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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
43#include <mm/mmu_decl.h>
44
45#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
46/* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
47#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
48#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
49#endif
50#endif
51#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
52
53phys_addr_t total_memory;
54phys_addr_t total_lowmem;
55
56#ifdef CONFIG_RELOCATABLE
57/* Used in __va()/__pa() */
58long long virt_phys_offset;
59EXPORT_SYMBOL(virt_phys_offset);
60#endif
61
62phys_addr_t lowmem_end_addr;
63
64int boot_mapsize;
65#ifdef CONFIG_PPC_PMAC
66unsigned long agp_special_page;
67EXPORT_SYMBOL(agp_special_page);
68#endif
69
70void MMU_init(void);
71
72/* max amount of low RAM to map in */
73unsigned long __max_low_memory = MAX_LOW_MEM;
74
75/*
76 * MMU_init sets up the basic memory mappings for the kernel,
77 * including both RAM and possibly some I/O regions,
78 * and sets up the page tables and the MMU hardware ready to go.
79 */
80void __init MMU_init(void)
81{
82 if (ppc_md.progress)
83 ppc_md.progress("MMU:enter", 0x111);
84
85 total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
86 lowmem_end_addr = memstart_addr + total_lowmem;
87
88#ifdef CONFIG_PPC_85xx
89 /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
90 * entries, so we need to adjust lowmem to match the amount we can map
91 * in the fixed entries */
92 adjust_total_lowmem();
93#endif /* CONFIG_PPC_85xx */
94
95 if (total_lowmem > __max_low_memory) {
96 total_lowmem = __max_low_memory;
97 lowmem_end_addr = memstart_addr + total_lowmem;
98#ifndef CONFIG_HIGHMEM
99 total_memory = total_lowmem;
100 memblock_enforce_memory_limit(total_lowmem);
101#endif /* CONFIG_HIGHMEM */
102 }
103
104 /* Initialize the MMU hardware */
105 if (ppc_md.progress)
106 ppc_md.progress("MMU:hw init", 0x300);
107 MMU_init_hw();
108
109 /* Map in all of RAM starting at KERNELBASE */
110 if (ppc_md.progress)
111 ppc_md.progress("MMU:mapin", 0x301);
112 mapin_ram();
113
114 /* Initialize early top-down ioremap allocator */
115 ioremap_bot = IOREMAP_TOP;
116
117 if (ppc_md.progress)
118 ppc_md.progress("MMU:exit", 0x211);
119
120 /* From now on, btext is no longer BAT mapped if it was at all */
121#ifdef CONFIG_BOOTX_TEXT
122 btext_unmap();
123#endif
124
125 kasan_mmu_init();
126
127 setup_kup();
128
129 /* Shortly after that, the entire linear mapping will be available */
130 memblock_set_current_limit(lowmem_end_addr);
131}
1/*
2 * PowerPC version
3 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
4 *
5 * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
6 * and Cort Dougan (PReP) (cort@cs.nmt.edu)
7 * Copyright (C) 1996 Paul Mackerras
8 * PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
9 *
10 * Derived from "arch/i386/mm/init.c"
11 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version
16 * 2 of the License, or (at your option) any later version.
17 *
18 */
19
20#include <linux/module.h>
21#include <linux/sched.h>
22#include <linux/kernel.h>
23#include <linux/errno.h>
24#include <linux/string.h>
25#include <linux/types.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/init.h>
29#include <linux/highmem.h>
30#include <linux/initrd.h>
31#include <linux/pagemap.h>
32#include <linux/memblock.h>
33#include <linux/gfp.h>
34#include <linux/slab.h>
35#include <linux/hugetlb.h>
36
37#include <asm/pgalloc.h>
38#include <asm/prom.h>
39#include <asm/io.h>
40#include <asm/pgtable.h>
41#include <asm/mmu.h>
42#include <asm/smp.h>
43#include <asm/machdep.h>
44#include <asm/btext.h>
45#include <asm/tlb.h>
46#include <asm/sections.h>
47#include <asm/hugetlb.h>
48
49#include "mmu_decl.h"
50
51#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
52/* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
53#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
54#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
55#endif
56#endif
57#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
58
59phys_addr_t total_memory;
60phys_addr_t total_lowmem;
61
62phys_addr_t memstart_addr = (phys_addr_t)~0ull;
63EXPORT_SYMBOL(memstart_addr);
64phys_addr_t kernstart_addr;
65EXPORT_SYMBOL(kernstart_addr);
66
67#ifdef CONFIG_RELOCATABLE
68/* Used in __va()/__pa() */
69long long virt_phys_offset;
70EXPORT_SYMBOL(virt_phys_offset);
71#endif
72
73phys_addr_t lowmem_end_addr;
74
75int boot_mapsize;
76#ifdef CONFIG_PPC_PMAC
77unsigned long agp_special_page;
78EXPORT_SYMBOL(agp_special_page);
79#endif
80
81void MMU_init(void);
82
83/*
84 * this tells the system to map all of ram with the segregs
85 * (i.e. page tables) instead of the bats.
86 * -- Cort
87 */
88int __map_without_bats;
89int __map_without_ltlbs;
90
91/*
92 * This tells the system to allow ioremapping memory marked as reserved.
93 */
94int __allow_ioremap_reserved;
95
96/* max amount of low RAM to map in */
97unsigned long __max_low_memory = MAX_LOW_MEM;
98
99/*
100 * Check for command-line options that affect what MMU_init will do.
101 */
102void __init MMU_setup(void)
103{
104 /* Check for nobats option (used in mapin_ram). */
105 if (strstr(boot_command_line, "nobats")) {
106 __map_without_bats = 1;
107 }
108
109 if (strstr(boot_command_line, "noltlbs")) {
110 __map_without_ltlbs = 1;
111 }
112 if (debug_pagealloc_enabled()) {
113 __map_without_bats = 1;
114 __map_without_ltlbs = 1;
115 }
116}
117
118/*
119 * MMU_init sets up the basic memory mappings for the kernel,
120 * including both RAM and possibly some I/O regions,
121 * and sets up the page tables and the MMU hardware ready to go.
122 */
123void __init MMU_init(void)
124{
125 if (ppc_md.progress)
126 ppc_md.progress("MMU:enter", 0x111);
127
128 /* parse args from command line */
129 MMU_setup();
130
131 /*
132 * Reserve gigantic pages for hugetlb. This MUST occur before
133 * lowmem_end_addr is initialized below.
134 */
135 reserve_hugetlb_gpages();
136
137 if (memblock.memory.cnt > 1) {
138#ifndef CONFIG_WII
139 memblock_enforce_memory_limit(memblock.memory.regions[0].size);
140 pr_warn("Only using first contiguous memory region\n");
141#else
142 wii_memory_fixups();
143#endif
144 }
145
146 total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
147 lowmem_end_addr = memstart_addr + total_lowmem;
148
149#ifdef CONFIG_FSL_BOOKE
150 /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
151 * entries, so we need to adjust lowmem to match the amount we can map
152 * in the fixed entries */
153 adjust_total_lowmem();
154#endif /* CONFIG_FSL_BOOKE */
155
156 if (total_lowmem > __max_low_memory) {
157 total_lowmem = __max_low_memory;
158 lowmem_end_addr = memstart_addr + total_lowmem;
159#ifndef CONFIG_HIGHMEM
160 total_memory = total_lowmem;
161 memblock_enforce_memory_limit(total_lowmem);
162#endif /* CONFIG_HIGHMEM */
163 }
164
165 /* Initialize the MMU hardware */
166 if (ppc_md.progress)
167 ppc_md.progress("MMU:hw init", 0x300);
168 MMU_init_hw();
169
170 /* Map in all of RAM starting at KERNELBASE */
171 if (ppc_md.progress)
172 ppc_md.progress("MMU:mapin", 0x301);
173 mapin_ram();
174
175 /* Initialize early top-down ioremap allocator */
176 ioremap_bot = IOREMAP_TOP;
177
178 if (ppc_md.progress)
179 ppc_md.progress("MMU:exit", 0x211);
180
181 /* From now on, btext is no longer BAT mapped if it was at all */
182#ifdef CONFIG_BOOTX_TEXT
183 btext_unmap();
184#endif
185
186 /* Shortly after that, the entire linear mapping will be available */
187 memblock_set_current_limit(lowmem_end_addr);
188}