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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASMPARISC_SHMPARAM_H #define _ASMPARISC_SHMPARAM_H /* * PA-RISC uses virtually indexed & physically tagged (VIPT) caches * which has strict requirements when two pages to the same physical * address are accessed through different mappings. Read the section * "Address Aliasing" in the arch docs for more detail: * PA-RISC 1.1 (page 3-6): * https://parisc.wiki.kernel.org/images-parisc/6/68/Pa11_acd.pdf * PA-RISC 2.0 (page F-5): * https://parisc.wiki.kernel.org/images-parisc/7/73/Parisc2.0.pdf * * For Linux we allow kernel and userspace to map pages on page size * granularity (SHMLBA) but have to ensure that, if two pages are * mapped to the same physical address, the virtual and physical * addresses modulo SHM_COLOUR are identical. */ #define SHMLBA PAGE_SIZE /* attach addr a multiple of this */ #define SHM_COLOUR 0x00400000 /* shared mappings colouring */ #endif /* _ASMPARISC_SHMPARAM_H */