126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_PGTABLE_BITS_H
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#define _ASM_PGTABLE_BITS_H
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/* Page table bits */
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#define _PAGE_VALID_SHIFT 0
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#define _PAGE_ACCESSED_SHIFT 0 /* Reuse Valid for Accessed */
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#define _PAGE_DIRTY_SHIFT 1
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#define _PAGE_PLV_SHIFT 2 /* 2~3, two bits */
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#define _CACHE_SHIFT 4 /* 4~5, two bits */
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#define _PAGE_GLOBAL_SHIFT 6
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#define _PAGE_HUGE_SHIFT 6 /* HUGE is a PMD bit */
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#define _PAGE_PRESENT_SHIFT 7
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#define _PAGE_WRITE_SHIFT 8
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#define _PAGE_MODIFIED_SHIFT 9
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#define _PAGE_PROTNONE_SHIFT 10
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#define _PAGE_SPECIAL_SHIFT 11
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#define _PAGE_HGLOBAL_SHIFT 12 /* HGlobal is a PMD bit */
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#define _PAGE_PFN_SHIFT 12
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#define _PAGE_SWP_EXCLUSIVE_SHIFT 23
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#define _PAGE_PFN_END_SHIFT 48
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#define _PAGE_DEVMAP_SHIFT 59
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#define _PAGE_PRESENT_INVALID_SHIFT 60
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#define _PAGE_NO_READ_SHIFT 61
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#define _PAGE_NO_EXEC_SHIFT 62
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#define _PAGE_RPLV_SHIFT 63
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/* Used by software */
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#define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT)
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#define _PAGE_PRESENT_INVALID (_ULCAST_(1) << _PAGE_PRESENT_INVALID_SHIFT)
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#define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT)
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#define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT)
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#define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)
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#define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT)
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#define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT)
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#define _PAGE_DEVMAP (_ULCAST_(1) << _PAGE_DEVMAP_SHIFT)
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/* We borrow bit 23 to store the exclusive marker in swap PTEs. */
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#define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT)
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/* Used by TLB hardware (placed in EntryLo*) */
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#define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT)
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#define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT)
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#define _PAGE_PLV (_ULCAST_(3) << _PAGE_PLV_SHIFT)
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#define _PAGE_GLOBAL (_ULCAST_(1) << _PAGE_GLOBAL_SHIFT)
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#define _PAGE_HUGE (_ULCAST_(1) << _PAGE_HUGE_SHIFT)
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#define _PAGE_HGLOBAL (_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT)
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#define _PAGE_NO_READ (_ULCAST_(1) << _PAGE_NO_READ_SHIFT)
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#define _PAGE_NO_EXEC (_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT)
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#define _PAGE_RPLV (_ULCAST_(1) << _PAGE_RPLV_SHIFT)
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#define _CACHE_MASK (_ULCAST_(3) << _CACHE_SHIFT)
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#define PFN_PTE_SHIFT (PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT)
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#define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT)
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#define _PAGE_KERN (PLV_KERN << _PAGE_PLV_SHIFT)
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#define _PFN_MASK (~((_ULCAST_(1) << (PFN_PTE_SHIFT)) - 1) & \
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((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1))
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/*
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* Cache attributes
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*/
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#ifndef _CACHE_SUC
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#define _CACHE_SUC (0<<_CACHE_SHIFT) /* Strong-ordered UnCached */
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#endif
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#ifndef _CACHE_CC
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#define _CACHE_CC (1<<_CACHE_SHIFT) /* Coherent Cached */
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#endif
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#ifndef _CACHE_WUC
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#define _CACHE_WUC (2<<_CACHE_SHIFT) /* Weak-ordered UnCached */
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#endif
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#define __READABLE (_PAGE_VALID)
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#define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE)
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#define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
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#define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
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#define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \
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_PAGE_USER | _CACHE_CC)
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#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
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_PAGE_USER | _CACHE_CC)
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#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC)
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#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
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_PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC)
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#define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
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_PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC)
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#define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
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_PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC)
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#ifndef __ASSEMBLY__
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#define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL_SUC)
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot = (prot & ~_CACHE_MASK) | _CACHE_SUC;
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return __pgprot(prot);
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}
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extern bool wc_enabled;
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#define pgprot_writecombine pgprot_writecombine
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static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
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{
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unsigned long prot = pgprot_val(_prot);
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prot = (prot & ~_CACHE_MASK) | (wc_enabled ? _CACHE_WUC : _CACHE_SUC);
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return __pgprot(prot);
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_PGTABLE_BITS_H */
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