Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[firefly-linux-kernel-4.4.55.git] / arch / sparc / mm / init_32.c
1 /*
2  *  linux/arch/sparc/mm/init.c
3  *
4  *  Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
5  *  Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
6  *  Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
7  *  Copyright (C) 2000 Anton Blanchard (anton@samba.org)
8  */
9
10 #include <linux/module.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
19 #include <linux/mm.h>
20 #include <linux/swap.h>
21 #include <linux/initrd.h>
22 #include <linux/init.h>
23 #include <linux/highmem.h>
24 #include <linux/bootmem.h>
25 #include <linux/pagemap.h>
26 #include <linux/poison.h>
27 #include <linux/gfp.h>
28
29 #include <asm/sections.h>
30 #include <asm/page.h>
31 #include <asm/pgtable.h>
32 #include <asm/vaddrs.h>
33 #include <asm/pgalloc.h>        /* bug in asm-generic/tlb.h: check_pgt_cache */
34 #include <asm/setup.h>
35 #include <asm/tlb.h>
36 #include <asm/prom.h>
37 #include <asm/leon.h>
38
39 #include "mm_32.h"
40
41 unsigned long *sparc_valid_addr_bitmap;
42 EXPORT_SYMBOL(sparc_valid_addr_bitmap);
43
44 unsigned long phys_base;
45 EXPORT_SYMBOL(phys_base);
46
47 unsigned long pfn_base;
48 EXPORT_SYMBOL(pfn_base);
49
50 struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
51
52 /* Initial ramdisk setup */
53 extern unsigned int sparc_ramdisk_image;
54 extern unsigned int sparc_ramdisk_size;
55
56 unsigned long highstart_pfn, highend_pfn;
57
58 void show_mem(unsigned int filter)
59 {
60         printk("Mem-info:\n");
61         show_free_areas(filter);
62         printk("Free swap:       %6ldkB\n",
63                get_nr_swap_pages() << (PAGE_SHIFT-10));
64         printk("%ld pages of RAM\n", totalram_pages);
65         printk("%ld free pages\n", nr_free_pages());
66 }
67
68
69 unsigned long last_valid_pfn;
70
71 unsigned long calc_highpages(void)
72 {
73         int i;
74         int nr = 0;
75
76         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
77                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
78                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
79
80                 if (end_pfn <= max_low_pfn)
81                         continue;
82
83                 if (start_pfn < max_low_pfn)
84                         start_pfn = max_low_pfn;
85
86                 nr += end_pfn - start_pfn;
87         }
88
89         return nr;
90 }
91
92 static unsigned long calc_max_low_pfn(void)
93 {
94         int i;
95         unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
96         unsigned long curr_pfn, last_pfn;
97
98         last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
99         for (i = 1; sp_banks[i].num_bytes != 0; i++) {
100                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
101
102                 if (curr_pfn >= tmp) {
103                         if (last_pfn < tmp)
104                                 tmp = last_pfn;
105                         break;
106                 }
107
108                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
109         }
110
111         return tmp;
112 }
113
114 unsigned long __init bootmem_init(unsigned long *pages_avail)
115 {
116         unsigned long bootmap_size, start_pfn;
117         unsigned long end_of_phys_memory = 0UL;
118         unsigned long bootmap_pfn, bytes_avail, size;
119         int i;
120
121         bytes_avail = 0UL;
122         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
123                 end_of_phys_memory = sp_banks[i].base_addr +
124                         sp_banks[i].num_bytes;
125                 bytes_avail += sp_banks[i].num_bytes;
126                 if (cmdline_memory_size) {
127                         if (bytes_avail > cmdline_memory_size) {
128                                 unsigned long slack = bytes_avail - cmdline_memory_size;
129
130                                 bytes_avail -= slack;
131                                 end_of_phys_memory -= slack;
132
133                                 sp_banks[i].num_bytes -= slack;
134                                 if (sp_banks[i].num_bytes == 0) {
135                                         sp_banks[i].base_addr = 0xdeadbeef;
136                                 } else {
137                                         sp_banks[i+1].num_bytes = 0;
138                                         sp_banks[i+1].base_addr = 0xdeadbeef;
139                                 }
140                                 break;
141                         }
142                 }
143         }
144
145         /* Start with page aligned address of last symbol in kernel
146          * image.  
147          */
148         start_pfn  = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
149
150         /* Now shift down to get the real physical page frame number. */
151         start_pfn >>= PAGE_SHIFT;
152
153         bootmap_pfn = start_pfn;
154
155         max_pfn = end_of_phys_memory >> PAGE_SHIFT;
156
157         max_low_pfn = max_pfn;
158         highstart_pfn = highend_pfn = max_pfn;
159
160         if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
161                 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
162                 max_low_pfn = calc_max_low_pfn();
163                 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
164                     calc_highpages() >> (20 - PAGE_SHIFT));
165         }
166
167 #ifdef CONFIG_BLK_DEV_INITRD
168         /* Now have to check initial ramdisk, so that bootmap does not overwrite it */
169         if (sparc_ramdisk_image) {
170                 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
171                         sparc_ramdisk_image -= KERNBASE;
172                 initrd_start = sparc_ramdisk_image + phys_base;
173                 initrd_end = initrd_start + sparc_ramdisk_size;
174                 if (initrd_end > end_of_phys_memory) {
175                         printk(KERN_CRIT "initrd extends beyond end of memory "
176                                          "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
177                                initrd_end, end_of_phys_memory);
178                         initrd_start = 0;
179                 }
180                 if (initrd_start) {
181                         if (initrd_start >= (start_pfn << PAGE_SHIFT) &&
182                             initrd_start < (start_pfn << PAGE_SHIFT) + 2 * PAGE_SIZE)
183                                 bootmap_pfn = PAGE_ALIGN (initrd_end) >> PAGE_SHIFT;
184                 }
185         }
186 #endif  
187         /* Initialize the boot-time allocator. */
188         bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
189                                          max_low_pfn);
190
191         /* Now register the available physical memory with the
192          * allocator.
193          */
194         *pages_avail = 0;
195         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
196                 unsigned long curr_pfn, last_pfn;
197
198                 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
199                 if (curr_pfn >= max_low_pfn)
200                         break;
201
202                 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
203                 if (last_pfn > max_low_pfn)
204                         last_pfn = max_low_pfn;
205
206                 /*
207                  * .. finally, did all the rounding and playing
208                  * around just make the area go away?
209                  */
210                 if (last_pfn <= curr_pfn)
211                         continue;
212
213                 size = (last_pfn - curr_pfn) << PAGE_SHIFT;
214                 *pages_avail += last_pfn - curr_pfn;
215
216                 free_bootmem(sp_banks[i].base_addr, size);
217         }
218
219 #ifdef CONFIG_BLK_DEV_INITRD
220         if (initrd_start) {
221                 /* Reserve the initrd image area. */
222                 size = initrd_end - initrd_start;
223                 reserve_bootmem(initrd_start, size, BOOTMEM_DEFAULT);
224                 *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
225
226                 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
227                 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;            
228         }
229 #endif
230         /* Reserve the kernel text/data/bss. */
231         size = (start_pfn << PAGE_SHIFT) - phys_base;
232         reserve_bootmem(phys_base, size, BOOTMEM_DEFAULT);
233         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
234
235         /* Reserve the bootmem map.   We do not account for it
236          * in pages_avail because we will release that memory
237          * in free_all_bootmem.
238          */
239         size = bootmap_size;
240         reserve_bootmem((bootmap_pfn << PAGE_SHIFT), size, BOOTMEM_DEFAULT);
241         *pages_avail -= PAGE_ALIGN(size) >> PAGE_SHIFT;
242
243         return max_pfn;
244 }
245
246 /*
247  * paging_init() sets up the page tables: We call the MMU specific
248  * init routine based upon the Sun model type on the Sparc.
249  *
250  */
251 void __init paging_init(void)
252 {
253         srmmu_paging_init();
254         prom_build_devicetree();
255         of_fill_in_cpu_data();
256         device_scan();
257 }
258
259 static void __init taint_real_pages(void)
260 {
261         int i;
262
263         for (i = 0; sp_banks[i].num_bytes; i++) {
264                 unsigned long start, end;
265
266                 start = sp_banks[i].base_addr;
267                 end = start + sp_banks[i].num_bytes;
268
269                 while (start < end) {
270                         set_bit(start >> 20, sparc_valid_addr_bitmap);
271                         start += PAGE_SIZE;
272                 }
273         }
274 }
275
276 static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
277 {
278         unsigned long tmp;
279
280 #ifdef CONFIG_DEBUG_HIGHMEM
281         printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
282 #endif
283
284         for (tmp = start_pfn; tmp < end_pfn; tmp++)
285                 free_highmem_page(pfn_to_page(tmp));
286 }
287
288 void __init mem_init(void)
289 {
290         int i;
291
292         if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
293                 prom_printf("BUG: fixmap and pkmap areas overlap\n");
294                 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
295                        PKMAP_BASE,
296                        (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
297                        FIXADDR_START);
298                 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
299                 prom_halt();
300         }
301
302
303         /* Saves us work later. */
304         memset((void *)&empty_zero_page, 0, PAGE_SIZE);
305
306         i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
307         i += 1;
308         sparc_valid_addr_bitmap = (unsigned long *)
309                 __alloc_bootmem(i << 2, SMP_CACHE_BYTES, 0UL);
310
311         if (sparc_valid_addr_bitmap == NULL) {
312                 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
313                 prom_halt();
314         }
315         memset(sparc_valid_addr_bitmap, 0, i << 2);
316
317         taint_real_pages();
318
319         max_mapnr = last_valid_pfn - pfn_base;
320         high_memory = __va(max_low_pfn << PAGE_SHIFT);
321         free_all_bootmem();
322
323         for (i = 0; sp_banks[i].num_bytes != 0; i++) {
324                 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
325                 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
326
327                 if (end_pfn <= highstart_pfn)
328                         continue;
329
330                 if (start_pfn < highstart_pfn)
331                         start_pfn = highstart_pfn;
332
333                 map_high_region(start_pfn, end_pfn);
334         }
335         
336         mem_init_print_info(NULL);
337 }
338
339 void free_initmem (void)
340 {
341         free_initmem_default(POISON_FREE_INITMEM);
342 }
343
344 #ifdef CONFIG_BLK_DEV_INITRD
345 void free_initrd_mem(unsigned long start, unsigned long end)
346 {
347         free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
348                            "initrd");
349 }
350 #endif
351
352 void sparc_flush_page_to_ram(struct page *page)
353 {
354         unsigned long vaddr = (unsigned long)page_address(page);
355
356         if (vaddr)
357                 __flush_page_to_ram(vaddr);
358 }
359 EXPORT_SYMBOL(sparc_flush_page_to_ram);