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15#include <linux/export.h>
16#include <linux/sched.h>
17#include <linux/kernel.h>
18#include <linux/errno.h>
19#include <linux/string.h>
20#include <linux/gfp.h>
21#include <linux/types.h>
22#include <linux/mm.h>
23#include <linux/stddef.h>
24#include <linux/init.h>
25#include <linux/memblock.h>
26#include <linux/highmem.h>
27#include <linux/initrd.h>
28#include <linux/pagemap.h>
29#include <linux/suspend.h>
30#include <linux/hugetlb.h>
31#include <linux/slab.h>
32#include <linux/vmalloc.h>
33#include <linux/memremap.h>
34#include <linux/dma-direct.h>
35#include <linux/kprobes.h>
36
37#include <asm/prom.h>
38#include <asm/io.h>
39#include <asm/mmu_context.h>
40#include <asm/mmu.h>
41#include <asm/smp.h>
42#include <asm/machdep.h>
43#include <asm/btext.h>
44#include <asm/tlb.h>
45#include <asm/sections.h>
46#include <asm/sparsemem.h>
47#include <asm/vdso.h>
48#include <asm/fixmap.h>
49#include <asm/swiotlb.h>
50#include <asm/rtas.h>
51#include <asm/kasan.h>
52
53#include <mm/mmu_decl.h>
54
55#ifndef CPU_FTR_COHERENT_ICACHE
56#define CPU_FTR_COHERENT_ICACHE 0
57#define CPU_FTR_NOEXECUTE 0
58#endif
59
60unsigned long long memory_limit;
61bool init_mem_is_free;
62
63#ifdef CONFIG_HIGHMEM
64pte_t *kmap_pte;
65EXPORT_SYMBOL(kmap_pte);
66#endif
67
68pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
69 unsigned long size, pgprot_t vma_prot)
70{
71 if (ppc_md.phys_mem_access_prot)
72 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
73
74 if (!page_is_ram(pfn))
75 vma_prot = pgprot_noncached(vma_prot);
76
77 return vma_prot;
78}
79EXPORT_SYMBOL(phys_mem_access_prot);
80
81#ifdef CONFIG_MEMORY_HOTPLUG
82
83#ifdef CONFIG_NUMA
84int memory_add_physaddr_to_nid(u64 start)
85{
86 return hot_add_scn_to_nid(start);
87}
88#endif
89
90int __weak create_section_mapping(unsigned long start, unsigned long end,
91 int nid, pgprot_t prot)
92{
93 return -ENODEV;
94}
95
96int __weak remove_section_mapping(unsigned long start, unsigned long end)
97{
98 return -ENODEV;
99}
100
101#define FLUSH_CHUNK_SIZE SZ_1G
102
103
104
105
106
107
108
109
110
111static void flush_dcache_range_chunked(unsigned long start, unsigned long stop,
112 unsigned long chunk)
113{
114 unsigned long i;
115
116 for (i = start; i < stop; i += chunk) {
117 flush_dcache_range(i, min(stop, i + chunk));
118 cond_resched();
119 }
120}
121
122int __ref arch_add_memory(int nid, u64 start, u64 size,
123 struct mhp_params *params)
124{
125 unsigned long start_pfn = start >> PAGE_SHIFT;
126 unsigned long nr_pages = size >> PAGE_SHIFT;
127 int rc;
128
129 start = (unsigned long)__va(start);
130 rc = create_section_mapping(start, start + size, nid,
131 params->pgprot);
132 if (rc) {
133 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
134 start, start + size, rc);
135 return -EFAULT;
136 }
137
138 return __add_pages(nid, start_pfn, nr_pages, params);
139}
140
141void __ref arch_remove_memory(int nid, u64 start, u64 size,
142 struct vmem_altmap *altmap)
143{
144 unsigned long start_pfn = start >> PAGE_SHIFT;
145 unsigned long nr_pages = size >> PAGE_SHIFT;
146 int ret;
147
148 __remove_pages(start_pfn, nr_pages, altmap);
149
150
151 start = (unsigned long)__va(start);
152 flush_dcache_range_chunked(start, start + size, FLUSH_CHUNK_SIZE);
153
154 ret = remove_section_mapping(start, start + size);
155 WARN_ON_ONCE(ret);
156
157
158
159
160 vm_unmap_aliases();
161}
162#endif
163
164#ifndef CONFIG_NEED_MULTIPLE_NODES
165void __init mem_topology_setup(void)
166{
167 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
168 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
169#ifdef CONFIG_HIGHMEM
170 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
171#endif
172
173
174
175
176 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
177}
178
179void __init initmem_init(void)
180{
181 sparse_init();
182}
183
184
185static int __init mark_nonram_nosave(void)
186{
187 struct memblock_region *reg, *prev = NULL;
188
189 for_each_memblock(memory, reg) {
190 if (prev &&
191 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
192 register_nosave_region(memblock_region_memory_end_pfn(prev),
193 memblock_region_memory_base_pfn(reg));
194 prev = reg;
195 }
196 return 0;
197}
198#else
199static int __init mark_nonram_nosave(void)
200{
201 return 0;
202}
203#endif
204
205
206
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209
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211
212
213
214
215
216
217static unsigned long max_zone_pfns[MAX_NR_ZONES];
218
219
220
221
222void __init paging_init(void)
223{
224 unsigned long long total_ram = memblock_phys_mem_size();
225 phys_addr_t top_of_ram = memblock_end_of_DRAM();
226
227#ifdef CONFIG_HIGHMEM
228 unsigned long v = __fix_to_virt(FIX_KMAP_END);
229 unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
230
231 for (; v < end; v += PAGE_SIZE)
232 map_kernel_page(v, 0, __pgprot(0));
233
234 map_kernel_page(PKMAP_BASE, 0, __pgprot(0));
235 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
236
237 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
238#endif
239
240 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
241 (unsigned long long)top_of_ram, total_ram);
242 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
243 (long int)((top_of_ram - total_ram) >> 20));
244
245
246
247
248
249 if (IS_ENABLED(CONFIG_PPC32))
250 zone_dma_bits = 30;
251 else
252 zone_dma_bits = 31;
253
254#ifdef CONFIG_ZONE_DMA
255 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
256 1UL << (zone_dma_bits - PAGE_SHIFT));
257#endif
258 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
259#ifdef CONFIG_HIGHMEM
260 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
261#endif
262
263 free_area_init(max_zone_pfns);
264
265 mark_nonram_nosave();
266}
267
268void __init mem_init(void)
269{
270
271
272
273
274 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
275
276#ifdef CONFIG_SWIOTLB
277
278
279
280
281
282
283
284 memblock_set_bottom_up(true);
285 swiotlb_init(0);
286#endif
287
288 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
289 set_max_mapnr(max_pfn);
290
291 kasan_late_init();
292
293 memblock_free_all();
294
295#ifdef CONFIG_HIGHMEM
296 {
297 unsigned long pfn, highmem_mapnr;
298
299 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
300 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
301 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
302 struct page *page = pfn_to_page(pfn);
303 if (!memblock_is_reserved(paddr))
304 free_highmem_page(page);
305 }
306 }
307#endif
308
309#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
310
311
312
313
314 per_cpu(next_tlbcam_idx, smp_processor_id()) =
315 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
316#endif
317
318 mem_init_print_info(NULL);
319#ifdef CONFIG_PPC32
320 pr_info("Kernel virtual memory layout:\n");
321#ifdef CONFIG_KASAN
322 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
323 KASAN_SHADOW_START, KASAN_SHADOW_END);
324#endif
325 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
326#ifdef CONFIG_HIGHMEM
327 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
328 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
329#endif
330 if (ioremap_bot != IOREMAP_TOP)
331 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
332 ioremap_bot, IOREMAP_TOP);
333 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
334 VMALLOC_START, VMALLOC_END);
335#endif
336}
337
338void free_initmem(void)
339{
340 ppc_md.progress = ppc_printk_progress;
341 mark_initmem_nx();
342 init_mem_is_free = true;
343 free_initmem_default(POISON_FREE_INITMEM);
344}
345
346
347
348
349
350
351static inline bool flush_coherent_icache(unsigned long addr)
352{
353
354
355
356
357
358
359 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) {
360 mb();
361 allow_read_from_user((const void __user *)addr, L1_CACHE_BYTES);
362 icbi((void *)addr);
363 prevent_read_from_user((const void __user *)addr, L1_CACHE_BYTES);
364 mb();
365 isync();
366 return true;
367 }
368
369 return false;
370}
371
372
373
374
375
376
377static void invalidate_icache_range(unsigned long start, unsigned long stop)
378{
379 unsigned long shift = l1_icache_shift();
380 unsigned long bytes = l1_icache_bytes();
381 char *addr = (char *)(start & ~(bytes - 1));
382 unsigned long size = stop - (unsigned long)addr + (bytes - 1);
383 unsigned long i;
384
385 for (i = 0; i < size >> shift; i++, addr += bytes)
386 icbi(addr);
387
388 mb();
389 isync();
390}
391
392
393
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395
396
397
398
399
400
401void flush_icache_range(unsigned long start, unsigned long stop)
402{
403 if (flush_coherent_icache(start))
404 return;
405
406 clean_dcache_range(start, stop);
407
408 if (IS_ENABLED(CONFIG_44x)) {
409
410
411
412
413
414 iccci((void *)start);
415 mb();
416 isync();
417 } else
418 invalidate_icache_range(start, stop);
419}
420EXPORT_SYMBOL(flush_icache_range);
421
422#if !defined(CONFIG_PPC_8xx) && !defined(CONFIG_PPC64)
423
424
425
426
427static void flush_dcache_icache_phys(unsigned long physaddr)
428{
429 unsigned long bytes = l1_dcache_bytes();
430 unsigned long nb = PAGE_SIZE / bytes;
431 unsigned long addr = physaddr & PAGE_MASK;
432 unsigned long msr, msr0;
433 unsigned long loop1 = addr, loop2 = addr;
434
435 msr0 = mfmsr();
436 msr = msr0 & ~MSR_DR;
437
438
439
440
441 asm volatile(
442 " mtctr %2;\n"
443 " mtmsr %3;\n"
444 " isync;\n"
445 "0: dcbst 0, %0;\n"
446 " addi %0, %0, %4;\n"
447 " bdnz 0b;\n"
448 " sync;\n"
449 " mtctr %2;\n"
450 "1: icbi 0, %1;\n"
451 " addi %1, %1, %4;\n"
452 " bdnz 1b;\n"
453 " sync;\n"
454 " mtmsr %5;\n"
455 " isync;\n"
456 : "+&r" (loop1), "+&r" (loop2)
457 : "r" (nb), "r" (msr), "i" (bytes), "r" (msr0)
458 : "ctr", "memory");
459}
460NOKPROBE_SYMBOL(flush_dcache_icache_phys)
461#endif
462
463
464
465
466
467
468void flush_dcache_page(struct page *page)
469{
470 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
471 return;
472
473 if (test_bit(PG_arch_1, &page->flags))
474 clear_bit(PG_arch_1, &page->flags);
475}
476EXPORT_SYMBOL(flush_dcache_page);
477
478void flush_dcache_icache_page(struct page *page)
479{
480#ifdef CONFIG_HUGETLB_PAGE
481 if (PageCompound(page)) {
482 flush_dcache_icache_hugepage(page);
483 return;
484 }
485#endif
486#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
487
488 __flush_dcache_icache(page_address(page));
489#else
490 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
491 void *start = kmap_atomic(page);
492 __flush_dcache_icache(start);
493 kunmap_atomic(start);
494 } else {
495 unsigned long addr = page_to_pfn(page) << PAGE_SHIFT;
496
497 if (flush_coherent_icache(addr))
498 return;
499 flush_dcache_icache_phys(addr);
500 }
501#endif
502}
503EXPORT_SYMBOL(flush_dcache_icache_page);
504
505
506
507
508
509
510
511
512void __flush_dcache_icache(void *p)
513{
514 unsigned long addr = (unsigned long)p;
515
516 if (flush_coherent_icache(addr))
517 return;
518
519 clean_dcache_range(addr, addr + PAGE_SIZE);
520
521
522
523
524
525
526
527
528
529 if (cpu_has_feature(MMU_FTR_TYPE_44x))
530 return;
531
532 invalidate_icache_range(addr, addr + PAGE_SIZE);
533}
534
535void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
536{
537 clear_page(page);
538
539
540
541
542
543
544 flush_dcache_page(pg);
545}
546EXPORT_SYMBOL(clear_user_page);
547
548void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
549 struct page *pg)
550{
551 copy_page(vto, vfrom);
552
553
554
555
556
557
558
559
560
561
562
563#if 0
564 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
565 return;
566#endif
567
568 flush_dcache_page(pg);
569}
570
571void flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
572 unsigned long addr, int len)
573{
574 unsigned long maddr;
575
576 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
577 flush_icache_range(maddr, maddr + len);
578 kunmap(page);
579}
580
581
582
583
584
585static int __init add_system_ram_resources(void)
586{
587 struct memblock_region *reg;
588
589 for_each_memblock(memory, reg) {
590 struct resource *res;
591 unsigned long base = reg->base;
592 unsigned long size = reg->size;
593
594 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
595 WARN_ON(!res);
596
597 if (res) {
598 res->name = "System RAM";
599 res->start = base;
600 res->end = base + size - 1;
601 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
602 WARN_ON(request_resource(&iomem_resource, res) < 0);
603 }
604 }
605
606 return 0;
607}
608subsys_initcall(add_system_ram_resources);
609
610#ifdef CONFIG_STRICT_DEVMEM
611
612
613
614
615
616
617
618int devmem_is_allowed(unsigned long pfn)
619{
620 if (page_is_rtas_user_buf(pfn))
621 return 1;
622 if (iomem_is_exclusive(PFN_PHYS(pfn)))
623 return 0;
624 if (!page_is_ram(pfn))
625 return 1;
626 return 0;
627}
628#endif
629
630
631
632
633
634EXPORT_SYMBOL_GPL(walk_system_ram_range);
635