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179 lines
4.4 KiB
179 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PowerPC version |
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* Copyright (C) 1995-1996 Gary Thomas ([email protected]) |
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* |
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* Modifications by Paul Mackerras (PowerMac) ([email protected]) |
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* and Cort Dougan (PReP) ([email protected]) |
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* Copyright (C) 1996 Paul Mackerras |
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* PPC44x/36-bit changes by Matt Porter ([email protected]) |
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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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#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/prom.h> |
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#include <asm/io.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 <asm/kup.h> |
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#include <asm/kasan.h> |
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#include <mm/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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#ifdef CONFIG_RELOCATABLE |
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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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/* 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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static 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 (IS_ENABLED(CONFIG_PPC_8xx)) |
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return; |
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if (debug_pagealloc_enabled()) |
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__map_without_ltlbs = 1; |
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if (strict_kernel_rwx_enabled()) |
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__map_without_ltlbs = 1; |
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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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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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pr_warn("Only using first contiguous memory region\n"); |
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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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kasan_mmu_init(); |
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setup_kup(); |
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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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