188 lines
5.7 KiB
C
188 lines
5.7 KiB
C
|
/* 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_SHARED
|
||
|
|
#define _PAGE_SHARED 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
|
||
|
|
#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 _PAGE_KERNEL_RO
|
||
|
|
#define _PAGE_KERNEL_RO 0
|
||
|
|
#endif
|
||
|
|
#ifndef _PAGE_KERNEL_ROX
|
||
|
|
#define _PAGE_KERNEL_ROX (_PAGE_EXEC)
|
||
|
|
#endif
|
||
|
|
#ifndef _PAGE_KERNEL_RW
|
||
|
|
#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
|
||
|
|
#endif
|
||
|
|
#ifndef _PAGE_KERNEL_RWX
|
||
|
|
#define _PAGE_KERNEL_RWX (_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);
|
||
|
|
#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 convered 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_MAX (1ULL << (64 - PTE_RPN_SHIFT))
|
||
|
|
#define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
|
||
|
|
#else
|
||
|
|
#define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT))
|
||
|
|
#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_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)
|
||
|
|
#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)
|
||
|
|
#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)
|
||
|
|
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
|
||
|
|
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
|
||
|
|
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _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
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
#define pte_user(val) ((val & _PAGE_USER) == _PAGE_USER)
|
||
|
|
|
||
|
|
/* 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
|
||
|
|
|