cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pgtable-bits.h (5275B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
      4 */
      5#ifndef _ASM_PGTABLE_BITS_H
      6#define _ASM_PGTABLE_BITS_H
      7
      8/* Page table bits */
      9#define	_PAGE_VALID_SHIFT	0
     10#define	_PAGE_ACCESSED_SHIFT	0  /* Reuse Valid for Accessed */
     11#define	_PAGE_DIRTY_SHIFT	1
     12#define	_PAGE_PLV_SHIFT		2  /* 2~3, two bits */
     13#define	_CACHE_SHIFT		4  /* 4~5, two bits */
     14#define	_PAGE_GLOBAL_SHIFT	6
     15#define	_PAGE_HUGE_SHIFT	6  /* HUGE is a PMD bit */
     16#define	_PAGE_PRESENT_SHIFT	7
     17#define	_PAGE_WRITE_SHIFT	8
     18#define	_PAGE_MODIFIED_SHIFT	9
     19#define	_PAGE_PROTNONE_SHIFT	10
     20#define	_PAGE_SPECIAL_SHIFT	11
     21#define	_PAGE_HGLOBAL_SHIFT	12 /* HGlobal is a PMD bit */
     22#define	_PAGE_PFN_SHIFT		12
     23#define	_PAGE_PFN_END_SHIFT	48
     24#define	_PAGE_NO_READ_SHIFT	61
     25#define	_PAGE_NO_EXEC_SHIFT	62
     26#define	_PAGE_RPLV_SHIFT	63
     27
     28/* Used by software */
     29#define _PAGE_PRESENT		(_ULCAST_(1) << _PAGE_PRESENT_SHIFT)
     30#define _PAGE_WRITE		(_ULCAST_(1) << _PAGE_WRITE_SHIFT)
     31#define _PAGE_ACCESSED		(_ULCAST_(1) << _PAGE_ACCESSED_SHIFT)
     32#define _PAGE_MODIFIED		(_ULCAST_(1) << _PAGE_MODIFIED_SHIFT)
     33#define _PAGE_PROTNONE		(_ULCAST_(1) << _PAGE_PROTNONE_SHIFT)
     34#define _PAGE_SPECIAL		(_ULCAST_(1) << _PAGE_SPECIAL_SHIFT)
     35
     36/* Used by TLB hardware (placed in EntryLo*) */
     37#define _PAGE_VALID		(_ULCAST_(1) << _PAGE_VALID_SHIFT)
     38#define _PAGE_DIRTY		(_ULCAST_(1) << _PAGE_DIRTY_SHIFT)
     39#define _PAGE_PLV		(_ULCAST_(3) << _PAGE_PLV_SHIFT)
     40#define _PAGE_GLOBAL		(_ULCAST_(1) << _PAGE_GLOBAL_SHIFT)
     41#define _PAGE_HUGE		(_ULCAST_(1) << _PAGE_HUGE_SHIFT)
     42#define _PAGE_HGLOBAL		(_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT)
     43#define _PAGE_NO_READ		(_ULCAST_(1) << _PAGE_NO_READ_SHIFT)
     44#define _PAGE_NO_EXEC		(_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT)
     45#define _PAGE_RPLV		(_ULCAST_(1) << _PAGE_RPLV_SHIFT)
     46#define _CACHE_MASK		(_ULCAST_(3) << _CACHE_SHIFT)
     47#define _PFN_SHIFT		(PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT)
     48
     49#define _PAGE_USER	(PLV_USER << _PAGE_PLV_SHIFT)
     50#define _PAGE_KERN	(PLV_KERN << _PAGE_PLV_SHIFT)
     51
     52#define _PFN_MASK (~((_ULCAST_(1) << (_PFN_SHIFT)) - 1) & \
     53		  ((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1))
     54
     55/*
     56 * Cache attributes
     57 */
     58#ifndef _CACHE_SUC
     59#define _CACHE_SUC			(0<<_CACHE_SHIFT) /* Strong-ordered UnCached */
     60#endif
     61#ifndef _CACHE_CC
     62#define _CACHE_CC			(1<<_CACHE_SHIFT) /* Coherent Cached */
     63#endif
     64#ifndef _CACHE_WUC
     65#define _CACHE_WUC			(2<<_CACHE_SHIFT) /* Weak-ordered UnCached */
     66#endif
     67
     68#define __READABLE	(_PAGE_VALID)
     69#define __WRITEABLE	(_PAGE_DIRTY | _PAGE_WRITE)
     70
     71#define _PAGE_CHG_MASK	(_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV)
     72#define _HPAGE_CHG_MASK	(_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE)
     73
     74#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \
     75				 _PAGE_USER | _CACHE_CC)
     76#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_WRITE | \
     77				 _PAGE_USER | _CACHE_CC)
     78#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC)
     79
     80#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
     81				 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC)
     82#define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
     83				 _PAGE_GLOBAL | _PAGE_KERN |  _CACHE_SUC)
     84#define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
     85				 _PAGE_GLOBAL | _PAGE_KERN |  _CACHE_WUC)
     86
     87#define __P000 __pgprot(_CACHE_CC | _PAGE_USER | _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ)
     88#define __P001 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
     89#define __P010 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
     90#define __P011 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
     91#define __P100 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
     92#define __P101 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
     93#define __P110 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
     94#define __P111 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
     95
     96#define __S000 __pgprot(_CACHE_CC | _PAGE_USER | _PAGE_PROTNONE | _PAGE_NO_EXEC | _PAGE_NO_READ)
     97#define __S001 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC)
     98#define __S010 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE)
     99#define __S011 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_NO_EXEC | _PAGE_WRITE)
    100#define __S100 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
    101#define __S101 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT)
    102#define __S110 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE)
    103#define __S111 __pgprot(_CACHE_CC | _PAGE_VALID | _PAGE_USER | _PAGE_PRESENT | _PAGE_WRITE)
    104
    105#ifndef __ASSEMBLY__
    106
    107#define pgprot_noncached pgprot_noncached
    108
    109static inline pgprot_t pgprot_noncached(pgprot_t _prot)
    110{
    111	unsigned long prot = pgprot_val(_prot);
    112
    113	prot = (prot & ~_CACHE_MASK) | _CACHE_SUC;
    114
    115	return __pgprot(prot);
    116}
    117
    118#define pgprot_writecombine pgprot_writecombine
    119
    120static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
    121{
    122	unsigned long prot = pgprot_val(_prot);
    123
    124	prot = (prot & ~_CACHE_MASK) | _CACHE_WUC;
    125
    126	return __pgprot(prot);
    127}
    128
    129#endif /* !__ASSEMBLY__ */
    130
    131#endif /* _ASM_PGTABLE_BITS_H */