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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>
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
41unsigned long *sparc_valid_addr_bitmap;
42EXPORT_SYMBOL(sparc_valid_addr_bitmap);
43
44unsigned long phys_base;
45EXPORT_SYMBOL(phys_base);
46
47unsigned long pfn_base;
48EXPORT_SYMBOL(pfn_base);
49
50struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
51
52
53extern unsigned int sparc_ramdisk_image;
54extern unsigned int sparc_ramdisk_size;
55
56unsigned long highstart_pfn, highend_pfn;
57
58void 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
69unsigned long last_valid_pfn;
70
71unsigned 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
92static 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
114unsigned 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
146
147
148 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
149
150
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
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
188 bootmap_size = init_bootmem_node(NODE_DATA(0), bootmap_pfn, pfn_base,
189 max_low_pfn);
190
191
192
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
208
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
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
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
236
237
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
248
249
250
251void __init paging_init(void)
252{
253 srmmu_paging_init();
254 prom_build_devicetree();
255 of_fill_in_cpu_data();
256 device_scan();
257}
258
259static 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
276static 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
288void __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
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
339void free_initmem (void)
340{
341 free_initmem_default(POISON_FREE_INITMEM);
342}
343
344#ifdef CONFIG_BLK_DEV_INITRD
345void 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
352void 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}
359EXPORT_SYMBOL(sparc_flush_page_to_ram);
360
