2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
15 #ifndef _ASM_TILE_PAGE_H
16 #define _ASM_TILE_PAGE_H
18 #include <linux/const.h>
19 #include <hv/hypervisor.h>
20 #include <arch/chip.h>
22 /* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */
23 #if defined(CONFIG_PAGE_SIZE_16KB)
25 #define CTX_PAGE_FLAG HV_CTX_PG_SM_16K
26 #elif defined(CONFIG_PAGE_SIZE_64KB)
28 #define CTX_PAGE_FLAG HV_CTX_PG_SM_64K
30 #define PAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_SMALL
31 #define CTX_PAGE_FLAG 0
33 #define HPAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_LARGE
35 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
36 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
38 #define PAGE_MASK (~(PAGE_SIZE - 1))
39 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
42 * We do define AT_SYSINFO_EHDR to support vDSO,
43 * but don't use the gate mechanism.
45 #define __HAVE_ARCH_GATE_AREA 1
48 * If the Kconfig doesn't specify, set a maximum zone order that
49 * is enough so that we can create huge pages from small pages given
50 * the respective sizes of the two page types. See <linux/mmzone.h>.
52 #ifndef CONFIG_FORCE_MAX_ZONEORDER
53 #define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1)
58 #include <linux/types.h>
59 #include <linux/string.h>
63 static inline void clear_page(void *page)
65 memset(page, 0, PAGE_SIZE);
68 static inline void copy_page(void *to, void *from)
70 memcpy(to, from, PAGE_SIZE);
73 static inline void clear_user_page(void *page, unsigned long vaddr,
79 static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
86 * Hypervisor page tables are made of the same basic structure.
91 typedef HV_PTE pgprot_t;
94 * User L2 page tables are managed as one L2 page table per page,
95 * because we use the page allocator for them. This keeps the allocation
96 * simple, but it's also inefficient, since L2 page tables are much smaller
97 * than pages (currently 2KB vs 64KB). So we should revisit this.
99 typedef struct page *pgtable_t;
101 /* Must be a macro since it is used to create constants. */
102 #define __pgprot(val) hv_pte(val)
104 /* Rarely-used initializers, typically with a "zero" value. */
105 #define __pte(x) hv_pte(x)
106 #define __pgd(x) hv_pte(x)
108 static inline u64 pgprot_val(pgprot_t pgprot)
110 return hv_pte_val(pgprot);
113 static inline u64 pte_val(pte_t pte)
115 return hv_pte_val(pte);
118 static inline u64 pgd_val(pgd_t pgd)
120 return hv_pte_val(pgd);
125 typedef HV_PTE pmd_t;
127 #define __pmd(x) hv_pte(x)
129 static inline u64 pmd_val(pmd_t pmd)
131 return hv_pte_val(pmd);
136 static inline __attribute_const__ int get_order(unsigned long size)
138 return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT);
141 #endif /* !__ASSEMBLY__ */
143 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
145 #define HUGE_MAX_HSTATE 6
147 #ifdef CONFIG_HUGETLB_PAGE
148 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
151 /* Allow overriding how much VA or PA the kernel will use. */
152 #define MAX_PA_WIDTH CHIP_PA_WIDTH()
153 #define MAX_VA_WIDTH CHIP_VA_WIDTH()
155 /* Each memory controller has PAs distinct in their high bits. */
156 #define NR_PA_HIGHBIT_SHIFT (MAX_PA_WIDTH - CHIP_LOG_NUM_MSHIMS())
157 #define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS())
158 #define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT)
159 #define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT))
164 * We reserve the lower half of memory for user-space programs, and the
165 * upper half for system code. We re-map all of physical memory in the
166 * upper half, which takes a quarter of our VA space. Then we have
167 * the vmalloc regions. The supervisor code lives at the highest address,
168 * with the hypervisor above that.
170 * Loadable kernel modules are placed immediately after the static
171 * supervisor code, with each being allocated a 256MB region of
172 * address space, so we don't have to worry about the range of "jal"
173 * and other branch instructions.
175 * For now we keep life simple and just allocate one pmd (4GB) for vmalloc.
176 * Similarly, for now we don't play any struct page mapping games.
179 #if MAX_PA_WIDTH + 2 > MAX_VA_WIDTH
180 # error Too much PA to map with the VA available!
183 #define PAGE_OFFSET (-(_AC(1, UL) << (MAX_VA_WIDTH - 1)))
184 #define KERNEL_HIGH_VADDR _AC(0xfffffff800000000, UL) /* high 32GB */
185 #define FIXADDR_BASE (KERNEL_HIGH_VADDR - 0x400000000) /* 4 GB */
186 #define FIXADDR_TOP (KERNEL_HIGH_VADDR - 0x300000000) /* 4 GB */
187 #define _VMALLOC_START FIXADDR_TOP
188 #define HUGE_VMAP_BASE (KERNEL_HIGH_VADDR - 0x200000000) /* 4 GB */
189 #define MEM_SV_START (KERNEL_HIGH_VADDR - 0x100000000) /* 256 MB */
190 #define MEM_MODULE_START (MEM_SV_START + (256*1024*1024)) /* 256 MB */
191 #define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024))
193 #else /* !__tilegx__ */
196 * A PAGE_OFFSET of 0xC0000000 means that the kernel has
197 * a virtual address space of one gigabyte, which limits the
198 * amount of physical memory you can use to about 768MB.
199 * If you want more physical memory than this then see the CONFIG_HIGHMEM
200 * option in the kernel configuration.
202 * The top 16MB chunk in the table below is unavailable to Linux. Since
203 * the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000
204 * (depending on whether the kernel is at PL2 or Pl1), we map all of the
205 * bottom of RAM at this address with a huge page table entry to minimize
206 * its ITLB footprint (as well as at PAGE_OFFSET). The last architected
207 * requirement is that user interrupt vectors live at 0xfc000000, so we
208 * make that range of memory available to user processes. The remaining
209 * regions are sized as shown; the first four addresses use the PL 1
210 * values, and after that, we show "typical" values, since the actual
211 * addresses depend on kernel #defines.
213 * MEM_HV_START 0xfe000000
214 * MEM_SV_START (kernel code) 0xfd000000
215 * MEM_USER_INTRPT (user vector) 0xfc000000
216 * FIX_KMAP_xxx 0xfa000000 (via NR_CPUS * KM_TYPE_NR)
217 * PKMAP_BASE 0xf9000000 (via LAST_PKMAP)
218 * VMALLOC_START 0xf7000000 (via VMALLOC_RESERVE)
219 * mapped LOWMEM 0xc0000000
222 #define MEM_USER_INTRPT _AC(0xfc000000, UL)
223 #define MEM_SV_START _AC(0xfd000000, UL)
224 #define MEM_HV_START _AC(0xfe000000, UL)
226 #define INTRPT_SIZE 0x4000
228 /* Tolerate page size larger than the architecture interrupt region size. */
229 #if PAGE_SIZE > INTRPT_SIZE
231 #define INTRPT_SIZE PAGE_SIZE
234 #define KERNEL_HIGH_VADDR MEM_USER_INTRPT
235 #define FIXADDR_TOP (KERNEL_HIGH_VADDR - PAGE_SIZE)
237 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
239 /* On 32-bit architectures we mix kernel modules in with other vmaps. */
240 #define MEM_MODULE_START VMALLOC_START
241 #define MEM_MODULE_END VMALLOC_END
243 #endif /* __tilegx__ */
245 #if !defined(__ASSEMBLY__) && !defined(VDSO_BUILD)
247 #ifdef CONFIG_HIGHMEM
249 /* Map kernel virtual addresses to page frames, in HPAGE_SIZE chunks. */
250 extern unsigned long pbase_map[];
251 extern void *vbase_map[];
253 static inline unsigned long kaddr_to_pfn(const volatile void *_kaddr)
255 unsigned long kaddr = (unsigned long)_kaddr;
256 return pbase_map[kaddr >> HPAGE_SHIFT] +
257 ((kaddr & (HPAGE_SIZE - 1)) >> PAGE_SHIFT);
260 static inline void *pfn_to_kaddr(unsigned long pfn)
262 return vbase_map[__pfn_to_highbits(pfn)] + (pfn << PAGE_SHIFT);
265 static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
267 unsigned long pfn = kaddr_to_pfn(kaddr);
268 return ((phys_addr_t)pfn << PAGE_SHIFT) +
269 ((unsigned long)kaddr & (PAGE_SIZE-1));
272 static inline void *phys_to_virt(phys_addr_t paddr)
274 return pfn_to_kaddr(paddr >> PAGE_SHIFT) + (paddr & (PAGE_SIZE-1));
277 /* With HIGHMEM, we pack PAGE_OFFSET through high_memory with all valid VAs. */
278 static inline int virt_addr_valid(const volatile void *kaddr)
280 extern void *high_memory; /* copied from <linux/mm.h> */
281 return ((unsigned long)kaddr >= PAGE_OFFSET && kaddr < high_memory);
284 #else /* !CONFIG_HIGHMEM */
286 static inline unsigned long kaddr_to_pfn(const volatile void *kaddr)
288 return ((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT;
291 static inline void *pfn_to_kaddr(unsigned long pfn)
293 return (void *)((pfn << PAGE_SHIFT) + PAGE_OFFSET);
296 static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
298 return (phys_addr_t)((unsigned long)kaddr - PAGE_OFFSET);
301 static inline void *phys_to_virt(phys_addr_t paddr)
303 return (void *)((unsigned long)paddr + PAGE_OFFSET);
306 /* Check that the given address is within some mapped range of PAs. */
307 #define virt_addr_valid(kaddr) pfn_valid(kaddr_to_pfn(kaddr))
309 #endif /* !CONFIG_HIGHMEM */
311 /* All callers are not consistent in how they call these functions. */
312 #define __pa(kaddr) virt_to_phys((void *)(unsigned long)(kaddr))
313 #define __va(paddr) phys_to_virt((phys_addr_t)(paddr))
315 extern int devmem_is_allowed(unsigned long pagenr);
317 #ifdef CONFIG_FLATMEM
318 static inline int pfn_valid(unsigned long pfn)
320 return pfn < max_mapnr;
324 /* Provide as macros since these require some other headers included. */
325 #define page_to_pa(page) ((phys_addr_t)(page_to_pfn(page)) << PAGE_SHIFT)
326 #define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr)))
327 #define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page))
330 extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
331 extern pte_t *virt_to_kpte(unsigned long kaddr);
333 #endif /* !__ASSEMBLY__ */
335 #define VM_DATA_DEFAULT_FLAGS \
336 (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
338 #include <asm-generic/memory_model.h>
340 #endif /* _ASM_TILE_PAGE_H */