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/* $Id: generic.c,v 1.18 2001/12/21 04:56:15 davem Exp $
* generic.c: Generic Sparc mm routines that are not dependent upon
* MMU type but are Sparc specific.
*
* Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/tlbflush.h>
/* Remap IO memory, the same way as remap_pfn_range(), but use
* the obio memory space.
*
* They use a pgprot that sets PAGE_IO and does not check the
* mem_map table as this is independent of normal memory.
*/
static inline void io_remap_pte_range(struct mm_struct *mm, pte_t * pte,
unsigned long address,
unsigned long size,
unsigned long offset, pgprot_t prot,
int space)
{
unsigned long end;
/* clear hack bit that was used as a write_combine side-effect flag */
offset &= ~0x1UL;
address &= ~PMD_MASK;
end = address + size;
if (end > PMD_SIZE)
end = PMD_SIZE;
do {
pte_t entry;
unsigned long curend = address + PAGE_SIZE;
entry = mk_pte_io(offset, prot, space);
if (!(address & 0xffff)) {
if (!(address & 0x3fffff) && !(offset & 0x3ffffe) && end >= address + 0x400000) {
entry = mk_pte_io(offset,
__pgprot(pgprot_val (prot) | _PAGE_SZ4MB),
space);
curend = address + 0x400000;
offset += 0x400000;
} else if (!(address & 0x7ffff) && !(offset & 0x7fffe) && end >= address + 0x80000) {
entry = mk_pte_io(offset,
__pgprot(pgprot_val (prot) | _PAGE_SZ512K),
space);
curend = address + 0x80000;
offset += 0x80000;
} else if (!(offset & 0xfffe) && end >= address + 0x10000) {
entry = mk_pte_io(offset,
__pgprot(pgprot_val (prot) | _PAGE_SZ64K),
space);
curend = address + 0x10000;
offset += 0x10000;
} else
offset += PAGE_SIZE;
} else
offset += PAGE_SIZE;
do {
BUG_ON(!pte_none(*pte));
set_pte_at(mm, address, pte, entry);
address += PAGE_SIZE;
pte++;
} while (address < curend);
} while (address < end);
}
static inline int io_remap_pmd_range(struct mm_struct *mm, pmd_t * pmd, unsigned long address, unsigned long size,
unsigned long offset, pgprot_t prot, int space)
{
unsigned long end;
address &= ~PGDIR_MASK;
end = address + size;
if (end > PGDIR_SIZE)
end = PGDIR_SIZE;
offset -= address;
do {
pte_t * pte = pte_alloc_map(mm, pmd, address);
if (!pte)
return -ENOMEM;
io_remap_pte_range(mm, pte, address, end - address, address + offset, prot, space);
pte_unmap(pte);
address = (address + PMD_SIZE) & PMD_MASK;
pmd++;
} while (address < end);
return 0;
}
static inline int io_remap_pud_range(struct mm_struct *mm, pud_t * pud, unsigned long address, unsigned long size,
unsigned long offset, pgprot_t prot, int space)
{
unsigned long end;
address &= ~PUD_MASK;
end = address + size;
if (end > PUD_SIZE)
end = PUD_SIZE;
offset -= address;
do {
pmd_t *pmd = pmd_alloc(mm, pud, address);
if (!pud)
return -ENOMEM;
io_remap_pmd_range(mm, pmd, address, end - address, address + offset, prot, space);
address = (address + PUD_SIZE) & PUD_MASK;
pud++;
} while (address < end);
return 0;
}
int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
unsigned long pfn, unsigned long size, pgprot_t prot)
{
int error = 0;
pgd_t * dir;
unsigned long beg = from;
unsigned long end = from + size;
struct mm_struct *mm = vma->vm_mm;
int space = GET_IOSPACE(pfn);
unsigned long offset = GET_PFN(pfn) << PAGE_SHIFT;
/* See comment in mm/memory.c remap_pfn_range */
vma->vm_flags |= VM_IO | VM_RESERVED | VM_UNPAGED;
prot = __pgprot(pg_iobits);
offset -= from;
dir = pgd_offset(mm, from);
flush_cache_range(vma, beg, end);
while (from < end) {
pud_t *pud = pud_alloc(mm, dir, from);
error = -ENOMEM;
if (!pud)
break;
error = io_remap_pud_range(mm, pud, from, end - from, offset + from, prot, space);
if (error)
break;
from = (from + PGDIR_SIZE) & PGDIR_MASK;
dir++;
}
flush_tlb_range(vma, beg, end);
return error;
}
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