Release 4.7 arch/powerpc/mm/init_32.c

/*
 *  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
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#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/pgalloc.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/pgtable.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 "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;


phys_addr_t memstart_addr = (phys_addr_t)~0ull;

EXPORT_SYMBOL(memstart_addr);

phys_addr_t kernstart_addr;

EXPORT_SYMBOL(kernstart_addr);

#ifdef CONFIG_RELOCATABLE_PPC32
/* 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);

/* XXX should be in current.h  -- paulus */
extern struct task_struct *current_set[NR_CPUS];

/*
 * this tells the system to map all of ram with the segregs
 * (i.e. page tables) instead of the bats.
 * -- Cort
 */

int __map_without_bats;

int __map_without_ltlbs;

/*
 * This tells the system to allow ioremapping memory marked as reserved.
 */

int __allow_ioremap_reserved;

/* max amount of low RAM to map in */

unsigned long __max_low_memory = MAX_LOW_MEM;

/*
 * Check for command-line options that affect what MMU_init will do.
 */


void __init MMU_setup(void)
{
	/* Check for nobats option (used in mapin_ram). */
	if (strstr(boot_command_line, "nobats")) {
		__map_without_bats = 1;
	}

	if (strstr(boot_command_line, "noltlbs")) {
		__map_without_ltlbs = 1;
	}
	if (debug_pagealloc_enabled()) {
		__map_without_bats = 1;
		__map_without_ltlbs = 1;
	}
}

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8
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1
16.67%
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7
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1
16.67%
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anton blanchard
2
3.70%
1
16.67%
fabian frederick
fabian frederick
1
1.85%
1
16.67%
Total
54
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6
100.00%

/*
 * 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);

	/* parse args from command line */
	MMU_setup();

	/*
         * Reserve gigantic pages for hugetlb.  This MUST occur before
         * lowmem_end_addr is initialized below.
         */
	reserve_hugetlb_gpages();

	if (memblock.memory.cnt > 1) {
#ifndef CONFIG_WII
		memblock_enforce_memory_limit(memblock.memory.regions[0].size);
		printk(KERN_WARNING "Only using first contiguous memory region");
#else
		wii_memory_fixups();
#endif
	}

	total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
	lowmem_end_addr = memstart_addr + total_lowmem;

#ifdef CONFIG_FSL_BOOKE
	/* 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_FSL_BOOKE */

	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

	/* Shortly after that, the entire linear mapping will be available */
	memblock_set_current_limit(lowmem_end_addr);
}
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17
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3
23.08%
kumar gala
kumar gala
16
7.84%
2
15.38%
albert herranz
albert herranz
10
4.90%
1
7.69%
tejun heo
tejun heo
9
4.41%
1
7.69%
becky bruce
becky bruce
4
1.96%
1
7.69%
yinghai lu
yinghai lu
4
1.96%
1
7.69%
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scott wood
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0.49%
1
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paul mackerras
334
70.17%
4
14.29%
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kumar gala
39
8.19%
3
10.71%
benjamin herrenschmidt
benjamin herrenschmidt
25
5.25%
4
14.29%
suzuki k poulose
suzuki k poulose
15
3.15%
1
3.57%
albert herranz
albert herranz
14
2.94%
2
7.14%
becky bruce
becky bruce
13
2.73%
1
3.57%
tejun heo
tejun heo
12
2.52%
2
7.14%
joonsoo kim
joonsoo kim
7
1.47%
1
3.57%
yinghai lu
yinghai lu
5
1.05%
1
3.57%
david s. miller
david s. miller
2
0.42%
1
3.57%
stefan roese
stefan roese
2
0.42%
1
3.57%
anton blanchard
anton blanchard
2
0.42%
1
3.57%
scott wood
scott wood
1
0.21%
1
3.57%
uwe kleine-koenig
uwe kleine-koenig
1
0.21%
1
3.57%
fabian frederick
fabian frederick
1
0.21%
1
3.57%
dale farnsworth
dale farnsworth
1
0.21%
1
3.57%
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david gibson
1
0.21%
1
3.57%
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paul bolle
1
0.21%
1
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Total
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