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/dma-contiguous.h>
11 #include <linux/memblock.h>
12 #include <linux/init.h>
13 #include <linux/kernel.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>
20 #include <linux/export.h>
23 #include <asm/mmu_context.h>
24 #include <asm/pgalloc.h>
25 #include <asm/sections.h>
27 #include <asm/fixmap.h>
29 /* Use for MMU and noMMU because of PCI generic code */
33 unsigned int __page_offset;
34 EXPORT_SYMBOL(__page_offset);
35 #endif /* CONFIG_MMU */
40 * Initialize the bootmem system and give it all the memory we
43 unsigned long memory_start;
44 EXPORT_SYMBOL(memory_start);
45 unsigned long memory_size;
46 EXPORT_SYMBOL(memory_size);
47 unsigned long lowmem_size;
51 EXPORT_SYMBOL(kmap_pte);
53 static void __init highmem_init(void)
55 pr_debug("%x\n", (u32)PKMAP_BASE);
56 map_page(PKMAP_BASE, 0, 0); /* XXX gross */
57 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
59 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
62 static void highmem_setup(void)
66 for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
67 struct page *page = pfn_to_page(pfn);
69 /* FIXME not sure about */
70 if (!memblock_is_reserved(pfn << PAGE_SHIFT))
71 free_highmem_page(page);
74 #endif /* CONFIG_HIGHMEM */
77 * paging_init() sets up the page tables - in fact we've already done this.
79 static void __init paging_init(void)
81 unsigned long zones_size[MAX_NR_ZONES];
86 for (idx = 0; idx < __end_of_fixed_addresses; idx++)
90 /* Clean every zones */
91 memset(zones_size, 0, sizeof(zones_size));
96 zones_size[ZONE_DMA] = max_low_pfn;
97 zones_size[ZONE_HIGHMEM] = max_pfn;
99 zones_size[ZONE_DMA] = max_pfn;
102 /* We don't have holes in memory map */
103 free_area_init(zones_size);
106 void __init setup_memory(void)
108 struct memblock_region *reg;
111 u32 kernel_align_start, kernel_align_size;
113 /* Find main memory where is the kernel */
114 for_each_memblock(memory, reg) {
115 memory_start = (u32)reg->base;
116 lowmem_size = reg->size;
117 if ((memory_start <= (u32)_text) &&
118 ((u32)_text <= (memory_start + lowmem_size - 1))) {
119 memory_size = lowmem_size;
120 PAGE_OFFSET = memory_start;
121 pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
122 __func__, (u32) memory_start,
128 if (!memory_start || !memory_size) {
129 panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
130 __func__, (u32) memory_start, (u32) memory_size);
133 /* reservation of region where is the kernel */
134 kernel_align_start = PAGE_DOWN((u32)_text);
135 /* ALIGN can be remove because _end in vmlinux.lds.S is align */
136 kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
137 pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
138 __func__, kernel_align_start, kernel_align_start
139 + kernel_align_size, kernel_align_size);
140 memblock_reserve(kernel_align_start, kernel_align_size);
144 * start: base phys address of kernel - page align
145 * end: base phys address of kernel - page align
147 * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
149 * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
152 /* memory start is from the kernel end (aligned) to higher addr */
153 min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
154 /* RAM is assumed contiguous */
155 max_mapnr = memory_size >> PAGE_SHIFT;
156 max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
157 max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
159 pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
160 pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
161 pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
162 pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
164 /* Add active regions with valid PFNs */
165 for_each_memblock(memory, reg) {
166 unsigned long start_pfn, end_pfn;
168 start_pfn = memblock_region_memory_base_pfn(reg);
169 end_pfn = memblock_region_memory_end_pfn(reg);
170 memblock_set_node(start_pfn << PAGE_SHIFT,
171 (end_pfn - start_pfn) << PAGE_SHIFT,
172 &memblock.memory, 0);
175 /* XXX need to clip this if using highmem? */
176 sparse_memory_present_with_active_regions(0);
181 void __init mem_init(void)
183 high_memory = (void *)__va(memory_start + lowmem_size - 1);
185 /* this will put all memory onto the freelists */
187 #ifdef CONFIG_HIGHMEM
191 mem_init_print_info(NULL);
196 int page_is_ram(unsigned long pfn)
198 return __range_ok(pfn, 0);
201 int page_is_ram(unsigned long pfn)
203 return pfn < max_low_pfn;
207 * Check for command-line options that affect what MMU_init will do.
209 static void mm_cmdline_setup(void)
211 unsigned long maxmem = 0;
214 /* Look for mem= option on command line */
215 p = strstr(cmd_line, "mem=");
218 maxmem = memparse(p, &p);
219 if (maxmem && memory_size > maxmem) {
220 memory_size = maxmem;
221 memblock.memory.regions[0].size = memory_size;
227 * MMU_init_hw does the chip-specific initialization of the MMU hardware.
229 static void __init mmu_init_hw(void)
232 * The Zone Protection Register (ZPR) defines how protection will
233 * be applied to every page which is a member of a given zone. At
234 * present, we utilize only two of the zones.
235 * The zone index bits (of ZSEL) in the PTE are used for software
236 * indicators, except the LSB. For user access, zone 1 is used,
237 * for kernel access, zone 0 is used. We set all but zone 1
238 * to zero, allowing only kernel access as indicated in the PTE.
239 * For zone 1, we set a 01 binary (a value of 10 will not work)
240 * to allow user access as indicated in the PTE. This also allows
241 * kernel access as indicated in the PTE.
243 __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
249 * MMU_init sets up the basic memory mappings for the kernel,
250 * including both RAM and possibly some I/O regions,
251 * and sets up the page tables and the MMU hardware ready to go.
254 /* called from head.S */
255 asmlinkage void __init mmu_init(void)
257 unsigned int kstart, ksize;
259 if (!memblock.reserved.cnt) {
260 pr_emerg("Error memory count\n");
261 machine_restart(NULL);
264 if ((u32) memblock.memory.regions[0].size < 0x400000) {
265 pr_emerg("Memory must be greater than 4MB\n");
266 machine_restart(NULL);
269 if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
270 pr_emerg("Kernel size is greater than memory node\n");
271 machine_restart(NULL);
274 /* Find main memory where the kernel is */
275 memory_start = (u32) memblock.memory.regions[0].base;
276 lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
278 if (lowmem_size > CONFIG_LOWMEM_SIZE) {
279 lowmem_size = CONFIG_LOWMEM_SIZE;
280 #ifndef CONFIG_HIGHMEM
281 memory_size = lowmem_size;
285 mm_cmdline_setup(); /* FIXME parse args from command line - not used */
288 * Map out the kernel text/data/bss from the available physical
291 kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
293 ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
294 memblock_reserve(kstart, ksize);
296 #if defined(CONFIG_BLK_DEV_INITRD)
297 /* Remove the init RAM disk from the available memory. */
300 size = initrd_end - initrd_start;
301 memblock_reserve(__virt_to_phys(initrd_start), size);
303 #endif /* CONFIG_BLK_DEV_INITRD */
305 /* Initialize the MMU hardware */
308 /* Map in all of RAM starting at CONFIG_KERNEL_START */
311 /* Extend vmalloc and ioremap area as big as possible */
312 #ifdef CONFIG_HIGHMEM
313 ioremap_base = ioremap_bot = PKMAP_BASE;
315 ioremap_base = ioremap_bot = FIXADDR_START;
318 /* Initialize the context management stuff */
321 /* Shortly after that, the entire linear mapping will be available */
322 /* This will also cause that unflatten device tree will be allocated
323 * inside 768MB limit */
324 memblock_set_current_limit(memory_start + lowmem_size - 1);
328 /* CMA initialization */
329 dma_contiguous_reserve(memory_start + lowmem_size - 1);
332 /* This is only called until mem_init is done. */
333 void __init *early_get_page(void)
336 * Mem start + kernel_tlb -> here is limit
337 * because of mem mapping from head.S
339 return memblock_alloc_try_nid_raw(PAGE_SIZE, PAGE_SIZE,
340 MEMBLOCK_LOW_LIMIT, memory_start + kernel_tlb,
344 #endif /* CONFIG_MMU */
346 void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
351 p = kzalloc(size, mask);
353 p = memblock_alloc(size, SMP_CACHE_BYTES);
355 panic("%s: Failed to allocate %zu bytes\n",