You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
91 lines
2.1 KiB
91 lines
2.1 KiB
20 years ago
|
#include <linux/vmalloc.h>
|
||
|
|
#include <asm/pgalloc.h>
|
||
|
|
#include <asm/cacheflush.h>
|
||
|
|
|
||
|
|
/* called with the page_table_lock held */
|
||
|
|
static inline void
|
||
|
|
remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
|
||
|
|
unsigned long phys_addr, unsigned long flags)
|
||
|
|
{
|
||
|
|
unsigned long end;
|
||
|
|
unsigned long pfn;
|
||
|
|
|
||
|
|
address &= ~PMD_MASK;
|
||
|
|
end = address + size;
|
||
|
|
if (end > PMD_SIZE)
|
||
|
|
end = PMD_SIZE;
|
||
|
|
if (address >= end)
|
||
|
|
BUG();
|
||
|
|
pfn = phys_addr >> PAGE_SHIFT;
|
||
|
|
do {
|
||
|
|
if (!pte_none(*pte)) {
|
||
|
|
printk("remap_area_pte: page already exists\n");
|
||
|
|
BUG();
|
||
|
|
}
|
||
|
|
set_pte(pte, pfn_pte(pfn,
|
||
|
|
__pgprot(_PAGE_VALID | _PAGE_ASM |
|
||
|
|
_PAGE_KRE | _PAGE_KWE | flags)));
|
||
|
|
address += PAGE_SIZE;
|
||
|
|
pfn++;
|
||
|
|
pte++;
|
||
|
|
} while (address && (address < end));
|
||
|
|
}
|
||
|
|
|
||
|
|
/* called with the page_table_lock held */
|
||
|
|
static inline int
|
||
|
|
remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
|
||
|
|
unsigned long phys_addr, unsigned long flags)
|
||
|
|
{
|
||
|
|
unsigned long end;
|
||
|
|
|
||
|
|
address &= ~PGDIR_MASK;
|
||
|
|
end = address + size;
|
||
|
|
if (end > PGDIR_SIZE)
|
||
|
|
end = PGDIR_SIZE;
|
||
|
|
phys_addr -= address;
|
||
|
|
if (address >= end)
|
||
|
|
BUG();
|
||
|
|
do {
|
||
|
|
pte_t * pte = pte_alloc_kernel(&init_mm, pmd, address);
|
||
|
|
if (!pte)
|
||
|
|
return -ENOMEM;
|
||
|
|
remap_area_pte(pte, address, end - address,
|
||
|
|
address + phys_addr, flags);
|
||
|
|
address = (address + PMD_SIZE) & PMD_MASK;
|
||
|
|
pmd++;
|
||
|
|
} while (address && (address < end));
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int
|
||
|
|
__alpha_remap_area_pages(unsigned long address, unsigned long phys_addr,
|
||
|
|
unsigned long size, unsigned long flags)
|
||
|
|
{
|
||
|
|
pgd_t * dir;
|
||
|
|
int error = 0;
|
||
|
|
unsigned long end = address + size;
|
||
|
|
|
||
|
|
phys_addr -= address;
|
||
|
|
dir = pgd_offset(&init_mm, address);
|
||
|
|
flush_cache_all();
|
||
|
|
if (address >= end)
|
||
|
|
BUG();
|
||
|
|
spin_lock(&init_mm.page_table_lock);
|
||
|
|
do {
|
||
|
|
pmd_t *pmd;
|
||
|
|
pmd = pmd_alloc(&init_mm, dir, address);
|
||
|
|
error = -ENOMEM;
|
||
|
|
if (!pmd)
|
||
|
|
break;
|
||
|
|
if (remap_area_pmd(pmd, address, end - address,
|
||
|
|
phys_addr + address, flags))
|
||
|
|
break;
|
||
|
|
error = 0;
|
||
|
|
address = (address + PGDIR_SIZE) & PGDIR_MASK;
|
||
|
|
dir++;
|
||
|
|
} while (address && (address < end));
|
||
|
|
spin_unlock(&init_mm.page_table_lock);
|
||
|
|
return error;
|
||
|
|
}
|
||
|
|
|