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 struct dev_pagemap *pgmap) 124 { 125 unsigned long start_pfn = start >> PAGE_SHIFT; 126 unsigned long nr_pages = size >> PAGE_SHIFT; 127 128 __remove_pages(start_pfn, nr_pages, altmap, pgmap); 129 } 130 #endif 131 132 #ifdef CONFIG_SPARSEMEM_VMEMMAP 133 void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, 134 unsigned long addr, unsigned long next) 135 { 136 pmd_t entry; 137 138 entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL); 139 pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL; 140 set_pmd_at(&init_mm, addr, pmd, entry); 141 } 142 143 int __meminit vmemmap_populate(unsigned long start, unsigned long end, 144 int node, struct vmem_altmap *altmap) 145 { 146 #if CONFIG_PGTABLE_LEVELS == 2 147 return vmemmap_populate_basepages(start, end, node, NULL); 148 #else 149 return vmemmap_populate_hugepages(start, end, node, NULL); 150 #endif 151 } 152 153 #ifdef CONFIG_MEMORY_HOTPLUG 154 void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 155 { 156 } 157 #endif 158 #endif 159 160 pte_t * __init populate_kernel_pte(unsigned long addr) 161 { 162 pgd_t *pgd = pgd_offset_k(addr); 163 p4d_t *p4d = p4d_offset(pgd, addr); 164 pud_t *pud; 165 pmd_t *pmd; 166 167 if (p4d_none(p4dp_get(p4d))) { 168 pud = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 169 p4d_populate(&init_mm, p4d, pud); 170 #ifndef __PAGETABLE_PUD_FOLDED 171 pud_init(pud); 172 #endif 173 } 174 175 pud = pud_offset(p4d, addr); 176 if (pud_none(pudp_get(pud))) { 177 pmd = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 178 pud_populate(&init_mm, pud, pmd); 179 #ifndef __PAGETABLE_PMD_FOLDED 180 pmd_init(pmd); 181 #endif 182 } 183 184 pmd = pmd_offset(pud, addr); 185 if (!pmd_present(pmdp_get(pmd))) { 186 pte_t *pte; 187 188 pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 189 pmd_populate_kernel(&init_mm, pmd, pte); 190 kernel_pte_init(pte); 191 } 192 193 return pte_offset_kernel(pmd, addr); 194 } 195 196 void __init __set_fixmap(enum fixed_addresses idx, 197 phys_addr_t phys, pgprot_t flags) 198 { 199 unsigned long addr = __fix_to_virt(idx); 200 pte_t *ptep; 201 202 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 203 204 ptep = populate_kernel_pte(addr); 205 if (!pte_none(ptep_get(ptep))) { 206 pte_ERROR(*ptep); 207 return; 208 } 209 210 if (pgprot_val(flags)) 211 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags)); 212 else { 213 pte_clear(&init_mm, addr, ptep); 214 flush_tlb_kernel_range(addr, addr + PAGE_SIZE); 215 } 216 } 217 218 /* 219 * Align swapper_pg_dir in to 64K, allows its address to be loaded 220 * with a single LUI instruction in the TLB handlers. If we used 221 * __aligned(64K), its size would get rounded up to the alignment 222 * size, and waste space. So we place it in its own section and align 223 * it in the linker script. 224 */ 225 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); 226 227 pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss; 228 #ifndef __PAGETABLE_PUD_FOLDED 229 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss; 230 EXPORT_SYMBOL(invalid_pud_table); 231 #endif 232 #ifndef __PAGETABLE_PMD_FOLDED 233 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; 234 EXPORT_SYMBOL(invalid_pmd_table); 235 #endif 236 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; 237 EXPORT_SYMBOL(invalid_pte_table); 238 239 #if defined(CONFIG_EXECMEM) && defined(MODULES_VADDR) 240 static struct execmem_info execmem_info __ro_after_init; 241 242 struct execmem_info __init *execmem_arch_setup(void) 243 { 244 execmem_info = (struct execmem_info){ 245 .ranges = { 246 [EXECMEM_DEFAULT] = { 247 .start = MODULES_VADDR, 248 .end = MODULES_END, 249 .pgprot = PAGE_KERNEL, 250 .alignment = 1, 251 }, 252 }, 253 }; 254 255 return &execmem_info; 256 } 257 #endif /* CONFIG_EXECMEM && MODULES_VADDR */ 258