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1394f032 BW |
1 | /* |
2 | * File: arch/blackfin/mm/init.c | |
3 | * Based on: | |
4 | * Author: | |
5 | * | |
6 | * Created: | |
7 | * Description: | |
8 | * | |
9 | * Modified: | |
321f6e0f | 10 | * Copyright 2004-2007 Analog Devices Inc. |
1394f032 BW |
11 | * |
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> | |
1f83b8f1 | 32 | #include <linux/uaccess.h> |
1394f032 | 33 | #include <asm/bfin-global.h> |
1394f032 BW |
34 | #include <asm/l1layout.h> |
35 | #include "blackfin_sram.h" | |
36 | ||
37 | /* | |
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 | |
42 | * unused etc.. | |
43 | * | |
44 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
45 | * to point to BAD_PAGE entries. | |
46 | * | |
47 | * ZERO_PAGE is a special page that is used for zero-initialized | |
48 | * data and COW. | |
49 | */ | |
50 | static unsigned long empty_bad_page_table; | |
51 | ||
52 | static unsigned long empty_bad_page; | |
53 | ||
54 | unsigned long empty_zero_page; | |
55 | ||
1394f032 BW |
56 | /* |
57 | * paging_init() continues the virtual memory environment setup which | |
58 | * was begun by the code in arch/head.S. | |
59 | * The parameters are pointers to where to stick the starting and ending | |
60 | * addresses of available kernel virtual memory. | |
61 | */ | |
321f6e0f | 62 | void __init paging_init(void) |
1394f032 BW |
63 | { |
64 | /* | |
65 | * make sure start_mem is page aligned, otherwise bootmem and | |
66 | * page_alloc get different views og the world | |
67 | */ | |
68 | unsigned long end_mem = memory_end & PAGE_MASK; | |
69 | ||
70 | pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem); | |
71 | ||
72 | /* | |
73 | * initialize the bad page table and bad page to point | |
74 | * to a couple of allocated pages | |
75 | */ | |
76 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
77 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
78 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
79 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
80 | ||
81 | /* | |
82 | * Set up SFC/DFC registers (user data space) | |
83 | */ | |
84 | set_fs(KERNEL_DS); | |
85 | ||
86 | pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n", | |
87 | PAGE_ALIGN(memory_start), end_mem); | |
88 | ||
89 | { | |
90 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
91 | ||
e3defffe AL |
92 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
93 | zones_size[ZONE_NORMAL] = 0; | |
1394f032 BW |
94 | #ifdef CONFIG_HIGHMEM |
95 | zones_size[ZONE_HIGHMEM] = 0; | |
96 | #endif | |
97 | free_area_init(zones_size); | |
98 | } | |
99 | } | |
100 | ||
321f6e0f | 101 | void __init mem_init(void) |
1394f032 BW |
102 | { |
103 | unsigned int codek = 0, datak = 0, initk = 0; | |
ee7883b7 | 104 | unsigned int reservedpages = 0, freepages = 0; |
1394f032 | 105 | unsigned long tmp; |
1394f032 BW |
106 | unsigned long start_mem = memory_start; |
107 | unsigned long end_mem = memory_end; | |
108 | ||
109 | end_mem &= PAGE_MASK; | |
110 | high_memory = (void *)end_mem; | |
111 | ||
112 | start_mem = PAGE_ALIGN(start_mem); | |
113 | max_mapnr = num_physpages = MAP_NR(high_memory); | |
856783b3 | 114 | printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages); |
1394f032 BW |
115 | |
116 | /* This will put all memory onto the freelists. */ | |
117 | totalram_pages = free_all_bootmem(); | |
118 | ||
ee7883b7 YL |
119 | reservedpages = 0; |
120 | for (tmp = 0; tmp < max_mapnr; tmp++) | |
121 | if (PageReserved(pfn_to_page(tmp))) | |
122 | reservedpages++; | |
123 | freepages = max_mapnr - reservedpages; | |
124 | ||
125 | /* do not count in kernel image between _rambase and _ramstart */ | |
126 | reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT; | |
127 | #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263) | |
856783b3 | 128 | reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT; |
ee7883b7 YL |
129 | #endif |
130 | ||
1394f032 | 131 | codek = (_etext - _stext) >> 10; |
1394f032 | 132 | initk = (__init_end - __init_begin) >> 10; |
ee7883b7 | 133 | datak = ((_ramstart - _rambase) >> 10) - codek - initk; |
1394f032 | 134 | |
1394f032 | 135 | printk(KERN_INFO |
ee7883b7 | 136 | "Memory available: %luk/%luk RAM, " |
856783b3 | 137 | "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n", |
ee7883b7 | 138 | (unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10, |
856783b3 | 139 | initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10))); |
5d481f49 SZ |
140 | } |
141 | ||
142 | static int __init sram_init(void) | |
143 | { | |
144 | unsigned long tmp; | |
1394f032 BW |
145 | |
146 | /* Initialize the blackfin L1 Memory. */ | |
5d481f49 | 147 | bfin_sram_init(); |
1394f032 BW |
148 | |
149 | /* Allocate this once; never free it. We assume this gives us a | |
150 | pointer to the start of L1 scratchpad memory; panic if it | |
151 | doesn't. */ | |
152 | tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info)); | |
153 | if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) { | |
154 | printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n", | |
155 | tmp, (unsigned long)L1_SCRATCH_TASK_INFO); | |
156 | panic("No L1, time to give up\n"); | |
157 | } | |
5d481f49 SZ |
158 | |
159 | return 0; | |
1394f032 | 160 | } |
5d481f49 | 161 | pure_initcall(sram_init); |
1394f032 | 162 | |
c051489d | 163 | static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end) |
1394f032 | 164 | { |
1d189474 MF |
165 | unsigned long addr; |
166 | /* next to check that the page we free is not a partial page */ | |
167 | for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) { | |
168 | ClearPageReserved(virt_to_page(addr)); | |
169 | init_page_count(virt_to_page(addr)); | |
170 | free_page(addr); | |
1394f032 | 171 | totalram_pages++; |
1394f032 | 172 | } |
1d189474 MF |
173 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
174 | } | |
175 | ||
176 | #ifdef CONFIG_BLK_DEV_INITRD | |
177 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
178 | { | |
b97b8a99 | 179 | #ifndef CONFIG_MPU |
1d189474 | 180 | free_init_pages("initrd memory", start, end); |
b97b8a99 | 181 | #endif |
1394f032 BW |
182 | } |
183 | #endif | |
184 | ||
c051489d | 185 | void __init_refok free_initmem(void) |
1394f032 | 186 | { |
b97b8a99 | 187 | #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU |
1d189474 MF |
188 | free_init_pages("unused kernel memory", |
189 | (unsigned long)(&__init_begin), | |
190 | (unsigned long)(&__init_end)); | |
1394f032 BW |
191 | #endif |
192 | } |