/*
* 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/proc_fs.h>
#include <asm/pgalloc.h>
#include <asm/page.h>
#include <asm/abs_addr.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/naca.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>
#ifdef CONFIG_PPC_ISERIES
#include <asm/iSeries/iSeries_dma.h>
#endif
struct mmu_context_queue_t mmu_context_queue;
int mem_init_done;
unsigned long ioremap_bot = IMALLOC_BASE;
extern pgd_t swapper_pg_dir[];
extern struct task_struct *current_set[NR_CPUS];
extern pgd_t ioremap_dir[];
pgd_t * ioremap_pgd = (pgd_t *)&ioremap_dir;
static void map_io_page(unsigned long va, unsigned long pa, int flags);
unsigned long klimit = (unsigned long)_end;
HPTE *Hash=0;
unsigned long Hash_size=0;
unsigned long _SDR1=0;
unsigned long _ASR=0;
/* max amount of RAM to use */
unsigned long __max_memory;
/* This is declared as we are using the more or less generic
* include/asm-ppc64/tlb.h file -- tgall
*/
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
void show_mem(void)
{
int total = 0, reserved = 0;
int shared = 0, cached = 0;
struct page *page;
pg_data_t *pgdat;
unsigned long i;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
for_each_pgdat(pgdat) {
for (i = 0; i < pgdat->node_spanned_pages; i++) {
page = pgdat->node_mem_map + i;
total++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (page_count(page))
shared += page_count(page) - 1;
}
}
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);
}
void *
ioremap(unsigned long addr, unsigned long size)
{
#ifdef CONFIG_PPC_ISERIES
return (void*)addr;
#else
void *ret = __ioremap(addr, size, _PAGE_NO_CACHE);
if(mem_init_done)
return eeh_ioremap(addr, ret); /* may remap the addr */
return ret;
#endif
}
extern struct vm_struct * get_im_area( unsigned long size );
void *
__ioremap(unsigned long addr, unsigned long size, unsigned long flags)
{
unsigned long pa, ea, i;
/*
* Choose an address to map it to.
* Once the imalloc system is running, we use it.
* Before that, we map using addresses going
* up from ioremap_bot. imalloc will use
* the addresses from ioremap_bot through
* IMALLOC_END (0xE000001fffffffff)
*
*/
pa = addr & PAGE_MASK;
size = PAGE_ALIGN(addr + size) - pa;
if (size == 0)
return NULL;
if (mem_init_done) {
struct vm_struct *area;
area = get_im_area(size);
if (area == 0)
return NULL;
ea = (unsigned long)(area->addr);
}
else {
ea = ioremap_bot;
ioremap_bot += size;
}
if ((flags & _PAGE_PRESENT) == 0)
flags |= pgprot_val(PAGE_KERNEL);
if (flags & (_PAGE_NO_CACHE | _PAGE_WRITETHRU))
flags |= _PAGE_GUARDED;
for (i = 0; i < size; i += PAGE_SIZE) {
map_io_page(ea+i, pa+i, flags);
}
return (void *) (ea + (addr & ~PAGE_MASK));
}
void iounmap(void *addr)
{
#ifdef CONFIG_PPC_ISERIES
/* iSeries I/O Remap is a noop */
return;
#else
/* DRENG / PPPBBB todo */
return;
#endif
}
/*
* map_io_page currently only called by __ioremap
* map_io_page adds an entry to the ioremap page table
* and adds an entry to the HPT, possibly bolting it
*/
static void map_io_page(unsigned long ea, unsigned long pa, int flags)
{
pgd_t *pgdp;
pmd_t *pmdp;
pte_t *ptep;
unsigned long vsid;
if (mem_init_done) {
spin_lock(&ioremap_mm.page_table_lock);
pgdp = pgd_offset_i(ea);
pmdp = pmd_alloc(&ioremap_mm, pgdp, ea);
ptep = pte_alloc_kernel(&ioremap_mm, pmdp, ea);
pa = absolute_to_phys(pa);
set_pte(ptep, pfn_pte(pa >> PAGE_SHIFT, __pgprot(flags)));
spin_unlock(&ioremap_mm.page_table_lock);
} else {
unsigned long va, vpn, hash, hpteg;
/*
* If the mm subsystem is not fully up, we cannot create a
* linux page table entry for this mapping. Simply bolt an
* entry in the hardware page table.
*/
vsid = get_kernel_vsid(ea);
va = (vsid << 28) | (ea & 0xFFFFFFF);
vpn = va >> PAGE_SHIFT;
hash = hpt_hash(vpn, 0);
hpteg = ((hash & htab_data.htab_hash_mask)*HPTES_PER_GROUP);
/* Panic if a pte grpup is full */
if (ppc_md.hpte_insert(hpteg, va, pa >> PAGE_SHIFT, 0,
_PAGE_NO_CACHE|_PAGE_GUARDED|PP_RWXX,
1, 0) == -1) {
panic("map_io_page: could not insert mapping");
}
}
}
void
flush_tlb_mm(struct mm_struct *mm)
{
struct vm_area_struct *mp;
spin_lock(&mm->page_table_lock);
for (mp = mm->mmap; mp != NULL; mp = mp->vm_next)
__flush_tlb_range(mm, mp->vm_start, mp->vm_end);
/* XXX are there races with checking cpu_vm_mask? - Anton */
cpus_clear(mm->cpu_vm_mask);
spin_unlock(&mm->page_table_lock);
}
/*
* Callers should hold the mm->page_table_lock
*/
void
flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr)
{
unsigned long context = 0;
pgd_t *pgd;
pmd_t *pmd;
pte_t *ptep;
pte_t pte;
int local = 0;
cpumask_t tmp;
switch( REGION_ID(vmaddr) ) {
case VMALLOC_REGION_ID:
pgd = pgd_offset_k( vmaddr );
break;
case IO_REGION_ID:
pgd = pgd_offset_i( vmaddr );
break;
case USER_REGION_ID:
pgd = pgd_offset( vma->vm_mm, vmaddr );
context = vma->vm_mm->context;
/* XXX are there races with checking cpu_vm_mask? - Anton */
tmp = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
local = 1;
break;
default:
panic("flush_tlb_page: invalid region 0x%016lx", vmaddr);
}
if (!pgd_none(*pgd)) {
pmd = pmd_offset(pgd, vmaddr);
if (pmd_present(*pmd)) {
ptep = pte_offset_kernel(pmd, vmaddr);
/* Check if HPTE might exist and flush it if so */
pte = __pte(pte_update(ptep, _PAGE_HPTEFLAGS, 0));
if ( pte_val(pte) & _PAGE_HASHPTE ) {
flush_hash_page(context, vmaddr, pte, local);
}
}
WARN_ON(pmd_hugepage(*pmd));
}
}
struct ppc64_tlb_batch ppc64_tlb_batch[NR_CPUS];
void
__flush_tlb_range(struct mm_struct *mm, unsigned long start, unsigned long end)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *ptep;
pte_t pte;
unsigned long pgd_end, pmd_end;
unsigned long context = 0;
struct ppc64_tlb_batch *batch = &ppc64_tlb_batch[smp_processor_id()];
unsigned long i = 0;
int local = 0;
cpumask_t tmp;
switch(REGION_ID(start)) {
case VMALLOC_REGION_ID:
pgd = pgd_offset_k(start);
break;
case IO_REGION_ID:
pgd = pgd_offset_i(start);
break;
case USER_REGION_ID:
pgd = pgd_offset(mm, start);
context = mm->context;
/* XXX are there races with checking cpu_vm_mask? - Anton */
tmp = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(mm->cpu_vm_mask, tmp))
local = 1;
break;
default:
panic("flush_tlb_range: invalid region for start (%016lx) and end (%016lx)\n", start, end);
}
do {
pgd_end = (start + PGDIR_SIZE) & PGDIR_MASK;
if (pgd_end > end)
pgd_end = end;
if (!pgd_none(*pgd)) {
pmd = pmd_offset(pgd, start);
do {
pmd_end = (start + PMD_SIZE) & PMD_MASK;
if (pmd_end > end)
pmd_end = end;
if (pmd_present(*pmd)) {
ptep = pte_offset_kernel(pmd, start);
do {
if (pte_val(*ptep) & _PAGE_HASHPTE) {
pte = __pte(pte_update(ptep, _PAGE_HPTEFLAGS, 0));
if (pte_val(pte) & _PAGE_HASHPTE) {
batch->pte[i] = pte;
batch->addr[i] = start;
i++;
if (i == PPC64_TLB_BATCH_NR) {
flush_hash_range(context, i, local);
i = 0;
}
}
}
start += PAGE_SIZE;
++ptep;
} while (start < pmd_end);
} else {
WARN_ON(pmd_hugepage(*pmd));
start = pmd_end;
}
++pmd;
} while (start < pgd_end);
} else {
start = pgd_end;
}
++pgd;
} while (start < end);
if (i)
flush_hash_range(context, i, local);
}
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));
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
/*
* Do very early mm setup.
*/
void __init mm_init_ppc64(void)
{
struct paca_struct *lpaca;
unsigned long guard_page, index;
ppc64_boot_msg(0x100, "MM Init");
/* Reserve all contexts < FIRST_USER_CONTEXT for kernel use.
* The range of contexts [FIRST_USER_CONTEXT, NUM_USER_CONTEXT)
* are stored on a stack/queue for easy allocation and deallocation.
*/
mmu_context_queue.lock = SPIN_LOCK_UNLOCKED;
mmu_context_queue.head = 0;
mmu_context_queue.tail = NUM_USER_CONTEXT-1;
mmu_context_queue.size = NUM_USER_CONTEXT;
for(index=0; index < NUM_USER_CONTEXT ;index++) {
mmu_context_queue.elements[index] = index+FIRST_USER_CONTEXT;
}
/* Setup guard pages for the Paca's */
for (index = 0; index < NR_CPUS; index++) {
lpaca = &paca[index];
guard_page = ((unsigned long)lpaca) + 0x1000;
ppc_md.hpte_updateboltedpp(PP_RXRX, guard_page);
}
ppc64_boot_msg(0x100, "MM Init Done");
}
/*
* Initialize the bootmem system and give it all the memory we
* have available.
*/
#ifndef CONFIG_DISCONTIGMEM
void __init do_init_bootmem(void)
{
unsigned long i;
unsigned long start, bootmap_pages;
unsigned long total_pages = lmb_end_of_DRAM() >> PAGE_SHIFT;
int boot_mapsize;
/*
* Find an area to use for the bootmem bitmap. Calculate the size of
* bitmap required as (Total Memory) / PAGE_SIZE / BITS_PER_BYTE.
* Add 1 additional page in case the address isn't page-aligned.
*/
bootmap_pages = bootmem_bootmap_pages(total_pages);
start = (unsigned long)__a2p(lmb_alloc(bootmap_pages<<PAGE_SHIFT, PAGE_SIZE));
if (start == 0) {
udbg_printf("do_init_bootmem: failed to allocate a bitmap.\n");
udbg_printf("\tbootmap_pages = 0x%lx.\n", bootmap_pages);
PPCDBG_ENTER_DEBUGGER();
}
boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
/* add all physical memory to the bootmem map */
for (i=0; i < lmb.memory.cnt; i++) {
unsigned long physbase, size;
unsigned long type = lmb.memory.region[i].type;
if ( type != LMB_MEMORY_AREA )
continue;
physbase = lmb.memory.region[i].physbase;
size = lmb.memory.region[i].size;
free_bootmem(physbase, size);
}
/* reserve the sections we're already using */
for (i=0; i < lmb.reserved.cnt; i++) {
unsigned long physbase = lmb.reserved.region[i].physbase;
unsigned long size = lmb.reserved.region[i].size;
reserve_bootmem(physbase, size);
}
}
/*
* 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;
/*
* All pages are DMA-able so we put them all in the DMA zone.
*/
zones_size[ZONE_DMA] = lmb_end_of_DRAM() >> PAGE_SHIFT;
for (i = 1; i < MAX_NR_ZONES; i++)
zones_size[i] = 0;
free_area_init(zones_size);
}
#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 physbase, size;
unsigned long type = lmb.memory.region[i].type;
struct kcore_list *kcore_mem;
if (type != LMB_MEMORY_AREA)
continue;
physbase = lmb.memory.region[i].physbase;
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(physbase), size);
}
kclist_add(&kcore_vmem, (void *)VMALLOC_START, VMALLOC_END-VMALLOC_START);
return 0;
}
module_init(setup_kcore);
void __init mem_init(void)
{
#ifndef CONFIG_DISCONTIGMEM
extern char *sysmap;
extern unsigned long sysmap_size;
unsigned long addr;
#endif
int codepages = 0;
int datapages = 0;
int initpages = 0;
num_physpages = max_low_pfn; /* RAM is assumed contiguous */
high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
max_pfn = max_low_pfn;
#ifdef CONFIG_DISCONTIGMEM
{
int nid;
for (nid = 0; nid < numnodes; nid++) {
if (node_data[nid].node_spanned_pages != 0) {
printk("freeing bootmem node %x\n", nid);
totalram_pages +=
free_all_bootmem_node(NODE_DATA(nid));
}
}
printk("Memory: %luk available (%dk kernel code, %dk data, %dk init) [%08lx,%08lx]\n",
(unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
initpages<< (PAGE_SHIFT-10),
PAGE_OFFSET, (unsigned long)__va(lmb_end_of_DRAM()));
}
#else
max_mapnr = num_physpages;
totalram_pages += free_all_bootmem();
if ( sysmap_size )
for (addr = (unsigned long)sysmap;
addr < PAGE_ALIGN((unsigned long)sysmap+sysmap_size) ;
addr += PAGE_SIZE)
SetPageReserved(virt_to_page(addr));
for (addr = KERNELBASE; addr <= (unsigned long)__va(lmb_end_of_DRAM());
addr += PAGE_SIZE) {
if (!PageReserved(virt_to_page(addr)))
continue;
if (addr < (unsigned long)_etext)
codepages++;
else if (addr >= (unsigned long)__init_begin
&& addr < (unsigned long)__init_end)
initpages++;
else if (addr < klimit)
datapages++;
}
printk("Memory: %luk available (%dk kernel code, %dk data, %dk init) [%08lx,%08lx]\n",
(unsigned long)nr_free_pages()<< (PAGE_SHIFT-10),
codepages<< (PAGE_SHIFT-10), datapages<< (PAGE_SHIFT-10),
initpages<< (PAGE_SHIFT-10),
PAGE_OFFSET, (unsigned long)__va(lmb_end_of_DRAM()));
#endif
mem_init_done = 1;
#ifdef CONFIG_PPC_ISERIES
create_virtual_bus_tce_table();
#endif
}
/*
* This is called when a page has been modified by the kernel.
* It just marks the page as not i-cache clean. We do the i-cache
* flush later when the page is given to a user process, if necessary.
*/
void flush_dcache_page(struct page *page)
{
/* avoid an atomic op if possible */
if (test_bit(PG_arch_1, &page->flags))
clear_bit(PG_arch_1, &page->flags);
}
void clear_user_page(void *page, unsigned long vaddr, struct page *pg)
{
clear_page(page);
/*
* We shouldnt have to do this, but some versions of glibc
* require it (ld.so assumes zero filled pages are icache clean)
* - Anton
*/
/* avoid an atomic op if possible */
if (test_bit(PG_arch_1, &pg->flags))
clear_bit(PG_arch_1, &pg->flags);
}
void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
struct page *pg)
{
copy_page(vto, vfrom);
/*
* We should be able to use the following optimisation, however
* there are two problems.
* Firstly a bug in some versions of binutils meant PLT sections
* were not marked executable.
* Secondly the first word in the GOT section is blrl, used
* to establish the GOT address. Until recently the GOT was
* not marked executable.
* - Anton
*/
#if 0
if (!vma->vm_file && ((vma->vm_flags & VM_EXEC) == 0))
return;
#endif
/* avoid an atomic op if possible */
if (test_bit(PG_arch_1, &pg->flags))
clear_bit(PG_arch_1, &pg->flags);
}
void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
unsigned long addr, int len)
{
unsigned long maddr;
maddr = (unsigned long)page_address(page) + (addr & ~PAGE_MASK);
flush_icache_range(maddr, maddr + len);
}
extern pte_t *find_linux_pte(pgd_t *pgdir, unsigned long ea);
int __hash_page(unsigned long ea, unsigned long access, unsigned long vsid,
pte_t *ptep, unsigned long trap, int local);
/*
* This is called at the end of handling a user page fault, when the
* fault has been handled by updating a PTE in the linux page tables.
* We use it to preload an HPTE into the hash table corresponding to
* the updated linux PTE.
*
* This must always be called with the mm->page_table_lock held
*/
void update_mmu_cache(struct vm_area_struct *vma, unsigned long ea,
pte_t pte)
{
unsigned long vsid;
void *pgdir;
pte_t *ptep;
int local = 0;
cpumask_t tmp;
/* handle i-cache coherency */
if (!(cur_cpu_spec->cpu_features & CPU_FTR_NOEXECUTE)) {
unsigned long pfn = pte_pfn(pte);
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
if (!PageReserved(page)
&& !test_bit(PG_arch_1, &page->flags)) {
__flush_dcache_icache(page_address(page));
set_bit(PG_arch_1, &page->flags);
}
}
}
/* We only want HPTEs for linux PTEs that have _PAGE_ACCESSED set */
if (!pte_young(pte))
return;
pgdir = vma->vm_mm->pgd;
if (pgdir == NULL)
return;
ptep = find_linux_pte(pgdir, ea);
vsid = get_vsid(vma->vm_mm->context, ea);
tmp = cpumask_of_cpu(smp_processor_id());
if (cpus_equal(vma->vm_mm->cpu_vm_mask, tmp))
local = 1;
__hash_page(ea, pte_val(pte) & (_PAGE_USER|_PAGE_RW), vsid, ptep,
0x300, local);
}
kmem_cache_t *zero_cache;
static void zero_ctor(void *pte, kmem_cache_t *cache, unsigned long flags)
{
memset(pte, 0, PAGE_SIZE);
}
void pgtable_cache_init(void)
{
zero_cache = kmem_cache_create("zero",
PAGE_SIZE,
0,
SLAB_HWCACHE_ALIGN | SLAB_MUST_HWCACHE_ALIGN,
zero_ctor,
NULL);
if (!zero_cache)
panic("pgtable_cache_init(): could not create zero_cache!\n");
}
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