2 * File: arch/blackfin/mm/init.c
10 * Copyright 2004-2007 Analog Devices Inc.
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, see the file COPYING, or write
26 * to the Free Software Foundation, Inc.,
27 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
30 #include <linux/swap.h>
31 #include <linux/bootmem.h>
32 #include <linux/uaccess.h>
33 #include <asm/bfin-global.h>
34 #include <asm/l1layout.h>
35 #include "blackfin_sram.h"
38 * BAD_PAGE is the page that is used for page faults when linux
39 * is out-of-memory. Older versions of linux just did a
40 * do_exit(), but using this instead means there is less risk
41 * for a process dying in kernel mode, possibly leaving a inode
44 * BAD_PAGETABLE is the accompanying page-table: it is initialized
45 * to point to BAD_PAGE entries.
47 * ZERO_PAGE is a special page that is used for zero-initialized
50 static unsigned long empty_bad_page_table;
52 static unsigned long empty_bad_page;
54 unsigned long empty_zero_page;
59 int free = 0, total = 0, reserved = 0, shared = 0;
62 printk(KERN_INFO "Mem-info:\n");
67 if (PageReserved(mem_map + i))
69 else if (PageSwapCache(mem_map + i))
71 else if (!page_count(mem_map + i))
74 shared += page_count(mem_map + i) - 1;
76 printk(KERN_INFO "%d pages of RAM\n", total);
77 printk(KERN_INFO "%d free pages\n", free);
78 printk(KERN_INFO "%d reserved pages\n", reserved);
79 printk(KERN_INFO "%d pages shared\n", shared);
80 printk(KERN_INFO "%d pages swap cached\n", cached);
84 * paging_init() continues the virtual memory environment setup which
85 * was begun by the code in arch/head.S.
86 * The parameters are pointers to where to stick the starting and ending
87 * addresses of available kernel virtual memory.
89 void __init paging_init(void)
92 * make sure start_mem is page aligned, otherwise bootmem and
93 * page_alloc get different views og the world
95 unsigned long end_mem = memory_end & PAGE_MASK;
97 pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
100 * initialize the bad page table and bad page to point
101 * to a couple of allocated pages
103 empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
104 empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
105 empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
106 memset((void *)empty_zero_page, 0, PAGE_SIZE);
109 * Set up SFC/DFC registers (user data space)
113 pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
114 PAGE_ALIGN(memory_start), end_mem);
117 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
119 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
120 zones_size[ZONE_NORMAL] = 0;
121 #ifdef CONFIG_HIGHMEM
122 zones_size[ZONE_HIGHMEM] = 0;
124 free_area_init(zones_size);
128 void __init mem_init(void)
130 unsigned int codek = 0, datak = 0, initk = 0;
131 unsigned int reservedpages = 0, freepages = 0;
133 unsigned long start_mem = memory_start;
134 unsigned long end_mem = memory_end;
136 end_mem &= PAGE_MASK;
137 high_memory = (void *)end_mem;
139 start_mem = PAGE_ALIGN(start_mem);
140 max_mapnr = num_physpages = MAP_NR(high_memory);
141 printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
143 /* This will put all memory onto the freelists. */
144 totalram_pages = free_all_bootmem();
147 for (tmp = 0; tmp < max_mapnr; tmp++)
148 if (PageReserved(pfn_to_page(tmp)))
150 freepages = max_mapnr - reservedpages;
152 /* do not count in kernel image between _rambase and _ramstart */
153 reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
154 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
155 reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
158 codek = (_etext - _stext) >> 10;
159 initk = (__init_end - __init_begin) >> 10;
160 datak = ((_ramstart - _rambase) >> 10) - codek - initk;
163 "Memory available: %luk/%luk RAM, "
164 "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
165 (unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
166 initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
168 /* Initialize the blackfin L1 Memory. */
173 /* Allocate this once; never free it. We assume this gives us a
174 pointer to the start of L1 scratchpad memory; panic if it
176 tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info));
177 if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) {
178 printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n",
179 tmp, (unsigned long)L1_SCRATCH_TASK_INFO);
180 panic("No L1, time to give up\n");
184 static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
187 /* next to check that the page we free is not a partial page */
188 for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
189 ClearPageReserved(virt_to_page(addr));
190 init_page_count(virt_to_page(addr));
194 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
197 #ifdef CONFIG_BLK_DEV_INITRD
198 void __init free_initrd_mem(unsigned long start, unsigned long end)
201 free_init_pages("initrd memory", start, end);
206 void __init_refok free_initmem(void)
208 #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
209 free_init_pages("unused kernel memory",
210 (unsigned long)(&__init_begin),
211 (unsigned long)(&__init_end));