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 28 #include <asm/asm-offsets.h> 29 #include <asm/bootinfo.h> 30 #include <asm/cpu.h> 31 #include <asm/dma.h> 32 #include <asm/mmu_context.h> 33 #include <asm/sections.h> 34 #include <asm/pgtable.h> 35 #include <asm/pgalloc.h> 36 #include <asm/tlb.h> 37 38 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; 39 EXPORT_SYMBOL(empty_zero_page); 40 41 void copy_user_highpage(struct page *to, struct page *from, 42 unsigned long vaddr, struct vm_area_struct *vma) 43 { 44 void *vfrom, *vto; 45 46 vfrom = kmap_local_page(from); 47 vto = kmap_local_page(to); 48 copy_page(vto, vfrom); 49 kunmap_local(vfrom); 50 kunmap_local(vto); 51 /* Make sure this page is cleared on other CPU's too before using it */ 52 smp_wmb(); 53 } 54 55 int __ref page_is_ram(unsigned long pfn) 56 { 57 unsigned long addr = PFN_PHYS(pfn); 58 59 return memblock_is_memory(addr) && !memblock_is_reserved(addr); 60 } 61 62 #ifndef CONFIG_NUMA 63 void __init paging_init(void) 64 { 65 unsigned long max_zone_pfns[MAX_NR_ZONES]; 66 67 #ifdef CONFIG_ZONE_DMA 68 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN; 69 #endif 70 #ifdef CONFIG_ZONE_DMA32 71 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN; 72 #endif 73 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 74 75 free_area_init(max_zone_pfns); 76 } 77 78 void __init mem_init(void) 79 { 80 max_mapnr = max_low_pfn; 81 high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); 82 83 memblock_free_all(); 84 } 85 #endif /* !CONFIG_NUMA */ 86 87 void __ref free_initmem(void) 88 { 89 free_initmem_default(POISON_FREE_INITMEM); 90 } 91 92 #ifdef CONFIG_MEMORY_HOTPLUG 93 int arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) 94 { 95 unsigned long start_pfn = start >> PAGE_SHIFT; 96 unsigned long nr_pages = size >> PAGE_SHIFT; 97 int ret; 98 99 ret = __add_pages(nid, start_pfn, nr_pages, params); 100 101 if (ret) 102 pr_warn("%s: Problem encountered in __add_pages() as ret=%d\n", 103 __func__, ret); 104 105 return ret; 106 } 107 108 void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) 109 { 110 unsigned long start_pfn = start >> PAGE_SHIFT; 111 unsigned long nr_pages = size >> PAGE_SHIFT; 112 struct page *page = pfn_to_page(start_pfn); 113 114 /* With altmap the first mapped page is offset from @start */ 115 if (altmap) 116 page += vmem_altmap_offset(altmap); 117 __remove_pages(start_pfn, nr_pages, altmap); 118 } 119 120 #ifdef CONFIG_NUMA 121 int memory_add_physaddr_to_nid(u64 start) 122 { 123 return pa_to_nid(start); 124 } 125 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 126 #endif 127 #endif 128 129 #ifdef CONFIG_SPARSEMEM_VMEMMAP 130 void __meminit vmemmap_set_pmd(pmd_t *pmd, void *p, int node, 131 unsigned long addr, unsigned long next) 132 { 133 pmd_t entry; 134 135 entry = pfn_pmd(virt_to_pfn(p), PAGE_KERNEL); 136 pmd_val(entry) |= _PAGE_HUGE | _PAGE_HGLOBAL; 137 set_pmd_at(&init_mm, addr, pmd, entry); 138 } 139 140 int __meminit vmemmap_check_pmd(pmd_t *pmd, int node, 141 unsigned long addr, unsigned long next) 142 { 143 int huge = pmd_val(*pmd) & _PAGE_HUGE; 144 145 if (huge) 146 vmemmap_verify((pte_t *)pmd, node, addr, next); 147 148 return huge; 149 } 150 151 int __meminit vmemmap_populate(unsigned long start, unsigned long end, 152 int node, struct vmem_altmap *altmap) 153 { 154 #if CONFIG_PGTABLE_LEVELS == 2 155 return vmemmap_populate_basepages(start, end, node, NULL); 156 #else 157 return vmemmap_populate_hugepages(start, end, node, NULL); 158 #endif 159 } 160 161 #ifdef CONFIG_MEMORY_HOTPLUG 162 void vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 163 { 164 } 165 #endif 166 #endif 167 168 pte_t * __init populate_kernel_pte(unsigned long addr) 169 { 170 pgd_t *pgd = pgd_offset_k(addr); 171 p4d_t *p4d = p4d_offset(pgd, addr); 172 pud_t *pud; 173 pmd_t *pmd; 174 175 if (p4d_none(*p4d)) { 176 pud = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 177 if (!pud) 178 panic("%s: Failed to allocate memory\n", __func__); 179 p4d_populate(&init_mm, p4d, pud); 180 #ifndef __PAGETABLE_PUD_FOLDED 181 pud_init(pud); 182 #endif 183 } 184 185 pud = pud_offset(p4d, addr); 186 if (pud_none(*pud)) { 187 pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 188 if (!pmd) 189 panic("%s: Failed to allocate memory\n", __func__); 190 pud_populate(&init_mm, pud, pmd); 191 #ifndef __PAGETABLE_PMD_FOLDED 192 pmd_init(pmd); 193 #endif 194 } 195 196 pmd = pmd_offset(pud, addr); 197 if (!pmd_present(*pmd)) { 198 pte_t *pte; 199 200 pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); 201 if (!pte) 202 panic("%s: Failed to allocate memory\n", __func__); 203 pmd_populate_kernel(&init_mm, pmd, pte); 204 } 205 206 return pte_offset_kernel(pmd, addr); 207 } 208 209 void __init __set_fixmap(enum fixed_addresses idx, 210 phys_addr_t phys, pgprot_t flags) 211 { 212 unsigned long addr = __fix_to_virt(idx); 213 pte_t *ptep; 214 215 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 216 217 ptep = populate_kernel_pte(addr); 218 if (!pte_none(*ptep)) { 219 pte_ERROR(*ptep); 220 return; 221 } 222 223 if (pgprot_val(flags)) 224 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, flags)); 225 else { 226 pte_clear(&init_mm, addr, ptep); 227 flush_tlb_kernel_range(addr, addr + PAGE_SIZE); 228 } 229 } 230 231 /* 232 * Align swapper_pg_dir in to 64K, allows its address to be loaded 233 * with a single LUI instruction in the TLB handlers. If we used 234 * __aligned(64K), its size would get rounded up to the alignment 235 * size, and waste space. So we place it in its own section and align 236 * it in the linker script. 237 */ 238 pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(".bss..swapper_pg_dir"); 239 240 pgd_t invalid_pg_dir[_PTRS_PER_PGD] __page_aligned_bss; 241 #ifndef __PAGETABLE_PUD_FOLDED 242 pud_t invalid_pud_table[PTRS_PER_PUD] __page_aligned_bss; 243 EXPORT_SYMBOL(invalid_pud_table); 244 #endif 245 #ifndef __PAGETABLE_PMD_FOLDED 246 pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss; 247 EXPORT_SYMBOL(invalid_pmd_table); 248 #endif 249 pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; 250 EXPORT_SYMBOL(invalid_pte_table); 251