427 строки
9.8 KiB
C
427 строки
9.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/sh/mm/init.c
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 - 2011 Paul Mundt
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*
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* Based on linux/arch/i386/mm/init.c:
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* Copyright (C) 1995 Linus Torvalds
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*/
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/proc_fs.h>
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#include <linux/pagemap.h>
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#include <linux/percpu.h>
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#include <linux/io.h>
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <asm/mmu_context.h>
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#include <asm/mmzone.h>
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#include <asm/kexec.h>
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#include <asm/tlb.h>
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#include <asm/cacheflush.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/cache.h>
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#include <asm/pgalloc.h>
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#include <linux/sizes.h>
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#include "ioremap.h"
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pgd_t swapper_pg_dir[PTRS_PER_PGD];
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void __init generic_mem_init(void)
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{
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memblock_add(__MEMORY_START, __MEMORY_SIZE);
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}
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void __init __weak plat_mem_setup(void)
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{
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/* Nothing to see here, move along. */
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}
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#ifdef CONFIG_MMU
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static pte_t *__get_pte_phys(unsigned long addr)
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{
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pgd_t *pgd;
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p4d_t *p4d;
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pud_t *pud;
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pmd_t *pmd;
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pgd = pgd_offset_k(addr);
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if (pgd_none(*pgd)) {
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pgd_ERROR(*pgd);
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return NULL;
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}
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p4d = p4d_alloc(NULL, pgd, addr);
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if (unlikely(!p4d)) {
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p4d_ERROR(*p4d);
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return NULL;
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}
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pud = pud_alloc(NULL, p4d, addr);
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if (unlikely(!pud)) {
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pud_ERROR(*pud);
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return NULL;
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}
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pmd = pmd_alloc(NULL, pud, addr);
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if (unlikely(!pmd)) {
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pmd_ERROR(*pmd);
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return NULL;
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}
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return pte_offset_kernel(pmd, addr);
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}
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static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
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{
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pte_t *pte;
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pte = __get_pte_phys(addr);
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if (!pte_none(*pte)) {
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pte_ERROR(*pte);
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return;
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}
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
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local_flush_tlb_one(get_asid(), addr);
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if (pgprot_val(prot) & _PAGE_WIRED)
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tlb_wire_entry(NULL, addr, *pte);
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}
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static void clear_pte_phys(unsigned long addr, pgprot_t prot)
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{
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pte_t *pte;
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pte = __get_pte_phys(addr);
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if (pgprot_val(prot) & _PAGE_WIRED)
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tlb_unwire_entry();
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set_pte(pte, pfn_pte(0, __pgprot(0)));
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local_flush_tlb_one(get_asid(), addr);
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}
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void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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set_pte_phys(address, phys, prot);
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}
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void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
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{
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unsigned long address = __fix_to_virt(idx);
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if (idx >= __end_of_fixed_addresses) {
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BUG();
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return;
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}
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clear_pte_phys(address, prot);
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}
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static pmd_t * __init one_md_table_init(pud_t *pud)
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{
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if (pud_none(*pud)) {
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pmd_t *pmd;
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pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pmd)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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pud_populate(&init_mm, pud, pmd);
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BUG_ON(pmd != pmd_offset(pud, 0));
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}
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return pmd_offset(pud, 0);
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}
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static pte_t * __init one_page_table_init(pmd_t *pmd)
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{
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if (pmd_none(*pmd)) {
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pte_t *pte;
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pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
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if (!pte)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, PAGE_SIZE, PAGE_SIZE);
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pmd_populate_kernel(&init_mm, pmd, pte);
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BUG_ON(pte != pte_offset_kernel(pmd, 0));
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}
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return pte_offset_kernel(pmd, 0);
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}
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static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
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unsigned long vaddr, pte_t *lastpte)
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{
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return pte;
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}
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void __init page_table_range_init(unsigned long start, unsigned long end,
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pgd_t *pgd_base)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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int i, j, k;
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unsigned long vaddr;
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vaddr = start;
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i = pgd_index(vaddr);
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j = pud_index(vaddr);
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k = pmd_index(vaddr);
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pgd = pgd_base + i;
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for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
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pud = (pud_t *)pgd;
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for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
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pmd = one_md_table_init(pud);
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#ifndef __PAGETABLE_PMD_FOLDED
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pmd += k;
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#endif
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for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
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pte = page_table_kmap_check(one_page_table_init(pmd),
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pmd, vaddr, pte);
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vaddr += PMD_SIZE;
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}
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k = 0;
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}
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j = 0;
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}
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}
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#endif /* CONFIG_MMU */
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void __init allocate_pgdat(unsigned int nid)
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{
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unsigned long start_pfn, end_pfn;
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get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
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#ifdef CONFIG_NEED_MULTIPLE_NODES
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NODE_DATA(nid) = memblock_alloc_try_nid(
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sizeof(struct pglist_data),
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SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
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MEMBLOCK_ALLOC_ACCESSIBLE, nid);
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if (!NODE_DATA(nid))
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panic("Can't allocate pgdat for node %d\n", nid);
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#endif
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NODE_DATA(nid)->node_start_pfn = start_pfn;
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NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
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}
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static void __init do_init_bootmem(void)
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{
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unsigned long start_pfn, end_pfn;
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int i;
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/* Add active regions with valid PFNs. */
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for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
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__add_active_range(0, start_pfn, end_pfn);
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/* All of system RAM sits in node 0 for the non-NUMA case */
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allocate_pgdat(0);
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node_set_online(0);
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plat_mem_setup();
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sparse_init();
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}
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static void __init early_reserve_mem(void)
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{
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unsigned long start_pfn;
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u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
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u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
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/*
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* Partially used pages are not usable - thus
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* we are rounding upwards:
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*/
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start_pfn = PFN_UP(__pa(_end));
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/*
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* Reserve the kernel text and Reserve the bootmem bitmap. We do
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* this in two steps (first step was init_bootmem()), because
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* this catches the (definitely buggy) case of us accidentally
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* initializing the bootmem allocator with an invalid RAM area.
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*/
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memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
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/*
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* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
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*/
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if (CONFIG_ZERO_PAGE_OFFSET != 0)
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memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
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/*
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* Handle additional early reservations
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*/
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check_for_initrd();
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reserve_crashkernel();
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}
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void __init paging_init(void)
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{
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unsigned long max_zone_pfns[MAX_NR_ZONES];
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unsigned long vaddr, end;
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sh_mv.mv_mem_init();
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early_reserve_mem();
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/*
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* Once the early reservations are out of the way, give the
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* platforms a chance to kick out some memory.
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*/
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if (sh_mv.mv_mem_reserve)
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sh_mv.mv_mem_reserve();
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memblock_enforce_memory_limit(memory_limit);
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memblock_allow_resize();
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memblock_dump_all();
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/*
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* Determine low and high memory ranges:
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*/
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max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
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min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
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nodes_clear(node_online_map);
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memory_start = (unsigned long)__va(__MEMORY_START);
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memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
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uncached_init();
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pmb_init();
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do_init_bootmem();
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ioremap_fixed_init();
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/* We don't need to map the kernel through the TLB, as
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* it is permanatly mapped using P1. So clear the
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* entire pgd. */
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memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
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/* Set an initial value for the MMU.TTB so we don't have to
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* check for a null value. */
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set_TTB(swapper_pg_dir);
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/*
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* Populate the relevant portions of swapper_pg_dir so that
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* we can use the fixmap entries without calling kmalloc.
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* pte's will be filled in by __set_fixmap().
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*/
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vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
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end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
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page_table_range_init(vaddr, end, swapper_pg_dir);
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kmap_coherent_init();
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memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
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max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
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free_area_init(max_zone_pfns);
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}
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unsigned int mem_init_done = 0;
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void __init mem_init(void)
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{
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pg_data_t *pgdat;
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high_memory = NULL;
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for_each_online_pgdat(pgdat)
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high_memory = max_t(void *, high_memory,
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__va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
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memblock_free_all();
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/* Set this up early, so we can take care of the zero page */
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cpu_cache_init();
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/* clear the zero-page */
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memset(empty_zero_page, 0, PAGE_SIZE);
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__flush_wback_region(empty_zero_page, PAGE_SIZE);
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vsyscall_init();
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mem_init_print_info(NULL);
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pr_info("virtual kernel memory layout:\n"
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" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
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#ifdef CONFIG_UNCACHED_MAPPING
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" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
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#endif
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" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
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FIXADDR_START, FIXADDR_TOP,
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(FIXADDR_TOP - FIXADDR_START) >> 10,
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(unsigned long)VMALLOC_START, VMALLOC_END,
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(VMALLOC_END - VMALLOC_START) >> 20,
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(unsigned long)memory_start, (unsigned long)high_memory,
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((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
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#ifdef CONFIG_UNCACHED_MAPPING
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uncached_start, uncached_end, uncached_size >> 20,
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#endif
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(unsigned long)&__init_begin, (unsigned long)&__init_end,
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((unsigned long)&__init_end -
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(unsigned long)&__init_begin) >> 10,
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(unsigned long)&_etext, (unsigned long)&_edata,
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((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
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(unsigned long)&_text, (unsigned long)&_etext,
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((unsigned long)&_etext - (unsigned long)&_text) >> 10);
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mem_init_done = 1;
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}
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#ifdef CONFIG_MEMORY_HOTPLUG
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int arch_add_memory(int nid, u64 start, u64 size,
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struct mhp_params *params)
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{
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unsigned long start_pfn = PFN_DOWN(start);
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unsigned long nr_pages = size >> PAGE_SHIFT;
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int ret;
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if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
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return -EINVAL;
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/* We only have ZONE_NORMAL, so this is easy.. */
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ret = __add_pages(nid, start_pfn, nr_pages, params);
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if (unlikely(ret))
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printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
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return ret;
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}
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void arch_remove_memory(int nid, u64 start, u64 size,
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struct vmem_altmap *altmap)
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{
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unsigned long start_pfn = PFN_DOWN(start);
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unsigned long nr_pages = size >> PAGE_SHIFT;
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__remove_pages(start_pfn, nr_pages, altmap);
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}
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#endif /* CONFIG_MEMORY_HOTPLUG */
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