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Diffstat (limited to 'arch/powerpc/include/asm/pgtable.h')
-rw-r--r-- | arch/powerpc/include/asm/pgtable.h | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h new file mode 100644 index 0000000000..d0ee46de24 --- /dev/null +++ b/arch/powerpc/include/asm/pgtable.h @@ -0,0 +1,201 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_POWERPC_PGTABLE_H +#define _ASM_POWERPC_PGTABLE_H + +#ifndef __ASSEMBLY__ +#include <linux/mmdebug.h> +#include <linux/mmzone.h> +#include <asm/processor.h> /* For TASK_SIZE */ +#include <asm/mmu.h> +#include <asm/page.h> +#include <asm/tlbflush.h> + +struct mm_struct; + +#endif /* !__ASSEMBLY__ */ + +#ifdef CONFIG_PPC_BOOK3S +#include <asm/book3s/pgtable.h> +#else +#include <asm/nohash/pgtable.h> +#endif /* !CONFIG_PPC_BOOK3S */ + +/* + * 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 __ASSEMBLY__ + +void set_ptes(struct mm_struct *mm, unsigned long addr, pte_t *ptep, + pte_t pte, unsigned int nr); +#define set_ptes set_ptes +#define update_mmu_cache(vma, addr, ptep) \ + update_mmu_cache_range(NULL, vma, addr, ptep, 1) + +#ifndef MAX_PTRS_PER_PGD +#define MAX_PTRS_PER_PGD PTRS_PER_PGD +#endif + +/* Keep these as a macros to avoid include dependency mess */ +#define pte_page(x) pfn_to_page(pte_pfn(x)) +#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) + +static inline unsigned long pte_pfn(pte_t pte) +{ + return (pte_val(pte) & PTE_RPN_MASK) >> PTE_RPN_SHIFT; +} + +/* + * Select all bits except the pfn + */ +static inline pgprot_t pte_pgprot(pte_t pte) +{ + unsigned long pte_flags; + + pte_flags = pte_val(pte) & ~PTE_RPN_MASK; + return __pgprot(pte_flags); +} + +#ifndef pmd_page_vaddr +static inline const void *pmd_page_vaddr(pmd_t pmd) +{ + return __va(pmd_val(pmd) & ~PMD_MASKED_BITS); +} +#define pmd_page_vaddr pmd_page_vaddr +#endif +/* + * ZERO_PAGE is a global shared page that is always zero: used + * for zero-mapped memory areas etc.. + */ +extern unsigned long empty_zero_page[]; +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + +extern pgd_t swapper_pg_dir[]; + +extern void paging_init(void); +void poking_init(void); + +extern unsigned long ioremap_bot; +extern const pgprot_t protection_map[16]; + +#ifndef CONFIG_TRANSPARENT_HUGEPAGE +#define pmd_large(pmd) 0 +#endif + +/* can we use this in kvm */ +unsigned long vmalloc_to_phys(void *vmalloc_addr); + +void pgtable_cache_add(unsigned int shift); + +pte_t *early_pte_alloc_kernel(pmd_t *pmdp, unsigned long va); + +#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_PPC32) +void mark_initmem_nx(void); +#else +static inline void mark_initmem_nx(void) { } +#endif + +/* + * When used, PTE_FRAG_NR is defined in subarch pgtable.h + * so we are sure it is included when arriving here. + */ +#ifdef PTE_FRAG_NR +static inline void *pte_frag_get(mm_context_t *ctx) +{ + return ctx->pte_frag; +} + +static inline void pte_frag_set(mm_context_t *ctx, void *p) +{ + ctx->pte_frag = p; +} +#else +#define PTE_FRAG_NR 1 +#define PTE_FRAG_SIZE_SHIFT PAGE_SHIFT +#define PTE_FRAG_SIZE (1UL << PTE_FRAG_SIZE_SHIFT) + +static inline void *pte_frag_get(mm_context_t *ctx) +{ + return NULL; +} + +static inline void pte_frag_set(mm_context_t *ctx, void *p) +{ +} +#endif + +#ifndef pmd_is_leaf +#define pmd_is_leaf pmd_is_leaf +static inline bool pmd_is_leaf(pmd_t pmd) +{ + return false; +} +#endif + +#ifndef pud_is_leaf +#define pud_is_leaf pud_is_leaf +static inline bool pud_is_leaf(pud_t pud) +{ + return false; +} +#endif + +#ifndef p4d_is_leaf +#define p4d_is_leaf p4d_is_leaf +static inline bool p4d_is_leaf(p4d_t p4d) +{ + return false; +} +#endif + +#define pmd_pgtable pmd_pgtable +static inline pgtable_t pmd_pgtable(pmd_t pmd) +{ + return (pgtable_t)pmd_page_vaddr(pmd); +} + +#ifdef CONFIG_PPC64 +int __meminit vmemmap_populated(unsigned long vmemmap_addr, int vmemmap_map_size); +bool altmap_cross_boundary(struct vmem_altmap *altmap, unsigned long start, + unsigned long page_size); +/* + * mm/memory_hotplug.c:mhp_supports_memmap_on_memory goes into details + * some of the restrictions. We don't check for PMD_SIZE because our + * vmemmap allocation code can fallback correctly. The pageblock + * alignment requirement is met using altmap->reserve blocks. + */ +#define arch_supports_memmap_on_memory arch_supports_memmap_on_memory +static inline bool arch_supports_memmap_on_memory(unsigned long vmemmap_size) +{ + if (!radix_enabled()) + return false; + /* + * With 4K page size and 2M PMD_SIZE, we can align + * things better with memory block size value + * starting from 128MB. Hence align things with PMD_SIZE. + */ + if (IS_ENABLED(CONFIG_PPC_4K_PAGES)) + return IS_ALIGNED(vmemmap_size, PMD_SIZE); + return true; +} + +#endif /* CONFIG_PPC64 */ + +#endif /* __ASSEMBLY__ */ + +#endif /* _ASM_POWERPC_PGTABLE_H */ |