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>
88 lines
3.1 KiB
Text
88 lines
3.1 KiB
Text
Kernel Memory Layout on ARM Linux
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Russell King <rmk@arm.linux.org.uk>
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November 17, 2005 (2.6.15)
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This document describes the virtual memory layout which the Linux
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kernel uses for ARM processors. It indicates which regions are
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free for platforms to use, and which are used by generic code.
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The ARM CPU is capable of addressing a maximum of 4GB virtual memory
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space, and this must be shared between user space processes, the
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kernel, and hardware devices.
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As the ARM architecture matures, it becomes necessary to reserve
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certain regions of VM space for use for new facilities; therefore
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this document may reserve more VM space over time.
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Start End Use
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--------------------------------------------------------------------------
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ffff8000 ffffffff copy_user_page / clear_user_page use.
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For SA11xx and Xscale, this is used to
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setup a minicache mapping.
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ffff4000 ffffffff cache aliasing on ARMv6 and later CPUs.
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ffff1000 ffff7fff Reserved.
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Platforms must not use this address range.
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ffff0000 ffff0fff CPU vector page.
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The CPU vectors are mapped here if the
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CPU supports vector relocation (control
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register V bit.)
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fffe0000 fffeffff XScale cache flush area. This is used
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in proc-xscale.S to flush the whole data
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cache. (XScale does not have TCM.)
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fffe8000 fffeffff DTCM mapping area for platforms with
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DTCM mounted inside the CPU.
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fffe0000 fffe7fff ITCM mapping area for platforms with
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ITCM mounted inside the CPU.
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ffc00000 ffefffff Fixmap mapping region. Addresses provided
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by fix_to_virt() will be located here.
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fee00000 feffffff Mapping of PCI I/O space. This is a static
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mapping within the vmalloc space.
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VMALLOC_START VMALLOC_END-1 vmalloc() / ioremap() space.
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Memory returned by vmalloc/ioremap will
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be dynamically placed in this region.
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Machine specific static mappings are also
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located here through iotable_init().
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VMALLOC_START is based upon the value
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of the high_memory variable, and VMALLOC_END
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is equal to 0xff000000.
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PAGE_OFFSET high_memory-1 Kernel direct-mapped RAM region.
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This maps the platforms RAM, and typically
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maps all platform RAM in a 1:1 relationship.
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PKMAP_BASE PAGE_OFFSET-1 Permanent kernel mappings
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One way of mapping HIGHMEM pages into kernel
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space.
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MODULES_VADDR MODULES_END-1 Kernel module space
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Kernel modules inserted via insmod are
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placed here using dynamic mappings.
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00001000 TASK_SIZE-1 User space mappings
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Per-thread mappings are placed here via
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the mmap() system call.
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00000000 00000fff CPU vector page / null pointer trap
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CPUs which do not support vector remapping
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place their vector page here. NULL pointer
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dereferences by both the kernel and user
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space are also caught via this mapping.
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Please note that mappings which collide with the above areas may result
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in a non-bootable kernel, or may cause the kernel to (eventually) panic
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at run time.
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Since future CPUs may impact the kernel mapping layout, user programs
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must not access any memory which is not mapped inside their 0x0001000
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to TASK_SIZE address range. If they wish to access these areas, they
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must set up their own mappings using open() and mmap().
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