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