xref: /openbmc/linux/arch/powerpc/include/asm/pgtable.h (revision 4f205687)
1 #ifndef _ASM_POWERPC_PGTABLE_H
2 #define _ASM_POWERPC_PGTABLE_H
3 
4 #ifndef __ASSEMBLY__
5 #include <linux/mmdebug.h>
6 #include <linux/mmzone.h>
7 #include <asm/processor.h>		/* For TASK_SIZE */
8 #include <asm/mmu.h>
9 #include <asm/page.h>
10 
11 struct mm_struct;
12 
13 #endif /* !__ASSEMBLY__ */
14 
15 #ifdef CONFIG_PPC_BOOK3S
16 #include <asm/book3s/pgtable.h>
17 #else
18 #include <asm/nohash/pgtable.h>
19 #endif /* !CONFIG_PPC_BOOK3S */
20 
21 #ifndef __ASSEMBLY__
22 
23 #include <asm/tlbflush.h>
24 
25 /* Keep these as a macros to avoid include dependency mess */
26 #define pte_page(x)		pfn_to_page(pte_pfn(x))
27 #define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
28 
29 /*
30  * ZERO_PAGE is a global shared page that is always zero: used
31  * for zero-mapped memory areas etc..
32  */
33 extern unsigned long empty_zero_page[];
34 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
35 
36 extern pgd_t swapper_pg_dir[];
37 
38 void limit_zone_pfn(enum zone_type zone, unsigned long max_pfn);
39 int dma_pfn_limit_to_zone(u64 pfn_limit);
40 extern void paging_init(void);
41 
42 /*
43  * kern_addr_valid is intended to indicate whether an address is a valid
44  * kernel address.  Most 32-bit archs define it as always true (like this)
45  * but most 64-bit archs actually perform a test.  What should we do here?
46  */
47 #define kern_addr_valid(addr)	(1)
48 
49 #include <asm-generic/pgtable.h>
50 
51 
52 /*
53  * This gets called at the end of handling a page fault, when
54  * the kernel has put a new PTE into the page table for the process.
55  * We use it to ensure coherency between the i-cache and d-cache
56  * for the page which has just been mapped in.
57  * On machines which use an MMU hash table, we use this to put a
58  * corresponding HPTE into the hash table ahead of time, instead of
59  * waiting for the inevitable extra hash-table miss exception.
60  */
61 extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *);
62 
63 extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr,
64 		       unsigned long end, int write,
65 		       struct page **pages, int *nr);
66 #ifndef CONFIG_TRANSPARENT_HUGEPAGE
67 #define pmd_large(pmd)		0
68 #endif
69 pte_t *__find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
70 				   bool *is_thp, unsigned *shift);
71 static inline pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea,
72 					       bool *is_thp, unsigned *shift)
73 {
74 	if (!arch_irqs_disabled()) {
75 		pr_info("%s called with irq enabled\n", __func__);
76 		dump_stack();
77 	}
78 	return __find_linux_pte_or_hugepte(pgdir, ea, is_thp, shift);
79 }
80 
81 unsigned long vmalloc_to_phys(void *vmalloc_addr);
82 
83 #endif /* __ASSEMBLY__ */
84 
85 #endif /* _ASM_POWERPC_PGTABLE_H */
86