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sh: bootmem tidying for discontig/sparsemem preparation.

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This reworks some of the node 0 bootmem initialization in
preparation for discontigmem and sparsemem support.

ARCH_POPULATES_NODE_MAP is switched to as a result of this.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt
2007-03-28 16:38:13 +09:00
committed by Paul Mundt
parent 759ab068c4
commit 01066625e9
5 changed files with 229 additions and 203 deletions
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197
arch/sh/mm/init.c
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@@ -1,37 +1,20 @@
/* $Id: init.c,v 1.19 2004/02/21 04:42:16 kkojima Exp $
*
* linux/arch/sh/mm/init.c
/*
* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002, 2004 Paul Mundt
* Copyright (C) 2002 - 2007 Paul Mundt
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
#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/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/proc_fs.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/cache.h>
@@ -39,37 +22,51 @@
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
#ifdef CONFIG_MMU
/* It'd be good if these lines were in the standard header file. */
#define START_PFN (NODE_DATA(0)->bdata->node_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN (NODE_DATA(0)->bdata->node_low_pfn)
#endif
void (*copy_page)(void *from, void *to);
void (*clear_page)(void *to);
void show_mem(void)
{
int i, total = 0, reserved = 0;
int shared = 0, cached = 0;
int total = 0, reserved = 0, free = 0;
int shared = 0, cached = 0, slab = 0;
pg_data_t *pgdat;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
i = max_mapnr;
while (i-- > 0) {
total++;
if (PageReserved(mem_map+i))
reserved++;
else if (PageSwapCache(mem_map+i))
cached++;
else if (page_count(mem_map+i))
shared += page_count(mem_map+i) - 1;
for_each_online_pgdat(pgdat) {
struct page *page, *end;
unsigned long flags;
pgdat_resize_lock(pgdat, &flags);
page = pgdat->node_mem_map;
end = page + pgdat->node_spanned_pages;
do {
total++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (PageSlab(page))
slab++;
else if (!page_count(page))
free++;
else
shared += page_count(page) - 1;
page++;
} while (page < end);
pgdat_resize_unlock(pgdat, &flags);
}
printk("%d pages of RAM\n",total);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
printk("%d pages of RAM\n", total);
printk("%d free pages\n", free);
printk("%d reserved pages\n", reserved);
printk("%d slab pages\n", slab);
printk("%d pages shared\n", shared);
printk("%d pages swap cached\n", cached);
}
#ifdef CONFIG_MMU
@@ -147,52 +144,38 @@ extern char __init_begin, __init_end;
*/
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
int nid;
/*
* Setup some defaults for the zone sizes.. these should be safe
* regardless of distcontiguous memory or MMU settings.
*/
zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
#ifdef CONFIG_HIGHMEM
zones_size[ZONE_HIGHMEM] = 0 >> PAGE_SHIFT;
#endif
#ifdef CONFIG_MMU
/*
* If we have an MMU, and want to be using it .. we need to adjust
* the zone sizes accordingly, in addition to turning it on.
*/
{
/* We don't need to map the kernel through the TLB, as
* it is permanatly mapped using P1. So clear the
* entire pgd. */
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Turn on the MMU */
enable_mmu();
zones_size[ZONE_NORMAL] = MAX_LOW_PFN - START_PFN;
}
/* We don't need to map the kernel through the TLB, as
* it is permanatly mapped using P1. So clear the
* entire pgd. */
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
/* Set an initial value for the MMU.TTB so we don't have to
* check for a null value. */
set_TTB(swapper_pg_dir);
#elif defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH4)
/*
* If we don't have CONFIG_MMU set and the processor in question
* still has an MMU, care needs to be taken to make sure it doesn't
* stay on.. Since the boot loader could have potentially already
* turned it on, and we clearly don't want it, we simply turn it off.
*
* We don't need to do anything special for the zone sizes, since the
* default values that were already configured up above should be
* satisfactory.
*/
disable_mmu();
#endif
NODE_DATA(0)->node_mem_map = NULL;
free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long max_zone_pfns[MAX_NR_ZONES];
unsigned long low, start_pfn;
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
low = pgdat->bdata->node_low_pfn;
max_zone_pfns[ZONE_NORMAL] = low;
add_active_range(nid, start_pfn, low);
printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
nid, start_pfn, low);
free_area_init_nodes(max_zone_pfns);
printk("Node %u: mem_map starts at %p\n",
pgdat->node_id, pgdat->node_mem_map);
}
}
static struct kcore_list kcore_mem, kcore_vmalloc;
@@ -200,18 +183,33 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
int tmp;
extern unsigned long memory_start;
int nid;
#ifdef CONFIG_MMU
high_memory = (void *)__va(MAX_LOW_PFN * PAGE_SIZE);
#else
extern unsigned long memory_end;
reservedpages = 0;
high_memory = (void *)(memory_end & PAGE_MASK);
#endif
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long node_pages = 0;
void *node_high_memory;
int i;
max_mapnr = num_physpages = MAP_NR(high_memory) - MAP_NR(memory_start);
num_physpages += pgdat->node_present_pages;
if (pgdat->node_spanned_pages)
node_pages = free_all_bootmem_node(pgdat);
totalram_pages += node_pages;
for (i = 0; i < node_pages; i++)
if (PageReserved(pgdat->node_mem_map + i))
reservedpages++;
node_high_memory = (void *)((pgdat->node_start_pfn +
pgdat->node_spanned_pages) <<
PAGE_SHIFT);
if (node_high_memory > high_memory)
high_memory = node_high_memory;
}
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
@@ -229,16 +227,6 @@ void __init mem_init(void)
clear_page = clear_page_nommu;
#endif
/* this will put all low memory onto the freelists */
totalram_pages += free_all_bootmem_node(NODE_DATA(0));
reservedpages = 0;
for (tmp = 0; tmp < num_physpages; tmp++)
/*
* Only count reserved RAM pages
*/
if (PageReserved(mem_map+tmp))
reservedpages++;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
@@ -250,7 +238,7 @@ void __init mem_init(void)
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
max_mapnr << (PAGE_SHIFT-10),
totalram_pages << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
@@ -289,4 +277,3 @@ void free_initrd_mem(unsigned long start, unsigned long end)
printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif