| /* 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; |
| } |
| #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 |