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 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; 40 EXPORT_SYMBOL(empty_zero_page); 41 42 void copy_user_highpage(struct page *to, struct page *from, 43 unsigned long vaddr, struct vm_area_struct *vma) 44 { 45 void *vfrom, *vto; 46 47 vfrom = kmap_local_page(from); 48 vto = kmap_local_page(to); 49 copy_page(vto, vfrom); 50 kunmap_local(vfrom); 51 kunmap_local(vto); 52 /* Make sure this page is cleared on other CPU's too before using it */ 53 smp_wmb(); 54 } 55 56 int __ref page_is_ram(unsigned long pfn) 57 { 58 unsigned long addr = PFN_PHYS(pfn); 59 60 return memblock_is_memory(addr) && !memblock_is_reserved(addr); 61 } 62 63 #ifndef CONFIG_NUMA 64 void __init paging_init(void) 65 { 66 unsigned long max_zone_pfns[MAX_NR_ZONES]; 67 68 #ifdef CONFIG_ZONE_DMA 69 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; 70 #endif 71 #ifdef CONFIG_ZONE_DMA32 72 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 73 #endif 74 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 75 76 free_area_init(max_zone_pfns); 77 } 78 #endif /* !CONFIG_NUMA */ 79 80 void __ref free_initmem(void) 81 { 82 free_initmem_default(POISON_FREE_INITMEM); 83 } 84 85 #ifdef CONFIG_MEMORY_HOTPLUG 86 int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) 87 { 88 unsigned long start_pfn = start >> PAGE_SHIFT; 89 unsigned long nr_pages = size >> PAGE_SHIFT; 90 int ret; 91 92 ret = __add_pages(nid, start_pfn, nr_pages, params); 93 94 if (ret) 95 pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n", 96 __func__, ret); 97 98 return ret; 99 } 100 101 void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 102 { 103 unsigned long start_pfn = start >> PAGE_SHIFT; 104 unsigned long nr_pages = size >> PAGE_SHIFT; 105 struct page *page = pfn_to_page(start_pfn); 106 107 /* With altmap the first mapped page is offset from @start */ 108 if (altmap) 109 page += vmem_altmap_offset(altmap); 110 __remove_pages(start_pfn, nr_pages, altmap); 111 } 112 113 #ifdef CONFIG_NUMA 114 int memory_add_physaddr_to_nid(u64 start) 115 { 116 return pa_to_nid(start); 117 } 118 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 119 #endif 120 #endif 121 122 #ifdef CONFIG_SPARSEMEM_VMEMMAP 123 void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, 124 unsigned long addr, unsigned long next) 125 { 126 pmd_t entry; 127 128 entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL); 129 pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL; 130 set_pmd_at(&init_mm, addr, pmd, entry); 131 } 132 133 int __meminit vmemmap_check_pmd(pmd_t *pmd, int node, 134 unsigned long addr, unsigned long next) 135 { 136 int huge = pmd_val(pmdp_get(pmd)) & _PAGE_HUGE; 137 138 if (huge) 139 vmemmap_verify((pte_t *)pmd, node, addr, next); 140 141 return huge; 142 } 143 144 int __meminit vmemmap_populate(unsigned long start, unsigned long end, 145 int node, struct vmem_altmap *altmap) 146 { 147 #if CONFIG_PGTABLE_LEVELS == 2 148 return vmemmap_populate_basepages(start, end, node, NULL); 149 #else 150 return vmemmap_populate_hugepages(start, end, node, NULL); 151 #endif 152 } 153 154 #ifdef CONFIG_MEMORY_HOTPLUG 155 void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 156 { 157 } 158 #endif 159 #endif 160 161 pte_t * __init populate_kernel_pte(unsigned long addr) 162 { 163 pgd_t *pgd = pgd_offset_k(addr); 164 p4d_t *p4d = p4d_offset(pgd, addr); 165 pud_t *pud; 166 pmd_t *pmd; 167 168 if (p4d_none(p4dp_get(p4d))) { 169 pud = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 170 p4d_populate(&init_mm, p4d, pud); 171 #ifndef __PAGETABLE_PUD_FOLDED 172 pud_init(pud); 173 #endif 174 } 175 176 pud = pud_offset(p4d, addr); 177 if (pud_none(pudp_get(pud))) { 178 pmd = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 179 pud_populate(&init_mm, pud, pmd); 180 #ifndef __PAGETABLE_PMD_FOLDED 181 pmd_init(pmd); 182 #endif 183 } 184 185 pmd = pmd_offset(pud, addr); 186 if (!pmd_present(pmdp_get(pmd))) { 187 pte_t *pte; 188 189 pte = memblock_alloc_or_panic(PAGE_SIZE, PAGE_SIZE); 190 pmd_populate_kernel(&init_mm, pmd, pte); 191 kernel_pte_init(pte); 192 } 193 194 return pte_offset_kernel(pmd, addr); 195 } 196 197 void __init __set_fixmap(enum fixed_addresses idx, 198 phys_addr_t phys, pgprot_t flags) 199 { 200 unsigned long addr = __fix_to_virt(idx); 201 pte_t *ptep; 202 203 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 204 205 ptep = populate_kernel_pte(addr); 206 if (!pte_none(ptep_get(ptep))) { 207 pte_ERROR(*ptep); 208 return; 209 } 210 211 if (pgprot_val(flags)) 212 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags)); 213 else { 214 pte_clear(&init_mm, addr, ptep); 215 flush_tlb_kernel_range(addr, addr + PAGE_SIZE); 216 } 217 } 218 219 /* 220 * Align swapper_pg_dir in to 64K, allows its address to be loaded 221 * with a single LUI instruction in the TLB handlers. If we used 222 * __aligned(64K), its size would get rounded up to the alignment 223 * size, and waste space. So we place it in its own section and align 224 * it in the linker script. 225 */ 226 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); 227 228 pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss; 229 #ifndef __PAGETABLE_PUD_FOLDED 230 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss; 231 EXPORT_SYMBOL(invalid_pud_table); 232 #endif 233 #ifndef __PAGETABLE_PMD_FOLDED 234 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; 235 EXPORT_SYMBOL(invalid_pmd_table); 236 #endif 237 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; 238 EXPORT_SYMBOL(invalid_pte_table); 239 240 #ifdef CONFIG_EXECMEM 241 static struct execmem_info execmem_info __ro_after_init; 242 243 struct execmem_info __init *execmem_arch_setup(void) 244 { 245 execmem_info = (struct execmem_info){ 246 .ranges = { 247 [EXECMEM_DEFAULT] = { 248 .start = MODULES_VADDR, 249 .end = MODULES_END, 250 .pgprot = PAGE_KERNEL, 251 .alignment = 1, 252 }, 253 }, 254 }; 255 256 return &execmem_info; 257 } 258 #endif /* CONFIG_EXECMEM */ 259