Lines Matching +full:memory +full:- +full:region
2 Memory Attribute Aliasing on IA-64
10 Memory Attributes
13 Itanium supports several attributes for virtual memory references.
19 WB Write-back (cacheable)
21 WC Write-coalescing
24 System memory typically uses the WB attribute. The UC attribute is
25 used for memory-mapped I/O devices. The WC attribute is uncacheable
34 support either WB or UC access to main memory, while others support
37 Memory Map
40 Platform firmware describes the physical memory map and the
41 supported attributes for each region. At boot-time, the kernel uses
42 the EFI GetMemoryMap() interface. ACPI can also describe memory
47 learn the attributes supported by each region of physical address
53 memory Linux is actually using and the attribute for each region.
54 This contains only system memory; it does not contain MMIO space.
57 memory described by the efi_memmap. Linux/ia64 can't use all memory
62 boot-time information is required for kexec.
75 Therefore, kern_memmap contains only full granule-sized regions that
89 homogeneous with respect to memory attributes.
97 ----------------
100 mappings may be either WB or UC. If the region being mapped
105 If the region is not in kern_memmap, the user mapping should use
106 an attribute reported as being supported in the EFI memory map.
108 Since the EFI memory map does not describe MMIO on some
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127 ------------------------------
132 If WC is requested, and the region in kern_memmap is either WC
133 or UC, and the EFI memory map designates the region as WC, then
140 ----------------------
150 registers typically can be accessed only with four-byte or
151 eight-byte accesses, and the copy_from_user() path doesn't allow
155 ---------
159 If the region is in kern_memmap, we should use the attribute
162 If the EFI memory map reports that the entire granule supports
166 If the granule contains non-WB memory, but we can cover the
167 region safely with kernel page table mappings, we can use
176 --------------------------------------------------------------------
178 The EFI memory map may not report these MMIO regions.
181 when the EFI memory map is incomplete, every /dev/mem mmap must
183 on whether the region is in kern_memmap or the EFI memory map.
185 mmap of 0x0-0x9FFFF /dev/mem by "hwinfo" on HP sx1000 with VGA enabled
186 ----------------------------------------------------------------------
188 The EFI memory map reports the following attributes:
191 0x00000-0x9FFFF WB only
192 0xA0000-0xBFFFF UC only (VGA frame buffer)
193 0xC0000-0xFFFFF WB only
200 which uses a granule-sized UC mapping. This granule will cover some
201 WB-only memory, but since UC is non-speculative, the processor will
202 never generate an uncacheable reference to the WB-only areas unless
205 mmap of 0x0-0xFFFFF legacy_mem by "X"
206 -------------------------------------
208 If the EFI memory map reports that the entire range supports the
219 mmap and force the user to map just the specific region of interest.
221 mmap of 0xA0000-0xBFFFF legacy_mem by "X" on HP sx1000 with VGA disabled
222 ------------------------------------------------------------------------
224 The EFI memory map reports the following attributes::
226 0x00000-0xFFFFF WB only (no VGA MMIO hole)
232 ----------------------------