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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;
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