ARM is different from other architectures in that fixmap pages are
indexed with a positive offset from FIXADDR_START. Other architectures
index with a negative offset from FIXADDR_TOP. In order to use the
generic fixmap.h definitions, this patch redefines FIXADDR_TOP to be
inclusive of the useable range. That is, FIXADDR_TOP is the virtual
address of the topmost fixed page. The newly defined FIXADDR_END is
the first virtual address past the fixed mappings.
Signed-off-by: Mark Salter <msal...@redhat.com>
CC: Russell King <li...@arm.linux.org.uk>
CC: linux-arm-ker...@lists.infradead.org
---
arch/arm/include/asm/fixmap.h | 29 ++++++++---------------------
arch/arm/mm/init.c | 2 +-
2 files changed, 9 insertions(+), 22 deletions(-)
diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h
index bbae919..68ea615 100644
--- a/arch/arm/include/asm/fixmap.h
+++ b/arch/arm/include/asm/fixmap.h
@@ -14,28 +14,15 @@
*/
#define FIXADDR_START 0xfff00000UL
-#define FIXADDR_TOP 0xfffe0000UL
-#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START)
+#define FIXADDR_END 0xfffe0000UL
+#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
-#define FIX_KMAP_BEGIN 0
-#define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT)
+enum fixed_addresses {
+ FIX_KMAP_BEGIN,
+ FIX_KMAP_END = (FIXADDR_TOP - FIXADDR_START) >> PAGE_SHIFT,
+ __end_of_fixed_addresses
+};
-#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT))
-#define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT)
-
-extern void __this_fixmap_does_not_exist(void);
-
-static inline unsigned long fix_to_virt(const unsigned int idx)
-{
- if (idx >= FIX_KMAP_END)
- __this_fixmap_does_not_exist();
- return __fix_to_virt(idx);
-}
-
-static inline unsigned int virt_to_fix(const unsigned long vaddr)
-{
- BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
- return __virt_to_fix(vaddr);
-}
+#include <asm-generic/fixmap.h>
#endif
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index ca907f8..fb61c29 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -632,7 +632,7 @@ void __init mem_init(void)
MLK(DTCM_OFFSET, (unsigned long) dtcm_end),
MLK(ITCM_OFFSET, (unsigned long) itcm_end),
#endif
- MLK(FIXADDR_START, FIXADDR_TOP),
+ MLK(FIXADDR_START, FIXADDR_END),
MLM(VMALLOC_START, VMALLOC_END),
MLM(PAGE_OFFSET, (unsigned long)high_memory),
#ifdef CONFIG_HIGHMEM
--
1.8.3.1
--
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