150acfb2bSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 276d2a049SPalmer Dabbelt /* 376d2a049SPalmer Dabbelt * Copyright (C) 2012 Regents of the University of California 4671f9a3eSAnup Patel * Copyright (C) 2019 Western Digital Corporation or its affiliates. 5*e53d2818SNick Kossifidis * Copyright (C) 2020 FORTH-ICS/CARV 6*e53d2818SNick Kossifidis * Nick Kossifidis <mick@ics.forth.gr> 776d2a049SPalmer Dabbelt */ 876d2a049SPalmer Dabbelt 976d2a049SPalmer Dabbelt #include <linux/init.h> 1076d2a049SPalmer Dabbelt #include <linux/mm.h> 1176d2a049SPalmer Dabbelt #include <linux/memblock.h> 1257c8a661SMike Rapoport #include <linux/initrd.h> 1376d2a049SPalmer Dabbelt #include <linux/swap.h> 145ec9c4ffSChristoph Hellwig #include <linux/sizes.h> 150651c263SAnup Patel #include <linux/of_fdt.h> 16922b0375SAlbert Ou #include <linux/libfdt.h> 17d27c3c90SZong Li #include <linux/set_memory.h> 18da815582SKefeng Wang #include <linux/dma-map-ops.h> 19*e53d2818SNick Kossifidis #include <linux/crash_dump.h> 2076d2a049SPalmer Dabbelt 21f2c17aabSAnup Patel #include <asm/fixmap.h> 2276d2a049SPalmer Dabbelt #include <asm/tlbflush.h> 2376d2a049SPalmer Dabbelt #include <asm/sections.h> 242d268251SPalmer Dabbelt #include <asm/soc.h> 2576d2a049SPalmer Dabbelt #include <asm/io.h> 26b422d28bSZong Li #include <asm/ptdump.h> 274f0e8eefSAtish Patra #include <asm/numa.h> 2876d2a049SPalmer Dabbelt 29ffaee272SPaul Walmsley #include "../kernel/head.h" 30ffaee272SPaul Walmsley 312bfc6cd8SAlexandre Ghiti unsigned long kernel_virt_addr = KERNEL_LINK_ADDR; 322bfc6cd8SAlexandre Ghiti EXPORT_SYMBOL(kernel_virt_addr); 332bfc6cd8SAlexandre Ghiti 34387181dcSAnup Patel unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 35387181dcSAnup Patel __page_aligned_bss; 36387181dcSAnup Patel EXPORT_SYMBOL(empty_zero_page); 37387181dcSAnup Patel 38d90d45d7SAnup Patel extern char _start[]; 398f3a2b4aSAnup Patel #define DTB_EARLY_BASE_VA PGDIR_SIZE 408f3a2b4aSAnup Patel void *dtb_early_va __initdata; 418f3a2b4aSAnup Patel uintptr_t dtb_early_pa __initdata; 42d90d45d7SAnup Patel 43e8dcb61fSAtish Patra struct pt_alloc_ops { 44e8dcb61fSAtish Patra pte_t *(*get_pte_virt)(phys_addr_t pa); 45e8dcb61fSAtish Patra phys_addr_t (*alloc_pte)(uintptr_t va); 46e8dcb61fSAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 47e8dcb61fSAtish Patra pmd_t *(*get_pmd_virt)(phys_addr_t pa); 48e8dcb61fSAtish Patra phys_addr_t (*alloc_pmd)(uintptr_t va); 49e8dcb61fSAtish Patra #endif 50e8dcb61fSAtish Patra }; 5176d2a049SPalmer Dabbelt 52da815582SKefeng Wang static phys_addr_t dma32_phys_limit __ro_after_init; 53da815582SKefeng Wang 5476d2a049SPalmer Dabbelt static void __init zone_sizes_init(void) 5576d2a049SPalmer Dabbelt { 565ec9c4ffSChristoph Hellwig unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 5776d2a049SPalmer Dabbelt 58d5fad48cSZong Li #ifdef CONFIG_ZONE_DMA32 59da815582SKefeng Wang max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 60d5fad48cSZong Li #endif 615ec9c4ffSChristoph Hellwig max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 625ec9c4ffSChristoph Hellwig 639691a071SMike Rapoport free_area_init(max_zone_pfns); 6476d2a049SPalmer Dabbelt } 6576d2a049SPalmer Dabbelt 661987501bSJisheng Zhang static void __init setup_zero_page(void) 6776d2a049SPalmer Dabbelt { 6876d2a049SPalmer Dabbelt memset((void *)empty_zero_page, 0, PAGE_SIZE); 6976d2a049SPalmer Dabbelt } 7076d2a049SPalmer Dabbelt 718fa3cdffSKefeng Wang #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 722cc6c4a0SYash Shah static inline void print_mlk(char *name, unsigned long b, unsigned long t) 732cc6c4a0SYash Shah { 742cc6c4a0SYash Shah pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 752cc6c4a0SYash Shah (((t) - (b)) >> 10)); 762cc6c4a0SYash Shah } 772cc6c4a0SYash Shah 782cc6c4a0SYash Shah static inline void print_mlm(char *name, unsigned long b, unsigned long t) 792cc6c4a0SYash Shah { 802cc6c4a0SYash Shah pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 812cc6c4a0SYash Shah (((t) - (b)) >> 20)); 822cc6c4a0SYash Shah } 832cc6c4a0SYash Shah 841987501bSJisheng Zhang static void __init print_vm_layout(void) 852cc6c4a0SYash Shah { 862cc6c4a0SYash Shah pr_notice("Virtual kernel memory layout:\n"); 872cc6c4a0SYash Shah print_mlk("fixmap", (unsigned long)FIXADDR_START, 882cc6c4a0SYash Shah (unsigned long)FIXADDR_TOP); 892cc6c4a0SYash Shah print_mlm("pci io", (unsigned long)PCI_IO_START, 902cc6c4a0SYash Shah (unsigned long)PCI_IO_END); 912cc6c4a0SYash Shah print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 922cc6c4a0SYash Shah (unsigned long)VMEMMAP_END); 932cc6c4a0SYash Shah print_mlm("vmalloc", (unsigned long)VMALLOC_START, 942cc6c4a0SYash Shah (unsigned long)VMALLOC_END); 952cc6c4a0SYash Shah print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 962cc6c4a0SYash Shah (unsigned long)high_memory); 972bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 982bfc6cd8SAlexandre Ghiti print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR, 992bfc6cd8SAlexandre Ghiti (unsigned long)ADDRESS_SPACE_END); 1002bfc6cd8SAlexandre Ghiti #endif 1012cc6c4a0SYash Shah } 1022cc6c4a0SYash Shah #else 1032cc6c4a0SYash Shah static void print_vm_layout(void) { } 1042cc6c4a0SYash Shah #endif /* CONFIG_DEBUG_VM */ 1052cc6c4a0SYash Shah 10676d2a049SPalmer Dabbelt void __init mem_init(void) 10776d2a049SPalmer Dabbelt { 10876d2a049SPalmer Dabbelt #ifdef CONFIG_FLATMEM 10976d2a049SPalmer Dabbelt BUG_ON(!mem_map); 11076d2a049SPalmer Dabbelt #endif /* CONFIG_FLATMEM */ 11176d2a049SPalmer Dabbelt 11276d2a049SPalmer Dabbelt high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 113c6ffc5caSMike Rapoport memblock_free_all(); 11476d2a049SPalmer Dabbelt 11576d2a049SPalmer Dabbelt mem_init_print_info(NULL); 1162cc6c4a0SYash Shah print_vm_layout(); 11776d2a049SPalmer Dabbelt } 11876d2a049SPalmer Dabbelt 1190651c263SAnup Patel void __init setup_bootmem(void) 1200651c263SAnup Patel { 121ac51e005SZong Li phys_addr_t vmlinux_end = __pa_symbol(&_end); 122ac51e005SZong Li phys_addr_t vmlinux_start = __pa_symbol(&_start); 123dd2d082bSKefeng Wang phys_addr_t dram_end = memblock_end_of_DRAM(); 124abb8e86bSAtish Patra phys_addr_t max_mapped_addr = __pa(~(ulong)0); 1250651c263SAnup Patel 126dd2d082bSKefeng Wang /* The maximal physical memory size is -PAGE_OFFSET. */ 127de043da0SAtish Patra memblock_enforce_memory_limit(-PAGE_OFFSET); 1280651c263SAnup Patel 1292bfc6cd8SAlexandre Ghiti /* 1302bfc6cd8SAlexandre Ghiti * Reserve from the start of the kernel to the end of the kernel 1312bfc6cd8SAlexandre Ghiti * and make sure we align the reservation on PMD_SIZE since we will 1322bfc6cd8SAlexandre Ghiti * map the kernel in the linear mapping as read-only: we do not want 1332bfc6cd8SAlexandre Ghiti * any allocation to happen between _end and the next pmd aligned page. 1342bfc6cd8SAlexandre Ghiti */ 1352bfc6cd8SAlexandre Ghiti memblock_reserve(vmlinux_start, (vmlinux_end - vmlinux_start + PMD_SIZE - 1) & PMD_MASK); 136d90d45d7SAnup Patel 137abb8e86bSAtish Patra /* 138abb8e86bSAtish Patra * memblock allocator is not aware of the fact that last 4K bytes of 139abb8e86bSAtish Patra * the addressable memory can not be mapped because of IS_ERR_VALUE 140abb8e86bSAtish Patra * macro. Make sure that last 4k bytes are not usable by memblock 141abb8e86bSAtish Patra * if end of dram is equal to maximum addressable memory. 142abb8e86bSAtish Patra */ 143abb8e86bSAtish Patra if (max_mapped_addr == (dram_end - 1)) 144abb8e86bSAtish Patra memblock_set_current_limit(max_mapped_addr - 4096); 145abb8e86bSAtish Patra 146f6e5aedfSKefeng Wang min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 147f6e5aedfSKefeng Wang max_low_pfn = max_pfn = PFN_DOWN(dram_end); 148f6e5aedfSKefeng Wang 149da815582SKefeng Wang dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 150336e8eb2SGuo Ren set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 1510651c263SAnup Patel 152aec33b54SKefeng Wang reserve_initrd_mem(); 153922b0375SAlbert Ou /* 154f105aa94SVitaly Wool * If DTB is built in, no need to reserve its memblock. 155f105aa94SVitaly Wool * Otherwise, do reserve it but avoid using 156f105aa94SVitaly Wool * early_init_fdt_reserve_self() since __pa() does 157922b0375SAlbert Ou * not work for DTB pointers that are fixmap addresses 158922b0375SAlbert Ou */ 159f105aa94SVitaly Wool if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 160922b0375SAlbert Ou memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 161922b0375SAlbert Ou 1620651c263SAnup Patel early_init_fdt_scan_reserved_mem(); 163da815582SKefeng Wang dma_contiguous_reserve(dma32_phys_limit); 1640651c263SAnup Patel memblock_allow_resize(); 1650651c263SAnup Patel } 1666f1e9e94SAnup Patel 1676bd33e1eSChristoph Hellwig #ifdef CONFIG_MMU 168de31ea4aSJisheng Zhang static struct pt_alloc_ops pt_ops __ro_after_init; 169e8dcb61fSAtish Patra 1702bfc6cd8SAlexandre Ghiti /* Offset between linear mapping virtual address and kernel load address */ 171de31ea4aSJisheng Zhang unsigned long va_pa_offset __ro_after_init; 172387181dcSAnup Patel EXPORT_SYMBOL(va_pa_offset); 1732bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 1742bfc6cd8SAlexandre Ghiti /* Offset between kernel mapping virtual address and kernel load address */ 1752bfc6cd8SAlexandre Ghiti unsigned long va_kernel_pa_offset; 1762bfc6cd8SAlexandre Ghiti EXPORT_SYMBOL(va_kernel_pa_offset); 1772bfc6cd8SAlexandre Ghiti #endif 178de31ea4aSJisheng Zhang unsigned long pfn_base __ro_after_init; 179387181dcSAnup Patel EXPORT_SYMBOL(pfn_base); 180387181dcSAnup Patel 1816f1e9e94SAnup Patel pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 182671f9a3eSAnup Patel pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 183f2c17aabSAnup Patel pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 184671f9a3eSAnup Patel 185671f9a3eSAnup Patel pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 186f2c17aabSAnup Patel 187f2c17aabSAnup Patel void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 188f2c17aabSAnup Patel { 189f2c17aabSAnup Patel unsigned long addr = __fix_to_virt(idx); 190f2c17aabSAnup Patel pte_t *ptep; 191f2c17aabSAnup Patel 192f2c17aabSAnup Patel BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 193f2c17aabSAnup Patel 194f2c17aabSAnup Patel ptep = &fixmap_pte[pte_index(addr)]; 195f2c17aabSAnup Patel 19621190b74SGreentime Hu if (pgprot_val(prot)) 197f2c17aabSAnup Patel set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 19821190b74SGreentime Hu else 199f2c17aabSAnup Patel pte_clear(&init_mm, addr, ptep); 200f2c17aabSAnup Patel local_flush_tlb_page(addr); 201f2c17aabSAnup Patel } 202f2c17aabSAnup Patel 203e8dcb61fSAtish Patra static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 204671f9a3eSAnup Patel { 205671f9a3eSAnup Patel return (pte_t *)((uintptr_t)pa); 206671f9a3eSAnup Patel } 207e8dcb61fSAtish Patra 208e8dcb61fSAtish Patra static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 209e8dcb61fSAtish Patra { 210e8dcb61fSAtish Patra clear_fixmap(FIX_PTE); 211e8dcb61fSAtish Patra return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 212671f9a3eSAnup Patel } 213671f9a3eSAnup Patel 214e8dcb61fSAtish Patra static inline pte_t *get_pte_virt_late(phys_addr_t pa) 215e8dcb61fSAtish Patra { 216e8dcb61fSAtish Patra return (pte_t *) __va(pa); 217e8dcb61fSAtish Patra } 218e8dcb61fSAtish Patra 219e8dcb61fSAtish Patra static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 220671f9a3eSAnup Patel { 221671f9a3eSAnup Patel /* 222671f9a3eSAnup Patel * We only create PMD or PGD early mappings so we 223671f9a3eSAnup Patel * should never reach here with MMU disabled. 224671f9a3eSAnup Patel */ 225e8dcb61fSAtish Patra BUG(); 226e8dcb61fSAtish Patra } 227671f9a3eSAnup Patel 228e8dcb61fSAtish Patra static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 229e8dcb61fSAtish Patra { 230671f9a3eSAnup Patel return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 231671f9a3eSAnup Patel } 232671f9a3eSAnup Patel 233e8dcb61fSAtish Patra static phys_addr_t alloc_pte_late(uintptr_t va) 234e8dcb61fSAtish Patra { 235e8dcb61fSAtish Patra unsigned long vaddr; 236e8dcb61fSAtish Patra 237e8dcb61fSAtish Patra vaddr = __get_free_page(GFP_KERNEL); 238e75e6bf4Szhouchuangao BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))); 239e75e6bf4Szhouchuangao 240e8dcb61fSAtish Patra return __pa(vaddr); 241e8dcb61fSAtish Patra } 242e8dcb61fSAtish Patra 243671f9a3eSAnup Patel static void __init create_pte_mapping(pte_t *ptep, 244671f9a3eSAnup Patel uintptr_t va, phys_addr_t pa, 245671f9a3eSAnup Patel phys_addr_t sz, pgprot_t prot) 246671f9a3eSAnup Patel { 247974b9b2cSMike Rapoport uintptr_t pte_idx = pte_index(va); 248671f9a3eSAnup Patel 249671f9a3eSAnup Patel BUG_ON(sz != PAGE_SIZE); 250671f9a3eSAnup Patel 251974b9b2cSMike Rapoport if (pte_none(ptep[pte_idx])) 252974b9b2cSMike Rapoport ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 253671f9a3eSAnup Patel } 254671f9a3eSAnup Patel 255671f9a3eSAnup Patel #ifndef __PAGETABLE_PMD_FOLDED 256671f9a3eSAnup Patel 257671f9a3eSAnup Patel pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 258671f9a3eSAnup Patel pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 2590f02de44SAlexandre Ghiti pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 2601074dd44SAnup Patel pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 261671f9a3eSAnup Patel 262e8dcb61fSAtish Patra static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 263671f9a3eSAnup Patel { 264e8dcb61fSAtish Patra /* Before MMU is enabled */ 265671f9a3eSAnup Patel return (pmd_t *)((uintptr_t)pa); 266671f9a3eSAnup Patel } 267e8dcb61fSAtish Patra 268e8dcb61fSAtish Patra static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 269e8dcb61fSAtish Patra { 270e8dcb61fSAtish Patra clear_fixmap(FIX_PMD); 271e8dcb61fSAtish Patra return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 272671f9a3eSAnup Patel } 273671f9a3eSAnup Patel 274e8dcb61fSAtish Patra static pmd_t *get_pmd_virt_late(phys_addr_t pa) 275e8dcb61fSAtish Patra { 276e8dcb61fSAtish Patra return (pmd_t *) __va(pa); 277e8dcb61fSAtish Patra } 278e8dcb61fSAtish Patra 279e8dcb61fSAtish Patra static phys_addr_t __init alloc_pmd_early(uintptr_t va) 280671f9a3eSAnup Patel { 2812bfc6cd8SAlexandre Ghiti BUG_ON((va - kernel_virt_addr) >> PGDIR_SHIFT); 282671f9a3eSAnup Patel 2830f02de44SAlexandre Ghiti return (uintptr_t)early_pmd; 284671f9a3eSAnup Patel } 285671f9a3eSAnup Patel 286e8dcb61fSAtish Patra static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 287e8dcb61fSAtish Patra { 288e8dcb61fSAtish Patra return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 289e8dcb61fSAtish Patra } 290e8dcb61fSAtish Patra 291e8dcb61fSAtish Patra static phys_addr_t alloc_pmd_late(uintptr_t va) 292e8dcb61fSAtish Patra { 293e8dcb61fSAtish Patra unsigned long vaddr; 294e8dcb61fSAtish Patra 295e8dcb61fSAtish Patra vaddr = __get_free_page(GFP_KERNEL); 296e8dcb61fSAtish Patra BUG_ON(!vaddr); 297e8dcb61fSAtish Patra return __pa(vaddr); 298e8dcb61fSAtish Patra } 299e8dcb61fSAtish Patra 300671f9a3eSAnup Patel static void __init create_pmd_mapping(pmd_t *pmdp, 301671f9a3eSAnup Patel uintptr_t va, phys_addr_t pa, 302671f9a3eSAnup Patel phys_addr_t sz, pgprot_t prot) 303671f9a3eSAnup Patel { 304671f9a3eSAnup Patel pte_t *ptep; 305671f9a3eSAnup Patel phys_addr_t pte_phys; 306974b9b2cSMike Rapoport uintptr_t pmd_idx = pmd_index(va); 307671f9a3eSAnup Patel 308671f9a3eSAnup Patel if (sz == PMD_SIZE) { 309974b9b2cSMike Rapoport if (pmd_none(pmdp[pmd_idx])) 310974b9b2cSMike Rapoport pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 311671f9a3eSAnup Patel return; 312671f9a3eSAnup Patel } 313671f9a3eSAnup Patel 314974b9b2cSMike Rapoport if (pmd_none(pmdp[pmd_idx])) { 315e8dcb61fSAtish Patra pte_phys = pt_ops.alloc_pte(va); 316974b9b2cSMike Rapoport pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 317e8dcb61fSAtish Patra ptep = pt_ops.get_pte_virt(pte_phys); 318671f9a3eSAnup Patel memset(ptep, 0, PAGE_SIZE); 319671f9a3eSAnup Patel } else { 320974b9b2cSMike Rapoport pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 321e8dcb61fSAtish Patra ptep = pt_ops.get_pte_virt(pte_phys); 322671f9a3eSAnup Patel } 323671f9a3eSAnup Patel 324671f9a3eSAnup Patel create_pte_mapping(ptep, va, pa, sz, prot); 325671f9a3eSAnup Patel } 326671f9a3eSAnup Patel 327671f9a3eSAnup Patel #define pgd_next_t pmd_t 328e8dcb61fSAtish Patra #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 329e8dcb61fSAtish Patra #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 330671f9a3eSAnup Patel #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 331671f9a3eSAnup Patel create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 332671f9a3eSAnup Patel #define fixmap_pgd_next fixmap_pmd 333671f9a3eSAnup Patel #else 334671f9a3eSAnup Patel #define pgd_next_t pte_t 335e8dcb61fSAtish Patra #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 336e8dcb61fSAtish Patra #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 337671f9a3eSAnup Patel #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 338671f9a3eSAnup Patel create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 339671f9a3eSAnup Patel #define fixmap_pgd_next fixmap_pte 340671f9a3eSAnup Patel #endif 341671f9a3eSAnup Patel 342b91540d5SAtish Patra void __init create_pgd_mapping(pgd_t *pgdp, 343671f9a3eSAnup Patel uintptr_t va, phys_addr_t pa, 344671f9a3eSAnup Patel phys_addr_t sz, pgprot_t prot) 345671f9a3eSAnup Patel { 346671f9a3eSAnup Patel pgd_next_t *nextp; 347671f9a3eSAnup Patel phys_addr_t next_phys; 348974b9b2cSMike Rapoport uintptr_t pgd_idx = pgd_index(va); 349671f9a3eSAnup Patel 350671f9a3eSAnup Patel if (sz == PGDIR_SIZE) { 351974b9b2cSMike Rapoport if (pgd_val(pgdp[pgd_idx]) == 0) 352974b9b2cSMike Rapoport pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 353671f9a3eSAnup Patel return; 354671f9a3eSAnup Patel } 355671f9a3eSAnup Patel 356974b9b2cSMike Rapoport if (pgd_val(pgdp[pgd_idx]) == 0) { 357671f9a3eSAnup Patel next_phys = alloc_pgd_next(va); 358974b9b2cSMike Rapoport pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 359671f9a3eSAnup Patel nextp = get_pgd_next_virt(next_phys); 360671f9a3eSAnup Patel memset(nextp, 0, PAGE_SIZE); 361671f9a3eSAnup Patel } else { 362974b9b2cSMike Rapoport next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 363671f9a3eSAnup Patel nextp = get_pgd_next_virt(next_phys); 364671f9a3eSAnup Patel } 365671f9a3eSAnup Patel 366671f9a3eSAnup Patel create_pgd_next_mapping(nextp, va, pa, sz, prot); 367671f9a3eSAnup Patel } 368671f9a3eSAnup Patel 369671f9a3eSAnup Patel static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 370671f9a3eSAnup Patel { 3710fdc636cSZong Li /* Upgrade to PMD_SIZE mappings whenever possible */ 3720fdc636cSZong Li if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 3730fdc636cSZong Li return PAGE_SIZE; 374671f9a3eSAnup Patel 3750fdc636cSZong Li return PMD_SIZE; 376671f9a3eSAnup Patel } 377671f9a3eSAnup Patel 378387181dcSAnup Patel /* 379387181dcSAnup Patel * setup_vm() is called from head.S with MMU-off. 380387181dcSAnup Patel * 381387181dcSAnup Patel * Following requirements should be honoured for setup_vm() to work 382387181dcSAnup Patel * correctly: 383387181dcSAnup Patel * 1) It should use PC-relative addressing for accessing kernel symbols. 384387181dcSAnup Patel * To achieve this we always use GCC cmodel=medany. 385387181dcSAnup Patel * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 386387181dcSAnup Patel * so disable compiler instrumentation when FTRACE is enabled. 387387181dcSAnup Patel * 388387181dcSAnup Patel * Currently, the above requirements are honoured by using custom CFLAGS 389387181dcSAnup Patel * for init.o in mm/Makefile. 390387181dcSAnup Patel */ 391387181dcSAnup Patel 392387181dcSAnup Patel #ifndef __riscv_cmodel_medany 3936a527b67SPaul Walmsley #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 394387181dcSAnup Patel #endif 395387181dcSAnup Patel 3962bfc6cd8SAlexandre Ghiti uintptr_t load_pa, load_sz; 3972bfc6cd8SAlexandre Ghiti 3982bfc6cd8SAlexandre Ghiti static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size) 3992bfc6cd8SAlexandre Ghiti { 4002bfc6cd8SAlexandre Ghiti uintptr_t va, end_va; 4012bfc6cd8SAlexandre Ghiti 4022bfc6cd8SAlexandre Ghiti end_va = kernel_virt_addr + load_sz; 4032bfc6cd8SAlexandre Ghiti for (va = kernel_virt_addr; va < end_va; va += map_size) 4042bfc6cd8SAlexandre Ghiti create_pgd_mapping(pgdir, va, 4052bfc6cd8SAlexandre Ghiti load_pa + (va - kernel_virt_addr), 4062bfc6cd8SAlexandre Ghiti map_size, PAGE_KERNEL_EXEC); 4072bfc6cd8SAlexandre Ghiti } 4082bfc6cd8SAlexandre Ghiti 409671f9a3eSAnup Patel asmlinkage void __init setup_vm(uintptr_t dtb_pa) 4106f1e9e94SAnup Patel { 4112bfc6cd8SAlexandre Ghiti uintptr_t pa; 4120f02de44SAlexandre Ghiti uintptr_t map_size; 4136262f661SAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 4146262f661SAtish Patra pmd_t fix_bmap_spmd, fix_bmap_epmd; 4156262f661SAtish Patra #endif 4162bfc6cd8SAlexandre Ghiti load_pa = (uintptr_t)(&_start); 4172bfc6cd8SAlexandre Ghiti load_sz = (uintptr_t)(&_end) - load_pa; 4186f1e9e94SAnup Patel 419671f9a3eSAnup Patel va_pa_offset = PAGE_OFFSET - load_pa; 4202bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 4212bfc6cd8SAlexandre Ghiti va_kernel_pa_offset = kernel_virt_addr - load_pa; 4222bfc6cd8SAlexandre Ghiti #endif 4232bfc6cd8SAlexandre Ghiti 424671f9a3eSAnup Patel pfn_base = PFN_DOWN(load_pa); 425671f9a3eSAnup Patel 426671f9a3eSAnup Patel /* 427671f9a3eSAnup Patel * Enforce boot alignment requirements of RV32 and 428671f9a3eSAnup Patel * RV64 by only allowing PMD or PGD mappings. 429671f9a3eSAnup Patel */ 4300f02de44SAlexandre Ghiti map_size = PMD_SIZE; 4316f1e9e94SAnup Patel 4326f1e9e94SAnup Patel /* Sanity check alignment and size */ 4336f1e9e94SAnup Patel BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 434671f9a3eSAnup Patel BUG_ON((load_pa % map_size) != 0); 435671f9a3eSAnup Patel 436e8dcb61fSAtish Patra pt_ops.alloc_pte = alloc_pte_early; 437e8dcb61fSAtish Patra pt_ops.get_pte_virt = get_pte_virt_early; 438e8dcb61fSAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 439e8dcb61fSAtish Patra pt_ops.alloc_pmd = alloc_pmd_early; 440e8dcb61fSAtish Patra pt_ops.get_pmd_virt = get_pmd_virt_early; 441e8dcb61fSAtish Patra #endif 442671f9a3eSAnup Patel /* Setup early PGD for fixmap */ 443671f9a3eSAnup Patel create_pgd_mapping(early_pg_dir, FIXADDR_START, 444671f9a3eSAnup Patel (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 4456f1e9e94SAnup Patel 4466f1e9e94SAnup Patel #ifndef __PAGETABLE_PMD_FOLDED 447671f9a3eSAnup Patel /* Setup fixmap PMD */ 448671f9a3eSAnup Patel create_pmd_mapping(fixmap_pmd, FIXADDR_START, 449671f9a3eSAnup Patel (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 450671f9a3eSAnup Patel /* Setup trampoline PGD and PMD */ 4512bfc6cd8SAlexandre Ghiti create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr, 452671f9a3eSAnup Patel (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 4532bfc6cd8SAlexandre Ghiti create_pmd_mapping(trampoline_pmd, kernel_virt_addr, 454671f9a3eSAnup Patel load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 4556f1e9e94SAnup Patel #else 456671f9a3eSAnup Patel /* Setup trampoline PGD */ 4572bfc6cd8SAlexandre Ghiti create_pgd_mapping(trampoline_pg_dir, kernel_virt_addr, 458671f9a3eSAnup Patel load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 459671f9a3eSAnup Patel #endif 4606f1e9e94SAnup Patel 461671f9a3eSAnup Patel /* 4622bfc6cd8SAlexandre Ghiti * Setup early PGD covering entire kernel which will allow 463671f9a3eSAnup Patel * us to reach paging_init(). We map all memory banks later 464671f9a3eSAnup Patel * in setup_vm_final() below. 465671f9a3eSAnup Patel */ 4662bfc6cd8SAlexandre Ghiti create_kernel_page_table(early_pg_dir, map_size); 467f2c17aabSAnup Patel 4681074dd44SAnup Patel #ifndef __PAGETABLE_PMD_FOLDED 4691074dd44SAnup Patel /* Setup early PMD for DTB */ 4701074dd44SAnup Patel create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 4711074dd44SAnup Patel (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE); 472f105aa94SVitaly Wool #ifndef CONFIG_BUILTIN_DTB 4731074dd44SAnup Patel /* Create two consecutive PMD mappings for FDT early scan */ 4741074dd44SAnup Patel pa = dtb_pa & ~(PMD_SIZE - 1); 4751074dd44SAnup Patel create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 4761074dd44SAnup Patel pa, PMD_SIZE, PAGE_KERNEL); 4771074dd44SAnup Patel create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 4781074dd44SAnup Patel pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 4791074dd44SAnup Patel dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 480f105aa94SVitaly Wool #else /* CONFIG_BUILTIN_DTB */ 4812bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 4822bfc6cd8SAlexandre Ghiti /* 4832bfc6cd8SAlexandre Ghiti * __va can't be used since it would return a linear mapping address 4842bfc6cd8SAlexandre Ghiti * whereas dtb_early_va will be used before setup_vm_final installs 4852bfc6cd8SAlexandre Ghiti * the linear mapping. 4862bfc6cd8SAlexandre Ghiti */ 4872bfc6cd8SAlexandre Ghiti dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); 4882bfc6cd8SAlexandre Ghiti #else 489f105aa94SVitaly Wool dtb_early_va = __va(dtb_pa); 4902bfc6cd8SAlexandre Ghiti #endif /* CONFIG_64BIT */ 491f105aa94SVitaly Wool #endif /* CONFIG_BUILTIN_DTB */ 4921074dd44SAnup Patel #else 493f105aa94SVitaly Wool #ifndef CONFIG_BUILTIN_DTB 4948f3a2b4aSAnup Patel /* Create two consecutive PGD mappings for FDT early scan */ 4958f3a2b4aSAnup Patel pa = dtb_pa & ~(PGDIR_SIZE - 1); 4968f3a2b4aSAnup Patel create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 4978f3a2b4aSAnup Patel pa, PGDIR_SIZE, PAGE_KERNEL); 4988f3a2b4aSAnup Patel create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 4998f3a2b4aSAnup Patel pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 5008f3a2b4aSAnup Patel dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 501f105aa94SVitaly Wool #else /* CONFIG_BUILTIN_DTB */ 5022bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 5032bfc6cd8SAlexandre Ghiti dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); 5042bfc6cd8SAlexandre Ghiti #else 505f105aa94SVitaly Wool dtb_early_va = __va(dtb_pa); 5062bfc6cd8SAlexandre Ghiti #endif /* CONFIG_64BIT */ 507f105aa94SVitaly Wool #endif /* CONFIG_BUILTIN_DTB */ 5081074dd44SAnup Patel #endif 509922b0375SAlbert Ou dtb_early_pa = dtb_pa; 5106262f661SAtish Patra 5116262f661SAtish Patra /* 5126262f661SAtish Patra * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 5136262f661SAtish Patra * range can not span multiple pmds. 5146262f661SAtish Patra */ 5156262f661SAtish Patra BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 5166262f661SAtish Patra != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 5176262f661SAtish Patra 5186262f661SAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 5196262f661SAtish Patra /* 5206262f661SAtish Patra * Early ioremap fixmap is already created as it lies within first 2MB 5216262f661SAtish Patra * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 5226262f661SAtish Patra * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 5236262f661SAtish Patra * the user if not. 5246262f661SAtish Patra */ 5256262f661SAtish Patra fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 5266262f661SAtish Patra fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 5276262f661SAtish Patra if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 5286262f661SAtish Patra WARN_ON(1); 5296262f661SAtish Patra pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 5306262f661SAtish Patra pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 5316262f661SAtish Patra pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 5326262f661SAtish Patra fix_to_virt(FIX_BTMAP_BEGIN)); 5336262f661SAtish Patra pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 5346262f661SAtish Patra fix_to_virt(FIX_BTMAP_END)); 5356262f661SAtish Patra 5366262f661SAtish Patra pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 5376262f661SAtish Patra pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 5386262f661SAtish Patra } 5396262f661SAtish Patra #endif 5406f1e9e94SAnup Patel } 541f2c17aabSAnup Patel 5422bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 5432bfc6cd8SAlexandre Ghiti void protect_kernel_linear_mapping_text_rodata(void) 5442bfc6cd8SAlexandre Ghiti { 5452bfc6cd8SAlexandre Ghiti unsigned long text_start = (unsigned long)lm_alias(_start); 5462bfc6cd8SAlexandre Ghiti unsigned long init_text_start = (unsigned long)lm_alias(__init_text_begin); 5472bfc6cd8SAlexandre Ghiti unsigned long rodata_start = (unsigned long)lm_alias(__start_rodata); 5482bfc6cd8SAlexandre Ghiti unsigned long data_start = (unsigned long)lm_alias(_data); 5492bfc6cd8SAlexandre Ghiti 5502bfc6cd8SAlexandre Ghiti set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 5512bfc6cd8SAlexandre Ghiti set_memory_nx(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 5522bfc6cd8SAlexandre Ghiti 5532bfc6cd8SAlexandre Ghiti set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 5542bfc6cd8SAlexandre Ghiti set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 5552bfc6cd8SAlexandre Ghiti } 5562bfc6cd8SAlexandre Ghiti #endif 5572bfc6cd8SAlexandre Ghiti 558671f9a3eSAnup Patel static void __init setup_vm_final(void) 559671f9a3eSAnup Patel { 560671f9a3eSAnup Patel uintptr_t va, map_size; 561671f9a3eSAnup Patel phys_addr_t pa, start, end; 562b10d6bcaSMike Rapoport u64 i; 563671f9a3eSAnup Patel 564e8dcb61fSAtish Patra /** 565e8dcb61fSAtish Patra * MMU is enabled at this point. But page table setup is not complete yet. 566e8dcb61fSAtish Patra * fixmap page table alloc functions should be used at this point 567e8dcb61fSAtish Patra */ 568e8dcb61fSAtish Patra pt_ops.alloc_pte = alloc_pte_fixmap; 569e8dcb61fSAtish Patra pt_ops.get_pte_virt = get_pte_virt_fixmap; 570e8dcb61fSAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 571e8dcb61fSAtish Patra pt_ops.alloc_pmd = alloc_pmd_fixmap; 572e8dcb61fSAtish Patra pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 573e8dcb61fSAtish Patra #endif 574671f9a3eSAnup Patel /* Setup swapper PGD for fixmap */ 575671f9a3eSAnup Patel create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 576ac51e005SZong Li __pa_symbol(fixmap_pgd_next), 577671f9a3eSAnup Patel PGDIR_SIZE, PAGE_TABLE); 578671f9a3eSAnup Patel 5792bfc6cd8SAlexandre Ghiti /* Map all memory banks in the linear mapping */ 580b10d6bcaSMike Rapoport for_each_mem_range(i, &start, &end) { 581671f9a3eSAnup Patel if (start >= end) 582671f9a3eSAnup Patel break; 583671f9a3eSAnup Patel if (start <= __pa(PAGE_OFFSET) && 584671f9a3eSAnup Patel __pa(PAGE_OFFSET) < end) 585671f9a3eSAnup Patel start = __pa(PAGE_OFFSET); 586671f9a3eSAnup Patel 587671f9a3eSAnup Patel map_size = best_map_size(start, end - start); 588671f9a3eSAnup Patel for (pa = start; pa < end; pa += map_size) { 589671f9a3eSAnup Patel va = (uintptr_t)__va(pa); 590671f9a3eSAnup Patel create_pgd_mapping(swapper_pg_dir, va, pa, 5912bfc6cd8SAlexandre Ghiti map_size, 5922bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 5932bfc6cd8SAlexandre Ghiti PAGE_KERNEL 5942bfc6cd8SAlexandre Ghiti #else 5952bfc6cd8SAlexandre Ghiti PAGE_KERNEL_EXEC 5962bfc6cd8SAlexandre Ghiti #endif 5972bfc6cd8SAlexandre Ghiti ); 5982bfc6cd8SAlexandre Ghiti 599671f9a3eSAnup Patel } 600671f9a3eSAnup Patel } 601671f9a3eSAnup Patel 6022bfc6cd8SAlexandre Ghiti #ifdef CONFIG_64BIT 6032bfc6cd8SAlexandre Ghiti /* Map the kernel */ 6042bfc6cd8SAlexandre Ghiti create_kernel_page_table(swapper_pg_dir, PMD_SIZE); 6052bfc6cd8SAlexandre Ghiti #endif 6062bfc6cd8SAlexandre Ghiti 607671f9a3eSAnup Patel /* Clear fixmap PTE and PMD mappings */ 608671f9a3eSAnup Patel clear_fixmap(FIX_PTE); 609671f9a3eSAnup Patel clear_fixmap(FIX_PMD); 610671f9a3eSAnup Patel 611671f9a3eSAnup Patel /* Move to swapper page table */ 612ac51e005SZong Li csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 613671f9a3eSAnup Patel local_flush_tlb_all(); 614e8dcb61fSAtish Patra 615e8dcb61fSAtish Patra /* generic page allocation functions must be used to setup page table */ 616e8dcb61fSAtish Patra pt_ops.alloc_pte = alloc_pte_late; 617e8dcb61fSAtish Patra pt_ops.get_pte_virt = get_pte_virt_late; 618e8dcb61fSAtish Patra #ifndef __PAGETABLE_PMD_FOLDED 619e8dcb61fSAtish Patra pt_ops.alloc_pmd = alloc_pmd_late; 620e8dcb61fSAtish Patra pt_ops.get_pmd_virt = get_pmd_virt_late; 621e8dcb61fSAtish Patra #endif 622671f9a3eSAnup Patel } 6236bd33e1eSChristoph Hellwig #else 6246bd33e1eSChristoph Hellwig asmlinkage void __init setup_vm(uintptr_t dtb_pa) 6256bd33e1eSChristoph Hellwig { 6266bd33e1eSChristoph Hellwig dtb_early_va = (void *)dtb_pa; 627a78c6f59SAtish Patra dtb_early_pa = dtb_pa; 6286bd33e1eSChristoph Hellwig } 6296bd33e1eSChristoph Hellwig 6306bd33e1eSChristoph Hellwig static inline void setup_vm_final(void) 6316bd33e1eSChristoph Hellwig { 6326bd33e1eSChristoph Hellwig } 6336bd33e1eSChristoph Hellwig #endif /* CONFIG_MMU */ 634671f9a3eSAnup Patel 635d27c3c90SZong Li #ifdef CONFIG_STRICT_KERNEL_RWX 6361987501bSJisheng Zhang void __init protect_kernel_text_data(void) 637d27c3c90SZong Li { 63819a00869SAtish Patra unsigned long text_start = (unsigned long)_start; 63919a00869SAtish Patra unsigned long init_text_start = (unsigned long)__init_text_begin; 64019a00869SAtish Patra unsigned long init_data_start = (unsigned long)__init_data_begin; 641d27c3c90SZong Li unsigned long rodata_start = (unsigned long)__start_rodata; 642d27c3c90SZong Li unsigned long data_start = (unsigned long)_data; 643d27c3c90SZong Li unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); 644d27c3c90SZong Li 64519a00869SAtish Patra set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 64619a00869SAtish Patra set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT); 64719a00869SAtish Patra set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT); 64819a00869SAtish Patra /* rodata section is marked readonly in mark_rodata_ro */ 649d27c3c90SZong Li set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 650d27c3c90SZong Li set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 65119a00869SAtish Patra } 65219a00869SAtish Patra 65319a00869SAtish Patra void mark_rodata_ro(void) 65419a00869SAtish Patra { 65519a00869SAtish Patra unsigned long rodata_start = (unsigned long)__start_rodata; 65619a00869SAtish Patra unsigned long data_start = (unsigned long)_data; 65719a00869SAtish Patra 65819a00869SAtish Patra set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 659b422d28bSZong Li 660b422d28bSZong Li debug_checkwx(); 661d27c3c90SZong Li } 662d27c3c90SZong Li #endif 663d27c3c90SZong Li 664*e53d2818SNick Kossifidis #ifdef CONFIG_KEXEC_CORE 665*e53d2818SNick Kossifidis /* 666*e53d2818SNick Kossifidis * reserve_crashkernel() - reserves memory for crash kernel 667*e53d2818SNick Kossifidis * 668*e53d2818SNick Kossifidis * This function reserves memory area given in "crashkernel=" kernel command 669*e53d2818SNick Kossifidis * line parameter. The memory reserved is used by dump capture kernel when 670*e53d2818SNick Kossifidis * primary kernel is crashing. 671*e53d2818SNick Kossifidis */ 672*e53d2818SNick Kossifidis static void __init reserve_crashkernel(void) 673*e53d2818SNick Kossifidis { 674*e53d2818SNick Kossifidis unsigned long long crash_base = 0; 675*e53d2818SNick Kossifidis unsigned long long crash_size = 0; 676*e53d2818SNick Kossifidis unsigned long search_start = memblock_start_of_DRAM(); 677*e53d2818SNick Kossifidis unsigned long search_end = memblock_end_of_DRAM(); 678*e53d2818SNick Kossifidis 679*e53d2818SNick Kossifidis int ret = 0; 680*e53d2818SNick Kossifidis 681*e53d2818SNick Kossifidis ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 682*e53d2818SNick Kossifidis &crash_size, &crash_base); 683*e53d2818SNick Kossifidis if (ret || !crash_size) 684*e53d2818SNick Kossifidis return; 685*e53d2818SNick Kossifidis 686*e53d2818SNick Kossifidis crash_size = PAGE_ALIGN(crash_size); 687*e53d2818SNick Kossifidis 688*e53d2818SNick Kossifidis if (crash_base == 0) { 689*e53d2818SNick Kossifidis /* 690*e53d2818SNick Kossifidis * Current riscv boot protocol requires 2MB alignment for 691*e53d2818SNick Kossifidis * RV64 and 4MB alignment for RV32 (hugepage size) 692*e53d2818SNick Kossifidis */ 693*e53d2818SNick Kossifidis crash_base = memblock_find_in_range(search_start, search_end, 694*e53d2818SNick Kossifidis crash_size, PMD_SIZE); 695*e53d2818SNick Kossifidis 696*e53d2818SNick Kossifidis if (crash_base == 0) { 697*e53d2818SNick Kossifidis pr_warn("crashkernel: couldn't allocate %lldKB\n", 698*e53d2818SNick Kossifidis crash_size >> 10); 699*e53d2818SNick Kossifidis return; 700*e53d2818SNick Kossifidis } 701*e53d2818SNick Kossifidis } else { 702*e53d2818SNick Kossifidis /* User specifies base address explicitly. */ 703*e53d2818SNick Kossifidis if (!memblock_is_region_memory(crash_base, crash_size)) { 704*e53d2818SNick Kossifidis pr_warn("crashkernel: requested region is not memory\n"); 705*e53d2818SNick Kossifidis return; 706*e53d2818SNick Kossifidis } 707*e53d2818SNick Kossifidis 708*e53d2818SNick Kossifidis if (memblock_is_region_reserved(crash_base, crash_size)) { 709*e53d2818SNick Kossifidis pr_warn("crashkernel: requested region is reserved\n"); 710*e53d2818SNick Kossifidis return; 711*e53d2818SNick Kossifidis } 712*e53d2818SNick Kossifidis 713*e53d2818SNick Kossifidis 714*e53d2818SNick Kossifidis if (!IS_ALIGNED(crash_base, PMD_SIZE)) { 715*e53d2818SNick Kossifidis pr_warn("crashkernel: requested region is misaligned\n"); 716*e53d2818SNick Kossifidis return; 717*e53d2818SNick Kossifidis } 718*e53d2818SNick Kossifidis } 719*e53d2818SNick Kossifidis memblock_reserve(crash_base, crash_size); 720*e53d2818SNick Kossifidis 721*e53d2818SNick Kossifidis pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 722*e53d2818SNick Kossifidis crash_base, crash_base + crash_size, crash_size >> 20); 723*e53d2818SNick Kossifidis 724*e53d2818SNick Kossifidis crashk_res.start = crash_base; 725*e53d2818SNick Kossifidis crashk_res.end = crash_base + crash_size - 1; 726*e53d2818SNick Kossifidis } 727*e53d2818SNick Kossifidis #endif /* CONFIG_KEXEC_CORE */ 728*e53d2818SNick Kossifidis 729671f9a3eSAnup Patel void __init paging_init(void) 730671f9a3eSAnup Patel { 731671f9a3eSAnup Patel setup_vm_final(); 732671f9a3eSAnup Patel setup_zero_page(); 733cbd34f4bSAtish Patra } 734cbd34f4bSAtish Patra 735cbd34f4bSAtish Patra void __init misc_mem_init(void) 736cbd34f4bSAtish Patra { 737f6e5aedfSKefeng Wang early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 7384f0e8eefSAtish Patra arch_numa_init(); 739cbd34f4bSAtish Patra sparse_init(); 740671f9a3eSAnup Patel zone_sizes_init(); 741*e53d2818SNick Kossifidis #ifdef CONFIG_KEXEC_CORE 742*e53d2818SNick Kossifidis reserve_crashkernel(); 743*e53d2818SNick Kossifidis #endif 7444f0e8eefSAtish Patra memblock_dump_all(); 7456f1e9e94SAnup Patel } 746d95f1a54SLogan Gunthorpe 7479fe57d8cSKefeng Wang #ifdef CONFIG_SPARSEMEM_VMEMMAP 748d95f1a54SLogan Gunthorpe int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 749d95f1a54SLogan Gunthorpe struct vmem_altmap *altmap) 750d95f1a54SLogan Gunthorpe { 7511d9cfee7SAnshuman Khandual return vmemmap_populate_basepages(start, end, node, NULL); 752d95f1a54SLogan Gunthorpe } 753d95f1a54SLogan Gunthorpe #endif 754