| | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| | 2 | /* |
| | 3 | * PowerPC version |
| | 4 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) |
| | 5 | * |
| | 6 | * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au) |
| | 7 | * and Cort Dougan (PReP) (cort@cs.nmt.edu) |
| | 8 | * Copyright (C) 1996 Paul Mackerras |
| | 9 | * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com) |
| | 10 | * |
| | 11 | * Derived from "arch/i386/mm/init.c" |
| | 12 | * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds |
| | 13 | */ |
| | 14 | |
| | 15 | #include <linux/module.h> |
| | 16 | #include <linux/sched.h> |
| | 17 | #include <linux/kernel.h> |
| | 18 | #include <linux/errno.h> |
| | 19 | #include <linux/string.h> |
| | 20 | #include <linux/types.h> |
| | 21 | #include <linux/mm.h> |
| | 22 | #include <linux/stddef.h> |
| | 23 | #include <linux/init.h> |
| | 24 | #include <linux/highmem.h> |
| | 25 | #include <linux/initrd.h> |
| | 26 | #include <linux/pagemap.h> |
| | 27 | #include <linux/memblock.h> |
| | 28 | #include <linux/gfp.h> |
| | 29 | #include <linux/slab.h> |
| | 30 | #include <linux/hugetlb.h> |
| | 31 | |
| | 32 | #include <asm/io.h> |
| | 33 | #include <asm/mmu.h> |
| | 34 | #include <asm/smp.h> |
| | 35 | #include <asm/machdep.h> |
| | 36 | #include <asm/btext.h> |
| | 37 | #include <asm/tlb.h> |
| | 38 | #include <asm/sections.h> |
| | 39 | #include <asm/hugetlb.h> |
| | 40 | #include <asm/kup.h> |
| | 41 | #include <asm/kasan.h> |
| | 42 | #include <asm/fixmap.h> |
| | 43 | |
| | 44 | #include <mm/mmu_decl.h> |
| | 45 | |
| | 46 | #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL) |
| | 47 | /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */ |
| | 48 | #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET)) |
| | 49 | #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START" |
| | 50 | #endif |
| | 51 | #endif |
| | 52 | #define MAX_LOW_MEM CONFIG_LOWMEM_SIZE |
| | 53 | |
| | 54 | phys_addr_t total_memory; |
| | 55 | phys_addr_t total_lowmem; |
| | 56 | |
| | 57 | #ifdef CONFIG_RELOCATABLE |
| | 58 | /* Used in __va()/__pa() */ |
| | 59 | long long virt_phys_offset; |
| | 60 | EXPORT_SYMBOL(virt_phys_offset); |
| | 61 | #endif |
| | 62 | |
| | 63 | phys_addr_t lowmem_end_addr; |
| | 64 | |
| | 65 | int boot_mapsize; |
| | 66 | #ifdef CONFIG_PPC_PMAC |
| | 67 | unsigned long agp_special_page; |
| | 68 | EXPORT_SYMBOL(agp_special_page); |
| | 69 | #endif |
| | 70 | |
| | 71 | void MMU_init(void); |
| | 72 | |
| | 73 | /* max amount of low RAM to map in */ |
| | 74 | unsigned long __max_low_memory = MAX_LOW_MEM; |
| | 75 | |
| | 76 | /* |
| | 77 | * MMU_init sets up the basic memory mappings for the kernel, |
| | 78 | * including both RAM and possibly some I/O regions, |
| | 79 | * and sets up the page tables and the MMU hardware ready to go. |
| | 80 | */ |
| | 81 | void __init MMU_init(void) |
| | 82 | { |
| | 83 | if (ppc_md.progress) |
| | 84 | ppc_md.progress("MMU:enter", 0x111); |
| | 85 | |
| | 86 | total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr; |
| | 87 | lowmem_end_addr = memstart_addr + total_lowmem; |
| | 88 | |
| | 89 | #ifdef CONFIG_PPC_85xx |
| | 90 | /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB |
| | 91 | * entries, so we need to adjust lowmem to match the amount we can map |
| | 92 | * in the fixed entries */ |
| | 93 | adjust_total_lowmem(); |
| | 94 | #endif /* CONFIG_PPC_85xx */ |
| | 95 | |
| | 96 | if (total_lowmem > __max_low_memory) { |
| | 97 | total_lowmem = __max_low_memory; |
| | 98 | lowmem_end_addr = memstart_addr + total_lowmem; |
| | 99 | #ifndef CONFIG_HIGHMEM |
| | 100 | total_memory = total_lowmem; |
| | 101 | memblock_enforce_memory_limit(total_lowmem); |
| | 102 | #endif /* CONFIG_HIGHMEM */ |
| | 103 | } |
| | 104 | |
| | 105 | /* Initialize the MMU hardware */ |
| | 106 | if (ppc_md.progress) |
| | 107 | ppc_md.progress("MMU:hw init", 0x300); |
| | 108 | MMU_init_hw(); |
| | 109 | |
| | 110 | /* Map in all of RAM starting at KERNELBASE */ |
| | 111 | if (ppc_md.progress) |
| | 112 | ppc_md.progress("MMU:mapin", 0x301); |
| | 113 | mapin_ram(); |
| | 114 | |
| | 115 | /* Initialize early top-down ioremap allocator */ |
| | 116 | ioremap_bot = IOREMAP_TOP; |
| | 117 | |
| | 118 | if (ppc_md.progress) |
| | 119 | ppc_md.progress("MMU:exit", 0x211); |
| | 120 | |
| | 121 | /* From now on, btext is no longer BAT mapped if it was at all */ |
| | 122 | #ifdef CONFIG_BOOTX_TEXT |
| | 123 | btext_unmap(); |
| | 124 | #endif |
| | 125 | |
| | 126 | kasan_mmu_init(); |
| | 127 | |
| | 128 | setup_kup(); |
| | 129 | |
| | 130 | update_mmu_feature_fixups(MMU_FTR_KUAP); |
| | 131 | |
| | 132 | /* Shortly after that, the entire linear mapping will be available */ |
| | 133 | memblock_set_current_limit(lowmem_end_addr); |
| | 134 | } |
projects / linux-2.6-block.git / blame_incremental