cregit-Linux how code gets into the kernel

Release 4.16 arch/powerpc/include/asm/pte-common.h

Directory: arch/powerpc/include/asm
/* SPDX-License-Identifier: GPL-2.0 */
/* Included from asm/pgtable-*.h only ! */

/*
 * Some bits are only used on some cpu families... Make sure that all
 * the undefined gets a sensible default
 */
#ifndef _PAGE_HASHPTE

#define _PAGE_HASHPTE	0
#endif
#ifndef _PAGE_HWWRITE

#define _PAGE_HWWRITE	0
#endif
#ifndef _PAGE_EXEC

#define _PAGE_EXEC	0
#endif
#ifndef _PAGE_ENDIAN

#define _PAGE_ENDIAN	0
#endif
#ifndef _PAGE_COHERENT

#define _PAGE_COHERENT	0
#endif
#ifndef _PAGE_WRITETHRU

#define _PAGE_WRITETHRU	0
#endif
#ifndef _PAGE_4K_PFN

#define _PAGE_4K_PFN		0
#endif
#ifndef _PAGE_SAO

#define _PAGE_SAO	0
#endif
#ifndef _PAGE_PSIZE

#define _PAGE_PSIZE		0
#endif
/* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
#ifndef _PAGE_RO

#define _PAGE_RO 0
#else

#define _PAGE_RW 0
#endif

#ifndef _PAGE_PTE

#define _PAGE_PTE 0
#endif
/* At least one of _PAGE_PRIVILEGED or _PAGE_USER must be defined */
#ifndef _PAGE_PRIVILEGED

#define _PAGE_PRIVILEGED 0
#else
#ifndef _PAGE_USER

#define _PAGE_USER 0
#endif
#endif
#ifndef _PAGE_NA

#define _PAGE_NA 0
#endif
#ifndef _PAGE_HUGE

#define _PAGE_HUGE 0
#endif

#ifndef _PMD_PRESENT_MASK

#define _PMD_PRESENT_MASK	_PMD_PRESENT
#endif
#ifndef _PMD_SIZE

#define _PMD_SIZE	0

#define PMD_PAGE_SIZE(pmd)	bad_call_to_PMD_PAGE_SIZE()
#endif
#ifndef _PMD_USER

#define _PMD_USER	0
#endif
#ifndef _PAGE_KERNEL_RO

#define _PAGE_KERNEL_RO		(_PAGE_PRIVILEGED | _PAGE_RO)
#endif
#ifndef _PAGE_KERNEL_ROX

#define _PAGE_KERNEL_ROX	(_PAGE_PRIVILEGED | _PAGE_RO | _PAGE_EXEC)
#endif
#ifndef _PAGE_KERNEL_RW

#define _PAGE_KERNEL_RW		(_PAGE_PRIVILEGED | _PAGE_DIRTY | _PAGE_RW | \
                                 _PAGE_HWWRITE)
#endif
#ifndef _PAGE_KERNEL_RWX

#define _PAGE_KERNEL_RWX	(_PAGE_PRIVILEGED | _PAGE_DIRTY | _PAGE_RW | \
                                 _PAGE_HWWRITE | _PAGE_EXEC)
#endif
#ifndef _PAGE_HPTEFLAGS

#define _PAGE_HPTEFLAGS _PAGE_HASHPTE
#endif
#ifndef _PTE_NONE_MASK

#define _PTE_NONE_MASK	_PAGE_HPTEFLAGS
#endif

/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
 * kernel without large page PMD support
 */
#ifndef __ASSEMBLY__
extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);

/*
 * Don't just check for any non zero bits in __PAGE_USER, since for book3e
 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
 * _PAGE_USER.  Need to explicitly match _PAGE_BAP_UR bit in that case too.
 */



static inline bool pte_user(pte_t pte)
{
	return (pte_val(pte) & (_PAGE_USER | _PAGE_PRIVILEGED)) == _PAGE_USER;
}

Contributors
PersonTokensPropCommitsCommitProp
Michael Ellerman2284.62%150.00%


Christophe Leroy415.38%150.00%


Total26100.00%2100.00%



#endif /* __ASSEMBLY__ */

/* Location of the PFN in the PTE. Most 32-bit platforms use the same
 * as _PAGE_SHIFT here (ie, naturally aligned).
 * Platform who don't just pre-define the value so we don't override it here
 */
#ifndef PTE_RPN_SHIFT

#define PTE_RPN_SHIFT	(PAGE_SHIFT)
#endif

/* The mask covered by the RPN must be a ULL on 32-bit platforms with
 * 64-bit PTEs
 */
#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)

#define PTE_RPN_MASK	(~((1ULL<<PTE_RPN_SHIFT)-1))
#else

#define PTE_RPN_MASK	(~((1UL<<PTE_RPN_SHIFT)-1))
#endif

/* _PAGE_CHG_MASK masks of bits that are to be preserved across
 * pgprot changes
 */

#define _PAGE_CHG_MASK	(PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
                         _PAGE_ACCESSED | _PAGE_SPECIAL)

/* Mask of bits returned by pte_pgprot() */

#define PAGE_PROT_BITS	(_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
                         _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
                         _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | _PAGE_NA | \
                         _PAGE_PRIVILEGED | \
                         _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)

/*
 * We define 2 sets of base prot bits, one for basic pages (ie,
 * cacheable kernel and user pages) and one for non cacheable
 * pages. We always set _PAGE_COHERENT when SMP is enabled or
 * the processor might need it for DMA coherency.
 */

#define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
	defined(CONFIG_PPC_E500MC)

#define _PAGE_BASE	(_PAGE_BASE_NC | _PAGE_COHERENT)
#else

#define _PAGE_BASE	(_PAGE_BASE_NC)
#endif

/* Permission masks used to generate the __P and __S table,
 *
 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
 *
 * Write permissions imply read permissions for now (we could make write-only
 * pages on BookE but we don't bother for now). Execute permission control is
 * possible on platforms that define _PAGE_EXEC
 *
 * Note due to the way vm flags are laid out, the bits are XWR
 */

#define PAGE_NONE	__pgprot(_PAGE_BASE | _PAGE_NA)

#define PAGE_SHARED	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)

#define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
                                 _PAGE_EXEC)

#define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)

#define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
                                 _PAGE_EXEC)

#define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)

#define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
                                 _PAGE_EXEC)


#define __P000	PAGE_NONE

#define __P001	PAGE_READONLY

#define __P010	PAGE_COPY

#define __P011	PAGE_COPY

#define __P100	PAGE_READONLY_X

#define __P101	PAGE_READONLY_X

#define __P110	PAGE_COPY_X

#define __P111	PAGE_COPY_X


#define __S000	PAGE_NONE

#define __S001	PAGE_READONLY

#define __S010	PAGE_SHARED

#define __S011	PAGE_SHARED

#define __S100	PAGE_READONLY_X

#define __S101	PAGE_READONLY_X

#define __S110	PAGE_SHARED_X

#define __S111	PAGE_SHARED_X

/* Permission masks used for kernel mappings */

#define PAGE_KERNEL	__pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)

#define PAGE_KERNEL_NC	__pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
                                 _PAGE_NO_CACHE)

#define PAGE_KERNEL_NCG	__pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
                                 _PAGE_NO_CACHE | _PAGE_GUARDED)

#define PAGE_KERNEL_X	__pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)

#define PAGE_KERNEL_RO	__pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)

#define PAGE_KERNEL_ROX	__pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)

/* Protection used for kernel text. We want the debuggers to be able to
 * set breakpoints anywhere, so don't write protect the kernel text
 * on platforms where such control is possible.
 */
#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
	defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)

#define PAGE_KERNEL_TEXT	PAGE_KERNEL_X
#else

#define PAGE_KERNEL_TEXT	PAGE_KERNEL_ROX
#endif

/* Make modules code happy. We don't set RO yet */

#define PAGE_KERNEL_EXEC	PAGE_KERNEL_X

/* Advertise special mapping type for AGP */

#define PAGE_AGP		(PAGE_KERNEL_NC)

#define HAVE_PAGE_AGP

/* Advertise support for _PAGE_SPECIAL */

#define __HAVE_ARCH_PTE_SPECIAL

#ifndef _PAGE_READ
/* if not defined, we should not find _PAGE_WRITE too */

#define _PAGE_READ 0

#define _PAGE_WRITE _PAGE_RW
#endif

#ifndef H_PAGE_4K_PFN

#define H_PAGE_4K_PFN 0
#endif

Overall Contributors
PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt40673.29%318.75%


Christophe Leroy7914.26%425.00%


Aneesh Kumar K.V325.78%318.75%


Michael Ellerman244.33%212.50%


Scott Wood61.08%16.25%


Stefan Roese50.90%16.25%


Greg Kroah-Hartman10.18%16.25%


Lucas De Marchi10.18%16.25%


Total554100.00%16100.00%


Directory: arch/powerpc/include/asm



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