1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_64_PGTABLE_H
3 #define _ASM_POWERPC_NOHASH_64_PGTABLE_H
4 /*
5 * This file contains the functions and defines necessary to modify and use
6 * the ppc64 non-hashed page table.
7 */
8
9 #include <asm/nohash/64/pgtable-4k.h>
10 #include <asm/barrier.h>
11 #include <asm/asm-const.h>
12
13 #ifdef CONFIG_PPC_64K_PAGES
14 #error "Page size not supported"
15 #endif
16
17 #define FIRST_USER_ADDRESS 0UL
18
19 /*
20 * Size of EA range mapped by our pagetables.
21 */
22 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
23 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
24 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
25
26 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
27 #define PMD_CACHE_INDEX (PMD_INDEX_SIZE + 1)
28 #else
29 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
30 #endif
31 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
32
33 /*
34 * Define the address range of the kernel non-linear virtual area
35 */
36 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
37 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
38
39 /*
40 * The vmalloc space starts at the beginning of that region, and
41 * occupies a quarter of it on Book3E
42 * (we keep a quarter for the virtual memmap)
43 */
44 #define VMALLOC_START KERN_VIRT_START
45 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
46 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
47
48 /*
49 * The second half of the kernel virtual space is used for IO mappings,
50 * it's itself carved into the PIO region (ISA and PHB IO space) and
51 * the ioremap space
52 *
53 * ISA_IO_BASE = KERN_IO_START, 64K reserved area
54 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
55 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
56 */
57 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
58 #define FULL_IO_SIZE 0x80000000ul
59 #define ISA_IO_BASE (KERN_IO_START)
60 #define ISA_IO_END (KERN_IO_START + 0x10000ul)
61 #define PHB_IO_BASE (ISA_IO_END)
62 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
63 #define IOREMAP_BASE (PHB_IO_END)
64 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE)
65
66
67 /*
68 * Region IDs
69 */
70 #define REGION_SHIFT 60UL
71 #define REGION_MASK (0xfUL << REGION_SHIFT)
72 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
73
74 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
75 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
76 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
77 #define USER_REGION_ID (0UL)
78
79 /*
80 * Defines the address of the vmemap area, in its own region on
81 * after the vmalloc space on Book3E
82 */
83 #define VMEMMAP_BASE VMALLOC_END
84 #define VMEMMAP_END KERN_IO_START
85 #define vmemmap ((struct page *)VMEMMAP_BASE)
86
87
88 /*
89 * Include the PTE bits definitions
90 */
91 #include <asm/nohash/pte-book3e.h>
92 #include <asm/pte-common.h>
93
94 #ifndef __ASSEMBLY__
95 /* pte_clear moved to later in this file */
96
97 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
98 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
99
pmd_set(pmd_t * pmdp,unsigned long val)100 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
101 {
102 *pmdp = __pmd(val);
103 }
104
pmd_clear(pmd_t * pmdp)105 static inline void pmd_clear(pmd_t *pmdp)
106 {
107 *pmdp = __pmd(0);
108 }
109
pmd_pte(pmd_t pmd)110 static inline pte_t pmd_pte(pmd_t pmd)
111 {
112 return __pte(pmd_val(pmd));
113 }
114
115 #define pmd_none(pmd) (!pmd_val(pmd))
116 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
117 || (pmd_val(pmd) & PMD_BAD_BITS))
118 #define pmd_present(pmd) (!pmd_none(pmd))
119 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
120 extern struct page *pmd_page(pmd_t pmd);
121
pud_set(pud_t * pudp,unsigned long val)122 static inline void pud_set(pud_t *pudp, unsigned long val)
123 {
124 *pudp = __pud(val);
125 }
126
pud_clear(pud_t * pudp)127 static inline void pud_clear(pud_t *pudp)
128 {
129 *pudp = __pud(0);
130 }
131
132 #define pud_none(pud) (!pud_val(pud))
133 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
134 || (pud_val(pud) & PUD_BAD_BITS))
135 #define pud_present(pud) (pud_val(pud) != 0)
136 #define pud_page_vaddr(pud) (pud_val(pud) & ~PUD_MASKED_BITS)
137
138 extern struct page *pud_page(pud_t pud);
139
pud_pte(pud_t pud)140 static inline pte_t pud_pte(pud_t pud)
141 {
142 return __pte(pud_val(pud));
143 }
144
pte_pud(pte_t pte)145 static inline pud_t pte_pud(pte_t pte)
146 {
147 return __pud(pte_val(pte));
148 }
149 #define pud_write(pud) pte_write(pud_pte(pud))
150 #define pgd_write(pgd) pte_write(pgd_pte(pgd))
151
pgd_set(pgd_t * pgdp,unsigned long val)152 static inline void pgd_set(pgd_t *pgdp, unsigned long val)
153 {
154 *pgdp = __pgd(val);
155 }
156
157 /*
158 * Find an entry in a page-table-directory. We combine the address region
159 * (the high order N bits) and the pgd portion of the address.
160 */
161 #define pgd_index(address) (((address) >> (PGDIR_SHIFT)) & (PTRS_PER_PGD - 1))
162
163 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
164
165 #define pmd_offset(pudp,addr) \
166 (((pmd_t *) pud_page_vaddr(*(pudp))) + (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1)))
167
168 #define pte_offset_kernel(dir,addr) \
169 (((pte_t *) pmd_page_vaddr(*(dir))) + (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
170
171 #define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
172 #define pte_unmap(pte) do { } while(0)
173
174 /* to find an entry in a kernel page-table-directory */
175 /* This now only contains the vmalloc pages */
176 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
177
178 /* Atomic PTE updates */
pte_update(struct mm_struct * mm,unsigned long addr,pte_t * ptep,unsigned long clr,unsigned long set,int huge)179 static inline unsigned long pte_update(struct mm_struct *mm,
180 unsigned long addr,
181 pte_t *ptep, unsigned long clr,
182 unsigned long set,
183 int huge)
184 {
185 #ifdef PTE_ATOMIC_UPDATES
186 unsigned long old, tmp;
187
188 __asm__ __volatile__(
189 "1: ldarx %0,0,%3 # pte_update\n\
190 andc %1,%0,%4 \n\
191 or %1,%1,%6\n\
192 stdcx. %1,0,%3 \n\
193 bne- 1b"
194 : "=&r" (old), "=&r" (tmp), "=m" (*ptep)
195 : "r" (ptep), "r" (clr), "m" (*ptep), "r" (set)
196 : "cc" );
197 #else
198 unsigned long old = pte_val(*ptep);
199 *ptep = __pte((old & ~clr) | set);
200 #endif
201 /* huge pages use the old page table lock */
202 if (!huge)
203 assert_pte_locked(mm, addr);
204
205 return old;
206 }
207
pte_young(pte_t pte)208 static inline int pte_young(pte_t pte)
209 {
210 return pte_val(pte) & _PAGE_ACCESSED;
211 }
212
__ptep_test_and_clear_young(struct mm_struct * mm,unsigned long addr,pte_t * ptep)213 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
214 unsigned long addr, pte_t *ptep)
215 {
216 unsigned long old;
217
218 if (pte_young(*ptep))
219 return 0;
220 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
221 return (old & _PAGE_ACCESSED) != 0;
222 }
223 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
224 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
225 ({ \
226 int __r; \
227 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
228 __r; \
229 })
230
231 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)232 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
233 pte_t *ptep)
234 {
235
236 if ((pte_val(*ptep) & _PAGE_RW) == 0)
237 return;
238
239 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
240 }
241
huge_ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)242 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
243 unsigned long addr, pte_t *ptep)
244 {
245 if ((pte_val(*ptep) & _PAGE_RW) == 0)
246 return;
247
248 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
249 }
250
251 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
252 #define ptep_clear_flush_young(__vma, __address, __ptep) \
253 ({ \
254 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
255 __ptep); \
256 __young; \
257 })
258
259 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)260 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
261 unsigned long addr, pte_t *ptep)
262 {
263 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
264 return __pte(old);
265 }
266
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)267 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
268 pte_t * ptep)
269 {
270 pte_update(mm, addr, ptep, ~0UL, 0, 0);
271 }
272
273
274 /* Set the dirty and/or accessed bits atomically in a linux PTE */
__ptep_set_access_flags(struct vm_area_struct * vma,pte_t * ptep,pte_t entry,unsigned long address,int psize)275 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
276 pte_t *ptep, pte_t entry,
277 unsigned long address,
278 int psize)
279 {
280 unsigned long bits = pte_val(entry) &
281 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
282
283 #ifdef PTE_ATOMIC_UPDATES
284 unsigned long old, tmp;
285
286 __asm__ __volatile__(
287 "1: ldarx %0,0,%4\n\
288 or %0,%3,%0\n\
289 stdcx. %0,0,%4\n\
290 bne- 1b"
291 :"=&r" (old), "=&r" (tmp), "=m" (*ptep)
292 :"r" (bits), "r" (ptep), "m" (*ptep)
293 :"cc");
294 #else
295 unsigned long old = pte_val(*ptep);
296 *ptep = __pte(old | bits);
297 #endif
298
299 flush_tlb_page(vma, address);
300 }
301
302 #define __HAVE_ARCH_PTE_SAME
303 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
304
305 #define pte_ERROR(e) \
306 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
307 #define pmd_ERROR(e) \
308 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
309 #define pgd_ERROR(e) \
310 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
311
312 /* Encode and de-code a swap entry */
313 #define MAX_SWAPFILES_CHECK() do { \
314 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
315 } while (0)
316 /*
317 * on pte we don't need handle RADIX_TREE_EXCEPTIONAL_SHIFT;
318 */
319 #define SWP_TYPE_BITS 5
320 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
321 & ((1UL << SWP_TYPE_BITS) - 1))
322 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
323 #define __swp_entry(type, offset) ((swp_entry_t) { \
324 ((type) << _PAGE_BIT_SWAP_TYPE) \
325 | ((offset) << PTE_RPN_SHIFT) })
326
327 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
328 #define __swp_entry_to_pte(x) __pte((x).val)
329
330 extern int map_kernel_page(unsigned long ea, unsigned long pa,
331 unsigned long flags);
332 extern int __meminit vmemmap_create_mapping(unsigned long start,
333 unsigned long page_size,
334 unsigned long phys);
335 extern void vmemmap_remove_mapping(unsigned long start,
336 unsigned long page_size);
337 #endif /* __ASSEMBLY__ */
338
339 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
340
