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130 lines
2.9 KiB
130 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/m68k/mm/init.c |
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* |
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* Copyright (C) 1995 Hamish Macdonald |
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* |
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* Contains common initialization routines, specific init code moved |
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* to motorola.c and sun3mmu.c |
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*/ |
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#include <linux/module.h> |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/mm.h> |
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#include <linux/swap.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/init.h> |
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#include <linux/memblock.h> |
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#include <linux/gfp.h> |
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#include <asm/setup.h> |
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#include <linux/uaccess.h> |
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#include <asm/page.h> |
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#include <asm/pgalloc.h> |
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#include <asm/traps.h> |
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#include <asm/machdep.h> |
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#include <asm/io.h> |
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#ifdef CONFIG_ATARI |
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#include <asm/atari_stram.h> |
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#endif |
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#include <asm/sections.h> |
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#include <asm/tlb.h> |
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/* |
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* ZERO_PAGE is a special page that is used for zero-initialized |
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* data and COW. |
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*/ |
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void *empty_zero_page; |
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EXPORT_SYMBOL(empty_zero_page); |
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#ifdef CONFIG_MMU |
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int m68k_virt_to_node_shift; |
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void __init m68k_setup_node(int node) |
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{ |
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node_set_online(node); |
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} |
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#else /* CONFIG_MMU */ |
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/* |
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* paging_init() continues the virtual memory environment setup which |
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* was begun by the code in arch/head.S. |
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* The parameters are pointers to where to stick the starting and ending |
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* addresses of available kernel virtual memory. |
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*/ |
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void __init paging_init(void) |
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{ |
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/* |
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* Make sure start_mem is page aligned, otherwise bootmem and |
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* page_alloc get different views of the world. |
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*/ |
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unsigned long end_mem = memory_end & PAGE_MASK; |
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unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0, }; |
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high_memory = (void *) end_mem; |
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empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE); |
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if (!empty_zero_page) |
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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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max_zone_pfn[ZONE_DMA] = end_mem >> PAGE_SHIFT; |
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free_area_init(max_zone_pfn); |
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} |
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#endif /* CONFIG_MMU */ |
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void free_initmem(void) |
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{ |
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#ifndef CONFIG_MMU_SUN3 |
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free_initmem_default(-1); |
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#endif /* CONFIG_MMU_SUN3 */ |
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} |
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#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE) |
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#define VECTORS &vectors[0] |
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#else |
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#define VECTORS _ramvec |
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#endif |
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static inline void init_pointer_tables(void) |
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{ |
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#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) |
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int i, j; |
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/* insert pointer tables allocated so far into the tablelist */ |
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init_pointer_table(kernel_pg_dir, TABLE_PGD); |
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for (i = 0; i < PTRS_PER_PGD; i++) { |
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pud_t *pud = (pud_t *)&kernel_pg_dir[i]; |
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pmd_t *pmd_dir; |
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if (!pud_present(*pud)) |
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continue; |
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pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]); |
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init_pointer_table(pmd_dir, TABLE_PMD); |
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for (j = 0; j < PTRS_PER_PMD; j++) { |
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pmd_t *pmd = &pmd_dir[j]; |
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pte_t *pte_dir; |
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if (!pmd_present(*pmd)) |
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continue; |
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pte_dir = (pte_t *)pmd_page_vaddr(*pmd); |
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init_pointer_table(pte_dir, TABLE_PTE); |
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} |
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} |
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#endif |
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} |
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void __init mem_init(void) |
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{ |
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/* this will put all memory onto the freelists */ |
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memblock_free_all(); |
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init_pointer_tables(); |
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}
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