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Linux/arch/microblaze/mm/init.c

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  1 /*
  2  * Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
  3  * Copyright (C) 2006 Atmark Techno, Inc.
  4  *
  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
  7  * for more details.
  8  */
  9 
 10 #include <linux/bootmem.h>
 11 #include <linux/init.h>
 12 #include <linux/kernel.h>
 13 #include <linux/memblock.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>
 21 
 22 #include <asm/page.h>
 23 #include <asm/mmu_context.h>
 24 #include <asm/pgalloc.h>
 25 #include <asm/sections.h>
 26 #include <asm/tlb.h>
 27 #include <asm/fixmap.h>
 28 
 29 /* Use for MMU and noMMU because of PCI generic code */
 30 int mem_init_done;
 31 
 32 #ifndef CONFIG_MMU
 33 unsigned int __page_offset;
 34 EXPORT_SYMBOL(__page_offset);
 35 
 36 #else
 37 static int init_bootmem_done;
 38 #endif /* CONFIG_MMU */
 39 
 40 char *klimit = _end;
 41 
 42 /*
 43  * Initialize the bootmem system and give it all the memory we
 44  * have available.
 45  */
 46 unsigned long memory_start;
 47 EXPORT_SYMBOL(memory_start);
 48 unsigned long memory_size;
 49 EXPORT_SYMBOL(memory_size);
 50 unsigned long lowmem_size;
 51 
 52 #ifdef CONFIG_HIGHMEM
 53 pte_t *kmap_pte;
 54 EXPORT_SYMBOL(kmap_pte);
 55 pgprot_t kmap_prot;
 56 EXPORT_SYMBOL(kmap_prot);
 57 
 58 static inline pte_t *virt_to_kpte(unsigned long vaddr)
 59 {
 60         return pte_offset_kernel(pmd_offset(pgd_offset_k(vaddr),
 61                         vaddr), vaddr);
 62 }
 63 
 64 static void __init highmem_init(void)
 65 {
 66         pr_debug("%x\n", (u32)PKMAP_BASE);
 67         map_page(PKMAP_BASE, 0, 0);     /* XXX gross */
 68         pkmap_page_table = virt_to_kpte(PKMAP_BASE);
 69 
 70         kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
 71         kmap_prot = PAGE_KERNEL;
 72 }
 73 
 74 static void highmem_setup(void)
 75 {
 76         unsigned long pfn;
 77 
 78         for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
 79                 struct page *page = pfn_to_page(pfn);
 80 
 81                 /* FIXME not sure about */
 82                 if (!memblock_is_reserved(pfn << PAGE_SHIFT))
 83                         free_highmem_page(page);
 84         }
 85 }
 86 #endif /* CONFIG_HIGHMEM */
 87 
 88 /*
 89  * paging_init() sets up the page tables - in fact we've already done this.
 90  */
 91 static void __init paging_init(void)
 92 {
 93         unsigned long zones_size[MAX_NR_ZONES];
 94 #ifdef CONFIG_MMU
 95         int idx;
 96 
 97         /* Setup fixmaps */
 98         for (idx = 0; idx < __end_of_fixed_addresses; idx++)
 99                 clear_fixmap(idx);
100 #endif
101 
102         /* Clean every zones */
103         memset(zones_size, 0, sizeof(zones_size));
104 
105 #ifdef CONFIG_HIGHMEM
106         highmem_init();
107 
108         zones_size[ZONE_DMA] = max_low_pfn;
109         zones_size[ZONE_HIGHMEM] = max_pfn;
110 #else
111         zones_size[ZONE_DMA] = max_pfn;
112 #endif
113 
114         /* We don't have holes in memory map */
115         free_area_init_nodes(zones_size);
116 }
117 
118 void __init setup_memory(void)
119 {
120         unsigned long map_size;
121         struct memblock_region *reg;
122 
123 #ifndef CONFIG_MMU
124         u32 kernel_align_start, kernel_align_size;
125 
126         /* Find main memory where is the kernel */
127         for_each_memblock(memory, reg) {
128                 memory_start = (u32)reg->base;
129                 lowmem_size = reg->size;
130                 if ((memory_start <= (u32)_text) &&
131                         ((u32)_text <= (memory_start + lowmem_size - 1))) {
132                         memory_size = lowmem_size;
133                         PAGE_OFFSET = memory_start;
134                         pr_info("%s: Main mem: 0x%x, size 0x%08x\n",
135                                 __func__, (u32) memory_start,
136                                         (u32) memory_size);
137                         break;
138                 }
139         }
140 
141         if (!memory_start || !memory_size) {
142                 panic("%s: Missing memory setting 0x%08x, size=0x%08x\n",
143                         __func__, (u32) memory_start, (u32) memory_size);
144         }
145 
146         /* reservation of region where is the kernel */
147         kernel_align_start = PAGE_DOWN((u32)_text);
148         /* ALIGN can be remove because _end in vmlinux.lds.S is align */
149         kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
150         pr_info("%s: kernel addr:0x%08x-0x%08x size=0x%08x\n",
151                 __func__, kernel_align_start, kernel_align_start
152                         + kernel_align_size, kernel_align_size);
153         memblock_reserve(kernel_align_start, kernel_align_size);
154 #endif
155         /*
156          * Kernel:
157          * start: base phys address of kernel - page align
158          * end: base phys address of kernel - page align
159          *
160          * min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
161          * max_low_pfn
162          * max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
163          */
164 
165         /* memory start is from the kernel end (aligned) to higher addr */
166         min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
167         /* RAM is assumed contiguous */
168         max_mapnr = memory_size >> PAGE_SHIFT;
169         max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
170         max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
171 
172         pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
173         pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
174         pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
175         pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
176 
177         /*
178          * Find an area to use for the bootmem bitmap.
179          * We look for the first area which is at least
180          * 128kB in length (128kB is enough for a bitmap
181          * for 4GB of memory, using 4kB pages), plus 1 page
182          * (in case the address isn't page-aligned).
183          */
184         map_size = init_bootmem_node(NODE_DATA(0),
185                 PFN_UP(TOPHYS((u32)klimit)), min_low_pfn, max_low_pfn);
186         memblock_reserve(PFN_UP(TOPHYS((u32)klimit)) << PAGE_SHIFT, map_size);
187 
188         /* Add active regions with valid PFNs */
189         for_each_memblock(memory, reg) {
190                 unsigned long start_pfn, end_pfn;
191 
192                 start_pfn = memblock_region_memory_base_pfn(reg);
193                 end_pfn = memblock_region_memory_end_pfn(reg);
194                 memblock_set_node(start_pfn << PAGE_SHIFT,
195                                         (end_pfn - start_pfn) << PAGE_SHIFT, 0);
196         }
197 
198         /* free bootmem is whole main memory */
199         free_bootmem_with_active_regions(0, max_low_pfn);
200 
201         /* reserve allocate blocks */
202         for_each_memblock(reserved, reg) {
203                 unsigned long top = reg->base + reg->size - 1;
204 
205                 pr_debug("reserved - 0x%08x-0x%08x, %lx, %lx\n",
206                          (u32) reg->base, (u32) reg->size, top,
207                                                 memory_start + lowmem_size - 1);
208 
209                 if (top <= (memory_start + lowmem_size - 1)) {
210                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
211                 } else if (reg->base < (memory_start + lowmem_size - 1)) {
212                         unsigned long trunc_size = memory_start + lowmem_size -
213                                                                 reg->base;
214                         reserve_bootmem(reg->base, trunc_size, BOOTMEM_DEFAULT);
215                 }
216         }
217 
218         /* XXX need to clip this if using highmem? */
219         sparse_memory_present_with_active_regions(0);
220 
221 #ifdef CONFIG_MMU
222         init_bootmem_done = 1;
223 #endif
224         paging_init();
225 }
226 
227 #ifdef CONFIG_BLK_DEV_INITRD
228 void free_initrd_mem(unsigned long start, unsigned long end)
229 {
230         free_reserved_area((void *)start, (void *)end, -1, "initrd");
231 }
232 #endif
233 
234 void free_initmem(void)
235 {
236         free_initmem_default(-1);
237 }
238 
239 void __init mem_init(void)
240 {
241         high_memory = (void *)__va(memory_start + lowmem_size - 1);
242 
243         /* this will put all memory onto the freelists */
244         free_all_bootmem();
245 #ifdef CONFIG_HIGHMEM
246         highmem_setup();
247 #endif
248 
249         mem_init_print_info(NULL);
250 #ifdef CONFIG_MMU
251         pr_info("Kernel virtual memory layout:\n");
252         pr_info("  * 0x%08lx..0x%08lx  : fixmap\n", FIXADDR_START, FIXADDR_TOP);
253 #ifdef CONFIG_HIGHMEM
254         pr_info("  * 0x%08lx..0x%08lx  : highmem PTEs\n",
255                 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
256 #endif /* CONFIG_HIGHMEM */
257         pr_info("  * 0x%08lx..0x%08lx  : early ioremap\n",
258                 ioremap_bot, ioremap_base);
259         pr_info("  * 0x%08lx..0x%08lx  : vmalloc & ioremap\n",
260                 (unsigned long)VMALLOC_START, VMALLOC_END);
261 #endif
262         mem_init_done = 1;
263 }
264 
265 #ifndef CONFIG_MMU
266 int page_is_ram(unsigned long pfn)
267 {
268         return __range_ok(pfn, 0);
269 }
270 #else
271 int page_is_ram(unsigned long pfn)
272 {
273         return pfn < max_low_pfn;
274 }
275 
276 /*
277  * Check for command-line options that affect what MMU_init will do.
278  */
279 static void mm_cmdline_setup(void)
280 {
281         unsigned long maxmem = 0;
282         char *p = cmd_line;
283 
284         /* Look for mem= option on command line */
285         p = strstr(cmd_line, "mem=");
286         if (p) {
287                 p += 4;
288                 maxmem = memparse(p, &p);
289                 if (maxmem && memory_size > maxmem) {
290                         memory_size = maxmem;
291                         memblock.memory.regions[0].size = memory_size;
292                 }
293         }
294 }
295 
296 /*
297  * MMU_init_hw does the chip-specific initialization of the MMU hardware.
298  */
299 static void __init mmu_init_hw(void)
300 {
301         /*
302          * The Zone Protection Register (ZPR) defines how protection will
303          * be applied to every page which is a member of a given zone. At
304          * present, we utilize only two of the zones.
305          * The zone index bits (of ZSEL) in the PTE are used for software
306          * indicators, except the LSB.  For user access, zone 1 is used,
307          * for kernel access, zone 0 is used.  We set all but zone 1
308          * to zero, allowing only kernel access as indicated in the PTE.
309          * For zone 1, we set a 01 binary (a value of 10 will not work)
310          * to allow user access as indicated in the PTE.  This also allows
311          * kernel access as indicated in the PTE.
312          */
313         __asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
314                         "mts rzpr, r11;"
315                         : : : "r11");
316 }
317 
318 /*
319  * MMU_init sets up the basic memory mappings for the kernel,
320  * including both RAM and possibly some I/O regions,
321  * and sets up the page tables and the MMU hardware ready to go.
322  */
323 
324 /* called from head.S */
325 asmlinkage void __init mmu_init(void)
326 {
327         unsigned int kstart, ksize;
328 
329         if (!memblock.reserved.cnt) {
330                 pr_emerg("Error memory count\n");
331                 machine_restart(NULL);
332         }
333 
334         if ((u32) memblock.memory.regions[0].size < 0x400000) {
335                 pr_emerg("Memory must be greater than 4MB\n");
336                 machine_restart(NULL);
337         }
338 
339         if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
340                 pr_emerg("Kernel size is greater than memory node\n");
341                 machine_restart(NULL);
342         }
343 
344         /* Find main memory where the kernel is */
345         memory_start = (u32) memblock.memory.regions[0].base;
346         lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
347 
348         if (lowmem_size > CONFIG_LOWMEM_SIZE) {
349                 lowmem_size = CONFIG_LOWMEM_SIZE;
350 #ifndef CONFIG_HIGHMEM
351                 memory_size = lowmem_size;
352 #endif
353         }
354 
355         mm_cmdline_setup(); /* FIXME parse args from command line - not used */
356 
357         /*
358          * Map out the kernel text/data/bss from the available physical
359          * memory.
360          */
361         kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
362         /* kernel size */
363         ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
364         memblock_reserve(kstart, ksize);
365 
366 #if defined(CONFIG_BLK_DEV_INITRD)
367         /* Remove the init RAM disk from the available memory. */
368         if (initrd_start) {
369                 unsigned long size;
370                 size = initrd_end - initrd_start;
371                 memblock_reserve(virt_to_phys(initrd_start), size);
372         }
373 #endif /* CONFIG_BLK_DEV_INITRD */
374 
375         /* Initialize the MMU hardware */
376         mmu_init_hw();
377 
378         /* Map in all of RAM starting at CONFIG_KERNEL_START */
379         mapin_ram();
380 
381         /* Extend vmalloc and ioremap area as big as possible */
382 #ifdef CONFIG_HIGHMEM
383         ioremap_base = ioremap_bot = PKMAP_BASE;
384 #else
385         ioremap_base = ioremap_bot = FIXADDR_START;
386 #endif
387 
388         /* Initialize the context management stuff */
389         mmu_context_init();
390 
391         /* Shortly after that, the entire linear mapping will be available */
392         /* This will also cause that unflatten device tree will be allocated
393          * inside 768MB limit */
394         memblock_set_current_limit(memory_start + lowmem_size - 1);
395 }
396 
397 /* This is only called until mem_init is done. */
398 void __init *early_get_page(void)
399 {
400         void *p;
401         if (init_bootmem_done) {
402                 p = alloc_bootmem_pages(PAGE_SIZE);
403         } else {
404                 /*
405                  * Mem start + kernel_tlb -> here is limit
406                  * because of mem mapping from head.S
407                  */
408                 p = __va(memblock_alloc_base(PAGE_SIZE, PAGE_SIZE,
409                                         memory_start + kernel_tlb));
410         }
411         return p;
412 }
413 
414 #endif /* CONFIG_MMU */
415 
416 void * __init_refok alloc_maybe_bootmem(size_t size, gfp_t mask)
417 {
418         if (mem_init_done)
419                 return kmalloc(size, mask);
420         else
421                 return alloc_bootmem(size);
422 }
423 
424 void * __init_refok zalloc_maybe_bootmem(size_t size, gfp_t mask)
425 {
426         void *p;
427 
428         if (mem_init_done)
429                 p = kzalloc(size, mask);
430         else {
431                 p = alloc_bootmem(size);
432                 if (p)
433                         memset(p, 0, size);
434         }
435         return p;
436 }
437 

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