54 lines
1.5 KiB
C
54 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_CSKY_PGTABLE_BITS_H
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#define __ASM_CSKY_PGTABLE_BITS_H
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/* implemented in software */
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#define _PAGE_ACCESSED (1<<7)
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#define _PAGE_READ (1<<8)
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#define _PAGE_WRITE (1<<9)
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#define _PAGE_PRESENT (1<<10)
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#define _PAGE_MODIFIED (1<<11)
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/* We borrow bit 7 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE (1<<7)
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/* implemented in hardware */
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#define _PAGE_GLOBAL (1<<0)
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#define _PAGE_VALID (1<<1)
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#define _PAGE_DIRTY (1<<2)
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#define _PAGE_SO (1<<5)
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#define _PAGE_BUF (1<<6)
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#define _PAGE_CACHE (1<<3)
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#define _CACHE_MASK _PAGE_CACHE
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#define _CACHE_CACHED (_PAGE_CACHE | _PAGE_BUF)
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#define _CACHE_UNCACHED (0)
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#define _PAGE_PROT_NONE _PAGE_WRITE
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/*
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* Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
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* are !pte_none() && !pte_present().
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*
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* Format of swap PTE:
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* bit 0: _PAGE_GLOBAL (zero)
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* bit 1: _PAGE_VALID (zero)
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* bit 2 - 6: swap type
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* bit 7: exclusive marker
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* bit 8: swap offset[0]
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* bit 9: _PAGE_WRITE (zero)
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* bit 10: _PAGE_PRESENT (zero)
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* bit 11 - 31: swap offset[1 - 21]
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*/
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#define __swp_type(x) (((x).val >> 2) & 0x1f)
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#define __swp_offset(x) ((((x).val >> 8) & 0x1) | \
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(((x).val >> 10) & 0x3ffffe))
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#define __swp_entry(type, offset) ((swp_entry_t) { \
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((type & 0x1f) << 2) | \
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((offset & 0x1) << 8) | \
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((offset & 0x3ffffe) << 10)})
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#endif /* __ASM_CSKY_PGTABLE_BITS_H */
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