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arm: use generic fixmap.h 

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 <msalter@redhat.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
[kees: update for a05e54c103 ("ARM: 8031/2: change fixmap ...")]
Signed-off-by: Kees Cook <keescook@chromium.org>
Cc: Laura Abbott <lauraa@codeaurora.org>
Cc: Rob Herring <robh@kernel.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
This commit is contained in:
Mark Salter 2014-08-13 09:04:49 -07:00 committed by Kees Cook
parent bfe01a5ba2
commit b615bbbff1
2 changed files with 10 additions and 19 deletions
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27
arch/arm/include/asm/fixmap.h
View File

@ -2,27 +2,18 @@
#define _ASM_FIXMAP_H
#define FIXADDR_START 0xffc00000UL
#define FIXADDR_TOP 0xffe00000UL
#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START)
#define FIXADDR_END 0xffe00000UL
#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
#define FIX_KMAP_NR_PTES (FIXADDR_SIZE >> PAGE_SHIFT)
#include <asm/kmap_types.h>
#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT))
#define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT)
enum fixed_addresses {
FIX_KMAP_BEGIN,
FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
extern void __this_fixmap_does_not_exist(void);
__end_of_fixed_addresses
};
static inline unsigned long fix_to_virt(const unsigned int idx)
{
if (idx >= FIX_KMAP_NR_PTES)
__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

2
arch/arm/mm/init.c
View File

@ -570,7 +570,7 @@ 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