| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * linux/arch/sh/mm/init.c |
| * |
| * Copyright (C) 1999 Niibe Yutaka |
| * Copyright (C) 2002 - 2011 Paul Mundt |
| * |
| * Based on linux/arch/i386/mm/init.c: |
| * Copyright (C) 1995 Linus Torvalds |
| */ |
| #include <linux/mm.h> |
| #include <linux/swap.h> |
| #include <linux/init.h> |
| #include <linux/gfp.h> |
| #include <linux/memblock.h> |
| #include <linux/proc_fs.h> |
| #include <linux/pagemap.h> |
| #include <linux/percpu.h> |
| #include <linux/io.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/export.h> |
| #include <asm/mmu_context.h> |
| #include <asm/mmzone.h> |
| #include <asm/kexec.h> |
| #include <asm/tlb.h> |
| #include <asm/cacheflush.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/cache.h> |
| #include <asm/pgalloc.h> |
| #include <linux/sizes.h> |
| #include "ioremap.h" |
| |
| pgd_t swapper_pg_dir[PTRS_PER_PGD]; |
| |
| void __init generic_mem_init(void) |
| { |
| memblock_add(__MEMORY_START, __MEMORY_SIZE); |
| } |
| |
| void __init __weak plat_mem_setup(void) |
| { |
| /* Nothing to see here, move along. */ |
| } |
| |
| #ifdef CONFIG_MMU |
| static pte_t *__get_pte_phys(unsigned long addr) |
| { |
| pgd_t *pgd; |
| p4d_t *p4d; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| pgd = pgd_offset_k(addr); |
| if (pgd_none(*pgd)) { |
| pgd_ERROR(*pgd); |
| return NULL; |
| } |
| |
| p4d = p4d_alloc(NULL, pgd, addr); |
| if (unlikely(!p4d)) { |
| p4d_ERROR(*p4d); |
| return NULL; |
| } |
| |
| pud = pud_alloc(NULL, p4d, addr); |
| if (unlikely(!pud)) { |
| pud_ERROR(*pud); |
| return NULL; |
| } |
| |
| pmd = pmd_alloc(NULL, pud, addr); |
| if (unlikely(!pmd)) { |
| pmd_ERROR(*pmd); |
| return NULL; |
| } |
| |
| return pte_offset_kernel(pmd, addr); |
| } |
| |
| static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot) |
| { |
| pte_t *pte; |
| |
| pte = __get_pte_phys(addr); |
| if (!pte_none(*pte)) { |
| pte_ERROR(*pte); |
| return; |
| } |
| |
| set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot)); |
| local_flush_tlb_one(get_asid(), addr); |
| |
| if (pgprot_val(prot) & _PAGE_WIRED) |
| tlb_wire_entry(NULL, addr, *pte); |
| } |
| |
| static void clear_pte_phys(unsigned long addr, pgprot_t prot) |
| { |
| pte_t *pte; |
| |
| pte = __get_pte_phys(addr); |
| |
| if (pgprot_val(prot) & _PAGE_WIRED) |
| tlb_unwire_entry(); |
| |
| set_pte(pte, pfn_pte(0, __pgprot(0))); |
| local_flush_tlb_one(get_asid(), addr); |
| } |
| |
| void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot) |
| { |
| unsigned long address = __fix_to_virt(idx); |
| |
| if (idx >= __end_of_fixed_addresses) { |
| BUG(); |
| return; |
| } |
| |
| set_pte_phys(address, phys, prot); |
| } |
| |
| void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot) |
| { |
| unsigned long address = __fix_to_virt(idx); |
| |
| if (idx >= __end_of_fixed_addresses) { |
| BUG(); |
| return; |
| } |
| |
| clear_pte_phys(address, prot); |
| } |
| |
| static pmd_t * __init one_md_table_init(pud_t *pud) |
| { |
| if (pud_none(*pud)) { |
| pmd_t *pmd; |
| |
| pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
| if (!pmd) |
| panic("%s: Failed to allocate %lu bytes align=0x%lx\n", |
| __func__, PAGE_SIZE, PAGE_SIZE); |
| pud_populate(&init_mm, pud, pmd); |
| BUG_ON(pmd != pmd_offset(pud, 0)); |
| } |
| |
| return pmd_offset(pud, 0); |
| } |
| |
| static pte_t * __init one_page_table_init(pmd_t *pmd) |
| { |
| if (pmd_none(*pmd)) { |
| pte_t *pte; |
| |
| pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
| if (!pte) |
| panic("%s: Failed to allocate %lu bytes align=0x%lx\n", |
| __func__, PAGE_SIZE, PAGE_SIZE); |
| pmd_populate_kernel(&init_mm, pmd, pte); |
| BUG_ON(pte != pte_offset_kernel(pmd, 0)); |
| } |
| |
| return pte_offset_kernel(pmd, 0); |
| } |
| |
| static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd, |
| unsigned long vaddr, pte_t *lastpte) |
| { |
| return pte; |
| } |
| |
| void __init page_table_range_init(unsigned long start, unsigned long end, |
| pgd_t *pgd_base) |
| { |
| pgd_t *pgd; |
| pud_t *pud; |
| pmd_t *pmd; |
| pte_t *pte = NULL; |
| int i, j, k; |
| unsigned long vaddr; |
| |
| vaddr = start; |
| i = pgd_index(vaddr); |
| j = pud_index(vaddr); |
| k = pmd_index(vaddr); |
| pgd = pgd_base + i; |
| |
| for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { |
| pud = (pud_t *)pgd; |
| for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { |
| pmd = one_md_table_init(pud); |
| #ifndef __PAGETABLE_PMD_FOLDED |
| pmd += k; |
| #endif |
| for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { |
| pte = page_table_kmap_check(one_page_table_init(pmd), |
| pmd, vaddr, pte); |
| vaddr += PMD_SIZE; |
| } |
| k = 0; |
| } |
| j = 0; |
| } |
| } |
| #endif /* CONFIG_MMU */ |
| |
| void __init allocate_pgdat(unsigned int nid) |
| { |
| unsigned long start_pfn, end_pfn; |
| |
| get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); |
| |
| #ifdef CONFIG_NUMA |
| NODE_DATA(nid) = memblock_alloc_try_nid( |
| sizeof(struct pglist_data), |
| SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT, |
| MEMBLOCK_ALLOC_ACCESSIBLE, nid); |
| if (!NODE_DATA(nid)) |
| panic("Can't allocate pgdat for node %d\n", nid); |
| #endif |
| |
| NODE_DATA(nid)->node_start_pfn = start_pfn; |
| NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; |
| } |
| |
| static void __init do_init_bootmem(void) |
| { |
| unsigned long start_pfn, end_pfn; |
| int i; |
| |
| /* Add active regions with valid PFNs. */ |
| for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) |
| __add_active_range(0, start_pfn, end_pfn); |
| |
| /* All of system RAM sits in node 0 for the non-NUMA case */ |
| allocate_pgdat(0); |
| node_set_online(0); |
| |
| plat_mem_setup(); |
| |
| sparse_init(); |
| } |
| |
| static void __init early_reserve_mem(void) |
| { |
| unsigned long start_pfn; |
| u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET; |
| u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET; |
| |
| /* |
| * Partially used pages are not usable - thus |
| * we are rounding upwards: |
| */ |
| start_pfn = PFN_UP(__pa(_end)); |
| |
| /* |
| * Reserve the kernel text and Reserve the bootmem bitmap. We do |
| * this in two steps (first step was init_bootmem()), because |
| * this catches the (definitely buggy) case of us accidentally |
| * initializing the bootmem allocator with an invalid RAM area. |
| */ |
| memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start); |
| |
| /* |
| * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. |
| */ |
| if (CONFIG_ZERO_PAGE_OFFSET != 0) |
| memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET); |
| |
| /* |
| * Handle additional early reservations |
| */ |
| check_for_initrd(); |
| reserve_crashkernel(); |
| } |
| |
| void __init paging_init(void) |
| { |
| unsigned long max_zone_pfns[MAX_NR_ZONES]; |
| unsigned long vaddr, end; |
| |
| sh_mv.mv_mem_init(); |
| |
| early_reserve_mem(); |
| |
| /* |
| * Once the early reservations are out of the way, give the |
| * platforms a chance to kick out some memory. |
| */ |
| if (sh_mv.mv_mem_reserve) |
| sh_mv.mv_mem_reserve(); |
| |
| memblock_enforce_memory_limit(memory_limit); |
| memblock_allow_resize(); |
| |
| memblock_dump_all(); |
| |
| /* |
| * Determine low and high memory ranges: |
| */ |
| max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT; |
| min_low_pfn = __MEMORY_START >> PAGE_SHIFT; |
| set_max_mapnr(max_low_pfn - min_low_pfn); |
| |
| nodes_clear(node_online_map); |
| |
| memory_start = (unsigned long)__va(__MEMORY_START); |
| memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size()); |
| |
| uncached_init(); |
| pmb_init(); |
| do_init_bootmem(); |
| ioremap_fixed_init(); |
| |
| /* We don't need to map the kernel through the TLB, as |
| * it is permanatly mapped using P1. So clear the |
| * entire pgd. */ |
| memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir)); |
| |
| /* Set an initial value for the MMU.TTB so we don't have to |
| * check for a null value. */ |
| set_TTB(swapper_pg_dir); |
| |
| /* |
| * Populate the relevant portions of swapper_pg_dir so that |
| * we can use the fixmap entries without calling kmalloc. |
| * pte's will be filled in by __set_fixmap(). |
| */ |
| vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; |
| end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK; |
| page_table_range_init(vaddr, end, swapper_pg_dir); |
| |
| kmap_coherent_init(); |
| |
| memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
| max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
| free_area_init(max_zone_pfns); |
| } |
| |
| unsigned int mem_init_done = 0; |
| |
| void __init mem_init(void) |
| { |
| pg_data_t *pgdat; |
| |
| high_memory = NULL; |
| for_each_online_pgdat(pgdat) |
| high_memory = max_t(void *, high_memory, |
| __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT)); |
| |
| memblock_free_all(); |
| |
| /* Set this up early, so we can take care of the zero page */ |
| cpu_cache_init(); |
| |
| /* clear the zero-page */ |
| memset(empty_zero_page, 0, PAGE_SIZE); |
| __flush_wback_region(empty_zero_page, PAGE_SIZE); |
| |
| vsyscall_init(); |
| |
| pr_info("virtual kernel memory layout:\n" |
| " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n" |
| " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n" |
| #ifdef CONFIG_UNCACHED_MAPPING |
| " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n" |
| #endif |
| " .init : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " .data : 0x%08lx - 0x%08lx (%4ld kB)\n" |
| " .text : 0x%08lx - 0x%08lx (%4ld kB)\n", |
| FIXADDR_START, FIXADDR_TOP, |
| (FIXADDR_TOP - FIXADDR_START) >> 10, |
| |
| (unsigned long)VMALLOC_START, VMALLOC_END, |
| (VMALLOC_END - VMALLOC_START) >> 20, |
| |
| (unsigned long)memory_start, (unsigned long)high_memory, |
| ((unsigned long)high_memory - (unsigned long)memory_start) >> 20, |
| |
| #ifdef CONFIG_UNCACHED_MAPPING |
| uncached_start, uncached_end, uncached_size >> 20, |
| #endif |
| |
| (unsigned long)&__init_begin, (unsigned long)&__init_end, |
| ((unsigned long)&__init_end - |
| (unsigned long)&__init_begin) >> 10, |
| |
| (unsigned long)&_etext, (unsigned long)&_edata, |
| ((unsigned long)&_edata - (unsigned long)&_etext) >> 10, |
| |
| (unsigned long)&_text, (unsigned long)&_etext, |
| ((unsigned long)&_etext - (unsigned long)&_text) >> 10); |
| |
| mem_init_done = 1; |
| } |