2 * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
3 * Copyright (C) 2006 Atmark Techno, Inc.
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
10 #include <linux/bootmem.h>
11 #include <linux/init.h>
12 #include <linux/kernel.h>
13 #include <linux/lmb.h>
14 #include <linux/mm.h> /* mem_init */
15 #include <linux/initrd.h>
16 #include <linux/pagemap.h>
17 #include <linux/pfn.h>
18 #include <linux/slab.h>
19 #include <linux/swap.h>
22 #include <asm/mmu_context.h>
23 #include <asm/pgalloc.h>
24 #include <asm/sections.h>
27 /* Use for MMU and noMMU because of PCI generic code */
31 unsigned int __page_offset;
32 EXPORT_SYMBOL(__page_offset);
35 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
37 static int init_bootmem_done;
38 #endif /* CONFIG_MMU */
43 * Initialize the bootmem system and give it all the memory we
46 unsigned long memory_start;
47 EXPORT_SYMBOL(memory_start);
48 unsigned long memory_end; /* due to mm/nommu.c */
49 unsigned long memory_size;
52 * paging_init() sets up the page tables - in fact we've already done this.
54 static void __init paging_init(void)
56 unsigned long zones_size[MAX_NR_ZONES];
58 /* Clean every zones */
59 memset(zones_size, 0, sizeof(zones_size));
62 * old: we can DMA to/from any address.put all page into ZONE_DMA
63 * We use only ZONE_NORMAL
65 zones_size[ZONE_NORMAL] = max_mapnr;
67 free_area_init(zones_size);
70 void __init setup_memory(void)
73 unsigned long map_size;
75 u32 kernel_align_start, kernel_align_size;
77 /* Find main memory where is the kernel */
78 for (i = 0; i < lmb.memory.cnt; i++) {
79 memory_start = (u32) lmb.memory.region[i].base;
80 memory_end = (u32) lmb.memory.region[i].base
81 + (u32) lmb.memory.region[i].size;
82 if ((memory_start <= (u32)_text) &&
83 ((u32)_text <= memory_end)) {
84 memory_size = memory_end - memory_start;
85 PAGE_OFFSET = memory_start;
86 printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
87 "size 0x%08x\n", __func__, (u32) memory_start,
88 (u32) memory_end, (u32) memory_size);
93 if (!memory_start || !memory_end) {
94 panic("%s: Missing memory setting 0x%08x-0x%08x\n",
95 __func__, (u32) memory_start, (u32) memory_end);
98 /* reservation of region where is the kernel */
99 kernel_align_start = PAGE_DOWN((u32)_text);
100 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
101 kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
102 lmb_reserve(kernel_align_start, kernel_align_size);
103 printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
104 __func__, kernel_align_start, kernel_align_start
105 + kernel_align_size, kernel_align_size);
110 * start: base phys address of kernel - page align
111 * end: base phys address of kernel - page align
113 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
115 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
116 * num_physpages - number of all pages
119 /* memory start is from the kernel end (aligned) to higher addr */
120 min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
121 /* RAM is assumed contiguous */
122 num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
123 max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
125 printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
126 printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
127 printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
130 * Find an area to use for the bootmem bitmap.
131 * We look for the first area which is at least
132 * 128kB in length (128kB is enough for a bitmap
133 * for 4GB of memory, using 4kB pages), plus 1 page
134 * (in case the address isn't page-aligned).
137 map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)klimit)),
138 min_low_pfn, max_low_pfn);
140 map_size = init_bootmem_node(&contig_page_data,
141 PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
143 lmb_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
145 /* free bootmem is whole main memory */
146 free_bootmem(memory_start, memory_size);
148 /* reserve allocate blocks */
149 for (i = 0; i < lmb.reserved.cnt; i++) {
150 pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
151 (u32) lmb.reserved.region[i].base,
152 (u32) lmb_size_bytes(&lmb.reserved, i));
153 reserve_bootmem(lmb.reserved.region[i].base,
154 lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
157 init_bootmem_done = 1;
162 void free_init_pages(char *what, unsigned long begin, unsigned long end)
166 for (addr = begin; addr < end; addr += PAGE_SIZE) {
167 ClearPageReserved(virt_to_page(addr));
168 init_page_count(virt_to_page(addr));
172 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
175 #ifdef CONFIG_BLK_DEV_INITRD
176 void free_initrd_mem(unsigned long start, unsigned long end)
179 for (; start < end; start += PAGE_SIZE) {
180 ClearPageReserved(virt_to_page(start));
181 init_page_count(virt_to_page(start));
186 printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n",
187 (int)(pages * (PAGE_SIZE / 1024)));
191 void free_initmem(void)
193 free_init_pages("unused kernel memory",
194 (unsigned long)(&__init_begin),
195 (unsigned long)(&__init_end));
198 void __init mem_init(void)
200 high_memory = (void *)__va(memory_end);
201 /* this will put all memory onto the freelists */
202 totalram_pages += free_all_bootmem();
204 printk(KERN_INFO "Memory: %luk/%luk available\n",
205 nr_free_pages() << (PAGE_SHIFT-10),
206 num_physpages << (PAGE_SHIFT-10));
211 int page_is_ram(unsigned long pfn)
213 return __range_ok(pfn, 0);
216 int page_is_ram(unsigned long pfn)
218 return pfn < max_low_pfn;
222 * Check for command-line options that affect what MMU_init will do.
224 static void mm_cmdline_setup(void)
226 unsigned long maxmem = 0;
229 /* Look for mem= option on command line */
230 p = strstr(cmd_line, "mem=");
233 maxmem = memparse(p, &p);
234 if (maxmem && memory_size > maxmem) {
235 memory_size = maxmem;
236 memory_end = memory_start + memory_size;
237 lmb.memory.region[0].size = memory_size;
243 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
245 static void __init mmu_init_hw(void)
248 * The Zone Protection Register (ZPR) defines how protection will
249 * be applied to every page which is a member of a given zone. At
250 * present, we utilize only two of the zones.
251 * The zone index bits (of ZSEL) in the PTE are used for software
252 * indicators, except the LSB. For user access, zone 1 is used,
253 * for kernel access, zone 0 is used. We set all but zone 1
254 * to zero, allowing only kernel access as indicated in the PTE.
255 * For zone 1, we set a 01 binary (a value of 10 will not work)
256 * to allow user access as indicated in the PTE. This also allows
257 * kernel access as indicated in the PTE.
259 __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
265 * MMU_init sets up the basic memory mappings for the kernel,
266 * including both RAM and possibly some I/O regions,
267 * and sets up the page tables and the MMU hardware ready to go.
270 /* called from head.S */
271 asmlinkage void __init mmu_init(void)
273 unsigned int kstart, ksize;
275 if (!lmb.reserved.cnt) {
276 printk(KERN_EMERG "Error memory count\n");
277 machine_restart(NULL);
280 if ((u32) lmb.memory.region[0].size < 0x1000000) {
281 printk(KERN_EMERG "Memory must be greater than 16MB\n");
282 machine_restart(NULL);
284 /* Find main memory where the kernel is */
285 memory_start = (u32) lmb.memory.region[0].base;
286 memory_end = (u32) lmb.memory.region[0].base +
287 (u32) lmb.memory.region[0].size;
288 memory_size = memory_end - memory_start;
290 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
293 * Map out the kernel text/data/bss from the available physical
296 kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
298 ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
299 lmb_reserve(kstart, ksize);
301 #if defined(CONFIG_BLK_DEV_INITRD)
302 /* Remove the init RAM disk from the available memory. */
303 /* if (initrd_start) {
304 mem_pieces_remove(&phys_avail, __pa(initrd_start),
305 initrd_end - initrd_start, 1);
307 #endif /* CONFIG_BLK_DEV_INITRD */
309 /* Initialize the MMU hardware */
312 /* Map in all of RAM starting at CONFIG_KERNEL_START */
315 #ifdef HIGHMEM_START_BOOL
316 ioremap_base = HIGHMEM_START;
318 ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
319 #endif /* CONFIG_HIGHMEM */
320 ioremap_bot = ioremap_base;
322 /* Initialize the context management stuff */
326 /* This is only called until mem_init is done. */
327 void __init *early_get_page(void)
330 if (init_bootmem_done) {
331 p = alloc_bootmem_pages(PAGE_SIZE);
334 * Mem start + 32MB -> here is limit
335 * because of mem mapping from head.S
337 p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
338 memory_start + 0x2000000));
343 #endif /* CONFIG_MMU */
345 void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
348 return kmalloc(size, mask);
350 return alloc_bootmem(size);
353 void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
358 p = kzalloc(size, mask);
360 p = alloc_bootmem(size);