xref: /linux/arch/powerpc/include/asm/page_32.h (revision 0d456bad36d42d16022be045c8a53ddbb59ee478)
1 #ifndef _ASM_POWERPC_PAGE_32_H
2 #define _ASM_POWERPC_PAGE_32_H
3 
4 #if defined(CONFIG_PHYSICAL_ALIGN) && (CONFIG_PHYSICAL_START != 0)
5 #if (CONFIG_PHYSICAL_START % CONFIG_PHYSICAL_ALIGN) != 0
6 #error "CONFIG_PHYSICAL_START must be a multiple of CONFIG_PHYSICAL_ALIGN"
7 #endif
8 #endif
9 
10 #define VM_DATA_DEFAULT_FLAGS	VM_DATA_DEFAULT_FLAGS32
11 
12 #ifdef CONFIG_NOT_COHERENT_CACHE
13 #define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
14 #endif
15 
16 #ifdef CONFIG_PTE_64BIT
17 #define PTE_FLAGS_OFFSET	4	/* offset of PTE flags, in bytes */
18 #else
19 #define PTE_FLAGS_OFFSET	0
20 #endif
21 
22 #ifdef CONFIG_PPC_256K_PAGES
23 #define PTE_SHIFT	(PAGE_SHIFT - PTE_T_LOG2 - 2)	/* 1/4 of a page */
24 #else
25 #define PTE_SHIFT	(PAGE_SHIFT - PTE_T_LOG2)	/* full page */
26 #endif
27 
28 #ifndef __ASSEMBLY__
29 /*
30  * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
31  * physical addressing.
32  */
33 #ifdef CONFIG_PTE_64BIT
34 typedef unsigned long long pte_basic_t;
35 #else
36 typedef unsigned long pte_basic_t;
37 #endif
38 
39 struct page;
40 extern void clear_pages(void *page, int order);
41 static inline void clear_page(void *page) { clear_pages(page, 0); }
42 extern void copy_page(void *to, void *from);
43 
44 #include <asm-generic/getorder.h>
45 
46 #define PGD_T_LOG2	(__builtin_ffs(sizeof(pgd_t)) - 1)
47 #define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)
48 
49 #endif /* __ASSEMBLY__ */
50 
51 #endif /* _ASM_POWERPC_PAGE_32_H */
52