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181 lines
4.6 KiB
181 lines
4.6 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/bootmem.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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#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
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extern void init_pointer_table(unsigned long ptable);
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extern pmd_t *zero_pgtable;
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#endif
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#ifdef CONFIG_MMU
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pg_data_t pg_data_map[MAX_NUMNODES];
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EXPORT_SYMBOL(pg_data_map);
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int m68k_virt_to_node_shift;
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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pg_data_t *pg_data_table[65];
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EXPORT_SYMBOL(pg_data_table);
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#endif
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void __init m68k_setup_node(int node)
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{
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#ifndef CONFIG_SINGLE_MEMORY_CHUNK
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struct m68k_mem_info *info = m68k_memory + node;
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int i, end;
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i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
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end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
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for (; i <= end; i++) {
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if (pg_data_table[i])
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pr_warn("overlap at %u for chunk %u\n", i, node);
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pg_data_table[i] = pg_data_map + node;
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}
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#endif
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pg_data_map[node].bdata = bootmem_node_data + node;
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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 zones_size[MAX_NR_ZONES] = { 0, };
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high_memory = (void *) end_mem;
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empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
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/*
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* Set up SFC/DFC registers (user data space).
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*/
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set_fs (USER_DS);
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zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
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free_area_init(zones_size);
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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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void __init print_memmap(void)
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{
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#define UL(x) ((unsigned long) (x))
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#define MLK(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 10
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#define MLM(b, t) UL(b), UL(t), (UL(t) - UL(b)) >> 20
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#define MLK_ROUNDUP(b, t) b, t, DIV_ROUND_UP(((t) - (b)), 1024)
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pr_notice("Virtual kernel memory layout:\n"
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" vector : 0x%08lx - 0x%08lx (%4ld KiB)\n"
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" kmap : 0x%08lx - 0x%08lx (%4ld MiB)\n"
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MiB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MiB)\n"
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" .init : 0x%p" " - 0x%p" " (%4d KiB)\n"
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" .text : 0x%p" " - 0x%p" " (%4d KiB)\n"
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" .data : 0x%p" " - 0x%p" " (%4d KiB)\n"
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" .bss : 0x%p" " - 0x%p" " (%4d KiB)\n",
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MLK(VECTORS, VECTORS + 256),
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MLM(KMAP_START, KMAP_END),
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MLM(VMALLOC_START, VMALLOC_END),
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MLM(PAGE_OFFSET, (unsigned long)high_memory),
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MLK_ROUNDUP(__init_begin, __init_end),
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MLK_ROUNDUP(_stext, _etext),
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MLK_ROUNDUP(_sdata, _edata),
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MLK_ROUNDUP(__bss_start, __bss_stop));
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}
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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;
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/* insert pointer tables allocated so far into the tablelist */
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init_pointer_table((unsigned long)kernel_pg_dir);
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for (i = 0; i < PTRS_PER_PGD; i++) {
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if (pgd_present(kernel_pg_dir[i]))
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init_pointer_table(__pgd_page(kernel_pg_dir[i]));
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}
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/* insert also pointer table that we used to unmap the zero page */
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if (zero_pgtable)
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init_pointer_table((unsigned long)zero_pgtable);
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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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free_all_bootmem();
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init_pointer_tables();
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mem_init_print_info(NULL);
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print_memmap();
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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#endif
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