95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
/*
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* omap iommu: pagetable definitions
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*
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* Copyright (C) 2008-2010 Nokia Corporation
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*
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* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/*
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* "L2 table" address mask and size definitions.
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*/
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#define IOPGD_SHIFT 20
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#define IOPGD_SIZE (1UL << IOPGD_SHIFT)
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#define IOPGD_MASK (~(IOPGD_SIZE - 1))
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/*
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* "section" address mask and size definitions.
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*/
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#define IOSECTION_SHIFT 20
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#define IOSECTION_SIZE (1UL << IOSECTION_SHIFT)
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#define IOSECTION_MASK (~(IOSECTION_SIZE - 1))
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/*
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* "supersection" address mask and size definitions.
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*/
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#define IOSUPER_SHIFT 24
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#define IOSUPER_SIZE (1UL << IOSUPER_SHIFT)
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#define IOSUPER_MASK (~(IOSUPER_SIZE - 1))
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#define PTRS_PER_IOPGD (1UL << (32 - IOPGD_SHIFT))
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#define IOPGD_TABLE_SIZE (PTRS_PER_IOPGD * sizeof(u32))
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/*
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* "small page" address mask and size definitions.
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*/
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#define IOPTE_SHIFT 12
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#define IOPTE_SIZE (1UL << IOPTE_SHIFT)
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#define IOPTE_MASK (~(IOPTE_SIZE - 1))
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/*
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* "large page" address mask and size definitions.
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*/
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#define IOLARGE_SHIFT 16
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#define IOLARGE_SIZE (1UL << IOLARGE_SHIFT)
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#define IOLARGE_MASK (~(IOLARGE_SIZE - 1))
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#define PTRS_PER_IOPTE (1UL << (IOPGD_SHIFT - IOPTE_SHIFT))
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#define IOPTE_TABLE_SIZE (PTRS_PER_IOPTE * sizeof(u32))
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#define IOPAGE_MASK IOPTE_MASK
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/**
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* omap_iommu_translate() - va to pa translation
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* @d: omap iommu descriptor
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* @va: virtual address
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* @mask: omap iommu descriptor mask
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*
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* va to pa translation
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*/
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static inline phys_addr_t omap_iommu_translate(u32 d, u32 va, u32 mask)
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{
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return (d & mask) | (va & (~mask));
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}
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/*
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* some descriptor attributes.
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*/
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#define IOPGD_TABLE (1 << 0)
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#define IOPGD_SECTION (2 << 0)
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#define IOPGD_SUPER (1 << 18 | 2 << 0)
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#define iopgd_is_table(x) (((x) & 3) == IOPGD_TABLE)
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#define iopgd_is_section(x) (((x) & (1 << 18 | 3)) == IOPGD_SECTION)
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#define iopgd_is_super(x) (((x) & (1 << 18 | 3)) == IOPGD_SUPER)
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#define IOPTE_SMALL (2 << 0)
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#define IOPTE_LARGE (1 << 0)
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#define iopte_is_small(x) (((x) & 2) == IOPTE_SMALL)
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#define iopte_is_large(x) (((x) & 3) == IOPTE_LARGE)
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/* to find an entry in a page-table-directory */
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#define iopgd_index(da) (((da) >> IOPGD_SHIFT) & (PTRS_PER_IOPGD - 1))
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#define iopgd_offset(obj, da) ((obj)->iopgd + iopgd_index(da))
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#define iopgd_page_paddr(iopgd) (*iopgd & ~((1 << 10) - 1))
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#define iopgd_page_vaddr(iopgd) ((u32 *)phys_to_virt(iopgd_page_paddr(iopgd)))
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/* to find an entry in the second-level page table. */
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#define iopte_index(da) (((da) >> IOPTE_SHIFT) & (PTRS_PER_IOPTE - 1))
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#define iopte_offset(iopgd, da) (iopgd_page_vaddr(iopgd) + iopte_index(da))
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