1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #include <linux/init.h> 6 #include <linux/export.h> 7 #include <linux/signal.h> 8 #include <linux/sched.h> 9 #include <linux/smp.h> 10 #include <linux/kernel.h> 11 #include <linux/errno.h> 12 #include <linux/string.h> 13 #include <linux/types.h> 14 #include <linux/pagemap.h> 15 #include <linux/memblock.h> 16 #include <linux/memremap.h> 17 #include <linux/mm.h> 18 #include <linux/mman.h> 19 #include <linux/highmem.h> 20 #include <linux/swap.h> 21 #include <linux/proc_fs.h> 22 #include <linux/pfn.h> 23 #include <linux/hardirq.h> 24 #include <linux/gfp.h> 25 #include <linux/hugetlb.h> 26 #include <linux/mmzone.h> 27 #include <linux/execmem.h> 28 29 #include <asm/asm-offsets.h> 30 #include <asm/bootinfo.h> 31 #include <asm/cpu.h> 32 #include <asm/dma.h> 33 #include <asm/mmu_context.h> 34 #include <asm/sections.h> 35 #include <asm/pgtable.h> 36 #include <asm/pgalloc.h> 37 #include <asm/tlb.h> 38 39 int __ref page_is_ram(unsigned long pfn) 40 { 41 unsigned long addr = PFN_PHYS(pfn); 42 43 return memblock_is_memory(addr) && !memblock_is_reserved(addr); 44 } 45 46 void __init arch_zone_limits_init(unsigned long *max_zone_pfns) 47 { 48 #ifdef CONFIG_ZONE_DMA32 49 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 50 #endif 51 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 52 #ifdef CONFIG_HIGHMEM 53 max_zone_pfns[ZONE_HIGHMEM] = max_pfn; 54 #endif 55 } 56 57 void __ref free_initmem(void) 58 { 59 free_initmem_default(POISON_FREE_INITMEM); 60 } 61 62 #ifdef CONFIG_HIGHMEM 63 64 void __init fixrange_init(unsigned long start, unsigned long end, pgd_t *pgd_base) 65 { 66 pgd_t *pgd; 67 pud_t *pud; 68 pmd_t *pmd; 69 pte_t *pte; 70 int i, j, k; 71 int ptrs_per_pgd; 72 unsigned long vaddr; 73 74 vaddr = start; 75 i = pgd_index(vaddr); 76 j = pud_index(vaddr); 77 k = pmd_index(vaddr); 78 pgd = pgd_base + i; 79 ptrs_per_pgd = min((1 << (BITS_PER_LONG - PGDIR_SHIFT)), PTRS_PER_PGD); 80 81 for ( ; (i < ptrs_per_pgd) && (vaddr < end); pgd++, i++) { 82 pud = (pud_t *)pgd; 83 for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) { 84 pmd = (pmd_t *)pud; 85 for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) { 86 if (pmd_none(*pmd)) { 87 pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE); 88 if (!pte) 89 panic("%s: Failed to allocate %lu bytes align=%lx\n", 90 __func__, PAGE_SIZE, PAGE_SIZE); 91 92 kernel_pte_init(pte); 93 set_pmd(pmd, __pmd((unsigned long)pte)); 94 BUG_ON(pte != pte_offset_kernel(pmd, 0)); 95 } 96 vaddr += PMD_SIZE; 97 } 98 k = 0; 99 } 100 j = 0; 101 } 102 } 103 104 #endif 105 106 #ifdef CONFIG_MEMORY_HOTPLUG 107 int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) 108 { 109 unsigned long start_pfn = start >> PAGE_SHIFT; 110 unsigned long nr_pages = size >> PAGE_SHIFT; 111 int ret; 112 113 ret = __add_pages(nid, start_pfn, nr_pages, params); 114 115 if (ret) 116 pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n", 117 __func__, ret); 118 119 return ret; 120 } 121 122 void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 123 { 124 unsigned long start_pfn = start >> PAGE_SHIFT; 125 unsigned long nr_pages = size >> PAGE_SHIFT; 126 struct page *page = pfn_to_page(start_pfn); 127 128 /* With altmap the first mapped page is offset from @start */ 129 if (altmap) 130 page += vmem_altmap_offset(altmap); 131 __remove_pages(start_pfn, nr_pages, altmap); 132 } 133 #endif 134 135 #ifdef CONFIG_SPARSEMEM_VMEMMAP 136 void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, 137 unsigned long addr, unsigned long next) 138 { 139 pmd_t entry; 140 141 entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL); 142 pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL; 143 set_pmd_at(&init_mm, addr, pmd, entry); 144 } 145 146 int __meminit vmemmap_check_pmd(pmd_t *pmd, int node, 147 unsigned long addr, unsigned long next) 148 { 149 int huge = pmd_val(pmdp_get(pmd)) & _PAGE_HUGE; 150 151 if (huge) 152 vmemmap_verify((pte_t *)pmd, node, addr, next); 153 154 return huge; 155 } 156 157 int __meminit vmemmap_populate(unsigned long start, unsigned long end, 158 int node, struct vmem_altmap *altmap) 159 { 160 #if CONFIG_PGTABLE_LEVELS == 2 161 return vmemmap_populate_basepages(start, end, node, NULL); 162 #else 163 return vmemmap_populate_hugepages(start, end, node, NULL); 164 #endif 165 } 166 167 #ifdef CONFIG_MEMORY_HOTPLUG 168 void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 169 { 170 } 171 #endif 172 #endif 173 174 pte_t * __init populate_kernel_pte(unsigned long addr) 175 { 176 pgd_t *pgd = pgd_offset_k(addr); 177 p4d_t *p4d = p4d_offset(pgd, addr); 178 pud_t *pud; 179 pmd_t *pmd; 180 181 if (p4d_none(p4dp_get(p4d))) { 182 pud = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 183 p4d_populate(&init_mm, p4d, pud); 184 #ifndef __PAGETABLE_PUD_FOLDED 185 pud_init(pud); 186 #endif 187 } 188 189 pud = pud_offset(p4d, addr); 190 if (pud_none(pudp_get(pud))) { 191 pmd = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 192 pud_populate(&init_mm, pud, pmd); 193 #ifndef __PAGETABLE_PMD_FOLDED 194 pmd_init(pmd); 195 #endif 196 } 197 198 pmd = pmd_offset(pud, addr); 199 if (!pmd_present(pmdp_get(pmd))) { 200 pte_t *pte; 201 202 pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 203 pmd_populate_kernel(&init_mm, pmd, pte); 204 kernel_pte_init(pte); 205 } 206 207 return pte_offset_kernel(pmd, addr); 208 } 209 210 void __init __set_fixmap(enum fixed_addresses idx, 211 phys_addr_t phys, pgprot_t flags) 212 { 213 unsigned long addr = __fix_to_virt(idx); 214 pte_t *ptep; 215 216 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 217 218 ptep = populate_kernel_pte(addr); 219 if (!pte_none(ptep_get(ptep))) { 220 pte_ERROR(*ptep); 221 return; 222 } 223 224 if (pgprot_val(flags)) 225 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags)); 226 else { 227 pte_clear(&init_mm, addr, ptep); 228 flush_tlb_kernel_range(addr, addr + PAGE_SIZE); 229 } 230 } 231 232 /* 233 * Align swapper_pg_dir in to 64K, allows its address to be loaded 234 * with a single LUI instruction in the TLB handlers. If we used 235 * __aligned(64K), its size would get rounded up to the alignment 236 * size, and waste space. So we place it in its own section and align 237 * it in the linker script. 238 */ 239 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); 240 241 pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss; 242 #ifndef __PAGETABLE_PUD_FOLDED 243 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss; 244 EXPORT_SYMBOL(invalid_pud_table); 245 #endif 246 #ifndef __PAGETABLE_PMD_FOLDED 247 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; 248 EXPORT_SYMBOL(invalid_pmd_table); 249 #endif 250 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; 251 EXPORT_SYMBOL(invalid_pte_table); 252 253 #if defined(CONFIG_EXECMEM) && defined(MODULES_VADDR) 254 static struct execmem_info execmem_info __ro_after_init; 255 256 struct execmem_info __init *execmem_arch_setup(void) 257 { 258 execmem_info = (struct execmem_info){ 259 .ranges = { 260 [EXECMEM_DEFAULT] = { 261 .start = MODULES_VADDR, 262 .end = MODULES_END, 263 .pgprot = PAGE_KERNEL, 264 .alignment = 1, 265 }, 266 }, 267 }; 268 269 return &execmem_info; 270 } 271 #endif /* CONFIG_EXECMEM && MODULES_VADDR */ 272