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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> |
8f65873e GY |
34 | #include <asm/pda.h> |
35 | #include <asm/cplbinit.h> | |
837ec2d5 | 36 | #include <asm/early_printk.h> |
1394f032 BW |
37 | #include "blackfin_sram.h" |
38 | ||
39 | /* | |
40 | * BAD_PAGE is the page that is used for page faults when linux | |
41 | * is out-of-memory. Older versions of linux just did a | |
42 | * do_exit(), but using this instead means there is less risk | |
43 | * for a process dying in kernel mode, possibly leaving a inode | |
44 | * unused etc.. | |
45 | * | |
46 | * BAD_PAGETABLE is the accompanying page-table: it is initialized | |
47 | * to point to BAD_PAGE entries. | |
48 | * | |
49 | * ZERO_PAGE is a special page that is used for zero-initialized | |
50 | * data and COW. | |
51 | */ | |
52 | static unsigned long empty_bad_page_table; | |
53 | ||
54 | static unsigned long empty_bad_page; | |
55 | ||
f82e0a0c | 56 | static unsigned long empty_zero_page; |
1394f032 | 57 | |
f82e0a0c GY |
58 | #ifndef CONFIG_EXCEPTION_L1_SCRATCH |
59 | #if defined CONFIG_SYSCALL_TAB_L1 | |
60 | __attribute__((l1_data)) | |
61 | #endif | |
62 | static unsigned long exception_stack[NR_CPUS][1024]; | |
63 | #endif | |
8f65873e GY |
64 | |
65 | struct blackfin_pda cpu_pda[NR_CPUS]; | |
66 | EXPORT_SYMBOL(cpu_pda); | |
67 | ||
1394f032 BW |
68 | /* |
69 | * paging_init() continues the virtual memory environment setup which | |
70 | * was begun by the code in arch/head.S. | |
71 | * The parameters are pointers to where to stick the starting and ending | |
72 | * addresses of available kernel virtual memory. | |
73 | */ | |
321f6e0f | 74 | void __init paging_init(void) |
1394f032 BW |
75 | { |
76 | /* | |
77 | * make sure start_mem is page aligned, otherwise bootmem and | |
78 | * page_alloc get different views og the world | |
79 | */ | |
80 | unsigned long end_mem = memory_end & PAGE_MASK; | |
81 | ||
82 | pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem); | |
83 | ||
84 | /* | |
85 | * initialize the bad page table and bad page to point | |
86 | * to a couple of allocated pages | |
87 | */ | |
88 | empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
89 | empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
90 | empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE); | |
91 | memset((void *)empty_zero_page, 0, PAGE_SIZE); | |
92 | ||
93 | /* | |
94 | * Set up SFC/DFC registers (user data space) | |
95 | */ | |
96 | set_fs(KERNEL_DS); | |
97 | ||
98 | pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n", | |
99 | PAGE_ALIGN(memory_start), end_mem); | |
100 | ||
101 | { | |
102 | unsigned long zones_size[MAX_NR_ZONES] = { 0, }; | |
103 | ||
e3defffe AL |
104 | zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
105 | zones_size[ZONE_NORMAL] = 0; | |
1394f032 BW |
106 | #ifdef CONFIG_HIGHMEM |
107 | zones_size[ZONE_HIGHMEM] = 0; | |
108 | #endif | |
109 | free_area_init(zones_size); | |
110 | } | |
111 | } | |
112 | ||
8e2a7694 | 113 | asmlinkage void __init init_pda(void) |
8f65873e GY |
114 | { |
115 | unsigned int cpu = raw_smp_processor_id(); | |
116 | ||
837ec2d5 RG |
117 | early_shadow_stamp(); |
118 | ||
8f65873e GY |
119 | /* Initialize the PDA fields holding references to other parts |
120 | of the memory. The content of such memory is still | |
121 | undefined at the time of the call, we are only setting up | |
122 | valid pointers to it. */ | |
123 | memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu])); | |
124 | ||
125 | cpu_pda[0].next = &cpu_pda[1]; | |
126 | cpu_pda[1].next = &cpu_pda[0]; | |
127 | ||
f82e0a0c GY |
128 | #ifdef CONFIG_EXCEPTION_L1_SCRATCH |
129 | cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \ | |
130 | L1_SCRATCH_LENGTH); | |
131 | #else | |
8f65873e | 132 | cpu_pda[cpu].ex_stack = exception_stack[cpu + 1]; |
f82e0a0c | 133 | #endif |
8f65873e | 134 | |
8f65873e GY |
135 | #ifdef CONFIG_SMP |
136 | cpu_pda[cpu].imask = 0x1f; | |
137 | #endif | |
138 | } | |
139 | ||
321f6e0f | 140 | void __init mem_init(void) |
1394f032 BW |
141 | { |
142 | unsigned int codek = 0, datak = 0, initk = 0; | |
ee7883b7 | 143 | unsigned int reservedpages = 0, freepages = 0; |
1394f032 | 144 | unsigned long tmp; |
1394f032 BW |
145 | unsigned long start_mem = memory_start; |
146 | unsigned long end_mem = memory_end; | |
147 | ||
148 | end_mem &= PAGE_MASK; | |
149 | high_memory = (void *)end_mem; | |
150 | ||
151 | start_mem = PAGE_ALIGN(start_mem); | |
152 | max_mapnr = num_physpages = MAP_NR(high_memory); | |
856783b3 | 153 | printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages); |
1394f032 BW |
154 | |
155 | /* This will put all memory onto the freelists. */ | |
156 | totalram_pages = free_all_bootmem(); | |
157 | ||
ee7883b7 YL |
158 | reservedpages = 0; |
159 | for (tmp = 0; tmp < max_mapnr; tmp++) | |
160 | if (PageReserved(pfn_to_page(tmp))) | |
161 | reservedpages++; | |
162 | freepages = max_mapnr - reservedpages; | |
163 | ||
164 | /* do not count in kernel image between _rambase and _ramstart */ | |
165 | reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT; | |
41ba653f | 166 | #if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263) |
856783b3 | 167 | reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT; |
ee7883b7 YL |
168 | #endif |
169 | ||
1394f032 | 170 | codek = (_etext - _stext) >> 10; |
1394f032 | 171 | initk = (__init_end - __init_begin) >> 10; |
ee7883b7 | 172 | datak = ((_ramstart - _rambase) >> 10) - codek - initk; |
1394f032 | 173 | |
1394f032 | 174 | printk(KERN_INFO |
ee7883b7 | 175 | "Memory available: %luk/%luk RAM, " |
856783b3 | 176 | "(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n", |
ee7883b7 | 177 | (unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10, |
856783b3 | 178 | initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10))); |
5d481f49 SZ |
179 | } |
180 | ||
c051489d | 181 | static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end) |
1394f032 | 182 | { |
1d189474 MF |
183 | unsigned long addr; |
184 | /* next to check that the page we free is not a partial page */ | |
185 | for (addr = begin; addr + PAGE_SIZE <= end; addr += PAGE_SIZE) { | |
186 | ClearPageReserved(virt_to_page(addr)); | |
187 | init_page_count(virt_to_page(addr)); | |
188 | free_page(addr); | |
1394f032 | 189 | totalram_pages++; |
1394f032 | 190 | } |
1d189474 MF |
191 | printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10); |
192 | } | |
193 | ||
194 | #ifdef CONFIG_BLK_DEV_INITRD | |
195 | void __init free_initrd_mem(unsigned long start, unsigned long end) | |
196 | { | |
b97b8a99 | 197 | #ifndef CONFIG_MPU |
1d189474 | 198 | free_init_pages("initrd memory", start, end); |
b97b8a99 | 199 | #endif |
1394f032 BW |
200 | } |
201 | #endif | |
202 | ||
c051489d | 203 | void __init_refok free_initmem(void) |
1394f032 | 204 | { |
b97b8a99 | 205 | #if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU |
1d189474 MF |
206 | free_init_pages("unused kernel memory", |
207 | (unsigned long)(&__init_begin), | |
208 | (unsigned long)(&__init_end)); | |
1394f032 BW |
209 | #endif |
210 | } |