Commit 836a2418 authored by Rob Herring's avatar Rob Herring Committed by Kees Cook
Browse files

ARM: expand fixmap region to 3MB 



With commit a05e54c1 ("ARM: 8031/2: change fixmap mapping region to
support 32 CPUs"), the fixmap region was expanded to 2MB, but it
precluded any other uses of the fixmap region. In order to support other
uses the fixmap region needs to be expanded beyond 2MB. Fortunately, the
adjacent 1MB range 0xffe00000-0xfff00000 is availabe.

Remove fixmap_page_table ptr and lookup the page table via the virtual
address so that the fixmap region can span more that one pmd. The 2nd
pmd is already created since it is shared with the vector page.

Signed-off-by: default avatarRob Herring <robh@kernel.org>
[kees: fixed CONFIG_DEBUG_HIGHMEM get_fixmap() calls]
[kees: moved pte allocation outside of CONFIG_HIGHMEM]
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Acked-by: default avatarNicolas Pitre <nico@linaro.org>
parent b615bbbf

Documentation/arm/memory.txt

+1 −1
Original line number Diff line number Diff line
@@ -41,7 +41,7 @@ fffe8000 fffeffff DTCM mapping area for platforms with 
fffe0000	fffe7fff	ITCM mapping area for platforms with

				ITCM mounted inside the CPU.



ffc00000	ffdfffff	Fixmap mapping region.  Addresses provided

ffc00000	ffefffff	Fixmap mapping region.  Addresses provided

				by fix_to_virt() will be located here.



fee00000	feffffff	Mapping of PCI I/O space. This is a static

arch/arm/include/asm/fixmap.h

+1 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
#define _ASM_FIXMAP_H



#define FIXADDR_START		0xffc00000UL

#define FIXADDR_END		0xffe00000UL

#define FIXADDR_END		0xfff00000UL

#define FIXADDR_TOP		(FIXADDR_END - PAGE_SIZE)



#include <asm/kmap_types.h>

arch/arm/mm/highmem.c

+8 −7
Original line number Diff line number Diff line
@@ -18,19 +18,20 @@ 
#include <asm/tlbflush.h>

#include "mm.h"



pte_t *fixmap_page_table;



static inline void set_fixmap_pte(int idx, pte_t pte)

{

	unsigned long vaddr = __fix_to_virt(idx);

	set_pte_ext(fixmap_page_table + idx, pte, 0);

	pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);



	set_pte_ext(ptep, pte, 0);

	local_flush_tlb_kernel_page(vaddr);

}



static inline pte_t get_fixmap_pte(unsigned long vaddr)

{

	unsigned long idx = __virt_to_fix(vaddr);

	return *(fixmap_page_table + idx);

	pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);



	return *ptep;

}



void *kmap(struct page *page)
@@ -84,7 +85,7 @@ void *kmap_atomic(struct page *page) 
	 * With debugging enabled, kunmap_atomic forces that entry to 0.

	 * Make sure it was indeed properly unmapped.

	 */

	BUG_ON(!pte_none(*(fixmap_page_table + idx)));

	BUG_ON(!pte_none(get_fixmap_pte(vaddr)));

#endif

	/*

	 * When debugging is off, kunmap_atomic leaves the previous mapping
@@ -134,7 +135,7 @@ void *kmap_atomic_pfn(unsigned long pfn) 
	idx = type + KM_TYPE_NR * smp_processor_id();

	vaddr = __fix_to_virt(idx);

#ifdef CONFIG_DEBUG_HIGHMEM

	BUG_ON(!pte_none(*(fixmap_page_table + idx)));

	BUG_ON(!pte_none(get_fixmap_pte(vaddr)));

#endif

	set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));

arch/arm/mm/mmu.c

+3 −3
Original line number Diff line number Diff line
@@ -1326,10 +1326,10 @@ static void __init kmap_init(void) 
#ifdef CONFIG_HIGHMEM

	pkmap_page_table = early_pte_alloc(pmd_off_k(PKMAP_BASE),

		PKMAP_BASE, _PAGE_KERNEL_TABLE);



	fixmap_page_table = early_pte_alloc(pmd_off_k(FIXADDR_START),

		FIXADDR_START, _PAGE_KERNEL_TABLE);

#endif



	early_pte_alloc(pmd_off_k(FIXADDR_START), FIXADDR_START,

			_PAGE_KERNEL_TABLE);

}



static void __init map_lowmem(void)

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