4 #include <asm/asm-compat.h>
6 /* PAGE_SHIFT determines the page size */
8 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT)
11 * Subtle: this is an int (not an unsigned long) and so it
12 * gets extended to 64 bits the way want (i.e. with 1s). -- paulus
14 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
18 /* This must match what is in arch/ppc/Makefile */
19 #define PAGE_OFFSET CONFIG_KERNEL_START
20 #define KERNELBASE PAGE_OFFSET
25 * The basic type of a PTE - 64 bits for those CPUs with > 32 bit
26 * physical addressing. For now this just the IBM PPC440.
28 #ifdef CONFIG_PTE_64BIT
29 typedef unsigned long long pte_basic_t;
30 #define PTE_SHIFT (PAGE_SHIFT - 3) /* 512 ptes per page */
31 #define PTE_FMT "%16Lx"
33 typedef unsigned long pte_basic_t;
34 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */
35 #define PTE_FMT "%.8lx"
38 /* align addr on a size boundary - adjust address up/down if needed */
39 #define _ALIGN_UP(addr,size) (((addr)+((size)-1))&(~((size)-1)))
40 #define _ALIGN_DOWN(addr,size) ((addr)&(~((size)-1)))
42 /* align addr on a size boundary - adjust address up if needed */
43 #define _ALIGN(addr,size) _ALIGN_UP(addr,size)
45 /* to align the pointer to the (next) page boundary */
46 #define PAGE_ALIGN(addr) _ALIGN(addr, PAGE_SIZE)
49 #undef STRICT_MM_TYPECHECKS
51 #ifdef STRICT_MM_TYPECHECKS
53 * These are used to make use of C type-checking..
55 typedef struct { pte_basic_t pte; } pte_t;
56 typedef struct { unsigned long pmd; } pmd_t;
57 typedef struct { unsigned long pgd; } pgd_t;
58 typedef struct { unsigned long pgprot; } pgprot_t;
60 #define pte_val(x) ((x).pte)
61 #define pmd_val(x) ((x).pmd)
62 #define pgd_val(x) ((x).pgd)
63 #define pgprot_val(x) ((x).pgprot)
65 #define __pte(x) ((pte_t) { (x) } )
66 #define __pmd(x) ((pmd_t) { (x) } )
67 #define __pgd(x) ((pgd_t) { (x) } )
68 #define __pgprot(x) ((pgprot_t) { (x) } )
72 * .. while these make it easier on the compiler
74 typedef pte_basic_t pte_t;
75 typedef unsigned long pmd_t;
76 typedef unsigned long pgd_t;
77 typedef unsigned long pgprot_t;
79 #define pte_val(x) (x)
80 #define pmd_val(x) (x)
81 #define pgd_val(x) (x)
82 #define pgprot_val(x) (x)
87 #define __pgprot(x) (x)
92 extern void clear_pages(void *page, int order);
93 static inline void clear_page(void *page) { clear_pages(page, 0); }
94 extern void copy_page(void *to, void *from);
95 extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg);
96 extern void copy_user_page(void *to, void *from, unsigned long vaddr,
100 #define PPC_MEMSTART 0
101 #define PPC_PGSTART 0
102 #define PPC_MEMOFFSET PAGE_OFFSET
104 extern unsigned long ppc_memstart;
105 extern unsigned long ppc_pgstart;
106 extern unsigned long ppc_memoffset;
107 #define PPC_MEMSTART ppc_memstart
108 #define PPC_PGSTART ppc_pgstart
109 #define PPC_MEMOFFSET ppc_memoffset
112 #if defined(CONFIG_APUS) && !defined(MODULE)
113 /* map phys->virtual and virtual->phys for RAM pages */
114 static inline unsigned long ___pa(unsigned long v)
117 asm volatile ("1: addis %0, %1, %2;"
118 ".section \".vtop_fixup\",\"aw\";"
123 : "b" (v), "K" (((-PAGE_OFFSET) >> 16) & 0xffff));
127 static inline void* ___va(unsigned long p)
130 asm volatile ("1: addis %0, %1, %2;"
131 ".section \".ptov_fixup\",\"aw\";"
136 : "b" (p), "K" (((PAGE_OFFSET) >> 16) & 0xffff));
141 #define ___pa(vaddr) ((vaddr)-PPC_MEMOFFSET)
142 #define ___va(paddr) ((paddr)+PPC_MEMOFFSET)
145 extern int page_is_ram(unsigned long pfn);
147 #define __pa(x) ___pa((unsigned long)(x))
148 #define __va(x) ((void *)(___va((unsigned long)(x))))
150 #define ARCH_PFN_OFFSET (PPC_PGSTART)
151 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
152 #define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT)
154 #define pfn_valid(pfn) (((pfn) - PPC_PGSTART) < max_mapnr)
155 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
157 /* Pure 2^n version of get_order */
158 extern __inline__ int get_order(unsigned long size)
162 size = (size-1) >> PAGE_SHIFT;
163 asm ("cntlzw %0,%1" : "=r" (lz) : "r" (size));
167 #endif /* __ASSEMBLY__ */
169 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
170 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
172 /* We do define AT_SYSINFO_EHDR but don't use the gate mecanism */
173 #define __HAVE_ARCH_GATE_AREA 1
175 #include <asm-generic/memory_model.h>
176 #endif /* __KERNEL__ */
177 #endif /* _PPC_PAGE_H */