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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sparc/mm/init.c
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
9 */
10
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/vaddrs.h>
33#include <asm/setup.h>
34#include <asm/tlb.h>
35#include <asm/prom.h>
36#include <asm/leon.h>
37
38#include "mm_32.h"
39
40static unsigned long *sparc_valid_addr_bitmap;
41
42unsigned long phys_base;
43EXPORT_SYMBOL(phys_base);
44
45unsigned long pfn_base;
46EXPORT_SYMBOL(pfn_base);
47
48struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
49
50/* Initial ramdisk setup */
51extern unsigned int sparc_ramdisk_image;
52extern unsigned int sparc_ramdisk_size;
53
54unsigned long highstart_pfn, highend_pfn;
55
56unsigned long last_valid_pfn;
57
58unsigned long calc_highpages(void)
59{
60 int i;
61 int nr = 0;
62
63 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
64 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
65 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
66
67 if (end_pfn <= max_low_pfn)
68 continue;
69
70 if (start_pfn < max_low_pfn)
71 start_pfn = max_low_pfn;
72
73 nr += end_pfn - start_pfn;
74 }
75
76 return nr;
77}
78
79static unsigned long calc_max_low_pfn(void)
80{
81 int i;
82 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
83 unsigned long curr_pfn, last_pfn;
84
85 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
86 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
87 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
88
89 if (curr_pfn >= tmp) {
90 if (last_pfn < tmp)
91 tmp = last_pfn;
92 break;
93 }
94
95 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
96 }
97
98 return tmp;
99}
100
101static void __init find_ramdisk(unsigned long end_of_phys_memory)
102{
103#ifdef CONFIG_BLK_DEV_INITRD
104 unsigned long size;
105
106 /* Now have to check initial ramdisk, so that it won't pass
107 * the end of memory
108 */
109 if (sparc_ramdisk_image) {
110 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
111 sparc_ramdisk_image -= KERNBASE;
112 initrd_start = sparc_ramdisk_image + phys_base;
113 initrd_end = initrd_start + sparc_ramdisk_size;
114 if (initrd_end > end_of_phys_memory) {
115 printk(KERN_CRIT "initrd extends beyond end of memory "
116 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
117 initrd_end, end_of_phys_memory);
118 initrd_start = 0;
119 } else {
120 /* Reserve the initrd image area. */
121 size = initrd_end - initrd_start;
122 memblock_reserve(initrd_start, size);
123
124 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
125 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
126 }
127 }
128#endif
129}
130
131unsigned long __init bootmem_init(unsigned long *pages_avail)
132{
133 unsigned long start_pfn, bytes_avail, size;
134 unsigned long end_of_phys_memory = 0;
135 unsigned long high_pages = 0;
136 int i;
137
138 memblock_set_bottom_up(true);
139 memblock_allow_resize();
140
141 bytes_avail = 0UL;
142 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
143 end_of_phys_memory = sp_banks[i].base_addr +
144 sp_banks[i].num_bytes;
145 bytes_avail += sp_banks[i].num_bytes;
146 if (cmdline_memory_size) {
147 if (bytes_avail > cmdline_memory_size) {
148 unsigned long slack = bytes_avail - cmdline_memory_size;
149
150 bytes_avail -= slack;
151 end_of_phys_memory -= slack;
152
153 sp_banks[i].num_bytes -= slack;
154 if (sp_banks[i].num_bytes == 0) {
155 sp_banks[i].base_addr = 0xdeadbeef;
156 } else {
157 memblock_add(sp_banks[i].base_addr,
158 sp_banks[i].num_bytes);
159 sp_banks[i+1].num_bytes = 0;
160 sp_banks[i+1].base_addr = 0xdeadbeef;
161 }
162 break;
163 }
164 }
165 memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
166 }
167
168 /* Start with page aligned address of last symbol in kernel
169 * image.
170 */
171 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
172
173 /* Now shift down to get the real physical page frame number. */
174 start_pfn >>= PAGE_SHIFT;
175
176 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
177
178 max_low_pfn = max_pfn;
179 highstart_pfn = highend_pfn = max_pfn;
180
181 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
182 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
183 max_low_pfn = calc_max_low_pfn();
184 high_pages = calc_highpages();
185 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
186 high_pages >> (20 - PAGE_SHIFT));
187 }
188
189 find_ramdisk(end_of_phys_memory);
190
191 /* Reserve the kernel text/data/bss. */
192 size = (start_pfn << PAGE_SHIFT) - phys_base;
193 memblock_reserve(phys_base, size);
194 memblock_add(phys_base, size);
195
196 size = memblock_phys_mem_size() - memblock_reserved_size();
197 *pages_avail = (size >> PAGE_SHIFT) - high_pages;
198
199 /* Only allow low memory to be allocated via memblock allocation */
200 memblock_set_current_limit(max_low_pfn << PAGE_SHIFT);
201
202 return max_pfn;
203}
204
205/*
206 * paging_init() sets up the page tables: We call the MMU specific
207 * init routine based upon the Sun model type on the Sparc.
208 *
209 */
210void __init paging_init(void)
211{
212 srmmu_paging_init();
213 prom_build_devicetree();
214 of_fill_in_cpu_data();
215 device_scan();
216}
217
218static void __init taint_real_pages(void)
219{
220 int i;
221
222 for (i = 0; sp_banks[i].num_bytes; i++) {
223 unsigned long start, end;
224
225 start = sp_banks[i].base_addr;
226 end = start + sp_banks[i].num_bytes;
227
228 while (start < end) {
229 set_bit(start >> 20, sparc_valid_addr_bitmap);
230 start += PAGE_SIZE;
231 }
232 }
233}
234
235static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
236{
237 unsigned long tmp;
238
239#ifdef CONFIG_DEBUG_HIGHMEM
240 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
241#endif
242
243 for (tmp = start_pfn; tmp < end_pfn; tmp++)
244 free_highmem_page(pfn_to_page(tmp));
245}
246
247void __init mem_init(void)
248{
249 int i;
250
251 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
252 prom_printf("BUG: fixmap and pkmap areas overlap\n");
253 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
254 PKMAP_BASE,
255 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
256 FIXADDR_START);
257 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
258 prom_halt();
259 }
260
261
262 /* Saves us work later. */
263 memset((void *)empty_zero_page, 0, PAGE_SIZE);
264
265 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
266 i += 1;
267 sparc_valid_addr_bitmap = (unsigned long *)
268 memblock_alloc(i << 2, SMP_CACHE_BYTES);
269
270 if (sparc_valid_addr_bitmap == NULL) {
271 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
272 prom_halt();
273 }
274 memset(sparc_valid_addr_bitmap, 0, i << 2);
275
276 taint_real_pages();
277
278 max_mapnr = last_valid_pfn - pfn_base;
279 high_memory = __va(max_low_pfn << PAGE_SHIFT);
280 memblock_free_all();
281
282 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
283 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
284 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
285
286 if (end_pfn <= highstart_pfn)
287 continue;
288
289 if (start_pfn < highstart_pfn)
290 start_pfn = highstart_pfn;
291
292 map_high_region(start_pfn, end_pfn);
293 }
294}
295
296void sparc_flush_page_to_ram(struct page *page)
297{
298 unsigned long vaddr = (unsigned long)page_address(page);
299
300 if (vaddr)
301 __flush_page_to_ram(vaddr);
302}
303EXPORT_SYMBOL(sparc_flush_page_to_ram);
304
305static const pgprot_t protection_map[16] = {
306 [VM_NONE] = PAGE_NONE,
307 [VM_READ] = PAGE_READONLY,
308 [VM_WRITE] = PAGE_COPY,
309 [VM_WRITE | VM_READ] = PAGE_COPY,
310 [VM_EXEC] = PAGE_READONLY,
311 [VM_EXEC | VM_READ] = PAGE_READONLY,
312 [VM_EXEC | VM_WRITE] = PAGE_COPY,
313 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY,
314 [VM_SHARED] = PAGE_NONE,
315 [VM_SHARED | VM_READ] = PAGE_READONLY,
316 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
317 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
318 [VM_SHARED | VM_EXEC] = PAGE_READONLY,
319 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY,
320 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
321 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED
322};
323DECLARE_VM_GET_PAGE_PROT
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/arch/sparc/mm/init.c
4 *
5 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
6 * Copyright (C) 1995 Eddie C. Dost (ecd@skynet.be)
7 * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8 * Copyright (C) 2000 Anton Blanchard (anton@samba.org)
9 */
10
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/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/* Initial ramdisk setup */
53extern unsigned int sparc_ramdisk_image;
54extern unsigned int sparc_ramdisk_size;
55
56unsigned long highstart_pfn, highend_pfn;
57
58unsigned long last_valid_pfn;
59
60unsigned long calc_highpages(void)
61{
62 int i;
63 int nr = 0;
64
65 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
66 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
67 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
68
69 if (end_pfn <= max_low_pfn)
70 continue;
71
72 if (start_pfn < max_low_pfn)
73 start_pfn = max_low_pfn;
74
75 nr += end_pfn - start_pfn;
76 }
77
78 return nr;
79}
80
81static unsigned long calc_max_low_pfn(void)
82{
83 int i;
84 unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
85 unsigned long curr_pfn, last_pfn;
86
87 last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
88 for (i = 1; sp_banks[i].num_bytes != 0; i++) {
89 curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
90
91 if (curr_pfn >= tmp) {
92 if (last_pfn < tmp)
93 tmp = last_pfn;
94 break;
95 }
96
97 last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
98 }
99
100 return tmp;
101}
102
103static void __init find_ramdisk(unsigned long end_of_phys_memory)
104{
105#ifdef CONFIG_BLK_DEV_INITRD
106 unsigned long size;
107
108 /* Now have to check initial ramdisk, so that it won't pass
109 * the end of memory
110 */
111 if (sparc_ramdisk_image) {
112 if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
113 sparc_ramdisk_image -= KERNBASE;
114 initrd_start = sparc_ramdisk_image + phys_base;
115 initrd_end = initrd_start + sparc_ramdisk_size;
116 if (initrd_end > end_of_phys_memory) {
117 printk(KERN_CRIT "initrd extends beyond end of memory "
118 "(0x%016lx > 0x%016lx)\ndisabling initrd\n",
119 initrd_end, end_of_phys_memory);
120 initrd_start = 0;
121 } else {
122 /* Reserve the initrd image area. */
123 size = initrd_end - initrd_start;
124 memblock_reserve(initrd_start, size);
125
126 initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
127 initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
128 }
129 }
130#endif
131}
132
133unsigned long __init bootmem_init(unsigned long *pages_avail)
134{
135 unsigned long start_pfn, bytes_avail, size;
136 unsigned long end_of_phys_memory = 0;
137 unsigned long high_pages = 0;
138 int i;
139
140 memblock_set_bottom_up(true);
141 memblock_allow_resize();
142
143 bytes_avail = 0UL;
144 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
145 end_of_phys_memory = sp_banks[i].base_addr +
146 sp_banks[i].num_bytes;
147 bytes_avail += sp_banks[i].num_bytes;
148 if (cmdline_memory_size) {
149 if (bytes_avail > cmdline_memory_size) {
150 unsigned long slack = bytes_avail - cmdline_memory_size;
151
152 bytes_avail -= slack;
153 end_of_phys_memory -= slack;
154
155 sp_banks[i].num_bytes -= slack;
156 if (sp_banks[i].num_bytes == 0) {
157 sp_banks[i].base_addr = 0xdeadbeef;
158 } else {
159 memblock_add(sp_banks[i].base_addr,
160 sp_banks[i].num_bytes);
161 sp_banks[i+1].num_bytes = 0;
162 sp_banks[i+1].base_addr = 0xdeadbeef;
163 }
164 break;
165 }
166 }
167 memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
168 }
169
170 /* Start with page aligned address of last symbol in kernel
171 * image.
172 */
173 start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
174
175 /* Now shift down to get the real physical page frame number. */
176 start_pfn >>= PAGE_SHIFT;
177
178 max_pfn = end_of_phys_memory >> PAGE_SHIFT;
179
180 max_low_pfn = max_pfn;
181 highstart_pfn = highend_pfn = max_pfn;
182
183 if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
184 highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
185 max_low_pfn = calc_max_low_pfn();
186 high_pages = calc_highpages();
187 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
188 high_pages >> (20 - PAGE_SHIFT));
189 }
190
191 find_ramdisk(end_of_phys_memory);
192
193 /* Reserve the kernel text/data/bss. */
194 size = (start_pfn << PAGE_SHIFT) - phys_base;
195 memblock_reserve(phys_base, size);
196
197 size = memblock_phys_mem_size() - memblock_reserved_size();
198 *pages_avail = (size >> PAGE_SHIFT) - high_pages;
199
200 return max_pfn;
201}
202
203/*
204 * paging_init() sets up the page tables: We call the MMU specific
205 * init routine based upon the Sun model type on the Sparc.
206 *
207 */
208void __init paging_init(void)
209{
210 srmmu_paging_init();
211 prom_build_devicetree();
212 of_fill_in_cpu_data();
213 device_scan();
214}
215
216static void __init taint_real_pages(void)
217{
218 int i;
219
220 for (i = 0; sp_banks[i].num_bytes; i++) {
221 unsigned long start, end;
222
223 start = sp_banks[i].base_addr;
224 end = start + sp_banks[i].num_bytes;
225
226 while (start < end) {
227 set_bit(start >> 20, sparc_valid_addr_bitmap);
228 start += PAGE_SIZE;
229 }
230 }
231}
232
233static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
234{
235 unsigned long tmp;
236
237#ifdef CONFIG_DEBUG_HIGHMEM
238 printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
239#endif
240
241 for (tmp = start_pfn; tmp < end_pfn; tmp++)
242 free_highmem_page(pfn_to_page(tmp));
243}
244
245void __init mem_init(void)
246{
247 int i;
248
249 if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
250 prom_printf("BUG: fixmap and pkmap areas overlap\n");
251 prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
252 PKMAP_BASE,
253 (unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
254 FIXADDR_START);
255 prom_printf("Please mail sparclinux@vger.kernel.org.\n");
256 prom_halt();
257 }
258
259
260 /* Saves us work later. */
261 memset((void *)empty_zero_page, 0, PAGE_SIZE);
262
263 i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
264 i += 1;
265 sparc_valid_addr_bitmap = (unsigned long *)
266 memblock_alloc(i << 2, SMP_CACHE_BYTES);
267
268 if (sparc_valid_addr_bitmap == NULL) {
269 prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
270 prom_halt();
271 }
272 memset(sparc_valid_addr_bitmap, 0, i << 2);
273
274 taint_real_pages();
275
276 max_mapnr = last_valid_pfn - pfn_base;
277 high_memory = __va(max_low_pfn << PAGE_SHIFT);
278 memblock_free_all();
279
280 for (i = 0; sp_banks[i].num_bytes != 0; i++) {
281 unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
282 unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
283
284 if (end_pfn <= highstart_pfn)
285 continue;
286
287 if (start_pfn < highstart_pfn)
288 start_pfn = highstart_pfn;
289
290 map_high_region(start_pfn, end_pfn);
291 }
292
293 mem_init_print_info(NULL);
294}
295
296void sparc_flush_page_to_ram(struct page *page)
297{
298 unsigned long vaddr = (unsigned long)page_address(page);
299
300 if (vaddr)
301 __flush_page_to_ram(vaddr);
302}
303EXPORT_SYMBOL(sparc_flush_page_to_ram);