2005-09-26 02:04:21 -04:00
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/*
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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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* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
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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/config.h>
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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 <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/mmu_context.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/bootinfo.h>
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#include <asm/prom.h>
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#include "mem_pieces.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 ammount of lowmem must be within 0xF0000000 - KERNELBASE. */
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#if (CONFIG_LOWMEM_SIZE > (0xF0000000 - KERNELBASE))
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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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DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
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unsigned long total_memory;
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unsigned long total_lowmem;
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unsigned long ppc_memstart;
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unsigned long ppc_memoffset = PAGE_OFFSET;
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int mem_init_done;
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int init_bootmem_done;
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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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#endif
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extern char _end[];
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extern char etext[], _stext[];
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extern char __init_begin, __init_end;
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#ifdef CONFIG_HIGHMEM
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pte_t *kmap_pte;
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pgprot_t kmap_prot;
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EXPORT_SYMBOL(kmap_prot);
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EXPORT_SYMBOL(kmap_pte);
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#endif
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void MMU_init(void);
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void set_phys_avail(unsigned long total_ram);
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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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char *klimit = _end;
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struct mem_pieces phys_avail;
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struct device_node *memory_node;
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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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/* max amount of RAM to use */
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unsigned long __max_memory;
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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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* Read in a property describing some pieces of memory.
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*/
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static int __init get_mem_prop(char *name, struct mem_pieces *mp)
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{
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struct reg_property *rp;
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int i, s;
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unsigned int *ip;
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int nac = prom_n_addr_cells(memory_node);
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int nsc = prom_n_size_cells(memory_node);
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ip = (unsigned int *) get_property(memory_node, name, &s);
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if (ip == NULL) {
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printk(KERN_ERR "error: couldn't get %s property on /memory\n",
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name);
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return 0;
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}
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s /= (nsc + nac) * 4;
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rp = mp->regions;
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for (i = 0; i < s; ++i, ip += nac+nsc) {
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if (nac >= 2 && ip[nac-2] != 0)
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continue;
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rp->address = ip[nac-1];
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if (nsc >= 2 && ip[nac+nsc-2] != 0)
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rp->size = ~0U;
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else
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rp->size = ip[nac+nsc-1];
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++rp;
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}
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mp->n_regions = rp - mp->regions;
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/* Make sure the pieces are sorted. */
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mem_pieces_sort(mp);
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mem_pieces_coalesce(mp);
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return 1;
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}
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/*
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* Collect information about physical RAM and which pieces are
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* already in use from the device tree.
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*/
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unsigned long __init find_end_of_memory(void)
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{
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unsigned long a, total;
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struct mem_pieces phys_mem;
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/*
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* Find out where physical memory is, and check that it
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* starts at 0 and is contiguous. It seems that RAM is
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* always physically contiguous on Power Macintoshes.
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*
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* Supporting discontiguous physical memory isn't hard,
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* it just makes the virtual <-> physical mapping functions
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* more complicated (or else you end up wasting space
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* in mem_map).
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*/
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memory_node = find_devices("memory");
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if (memory_node == NULL || !get_mem_prop("reg", &phys_mem)
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|| phys_mem.n_regions == 0)
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panic("No RAM??");
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a = phys_mem.regions[0].address;
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if (a != 0)
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panic("RAM doesn't start at physical address 0");
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total = phys_mem.regions[0].size;
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if (phys_mem.n_regions > 1) {
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printk("RAM starting at 0x%x is not contiguous\n",
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phys_mem.regions[1].address);
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printk("Using RAM from 0 to 0x%lx\n", total-1);
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}
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return total;
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}
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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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/* Look for mem= option on command line */
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if (strstr(cmd_line, "mem=")) {
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char *p, *q;
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unsigned long maxmem = 0;
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for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
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q = p + 4;
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if (p > cmd_line && p[-1] != ' ')
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continue;
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maxmem = simple_strtoul(q, &q, 0);
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if (*q == 'k' || *q == 'K') {
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maxmem <<= 10;
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++q;
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} else if (*q == 'm' || *q == 'M') {
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maxmem <<= 20;
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++q;
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}
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}
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__max_memory = maxmem;
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}
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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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/*
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* Figure out how much memory we have, how much
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* is lowmem, and how much is highmem. If we were
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* passed the total memory size from the bootloader,
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* just use it.
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*/
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if (boot_mem_size)
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total_memory = boot_mem_size;
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else
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2005-09-28 06:28:14 -04:00
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total_memory = find_end_of_memory();
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2005-09-26 02:04:21 -04:00
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if (__max_memory && total_memory > __max_memory)
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total_memory = __max_memory;
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total_lowmem = total_memory;
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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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#ifndef CONFIG_HIGHMEM
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total_memory = total_lowmem;
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#endif /* CONFIG_HIGHMEM */
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}
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set_phys_avail(total_lowmem);
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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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#ifdef CONFIG_HIGHMEM
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ioremap_base = PKMAP_BASE;
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#else
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ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
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#endif /* CONFIG_HIGHMEM */
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ioremap_bot = ioremap_base;
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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.setup_io_mappings)
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ppc_md.setup_io_mappings();
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/* Initialize the context management stuff */
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mmu_context_init();
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if (ppc_md.progress)
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ppc_md.progress("MMU:exit", 0x211);
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#ifdef CONFIG_BOOTX_TEXT
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/* By default, we are no longer mapped */
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boot_text_mapped = 0;
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/* Must be done last, or ppc_md.progress will die. */
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map_boot_text();
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#endif
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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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void *p;
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if (init_bootmem_done) {
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p = alloc_bootmem_pages(PAGE_SIZE);
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} else {
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p = mem_pieces_find(PAGE_SIZE, PAGE_SIZE);
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}
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return p;
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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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set_page_count(virt_to_page(start), 1);
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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_BLK_DEV_INITRD
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (start < end)
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printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
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for (; start < end; start += PAGE_SIZE) {
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ClearPageReserved(virt_to_page(start));
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set_page_count(virt_to_page(start), 1);
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free_page(start);
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totalram_pages++;
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}
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}
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#endif
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/*
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* Initialize the bootmem system and give it all the memory we
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* have available.
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*/
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void __init do_init_bootmem(void)
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{
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unsigned long start, size;
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int i;
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/*
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* Find an area to use for the bootmem bitmap.
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* We look for the first area which is at least
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* 128kB in length (128kB is enough for a bitmap
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* for 4GB of memory, using 4kB pages), plus 1 page
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* (in case the address isn't page-aligned).
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*/
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start = 0;
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size = 0;
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for (i = 0; i < phys_avail.n_regions; ++i) {
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unsigned long a = phys_avail.regions[i].address;
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|
|
unsigned long s = phys_avail.regions[i].size;
|
|
|
|
if (s <= size)
|
|
|
|
continue;
|
|
|
|
start = a;
|
|
|
|
size = s;
|
|
|
|
if (s >= 33 * PAGE_SIZE)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
start = PAGE_ALIGN(start);
|
|
|
|
|
|
|
|
min_low_pfn = start >> PAGE_SHIFT;
|
|
|
|
max_low_pfn = (PPC_MEMSTART + total_lowmem) >> PAGE_SHIFT;
|
|
|
|
max_pfn = (PPC_MEMSTART + total_memory) >> PAGE_SHIFT;
|
|
|
|
boot_mapsize = init_bootmem_node(&contig_page_data, min_low_pfn,
|
|
|
|
PPC_MEMSTART >> PAGE_SHIFT,
|
|
|
|
max_low_pfn);
|
|
|
|
|
|
|
|
/* remove the bootmem bitmap from the available memory */
|
|
|
|
mem_pieces_remove(&phys_avail, start, boot_mapsize, 1);
|
|
|
|
|
|
|
|
/* add everything in phys_avail into the bootmem map */
|
|
|
|
for (i = 0; i < phys_avail.n_regions; ++i)
|
|
|
|
free_bootmem(phys_avail.regions[i].address,
|
|
|
|
phys_avail.regions[i].size);
|
|
|
|
|
|
|
|
init_bootmem_done = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* paging_init() sets up the page tables - in fact we've already done this.
|
|
|
|
*/
|
|
|
|
void __init paging_init(void)
|
|
|
|
{
|
|
|
|
unsigned long zones_size[MAX_NR_ZONES], i;
|
|
|
|
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
map_page(PKMAP_BASE, 0, 0); /* XXX gross */
|
|
|
|
pkmap_page_table = pte_offset_kernel(pmd_offset(pgd_offset_k
|
|
|
|
(PKMAP_BASE), PKMAP_BASE), PKMAP_BASE);
|
|
|
|
map_page(KMAP_FIX_BEGIN, 0, 0); /* XXX gross */
|
|
|
|
kmap_pte = pte_offset_kernel(pmd_offset(pgd_offset_k
|
|
|
|
(KMAP_FIX_BEGIN), KMAP_FIX_BEGIN), KMAP_FIX_BEGIN);
|
|
|
|
kmap_prot = PAGE_KERNEL;
|
|
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
|
|
|
|
/*
|
|
|
|
* All pages are DMA-able so we put them all in the DMA zone.
|
|
|
|
*/
|
|
|
|
zones_size[ZONE_DMA] = total_lowmem >> PAGE_SHIFT;
|
|
|
|
for (i = 1; i < MAX_NR_ZONES; i++)
|
|
|
|
zones_size[i] = 0;
|
|
|
|
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
zones_size[ZONE_HIGHMEM] = (total_memory - total_lowmem) >> PAGE_SHIFT;
|
|
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
|
|
|
|
free_area_init(zones_size);
|
|
|
|
}
|
|
|
|
|
|
|
|
void __init mem_init(void)
|
|
|
|
{
|
|
|
|
unsigned long addr;
|
|
|
|
int codepages = 0;
|
|
|
|
int datapages = 0;
|
|
|
|
int initpages = 0;
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
unsigned long highmem_mapnr;
|
|
|
|
|
|
|
|
highmem_mapnr = total_lowmem >> PAGE_SHIFT;
|
|
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
max_mapnr = total_memory >> PAGE_SHIFT;
|
|
|
|
|
|
|
|
high_memory = (void *) __va(PPC_MEMSTART + total_lowmem);
|
|
|
|
num_physpages = max_mapnr; /* RAM is assumed contiguous */
|
|
|
|
|
|
|
|
totalram_pages += free_all_bootmem();
|
|
|
|
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
|
|
/* if we are booted from BootX with an initial ramdisk,
|
|
|
|
make sure the ramdisk pages aren't reserved. */
|
|
|
|
if (initrd_start) {
|
|
|
|
for (addr = initrd_start; addr < initrd_end; addr += PAGE_SIZE)
|
|
|
|
ClearPageReserved(virt_to_page(addr));
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_OF
|
|
|
|
/* mark the RTAS pages as reserved */
|
|
|
|
if ( rtas_data )
|
|
|
|
for (addr = (ulong)__va(rtas_data);
|
|
|
|
addr < PAGE_ALIGN((ulong)__va(rtas_data)+rtas_size) ;
|
|
|
|
addr += PAGE_SIZE)
|
|
|
|
SetPageReserved(virt_to_page(addr));
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_PMAC
|
|
|
|
if (agp_special_page)
|
|
|
|
SetPageReserved(virt_to_page(agp_special_page));
|
|
|
|
#endif
|
|
|
|
for (addr = PAGE_OFFSET; addr < (unsigned long)high_memory;
|
|
|
|
addr += PAGE_SIZE) {
|
|
|
|
if (!PageReserved(virt_to_page(addr)))
|
|
|
|
continue;
|
|
|
|
if (addr < (ulong) etext)
|
|
|
|
codepages++;
|
|
|
|
else if (addr >= (unsigned long)&__init_begin
|
|
|
|
&& addr < (unsigned long)&__init_end)
|
|
|
|
initpages++;
|
|
|
|
else if (addr < (ulong) klimit)
|
|
|
|
datapages++;
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
|
|
{
|
|
|
|
unsigned long pfn;
|
|
|
|
|
|
|
|
for (pfn = highmem_mapnr; pfn < max_mapnr; ++pfn) {
|
|
|
|
struct page *page = mem_map + pfn;
|
|
|
|
|
|
|
|
ClearPageReserved(page);
|
|
|
|
set_page_count(page, 1);
|
|
|
|
__free_page(page);
|
|
|
|
totalhigh_pages++;
|
|
|
|
}
|
|
|
|
totalram_pages += totalhigh_pages;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
|
|
|
|
printk("Memory: %luk available (%dk kernel code, %dk data, %dk init, %ldk highmem)\n",
|
|
|
|
(unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
|
|
|
|
codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
|
|
|
|
initpages<< (PAGE_SHIFT-10),
|
|
|
|
(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
|
|
|
|
|
|
|
|
#ifdef CONFIG_PPC_PMAC
|
|
|
|
if (agp_special_page)
|
|
|
|
printk(KERN_INFO "AGP special page: 0x%08lx\n", agp_special_page);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
mem_init_done = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set phys_avail to the amount of physical memory,
|
|
|
|
* less the kernel text/data/bss.
|
|
|
|
*/
|
|
|
|
void __init
|
|
|
|
set_phys_avail(unsigned long total_memory)
|
|
|
|
{
|
|
|
|
unsigned long kstart, ksize;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initially, available physical memory is equivalent to all
|
|
|
|
* physical memory.
|
|
|
|
*/
|
|
|
|
|
|
|
|
phys_avail.regions[0].address = PPC_MEMSTART;
|
|
|
|
phys_avail.regions[0].size = total_memory;
|
|
|
|
phys_avail.n_regions = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Map out the kernel text/data/bss from the available physical
|
|
|
|
* memory.
|
|
|
|
*/
|
|
|
|
|
|
|
|
kstart = __pa(_stext); /* should be 0 */
|
|
|
|
ksize = PAGE_ALIGN(klimit - _stext);
|
|
|
|
|
|
|
|
mem_pieces_remove(&phys_avail, kstart, ksize, 0);
|
|
|
|
mem_pieces_remove(&phys_avail, 0, 0x4000, 0);
|
|
|
|
|
|
|
|
#if defined(CONFIG_BLK_DEV_INITRD)
|
|
|
|
/* Remove the init RAM disk from the available memory. */
|
|
|
|
if (initrd_start) {
|
|
|
|
mem_pieces_remove(&phys_avail, __pa(initrd_start),
|
|
|
|
initrd_end - initrd_start, 1);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
#ifdef CONFIG_PPC_OF
|
|
|
|
/* remove the RTAS pages from the available memory */
|
|
|
|
if (rtas_data)
|
|
|
|
mem_pieces_remove(&phys_avail, rtas_data, rtas_size, 1);
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_PPC_PMAC
|
|
|
|
/* Because of some uninorth weirdness, we need a page of
|
|
|
|
* memory as high as possible (it must be outside of the
|
|
|
|
* bus address seen as the AGP aperture). It will be used
|
|
|
|
* by the r128 DRM driver
|
|
|
|
*
|
|
|
|
* FIXME: We need to make sure that page doesn't overlap any of the\
|
|
|
|
* above. This could be done by improving mem_pieces_find to be able
|
|
|
|
* to do a backward search from the end of the list.
|
|
|
|
*/
|
|
|
|
if (_machine == _MACH_Pmac && find_devices("uni-north-agp")) {
|
|
|
|
agp_special_page = (total_memory - PAGE_SIZE);
|
|
|
|
mem_pieces_remove(&phys_avail, agp_special_page, PAGE_SIZE, 0);
|
|
|
|
agp_special_page = (unsigned long)__va(agp_special_page);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_PPC_PMAC */
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Mark some memory as reserved by removing it from phys_avail. */
|
|
|
|
void __init reserve_phys_mem(unsigned long start, unsigned long size)
|
|
|
|
{
|
|
|
|
mem_pieces_remove(&phys_avail, start, size, 1);
|
|
|
|
}
|