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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerPC version
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
7 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
8 * Copyright (C) 1996 Paul Mackerras
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
10 *
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 */
14
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
35#include <asm/pgalloc.h>
36#include <asm/prom.h>
37#include <asm/io.h>
38#include <asm/mmu_context.h>
39#include <asm/pgtable.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
52#include <mm/mmu_decl.h>
53
54#ifndef CPU_FTR_COHERENT_ICACHE
55#define CPU_FTR_COHERENT_ICACHE 0 /* XXX for now */
56#define CPU_FTR_NOEXECUTE 0
57#endif
58
59unsigned long long memory_limit;
60bool init_mem_is_free;
61
62#ifdef CONFIG_HIGHMEM
63pte_t *kmap_pte;
64EXPORT_SYMBOL(kmap_pte);
65pgprot_t kmap_prot;
66EXPORT_SYMBOL(kmap_prot);
67
68static inline pte_t *virt_to_kpte(unsigned long vaddr)
69{
70 return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
71 vaddr), vaddr), vaddr);
72}
73#endif
74
75pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
76 unsigned long size, pgprot_t vma_prot)
77{
78 if (ppc_md.phys_mem_access_prot)
79 return ppc_md.phys_mem_access_prot(file, pfn, size, vma_prot);
80
81 if (!page_is_ram(pfn))
82 vma_prot = pgprot_noncached(vma_prot);
83
84 return vma_prot;
85}
86EXPORT_SYMBOL(phys_mem_access_prot);
87
88#ifdef CONFIG_MEMORY_HOTPLUG
89
90#ifdef CONFIG_NUMA
91int memory_add_physaddr_to_nid(u64 start)
92{
93 return hot_add_scn_to_nid(start);
94}
95#endif
96
97int __weak create_section_mapping(unsigned long start, unsigned long end, int nid)
98{
99 return -ENODEV;
100}
101
102int __weak remove_section_mapping(unsigned long start, unsigned long end)
103{
104 return -ENODEV;
105}
106
107int __ref arch_add_memory(int nid, u64 start, u64 size,
108 struct mhp_restrictions *restrictions)
109{
110 unsigned long start_pfn = start >> PAGE_SHIFT;
111 unsigned long nr_pages = size >> PAGE_SHIFT;
112 int rc;
113
114 resize_hpt_for_hotplug(memblock_phys_mem_size());
115
116 start = (unsigned long)__va(start);
117 rc = create_section_mapping(start, start + size, nid);
118 if (rc) {
119 pr_warn("Unable to create mapping for hot added memory 0x%llx..0x%llx: %d\n",
120 start, start + size, rc);
121 return -EFAULT;
122 }
123 flush_dcache_range(start, start + size);
124
125 return __add_pages(nid, start_pfn, nr_pages, restrictions);
126}
127
128void __ref arch_remove_memory(int nid, u64 start, u64 size,
129 struct vmem_altmap *altmap)
130{
131 unsigned long start_pfn = start >> PAGE_SHIFT;
132 unsigned long nr_pages = size >> PAGE_SHIFT;
133 struct page *page = pfn_to_page(start_pfn) + vmem_altmap_offset(altmap);
134 int ret;
135
136 __remove_pages(page_zone(page), start_pfn, nr_pages, altmap);
137
138 /* Remove htab bolted mappings for this section of memory */
139 start = (unsigned long)__va(start);
140 flush_dcache_range(start, start + size);
141 ret = remove_section_mapping(start, start + size);
142 WARN_ON_ONCE(ret);
143
144 /* Ensure all vmalloc mappings are flushed in case they also
145 * hit that section of memory
146 */
147 vm_unmap_aliases();
148
149 if (resize_hpt_for_hotplug(memblock_phys_mem_size()) == -ENOSPC)
150 pr_warn("Hash collision while resizing HPT\n");
151}
152#endif
153
154#ifndef CONFIG_NEED_MULTIPLE_NODES
155void __init mem_topology_setup(void)
156{
157 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
158 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
159#ifdef CONFIG_HIGHMEM
160 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
161#endif
162
163 /* Place all memblock_regions in the same node and merge contiguous
164 * memblock_regions
165 */
166 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
167}
168
169void __init initmem_init(void)
170{
171 /* XXX need to clip this if using highmem? */
172 sparse_memory_present_with_active_regions(0);
173 sparse_init();
174}
175
176/* mark pages that don't exist as nosave */
177static int __init mark_nonram_nosave(void)
178{
179 struct memblock_region *reg, *prev = NULL;
180
181 for_each_memblock(memory, reg) {
182 if (prev &&
183 memblock_region_memory_end_pfn(prev) < memblock_region_memory_base_pfn(reg))
184 register_nosave_region(memblock_region_memory_end_pfn(prev),
185 memblock_region_memory_base_pfn(reg));
186 prev = reg;
187 }
188 return 0;
189}
190#else /* CONFIG_NEED_MULTIPLE_NODES */
191static int __init mark_nonram_nosave(void)
192{
193 return 0;
194}
195#endif
196
197/*
198 * Zones usage:
199 *
200 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
201 * everything else. GFP_DMA32 page allocations automatically fall back to
202 * ZONE_DMA.
203 *
204 * By using 31-bit unconditionally, we can exploit ARCH_ZONE_DMA_BITS to
205 * inform the generic DMA mapping code. 32-bit only devices (if not handled
206 * by an IOMMU anyway) will take a first dip into ZONE_NORMAL and get
207 * otherwise served by ZONE_DMA.
208 */
209static unsigned long max_zone_pfns[MAX_NR_ZONES];
210
211/*
212 * paging_init() sets up the page tables - in fact we've already done this.
213 */
214void __init paging_init(void)
215{
216 unsigned long long total_ram = memblock_phys_mem_size();
217 phys_addr_t top_of_ram = memblock_end_of_DRAM();
218
219#ifdef CONFIG_PPC32
220 unsigned long v = __fix_to_virt(__end_of_fixed_addresses - 1);
221 unsigned long end = __fix_to_virt(FIX_HOLE);
222
223 for (; v < end; v += PAGE_SIZE)
224 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
225#endif
226
227#ifdef CONFIG_HIGHMEM
228 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
229 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
230
231 kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
232 kmap_prot = PAGE_KERNEL;
233#endif /* CONFIG_HIGHMEM */
234
235 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
236 (unsigned long long)top_of_ram, total_ram);
237 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
238 (long int)((top_of_ram - total_ram) >> 20));
239
240#ifdef CONFIG_ZONE_DMA
241 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
242 1UL << (ARCH_ZONE_DMA_BITS - PAGE_SHIFT));
243#endif
244 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
245#ifdef CONFIG_HIGHMEM
246 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
247#endif
248
249 free_area_init_nodes(max_zone_pfns);
250
251 mark_nonram_nosave();
252}
253
254void __init mem_init(void)
255{
256 /*
257 * book3s is limited to 16 page sizes due to encoding this in
258 * a 4-bit field for slices.
259 */
260 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
261
262#ifdef CONFIG_SWIOTLB
263 swiotlb_init(0);
264#endif
265
266 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
267 set_max_mapnr(max_pfn);
268 memblock_free_all();
269
270#ifdef CONFIG_HIGHMEM
271 {
272 unsigned long pfn, highmem_mapnr;
273
274 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
275 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
276 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
277 struct page *page = pfn_to_page(pfn);
278 if (!memblock_is_reserved(paddr))
279 free_highmem_page(page);
280 }
281 }
282#endif /* CONFIG_HIGHMEM */
283
284#if defined(CONFIG_PPC_FSL_BOOK3E) && !defined(CONFIG_SMP)
285 /*
286 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
287 * functions.... do it here for the non-smp case.
288 */
289 per_cpu(next_tlbcam_idx, smp_processor_id()) =
290 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
291#endif
292
293 mem_init_print_info(NULL);
294#ifdef CONFIG_PPC32
295 pr_info("Kernel virtual memory layout:\n");
296#ifdef CONFIG_KASAN
297 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
298 KASAN_SHADOW_START, KASAN_SHADOW_END);
299#endif
300 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
301#ifdef CONFIG_HIGHMEM
302 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
303 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
304#endif /* CONFIG_HIGHMEM */
305 if (ioremap_bot != IOREMAP_TOP)
306 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
307 ioremap_bot, IOREMAP_TOP);
308 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
309 VMALLOC_START, VMALLOC_END);
310#endif /* CONFIG_PPC32 */
311}
312
313void free_initmem(void)
314{
315 ppc_md.progress = ppc_printk_progress;
316 mark_initmem_nx();
317 init_mem_is_free = true;
318 free_initmem_default(POISON_FREE_INITMEM);
319}
320
321/*
322 * This is called when a page has been modified by the kernel.
323 * It just marks the page as not i-cache clean. We do the i-cache
324 * flush later when the page is given to a user process, if necessary.
325 */
326void flush_dcache_page(struct page *page)
327{
328 if (cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
329 return;
330 /* avoid an atomic op if possible */
331 if (test_bit(PG_arch_1, &page->flags))
332 clear_bit(PG_arch_1, &page->flags);
333}
334EXPORT_SYMBOL(flush_dcache_page);
335
336void flush_dcache_icache_page(struct page *page)
337{
338#ifdef CONFIG_HUGETLB_PAGE
339 if (PageCompound(page)) {
340 flush_dcache_icache_hugepage(page);
341 return;
342 }
343#endif
344#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC64)
345 /* On 8xx there is no need to kmap since highmem is not supported */
346 __flush_dcache_icache(page_address(page));
347#else
348 if (IS_ENABLED(CONFIG_BOOKE) || sizeof(phys_addr_t) > sizeof(void *)) {
349 void *start = kmap_atomic(page);
350 __flush_dcache_icache(start);
351 kunmap_atomic(start);
352 } else {
353 __flush_dcache_icache_phys(page_to_pfn(page) << PAGE_SHIFT);
354 }
355#endif
356}
357EXPORT_SYMBOL(flush_dcache_icache_page);
358
359void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
360{
361 clear_page(page);
362
363 /*
364 * We shouldn't have to do this, but some versions of glibc
365 * require it (ld.so assumes zero filled pages are icache clean)
366 * - Anton
367 */
368 flush_dcache_page(pg);
369}
370EXPORT_SYMBOL(clear_user_page);
371
372void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
373 struct page *pg)
374{
375 copy_page(vto, vfrom);
376
377 /*
378 * We should be able to use the following optimisation, however
379 * there are two problems.
380 * Firstly a bug in some versions of binutils meant PLT sections
381 * were not marked executable.
382 * Secondly the first word in the GOT section is blrl, used
383 * to establish the GOT address. Until recently the GOT was
384 * not marked executable.
385 * - Anton
386 */
387#if 0
388 if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
389 return;
390#endif
391
392 flush_dcache_page(pg);
393}
394
395void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
396 unsigned long addr, int len)
397{
398 unsigned long maddr;
399
400 maddr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
401 flush_icache_range(maddr, maddr + len);
402 kunmap(page);
403}
404EXPORT_SYMBOL(flush_icache_user_range);
405
406/*
407 * System memory should not be in /proc/iomem but various tools expect it
408 * (eg kdump).
409 */
410static int __init add_system_ram_resources(void)
411{
412 struct memblock_region *reg;
413
414 for_each_memblock(memory, reg) {
415 struct resource *res;
416 unsigned long base = reg->base;
417 unsigned long size = reg->size;
418
419 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
420 WARN_ON(!res);
421
422 if (res) {
423 res->name = "System RAM";
424 res->start = base;
425 res->end = base + size - 1;
426 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
427 WARN_ON(request_resource(&iomem_resource, res) < 0);
428 }
429 }
430
431 return 0;
432}
433subsys_initcall(add_system_ram_resources);
434
435#ifdef CONFIG_STRICT_DEVMEM
436/*
437 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
438 * is valid. The argument is a physical page number.
439 *
440 * Access has to be given to non-kernel-ram areas as well, these contain the
441 * PCI mmio resources as well as potential bios/acpi data regions.
442 */
443int devmem_is_allowed(unsigned long pfn)
444{
445 if (page_is_rtas_user_buf(pfn))
446 return 1;
447 if (iomem_is_exclusive(PFN_PHYS(pfn)))
448 return 0;
449 if (!page_is_ram(pfn))
450 return 1;
451 return 0;
452}
453#endif /* CONFIG_STRICT_DEVMEM */
454
455/*
456 * This is defined in kernel/resource.c but only powerpc needs to export it, for
457 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
458 */
459EXPORT_SYMBOL_GPL(walk_system_ram_range);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PowerPC version
4 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
5 *
6 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
7 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
8 * Copyright (C) 1996 Paul Mackerras
9 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
10 *
11 * Derived from "arch/i386/mm/init.c"
12 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
13 */
14
15#include <linux/memblock.h>
16#include <linux/highmem.h>
17#include <linux/suspend.h>
18#include <linux/dma-direct.h>
19#include <linux/execmem.h>
20#include <linux/vmalloc.h>
21
22#include <asm/swiotlb.h>
23#include <asm/machdep.h>
24#include <asm/rtas.h>
25#include <asm/kasan.h>
26#include <asm/svm.h>
27#include <asm/mmzone.h>
28#include <asm/ftrace.h>
29#include <asm/text-patching.h>
30#include <asm/setup.h>
31#include <asm/fixmap.h>
32
33#include <mm/mmu_decl.h>
34
35unsigned long long memory_limit __initdata;
36
37unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss;
38EXPORT_SYMBOL(empty_zero_page);
39
40pgprot_t __phys_mem_access_prot(unsigned long pfn, unsigned long size,
41 pgprot_t vma_prot)
42{
43 if (ppc_md.phys_mem_access_prot)
44 return ppc_md.phys_mem_access_prot(pfn, size, vma_prot);
45
46 if (!page_is_ram(pfn))
47 vma_prot = pgprot_noncached(vma_prot);
48
49 return vma_prot;
50}
51EXPORT_SYMBOL(__phys_mem_access_prot);
52
53#ifdef CONFIG_MEMORY_HOTPLUG
54static DEFINE_MUTEX(linear_mapping_mutex);
55
56#ifdef CONFIG_NUMA
57int memory_add_physaddr_to_nid(u64 start)
58{
59 return hot_add_scn_to_nid(start);
60}
61EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
62#endif
63
64int __weak create_section_mapping(unsigned long start, unsigned long end,
65 int nid, pgprot_t prot)
66{
67 return -ENODEV;
68}
69
70int __weak remove_section_mapping(unsigned long start, unsigned long end)
71{
72 return -ENODEV;
73}
74
75int __ref arch_create_linear_mapping(int nid, u64 start, u64 size,
76 struct mhp_params *params)
77{
78 int rc;
79
80 start = (unsigned long)__va(start);
81 mutex_lock(&linear_mapping_mutex);
82 rc = create_section_mapping(start, start + size, nid,
83 params->pgprot);
84 mutex_unlock(&linear_mapping_mutex);
85 if (rc) {
86 pr_warn("Unable to create linear mapping for 0x%llx..0x%llx: %d\n",
87 start, start + size, rc);
88 return -EFAULT;
89 }
90 return 0;
91}
92
93void __ref arch_remove_linear_mapping(u64 start, u64 size)
94{
95 int ret;
96
97 /* Remove htab bolted mappings for this section of memory */
98 start = (unsigned long)__va(start);
99
100 mutex_lock(&linear_mapping_mutex);
101 ret = remove_section_mapping(start, start + size);
102 mutex_unlock(&linear_mapping_mutex);
103 if (ret)
104 pr_warn("Unable to remove linear mapping for 0x%llx..0x%llx: %d\n",
105 start, start + size, ret);
106
107 /* Ensure all vmalloc mappings are flushed in case they also
108 * hit that section of memory
109 */
110 vm_unmap_aliases();
111}
112
113/*
114 * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
115 * updating.
116 */
117static void update_end_of_memory_vars(u64 start, u64 size)
118{
119 unsigned long end_pfn = PFN_UP(start + size);
120
121 if (end_pfn > max_pfn) {
122 max_pfn = end_pfn;
123 max_low_pfn = end_pfn;
124 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
125 }
126}
127
128int __ref add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
129 struct mhp_params *params)
130{
131 int ret;
132
133 ret = __add_pages(nid, start_pfn, nr_pages, params);
134 if (ret)
135 return ret;
136
137 /* update max_pfn, max_low_pfn and high_memory */
138 update_end_of_memory_vars(start_pfn << PAGE_SHIFT,
139 nr_pages << PAGE_SHIFT);
140
141 return ret;
142}
143
144int __ref arch_add_memory(int nid, u64 start, u64 size,
145 struct mhp_params *params)
146{
147 unsigned long start_pfn = start >> PAGE_SHIFT;
148 unsigned long nr_pages = size >> PAGE_SHIFT;
149 int rc;
150
151 rc = arch_create_linear_mapping(nid, start, size, params);
152 if (rc)
153 return rc;
154 rc = add_pages(nid, start_pfn, nr_pages, params);
155 if (rc)
156 arch_remove_linear_mapping(start, size);
157 return rc;
158}
159
160void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
161{
162 unsigned long start_pfn = start >> PAGE_SHIFT;
163 unsigned long nr_pages = size >> PAGE_SHIFT;
164
165 __remove_pages(start_pfn, nr_pages, altmap);
166 arch_remove_linear_mapping(start, size);
167}
168#endif
169
170#ifndef CONFIG_NUMA
171void __init mem_topology_setup(void)
172{
173 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
174 min_low_pfn = MEMORY_START >> PAGE_SHIFT;
175#ifdef CONFIG_HIGHMEM
176 max_low_pfn = lowmem_end_addr >> PAGE_SHIFT;
177#endif
178
179 /* Place all memblock_regions in the same node and merge contiguous
180 * memblock_regions
181 */
182 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
183}
184
185void __init initmem_init(void)
186{
187 sparse_init();
188}
189
190/* mark pages that don't exist as nosave */
191static int __init mark_nonram_nosave(void)
192{
193 unsigned long spfn, epfn, prev = 0;
194 int i;
195
196 for_each_mem_pfn_range(i, MAX_NUMNODES, &spfn, &epfn, NULL) {
197 if (prev && prev < spfn)
198 register_nosave_region(prev, spfn);
199
200 prev = epfn;
201 }
202
203 return 0;
204}
205#else /* CONFIG_NUMA */
206static int __init mark_nonram_nosave(void)
207{
208 return 0;
209}
210#endif
211
212/*
213 * Zones usage:
214 *
215 * We setup ZONE_DMA to be 31-bits on all platforms and ZONE_NORMAL to be
216 * everything else. GFP_DMA32 page allocations automatically fall back to
217 * ZONE_DMA.
218 *
219 * By using 31-bit unconditionally, we can exploit zone_dma_limit to inform the
220 * generic DMA mapping code. 32-bit only devices (if not handled by an IOMMU
221 * anyway) will take a first dip into ZONE_NORMAL and get otherwise served by
222 * ZONE_DMA.
223 */
224static unsigned long max_zone_pfns[MAX_NR_ZONES];
225
226/*
227 * paging_init() sets up the page tables - in fact we've already done this.
228 */
229void __init paging_init(void)
230{
231 unsigned long long total_ram = memblock_phys_mem_size();
232 phys_addr_t top_of_ram = memblock_end_of_DRAM();
233 int zone_dma_bits;
234
235#ifdef CONFIG_HIGHMEM
236 unsigned long v = __fix_to_virt(FIX_KMAP_END);
237 unsigned long end = __fix_to_virt(FIX_KMAP_BEGIN);
238
239 for (; v < end; v += PAGE_SIZE)
240 map_kernel_page(v, 0, __pgprot(0)); /* XXX gross */
241
242 map_kernel_page(PKMAP_BASE, 0, __pgprot(0)); /* XXX gross */
243 pkmap_page_table = virt_to_kpte(PKMAP_BASE);
244#endif /* CONFIG_HIGHMEM */
245
246 printk(KERN_DEBUG "Top of RAM: 0x%llx, Total RAM: 0x%llx\n",
247 (unsigned long long)top_of_ram, total_ram);
248 printk(KERN_DEBUG "Memory hole size: %ldMB\n",
249 (long int)((top_of_ram - total_ram) >> 20));
250
251 /*
252 * Allow 30-bit DMA for very limited Broadcom wifi chips on many
253 * powerbooks.
254 */
255 if (IS_ENABLED(CONFIG_PPC32))
256 zone_dma_bits = 30;
257 else
258 zone_dma_bits = 31;
259
260 zone_dma_limit = DMA_BIT_MASK(zone_dma_bits);
261
262#ifdef CONFIG_ZONE_DMA
263 max_zone_pfns[ZONE_DMA] = min(max_low_pfn,
264 1UL << (zone_dma_bits - PAGE_SHIFT));
265#endif
266 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
267#ifdef CONFIG_HIGHMEM
268 max_zone_pfns[ZONE_HIGHMEM] = max_pfn;
269#endif
270
271 free_area_init(max_zone_pfns);
272
273 mark_nonram_nosave();
274}
275
276void __init mem_init(void)
277{
278 /*
279 * book3s is limited to 16 page sizes due to encoding this in
280 * a 4-bit field for slices.
281 */
282 BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
283
284#ifdef CONFIG_SWIOTLB
285 /*
286 * Some platforms (e.g. 85xx) limit DMA-able memory way below
287 * 4G. We force memblock to bottom-up mode to ensure that the
288 * memory allocated in swiotlb_init() is DMA-able.
289 * As it's the last memblock allocation, no need to reset it
290 * back to to-down.
291 */
292 memblock_set_bottom_up(true);
293 swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags);
294#endif
295
296 kasan_late_init();
297
298 memblock_free_all();
299
300#ifdef CONFIG_HIGHMEM
301 {
302 unsigned long pfn, highmem_mapnr;
303
304 highmem_mapnr = lowmem_end_addr >> PAGE_SHIFT;
305 for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
306 phys_addr_t paddr = (phys_addr_t)pfn << PAGE_SHIFT;
307 struct page *page = pfn_to_page(pfn);
308 if (memblock_is_memory(paddr) && !memblock_is_reserved(paddr))
309 free_highmem_page(page);
310 }
311 }
312#endif /* CONFIG_HIGHMEM */
313
314#if defined(CONFIG_PPC_E500) && !defined(CONFIG_SMP)
315 /*
316 * If smp is enabled, next_tlbcam_idx is initialized in the cpu up
317 * functions.... do it here for the non-smp case.
318 */
319 per_cpu(next_tlbcam_idx, smp_processor_id()) =
320 (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) - 1;
321#endif
322
323#ifdef CONFIG_PPC32
324 pr_info("Kernel virtual memory layout:\n");
325#ifdef CONFIG_KASAN
326 pr_info(" * 0x%08lx..0x%08lx : kasan shadow mem\n",
327 KASAN_SHADOW_START, KASAN_SHADOW_END);
328#endif
329 pr_info(" * 0x%08lx..0x%08lx : fixmap\n", FIXADDR_START, FIXADDR_TOP);
330#ifdef CONFIG_HIGHMEM
331 pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
332 PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
333#endif /* CONFIG_HIGHMEM */
334 if (ioremap_bot != IOREMAP_TOP)
335 pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
336 ioremap_bot, IOREMAP_TOP);
337 pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
338 VMALLOC_START, VMALLOC_END);
339#ifdef MODULES_VADDR
340 pr_info(" * 0x%08lx..0x%08lx : modules\n",
341 MODULES_VADDR, MODULES_END);
342#endif
343#endif /* CONFIG_PPC32 */
344}
345
346void free_initmem(void)
347{
348 ppc_md.progress = ppc_printk_progress;
349 mark_initmem_nx();
350 free_initmem_default(POISON_FREE_INITMEM);
351 ftrace_free_init_tramp();
352}
353
354/*
355 * System memory should not be in /proc/iomem but various tools expect it
356 * (eg kdump).
357 */
358static int __init add_system_ram_resources(void)
359{
360 phys_addr_t start, end;
361 u64 i;
362
363 for_each_mem_range(i, &start, &end) {
364 struct resource *res;
365
366 res = kzalloc(sizeof(struct resource), GFP_KERNEL);
367 WARN_ON(!res);
368
369 if (res) {
370 res->name = "System RAM";
371 res->start = start;
372 /*
373 * In memblock, end points to the first byte after
374 * the range while in resourses, end points to the
375 * last byte in the range.
376 */
377 res->end = end - 1;
378 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
379 WARN_ON(request_resource(&iomem_resource, res) < 0);
380 }
381 }
382
383 return 0;
384}
385subsys_initcall(add_system_ram_resources);
386
387#ifdef CONFIG_STRICT_DEVMEM
388/*
389 * devmem_is_allowed(): check to see if /dev/mem access to a certain address
390 * is valid. The argument is a physical page number.
391 *
392 * Access has to be given to non-kernel-ram areas as well, these contain the
393 * PCI mmio resources as well as potential bios/acpi data regions.
394 */
395int devmem_is_allowed(unsigned long pfn)
396{
397 if (page_is_rtas_user_buf(pfn))
398 return 1;
399 if (iomem_is_exclusive(PFN_PHYS(pfn)))
400 return 0;
401 if (!page_is_ram(pfn))
402 return 1;
403 return 0;
404}
405#endif /* CONFIG_STRICT_DEVMEM */
406
407/*
408 * This is defined in kernel/resource.c but only powerpc needs to export it, for
409 * the EHEA driver. Drop this when drivers/net/ethernet/ibm/ehea is removed.
410 */
411EXPORT_SYMBOL_GPL(walk_system_ram_range);
412
413#ifdef CONFIG_EXECMEM
414static struct execmem_info execmem_info __ro_after_init;
415
416#if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)
417static void prealloc_execmem_pgtable(void)
418{
419 unsigned long va;
420
421 for (va = ALIGN_DOWN(MODULES_VADDR, PGDIR_SIZE); va < MODULES_END; va += PGDIR_SIZE)
422 pte_alloc_kernel(pmd_off_k(va), va);
423}
424#else
425static void prealloc_execmem_pgtable(void) { }
426#endif
427
428struct execmem_info __init *execmem_arch_setup(void)
429{
430 pgprot_t kprobes_prot = strict_module_rwx_enabled() ? PAGE_KERNEL_ROX : PAGE_KERNEL_EXEC;
431 pgprot_t prot = strict_module_rwx_enabled() ? PAGE_KERNEL : PAGE_KERNEL_EXEC;
432 unsigned long fallback_start = 0, fallback_end = 0;
433 unsigned long start, end;
434
435 /*
436 * BOOK3S_32 and 8xx define MODULES_VADDR for text allocations and
437 * allow allocating data in the entire vmalloc space
438 */
439#ifdef MODULES_VADDR
440 unsigned long limit = (unsigned long)_etext - SZ_32M;
441
442 BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
443
444 /* First try within 32M limit from _etext to avoid branch trampolines */
445 if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) {
446 start = limit;
447 fallback_start = MODULES_VADDR;
448 fallback_end = MODULES_END;
449 } else {
450 start = MODULES_VADDR;
451 }
452
453 end = MODULES_END;
454#else
455 start = VMALLOC_START;
456 end = VMALLOC_END;
457#endif
458
459 prealloc_execmem_pgtable();
460
461 execmem_info = (struct execmem_info){
462 .ranges = {
463 [EXECMEM_DEFAULT] = {
464 .start = start,
465 .end = end,
466 .pgprot = prot,
467 .alignment = 1,
468 .fallback_start = fallback_start,
469 .fallback_end = fallback_end,
470 },
471 [EXECMEM_KPROBES] = {
472 .start = VMALLOC_START,
473 .end = VMALLOC_END,
474 .pgprot = kprobes_prot,
475 .alignment = 1,
476 },
477 [EXECMEM_MODULE_DATA] = {
478 .start = VMALLOC_START,
479 .end = VMALLOC_END,
480 .pgprot = PAGE_KERNEL,
481 .alignment = 1,
482 },
483 },
484 };
485
486 return &execmem_info;
487}
488#endif /* CONFIG_EXECMEM */