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authorJeremy Fitzhardinge <jeremy@goop.org>2008-09-07 15:21:13 -0700
committerIngo Molnar <mingo@elte.hu>2008-10-13 10:20:56 +0200
commitbe43d72835ba610e4af274f2d123b26f66f4f7ed (patch)
tree004fe651aff85c6cfae6a174217b05d948b7cf6d
parent07bb2f6236f11169fbd8a8916b16715b25fea9b6 (diff)
x86: add _PAGE_IOMAP pte flag for IO mappings
Use one of the software-defined PTE bits to indicate that a mapping is intended for an IO address. On native hardware this is irrelevent, since a physical address is a physical address. But in a virtual environment, physical addresses are also virtualized, so there needs to be some way to distinguish between pseudo-physical addresses and actual hardware addresses; _PAGE_IOMAP indicates this intent. By default, __supported_pte_mask masks out _PAGE_IOMAP, so it doesn't even appear in the final pagetable. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/mm/init_32.c2
-rw-r--r--arch/x86/mm/init_64.c2
-rw-r--r--arch/x86/mm/ioremap.c8
-rw-r--r--include/asm-x86/pgtable.h14
4 files changed, 18 insertions, 8 deletions
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index bbe044dbe01..8396868e82c 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -558,7 +558,7 @@ void zap_low_mappings(void)
int nx_enabled;
-pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL);
+pteval_t __supported_pte_mask __read_mostly = ~(_PAGE_NX | _PAGE_GLOBAL | _PAGE_IOMAP);
EXPORT_SYMBOL_GPL(__supported_pte_mask);
#ifdef CONFIG_X86_PAE
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 3e10054c573..dec5c775e92 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -89,7 +89,7 @@ early_param("gbpages", parse_direct_gbpages_on);
int after_bootmem;
-unsigned long __supported_pte_mask __read_mostly = ~0UL;
+pteval_t __supported_pte_mask __read_mostly = ~_PAGE_IOMAP;
EXPORT_SYMBOL_GPL(__supported_pte_mask);
static int do_not_nx __cpuinitdata;
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 8cbeda15cd2..43c3b6896cd 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -242,16 +242,16 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
switch (prot_val) {
case _PAGE_CACHE_UC:
default:
- prot = PAGE_KERNEL_NOCACHE;
+ prot = PAGE_KERNEL_IO_NOCACHE;
break;
case _PAGE_CACHE_UC_MINUS:
- prot = PAGE_KERNEL_UC_MINUS;
+ prot = PAGE_KERNEL_IO_UC_MINUS;
break;
case _PAGE_CACHE_WC:
- prot = PAGE_KERNEL_WC;
+ prot = PAGE_KERNEL_IO_WC;
break;
case _PAGE_CACHE_WB:
- prot = PAGE_KERNEL;
+ prot = PAGE_KERNEL_IO;
break;
}
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h
index ed932453ef2..81805403b64 100644
--- a/include/asm-x86/pgtable.h
+++ b/include/asm-x86/pgtable.h
@@ -15,7 +15,7 @@
#define _PAGE_BIT_PAT 7 /* on 4KB pages */
#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
#define _PAGE_BIT_UNUSED1 9 /* available for programmer */
-#define _PAGE_BIT_UNUSED2 10
+#define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
#define _PAGE_BIT_UNUSED3 11
#define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
#define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
@@ -32,7 +32,7 @@
#define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
#define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
#define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
-#define _PAGE_UNUSED2 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED2)
+#define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
#define _PAGE_UNUSED3 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED3)
#define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
#define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
@@ -99,6 +99,11 @@
#define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
+#define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
+#define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
+#define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
+#define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
+
#define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
#define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
@@ -113,6 +118,11 @@
#define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VSYSCALL_NOCACHE __pgprot(__PAGE_KERNEL_VSYSCALL_NOCACHE)
+#define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
+#define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
+#define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
+#define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
+
/* xwr */
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY