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103 lines
2.6 KiB
103 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/arch/h8300/mm/init.c |
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* |
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* Copyright (C) 1998 D. Jeff Dionne <[email protected]>, |
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* Kenneth Albanowski <[email protected]>, |
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* Copyright (C) 2000 Lineo, Inc. (www.lineo.com) |
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* |
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* Based on: |
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* |
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* linux/arch/m68knommu/mm/init.c |
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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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* JAN/1999 -- hacked to support ColdFire ([email protected]) |
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* DEC/2000 -- linux 2.4 support <[email protected]> |
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*/ |
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#include <linux/signal.h> |
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#include <linux/sched.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/string.h> |
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#include <linux/types.h> |
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#include <linux/ptrace.h> |
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#include <linux/mman.h> |
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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/highmem.h> |
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#include <linux/pagemap.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 <asm/segment.h> |
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#include <asm/page.h> |
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#include <asm/sections.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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unsigned long empty_zero_page; |
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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 og the world. |
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*/ |
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unsigned long start_mem = PAGE_ALIGN(memory_start); |
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unsigned long end_mem = memory_end & PAGE_MASK; |
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pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", |
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start_mem, end_mem); |
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/* |
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* Initialize the bad page table and bad page to point |
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* to a couple of allocated pages. |
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*/ |
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empty_zero_page = (unsigned long)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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/* |
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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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pr_debug("before free_area_init\n"); |
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pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", |
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start_mem, end_mem); |
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{ |
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unsigned long max_zone_pfn[MAX_NR_ZONES] = {0, }; |
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max_zone_pfn[ZONE_NORMAL] = end_mem >> PAGE_SHIFT; |
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free_area_init(max_zone_pfn); |
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} |
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} |
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void __init mem_init(void) |
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{ |
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pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); |
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high_memory = (void *) (memory_end & PAGE_MASK); |
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max_mapnr = MAP_NR(high_memory); |
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/* this will put all low memory onto the freelists */ |
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memblock_free_all(); |
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mem_init_print_info(NULL); |
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}
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