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sh: Generalise the pte handling code for the fixmap path

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Generalise the code for setting and clearing pte's and allow TLB entries
to be pinned and unpinned if the _PAGE_WIRED flag is present.

Signed-off-by: Matt Fleming <matt@console-pimps.org>
This commit is contained in:
Matt Fleming 2009-11-17 22:03:41 +00:00
parent 24ef7fc4dc
commit 07cad4dc1b
2 changed files with 41 additions and 4 deletions
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1
arch/sh/include/asm/fixmap.h
View file

@ -65,6 +65,7 @@ enum fixed_addresses {
extern void __set_fixmap(enum fixed_addresses idx,
unsigned long phys, pgprot_t flags);
extern void __clear_fixmap(enum fixed_addresses idx, pgprot_t flags);
#define set_fixmap(idx, phys) \
__set_fixmap(idx, phys, PAGE_KERNEL)

44
arch/sh/mm/init.c
View file

@ -39,7 +39,7 @@ unsigned long cached_to_uncached = P2SEG - P1SEG;
#endif
#ifdef CONFIG_MMU
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
static pte_t *__get_pte_phys(unsigned long addr)
{
pgd_t *pgd;
pud_t *pud;
@ -49,22 +49,30 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
pgd = pgd_offset_k(addr);
if (pgd_none(*pgd)) {
pgd_ERROR(*pgd);
return;
return NULL;
}
pud = pud_alloc(NULL, pgd, addr);
if (unlikely(!pud)) {
pud_ERROR(*pud);
return;
return NULL;
}
pmd = pmd_alloc(NULL, pud, addr);
if (unlikely(!pmd)) {
pmd_ERROR(*pmd);
return;
return NULL;
}
pte = pte_offset_kernel(pmd, addr);
return pte;
}
static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
{
pte_t *pte;
pte = __get_pte_phys(addr);
if (!pte_none(*pte)) {
pte_ERROR(*pte);
return;
@ -72,6 +80,22 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
local_flush_tlb_one(get_asid(), addr);
if (pgprot_val(prot) & _PAGE_WIRED)
tlb_wire_entry(NULL, addr, *pte);
}
static void clear_pte_phys(unsigned long addr, pgprot_t prot)
{
pte_t *pte;
pte = __get_pte_phys(addr);
if (pgprot_val(prot) & _PAGE_WIRED)
tlb_unwire_entry();
set_pte(pte, pfn_pte(0, __pgprot(0)));
local_flush_tlb_one(get_asid(), addr);
}
/*
@ -101,6 +125,18 @@ void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
set_pte_phys(address, phys, prot);
}
void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
{
unsigned long address = __fix_to_virt(idx);
if (idx >= __end_of_fixed_addresses) {
BUG();
return;
}
clear_pte_phys(address, prot);
}
void __init page_table_range_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{