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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | // SPDX-License-Identifier: GPL-2.0-or-later /* * PowerPC version * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) * * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) * and Cort Dougan (PReP) (cort@cs.nmt.edu) * Copyright (C) 1996 Paul Mackerras * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) * * Derived from "arch/i386/mm/init.c" * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds */ #include <linux/module.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/types.h> #include <linux/mm.h> #include <linux/stddef.h> #include <linux/init.h> #include <linux/highmem.h> #include <linux/initrd.h> #include <linux/pagemap.h> #include <linux/memblock.h> #include <linux/gfp.h> #include <linux/slab.h> #include <linux/hugetlb.h> #include <asm/io.h> #include <asm/mmu.h> #include <asm/smp.h> #include <asm/machdep.h> #include <asm/btext.h> #include <asm/tlb.h> #include <asm/sections.h> #include <asm/hugetlb.h> #include <asm/kup.h> #include <asm/kasan.h> #include <asm/fixmap.h> #include <mm/mmu_decl.h> #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" #endif #endif #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE phys_addr_t total_memory; phys_addr_t total_lowmem; #ifdef CONFIG_RELOCATABLE /* Used in __va()/__pa() */ long long virt_phys_offset; EXPORT_SYMBOL(virt_phys_offset); #endif phys_addr_t lowmem_end_addr; int boot_mapsize; #ifdef CONFIG_PPC_PMAC unsigned long agp_special_page; EXPORT_SYMBOL(agp_special_page); #endif void MMU_init(void); /* max amount of low RAM to map in */ unsigned long __max_low_memory = MAX_LOW_MEM; /* * MMU_init sets up the basic memory mappings for the kernel, * including both RAM and possibly some I/O regions, * and sets up the page tables and the MMU hardware ready to go. */ void __init MMU_init(void) { if (ppc_md.progress) ppc_md.progress("MMU:enter", 0x111); total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; lowmem_end_addr = memstart_addr + total_lowmem; #ifdef CONFIG_PPC_85xx /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB * entries, so we need to adjust lowmem to match the amount we can map * in the fixed entries */ adjust_total_lowmem(); #endif /* CONFIG_PPC_85xx */ if (total_lowmem > __max_low_memory) { total_lowmem = __max_low_memory; lowmem_end_addr = memstart_addr + total_lowmem; #ifndef CONFIG_HIGHMEM total_memory = total_lowmem; memblock_enforce_memory_limit(total_lowmem); #endif /* CONFIG_HIGHMEM */ } /* Initialize the MMU hardware */ if (ppc_md.progress) ppc_md.progress("MMU:hw init", 0x300); MMU_init_hw(); /* Map in all of RAM starting at KERNELBASE */ if (ppc_md.progress) ppc_md.progress("MMU:mapin", 0x301); mapin_ram(); /* Initialize early top-down ioremap allocator */ ioremap_bot = IOREMAP_TOP; if (ppc_md.progress) ppc_md.progress("MMU:exit", 0x211); /* From now on, btext is no longer BAT mapped if it was at all */ #ifdef CONFIG_BOOTX_TEXT btext_unmap(); #endif kasan_mmu_init(); setup_kup(); update_mmu_feature_fixups(MMU_FTR_KUAP); /* Shortly after that, the entire linear mapping will be available */ memblock_set_current_limit(lowmem_end_addr); } |