mirror of https://gitee.com/openkylin/linux.git
189 lines
4.8 KiB
C
189 lines
4.8 KiB
C
/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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* PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/module.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/mm.h>
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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/highmem.h>
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#include <linux/initrd.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 <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <asm/pgalloc.h>
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#include <asm/prom.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/btext.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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#include <asm/hugetlb.h>
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#include "mmu_decl.h"
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#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
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/* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
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#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
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#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
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#endif
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#endif
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#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
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phys_addr_t total_memory;
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phys_addr_t total_lowmem;
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phys_addr_t memstart_addr = (phys_addr_t)~0ull;
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EXPORT_SYMBOL(memstart_addr);
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phys_addr_t kernstart_addr;
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EXPORT_SYMBOL(kernstart_addr);
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#ifdef CONFIG_RELOCATABLE_PPC32
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/* Used in __va()/__pa() */
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long long virt_phys_offset;
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EXPORT_SYMBOL(virt_phys_offset);
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#endif
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phys_addr_t lowmem_end_addr;
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int boot_mapsize;
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#ifdef CONFIG_PPC_PMAC
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unsigned long agp_special_page;
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EXPORT_SYMBOL(agp_special_page);
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#endif
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void MMU_init(void);
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/*
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* this tells the system to map all of ram with the segregs
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* (i.e. page tables) instead of the bats.
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* -- Cort
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*/
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int __map_without_bats;
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int __map_without_ltlbs;
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/*
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* This tells the system to allow ioremapping memory marked as reserved.
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*/
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int __allow_ioremap_reserved;
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/* max amount of low RAM to map in */
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unsigned long __max_low_memory = MAX_LOW_MEM;
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/*
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* Check for command-line options that affect what MMU_init will do.
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*/
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void __init MMU_setup(void)
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{
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/* Check for nobats option (used in mapin_ram). */
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if (strstr(boot_command_line, "nobats")) {
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__map_without_bats = 1;
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}
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if (strstr(boot_command_line, "noltlbs")) {
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__map_without_ltlbs = 1;
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}
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if (debug_pagealloc_enabled()) {
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__map_without_bats = 1;
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__map_without_ltlbs = 1;
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}
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}
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/*
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* MMU_init sets up the basic memory mappings for the kernel,
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* including both RAM and possibly some I/O regions,
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* and sets up the page tables and the MMU hardware ready to go.
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*/
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void __init MMU_init(void)
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{
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if (ppc_md.progress)
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ppc_md.progress("MMU:enter", 0x111);
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/* parse args from command line */
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MMU_setup();
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/*
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* Reserve gigantic pages for hugetlb. This MUST occur before
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* lowmem_end_addr is initialized below.
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*/
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reserve_hugetlb_gpages();
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if (memblock.memory.cnt > 1) {
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#ifndef CONFIG_WII
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memblock_enforce_memory_limit(memblock.memory.regions[0].size);
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printk(KERN_WARNING "Only using first contiguous memory region");
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#else
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wii_memory_fixups();
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#endif
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}
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total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
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lowmem_end_addr = memstart_addr + total_lowmem;
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#ifdef CONFIG_FSL_BOOKE
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/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
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* entries, so we need to adjust lowmem to match the amount we can map
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* in the fixed entries */
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adjust_total_lowmem();
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#endif /* CONFIG_FSL_BOOKE */
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if (total_lowmem > __max_low_memory) {
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total_lowmem = __max_low_memory;
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lowmem_end_addr = memstart_addr + total_lowmem;
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#ifndef CONFIG_HIGHMEM
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total_memory = total_lowmem;
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memblock_enforce_memory_limit(total_lowmem);
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#endif /* CONFIG_HIGHMEM */
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}
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/* Initialize the MMU hardware */
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if (ppc_md.progress)
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ppc_md.progress("MMU:hw init", 0x300);
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MMU_init_hw();
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/* Map in all of RAM starting at KERNELBASE */
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if (ppc_md.progress)
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ppc_md.progress("MMU:mapin", 0x301);
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mapin_ram();
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/* Initialize early top-down ioremap allocator */
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ioremap_bot = IOREMAP_TOP;
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if (ppc_md.progress)
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ppc_md.progress("MMU:exit", 0x211);
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/* From now on, btext is no longer BAT mapped if it was at all */
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#ifdef CONFIG_BOOTX_TEXT
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btext_unmap();
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#endif
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/* Shortly after that, the entire linear mapping will be available */
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memblock_set_current_limit(lowmem_end_addr);
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}
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