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/*
* Xen memory allocator routines
*
* Copyright (C) 2005 Hewlett-Packard Co
* Dan Magenheimer <dan.magenheimer@hp.com>
* Copyright (C) 2005 Intel Corp.
*
* Routines used by ia64 machines with contiguous (or virtually contiguous)
* memory.
*/
#include <linux/config.h>
#include <asm/pgtable.h>
#include <xen/mm.h>
#ifdef CONFIG_VIRTUAL_FRAME_TABLE
#include <linux/efi.h>
#include <asm/pgalloc.h>
extern unsigned long frametable_pg_dir[];
#define FRAMETABLE_PGD_OFFSET(ADDR) \
(frametable_pg_dir + (((ADDR) >> PGDIR_SHIFT) & \
((1UL << (PAGE_SHIFT - 3)) - 1)))
#define FRAMETABLE_PMD_OFFSET(PGD, ADDR) \
__va((unsigned long *)(PGD) + (((ADDR) >> PMD_SHIFT) & \
((1UL << (PAGE_SHIFT - 3)) - 1)))
#define FRAMETABLE_PTE_OFFSET(PMD, ADDR) \
(pte_t *)__va((unsigned long *)(PMD) + (((ADDR) >> PAGE_SHIFT) & \
((1UL << (PAGE_SHIFT - 3)) - 1)))
static unsigned long table_size;
static int opt_contig_mem = 0;
boolean_param("contig_mem", opt_contig_mem);
#else
#define opt_contig_mem 1
#endif
struct page_info *frame_table __read_mostly;
unsigned long max_page;
/*
* Set up the page tables.
*/
volatile unsigned long *mpt_table __read_mostly;
void __init
paging_init (void)
{
unsigned int mpt_order;
unsigned long mpt_table_size;
unsigned long i;
if (!opt_contig_mem) {
/* mpt_table is already allocated at this point. */
return;
}
/* Create machine to physical mapping table
* NOTE: similar to frame table, later we may need virtually
* mapped mpt table if large hole exists. Also MAX_ORDER needs
* to be changed in common code, which only support 16M by far
*/
mpt_table_size = max_page * sizeof(unsigned long);
mpt_order = get_order(mpt_table_size);
ASSERT(mpt_order <= MAX_ORDER);
if ((mpt_table = alloc_xenheap_pages(mpt_order)) == NULL)
panic("Not enough memory to bootstrap Xen.\n");
printk("machine to physical table: 0x%lx mpt_table_size 0x%lx\n"
"mpt_order %u max_page 0x%lx\n",
(u64)mpt_table, mpt_table_size, mpt_order, max_page);
for (i = 0;
i < ((1UL << mpt_order) << PAGE_SHIFT) / sizeof(mpt_table[0]);
i++) {
mpt_table[i] = INVALID_M2P_ENTRY;
}
}
#ifdef CONFIG_VIRTUAL_FRAME_TABLE
static unsigned long __init
alloc_dir_page(void)
{
unsigned long mfn = alloc_boot_pages(1, 1);
unsigned long dir;
if (!mfn)
panic("Not enough memory for virtual frame table!\n");
++table_size;
dir = mfn << PAGE_SHIFT;
clear_page(__va(dir));
return dir;
}
static inline unsigned long __init
alloc_table_page(unsigned long fill)
{
unsigned long mfn = alloc_boot_pages(1, 1);
unsigned long *table;
unsigned long i;
if (!mfn)
panic("Not enough memory for virtual frame table!\n");
++table_size;
table = (unsigned long *)__va((mfn << PAGE_SHIFT));
for (i = 0; i < PAGE_SIZE / sizeof(unsigned long); i++)
table[i] = fill;
return mfn;
}
static void __init
create_page_table(unsigned long start_page, unsigned long end_page,
unsigned long fill)
{
unsigned long address;
unsigned long *dir;
pte_t *pteptr;
for (address = start_page; address < end_page; address += PAGE_SIZE) {
dir = FRAMETABLE_PGD_OFFSET(address);
if (!*dir)
*dir = alloc_dir_page();
dir = FRAMETABLE_PMD_OFFSET(*dir, address);
if (!*dir)
*dir = alloc_dir_page();
pteptr = FRAMETABLE_PTE_OFFSET(*dir, address);
if (pte_none(*pteptr))
set_pte(pteptr, pfn_pte(alloc_table_page(fill),
PAGE_KERNEL));
}
}
static int __init
create_frametable_page_table (u64 start, u64 end, void *arg)
{
struct page_info *map_start, *map_end;
unsigned long start_page, end_page;
map_start = frame_table + (__pa(start) >> PAGE_SHIFT);
map_end = frame_table + (__pa(end) >> PAGE_SHIFT);
start_page = (unsigned long) map_start & PAGE_MASK;
end_page = PAGE_ALIGN((unsigned long) map_end);
create_page_table(start_page, end_page, 0L);
return 0;
}
static int __init
create_mpttable_page_table (u64 start, u64 end, void *arg)
{
unsigned long map_start, map_end;
unsigned long start_page, end_page;
map_start = (unsigned long)(mpt_table + (__pa(start) >> PAGE_SHIFT));
map_end = (unsigned long)(mpt_table + (__pa(end) >> PAGE_SHIFT));
start_page = map_start & PAGE_MASK;
end_page = PAGE_ALIGN(map_end);
create_page_table(start_page, end_page, INVALID_M2P_ENTRY);
return 0;
}
void __init init_virtual_frametable(void)
{
/* Allocate virtual frame_table */
frame_table = (struct page_info *) VIRT_FRAME_TABLE_ADDR;
table_size = 0;
efi_memmap_walk(create_frametable_page_table, NULL);
printk("size of virtual frame_table: %lukB\n",
((table_size << PAGE_SHIFT) >> 10));
/* Allocate virtual mpt_table */
table_size = 0;
mpt_table = (unsigned long *)VIRT_FRAME_TABLE_END - max_page;
efi_memmap_walk(create_mpttable_page_table, NULL);
printk("virtual machine to physical table: %p size: %lukB\n"
"max_page: 0x%lx\n",
mpt_table, ((table_size << PAGE_SHIFT) >> 10), max_page);
/*
* XXX work around for translate_domain_pte().
* It returns mfn=0 when the machine page isn't present. This
* behavior is a work around for memory mapped I/O where no device
* is assigned. Xen might access page_info of mfn=0, so it must
* be guaranteed that it exists. Otherwise xen panics with tlb miss
* fault in xen's virtual address area.
*
* Once translate_domain_pte() is fixed correctly, this will
* be removed.
*/
if (!mfn_valid(0)) {
printk("allocating frame table/mpt table at mfn 0.\n");
create_frametable_page_table(0, PAGE_SIZE, NULL);
create_mpttable_page_table(0, PAGE_SIZE, NULL);
}
}
int
ia64_mfn_valid (unsigned long pfn)
{
extern long ia64_frametable_probe(unsigned long);
struct page_info *pg;
int valid;
if (opt_contig_mem)
return 1;
pg = mfn_to_page(pfn);
valid = ia64_frametable_probe((unsigned long)pg);
/* more check the whole struct of page_info */
if (valid)
valid = ia64_frametable_probe((unsigned long)(pg+1)-1);
return valid;
}
EXPORT_SYMBOL(ia64_mfn_valid);
#endif /* CONFIG_VIRTUAL_FRAME_TABLE */
/* FIXME: postpone support to machines with big holes between physical memorys.
* Current hack allows only efi memdesc upto 4G place. (See efi.c)
*/
#define FT_ALIGN_SIZE (16UL << 20)
void __init init_frametable(void)
{
unsigned long pfn;
unsigned long frame_table_size;
#ifdef CONFIG_VIRTUAL_FRAME_TABLE
if (!opt_contig_mem) {
init_virtual_frametable();
return;
}
#endif
frame_table_size = max_page * sizeof(struct page_info);
frame_table_size = (frame_table_size + PAGE_SIZE - 1) & PAGE_MASK;
/* Request continuous trunk from boot allocator, since HV
* address is identity mapped */
pfn = alloc_boot_pages(
frame_table_size >> PAGE_SHIFT, FT_ALIGN_SIZE >> PAGE_SHIFT);
if (pfn == 0)
panic("Not enough memory for frame table.\n");
frame_table = __va(pfn << PAGE_SHIFT);
memset(frame_table, 0, frame_table_size);
printk("size of frame_table: %lukB\n",
frame_table_size >> 10);
}
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