From a05e54c103b0b8e1dab5d04b411f1d48387c4903 Mon Sep 17 00:00:00 2001 From: Liu Hua Date: Fri, 18 Apr 2014 09:43:32 +0100 Subject: ARM: 8031/2: change fixmap mapping region to support 32 CPUs In 32-bit ARM systems, the fixmap mapping region can support no more than 14 CPUs(total: 896k; one CPU: 64K). And we can configure NR_CPUS up to 32. So there is a mismatch. This patch moves fixmapping region downwards to region 0xffc00000- 0xffe00000. Then the fixmap mapping region can support up to 32 CPUs. Reviewed-by: Nicolas Pitre Signed-off-by: Liu Hua Signed-off-by: Russell King --- arch/arm/include/asm/fixmap.h | 16 ++-------------- arch/arm/include/asm/highmem.h | 1 + 2 files changed, 3 insertions(+), 14 deletions(-) (limited to 'arch/arm/include/asm') diff --git a/arch/arm/include/asm/fixmap.h b/arch/arm/include/asm/fixmap.h index be55ebc08ed4..74124b0d0d79 100644 --- a/arch/arm/include/asm/fixmap.h +++ b/arch/arm/include/asm/fixmap.h @@ -1,20 +1,8 @@ #ifndef _ASM_FIXMAP_H #define _ASM_FIXMAP_H -/* - * Nothing too fancy for now. - * - * On ARM we already have well known fixed virtual addresses imposed by - * the architecture such as the vector page which is located at 0xffff0000, - * therefore a second level page table is already allocated covering - * 0xfff00000 upwards. - * - * The cache flushing code in proc-xscale.S uses the virtual area between - * 0xfffe0000 and 0xfffeffff. - */ - -#define FIXADDR_START 0xfff00000UL -#define FIXADDR_TOP 0xfffe0000UL +#define FIXADDR_START 0xffc00000UL +#define FIXADDR_TOP 0xffe00000UL #define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) #define FIX_KMAP_NR_PTES (FIXADDR_SIZE >> PAGE_SHIFT) diff --git a/arch/arm/include/asm/highmem.h b/arch/arm/include/asm/highmem.h index 91b99abe7a95..535579511ed0 100644 --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -18,6 +18,7 @@ } while (0) extern pte_t *pkmap_page_table; +extern pte_t *fixmap_page_table; extern void *kmap_high(struct page *page); extern void kunmap_high(struct page *page); -- cgit v1.2.1