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Date: Tue, 17 Jun 2008 11:41:59 -0700
From: Jeremy Fitzhardinge <jeremy@...p.org>
To: the arch/x86 maintainers <x86@...nel.org>
CC: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/4] x86: implement set_pte_vaddr
Re-name set_pte_pfn() to set_pte_vaddr(), taking a pte_t rather than
pfn/flags, and expose it. This allows the pte to constructed in
arbitrary ways, rather than just via __pte(), which may be necessary
in a virtual environment.
Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
---
arch/x86/mm/init_64.c | 9 ++++-----
arch/x86/mm/pgtable.c | 2 +-
arch/x86/mm/pgtable_32.c | 6 +++---
include/asm-x86/pgtable.h | 3 +++
4 files changed, 11 insertions(+), 9 deletions(-)
===================================================================
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -136,15 +136,15 @@ static __init void *spp_getpage(void)
return ptr;
}
-static void
-set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
+void
+set_pte_vaddr(unsigned long vaddr, pte_t new_pte)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
- pte_t *pte, new_pte;
+ pte_t *pte;
- pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys);
+ pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(new_pte));
pgd = pgd_offset_k(vaddr);
if (pgd_none(*pgd)) {
@@ -171,7 +171,6 @@ set_pte_phys(unsigned long vaddr, unsign
return;
}
}
- new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
pte = pte_offset_kernel(pmd, vaddr);
if (!pte_none(*pte) && pte_val(new_pte) &&
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
===================================================================
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -285,6 +285,6 @@ void __set_fixmap (enum fixed_addresses
BUG();
return;
}
- set_pte_pfn(address, phys >> PAGE_SHIFT, flags);
+ set_pte_vaddr(address, pfn_pte(phys >> PAGE_SHIFT, flags));
fixmaps_set++;
}
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
===================================================================
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -71,7 +71,7 @@ void show_mem(void)
* Associate a virtual page frame with a given physical page frame
* and protection flags for that frame.
*/
-static void set_pte_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
+void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
pud_t *pud;
@@ -94,8 +94,8 @@ static void set_pte_pfn(unsigned long va
return;
}
pte = pte_offset_kernel(pmd, vaddr);
- if (pgprot_val(flags))
- set_pte_present(&init_mm, vaddr, pte, pfn_pte(pfn, flags));
+ if (pte_val(pteval))
+ set_pte_present(&init_mm, vaddr, pte, pteval);
else
pte_clear(&init_mm, vaddr, pte);
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
===================================================================
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -313,6 +313,9 @@ int phys_mem_access_prot_allowed(struct
unsigned long size, pgprot_t *vma_prot);
#endif
+/* Install a pte for a particular vaddr in kernel space. */
+void set_pte_vaddr(unsigned long vaddr, pte_t pte);
+
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>
#else /* !CONFIG_PARAVIRT */
--
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