You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
223 lines
6.0 KiB
223 lines
6.0 KiB
/*
|
|
* 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
|
|
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
|
|
*
|
|
* Derived from "arch/i386/mm/init.c"
|
|
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
|
|
*
|
|
* Dave Engebretsen <engebret@us.ibm.com>
|
|
* Rework for PPC64 port.
|
|
*
|
|
* 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/config.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/mman.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/init.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/idr.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/lmb.h>
|
|
#include <asm/rtas.h>
|
|
#include <asm/io.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/eeh.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mmzone.h>
|
|
#include <asm/cputable.h>
|
|
#include <asm/ppcdebug.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/system.h>
|
|
#include <asm/iommu.h>
|
|
#include <asm/abs_addr.h>
|
|
#include <asm/vdso.h>
|
|
#include <asm/imalloc.h>
|
|
|
|
#if PGTABLE_RANGE > USER_VSID_RANGE
|
|
#warning Limited user VSID range means pagetable space is wasted
|
|
#endif
|
|
|
|
#if (TASK_SIZE_USER64 < PGTABLE_RANGE) && (TASK_SIZE_USER64 < USER_VSID_RANGE)
|
|
#warning TASK_SIZE is smaller than it needs to be.
|
|
#endif
|
|
|
|
unsigned long klimit = (unsigned long)_end;
|
|
|
|
/* max amount of RAM to use */
|
|
unsigned long __max_memory;
|
|
|
|
/* info on what we think the IO hole is */
|
|
unsigned long io_hole_start;
|
|
unsigned long io_hole_size;
|
|
|
|
/*
|
|
* Do very early mm setup.
|
|
*/
|
|
void __init mm_init_ppc64(void)
|
|
{
|
|
#ifndef CONFIG_PPC_ISERIES
|
|
unsigned long i;
|
|
#endif
|
|
|
|
ppc64_boot_msg(0x100, "MM Init");
|
|
|
|
/* This is the story of the IO hole... please, keep seated,
|
|
* unfortunately, we are out of oxygen masks at the moment.
|
|
* So we need some rough way to tell where your big IO hole
|
|
* is. On pmac, it's between 2G and 4G, on POWER3, it's around
|
|
* that area as well, on POWER4 we don't have one, etc...
|
|
* We need that as a "hint" when sizing the TCE table on POWER3
|
|
* So far, the simplest way that seem work well enough for us it
|
|
* to just assume that the first discontinuity in our physical
|
|
* RAM layout is the IO hole. That may not be correct in the future
|
|
* (and isn't on iSeries but then we don't care ;)
|
|
*/
|
|
|
|
#ifndef CONFIG_PPC_ISERIES
|
|
for (i = 1; i < lmb.memory.cnt; i++) {
|
|
unsigned long base, prevbase, prevsize;
|
|
|
|
prevbase = lmb.memory.region[i-1].base;
|
|
prevsize = lmb.memory.region[i-1].size;
|
|
base = lmb.memory.region[i].base;
|
|
if (base > (prevbase + prevsize)) {
|
|
io_hole_start = prevbase + prevsize;
|
|
io_hole_size = base - (prevbase + prevsize);
|
|
break;
|
|
}
|
|
}
|
|
#endif /* CONFIG_PPC_ISERIES */
|
|
if (io_hole_start)
|
|
printk("IO Hole assumed to be %lx -> %lx\n",
|
|
io_hole_start, io_hole_start + io_hole_size - 1);
|
|
|
|
ppc64_boot_msg(0x100, "MM Init Done");
|
|
}
|
|
|
|
void free_initmem(void)
|
|
{
|
|
unsigned long addr;
|
|
|
|
addr = (unsigned long)__init_begin;
|
|
for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
|
|
memset((void *)addr, 0xcc, PAGE_SIZE);
|
|
ClearPageReserved(virt_to_page(addr));
|
|
set_page_count(virt_to_page(addr), 1);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk ("Freeing unused kernel memory: %luk freed\n",
|
|
((unsigned long)__init_end - (unsigned long)__init_begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
if (start < end)
|
|
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
set_page_count(virt_to_page(start), 1);
|
|
free_page(start);
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static struct kcore_list kcore_vmem;
|
|
|
|
static int __init setup_kcore(void)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < lmb.memory.cnt; i++) {
|
|
unsigned long base, size;
|
|
struct kcore_list *kcore_mem;
|
|
|
|
base = lmb.memory.region[i].base;
|
|
size = lmb.memory.region[i].size;
|
|
|
|
/* GFP_ATOMIC to avoid might_sleep warnings during boot */
|
|
kcore_mem = kmalloc(sizeof(struct kcore_list), GFP_ATOMIC);
|
|
if (!kcore_mem)
|
|
panic("mem_init: kmalloc failed\n");
|
|
|
|
kclist_add(kcore_mem, __va(base), size);
|
|
}
|
|
|
|
kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
|
|
|
|
return 0;
|
|
}
|
|
module_init(setup_kcore);
|
|
|
|
static void zero_ctor(void *addr, kmem_cache_t *cache, unsigned long flags)
|
|
{
|
|
memset(addr, 0, kmem_cache_size(cache));
|
|
}
|
|
|
|
static const int pgtable_cache_size[2] = {
|
|
PTE_TABLE_SIZE, PMD_TABLE_SIZE
|
|
};
|
|
static const char *pgtable_cache_name[ARRAY_SIZE(pgtable_cache_size)] = {
|
|
"pgd_pte_cache", "pud_pmd_cache",
|
|
};
|
|
|
|
kmem_cache_t *pgtable_cache[ARRAY_SIZE(pgtable_cache_size)];
|
|
|
|
void pgtable_cache_init(void)
|
|
{
|
|
int i;
|
|
|
|
BUILD_BUG_ON(PTE_TABLE_SIZE != pgtable_cache_size[PTE_CACHE_NUM]);
|
|
BUILD_BUG_ON(PMD_TABLE_SIZE != pgtable_cache_size[PMD_CACHE_NUM]);
|
|
BUILD_BUG_ON(PUD_TABLE_SIZE != pgtable_cache_size[PUD_CACHE_NUM]);
|
|
BUILD_BUG_ON(PGD_TABLE_SIZE != pgtable_cache_size[PGD_CACHE_NUM]);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pgtable_cache_size); i++) {
|
|
int size = pgtable_cache_size[i];
|
|
const char *name = pgtable_cache_name[i];
|
|
|
|
pgtable_cache[i] = kmem_cache_create(name,
|
|
size, size,
|
|
SLAB_HWCACHE_ALIGN
|
|
| SLAB_MUST_HWCACHE_ALIGN,
|
|
zero_ctor,
|
|
NULL);
|
|
if (! pgtable_cache[i])
|
|
panic("pgtable_cache_init(): could not create %s!\n",
|
|
name);
|
|
}
|
|
}
|
|
|