Current File : //usr/src/linux-headers-4.18.0-17/arch/powerpc/include/asm/pte-common.h
/* 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_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
#ifndef __ASSEMBLY__
/*
* 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;
}
#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
#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
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