1 // SPDX-License-Identifier: GPL-2.0-only
3 * linux/arch/sh/mm/init.c
5 * Copyright (C) 1999 Niibe Yutaka
6 * Copyright (C) 2002 - 2011 Paul Mundt
8 * Based on linux/arch/i386/mm/init.c:
9 * Copyright (C) 1995 Linus Torvalds
12 #include <linux/swap.h>
13 #include <linux/init.h>
14 #include <linux/gfp.h>
15 #include <linux/memblock.h>
16 #include <linux/proc_fs.h>
17 #include <linux/pagemap.h>
18 #include <linux/percpu.h>
20 #include <linux/dma-mapping.h>
21 #include <linux/export.h>
22 #include <asm/mmu_context.h>
23 #include <asm/mmzone.h>
24 #include <asm/kexec.h>
26 #include <asm/cacheflush.h>
27 #include <asm/sections.h>
28 #include <asm/setup.h>
29 #include <asm/cache.h>
30 #include <asm/pgalloc.h>
31 #include <linux/sizes.h>
33 pgd_t swapper_pg_dir[PTRS_PER_PGD];
35 void __init generic_mem_init(void)
37 memblock_add(__MEMORY_START, __MEMORY_SIZE);
40 void __init __weak plat_mem_setup(void)
42 /* Nothing to see here, move along. */
46 static pte_t *__get_pte_phys(unsigned long addr)
53 pgd = pgd_offset_k(addr);
59 p4d = p4d_alloc(NULL, pgd, addr);
65 pud = pud_alloc(NULL, p4d, addr);
71 pmd = pmd_alloc(NULL, pud, addr);
77 return pte_offset_kernel(pmd, addr);
80 static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
84 pte = __get_pte_phys(addr);
85 if (!pte_none(*pte)) {
90 set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
91 local_flush_tlb_one(get_asid(), addr);
93 if (pgprot_val(prot) & _PAGE_WIRED)
94 tlb_wire_entry(NULL, addr, *pte);
97 static void clear_pte_phys(unsigned long addr, pgprot_t prot)
101 pte = __get_pte_phys(addr);
103 if (pgprot_val(prot) & _PAGE_WIRED)
106 set_pte(pte, pfn_pte(0, __pgprot(0)));
107 local_flush_tlb_one(get_asid(), addr);
110 void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
112 unsigned long address = __fix_to_virt(idx);
114 if (idx >= __end_of_fixed_addresses) {
119 set_pte_phys(address, phys, prot);
122 void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
124 unsigned long address = __fix_to_virt(idx);
126 if (idx >= __end_of_fixed_addresses) {
131 clear_pte_phys(address, prot);
134 static pmd_t * __init one_md_table_init(pud_t *pud)
136 if (pud_none(*pud)) {
139 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
141 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
142 __func__, PAGE_SIZE, PAGE_SIZE);
143 pud_populate(&init_mm, pud, pmd);
144 BUG_ON(pmd != pmd_offset(pud, 0));
147 return pmd_offset(pud, 0);
150 static pte_t * __init one_page_table_init(pmd_t *pmd)
152 if (pmd_none(*pmd)) {
155 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
157 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
158 __func__, PAGE_SIZE, PAGE_SIZE);
159 pmd_populate_kernel(&init_mm, pmd, pte);
160 BUG_ON(pte != pte_offset_kernel(pmd, 0));
163 return pte_offset_kernel(pmd, 0);
166 static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
167 unsigned long vaddr, pte_t *lastpte)
172 void __init page_table_range_init(unsigned long start, unsigned long end,
183 i = pgd_index(vaddr);
184 j = pud_index(vaddr);
185 k = pmd_index(vaddr);
188 for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
190 for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
191 pmd = one_md_table_init(pud);
192 #ifndef __PAGETABLE_PMD_FOLDED
195 for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
196 pte = page_table_kmap_check(one_page_table_init(pmd),
205 #endif /* CONFIG_MMU */
207 void __init allocate_pgdat(unsigned int nid)
209 unsigned long start_pfn, end_pfn;
211 get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
213 #ifdef CONFIG_NEED_MULTIPLE_NODES
214 NODE_DATA(nid) = memblock_alloc_try_nid(
215 sizeof(struct pglist_data),
216 SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
217 MEMBLOCK_ALLOC_ACCESSIBLE, nid);
219 panic("Can't allocate pgdat for node %d\n", nid);
222 NODE_DATA(nid)->node_start_pfn = start_pfn;
223 NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
226 static void __init do_init_bootmem(void)
228 struct memblock_region *reg;
230 /* Add active regions with valid PFNs. */
231 for_each_memblock(memory, reg) {
232 unsigned long start_pfn, end_pfn;
233 start_pfn = memblock_region_memory_base_pfn(reg);
234 end_pfn = memblock_region_memory_end_pfn(reg);
235 __add_active_range(0, start_pfn, end_pfn);
238 /* All of system RAM sits in node 0 for the non-NUMA case */
247 static void __init early_reserve_mem(void)
249 unsigned long start_pfn;
250 u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
251 u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
254 * Partially used pages are not usable - thus
255 * we are rounding upwards:
257 start_pfn = PFN_UP(__pa(_end));
260 * Reserve the kernel text and Reserve the bootmem bitmap. We do
261 * this in two steps (first step was init_bootmem()), because
262 * this catches the (definitely buggy) case of us accidentally
263 * initializing the bootmem allocator with an invalid RAM area.
265 memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
268 * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
270 if (CONFIG_ZERO_PAGE_OFFSET != 0)
271 memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
274 * Handle additional early reservations
277 reserve_crashkernel();
280 void __init paging_init(void)
282 unsigned long max_zone_pfns[MAX_NR_ZONES];
283 unsigned long vaddr, end;
290 * Once the early reservations are out of the way, give the
291 * platforms a chance to kick out some memory.
293 if (sh_mv.mv_mem_reserve)
294 sh_mv.mv_mem_reserve();
296 memblock_enforce_memory_limit(memory_limit);
297 memblock_allow_resize();
302 * Determine low and high memory ranges:
304 max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
305 min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
307 nodes_clear(node_online_map);
309 memory_start = (unsigned long)__va(__MEMORY_START);
310 memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
315 ioremap_fixed_init();
317 /* We don't need to map the kernel through the TLB, as
318 * it is permanatly mapped using P1. So clear the
320 memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
322 /* Set an initial value for the MMU.TTB so we don't have to
323 * check for a null value. */
324 set_TTB(swapper_pg_dir);
327 * Populate the relevant portions of swapper_pg_dir so that
328 * we can use the fixmap entries without calling kmalloc.
329 * pte's will be filled in by __set_fixmap().
331 vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
332 end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
333 page_table_range_init(vaddr, end, swapper_pg_dir);
335 kmap_coherent_init();
337 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
338 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
339 free_area_init(max_zone_pfns);
342 unsigned int mem_init_done = 0;
344 void __init mem_init(void)
349 for_each_online_pgdat(pgdat)
350 high_memory = max_t(void *, high_memory,
351 __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
355 /* Set this up early, so we can take care of the zero page */
358 /* clear the zero-page */
359 memset(empty_zero_page, 0, PAGE_SIZE);
360 __flush_wback_region(empty_zero_page, PAGE_SIZE);
364 mem_init_print_info(NULL);
365 pr_info("virtual kernel memory layout:\n"
366 " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
367 #ifdef CONFIG_HIGHMEM
368 " pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
370 " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
371 " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
372 #ifdef CONFIG_UNCACHED_MAPPING
373 " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
375 " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
376 " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
377 " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
378 FIXADDR_START, FIXADDR_TOP,
379 (FIXADDR_TOP - FIXADDR_START) >> 10,
381 #ifdef CONFIG_HIGHMEM
382 PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
383 (LAST_PKMAP*PAGE_SIZE) >> 10,
386 (unsigned long)VMALLOC_START, VMALLOC_END,
387 (VMALLOC_END - VMALLOC_START) >> 20,
389 (unsigned long)memory_start, (unsigned long)high_memory,
390 ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
392 #ifdef CONFIG_UNCACHED_MAPPING
393 uncached_start, uncached_end, uncached_size >> 20,
396 (unsigned long)&__init_begin, (unsigned long)&__init_end,
397 ((unsigned long)&__init_end -
398 (unsigned long)&__init_begin) >> 10,
400 (unsigned long)&_etext, (unsigned long)&_edata,
401 ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
403 (unsigned long)&_text, (unsigned long)&_etext,
404 ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
409 #ifdef CONFIG_MEMORY_HOTPLUG
410 int arch_add_memory(int nid, u64 start, u64 size,
411 struct mhp_params *params)
413 unsigned long start_pfn = PFN_DOWN(start);
414 unsigned long nr_pages = size >> PAGE_SHIFT;
417 if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
420 /* We only have ZONE_NORMAL, so this is easy.. */
421 ret = __add_pages(nid, start_pfn, nr_pages, params);
423 printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
429 int memory_add_physaddr_to_nid(u64 addr)
431 /* Node 0 for now.. */
434 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
437 void arch_remove_memory(int nid, u64 start, u64 size,
438 struct vmem_altmap *altmap)
440 unsigned long start_pfn = PFN_DOWN(start);
441 unsigned long nr_pages = size >> PAGE_SHIFT;
443 __remove_pages(start_pfn, nr_pages, altmap);
445 #endif /* CONFIG_MEMORY_HOTPLUG */