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Linux/arch/powerpc/mm/init_32.c

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  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/bootmem.h>
 30 #include <linux/highmem.h>
 31 #include <linux/initrd.h>
 32 #include <linux/pagemap.h>
 33 #include <linux/memblock.h>
 34 #include <linux/gfp.h>
 35 #include <linux/slab.h>
 36 #include <linux/hugetlb.h>
 37 
 38 #include <asm/pgalloc.h>
 39 #include <asm/prom.h>
 40 #include <asm/io.h>
 41 #include <asm/pgtable.h>
 42 #include <asm/mmu.h>
 43 #include <asm/smp.h>
 44 #include <asm/machdep.h>
 45 #include <asm/btext.h>
 46 #include <asm/tlb.h>
 47 #include <asm/sections.h>
 48 #include <asm/hugetlb.h>
 49 
 50 #include "mmu_decl.h"
 51 
 52 #if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
 53 /* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
 54 #if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
 55 #error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_KERNEL_START"
 56 #endif
 57 #endif
 58 #define MAX_LOW_MEM     CONFIG_LOWMEM_SIZE
 59 
 60 phys_addr_t total_memory;
 61 phys_addr_t total_lowmem;
 62 
 63 phys_addr_t memstart_addr = (phys_addr_t)~0ull;
 64 EXPORT_SYMBOL(memstart_addr);
 65 phys_addr_t kernstart_addr;
 66 EXPORT_SYMBOL(kernstart_addr);
 67 
 68 #ifdef CONFIG_RELOCATABLE_PPC32
 69 /* Used in __va()/__pa() */
 70 long long virt_phys_offset;
 71 EXPORT_SYMBOL(virt_phys_offset);
 72 #endif
 73 
 74 phys_addr_t lowmem_end_addr;
 75 
 76 int boot_mapsize;
 77 #ifdef CONFIG_PPC_PMAC
 78 unsigned long agp_special_page;
 79 EXPORT_SYMBOL(agp_special_page);
 80 #endif
 81 
 82 void MMU_init(void);
 83 
 84 /* XXX should be in current.h  -- paulus */
 85 extern struct task_struct *current_set[NR_CPUS];
 86 
 87 /*
 88  * this tells the system to map all of ram with the segregs
 89  * (i.e. page tables) instead of the bats.
 90  * -- Cort
 91  */
 92 int __map_without_bats;
 93 int __map_without_ltlbs;
 94 
 95 /*
 96  * This tells the system to allow ioremapping memory marked as reserved.
 97  */
 98 int __allow_ioremap_reserved;
 99 
100 /* max amount of low RAM to map in */
101 unsigned long __max_low_memory = MAX_LOW_MEM;
102 
103 /*
104  * Check for command-line options that affect what MMU_init will do.
105  */
106 void MMU_setup(void)
107 {
108         /* Check for nobats option (used in mapin_ram). */
109         if (strstr(cmd_line, "nobats")) {
110                 __map_without_bats = 1;
111         }
112 
113         if (strstr(cmd_line, "noltlbs")) {
114                 __map_without_ltlbs = 1;
115         }
116 #ifdef CONFIG_DEBUG_PAGEALLOC
117         __map_without_bats = 1;
118         __map_without_ltlbs = 1;
119 #endif
120 }
121 
122 /*
123  * MMU_init sets up the basic memory mappings for the kernel,
124  * including both RAM and possibly some I/O regions,
125  * and sets up the page tables and the MMU hardware ready to go.
126  */
127 void __init MMU_init(void)
128 {
129         if (ppc_md.progress)
130                 ppc_md.progress("MMU:enter", 0x111);
131 
132         /* parse args from command line */
133         MMU_setup();
134 
135         /*
136          * Reserve gigantic pages for hugetlb.  This MUST occur before
137          * lowmem_end_addr is initialized below.
138          */
139         reserve_hugetlb_gpages();
140 
141         if (memblock.memory.cnt > 1) {
142 #ifndef CONFIG_WII
143                 memblock_enforce_memory_limit(memblock.memory.regions[0].size);
144                 printk(KERN_WARNING "Only using first contiguous memory region");
145 #else
146                 wii_memory_fixups();
147 #endif
148         }
149 
150         total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
151         lowmem_end_addr = memstart_addr + total_lowmem;
152 
153 #ifdef CONFIG_FSL_BOOKE
154         /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
155          * entries, so we need to adjust lowmem to match the amount we can map
156          * in the fixed entries */
157         adjust_total_lowmem();
158 #endif /* CONFIG_FSL_BOOKE */
159 
160         if (total_lowmem > __max_low_memory) {
161                 total_lowmem = __max_low_memory;
162                 lowmem_end_addr = memstart_addr + total_lowmem;
163 #ifndef CONFIG_HIGHMEM
164                 total_memory = total_lowmem;
165                 memblock_enforce_memory_limit(total_lowmem);
166 #endif /* CONFIG_HIGHMEM */
167         }
168 
169         /* Initialize the MMU hardware */
170         if (ppc_md.progress)
171                 ppc_md.progress("MMU:hw init", 0x300);
172         MMU_init_hw();
173 
174         /* Map in all of RAM starting at KERNELBASE */
175         if (ppc_md.progress)
176                 ppc_md.progress("MMU:mapin", 0x301);
177         mapin_ram();
178 
179         /* Initialize early top-down ioremap allocator */
180         ioremap_bot = IOREMAP_TOP;
181 
182         /* Map in I/O resources */
183         if (ppc_md.progress)
184                 ppc_md.progress("MMU:setio", 0x302);
185 
186         if (ppc_md.progress)
187                 ppc_md.progress("MMU:exit", 0x211);
188 
189         /* From now on, btext is no longer BAT mapped if it was at all */
190 #ifdef CONFIG_BOOTX_TEXT
191         btext_unmap();
192 #endif
193 
194         /* Shortly after that, the entire linear mapping will be available */
195         memblock_set_current_limit(lowmem_end_addr);
196 }
197 
198 /* This is only called until mem_init is done. */
199 void __init *early_get_page(void)
200 {
201         if (init_bootmem_done)
202                 return alloc_bootmem_pages(PAGE_SIZE);
203         else
204                 return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
205 }
206 
207 #ifdef CONFIG_8xx /* No 8xx specific .c file to put that in ... */
208 void setup_initial_memory_limit(phys_addr_t first_memblock_base,
209                                 phys_addr_t first_memblock_size)
210 {
211         /* We don't currently support the first MEMBLOCK not mapping 0
212          * physical on those processors
213          */
214         BUG_ON(first_memblock_base != 0);
215 
216 #ifdef CONFIG_PIN_TLB
217         /* 8xx can only access 24MB at the moment */
218         memblock_set_current_limit(min_t(u64, first_memblock_size, 0x01800000));
219 #else
220         /* 8xx can only access 8MB at the moment */
221         memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000));
222 #endif
223 }
224 #endif /* CONFIG_8xx */
225 

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