1 /* 1 /*
2 * Copyright (C) 2013 Altera Corporation <<
3 * Copyright (C) 2010 Tobias Klauser <tklauser <<
4 * Copyright (C) 2009 Wind River Systems Inc <<
5 * Implemented by fredrik.markstrom@gmail.co <<
6 * Copyright (C) 2004 Microtronix Datacom Ltd <<
7 * <<
8 * based on arch/m68k/mm/init.c <<
9 * <<
10 * This file is subject to the terms and condi 2 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file "COPYING" in the main !! 3 * License. See the file "COPYING" in the main directory of this archive
12 * for more details. 4 * for more details.
>> 5 *
>> 6 * Copyright (C) 1994 - 2000 Ralf Baechle
>> 7 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
>> 8 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
>> 9 * Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
13 */ 10 */
14 !! 11 #include <linux/bug.h>
>> 12 #include <linux/init.h>
>> 13 #include <linux/export.h>
15 #include <linux/signal.h> 14 #include <linux/signal.h>
16 #include <linux/sched.h> 15 #include <linux/sched.h>
>> 16 #include <linux/smp.h>
17 #include <linux/kernel.h> 17 #include <linux/kernel.h>
18 #include <linux/errno.h> 18 #include <linux/errno.h>
19 #include <linux/string.h> 19 #include <linux/string.h>
20 #include <linux/types.h> 20 #include <linux/types.h>
>> 21 #include <linux/pagemap.h>
21 #include <linux/ptrace.h> 22 #include <linux/ptrace.h>
22 #include <linux/mman.h> 23 #include <linux/mman.h>
23 #include <linux/mm.h> 24 #include <linux/mm.h>
24 #include <linux/init.h> <<
25 #include <linux/pagemap.h> <<
26 #include <linux/memblock.h> 25 #include <linux/memblock.h>
27 #include <linux/slab.h> !! 26 #include <linux/highmem.h>
28 #include <linux/binfmts.h> !! 27 #include <linux/swap.h>
>> 28 #include <linux/proc_fs.h>
>> 29 #include <linux/pfn.h>
>> 30 #include <linux/hardirq.h>
>> 31 #include <linux/gfp.h>
>> 32 #include <linux/kcore.h>
>> 33 #include <linux/initrd.h>
29 #include <linux/execmem.h> 34 #include <linux/execmem.h>
30 35
31 #include <asm/setup.h> !! 36 #include <asm/bootinfo.h>
32 #include <asm/page.h> !! 37 #include <asm/cachectl.h>
>> 38 #include <asm/cpu.h>
>> 39 #include <asm/dma.h>
>> 40 #include <asm/maar.h>
>> 41 #include <asm/mmu_context.h>
>> 42 #include <asm/mmzone.h>
33 #include <asm/sections.h> 43 #include <asm/sections.h>
>> 44 #include <asm/pgalloc.h>
34 #include <asm/tlb.h> 45 #include <asm/tlb.h>
35 #include <asm/mmu_context.h> !! 46 #include <asm/fixmap.h>
36 #include <asm/cpuinfo.h> <<
37 #include <asm/processor.h> <<
38 47
39 pgd_t *pgd_current; !! 48 /*
>> 49 * We have up to 8 empty zeroed pages so we can map one of the right colour
>> 50 * when needed. This is necessary only on R4000 / R4400 SC and MC versions
>> 51 * where we have to avoid VCED / VECI exceptions for good performance at
>> 52 * any price. Since page is never written to after the initialization we
>> 53 * don't have to care about aliases on other CPUs.
>> 54 */
>> 55 unsigned long empty_zero_page, zero_page_mask;
>> 56 EXPORT_SYMBOL_GPL(empty_zero_page);
>> 57 EXPORT_SYMBOL(zero_page_mask);
40 58
41 /* 59 /*
42 * paging_init() continues the virtual memory !! 60 * Not static inline because used by IP27 special magic initialization code
43 * was begun by the code in arch/head.S. <<
44 * The parameters are pointers to where to sti <<
45 * addresses of available kernel virtual memor <<
46 */ 61 */
47 void __init paging_init(void) !! 62 void setup_zero_pages(void)
48 { 63 {
49 unsigned long max_zone_pfn[MAX_NR_ZONE !! 64 unsigned int order, i;
>> 65 struct page *page;
50 66
51 pagetable_init(); !! 67 if (cpu_has_vce)
52 pgd_current = swapper_pg_dir; !! 68 order = 3;
>> 69 else
>> 70 order = 0;
>> 71
>> 72 empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
>> 73 if (!empty_zero_page)
>> 74 panic("Oh boy, that early out of memory?");
>> 75
>> 76 page = virt_to_page((void *)empty_zero_page);
>> 77 split_page(page, order);
>> 78 for (i = 0; i < (1 << order); i++, page++)
>> 79 mark_page_reserved(page);
>> 80
>> 81 zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
>> 82 }
53 83
54 max_zone_pfn[ZONE_NORMAL] = max_mapnr; !! 84 static void *__kmap_pgprot(struct page *page, unsigned long addr, pgprot_t prot)
>> 85 {
>> 86 enum fixed_addresses idx;
>> 87 unsigned int old_mmid;
>> 88 unsigned long vaddr, flags, entrylo;
>> 89 unsigned long old_ctx;
>> 90 pte_t pte;
>> 91 int tlbidx;
>> 92
>> 93 BUG_ON(folio_test_dcache_dirty(page_folio(page)));
>> 94
>> 95 preempt_disable();
>> 96 pagefault_disable();
>> 97 idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
>> 98 idx += in_interrupt() ? FIX_N_COLOURS : 0;
>> 99 vaddr = __fix_to_virt(FIX_CMAP_END - idx);
>> 100 pte = mk_pte(page, prot);
>> 101 #if defined(CONFIG_XPA)
>> 102 entrylo = pte_to_entrylo(pte.pte_high);
>> 103 #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
>> 104 entrylo = pte.pte_high;
>> 105 #else
>> 106 entrylo = pte_to_entrylo(pte_val(pte));
>> 107 #endif
>> 108
>> 109 local_irq_save(flags);
>> 110 old_ctx = read_c0_entryhi();
>> 111 write_c0_entryhi(vaddr & (PAGE_MASK << 1));
>> 112 write_c0_entrylo0(entrylo);
>> 113 write_c0_entrylo1(entrylo);
>> 114 if (cpu_has_mmid) {
>> 115 old_mmid = read_c0_memorymapid();
>> 116 write_c0_memorymapid(MMID_KERNEL_WIRED);
>> 117 }
>> 118 #ifdef CONFIG_XPA
>> 119 if (cpu_has_xpa) {
>> 120 entrylo = (pte.pte_low & _PFNX_MASK);
>> 121 writex_c0_entrylo0(entrylo);
>> 122 writex_c0_entrylo1(entrylo);
>> 123 }
>> 124 #endif
>> 125 tlbidx = num_wired_entries();
>> 126 write_c0_wired(tlbidx + 1);
>> 127 write_c0_index(tlbidx);
>> 128 mtc0_tlbw_hazard();
>> 129 tlb_write_indexed();
>> 130 tlbw_use_hazard();
>> 131 write_c0_entryhi(old_ctx);
>> 132 if (cpu_has_mmid)
>> 133 write_c0_memorymapid(old_mmid);
>> 134 local_irq_restore(flags);
55 135
56 /* pass the memory from the bootmem al !! 136 return (void*) vaddr;
57 free_area_init(max_zone_pfn); !! 137 }
58 138
59 flush_dcache_range((unsigned long)empt !! 139 void *kmap_coherent(struct page *page, unsigned long addr)
60 (unsigned long)empty_z !! 140 {
>> 141 return __kmap_pgprot(page, addr, PAGE_KERNEL);
61 } 142 }
62 143
63 void __init mem_init(void) !! 144 void *kmap_noncoherent(struct page *page, unsigned long addr)
64 { 145 {
65 unsigned long end_mem = memory_end; !! 146 return __kmap_pgprot(page, addr, PAGE_KERNEL_NC);
66 !! 147 }
67 148
68 pr_debug("mem_init: start=%lx, end=%lx !! 149 void kunmap_coherent(void)
>> 150 {
>> 151 unsigned int wired;
>> 152 unsigned long flags, old_ctx;
69 153
70 end_mem &= PAGE_MASK; !! 154 local_irq_save(flags);
71 high_memory = __va(end_mem); !! 155 old_ctx = read_c0_entryhi();
>> 156 wired = num_wired_entries() - 1;
>> 157 write_c0_wired(wired);
>> 158 write_c0_index(wired);
>> 159 write_c0_entryhi(UNIQUE_ENTRYHI(wired));
>> 160 write_c0_entrylo0(0);
>> 161 write_c0_entrylo1(0);
>> 162 mtc0_tlbw_hazard();
>> 163 tlb_write_indexed();
>> 164 tlbw_use_hazard();
>> 165 write_c0_entryhi(old_ctx);
>> 166 local_irq_restore(flags);
>> 167 pagefault_enable();
>> 168 preempt_enable();
>> 169 }
72 170
73 /* this will put all memory onto the f !! 171 void copy_user_highpage(struct page *to, struct page *from,
74 memblock_free_all(); !! 172 unsigned long vaddr, struct vm_area_struct *vma)
>> 173 {
>> 174 struct folio *src = page_folio(from);
>> 175 void *vfrom, *vto;
>> 176
>> 177 vto = kmap_atomic(to);
>> 178 if (cpu_has_dc_aliases &&
>> 179 folio_mapped(src) && !folio_test_dcache_dirty(src)) {
>> 180 vfrom = kmap_coherent(from, vaddr);
>> 181 copy_page(vto, vfrom);
>> 182 kunmap_coherent();
>> 183 } else {
>> 184 vfrom = kmap_atomic(from);
>> 185 copy_page(vto, vfrom);
>> 186 kunmap_atomic(vfrom);
>> 187 }
>> 188 if ((!cpu_has_ic_fills_f_dc) ||
>> 189 pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
>> 190 flush_data_cache_page((unsigned long)vto);
>> 191 kunmap_atomic(vto);
>> 192 /* Make sure this page is cleared on other CPU's too before using it */
>> 193 smp_wmb();
>> 194 }
>> 195
>> 196 void copy_to_user_page(struct vm_area_struct *vma,
>> 197 struct page *page, unsigned long vaddr, void *dst, const void *src,
>> 198 unsigned long len)
>> 199 {
>> 200 struct folio *folio = page_folio(page);
>> 201
>> 202 if (cpu_has_dc_aliases &&
>> 203 folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
>> 204 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
>> 205 memcpy(vto, src, len);
>> 206 kunmap_coherent();
>> 207 } else {
>> 208 memcpy(dst, src, len);
>> 209 if (cpu_has_dc_aliases)
>> 210 folio_set_dcache_dirty(folio);
>> 211 }
>> 212 if (vma->vm_flags & VM_EXEC)
>> 213 flush_cache_page(vma, vaddr, page_to_pfn(page));
75 } 214 }
76 215
77 void __init mmu_init(void) !! 216 void copy_from_user_page(struct vm_area_struct *vma,
>> 217 struct page *page, unsigned long vaddr, void *dst, const void *src,
>> 218 unsigned long len)
78 { 219 {
79 flush_tlb_all(); !! 220 struct folio *folio = page_folio(page);
>> 221
>> 222 if (cpu_has_dc_aliases &&
>> 223 folio_mapped(folio) && !folio_test_dcache_dirty(folio)) {
>> 224 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
>> 225 memcpy(dst, vfrom, len);
>> 226 kunmap_coherent();
>> 227 } else {
>> 228 memcpy(dst, src, len);
>> 229 if (cpu_has_dc_aliases)
>> 230 folio_set_dcache_dirty(folio);
>> 231 }
80 } 232 }
>> 233 EXPORT_SYMBOL_GPL(copy_from_user_page);
81 234
82 pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(P !! 235 void __init fixrange_init(unsigned long start, unsigned long end,
83 pte_t invalid_pte_table[PTRS_PER_PTE] __aligne !! 236 pgd_t *pgd_base)
84 static struct page *kuser_page[1]; !! 237 {
85 static struct vm_special_mapping vdso_mapping !! 238 #ifdef CONFIG_HIGHMEM
86 .name = "[vdso]", !! 239 pgd_t *pgd;
87 .pages = kuser_page, !! 240 pud_t *pud;
>> 241 pmd_t *pmd;
>> 242 pte_t *pte;
>> 243 int i, j, k;
>> 244 unsigned long vaddr;
>> 245
>> 246 vaddr = start;
>> 247 i = pgd_index(vaddr);
>> 248 j = pud_index(vaddr);
>> 249 k = pmd_index(vaddr);
>> 250 pgd = pgd_base + i;
>> 251
>> 252 for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
>> 253 pud = (pud_t *)pgd;
>> 254 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
>> 255 pmd = (pmd_t *)pud;
>> 256 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
>> 257 if (pmd_none(*pmd)) {
>> 258 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE,
>> 259 PAGE_SIZE);
>> 260 if (!pte)
>> 261 panic("%s: Failed to allocate %lu bytes align=%lx\n",
>> 262 __func__, PAGE_SIZE,
>> 263 PAGE_SIZE);
>> 264
>> 265 set_pmd(pmd, __pmd((unsigned long)pte));
>> 266 BUG_ON(pte != pte_offset_kernel(pmd, 0));
>> 267 }
>> 268 vaddr += PMD_SIZE;
>> 269 }
>> 270 k = 0;
>> 271 }
>> 272 j = 0;
>> 273 }
>> 274 #endif
>> 275 }
>> 276
>> 277 struct maar_walk_info {
>> 278 struct maar_config cfg[16];
>> 279 unsigned int num_cfg;
88 }; 280 };
89 281
90 static int alloc_kuser_page(void) !! 282 static int maar_res_walk(unsigned long start_pfn, unsigned long nr_pages,
>> 283 void *data)
91 { 284 {
92 extern char __kuser_helper_start[], __ !! 285 struct maar_walk_info *wi = data;
93 int kuser_sz = __kuser_helper_end - __ !! 286 struct maar_config *cfg = &wi->cfg[wi->num_cfg];
94 unsigned long vpage; !! 287 unsigned int maar_align;
>> 288
>> 289 /* MAAR registers hold physical addresses right shifted by 4 bits */
>> 290 maar_align = BIT(MIPS_MAAR_ADDR_SHIFT + 4);
>> 291
>> 292 /* Fill in the MAAR config entry */
>> 293 cfg->lower = ALIGN(PFN_PHYS(start_pfn), maar_align);
>> 294 cfg->upper = ALIGN_DOWN(PFN_PHYS(start_pfn + nr_pages), maar_align) - 1;
>> 295 cfg->attrs = MIPS_MAAR_S;
>> 296
>> 297 /* Ensure we don't overflow the cfg array */
>> 298 if (!WARN_ON(wi->num_cfg >= ARRAY_SIZE(wi->cfg)))
>> 299 wi->num_cfg++;
>> 300
>> 301 return 0;
>> 302 }
95 303
96 vpage = get_zeroed_page(GFP_ATOMIC); <<
97 if (!vpage) <<
98 return -ENOMEM; <<
99 304
100 /* Copy kuser helpers */ !! 305 unsigned __weak platform_maar_init(unsigned num_pairs)
101 memcpy((void *)vpage, __kuser_helper_s !! 306 {
>> 307 unsigned int num_configured;
>> 308 struct maar_walk_info wi;
102 309
103 flush_icache_range(vpage, vpage + KUSE !! 310 wi.num_cfg = 0;
104 kuser_page[0] = virt_to_page(vpage); !! 311 walk_system_ram_range(0, max_pfn, &wi, maar_res_walk);
105 312
106 return 0; !! 313 num_configured = maar_config(wi.cfg, wi.num_cfg, num_pairs);
>> 314 if (num_configured < wi.num_cfg)
>> 315 pr_warn("Not enough MAAR pairs (%u) for all memory regions (%u)\n",
>> 316 num_pairs, wi.num_cfg);
>> 317
>> 318 return num_configured;
107 } 319 }
108 arch_initcall(alloc_kuser_page); <<
109 320
110 int arch_setup_additional_pages(struct linux_b !! 321 void maar_init(void)
111 { 322 {
112 struct mm_struct *mm = current->mm; !! 323 unsigned num_maars, used, i;
113 struct vm_area_struct *vma; !! 324 phys_addr_t lower, upper, attr;
>> 325 static struct {
>> 326 struct maar_config cfgs[3];
>> 327 unsigned used;
>> 328 } recorded = { { { 0 } }, 0 };
>> 329
>> 330 if (!cpu_has_maar)
>> 331 return;
>> 332
>> 333 /* Detect the number of MAARs */
>> 334 write_c0_maari(~0);
>> 335 back_to_back_c0_hazard();
>> 336 num_maars = read_c0_maari() + 1;
>> 337
>> 338 /* MAARs should be in pairs */
>> 339 WARN_ON(num_maars % 2);
>> 340
>> 341 /* Set MAARs using values we recorded already */
>> 342 if (recorded.used) {
>> 343 used = maar_config(recorded.cfgs, recorded.used, num_maars / 2);
>> 344 BUG_ON(used != recorded.used);
>> 345 } else {
>> 346 /* Configure the required MAARs */
>> 347 used = platform_maar_init(num_maars / 2);
>> 348 }
>> 349
>> 350 /* Disable any further MAARs */
>> 351 for (i = (used * 2); i < num_maars; i++) {
>> 352 write_c0_maari(i);
>> 353 back_to_back_c0_hazard();
>> 354 write_c0_maar(0);
>> 355 back_to_back_c0_hazard();
>> 356 }
>> 357
>> 358 if (recorded.used)
>> 359 return;
>> 360
>> 361 pr_info("MAAR configuration:\n");
>> 362 for (i = 0; i < num_maars; i += 2) {
>> 363 write_c0_maari(i);
>> 364 back_to_back_c0_hazard();
>> 365 upper = read_c0_maar();
>> 366 #ifdef CONFIG_XPA
>> 367 upper |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT;
>> 368 #endif
>> 369
>> 370 write_c0_maari(i + 1);
>> 371 back_to_back_c0_hazard();
>> 372 lower = read_c0_maar();
>> 373 #ifdef CONFIG_XPA
>> 374 lower |= (phys_addr_t)readx_c0_maar() << MIPS_MAARX_ADDR_SHIFT;
>> 375 #endif
>> 376
>> 377 attr = lower & upper;
>> 378 lower = (lower & MIPS_MAAR_ADDR) << 4;
>> 379 upper = ((upper & MIPS_MAAR_ADDR) << 4) | 0xffff;
>> 380
>> 381 pr_info(" [%d]: ", i / 2);
>> 382 if ((attr & MIPS_MAAR_V) != MIPS_MAAR_V) {
>> 383 pr_cont("disabled\n");
>> 384 continue;
>> 385 }
>> 386
>> 387 pr_cont("%pa-%pa", &lower, &upper);
>> 388
>> 389 if (attr & MIPS_MAAR_S)
>> 390 pr_cont(" speculate");
>> 391
>> 392 pr_cont("\n");
>> 393
>> 394 /* Record the setup for use on secondary CPUs */
>> 395 if (used <= ARRAY_SIZE(recorded.cfgs)) {
>> 396 recorded.cfgs[recorded.used].lower = lower;
>> 397 recorded.cfgs[recorded.used].upper = upper;
>> 398 recorded.cfgs[recorded.used].attrs = attr;
>> 399 recorded.used++;
>> 400 }
>> 401 }
>> 402 }
114 403
115 mmap_write_lock(mm); !! 404 #ifndef CONFIG_NUMA
>> 405 void __init paging_init(void)
>> 406 {
>> 407 unsigned long max_zone_pfns[MAX_NR_ZONES];
116 408
117 /* Map kuser helpers to user space add !! 409 pagetable_init();
118 vma = _install_special_mapping(mm, KUS <<
119 VM_READ <<
120 VM_MAYEX <<
121 410
122 mmap_write_unlock(mm); !! 411 #ifdef CONFIG_ZONE_DMA
>> 412 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
>> 413 #endif
>> 414 #ifdef CONFIG_ZONE_DMA32
>> 415 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
>> 416 #endif
>> 417 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
>> 418 #ifdef CONFIG_HIGHMEM
>> 419 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
>> 420
>> 421 if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
>> 422 printk(KERN_WARNING "This processor doesn't support highmem."
>> 423 " %ldk highmem ignored\n",
>> 424 (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
>> 425 max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
>> 426
>> 427 max_mapnr = max_low_pfn;
>> 428 } else if (highend_pfn) {
>> 429 max_mapnr = highend_pfn;
>> 430 } else {
>> 431 max_mapnr = max_low_pfn;
>> 432 }
>> 433 #else
>> 434 max_mapnr = max_low_pfn;
>> 435 #endif
>> 436 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
123 437
124 return IS_ERR(vma) ? PTR_ERR(vma) : 0; !! 438 free_area_init(max_zone_pfns);
125 } 439 }
126 440
127 const char *arch_vma_name(struct vm_area_struc !! 441 #ifdef CONFIG_64BIT
>> 442 static struct kcore_list kcore_kseg0;
>> 443 #endif
>> 444
>> 445 static inline void __init mem_init_free_highmem(void)
128 { 446 {
129 return (vma->vm_start == KUSER_BASE) ? !! 447 #ifdef CONFIG_HIGHMEM
>> 448 unsigned long tmp;
>> 449
>> 450 if (cpu_has_dc_aliases)
>> 451 return;
>> 452
>> 453 for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
>> 454 struct page *page = pfn_to_page(tmp);
>> 455
>> 456 if (!memblock_is_memory(PFN_PHYS(tmp)))
>> 457 SetPageReserved(page);
>> 458 else
>> 459 free_highmem_page(page);
>> 460 }
>> 461 #endif
130 } 462 }
131 463
132 static const pgprot_t protection_map[16] = { !! 464 void __init mem_init(void)
133 [VM_NONE] !! 465 {
134 [VM_READ] !! 466 /*
135 [VM_WRITE] !! 467 * When PFN_PTE_SHIFT is greater than PAGE_SHIFT we won't have enough PTE
136 [VM_WRITE | VM_READ] !! 468 * bits to hold a full 32b physical address on MIPS32 systems.
137 [VM_EXEC] !! 469 */
138 [VM_EXEC | VM_READ] !! 470 BUILD_BUG_ON(IS_ENABLED(CONFIG_32BIT) && (PFN_PTE_SHIFT > PAGE_SHIFT));
139 [VM_EXEC | VM_WRITE] !! 471
140 [VM_EXEC | VM_WRITE | VM_READ] !! 472 maar_init();
141 [VM_SHARED] !! 473 memblock_free_all();
142 [VM_SHARED | VM_READ] !! 474 setup_zero_pages(); /* Setup zeroed pages. */
143 [VM_SHARED | VM_WRITE] !! 475 mem_init_free_highmem();
144 [VM_SHARED | VM_WRITE | VM_READ] !! 476
145 [VM_SHARED | VM_EXEC] !! 477 #ifdef CONFIG_64BIT
146 [VM_SHARED | VM_EXEC | VM_READ] !! 478 if ((unsigned long) &_text > (unsigned long) CKSEG0)
147 [VM_SHARED | VM_EXEC | VM_WRITE] !! 479 /* The -4 is a hack so that user tools don't have to handle
148 [VM_SHARED | VM_EXEC | VM_WRITE | VM_R !! 480 the overflow. */
149 }; !! 481 kclist_add(&kcore_kseg0, (void *) CKSEG0,
150 DECLARE_VM_GET_PAGE_PROT !! 482 0x80000000 - 4, KCORE_TEXT);
>> 483 #endif
>> 484 }
>> 485 #endif /* !CONFIG_NUMA */
>> 486
>> 487 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
>> 488 {
>> 489 unsigned long pfn;
>> 490
>> 491 for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
>> 492 struct page *page = pfn_to_page(pfn);
>> 493 void *addr = phys_to_virt(PFN_PHYS(pfn));
>> 494
>> 495 memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
>> 496 free_reserved_page(page);
>> 497 }
>> 498 printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
>> 499 }
>> 500
>> 501 void (*free_init_pages_eva)(void *begin, void *end) = NULL;
>> 502
>> 503 void __weak __init prom_free_prom_memory(void)
>> 504 {
>> 505 /* nothing to do */
>> 506 }
>> 507
>> 508 void __ref free_initmem(void)
>> 509 {
>> 510 prom_free_prom_memory();
>> 511 /*
>> 512 * Let the platform define a specific function to free the
>> 513 * init section since EVA may have used any possible mapping
>> 514 * between virtual and physical addresses.
>> 515 */
>> 516 if (free_init_pages_eva)
>> 517 free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
>> 518 else
>> 519 free_initmem_default(POISON_FREE_INITMEM);
>> 520 }
>> 521
>> 522 #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA
>> 523 unsigned long __per_cpu_offset[NR_CPUS] __read_mostly;
>> 524 EXPORT_SYMBOL(__per_cpu_offset);
>> 525
>> 526 static int __init pcpu_cpu_distance(unsigned int from, unsigned int to)
>> 527 {
>> 528 return node_distance(cpu_to_node(from), cpu_to_node(to));
>> 529 }
>> 530
>> 531 static int __init pcpu_cpu_to_node(int cpu)
>> 532 {
>> 533 return cpu_to_node(cpu);
>> 534 }
>> 535
>> 536 void __init setup_per_cpu_areas(void)
>> 537 {
>> 538 unsigned long delta;
>> 539 unsigned int cpu;
>> 540 int rc;
>> 541
>> 542 /*
>> 543 * Always reserve area for module percpu variables. That's
>> 544 * what the legacy allocator did.
>> 545 */
>> 546 rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE,
>> 547 PERCPU_DYNAMIC_RESERVE, PAGE_SIZE,
>> 548 pcpu_cpu_distance,
>> 549 pcpu_cpu_to_node);
>> 550 if (rc < 0)
>> 551 panic("Failed to initialize percpu areas.");
>> 552
>> 553 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start;
>> 554 for_each_possible_cpu(cpu)
>> 555 __per_cpu_offset[cpu] = delta + pcpu_unit_offsets[cpu];
>> 556 }
>> 557 #endif
>> 558
>> 559 #ifndef CONFIG_MIPS_PGD_C0_CONTEXT
>> 560 unsigned long pgd_current[NR_CPUS];
>> 561 #endif
>> 562
>> 563 /*
>> 564 * Align swapper_pg_dir in to 64K, allows its address to be loaded
>> 565 * with a single LUI instruction in the TLB handlers. If we used
>> 566 * __aligned(64K), its size would get rounded up to the alignment
>> 567 * size, and waste space. So we place it in its own section and align
>> 568 * it in the linker script.
>> 569 */
>> 570 pgd_t swapper_pg_dir[PTRS_PER_PGD] __section(".bss..swapper_pg_dir");
>> 571 #ifndef __PAGETABLE_PUD_FOLDED
>> 572 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss;
>> 573 #endif
>> 574 #ifndef __PAGETABLE_PMD_FOLDED
>> 575 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
>> 576 EXPORT_SYMBOL_GPL(invalid_pmd_table);
>> 577 #endif
>> 578 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
>> 579 EXPORT_SYMBOL(invalid_pte_table);
151 580
152 #ifdef CONFIG_EXECMEM 581 #ifdef CONFIG_EXECMEM
>> 582 #ifdef MODULES_VADDR
153 static struct execmem_info execmem_info __ro_a 583 static struct execmem_info execmem_info __ro_after_init;
154 584
155 struct execmem_info __init *execmem_arch_setup 585 struct execmem_info __init *execmem_arch_setup(void)
156 { 586 {
157 execmem_info = (struct execmem_info){ 587 execmem_info = (struct execmem_info){
158 .ranges = { 588 .ranges = {
159 [EXECMEM_DEFAULT] = { 589 [EXECMEM_DEFAULT] = {
160 .start = MODU 590 .start = MODULES_VADDR,
161 .end = MODU 591 .end = MODULES_END,
162 .pgprot = PAGE !! 592 .pgprot = PAGE_KERNEL,
163 .alignment = 1 593 .alignment = 1,
164 }, 594 },
165 }, 595 },
166 }; 596 };
167 597
168 return &execmem_info; 598 return &execmem_info;
169 } 599 }
>> 600 #endif
170 #endif /* CONFIG_EXECMEM */ 601 #endif /* CONFIG_EXECMEM */
171 602
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