is used for zero-initialized data and COW. + * Let the bss do its zero-init magic so we don't have to do it ourselves. */ -static unsigned long empty_bad_page_table; - -static unsigned long empty_bad_page; - -static unsigned long empty_zero_page; +char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE))); +EXPORT_SYMBOL(empty_zero_page); #ifndef CONFIG_EXCEPTION_L1_SCRATCH #if defined CONFIG_SYSCALL_TAB_L1 @@ -73,55 +41,41 @@ EXPORT_SYMBOL(cpu_pda); void __init paging_init(void) { /* - * make sure start_mem is page aligned, otherwise bootmem and - * page_alloc get different views og the world + * make sure start_mem is page aligned, otherwise bootmem and + * page_alloc get different views of the world */ unsigned long end_mem = memory_end & PAGE_MASK; - pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem); - - /* - * initialize the bad page table and bad page to point - * to a couple of allocated pages - */ - empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); - empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); - empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); - memset((void *)empty_zero_page, 0, PAGE_SIZE); + unsigned long zones_size[MAX_NR_ZONES] = { + [0] = 0, + [ZONE_DMA] = (end_mem - CONFIG_PHY_RAM_BASE_ADDRESS) >> PAGE_SHIFT, + [ZONE_NORMAL] = 0, +#ifdef CONFIG_HIGHMEM + [ZONE_HIGHMEM] = 0, +#endif + }; - /* - * Set up SFC/DFC registers (user data space) - */ + /* Set up SFC/DFC registers (user data space) */ set_fs(KERNEL_DS); - pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n", + pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem); - - { - unsigned long zones_size[MAX_NR_ZONES] = { 0, }; - - zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; - zones_size[ZONE_NORMAL] = 0; -#ifdef CONFIG_HIGHMEM - zones_size[ZONE_HIGHMEM] = 0; -#endif - free_area_init(zones_size); - } + free_area_init_node(0, zones_size, + CONFIG_PHY_RAM_BASE_ADDRESS >> PAGE_SHIFT, NULL); } asmlinkage void __init init_pda(void) { unsigned int cpu = raw_smp_processor_id(); + early_shadow_stamp(); + /* Initialize the PDA fields holding references to other parts of the memory. The content of such memory is still undefined at the time of the call, we are only setting up valid pointers to it. */ memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu])); - cpu_pda[0].next = &cpu_pda[1]; - cpu_pda[1].next = &cpu_pda[0]; - #ifdef CONFIG_EXCEPTION_L1_SCRATCH cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \ L1_SCRATCH_LENGTH); @@ -136,63 +90,24 @@ asmlinkage void __init init_pda(void) void __init mem_init(void) { - unsigned int codek = 0, datak = 0, initk = 0; - unsigned int reservedpages = 0, freepages = 0; - unsigned long tmp; - unsigned long start_mem = memory_start; - unsigned long end_mem = memory_end; - - end_mem &= PAGE_MASK; - high_memory = (void *)end_mem; - - start_mem = PAGE_ALIGN(start_mem); - max_mapnr = num_physpages = MAP_NR(high_memory); - printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages); - - /* This will put all memory onto the freelists. */ - totalram_pages = free_all_bootmem(); - - reservedpages = 0; - for (tmp = 0; tmp < max_mapnr; tmp++) - if (PageReserved(pfn_to_page(tmp))) - reservedpages++; - freepages = max_mapnr - reservedpages; - - /* do not count in kernel image between _rambase and _ramstart */ - reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT; -#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263) - reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT; -#endif + char buf[64]; - codek = (_etext - _stext) >> 10; - initk = (__init_end - __init_begin) >> 10; - datak = ((_ramstart - _rambase) >> 10) - codek - initk; + high_memory = (void *)(memory_end & PAGE_MASK); + max_mapnr = MAP_NR(high_memory); + printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", max_mapnr); - printk(KERN_INFO - "Memory available: %luk/%luk RAM, " - "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n", - (unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10, - initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10))); -} + /* This will put all low memory onto the freelists. */ + free_all_bootmem(); -static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end) -{ - unsigned long addr; - /* next to check that the page we free is not a partial page */ - for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) { - ClearPageReserved(virt_to_page(addr)); - init_page_count(virt_to_page(addr)); - free_page(addr); - totalram_pages++; - } - printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); + snprintf(buf, sizeof(buf) - 1, "%uK DMA", DMA_UNCACHED_REGION >> 10); + mem_init_print_info(buf); } #ifdef CONFIG_BLK_DEV_INITRD void __init free_initrd_mem(unsigned long start, unsigned long end) { #ifndef CONFIG_MPU - free_init_pages("initrd memory", start, end); + free_reserved_area((void *)start, (void *)end, -1, "initrd"); #endif } #endif @@ -200,8 +115,8 @@ void __init free_initrd_mem(unsigned long start, unsigned long end) void __init_refok free_initmem(void) { #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU - free_init_pages("unused kernel memory", - (unsigned long)(&__init_begin), - (unsigned long)(&__init_end)); + free_initmem_default(-1); + if (memory_start == (unsigned long)(&__init_end)) + memory_start = (unsigned long)(&__init_begin); #endif } |