- 根目录:
- arch
- sh
- mm
- init.c
/*
* linux/arch/sh/mm/init.c
*
* Copyright (C) 1999 Niibe Yutaka
* Copyright (C) 2002 - 2011 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/gfp.h>
#include <linux/bootmem.h>
#include <linux/proc_fs.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/io.h>
#include <linux/memblock.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <asm/mmu_context.h>
#include <asm/mmzone.h>
#include <asm/kexec.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/cache.h>
#include <asm/sizes.h>
pgd_t swapper_pg_dir[PTRS_PER_PGD];
void __init generic_mem_init(void)
{
memblock_add(__MEMORY_START, __MEMORY_SIZE);
}
void __init __weak plat_mem_setup(void)
{
/* Nothing to see here, move along. */
}
#ifdef CONFIG_MMU
static pte_t *__get_pte_phys(unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pgd = pgd_offset_k(addr);
if (pgd_none(*pgd)) {
pgd_ERROR(*pgd);
return NULL;
}
pud = pud_alloc(NULL, pgd, addr);
if (unlikely(!pud)) {
pud_ERROR(*pud);
return NULL;
}
pmd = pmd_alloc(NULL, pud, addr);
if (unlikely(!pmd)) {
pmd_ERROR(*pmd);
return NULL;
}
return pte_offset_kernel(pmd, addr);
}
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
pte_t *pte;
pte = __get_pte_phys(addr);
if (!pte_none(*pte)) {
pte_ERROR(*pte);
return;
}
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
local_flush_tlb_one(get_asid(), addr);
if (pgprot_val(prot) & _PAGE_WIRED)
tlb_wire_entry(NULL, addr, *pte);
}
static void clear_pte_phys(unsigned long addr, pgprot_t prot)
{
pte_t *pte;
pte = __get_pte_phys(addr);
if (pgprot_val(prot) & _PAGE_WIRED)
tlb_unwire_entry();
set_pte(pte, pfn_pte(0, __pgprot(0)));
local_flush_tlb_one(get_asid(), addr);
}
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 __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
{
unsigned long address = __fix_to_virt(idx);
if (idx >= __end_of_fixed_addresses) {
BUG();
return;
}
clear_pte_phys(address, prot);
}
static pmd_t * __init one_md_table_init(pud_t *pud)
{
if (pud_none(*pud)) {
pmd_t *pmd;
pmd = alloc_bootmem_pages(PAGE_SIZE);
pud_populate(&init_mm, pud, pmd);
BUG_ON(pmd != pmd_offset(pud, 0));
}
return pmd_offset(pud, 0);
}
static pte_t * __init one_page_table_init(pmd_t *pmd)
{
if (pmd_none(*pmd)) {
pte_t *pte;
pte = alloc_bootmem_pages(PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte);
BUG_ON(pte != pte_offset_kernel(pmd, 0));
}
return pte_offset_kernel(pmd, 0);
}
static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
unsigned long vaddr, pte_t *lastpte)
{
return pte;
}
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;
pte_t *pte = NULL;
int i, j, k;
unsigned long vaddr;
vaddr = start;
i = __pgd_offset(vaddr);
j = __pud_offset(vaddr);
k = __pmd_offset(vaddr);
pgd = pgd_base + i;
for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
pud = (pud_t *)pgd;
for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
pmd = one_md_table_init(pud);
#ifndef __PAGETABLE_PMD_FOLDED
pmd += k;
#endif
for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
pte = page_table_kmap_check(one_page_table_init(pmd),
pmd, vaddr, pte);
vaddr += PMD_SIZE;
}
k = 0;
}
j = 0;
}
}
#endif /* CONFIG_MMU */
void __init allocate_pgdat(unsigned int nid)
{
unsigned long start_pfn, end_pfn;
#ifdef CONFIG_NEED_MULTIPLE_NODES
unsigned long phys;
#endif
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
#ifdef CONFIG_NEED_MULTIPLE_NODES
phys = __memblock_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
/* Retry with all of system memory */
if (!phys)
phys = __memblock_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES, memblock_end_of_DRAM());
if (!phys)
panic("Can't allocate pgdat for node %d\n", nid);
NODE_DATA(nid) = __va(phys);
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
#endif
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}
static void __init bootmem_init_one_node(unsigned int nid)
{
unsigned long total_pages, paddr;
unsigned long end_pfn;
struct pglist_data *p;
p = NODE_DATA(nid);
/* Nothing to do.. */
if (!p->node_spanned_pages)
return;
end_pfn = p->node_start_pfn + p->node_spanned_pages;
total_pages = bootmem_bootmap_pages(p->node_spanned_pages);
paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
if (!paddr)
panic("Can't allocate bootmap for nid[%d]\n", nid);
init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/*
* XXX Handle initial reservations for the system memory node
* only for the moment, we'll refactor this later for handling
* reservations in other nodes.
*/
if (nid == 0) {
struct memblock_region *reg;
/* Reserve the sections we're already using. */
for_each_memblock(reserved, reg) {
reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
}
}
sparse_memory_present_with_active_regions(nid);
}
static void __init do_init_bootmem(void)
{
struct memblock_region *reg;
int i;
/* Add active regions with valid PFNs. */
for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn;
start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_memory_end_pfn(reg);
__add_active_range(0, start_pfn, end_pfn);
}
/* All of system RAM sits in node 0 for the non-NUMA case */
allocate_pgdat(0);
node_set_online(0);
plat_mem_setup();
for_each_online_node(i)
bootmem_init_one_node(i);
sparse_init();
}
static void __init early_reserve_mem(void)
{
unsigned long start_pfn;
u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(_end));
/*
* Reserve the kernel text and Reserve the bootmem bitmap. We do
* this in two steps (first step was init_bootmem()), because
* this catches the (definitely buggy) case of us accidentally
* initializing the bootmem allocator with an invalid RAM area.
*/
memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
/*
* Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
*/
if (CONFIG_ZERO_PAGE_OFFSET != 0)
memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
/*
* Handle additional early reservations
*/
check_for_initrd();
reserve_crashkernel();
}
void __init paging_init(void)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
unsigned long vaddr, end;
int nid;
sh_mv.mv_mem_init();
early_reserve_mem();
/*
* Once the early reservations are out of the way, give the
* platforms a chance to kick out some memory.
*/
if (sh_mv.mv_mem_reserve)
sh_mv.mv_mem_reserve();
memblock_enforce_memory_limit(memory_limit);
memblock_allow_resize();
memblock_dump_all();
/*
* Determine low and high memory ranges:
*/
max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
nodes_clear(node_online_map);
memory_start = (unsigned long)__va(__MEMORY_START);
memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
uncached_init();
pmb_init();
do_init_bootmem();
ioremap_fixed_init();
/* 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().
*/
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
page_table_range_init(vaddr, end, swapper_pg_dir);
kmap_coherent_init();
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_min_pfn;
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);
}
/*
* Early initialization for any I/O MMUs we might have.
*/
static void __init iommu_init(void)
{
no_iommu_init();
}
unsigned int mem_init_done = 0;
void __init mem_init(void)
{
int codesize, datasize, initsize;
int nid;
iommu_init();
num_physpages = 0;
high_memory = NULL;
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
void *node_high_memory;
num_physpages += pgdat->node_present_pages;
if (pgdat->node_spanned_pages)
totalram_pages += free_all_bootmem_node(pgdat);
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;
}
/* Set this up early, so we can take care of the zero page */
cpu_cache_init();
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
__flush_wback_region(empty_zero_page, PAGE_SIZE);
vsyscall_init();
codesize = (unsigned long) &_etext - (unsigned long) &_text;
datasize = (unsigned long) &_edata - (unsigned long) &_etext;
initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk data, %dk init)\n",
nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
datasize >> 10,
initsize >> 10);
printk(KERN_INFO "virtual kernel memory layout:\n"
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
#ifdef CONFIG_HIGHMEM
" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
#endif
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
" lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
#ifdef CONFIG_UNCACHED_MAPPING
" : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
#endif
" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
FIXADDR_START, FIXADDR_TOP,
(FIXADDR_TOP - FIXADDR_START) >> 10,
#ifdef CONFIG_HIGHMEM
PKMAP_BASE, PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
(LAST_PKMAP*PAGE_SIZE) >> 10,
#endif
(unsigned long)VMALLOC_START, VMALLOC_END,
(VMALLOC_END - VMALLOC_START) >> 20,
(unsigned long)memory_start, (unsigned long)high_memory,
((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
#ifdef CONFIG_UNCACHED_MAPPING
uncached_start, uncached_end, uncached_size >> 20,
#endif
(unsigned long)&__init_begin, (unsigned long)&__init_end,
((unsigned long)&__init_end -
(unsigned long)&__init_begin) >> 10,
(unsigned long)&_etext, (unsigned long)&_edata,
((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
(unsigned long)&_text, (unsigned long)&_etext,
((unsigned long)&_etext - (unsigned long)&_text) >> 10);
mem_init_done = 1;
}
void free_initmem(void)
{
free_initmem_default(0);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area(start, end, 0, "initrd");
}
#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(nid, 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
#ifdef CONFIG_MEMORY_HOTREMOVE
int arch_remove_memory(u64 start, u64 size)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long nr_pages = size >> PAGE_SHIFT;
struct zone *zone;
int ret;
zone = page_zone(pfn_to_page(start_pfn));
ret = __remove_pages(zone, start_pfn, nr_pages);
if (unlikely(ret))
pr_warn("%s: Failed, __remove_pages() == %d\n", __func__,
ret);
return ret;
}
#endif
#endif /* CONFIG_MEMORY_HOTPLUG */