307cfe7153
When using 64K pages with a separate cpio rootfs, U-Boot will align the rootfs on a 4K page boundary. When the memory is reserved, and subsequent early memblock_alloc is called, it will allocate memory between the 64K page alignment and reserved memory. When the reserved memory is subsequently freed, it is done so by pages, causing the early memblock_alloc requests to be re-used, which in my case, caused the device-tree to be clobbered. This patch forces the reserved memory for initrd to be kernel page aligned, and will move the device tree if it overlaps with the range extension of initrd. This patch will also consolidate the identical function free_initrd_mem() from mm/init_32.c, init_64.c to mm/mem.c, and adds the same range extension when freeing initrd. free_initrd_mem() is also moved to the __init section. Many thanks to Milton Miller for his input on this patch. [BenH: Fixed build without CONFIG_BLK_DEV_INITRD] Signed-off-by: Dave Carroll <dcarroll@astekcorp.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
239 lines
5.9 KiB
C
239 lines
5.9 KiB
C
/*
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* PowerPC version
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
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* and Cort Dougan (PReP) (cort@cs.nmt.edu)
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* Copyright (C) 1996 Paul Mackerras
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* PPC44x/36-bit changes by Matt Porter (mporter@mvista.com)
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*
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* Derived from "arch/i386/mm/init.c"
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/initrd.h>
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#include <linux/pagemap.h>
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#include <linux/memblock.h>
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#include <linux/gfp.h>
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#include <asm/pgalloc.h>
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#include <asm/prom.h>
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#include <asm/io.h>
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#include <asm/pgtable.h>
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#include <asm/mmu.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/btext.h>
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#include <asm/tlb.h>
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#include <asm/sections.h>
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#include <asm/system.h>
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#include "mmu_decl.h"
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#if defined(CONFIG_KERNEL_START_BOOL) || defined(CONFIG_LOWMEM_SIZE_BOOL)
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/* The amount of lowmem must be within 0xF0000000 - KERNELBASE. */
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#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - PAGE_OFFSET))
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#error "You must adjust CONFIG_LOWMEM_SIZE or CONFIG_START_KERNEL"
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#endif
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#endif
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#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
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phys_addr_t total_memory;
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phys_addr_t total_lowmem;
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phys_addr_t memstart_addr = (phys_addr_t)~0ull;
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EXPORT_SYMBOL(memstart_addr);
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phys_addr_t kernstart_addr;
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EXPORT_SYMBOL(kernstart_addr);
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phys_addr_t lowmem_end_addr;
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int boot_mapsize;
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#ifdef CONFIG_PPC_PMAC
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unsigned long agp_special_page;
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EXPORT_SYMBOL(agp_special_page);
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#endif
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void MMU_init(void);
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/* XXX should be in current.h -- paulus */
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extern struct task_struct *current_set[NR_CPUS];
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/*
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* this tells the system to map all of ram with the segregs
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* (i.e. page tables) instead of the bats.
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* -- Cort
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*/
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int __map_without_bats;
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int __map_without_ltlbs;
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/*
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* This tells the system to allow ioremapping memory marked as reserved.
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*/
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int __allow_ioremap_reserved;
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/* max amount of low RAM to map in */
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unsigned long __max_low_memory = MAX_LOW_MEM;
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/*
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* Check for command-line options that affect what MMU_init will do.
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*/
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void MMU_setup(void)
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{
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/* Check for nobats option (used in mapin_ram). */
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if (strstr(cmd_line, "nobats")) {
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__map_without_bats = 1;
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}
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if (strstr(cmd_line, "noltlbs")) {
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__map_without_ltlbs = 1;
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}
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#ifdef CONFIG_DEBUG_PAGEALLOC
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__map_without_bats = 1;
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__map_without_ltlbs = 1;
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#endif
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}
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/*
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* MMU_init sets up the basic memory mappings for the kernel,
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* including both RAM and possibly some I/O regions,
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* and sets up the page tables and the MMU hardware ready to go.
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*/
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void __init MMU_init(void)
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{
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if (ppc_md.progress)
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ppc_md.progress("MMU:enter", 0x111);
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/* parse args from command line */
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MMU_setup();
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if (memblock.memory.cnt > 1) {
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#ifndef CONFIG_WII
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memblock.memory.cnt = 1;
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memblock_analyze();
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printk(KERN_WARNING "Only using first contiguous memory region");
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#else
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wii_memory_fixups();
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#endif
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}
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total_lowmem = total_memory = memblock_end_of_DRAM() - memstart_addr;
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lowmem_end_addr = memstart_addr + total_lowmem;
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#ifdef CONFIG_FSL_BOOKE
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/* Freescale Book-E parts expect lowmem to be mapped by fixed TLB
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* entries, so we need to adjust lowmem to match the amount we can map
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* in the fixed entries */
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adjust_total_lowmem();
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#endif /* CONFIG_FSL_BOOKE */
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if (total_lowmem > __max_low_memory) {
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total_lowmem = __max_low_memory;
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lowmem_end_addr = memstart_addr + total_lowmem;
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#ifndef CONFIG_HIGHMEM
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total_memory = total_lowmem;
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memblock_enforce_memory_limit(total_lowmem);
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memblock_analyze();
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#endif /* CONFIG_HIGHMEM */
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}
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/* Initialize the MMU hardware */
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if (ppc_md.progress)
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ppc_md.progress("MMU:hw init", 0x300);
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MMU_init_hw();
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/* Map in all of RAM starting at KERNELBASE */
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if (ppc_md.progress)
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ppc_md.progress("MMU:mapin", 0x301);
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mapin_ram();
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/* Initialize early top-down ioremap allocator */
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ioremap_bot = IOREMAP_TOP;
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/* Map in I/O resources */
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if (ppc_md.progress)
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ppc_md.progress("MMU:setio", 0x302);
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if (ppc_md.progress)
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ppc_md.progress("MMU:exit", 0x211);
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/* From now on, btext is no longer BAT mapped if it was at all */
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#ifdef CONFIG_BOOTX_TEXT
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btext_unmap();
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#endif
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/* Shortly after that, the entire linear mapping will be available */
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memblock_set_current_limit(lowmem_end_addr);
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}
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/* This is only called until mem_init is done. */
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void __init *early_get_page(void)
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{
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if (init_bootmem_done)
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return alloc_bootmem_pages(PAGE_SIZE);
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else
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return __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
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}
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/* Free up now-unused memory */
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static void free_sec(unsigned long start, unsigned long end, const char *name)
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{
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unsigned long cnt = 0;
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while (start < end) {
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ClearPageReserved(virt_to_page(start));
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init_page_count(virt_to_page(start));
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free_page(start);
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cnt++;
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start += PAGE_SIZE;
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}
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if (cnt) {
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printk(" %ldk %s", cnt << (PAGE_SHIFT - 10), name);
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totalram_pages += cnt;
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}
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}
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void free_initmem(void)
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{
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#define FREESEC(TYPE) \
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free_sec((unsigned long)(&__ ## TYPE ## _begin), \
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(unsigned long)(&__ ## TYPE ## _end), \
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#TYPE);
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printk ("Freeing unused kernel memory:");
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FREESEC(init);
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printk("\n");
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ppc_md.progress = NULL;
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#undef FREESEC
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}
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#ifdef CONFIG_8xx /* No 8xx specific .c file to put that in ... */
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void setup_initial_memory_limit(phys_addr_t first_memblock_base,
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phys_addr_t first_memblock_size)
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{
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/* We don't currently support the first MEMBLOCK not mapping 0
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* physical on those processors
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*/
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BUG_ON(first_memblock_base != 0);
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/* 8xx can only access 8MB at the moment */
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memblock_set_current_limit(min_t(u64, first_memblock_size, 0x00800000));
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}
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#endif /* CONFIG_8xx */
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