blob: 014a55abd09a4999731871efd6e095ad6951f26c [file] [log] [blame]
Bryan Wu1394f032007-05-06 14:50:22 -07001/*
2 * File: arch/blackfin/mm/init.c
3 * Based on:
4 * Author:
5 *
6 * Created:
7 * Description:
8 *
9 * Modified:
Mike Frysinger321f6e02007-06-11 15:31:30 +080010 * Copyright 2004-2007 Analog Devices Inc.
Bryan Wu1394f032007-05-06 14:50:22 -070011 *
12 * Bugs: Enter bugs at http://blackfin.uclinux.org/
13 *
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.
18 *
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.
23 *
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
28 */
29
30#include <linux/swap.h>
31#include <linux/bootmem.h>
Mike Frysinger1f83b8f2007-07-12 22:58:21 +080032#include <linux/uaccess.h>
Bryan Wu1394f032007-05-06 14:50:22 -070033#include <asm/bfin-global.h>
Graf Yang8f658732008-11-18 17:48:22 +080034#include <asm/pda.h>
35#include <asm/cplbinit.h>
Bryan Wu1394f032007-05-06 14:50:22 -070036#include "blackfin_sram.h"
37
38/*
39 * BAD_PAGE is the page that is used for page faults when linux
40 * is out-of-memory. Older versions of linux just did a
41 * do_exit(), but using this instead means there is less risk
42 * for a process dying in kernel mode, possibly leaving a inode
43 * unused etc..
44 *
45 * BAD_PAGETABLE is the accompanying page-table: it is initialized
46 * to point to BAD_PAGE entries.
47 *
48 * ZERO_PAGE is a special page that is used for zero-initialized
49 * data and COW.
50 */
51static unsigned long empty_bad_page_table;
52
53static unsigned long empty_bad_page;
54
Graf Yangf82e0a02009-04-08 08:30:22 +000055static unsigned long empty_zero_page;
Bryan Wu1394f032007-05-06 14:50:22 -070056
Graf Yangf82e0a02009-04-08 08:30:22 +000057#ifndef CONFIG_EXCEPTION_L1_SCRATCH
58#if defined CONFIG_SYSCALL_TAB_L1
59__attribute__((l1_data))
60#endif
61static unsigned long exception_stack[NR_CPUS][1024];
62#endif
Graf Yang8f658732008-11-18 17:48:22 +080063
64struct blackfin_pda cpu_pda[NR_CPUS];
65EXPORT_SYMBOL(cpu_pda);
66
Bryan Wu1394f032007-05-06 14:50:22 -070067/*
68 * paging_init() continues the virtual memory environment setup which
69 * was begun by the code in arch/head.S.
70 * The parameters are pointers to where to stick the starting and ending
71 * addresses of available kernel virtual memory.
72 */
Mike Frysinger321f6e02007-06-11 15:31:30 +080073void __init paging_init(void)
Bryan Wu1394f032007-05-06 14:50:22 -070074{
75 /*
76 * make sure start_mem is page aligned, otherwise bootmem and
77 * page_alloc get different views og the world
78 */
79 unsigned long end_mem = memory_end & PAGE_MASK;
80
81 pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
82
83 /*
84 * initialize the bad page table and bad page to point
85 * to a couple of allocated pages
86 */
87 empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
88 empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
89 empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
90 memset((void *)empty_zero_page, 0, PAGE_SIZE);
91
92 /*
93 * Set up SFC/DFC registers (user data space)
94 */
95 set_fs(KERNEL_DS);
96
97 pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
98 PAGE_ALIGN(memory_start), end_mem);
99
100 {
101 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
102
Aubrey Lie3defff2007-05-21 18:09:11 +0800103 zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
104 zones_size[ZONE_NORMAL] = 0;
Bryan Wu1394f032007-05-06 14:50:22 -0700105#ifdef CONFIG_HIGHMEM
106 zones_size[ZONE_HIGHMEM] = 0;
107#endif
108 free_area_init(zones_size);
109 }
110}
111
Mike Frysinger8e2a7692009-03-05 18:45:07 +0800112asmlinkage void __init init_pda(void)
Graf Yang8f658732008-11-18 17:48:22 +0800113{
114 unsigned int cpu = raw_smp_processor_id();
115
116 /* Initialize the PDA fields holding references to other parts
117 of the memory. The content of such memory is still
118 undefined at the time of the call, we are only setting up
119 valid pointers to it. */
120 memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu]));
121
122 cpu_pda[0].next = &cpu_pda[1];
123 cpu_pda[1].next = &cpu_pda[0];
124
Graf Yangf82e0a02009-04-08 08:30:22 +0000125#ifdef CONFIG_EXCEPTION_L1_SCRATCH
126 cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \
127 L1_SCRATCH_LENGTH);
128#else
Graf Yang8f658732008-11-18 17:48:22 +0800129 cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
Graf Yangf82e0a02009-04-08 08:30:22 +0000130#endif
Graf Yang8f658732008-11-18 17:48:22 +0800131
Graf Yang8f658732008-11-18 17:48:22 +0800132#ifdef CONFIG_SMP
133 cpu_pda[cpu].imask = 0x1f;
134#endif
135}
136
Mike Frysinger321f6e02007-06-11 15:31:30 +0800137void __init mem_init(void)
Bryan Wu1394f032007-05-06 14:50:22 -0700138{
139 unsigned int codek = 0, datak = 0, initk = 0;
Yi Liee7883b2008-01-27 19:56:17 +0800140 unsigned int reservedpages = 0, freepages = 0;
Bryan Wu1394f032007-05-06 14:50:22 -0700141 unsigned long tmp;
Bryan Wu1394f032007-05-06 14:50:22 -0700142 unsigned long start_mem = memory_start;
143 unsigned long end_mem = memory_end;
144
145 end_mem &= PAGE_MASK;
146 high_memory = (void *)end_mem;
147
148 start_mem = PAGE_ALIGN(start_mem);
149 max_mapnr = num_physpages = MAP_NR(high_memory);
Yi Li856783b2008-02-09 02:26:01 +0800150 printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
Bryan Wu1394f032007-05-06 14:50:22 -0700151
152 /* This will put all memory onto the freelists. */
153 totalram_pages = free_all_bootmem();
154
Yi Liee7883b2008-01-27 19:56:17 +0800155 reservedpages = 0;
156 for (tmp = 0; tmp < max_mapnr; tmp++)
157 if (PageReserved(pfn_to_page(tmp)))
158 reservedpages++;
159 freepages = max_mapnr - reservedpages;
Bryan Wu1394f032007-05-06 14:50:22 -0700160
Yi Liee7883b2008-01-27 19:56:17 +0800161 /* do not count in kernel image between _rambase and _ramstart */
162 reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
163#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
Yi Li856783b2008-02-09 02:26:01 +0800164 reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
Yi Liee7883b2008-01-27 19:56:17 +0800165#endif
166
167 codek = (_etext - _stext) >> 10;
168 initk = (__init_end - __init_begin) >> 10;
169 datak = ((_ramstart - _rambase) >> 10) - codek - initk;
170
Bryan Wu1394f032007-05-06 14:50:22 -0700171 printk(KERN_INFO
Yi Liee7883b2008-01-27 19:56:17 +0800172 "Memory available: %luk/%luk RAM, "
Yi Li856783b2008-02-09 02:26:01 +0800173 "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
Yi Liee7883b2008-01-27 19:56:17 +0800174 (unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
Yi Li856783b2008-02-09 02:26:01 +0800175 initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
Sonic Zhang5d481f42008-07-19 14:51:31 +0800176}
177
Bryan Wuc0514892008-02-29 12:02:10 +0800178static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
Mike Frysinger1d189472007-07-12 12:32:00 +0800179{
180 unsigned long addr;
181 /* next to check that the page we free is not a partial page */
182 for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) {
183 ClearPageReserved(virt_to_page(addr));
184 init_page_count(virt_to_page(addr));
185 free_page(addr);
186 totalram_pages++;
187 }
188 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
189}
190
Bryan Wu1394f032007-05-06 14:50:22 -0700191#ifdef CONFIG_BLK_DEV_INITRD
Mike Frysinger321f6e02007-06-11 15:31:30 +0800192void __init free_initrd_mem(unsigned long start, unsigned long end)
Bryan Wu1394f032007-05-06 14:50:22 -0700193{
Bernd Schmidtb97b8a92008-01-27 18:39:16 +0800194#ifndef CONFIG_MPU
Mike Frysinger1d189472007-07-12 12:32:00 +0800195 free_init_pages("initrd memory", start, end);
Bernd Schmidtb97b8a92008-01-27 18:39:16 +0800196#endif
Bryan Wu1394f032007-05-06 14:50:22 -0700197}
198#endif
199
Bryan Wuc0514892008-02-29 12:02:10 +0800200void __init_refok free_initmem(void)
Bryan Wu1394f032007-05-06 14:50:22 -0700201{
Bernd Schmidtb97b8a92008-01-27 18:39:16 +0800202#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
Mike Frysinger1d189472007-07-12 12:32:00 +0800203 free_init_pages("unused kernel memory",
204 (unsigned long)(&__init_begin),
205 (unsigned long)(&__init_end));
Bryan Wu1394f032007-05-06 14:50:22 -0700206#endif
207}