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11#include <linux/module.h>
12#include <linux/signal.h>
13#include <linux/sched.h>
14#include <linux/kernel.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include <linux/types.h>
18#include <linux/ptrace.h>
19#include <linux/mman.h>
20#include <linux/mm.h>
21#include <linux/swap.h>
22#include <linux/initrd.h>
23#include <linux/init.h>
24#include <linux/highmem.h>
25#include <linux/memblock.h>
26#include <linux/pagemap.h>
27#include <linux/poison.h>
28#include <linux/gfp.h>
29
30#include <asm/sections.h>
31#include <asm/page.h>
32#include <asm/pgtable.h>
33#include <asm/vaddrs.h>
34#include <asm/pgalloc.h>
35#include <asm/setup.h>
36#include <asm/tlb.h>
37#include <asm/prom.h>
38#include <asm/leon.h>
39
40#include "mm_32.h"
41
42unsigned long *sparc_valid_addr_bitmap;
43EXPORT_SYMBOL(sparc_valid_addr_bitmap);
44
45unsigned long phys_base;
46EXPORT_SYMBOL(phys_base);
47
48unsigned long pfn_base;
49EXPORT_SYMBOL(pfn_base);
50
51struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
52
53
54extern unsigned int sparc_ramdisk_image;
55extern unsigned int sparc_ramdisk_size;
56
57unsigned long highstart_pfn, highend_pfn;
58
59unsigned long last_valid_pfn;
60
61unsigned long calc_highpages(void)
62{
63 int i;
64 int nr = 0;
65
66 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
67 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
68 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
69
70 if (end_pfn <= max_low_pfn)
71 continue;
72
73 if (start_pfn < max_low_pfn)
74 start_pfn = max_low_pfn;
75
76 nr += end_pfn - start_pfn;
77 }
78
79 return nr;
80}
81
82static unsigned long calc_max_low_pfn(void)
83{
84 int i;
85 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
86 unsigned long curr_pfn, last_pfn;
87
88 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
89 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
90 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
91
92 if (curr_pfn >= tmp) {
93 if (last_pfn < tmp)
94 tmp = last_pfn;
95 break;
96 }
97
98 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
99 }
100
101 return tmp;
102}
103
104static void __init find_ramdisk(unsigned long end_of_phys_memory)
105{
106#ifdef CONFIG_BLK_DEV_INITRD
107 unsigned long size;
108
109
110
111
112 if (sparc_ramdisk_image) {
113 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
114 sparc_ramdisk_image -= KERNBASE;
115 initrd_start = sparc_ramdisk_image + phys_base;
116 initrd_end = initrd_start + sparc_ramdisk_size;
117 if (initrd_end > end_of_phys_memory) {
118 printk(KERN_CRIT "initrd extends beyond end of memory "
119 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
120 initrd_end, end_of_phys_memory);
121 initrd_start = 0;
122 } else {
123
124 size = initrd_end - initrd_start;
125 memblock_reserve(initrd_start, size);
126
127 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
128 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
129 }
130 }
131#endif
132}
133
134unsigned long __init bootmem_init(unsigned long *pages_avail)
135{
136 unsigned long start_pfn, bytes_avail, size;
137 unsigned long end_of_phys_memory = 0;
138 unsigned long high_pages = 0;
139 int i;
140
141 memblock_set_bottom_up(true);
142 memblock_allow_resize();
143
144 bytes_avail = 0UL;
145 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
146 end_of_phys_memory = sp_banks[i].base_addr +
147 sp_banks[i].num_bytes;
148 bytes_avail += sp_banks[i].num_bytes;
149 if (cmdline_memory_size) {
150 if (bytes_avail > cmdline_memory_size) {
151 unsigned long slack = bytes_avail - cmdline_memory_size;
152
153 bytes_avail -= slack;
154 end_of_phys_memory -= slack;
155
156 sp_banks[i].num_bytes -= slack;
157 if (sp_banks[i].num_bytes == 0) {
158 sp_banks[i].base_addr = 0xdeadbeef;
159 } else {
160 memblock_add(sp_banks[i].base_addr,
161 sp_banks[i].num_bytes);
162 sp_banks[i+1].num_bytes = 0;
163 sp_banks[i+1].base_addr = 0xdeadbeef;
164 }
165 break;
166 }
167 }
168 memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
169 }
170
171
172
173
174 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
175
176
177 start_pfn >>= PAGE_SHIFT;
178
179 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
180
181 max_low_pfn = max_pfn;
182 highstart_pfn = highend_pfn = max_pfn;
183
184 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
185 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
186 max_low_pfn = calc_max_low_pfn();
187 high_pages = calc_highpages();
188 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
189 high_pages >> (20 - PAGE_SHIFT));
190 }
191
192 find_ramdisk(end_of_phys_memory);
193
194
195 size = (start_pfn << PAGE_SHIFT) - phys_base;
196 memblock_reserve(phys_base, size);
197
198 size = memblock_phys_mem_size() - memblock_reserved_size();
199 *pages_avail = (size >> PAGE_SHIFT) - high_pages;
200
201 return max_pfn;
202}
203
204
205
206
207
208
209void __init paging_init(void)
210{
211 srmmu_paging_init();
212 prom_build_devicetree();
213 of_fill_in_cpu_data();
214 device_scan();
215}
216
217static void __init taint_real_pages(void)
218{
219 int i;
220
221 for (i = 0; sp_banks[i].num_bytes; i++) {
222 unsigned long start, end;
223
224 start = sp_banks[i].base_addr;
225 end = start + sp_banks[i].num_bytes;
226
227 while (start < end) {
228 set_bit(start >> 20, sparc_valid_addr_bitmap);
229 start += PAGE_SIZE;
230 }
231 }
232}
233
234static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
235{
236 unsigned long tmp;
237
238#ifdef CONFIG_DEBUG_HIGHMEM
239 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
240#endif
241
242 for (tmp = start_pfn; tmp < end_pfn; tmp++)
243 free_highmem_page(pfn_to_page(tmp));
244}
245
246void __init mem_init(void)
247{
248 int i;
249
250 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
251 prom_printf("BUG: fixmap and pkmap areas overlap\n");
252 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
253 PKMAP_BASE,
254 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
255 FIXADDR_START);
256 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
257 prom_halt();
258 }
259
260
261
262 memset((void *)empty_zero_page, 0, PAGE_SIZE);
263
264 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
265 i += 1;
266 sparc_valid_addr_bitmap = (unsigned long *)
267 memblock_alloc(i << 2, SMP_CACHE_BYTES);
268
269 if (sparc_valid_addr_bitmap == NULL) {
270 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
271 prom_halt();
272 }
273 memset(sparc_valid_addr_bitmap, 0, i << 2);
274
275 taint_real_pages();
276
277 max_mapnr = last_valid_pfn - pfn_base;
278 high_memory = __va(max_low_pfn << PAGE_SHIFT);
279 memblock_free_all();
280
281 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
282 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
283 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
284
285 if (end_pfn <= highstart_pfn)
286 continue;
287
288 if (start_pfn < highstart_pfn)
289 start_pfn = highstart_pfn;
290
291 map_high_region(start_pfn, end_pfn);
292 }
293
294 mem_init_print_info(NULL);
295}
296
297void sparc_flush_page_to_ram(struct page *page)
298{
299 unsigned long vaddr = (unsigned long)page_address(page);
300
301 if (vaddr)
302 __flush_page_to_ram(vaddr);
303}
304EXPORT_SYMBOL(sparc_flush_page_to_ram);
305
