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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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836a241832
With commit a05e54c103 ("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: Rob Herring <robh@kernel.org>
[kees: fixed CONFIG_DEBUG_HIGHMEM get_fixmap() calls]
[kees: moved pte allocation outside of CONFIG_HIGHMEM]
Signed-off-by: Kees Cook <keescook@chromium.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
20 lines
364 B
C
20 lines
364 B
C
#ifndef _ASM_FIXMAP_H
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#define _ASM_FIXMAP_H
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#define FIXADDR_START 0xffc00000UL
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#define FIXADDR_END 0xfff00000UL
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#define FIXADDR_TOP (FIXADDR_END - PAGE_SIZE)
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#include <asm/kmap_types.h>
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enum fixed_addresses {
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FIX_KMAP_BEGIN,
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FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1,
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__end_of_fixed_addresses
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};
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#include <asm-generic/fixmap.h>
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#endif
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