/*
* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2007 Paul Mundt
*
* Based on linux/arch/i386/mm/init.c:
* Copyright (C) 1995 Linus Torvalds
*/
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <asm/mmu_context.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/sections.h>
#include <asm/cache.h>
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
pgd_t swapper_pg_dir[PTRS_PER_PGD];
unsigned long cached_to_uncached = 0;
void show_mem(void)
{
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();
for_each_online_pgdat(pgdat) {
unsigned long flags, i;
pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; i++) {
struct page *page = pgdat_page_nr(pgdat, i);
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;
}
pgdat_resize_unlock(pgdat, &flags);
}
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);
printk(KERN_INFO "Total of %ld pages in page table cache\n",
quicklist_total_size());
}
#ifdef CONFIG_MMU
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset_k(addr);
if (pgd_none(*pgd)) {
pgd_ERROR(*pgd);
return;
}
pud = pud_alloc(NULL, pgd, addr);
if (unlikely(!pud)) {
pud_ERROR(*pud);
return;
}
pmd = pmd_alloc(NULL, pud, addr);
if (unlikely(!pmd)) {
pmd_ERROR(*pmd);
return;
}
pte = pte_offset_kernel(pmd, addr);
if (!pte_none(*pte)) {
pte_ERROR(*pte);
return;
}
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
if (cached_to_uncached)
flush_tlb_one(get_asid(), addr);
}
/*
* As a performance optimization, other platforms preserve the fixmap mapping
* across a context switch, we don't presently do this, but this could be done
* in a similar fashion as to the wired TLB interface that sh64 uses (by way
* of the memory mapped UTLB configuration) -- this unfortunately forces us to
* give up a TLB entry for each mapping we want to preserve. While this may be
* viable for a small number of fixmaps, it's not particularly useful for
* everything and needs to be carefully evaluated. (ie, we may want this for
* the vsyscall page).
*
* XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
* in at __set_fixmap() time to determine the appropriate behavior to follow.
*
* -- PFM.
*/
void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
{
unsigned long address = __fix_to_virt(idx);
if (idx >= __end_of_fixed_addresses) {
BUG();
return;
}
set_pte_phys(address, phys, prot);
}
void __init page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
int pgd_idx;
unsigned long vaddr;
vaddr = start & PMD_MASK;
end = (end + PMD_SIZE - 1) & PMD_MASK;
pgd_idx = pgd_index(vaddr);
pgd = pgd_base + pgd_idx;
for ( ; (pgd_idx < PTRS_PER_PGD) && (vaddr != end); pgd++, pgd_idx++) {
BUG_ON(pgd_none(*pgd));
pud = pud_offset(pgd, 0);
BUG_ON(pud_none(*pud));
pmd = pmd_offset(pud, 0);
if (!pmd_present(*pmd)) {
pte_t *pte_table;
pte_table = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
memset(pte_table, 0, PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte_table);
}
vaddr += PMD_SIZE;
}
}
#endif /* CONFIG_MMU */
/*
* paging_init() sets up the page tables
*/
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
int nid;
/* 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);
/* Populate the relevant portions of swapper_pg_dir so that
* we can use the fixmap entries without calling kmalloc.
* pte's will be filled in by __set_fixmap(). */
page_table_range_init(FIXADDR_START, FIXADDR_TOP, swapper_pg_dir);
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long low, start_pfn;
start_pfn = pgdat->bdata->node_boot_start >> PAGE_SHIFT;
low = pgdat->bdata->node_low_pfn;
if (max_zone_pfns[ZONE_NORMAL] < low)
max_zone_pfns[ZONE_NORMAL] = low;
printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
nid, start_pfn, low);
}
free_area_init_nodes(max_zone_pfns);
#ifdef CONFIG_SUPERH32
/* Set up the uncached fixmap */
set_fixmap_nocache(FIX_UNCACHED, __pa(&__uncached_start));
#ifdef CONFIG_29BIT
/*
* Handle trivial transitions between cached and uncached
* segments, making use of the 1:1 mapping relationship in
* 512MB lowmem.
*/
cached_to_uncached = P2SEG - P1SEG;
#endif
#endif
}
static struct kcore_list kcore_mem, kcore_vmalloc;
int after_bootmem = 0;
void __init mem_init(void)
{
int codesize, datasize, initsize;
int nid;
num_physpages = 0;
high_memory = NULL;
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long node_pages = 0;
void *node_high_memory;
num_physpages += pgdat->node_present_pages;
if (pgdat->node_spanned_pages)
node_pages = free_all_bootmem_node(pgdat);
totalram_pages += node_pages;
node_high_memory = (void *)__va((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);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
after_bootmem = 1;
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
VMALLOC_END - VMALLOC_START);
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
datasize >> 10,
initsize >> 10);
p3_cache_init();
/* Initialize the vDSO */
vsyscall_init();
}
void free_initmem(void)
{
unsigned long addr;
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
printk("Freeing unused kernel memory: %ldk 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)
{
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}
printk("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
#ifdef CONFIG_MEMORY_HOTPLUG
int arch_add_memory(int nid, u64 start, u64 size)
{
pg_data_t *pgdat;
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
int ret;
pgdat = NODE_DATA(nid);
/* We only have ZONE_NORMAL, so this is easy.. */
ret = __add_pages(pgdat->node_zones + ZONE_NORMAL, start_pfn, nr_pages);
if (unlikely(ret))
printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
return ret;
}
EXPORT_SYMBOL_GPL(arch_add_memory);
#ifdef CONFIG_NUMA
int memory_add_physaddr_to_nid(u64 addr)
{
/* Node 0 for now.. */
return 0;
}
EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
#endif
#endif
