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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/arch/parisc/mm/init.c | |
4 | * | |
5 | * Copyright (C) 1995 Linus Torvalds | |
6 | * Copyright 1999 SuSE GmbH | |
7 | * changed by Philipp Rumpf | |
8 | * Copyright 1999 Philipp Rumpf (prumpf@tux.org) | |
9 | * Copyright 2004 Randolph Chung (tausq@debian.org) | |
a8f44e38 | 10 | * Copyright 2006-2007 Helge Deller (deller@gmx.de) |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
1da177e4 LT |
14 | |
15 | #include <linux/module.h> | |
16 | #include <linux/mm.h> | |
4fe9e1d9 | 17 | #include <linux/memblock.h> |
5a0e3ad6 | 18 | #include <linux/gfp.h> |
1da177e4 LT |
19 | #include <linux/delay.h> |
20 | #include <linux/init.h> | |
1da177e4 LT |
21 | #include <linux/initrd.h> |
22 | #include <linux/swap.h> | |
23 | #include <linux/unistd.h> | |
24 | #include <linux/nodemask.h> /* for node_online_map */ | |
ea1754a0 | 25 | #include <linux/pagemap.h> /* for release_pages */ |
d0cf62fb | 26 | #include <linux/compat.h> |
0cc2dc49 | 27 | #include <linux/execmem.h> |
1da177e4 LT |
28 | |
29 | #include <asm/pgalloc.h> | |
30 | #include <asm/tlb.h> | |
31 | #include <asm/pdc_chassis.h> | |
32 | #include <asm/mmzone.h> | |
a581c2a4 | 33 | #include <asm/sections.h> |
d0cf62fb | 34 | #include <asm/msgbuf.h> |
dbdf0760 | 35 | #include <asm/sparsemem.h> |
e5ef93d0 | 36 | #include <asm/asm-offsets.h> |
bc46ef3c | 37 | #include <asm/shmbuf.h> |
1da177e4 | 38 | |
1da177e4 | 39 | extern int data_start; |
161bd3bf | 40 | extern void parisc_kernel_start(void); /* Kernel entry point in head.S */ |
1da177e4 | 41 | |
f24ffde4 | 42 | #if CONFIG_PGTABLE_LEVELS == 3 |
33def849 | 43 | pmd_t pmd0[PTRS_PER_PMD] __section(".data..vm0.pmd") __attribute__ ((aligned(PAGE_SIZE))); |
c39f52a9 TG |
44 | #endif |
45 | ||
33def849 JP |
46 | pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".data..vm0.pgd") __attribute__ ((aligned(PAGE_SIZE))); |
47 | pte_t pg0[PT_INITIAL * PTRS_PER_PTE] __section(".data..vm0.pte") __attribute__ ((aligned(PAGE_SIZE))); | |
c39f52a9 | 48 | |
1da177e4 LT |
49 | static struct resource data_resource = { |
50 | .name = "Kernel data", | |
35d98e93 | 51 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
1da177e4 LT |
52 | }; |
53 | ||
54 | static struct resource code_resource = { | |
55 | .name = "Kernel code", | |
35d98e93 | 56 | .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM, |
1da177e4 LT |
57 | }; |
58 | ||
59 | static struct resource pdcdata_resource = { | |
60 | .name = "PDC data (Page Zero)", | |
61 | .start = 0, | |
62 | .end = 0x9ff, | |
63 | .flags = IORESOURCE_BUSY | IORESOURCE_MEM, | |
64 | }; | |
65 | ||
4e617c86 | 66 | static struct resource sysram_resources[MAX_PHYSMEM_RANGES] __ro_after_init; |
1da177e4 LT |
67 | |
68 | /* The following array is initialized from the firmware specific | |
69 | * information retrieved in kernel/inventory.c. | |
70 | */ | |
71 | ||
dbdf0760 HD |
72 | physmem_range_t pmem_ranges[MAX_PHYSMEM_RANGES] __initdata; |
73 | int npmem_ranges __initdata; | |
1da177e4 | 74 | |
a8f44e38 | 75 | #ifdef CONFIG_64BIT |
dbdf0760 | 76 | #define MAX_MEM (1UL << MAX_PHYSMEM_BITS) |
a8f44e38 | 77 | #else /* !CONFIG_64BIT */ |
1da177e4 | 78 | #define MAX_MEM (3584U*1024U*1024U) |
a8f44e38 | 79 | #endif /* !CONFIG_64BIT */ |
1da177e4 | 80 | |
8039de10 | 81 | static unsigned long mem_limit __read_mostly = MAX_MEM; |
1da177e4 LT |
82 | |
83 | static void __init mem_limit_func(void) | |
84 | { | |
85 | char *cp, *end; | |
86 | unsigned long limit; | |
1da177e4 LT |
87 | |
88 | /* We need this before __setup() functions are called */ | |
89 | ||
90 | limit = MAX_MEM; | |
668f9931 | 91 | for (cp = boot_command_line; *cp; ) { |
1da177e4 LT |
92 | if (memcmp(cp, "mem=", 4) == 0) { |
93 | cp += 4; | |
94 | limit = memparse(cp, &end); | |
95 | if (end != cp) | |
96 | break; | |
97 | cp = end; | |
98 | } else { | |
99 | while (*cp != ' ' && *cp) | |
100 | ++cp; | |
101 | while (*cp == ' ') | |
102 | ++cp; | |
103 | } | |
104 | } | |
105 | ||
106 | if (limit < mem_limit) | |
107 | mem_limit = limit; | |
108 | } | |
109 | ||
110 | #define MAX_GAP (0x40000000UL >> PAGE_SHIFT) | |
111 | ||
112 | static void __init setup_bootmem(void) | |
113 | { | |
1da177e4 | 114 | unsigned long mem_max; |
dbdf0760 | 115 | #ifndef CONFIG_SPARSEMEM |
1da177e4 LT |
116 | physmem_range_t pmem_holes[MAX_PHYSMEM_RANGES - 1]; |
117 | int npmem_holes; | |
118 | #endif | |
119 | int i, sysram_resource_count; | |
120 | ||
121 | disable_sr_hashing(); /* Turn off space register hashing */ | |
122 | ||
123 | /* | |
124 | * Sort the ranges. Since the number of ranges is typically | |
125 | * small, and performance is not an issue here, just do | |
126 | * a simple insertion sort. | |
127 | */ | |
128 | ||
129 | for (i = 1; i < npmem_ranges; i++) { | |
130 | int j; | |
131 | ||
132 | for (j = i; j > 0; j--) { | |
1da177e4 LT |
133 | if (pmem_ranges[j-1].start_pfn < |
134 | pmem_ranges[j].start_pfn) { | |
135 | ||
136 | break; | |
137 | } | |
1ae8e91e | 138 | swap(pmem_ranges[j-1], pmem_ranges[j]); |
1da177e4 LT |
139 | } |
140 | } | |
141 | ||
dbdf0760 | 142 | #ifndef CONFIG_SPARSEMEM |
1da177e4 LT |
143 | /* |
144 | * Throw out ranges that are too far apart (controlled by | |
145 | * MAX_GAP). | |
146 | */ | |
147 | ||
148 | for (i = 1; i < npmem_ranges; i++) { | |
149 | if (pmem_ranges[i].start_pfn - | |
150 | (pmem_ranges[i-1].start_pfn + | |
151 | pmem_ranges[i-1].pages) > MAX_GAP) { | |
152 | npmem_ranges = i; | |
153 | printk("Large gap in memory detected (%ld pages). " | |
dbdf0760 | 154 | "Consider turning on CONFIG_SPARSEMEM\n", |
1da177e4 LT |
155 | pmem_ranges[i].start_pfn - |
156 | (pmem_ranges[i-1].start_pfn + | |
157 | pmem_ranges[i-1].pages)); | |
158 | break; | |
159 | } | |
160 | } | |
161 | #endif | |
162 | ||
4fe9e1d9 HD |
163 | /* Print the memory ranges */ |
164 | pr_info("Memory Ranges:\n"); | |
1da177e4 | 165 | |
4fe9e1d9 HD |
166 | for (i = 0; i < npmem_ranges; i++) { |
167 | struct resource *res = &sysram_resources[i]; | |
168 | unsigned long start; | |
169 | unsigned long size; | |
1da177e4 | 170 | |
4fe9e1d9 HD |
171 | size = (pmem_ranges[i].pages << PAGE_SHIFT); |
172 | start = (pmem_ranges[i].start_pfn << PAGE_SHIFT); | |
173 | pr_info("%2d) Start 0x%016lx End 0x%016lx Size %6ld MB\n", | |
174 | i, start, start + (size - 1), size >> 20); | |
1da177e4 | 175 | |
4fe9e1d9 | 176 | /* request memory resource */ |
1da177e4 | 177 | res->name = "System RAM"; |
4fe9e1d9 HD |
178 | res->start = start; |
179 | res->end = start + size - 1; | |
35d98e93 | 180 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
1da177e4 LT |
181 | request_resource(&iomem_resource, res); |
182 | } | |
183 | ||
4fe9e1d9 HD |
184 | sysram_resource_count = npmem_ranges; |
185 | ||
1da177e4 LT |
186 | /* |
187 | * For 32 bit kernels we limit the amount of memory we can | |
188 | * support, in order to preserve enough kernel address space | |
189 | * for other purposes. For 64 bit kernels we don't normally | |
190 | * limit the memory, but this mechanism can be used to | |
191 | * artificially limit the amount of memory (and it is written | |
192 | * to work with multiple memory ranges). | |
193 | */ | |
194 | ||
195 | mem_limit_func(); /* check for "mem=" argument */ | |
196 | ||
197 | mem_max = 0; | |
1da177e4 LT |
198 | for (i = 0; i < npmem_ranges; i++) { |
199 | unsigned long rsize; | |
200 | ||
201 | rsize = pmem_ranges[i].pages << PAGE_SHIFT; | |
202 | if ((mem_max + rsize) > mem_limit) { | |
203 | printk(KERN_WARNING "Memory truncated to %ld MB\n", mem_limit >> 20); | |
204 | if (mem_max == mem_limit) | |
205 | npmem_ranges = i; | |
206 | else { | |
207 | pmem_ranges[i].pages = (mem_limit >> PAGE_SHIFT) | |
208 | - (mem_max >> PAGE_SHIFT); | |
209 | npmem_ranges = i + 1; | |
210 | mem_max = mem_limit; | |
211 | } | |
1da177e4 LT |
212 | break; |
213 | } | |
1da177e4 LT |
214 | mem_max += rsize; |
215 | } | |
216 | ||
217 | printk(KERN_INFO "Total Memory: %ld MB\n",mem_max >> 20); | |
218 | ||
dbdf0760 | 219 | #ifndef CONFIG_SPARSEMEM |
1da177e4 | 220 | /* Merge the ranges, keeping track of the holes */ |
1da177e4 LT |
221 | { |
222 | unsigned long end_pfn; | |
223 | unsigned long hole_pages; | |
224 | ||
225 | npmem_holes = 0; | |
226 | end_pfn = pmem_ranges[0].start_pfn + pmem_ranges[0].pages; | |
227 | for (i = 1; i < npmem_ranges; i++) { | |
228 | ||
229 | hole_pages = pmem_ranges[i].start_pfn - end_pfn; | |
230 | if (hole_pages) { | |
231 | pmem_holes[npmem_holes].start_pfn = end_pfn; | |
232 | pmem_holes[npmem_holes++].pages = hole_pages; | |
233 | end_pfn += hole_pages; | |
234 | } | |
235 | end_pfn += pmem_ranges[i].pages; | |
236 | } | |
237 | ||
238 | pmem_ranges[0].pages = end_pfn - pmem_ranges[0].start_pfn; | |
239 | npmem_ranges = 1; | |
240 | } | |
241 | #endif | |
242 | ||
1da177e4 LT |
243 | /* |
244 | * Initialize and free the full range of memory in each range. | |
1da177e4 LT |
245 | */ |
246 | ||
1da177e4 LT |
247 | max_pfn = 0; |
248 | for (i = 0; i < npmem_ranges; i++) { | |
249 | unsigned long start_pfn; | |
250 | unsigned long npages; | |
4fe9e1d9 HD |
251 | unsigned long start; |
252 | unsigned long size; | |
1da177e4 LT |
253 | |
254 | start_pfn = pmem_ranges[i].start_pfn; | |
255 | npages = pmem_ranges[i].pages; | |
256 | ||
4fe9e1d9 HD |
257 | start = start_pfn << PAGE_SHIFT; |
258 | size = npages << PAGE_SHIFT; | |
259 | ||
260 | /* add system RAM memblock */ | |
261 | memblock_add(start, size); | |
262 | ||
1da177e4 LT |
263 | if ((start_pfn + npages) > max_pfn) |
264 | max_pfn = start_pfn + npages; | |
265 | } | |
266 | ||
6a528001 MR |
267 | /* |
268 | * We can't use memblock top-down allocations because we only | |
269 | * created the initial mapping up to KERNEL_INITIAL_SIZE in | |
270 | * the assembly bootup code. | |
271 | */ | |
272 | memblock_set_bottom_up(true); | |
273 | ||
5cdb8205 GG |
274 | /* IOMMU is always used to access "high mem" on those boxes |
275 | * that can support enough mem that a PCI device couldn't | |
276 | * directly DMA to any physical addresses. | |
277 | * ISA DMA support will need to revisit this. | |
278 | */ | |
279 | max_low_pfn = max_pfn; | |
280 | ||
1da177e4 LT |
281 | /* reserve PAGE0 pdc memory, kernel text/data/bss & bootmap */ |
282 | ||
283 | #define PDC_CONSOLE_IO_IODC_SIZE 32768 | |
284 | ||
4fe9e1d9 HD |
285 | memblock_reserve(0UL, (unsigned long)(PAGE0->mem_free + |
286 | PDC_CONSOLE_IO_IODC_SIZE)); | |
287 | memblock_reserve(__pa(KERNEL_BINARY_TEXT_START), | |
288 | (unsigned long)(_end - KERNEL_BINARY_TEXT_START)); | |
1da177e4 | 289 | |
dbdf0760 | 290 | #ifndef CONFIG_SPARSEMEM |
1da177e4 LT |
291 | |
292 | /* reserve the holes */ | |
293 | ||
294 | for (i = 0; i < npmem_holes; i++) { | |
4fe9e1d9 HD |
295 | memblock_reserve((pmem_holes[i].start_pfn << PAGE_SHIFT), |
296 | (pmem_holes[i].pages << PAGE_SHIFT)); | |
1da177e4 LT |
297 | } |
298 | #endif | |
299 | ||
300 | #ifdef CONFIG_BLK_DEV_INITRD | |
301 | if (initrd_start) { | |
302 | printk(KERN_INFO "initrd: %08lx-%08lx\n", initrd_start, initrd_end); | |
303 | if (__pa(initrd_start) < mem_max) { | |
304 | unsigned long initrd_reserve; | |
305 | ||
306 | if (__pa(initrd_end) > mem_max) { | |
307 | initrd_reserve = mem_max - __pa(initrd_start); | |
308 | } else { | |
309 | initrd_reserve = initrd_end - initrd_start; | |
310 | } | |
311 | initrd_below_start_ok = 1; | |
312 | printk(KERN_INFO "initrd: reserving %08lx-%08lx (mem_max %08lx)\n", __pa(initrd_start), __pa(initrd_start) + initrd_reserve, mem_max); | |
313 | ||
4fe9e1d9 | 314 | memblock_reserve(__pa(initrd_start), initrd_reserve); |
1da177e4 LT |
315 | } |
316 | } | |
317 | #endif | |
318 | ||
319 | data_resource.start = virt_to_phys(&data_start); | |
c51d476a KM |
320 | data_resource.end = virt_to_phys(_end) - 1; |
321 | code_resource.start = virt_to_phys(_text); | |
1da177e4 LT |
322 | code_resource.end = virt_to_phys(&data_start)-1; |
323 | ||
324 | /* We don't know which region the kernel will be in, so try | |
325 | * all of them. | |
326 | */ | |
327 | for (i = 0; i < sysram_resource_count; i++) { | |
328 | struct resource *res = &sysram_resources[i]; | |
329 | request_resource(res, &code_resource); | |
330 | request_resource(res, &data_resource); | |
331 | } | |
332 | request_resource(&sysram_resources[0], &pdcdata_resource); | |
c9c2877d HD |
333 | |
334 | /* Initialize Page Deallocation Table (PDT) and check for bad memory. */ | |
335 | pdc_pdt_init(); | |
dbdf0760 HD |
336 | |
337 | memblock_allow_resize(); | |
338 | memblock_dump_all(); | |
1da177e4 LT |
339 | } |
340 | ||
8d0e051c | 341 | static bool kernel_set_to_readonly; |
161bd3bf | 342 | |
9129886b JDA |
343 | static void __ref map_pages(unsigned long start_vaddr, |
344 | unsigned long start_paddr, unsigned long size, | |
345 | pgprot_t pgprot, int force) | |
d7dd2ff1 | 346 | { |
d7dd2ff1 JB |
347 | pmd_t *pmd; |
348 | pte_t *pg_table; | |
349 | unsigned long end_paddr; | |
350 | unsigned long start_pmd; | |
351 | unsigned long start_pte; | |
352 | unsigned long tmp1; | |
353 | unsigned long tmp2; | |
354 | unsigned long address; | |
355 | unsigned long vaddr; | |
356 | unsigned long ro_start; | |
357 | unsigned long ro_end; | |
8d0e051c | 358 | unsigned long kernel_start, kernel_end; |
d7dd2ff1 JB |
359 | |
360 | ro_start = __pa((unsigned long)_text); | |
361 | ro_end = __pa((unsigned long)&data_start); | |
8d0e051c | 362 | kernel_start = __pa((unsigned long)&__init_begin); |
41b85a11 | 363 | kernel_end = __pa((unsigned long)&_end); |
d7dd2ff1 JB |
364 | |
365 | end_paddr = start_paddr + size; | |
366 | ||
8121fbc4 | 367 | /* for 2-level configuration PTRS_PER_PMD is 0 so start_pmd will be 0 */ |
d7dd2ff1 | 368 | start_pmd = ((start_vaddr >> PMD_SHIFT) & (PTRS_PER_PMD - 1)); |
d7dd2ff1 JB |
369 | start_pte = ((start_vaddr >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); |
370 | ||
371 | address = start_paddr; | |
372 | vaddr = start_vaddr; | |
373 | while (address < end_paddr) { | |
8121fbc4 MR |
374 | pgd_t *pgd = pgd_offset_k(vaddr); |
375 | p4d_t *p4d = p4d_offset(pgd, vaddr); | |
376 | pud_t *pud = pud_offset(p4d, vaddr); | |
d7dd2ff1 | 377 | |
8121fbc4 MR |
378 | #if CONFIG_PGTABLE_LEVELS == 3 |
379 | if (pud_none(*pud)) { | |
7bf82eb3 MWO |
380 | pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER, |
381 | PAGE_SIZE << PMD_TABLE_ORDER); | |
6a528001 MR |
382 | if (!pmd) |
383 | panic("pmd allocation failed.\n"); | |
8121fbc4 | 384 | pud_populate(NULL, pud, pmd); |
d7dd2ff1 | 385 | } |
d7dd2ff1 | 386 | #endif |
d7dd2ff1 | 387 | |
8121fbc4 | 388 | pmd = pmd_offset(pud, vaddr); |
d7dd2ff1 | 389 | for (tmp1 = start_pmd; tmp1 < PTRS_PER_PMD; tmp1++, pmd++) { |
8121fbc4 MR |
390 | if (pmd_none(*pmd)) { |
391 | pg_table = memblock_alloc(PAGE_SIZE, PAGE_SIZE); | |
6a528001 MR |
392 | if (!pg_table) |
393 | panic("page table allocation failed\n"); | |
8121fbc4 | 394 | pmd_populate_kernel(NULL, pmd, pg_table); |
d7dd2ff1 JB |
395 | } |
396 | ||
8121fbc4 | 397 | pg_table = pte_offset_kernel(pmd, vaddr); |
d7dd2ff1 JB |
398 | for (tmp2 = start_pte; tmp2 < PTRS_PER_PTE; tmp2++, pg_table++) { |
399 | pte_t pte; | |
8d0e051c HD |
400 | pgprot_t prot; |
401 | bool huge = false; | |
402 | ||
403 | if (force) { | |
404 | prot = pgprot; | |
405 | } else if (address < kernel_start || address >= kernel_end) { | |
406 | /* outside kernel memory */ | |
407 | prot = PAGE_KERNEL; | |
408 | } else if (!kernel_set_to_readonly) { | |
409 | /* still initializing, allow writing to RO memory */ | |
410 | prot = PAGE_KERNEL_RWX; | |
411 | huge = true; | |
412 | } else if (address >= ro_start) { | |
413 | /* Code (ro) and Data areas */ | |
414 | prot = (address < ro_end) ? | |
415 | PAGE_KERNEL_EXEC : PAGE_KERNEL; | |
416 | huge = true; | |
417 | } else { | |
418 | prot = PAGE_KERNEL; | |
41b85a11 | 419 | } |
8d0e051c HD |
420 | |
421 | pte = __mk_pte(address, prot); | |
422 | if (huge) | |
41b85a11 | 423 | pte = pte_mkhuge(pte); |
d7dd2ff1 | 424 | |
3c229b3f HD |
425 | if (address >= end_paddr) |
426 | break; | |
d7dd2ff1 JB |
427 | |
428 | set_pte(pg_table, pte); | |
429 | ||
430 | address += PAGE_SIZE; | |
431 | vaddr += PAGE_SIZE; | |
432 | } | |
433 | start_pte = 0; | |
434 | ||
435 | if (address >= end_paddr) | |
436 | break; | |
437 | } | |
438 | start_pmd = 0; | |
439 | } | |
440 | } | |
441 | ||
3847dab7 HD |
442 | void __init set_kernel_text_rw(int enable_read_write) |
443 | { | |
d19a1290 | 444 | unsigned long start = (unsigned long) __init_begin; |
dfbaecb2 | 445 | unsigned long end = (unsigned long) &data_start; |
3847dab7 HD |
446 | |
447 | map_pages(start, __pa(start), end-start, | |
448 | PAGE_KERNEL_RWX, enable_read_write ? 1:0); | |
449 | ||
c9fa406f JDA |
450 | /* force the kernel to see the new page table entries */ |
451 | flush_cache_all(); | |
452 | flush_tlb_all(); | |
3847dab7 HD |
453 | } |
454 | ||
9129886b | 455 | void free_initmem(void) |
1da177e4 | 456 | { |
4fb11781 KM |
457 | unsigned long init_begin = (unsigned long)__init_begin; |
458 | unsigned long init_end = (unsigned long)__init_end; | |
8d0e051c HD |
459 | unsigned long kernel_end = (unsigned long)&_end; |
460 | ||
461 | /* Remap kernel text and data, but do not touch init section yet. */ | |
462 | kernel_set_to_readonly = true; | |
463 | map_pages(init_end, __pa(init_end), kernel_end - init_end, | |
464 | PAGE_KERNEL, 0); | |
1da177e4 | 465 | |
d7dd2ff1 JB |
466 | /* The init text pages are marked R-X. We have to |
467 | * flush the icache and mark them RW- | |
468 | * | |
d7dd2ff1 JB |
469 | * Do a dummy remap of the data section first (the data |
470 | * section is already PAGE_KERNEL) to pull in the TLB entries | |
471 | * for map_kernel */ | |
472 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
473 | PAGE_KERNEL_RWX, 1); | |
474 | /* now remap at PAGE_KERNEL since the TLB is pre-primed to execute | |
475 | * map_pages */ | |
476 | map_pages(init_begin, __pa(init_begin), init_end - init_begin, | |
477 | PAGE_KERNEL, 1); | |
478 | ||
479 | /* force the kernel to see the new TLB entries */ | |
8d0e051c | 480 | __flush_tlb_range(0, init_begin, kernel_end); |
41b85a11 | 481 | |
d7dd2ff1 JB |
482 | /* finally dump all the instructions which were cached, since the |
483 | * pages are no-longer executable */ | |
4fb11781 | 484 | flush_icache_range(init_begin, init_end); |
0cc2dc49 | 485 | |
41b85a11 | 486 | free_initmem_default(POISON_FREE_INITMEM); |
1da177e4 LT |
487 | |
488 | /* set up a new led state on systems shipped LED State panel */ | |
489 | pdc_chassis_send_status(PDC_CHASSIS_DIRECT_BCOMPLETE); | |
1da177e4 LT |
490 | } |
491 | ||
1bcdd854 | 492 | |
0f5bf6d0 | 493 | #ifdef CONFIG_STRICT_KERNEL_RWX |
1bcdd854 HD |
494 | void mark_rodata_ro(void) |
495 | { | |
1bcdd854 HD |
496 | /* rodata memory was already mapped with KERNEL_RO access rights by |
497 | pagetable_init() and map_pages(). No need to do additional stuff here */ | |
8d0e051c HD |
498 | unsigned long roai_size = __end_ro_after_init - __start_ro_after_init; |
499 | ||
500 | pr_info("Write protected read-only-after-init data: %luk\n", roai_size >> 10); | |
1bcdd854 HD |
501 | } |
502 | #endif | |
503 | ||
504 | ||
1da177e4 LT |
505 | /* |
506 | * Just an arbitrary offset to serve as a "hole" between mapping areas | |
507 | * (between top of physical memory and a potential pcxl dma mapping | |
508 | * area, and below the vmalloc mapping area). | |
509 | * | |
510 | * The current 32K value just means that there will be a 32K "hole" | |
511 | * between mapping areas. That means that any out-of-bounds memory | |
512 | * accesses will hopefully be caught. The vmalloc() routines leaves | |
513 | * a hole of 4kB between each vmalloced area for the same reason. | |
514 | */ | |
515 | ||
516 | /* Leave room for gateway page expansion */ | |
517 | #if KERNEL_MAP_START < GATEWAY_PAGE_SIZE | |
518 | #error KERNEL_MAP_START is in gateway reserved region | |
519 | #endif | |
520 | #define MAP_START (KERNEL_MAP_START) | |
521 | ||
522 | #define VM_MAP_OFFSET (32*1024) | |
523 | #define SET_MAP_OFFSET(x) ((void *)(((unsigned long)(x) + VM_MAP_OFFSET) \ | |
524 | & ~(VM_MAP_OFFSET-1))) | |
525 | ||
4e617c86 | 526 | void *parisc_vmalloc_start __ro_after_init; |
4255f0d2 | 527 | EXPORT_SYMBOL(parisc_vmalloc_start); |
1da177e4 | 528 | |
1da177e4 LT |
529 | void __init mem_init(void) |
530 | { | |
d0cf62fb HD |
531 | /* Do sanity checks on IPC (compat) structures */ |
532 | BUILD_BUG_ON(sizeof(struct ipc64_perm) != 48); | |
533 | #ifndef CONFIG_64BIT | |
534 | BUILD_BUG_ON(sizeof(struct semid64_ds) != 80); | |
535 | BUILD_BUG_ON(sizeof(struct msqid64_ds) != 104); | |
536 | BUILD_BUG_ON(sizeof(struct shmid64_ds) != 104); | |
537 | #endif | |
538 | #ifdef CONFIG_COMPAT | |
539 | BUILD_BUG_ON(sizeof(struct compat_ipc64_perm) != sizeof(struct ipc64_perm)); | |
540 | BUILD_BUG_ON(sizeof(struct compat_semid64_ds) != 80); | |
541 | BUILD_BUG_ON(sizeof(struct compat_msqid64_ds) != 104); | |
542 | BUILD_BUG_ON(sizeof(struct compat_shmid64_ds) != 104); | |
543 | #endif | |
544 | ||
48d27cb2 HD |
545 | /* Do sanity checks on page table constants */ |
546 | BUILD_BUG_ON(PTE_ENTRY_SIZE != sizeof(pte_t)); | |
547 | BUILD_BUG_ON(PMD_ENTRY_SIZE != sizeof(pmd_t)); | |
548 | BUILD_BUG_ON(PGD_ENTRY_SIZE != sizeof(pgd_t)); | |
549 | BUILD_BUG_ON(PAGE_SHIFT + BITS_PER_PTE + BITS_PER_PMD + BITS_PER_PGD | |
550 | > BITS_PER_LONG); | |
b7795074 HD |
551 | #if CONFIG_PGTABLE_LEVELS == 3 |
552 | BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PMD); | |
553 | #else | |
554 | BUILD_BUG_ON(PT_INITIAL > PTRS_PER_PGD); | |
555 | #endif | |
48d27cb2 | 556 | |
44eeb9b5 HD |
557 | #ifdef CONFIG_64BIT |
558 | /* avoid ldil_%L() asm statements to sign-extend into upper 32-bits */ | |
559 | BUILD_BUG_ON(__PAGE_OFFSET >= 0x80000000); | |
560 | BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000); | |
561 | #endif | |
562 | ||
1da177e4 | 563 | high_memory = __va((max_pfn << PAGE_SHIFT)); |
bf71bc16 | 564 | set_max_mapnr(max_low_pfn); |
c6ffc5ca | 565 | memblock_free_all(); |
1da177e4 | 566 | |
1da177e4 | 567 | #ifdef CONFIG_PA11 |
a34a9b96 | 568 | if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) { |
1da177e4 | 569 | pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START); |
4255f0d2 HD |
570 | parisc_vmalloc_start = SET_MAP_OFFSET(pcxl_dma_start |
571 | + PCXL_DMA_MAP_SIZE); | |
a34a9b96 | 572 | } else |
1da177e4 | 573 | #endif |
a34a9b96 | 574 | parisc_vmalloc_start = SET_MAP_OFFSET(MAP_START); |
1da177e4 | 575 | |
fd8d0ca2 HD |
576 | #if 0 |
577 | /* | |
578 | * Do not expose the virtual kernel memory layout to userspace. | |
579 | * But keep code for debugging purposes. | |
580 | */ | |
ce8420bb | 581 | printk("virtual kernel memory layout:\n" |
ccfbc68d SS |
582 | " vmalloc : 0x%px - 0x%px (%4ld MB)\n" |
583 | " fixmap : 0x%px - 0x%px (%4ld kB)\n" | |
584 | " memory : 0x%px - 0x%px (%4ld MB)\n" | |
585 | " .init : 0x%px - 0x%px (%4ld kB)\n" | |
586 | " .data : 0x%px - 0x%px (%4ld kB)\n" | |
587 | " .text : 0x%px - 0x%px (%4ld kB)\n", | |
ce8420bb HD |
588 | |
589 | (void*)VMALLOC_START, (void*)VMALLOC_END, | |
590 | (VMALLOC_END - VMALLOC_START) >> 20, | |
591 | ||
ccfbc68d SS |
592 | (void *)FIXMAP_START, (void *)(FIXMAP_START + FIXMAP_SIZE), |
593 | (unsigned long)(FIXMAP_SIZE / 1024), | |
594 | ||
ce8420bb HD |
595 | __va(0), high_memory, |
596 | ((unsigned long)high_memory - (unsigned long)__va(0)) >> 20, | |
597 | ||
53faf291 KM |
598 | __init_begin, __init_end, |
599 | ((unsigned long)__init_end - (unsigned long)__init_begin) >> 10, | |
ce8420bb | 600 | |
53faf291 KM |
601 | _etext, _edata, |
602 | ((unsigned long)_edata - (unsigned long)_etext) >> 10, | |
ce8420bb | 603 | |
53faf291 KM |
604 | _text, _etext, |
605 | ((unsigned long)_etext - (unsigned long)_text) >> 10); | |
ce8420bb | 606 | #endif |
1da177e4 LT |
607 | } |
608 | ||
4e617c86 | 609 | unsigned long *empty_zero_page __ro_after_init; |
22febf1f | 610 | EXPORT_SYMBOL(empty_zero_page); |
1da177e4 | 611 | |
1da177e4 LT |
612 | /* |
613 | * pagetable_init() sets up the page tables | |
614 | * | |
615 | * Note that gateway_init() places the Linux gateway page at page 0. | |
616 | * Since gateway pages cannot be dereferenced this has the desirable | |
617 | * side effect of trapping those pesky NULL-reference errors in the | |
618 | * kernel. | |
619 | */ | |
620 | static void __init pagetable_init(void) | |
621 | { | |
622 | int range; | |
623 | ||
624 | /* Map each physical memory range to its kernel vaddr */ | |
625 | ||
626 | for (range = 0; range < npmem_ranges; range++) { | |
627 | unsigned long start_paddr; | |
1da177e4 LT |
628 | unsigned long size; |
629 | ||
630 | start_paddr = pmem_ranges[range].start_pfn << PAGE_SHIFT; | |
1da177e4 LT |
631 | size = pmem_ranges[range].pages << PAGE_SHIFT; |
632 | ||
633 | map_pages((unsigned long)__va(start_paddr), start_paddr, | |
d7dd2ff1 | 634 | size, PAGE_KERNEL, 0); |
1da177e4 LT |
635 | } |
636 | ||
637 | #ifdef CONFIG_BLK_DEV_INITRD | |
638 | if (initrd_end && initrd_end > mem_limit) { | |
1bcdd854 | 639 | printk(KERN_INFO "initrd: mapping %08lx-%08lx\n", initrd_start, initrd_end); |
1da177e4 | 640 | map_pages(initrd_start, __pa(initrd_start), |
d7dd2ff1 | 641 | initrd_end - initrd_start, PAGE_KERNEL, 0); |
1da177e4 LT |
642 | } |
643 | #endif | |
644 | ||
6a528001 MR |
645 | empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
646 | if (!empty_zero_page) | |
647 | panic("zero page allocation failed.\n"); | |
648 | ||
1da177e4 LT |
649 | } |
650 | ||
651 | static void __init gateway_init(void) | |
652 | { | |
653 | unsigned long linux_gateway_page_addr; | |
654 | /* FIXME: This is 'const' in order to trick the compiler | |
655 | into not treating it as DP-relative data. */ | |
656 | extern void * const linux_gateway_page; | |
657 | ||
658 | linux_gateway_page_addr = LINUX_GATEWAY_ADDR & PAGE_MASK; | |
659 | ||
660 | /* | |
661 | * Setup Linux Gateway page. | |
662 | * | |
663 | * The Linux gateway page will reside in kernel space (on virtual | |
664 | * page 0), so it doesn't need to be aliased into user space. | |
665 | */ | |
666 | ||
667 | map_pages(linux_gateway_page_addr, __pa(&linux_gateway_page), | |
d7dd2ff1 | 668 | PAGE_SIZE, PAGE_GATEWAY, 1); |
1da177e4 LT |
669 | } |
670 | ||
c2ff2b73 MRI |
671 | static void __init fixmap_init(void) |
672 | { | |
673 | unsigned long addr = FIXMAP_START; | |
674 | unsigned long end = FIXMAP_START + FIXMAP_SIZE; | |
675 | pgd_t *pgd = pgd_offset_k(addr); | |
676 | p4d_t *p4d = p4d_offset(pgd, addr); | |
677 | pud_t *pud = pud_offset(p4d, addr); | |
678 | pmd_t *pmd; | |
679 | ||
680 | BUILD_BUG_ON(FIXMAP_SIZE > PMD_SIZE); | |
681 | ||
682 | #if CONFIG_PGTABLE_LEVELS == 3 | |
683 | if (pud_none(*pud)) { | |
684 | pmd = memblock_alloc(PAGE_SIZE << PMD_TABLE_ORDER, | |
685 | PAGE_SIZE << PMD_TABLE_ORDER); | |
686 | if (!pmd) | |
687 | panic("fixmap: pmd allocation failed.\n"); | |
688 | pud_populate(NULL, pud, pmd); | |
689 | } | |
690 | #endif | |
691 | ||
692 | pmd = pmd_offset(pud, addr); | |
693 | do { | |
694 | pte_t *pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); | |
695 | if (!pte) | |
696 | panic("fixmap: pte allocation failed.\n"); | |
697 | ||
698 | pmd_populate_kernel(&init_mm, pmd, pte); | |
699 | ||
700 | addr += PAGE_SIZE; | |
701 | } while (addr < end); | |
702 | } | |
703 | ||
dbdf0760 | 704 | static void __init parisc_bootmem_free(void) |
1da177e4 | 705 | { |
625bf73e | 706 | unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, }; |
1da177e4 | 707 | |
625bf73e | 708 | max_zone_pfn[0] = memblock_end_of_DRAM(); |
dbdf0760 | 709 | |
625bf73e | 710 | free_area_init(max_zone_pfn); |
dbdf0760 HD |
711 | } |
712 | ||
713 | void __init paging_init(void) | |
714 | { | |
1da177e4 LT |
715 | setup_bootmem(); |
716 | pagetable_init(); | |
717 | gateway_init(); | |
c2ff2b73 | 718 | fixmap_init(); |
1da177e4 | 719 | flush_cache_all_local(); /* start with known state */ |
ce33941f | 720 | flush_tlb_all_local(NULL); |
1da177e4 | 721 | |
dbdf0760 HD |
722 | sparse_init(); |
723 | parisc_bootmem_free(); | |
1da177e4 LT |
724 | } |
725 | ||
e5ef93d0 HD |
726 | static void alloc_btlb(unsigned long start, unsigned long end, int *slot, |
727 | unsigned long entry_info) | |
728 | { | |
729 | const int slot_max = btlb_info.fixed_range_info.num_comb; | |
730 | int min_num_pages = btlb_info.min_size; | |
731 | unsigned long size; | |
732 | ||
733 | /* map at minimum 4 pages */ | |
734 | if (min_num_pages < 4) | |
735 | min_num_pages = 4; | |
736 | ||
737 | size = HUGEPAGE_SIZE; | |
738 | while (start < end && *slot < slot_max && size >= PAGE_SIZE) { | |
739 | /* starting address must have same alignment as size! */ | |
740 | /* if correctly aligned and fits in double size, increase */ | |
741 | if (((start & (2 * size - 1)) == 0) && | |
742 | (end - start) >= (2 * size)) { | |
743 | size <<= 1; | |
744 | continue; | |
745 | } | |
746 | /* if current size alignment is too big, try smaller size */ | |
747 | if ((start & (size - 1)) != 0) { | |
748 | size >>= 1; | |
749 | continue; | |
750 | } | |
751 | if ((end - start) >= size) { | |
752 | if ((size >> PAGE_SHIFT) >= min_num_pages) | |
753 | pdc_btlb_insert(start >> PAGE_SHIFT, __pa(start) >> PAGE_SHIFT, | |
754 | size >> PAGE_SHIFT, entry_info, *slot); | |
755 | (*slot)++; | |
756 | start += size; | |
757 | continue; | |
758 | } | |
759 | size /= 2; | |
760 | continue; | |
761 | } | |
762 | } | |
763 | ||
764 | void btlb_init_per_cpu(void) | |
765 | { | |
766 | unsigned long s, t, e; | |
767 | int slot; | |
768 | ||
769 | /* BTLBs are not available on 64-bit CPUs */ | |
770 | if (IS_ENABLED(CONFIG_PA20)) | |
771 | return; | |
772 | else if (pdc_btlb_info(&btlb_info) < 0) { | |
773 | memset(&btlb_info, 0, sizeof btlb_info); | |
774 | } | |
775 | ||
776 | /* insert BLTLBs for code and data segments */ | |
777 | s = (uintptr_t) dereference_function_descriptor(&_stext); | |
778 | e = (uintptr_t) dereference_function_descriptor(&_etext); | |
779 | t = (uintptr_t) dereference_function_descriptor(&_sdata); | |
780 | BUG_ON(t != e); | |
781 | ||
782 | /* code segments */ | |
783 | slot = 0; | |
784 | alloc_btlb(s, e, &slot, 0x13800000); | |
785 | ||
786 | /* sanity check */ | |
787 | t = (uintptr_t) dereference_function_descriptor(&_edata); | |
788 | e = (uintptr_t) dereference_function_descriptor(&__bss_start); | |
789 | BUG_ON(t != e); | |
790 | ||
791 | /* data segments */ | |
792 | s = (uintptr_t) dereference_function_descriptor(&_sdata); | |
793 | e = (uintptr_t) dereference_function_descriptor(&__bss_stop); | |
794 | alloc_btlb(s, e, &slot, 0x11800000); | |
795 | } | |
796 | ||
1da177e4 LT |
797 | #ifdef CONFIG_PA20 |
798 | ||
799 | /* | |
7022672e | 800 | * Currently, all PA20 chips have 18 bit protection IDs, which is the |
1da177e4 LT |
801 | * limiting factor (space ids are 32 bits). |
802 | */ | |
803 | ||
804 | #define NR_SPACE_IDS 262144 | |
805 | ||
806 | #else | |
807 | ||
808 | /* | |
7022672e SA |
809 | * Currently we have a one-to-one relationship between space IDs and |
810 | * protection IDs. Older parisc chips (PCXS, PCXT, PCXL, PCXL2) only | |
811 | * support 15 bit protection IDs, so that is the limiting factor. | |
812 | * PCXT' has 18 bit protection IDs, but only 16 bit spaceids, so it's | |
1da177e4 LT |
813 | * probably not worth the effort for a special case here. |
814 | */ | |
815 | ||
816 | #define NR_SPACE_IDS 32768 | |
817 | ||
818 | #endif /* !CONFIG_PA20 */ | |
819 | ||
820 | #define RECYCLE_THRESHOLD (NR_SPACE_IDS / 2) | |
821 | #define SID_ARRAY_SIZE (NR_SPACE_IDS / (8 * sizeof(long))) | |
822 | ||
823 | static unsigned long space_id[SID_ARRAY_SIZE] = { 1 }; /* disallow space 0 */ | |
824 | static unsigned long dirty_space_id[SID_ARRAY_SIZE]; | |
825 | static unsigned long space_id_index; | |
826 | static unsigned long free_space_ids = NR_SPACE_IDS - 1; | |
cbe263b6 | 827 | static unsigned long dirty_space_ids; |
1da177e4 LT |
828 | |
829 | static DEFINE_SPINLOCK(sid_lock); | |
830 | ||
831 | unsigned long alloc_sid(void) | |
832 | { | |
833 | unsigned long index; | |
834 | ||
835 | spin_lock(&sid_lock); | |
836 | ||
837 | if (free_space_ids == 0) { | |
838 | if (dirty_space_ids != 0) { | |
839 | spin_unlock(&sid_lock); | |
840 | flush_tlb_all(); /* flush_tlb_all() calls recycle_sids() */ | |
841 | spin_lock(&sid_lock); | |
842 | } | |
2fd83038 | 843 | BUG_ON(free_space_ids == 0); |
1da177e4 LT |
844 | } |
845 | ||
846 | free_space_ids--; | |
847 | ||
848 | index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index); | |
208151bf | 849 | space_id[BIT_WORD(index)] |= BIT_MASK(index); |
1da177e4 LT |
850 | space_id_index = index; |
851 | ||
852 | spin_unlock(&sid_lock); | |
853 | ||
854 | return index << SPACEID_SHIFT; | |
855 | } | |
856 | ||
857 | void free_sid(unsigned long spaceid) | |
858 | { | |
859 | unsigned long index = spaceid >> SPACEID_SHIFT; | |
208151bf | 860 | unsigned long *dirty_space_offset, mask; |
1da177e4 | 861 | |
208151bf HD |
862 | dirty_space_offset = &dirty_space_id[BIT_WORD(index)]; |
863 | mask = BIT_MASK(index); | |
1da177e4 LT |
864 | |
865 | spin_lock(&sid_lock); | |
866 | ||
208151bf | 867 | BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */ |
1da177e4 | 868 | |
208151bf | 869 | *dirty_space_offset |= mask; |
1da177e4 LT |
870 | dirty_space_ids++; |
871 | ||
872 | spin_unlock(&sid_lock); | |
873 | } | |
874 | ||
875 | ||
876 | #ifdef CONFIG_SMP | |
877 | static void get_dirty_sids(unsigned long *ndirtyptr,unsigned long *dirty_array) | |
878 | { | |
879 | int i; | |
880 | ||
881 | /* NOTE: sid_lock must be held upon entry */ | |
882 | ||
883 | *ndirtyptr = dirty_space_ids; | |
884 | if (dirty_space_ids != 0) { | |
885 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
886 | dirty_array[i] = dirty_space_id[i]; | |
887 | dirty_space_id[i] = 0; | |
888 | } | |
889 | dirty_space_ids = 0; | |
890 | } | |
891 | ||
892 | return; | |
893 | } | |
894 | ||
895 | static void recycle_sids(unsigned long ndirty,unsigned long *dirty_array) | |
896 | { | |
897 | int i; | |
898 | ||
899 | /* NOTE: sid_lock must be held upon entry */ | |
900 | ||
901 | if (ndirty != 0) { | |
902 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
903 | space_id[i] ^= dirty_array[i]; | |
904 | } | |
905 | ||
906 | free_space_ids += ndirty; | |
907 | space_id_index = 0; | |
908 | } | |
909 | } | |
910 | ||
911 | #else /* CONFIG_SMP */ | |
912 | ||
913 | static void recycle_sids(void) | |
914 | { | |
915 | int i; | |
916 | ||
917 | /* NOTE: sid_lock must be held upon entry */ | |
918 | ||
919 | if (dirty_space_ids != 0) { | |
920 | for (i = 0; i < SID_ARRAY_SIZE; i++) { | |
921 | space_id[i] ^= dirty_space_id[i]; | |
922 | dirty_space_id[i] = 0; | |
923 | } | |
924 | ||
925 | free_space_ids += dirty_space_ids; | |
926 | dirty_space_ids = 0; | |
927 | space_id_index = 0; | |
928 | } | |
929 | } | |
930 | #endif | |
931 | ||
932 | /* | |
933 | * flush_tlb_all() calls recycle_sids(), since whenever the entire tlb is | |
934 | * purged, we can safely reuse the space ids that were released but | |
935 | * not flushed from the tlb. | |
936 | */ | |
937 | ||
938 | #ifdef CONFIG_SMP | |
939 | ||
940 | static unsigned long recycle_ndirty; | |
941 | static unsigned long recycle_dirty_array[SID_ARRAY_SIZE]; | |
2fd83038 | 942 | static unsigned int recycle_inuse; |
1da177e4 LT |
943 | |
944 | void flush_tlb_all(void) | |
945 | { | |
946 | int do_recycle; | |
947 | ||
948 | do_recycle = 0; | |
949 | spin_lock(&sid_lock); | |
1030d681 | 950 | __inc_irq_stat(irq_tlb_count); |
1da177e4 | 951 | if (dirty_space_ids > RECYCLE_THRESHOLD) { |
2fd83038 | 952 | BUG_ON(recycle_inuse); /* FIXME: Use a semaphore/wait queue here */ |
1da177e4 LT |
953 | get_dirty_sids(&recycle_ndirty,recycle_dirty_array); |
954 | recycle_inuse++; | |
955 | do_recycle++; | |
956 | } | |
957 | spin_unlock(&sid_lock); | |
15c8b6c1 | 958 | on_each_cpu(flush_tlb_all_local, NULL, 1); |
1da177e4 LT |
959 | if (do_recycle) { |
960 | spin_lock(&sid_lock); | |
961 | recycle_sids(recycle_ndirty,recycle_dirty_array); | |
962 | recycle_inuse = 0; | |
963 | spin_unlock(&sid_lock); | |
964 | } | |
965 | } | |
966 | #else | |
967 | void flush_tlb_all(void) | |
968 | { | |
969 | spin_lock(&sid_lock); | |
1030d681 | 970 | __inc_irq_stat(irq_tlb_count); |
1b2425e3 | 971 | flush_tlb_all_local(NULL); |
1da177e4 LT |
972 | recycle_sids(); |
973 | spin_unlock(&sid_lock); | |
974 | } | |
975 | #endif | |
252358f1 AK |
976 | |
977 | static const pgprot_t protection_map[16] = { | |
978 | [VM_NONE] = PAGE_NONE, | |
979 | [VM_READ] = PAGE_READONLY, | |
980 | [VM_WRITE] = PAGE_NONE, | |
981 | [VM_WRITE | VM_READ] = PAGE_READONLY, | |
982 | [VM_EXEC] = PAGE_EXECREAD, | |
983 | [VM_EXEC | VM_READ] = PAGE_EXECREAD, | |
984 | [VM_EXEC | VM_WRITE] = PAGE_EXECREAD, | |
985 | [VM_EXEC | VM_WRITE | VM_READ] = PAGE_EXECREAD, | |
986 | [VM_SHARED] = PAGE_NONE, | |
987 | [VM_SHARED | VM_READ] = PAGE_READONLY, | |
988 | [VM_SHARED | VM_WRITE] = PAGE_WRITEONLY, | |
989 | [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, | |
990 | [VM_SHARED | VM_EXEC] = PAGE_EXECREAD, | |
991 | [VM_SHARED | VM_EXEC | VM_READ] = PAGE_EXECREAD, | |
992 | [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_RWX, | |
993 | [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_RWX | |
994 | }; | |
995 | DECLARE_VM_GET_PAGE_PROT | |
0cc2dc49 MRI |
996 | |
997 | #ifdef CONFIG_EXECMEM | |
998 | static struct execmem_info execmem_info __ro_after_init; | |
999 | ||
1000 | struct execmem_info __init *execmem_arch_setup(void) | |
1001 | { | |
1002 | execmem_info = (struct execmem_info){ | |
1003 | .ranges = { | |
1004 | [EXECMEM_DEFAULT] = { | |
1005 | .start = VMALLOC_START, | |
1006 | .end = VMALLOC_END, | |
1007 | .pgprot = PAGE_KERNEL_RWX, | |
1008 | .alignment = 1, | |
1009 | }, | |
1010 | }, | |
1011 | }; | |
1012 | ||
1013 | return &execmem_info; | |
1014 | } | |
1015 | #endif /* CONFIG_EXECMEM */ |