tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
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.
7 *
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
12 * more details.
13 */
14
15#ifndef _ASM_TILE_PAGE_H
16#define _ASM_TILE_PAGE_H
17
18#include <linux/const.h>
19#include <hv/hypervisor.h>
20#include <arch/chip.h>
21
22/* PAGE_SHIFT and HPAGE_SHIFT determine the page sizes. */
23#if defined(CONFIG_PAGE_SIZE_16KB)
24#define PAGE_SHIFT 14
25#define CTX_PAGE_FLAG HV_CTX_PG_SM_16K
26#elif defined(CONFIG_PAGE_SIZE_64KB)
27#define PAGE_SHIFT 16
28#define CTX_PAGE_FLAG HV_CTX_PG_SM_64K
29#else
30#define PAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_SMALL
31#define CTX_PAGE_FLAG 0
32#endif
33#define HPAGE_SHIFT HV_LOG2_DEFAULT_PAGE_SIZE_LARGE
34
35#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
36#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
37
38#define PAGE_MASK (~(PAGE_SIZE - 1))
39#define HPAGE_MASK (~(HPAGE_SIZE - 1))
40
41/*
42 * If the Kconfig doesn't specify, set a maximum zone order that
43 * is enough so that we can create huge pages from small pages given
44 * the respective sizes of the two page types. See <linux/mmzone.h>.
45 */
46#ifndef CONFIG_FORCE_MAX_ZONEORDER
47#define CONFIG_FORCE_MAX_ZONEORDER (HPAGE_SHIFT - PAGE_SHIFT + 1)
48#endif
49
50#ifndef __ASSEMBLY__
51
52#include <linux/types.h>
53#include <linux/string.h>
54
55struct page;
56
57static inline void clear_page(void *page)
58{
59 memset(page, 0, PAGE_SIZE);
60}
61
62static inline void copy_page(void *to, void *from)
63{
64 memcpy(to, from, PAGE_SIZE);
65}
66
67static inline void clear_user_page(void *page, unsigned long vaddr,
68 struct page *pg)
69{
70 clear_page(page);
71}
72
73static inline void copy_user_page(void *to, void *from, unsigned long vaddr,
74 struct page *topage)
75{
76 copy_page(to, from);
77}
78
79/*
80 * Hypervisor page tables are made of the same basic structure.
81 */
82
83typedef HV_PTE pte_t;
84typedef HV_PTE pgd_t;
85typedef HV_PTE pgprot_t;
86
87/*
88 * User L2 page tables are managed as one L2 page table per page,
89 * because we use the page allocator for them. This keeps the allocation
90 * simple, but it's also inefficient, since L2 page tables are much smaller
91 * than pages (currently 2KB vs 64KB). So we should revisit this.
92 */
93typedef struct page *pgtable_t;
94
95/* Must be a macro since it is used to create constants. */
96#define __pgprot(val) hv_pte(val)
97
98/* Rarely-used initializers, typically with a "zero" value. */
99#define __pte(x) hv_pte(x)
100#define __pgd(x) hv_pte(x)
101
102static inline u64 pgprot_val(pgprot_t pgprot)
103{
104 return hv_pte_val(pgprot);
105}
106
107static inline u64 pte_val(pte_t pte)
108{
109 return hv_pte_val(pte);
110}
111
112static inline u64 pgd_val(pgd_t pgd)
113{
114 return hv_pte_val(pgd);
115}
116
117#ifdef __tilegx__
118
119typedef HV_PTE pmd_t;
120
121#define __pmd(x) hv_pte(x)
122
123static inline u64 pmd_val(pmd_t pmd)
124{
125 return hv_pte_val(pmd);
126}
127
128#endif
129
130static inline __attribute_const__ int get_order(unsigned long size)
131{
132 return BITS_PER_LONG - __builtin_clzl((size - 1) >> PAGE_SHIFT);
133}
134
135#endif /* !__ASSEMBLY__ */
136
137#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
138
139#define HUGE_MAX_HSTATE 6
140
141#ifdef CONFIG_HUGETLB_PAGE
142#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
143#endif
144
145/* Each memory controller has PAs distinct in their high bits. */
146#define NR_PA_HIGHBIT_SHIFT (CHIP_PA_WIDTH() - CHIP_LOG_NUM_MSHIMS())
147#define NR_PA_HIGHBIT_VALUES (1 << CHIP_LOG_NUM_MSHIMS())
148#define __pa_to_highbits(pa) ((phys_addr_t)(pa) >> NR_PA_HIGHBIT_SHIFT)
149#define __pfn_to_highbits(pfn) ((pfn) >> (NR_PA_HIGHBIT_SHIFT - PAGE_SHIFT))
150
151#ifdef __tilegx__
152
153/*
154 * We reserve the lower half of memory for user-space programs, and the
155 * upper half for system code. We re-map all of physical memory in the
156 * upper half, which takes a quarter of our VA space. Then we have
157 * the vmalloc regions. The supervisor code lives at 0xfffffff700000000,
158 * with the hypervisor above that.
159 *
160 * Loadable kernel modules are placed immediately after the static
161 * supervisor code, with each being allocated a 256MB region of
162 * address space, so we don't have to worry about the range of "jal"
163 * and other branch instructions.
164 *
165 * For now we keep life simple and just allocate one pmd (4GB) for vmalloc.
166 * Similarly, for now we don't play any struct page mapping games.
167 */
168
169#if CHIP_PA_WIDTH() + 2 > CHIP_VA_WIDTH()
170# error Too much PA to map with the VA available!
171#endif
172#define HALF_VA_SPACE (_AC(1, UL) << (CHIP_VA_WIDTH() - 1))
173
174#define MEM_LOW_END (HALF_VA_SPACE - 1) /* low half */
175#define MEM_HIGH_START (-HALF_VA_SPACE) /* high half */
176#define PAGE_OFFSET MEM_HIGH_START
177#define FIXADDR_BASE _AC(0xfffffff400000000, UL) /* 4 GB */
178#define FIXADDR_TOP _AC(0xfffffff500000000, UL) /* 4 GB */
179#define _VMALLOC_START FIXADDR_TOP
180#define HUGE_VMAP_BASE _AC(0xfffffff600000000, UL) /* 4 GB */
181#define MEM_SV_START _AC(0xfffffff700000000, UL) /* 256 MB */
182#define MEM_SV_INTRPT MEM_SV_START
183#define MEM_MODULE_START _AC(0xfffffff710000000, UL) /* 256 MB */
184#define MEM_MODULE_END (MEM_MODULE_START + (256*1024*1024))
185#define MEM_HV_START _AC(0xfffffff800000000, UL) /* 32 GB */
186
187/* Highest DTLB address we will use */
188#define KERNEL_HIGH_VADDR MEM_SV_START
189
190#else /* !__tilegx__ */
191
192/*
193 * A PAGE_OFFSET of 0xC0000000 means that the kernel has
194 * a virtual address space of one gigabyte, which limits the
195 * amount of physical memory you can use to about 768MB.
196 * If you want more physical memory than this then see the CONFIG_HIGHMEM
197 * option in the kernel configuration.
198 *
199 * The top 16MB chunk in the table below is unavailable to Linux. Since
200 * the kernel interrupt vectors must live at ether 0xfe000000 or 0xfd000000
201 * (depending on whether the kernel is at PL2 or Pl1), we map all of the
202 * bottom of RAM at this address with a huge page table entry to minimize
203 * its ITLB footprint (as well as at PAGE_OFFSET). The last architected
204 * requirement is that user interrupt vectors live at 0xfc000000, so we
205 * make that range of memory available to user processes. The remaining
206 * regions are sized as shown; the first four addresses use the PL 1
207 * values, and after that, we show "typical" values, since the actual
208 * addresses depend on kernel #defines.
209 *
210 * MEM_HV_INTRPT 0xfe000000
211 * MEM_SV_INTRPT (kernel code) 0xfd000000
212 * MEM_USER_INTRPT (user vector) 0xfc000000
213 * FIX_KMAP_xxx 0xf8000000 (via NR_CPUS * KM_TYPE_NR)
214 * PKMAP_BASE 0xf7000000 (via LAST_PKMAP)
215 * HUGE_VMAP 0xf3000000 (via CONFIG_NR_HUGE_VMAPS)
216 * VMALLOC_START 0xf0000000 (via __VMALLOC_RESERVE)
217 * mapped LOWMEM 0xc0000000
218 */
219
220#define MEM_USER_INTRPT _AC(0xfc000000, UL)
221#if CONFIG_KERNEL_PL == 1
222#define MEM_SV_INTRPT _AC(0xfd000000, UL)
223#define MEM_HV_INTRPT _AC(0xfe000000, UL)
224#else
225#define MEM_GUEST_INTRPT _AC(0xfd000000, UL)
226#define MEM_SV_INTRPT _AC(0xfe000000, UL)
227#define MEM_HV_INTRPT _AC(0xff000000, UL)
228#endif
229
230#define INTRPT_SIZE 0x4000
231
232/* Tolerate page size larger than the architecture interrupt region size. */
233#if PAGE_SIZE > INTRPT_SIZE
234#undef INTRPT_SIZE
235#define INTRPT_SIZE PAGE_SIZE
236#endif
237
238#define KERNEL_HIGH_VADDR MEM_USER_INTRPT
239#define FIXADDR_TOP (KERNEL_HIGH_VADDR - PAGE_SIZE)
240
241#define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
242
243/* On 32-bit architectures we mix kernel modules in with other vmaps. */
244#define MEM_MODULE_START VMALLOC_START
245#define MEM_MODULE_END VMALLOC_END
246
247#endif /* __tilegx__ */
248
249#ifndef __ASSEMBLY__
250
251#ifdef CONFIG_HIGHMEM
252
253/* Map kernel virtual addresses to page frames, in HPAGE_SIZE chunks. */
254extern unsigned long pbase_map[];
255extern void *vbase_map[];
256
257static inline unsigned long kaddr_to_pfn(const volatile void *_kaddr)
258{
259 unsigned long kaddr = (unsigned long)_kaddr;
260 return pbase_map[kaddr >> HPAGE_SHIFT] +
261 ((kaddr & (HPAGE_SIZE - 1)) >> PAGE_SHIFT);
262}
263
264static inline void *pfn_to_kaddr(unsigned long pfn)
265{
266 return vbase_map[__pfn_to_highbits(pfn)] + (pfn << PAGE_SHIFT);
267}
268
269static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
270{
271 unsigned long pfn = kaddr_to_pfn(kaddr);
272 return ((phys_addr_t)pfn << PAGE_SHIFT) +
273 ((unsigned long)kaddr & (PAGE_SIZE-1));
274}
275
276static inline void *phys_to_virt(phys_addr_t paddr)
277{
278 return pfn_to_kaddr(paddr >> PAGE_SHIFT) + (paddr & (PAGE_SIZE-1));
279}
280
281/* With HIGHMEM, we pack PAGE_OFFSET through high_memory with all valid VAs. */
282static inline int virt_addr_valid(const volatile void *kaddr)
283{
284 extern void *high_memory; /* copied from <linux/mm.h> */
285 return ((unsigned long)kaddr >= PAGE_OFFSET && kaddr < high_memory);
286}
287
288#else /* !CONFIG_HIGHMEM */
289
290static inline unsigned long kaddr_to_pfn(const volatile void *kaddr)
291{
292 return ((unsigned long)kaddr - PAGE_OFFSET) >> PAGE_SHIFT;
293}
294
295static inline void *pfn_to_kaddr(unsigned long pfn)
296{
297 return (void *)((pfn << PAGE_SHIFT) + PAGE_OFFSET);
298}
299
300static inline phys_addr_t virt_to_phys(const volatile void *kaddr)
301{
302 return (phys_addr_t)((unsigned long)kaddr - PAGE_OFFSET);
303}
304
305static inline void *phys_to_virt(phys_addr_t paddr)
306{
307 return (void *)((unsigned long)paddr + PAGE_OFFSET);
308}
309
310/* Check that the given address is within some mapped range of PAs. */
311#define virt_addr_valid(kaddr) pfn_valid(kaddr_to_pfn(kaddr))
312
313#endif /* !CONFIG_HIGHMEM */
314
315/* All callers are not consistent in how they call these functions. */
316#define __pa(kaddr) virt_to_phys((void *)(unsigned long)(kaddr))
317#define __va(paddr) phys_to_virt((phys_addr_t)(paddr))
318
319extern int devmem_is_allowed(unsigned long pagenr);
320
321#ifdef CONFIG_FLATMEM
322static inline int pfn_valid(unsigned long pfn)
323{
324 return pfn < max_mapnr;
325}
326#endif
327
328/* Provide as macros since these require some other headers included. */
329#define page_to_pa(page) ((phys_addr_t)(page_to_pfn(page)) << PAGE_SHIFT)
330#define virt_to_page(kaddr) pfn_to_page(kaddr_to_pfn((void *)(kaddr)))
331#define page_to_virt(page) pfn_to_kaddr(page_to_pfn(page))
332
333struct mm_struct;
334extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr);
335
336#endif /* !__ASSEMBLY__ */
337
338#define VM_DATA_DEFAULT_FLAGS \
339 (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
340
341#include <asm-generic/memory_model.h>
342
343#endif /* _ASM_TILE_PAGE_H */