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 <linux/sizes.h>
10
11 #include <asm/nohash/64/pgtable-4k.h>
12 #include <asm/barrier.h>
13 #include <asm/asm-const.h>
14
15 /*
16 * Size of EA range mapped by our pagetables.
17 */
18 #define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
19 PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
20 #define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
21
22 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
23 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
24
25 /*
26 * Define the address range of the kernel non-linear virtual area
27 */
28 #define KERN_VIRT_START ASM_CONST(0x8000000000000000)
29 #define KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
30
31 /*
32 * The vmalloc space starts at the beginning of that region, and
33 * occupies a quarter of it on Book3E
34 * (we keep a quarter for the virtual memmap)
35 */
36 #define VMALLOC_START KERN_VIRT_START
37 #define VMALLOC_SIZE (KERN_VIRT_SIZE >> 2)
38 #define VMALLOC_END (VMALLOC_START + VMALLOC_SIZE)
39
40 /*
41 * The second half of the kernel virtual space is used for IO mappings,
42 * it's itself carved into the PIO region (ISA and PHB IO space) and
43 * the ioremap space
44 *
45 * ISA_IO_BASE = KERN_IO_START, 64K reserved area
46 * PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
47 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
48 */
49 #define KERN_IO_START (KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
50 #define FULL_IO_SIZE 0x80000000ul
51 #define ISA_IO_BASE (KERN_IO_START)
52 #define ISA_IO_END (KERN_IO_START + 0x10000ul)
53 #define PHB_IO_BASE (ISA_IO_END)
54 #define PHB_IO_END (KERN_IO_START + FULL_IO_SIZE)
55 #define IOREMAP_BASE (PHB_IO_END)
56 #define IOREMAP_START (ioremap_bot)
57 #define IOREMAP_END (KERN_VIRT_START + KERN_VIRT_SIZE - FIXADDR_SIZE)
58 #define FIXADDR_SIZE SZ_32M
59
60
61 /*
62 * Region IDs
63 */
64 #define REGION_SHIFT 60UL
65 #define REGION_MASK (0xfUL << REGION_SHIFT)
66 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
67
68 #define VMALLOC_REGION_ID (REGION_ID(VMALLOC_START))
69 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
70 #define USER_REGION_ID (0UL)
71
72 /*
73 * Defines the address of the vmemap area, in its own region on
74 * after the vmalloc space on Book3E
75 */
76 #define VMEMMAP_BASE VMALLOC_END
77 #define VMEMMAP_END KERN_IO_START
78 #define vmemmap ((struct page *)VMEMMAP_BASE)
79
80
81 /*
82 * Include the PTE bits definitions
83 */
84 #include <asm/nohash/pte-book3e.h>
85
86 #define _PAGE_SAO 0
87
88 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
89
90 /*
91 * _PAGE_CHG_MASK masks of bits that are to be preserved across
92 * pgprot changes.
93 */
94 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
95
96 #define H_PAGE_4K_PFN 0
97
98 #ifndef __ASSEMBLY__
99 /* pte_clear moved to later in this file */
100
pte_mkwrite(pte_t pte)101 static inline pte_t pte_mkwrite(pte_t pte)
102 {
103 return __pte(pte_val(pte) | _PAGE_RW);
104 }
105
pte_mkdirty(pte_t pte)106 static inline pte_t pte_mkdirty(pte_t pte)
107 {
108 return __pte(pte_val(pte) | _PAGE_DIRTY);
109 }
110
pte_mkyoung(pte_t pte)111 static inline pte_t pte_mkyoung(pte_t pte)
112 {
113 return __pte(pte_val(pte) | _PAGE_ACCESSED);
114 }
115
pte_wrprotect(pte_t pte)116 static inline pte_t pte_wrprotect(pte_t pte)
117 {
118 return __pte(pte_val(pte) & ~_PAGE_RW);
119 }
120
121 #define PMD_BAD_BITS (PTE_TABLE_SIZE-1)
122 #define PUD_BAD_BITS (PMD_TABLE_SIZE-1)
123
pmd_set(pmd_t * pmdp,unsigned long val)124 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
125 {
126 *pmdp = __pmd(val);
127 }
128
pmd_clear(pmd_t * pmdp)129 static inline void pmd_clear(pmd_t *pmdp)
130 {
131 *pmdp = __pmd(0);
132 }
133
pmd_pte(pmd_t pmd)134 static inline pte_t pmd_pte(pmd_t pmd)
135 {
136 return __pte(pmd_val(pmd));
137 }
138
139 #define pmd_none(pmd) (!pmd_val(pmd))
140 #define pmd_bad(pmd) (!is_kernel_addr(pmd_val(pmd)) \
141 || (pmd_val(pmd) & PMD_BAD_BITS))
142 #define pmd_present(pmd) (!pmd_none(pmd))
143 #define pmd_page_vaddr(pmd) (pmd_val(pmd) & ~PMD_MASKED_BITS)
144 extern struct page *pmd_page(pmd_t pmd);
145 #define pmd_pfn(pmd) (page_to_pfn(pmd_page(pmd)))
146
pud_set(pud_t * pudp,unsigned long val)147 static inline void pud_set(pud_t *pudp, unsigned long val)
148 {
149 *pudp = __pud(val);
150 }
151
pud_clear(pud_t * pudp)152 static inline void pud_clear(pud_t *pudp)
153 {
154 *pudp = __pud(0);
155 }
156
157 #define pud_none(pud) (!pud_val(pud))
158 #define pud_bad(pud) (!is_kernel_addr(pud_val(pud)) \
159 || (pud_val(pud) & PUD_BAD_BITS))
160 #define pud_present(pud) (pud_val(pud) != 0)
161
pud_pgtable(pud_t pud)162 static inline pmd_t *pud_pgtable(pud_t pud)
163 {
164 return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS);
165 }
166
167 extern struct page *pud_page(pud_t pud);
168
pud_pte(pud_t pud)169 static inline pte_t pud_pte(pud_t pud)
170 {
171 return __pte(pud_val(pud));
172 }
173
pte_pud(pte_t pte)174 static inline pud_t pte_pud(pte_t pte)
175 {
176 return __pud(pte_val(pte));
177 }
178 #define pud_write(pud) pte_write(pud_pte(pud))
179 #define p4d_write(pgd) pte_write(p4d_pte(p4d))
180
p4d_set(p4d_t * p4dp,unsigned long val)181 static inline void p4d_set(p4d_t *p4dp, unsigned long val)
182 {
183 *p4dp = __p4d(val);
184 }
185
186 /* Atomic PTE updates */
pte_update(struct mm_struct * mm,unsigned long addr,pte_t * ptep,unsigned long clr,unsigned long set,int huge)187 static inline unsigned long pte_update(struct mm_struct *mm,
188 unsigned long addr,
189 pte_t *ptep, unsigned long clr,
190 unsigned long set,
191 int huge)
192 {
193 unsigned long old = pte_val(*ptep);
194 *ptep = __pte((old & ~clr) | set);
195
196 /* huge pages use the old page table lock */
197 if (!huge)
198 assert_pte_locked(mm, addr);
199
200 return old;
201 }
202
pte_young(pte_t pte)203 static inline int pte_young(pte_t pte)
204 {
205 return pte_val(pte) & _PAGE_ACCESSED;
206 }
207
__ptep_test_and_clear_young(struct mm_struct * mm,unsigned long addr,pte_t * ptep)208 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
209 unsigned long addr, pte_t *ptep)
210 {
211 unsigned long old;
212
213 if (pte_young(*ptep))
214 return 0;
215 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
216 return (old & _PAGE_ACCESSED) != 0;
217 }
218 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
219 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
220 ({ \
221 int __r; \
222 __r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
223 __r; \
224 })
225
226 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)227 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
228 pte_t *ptep)
229 {
230
231 if ((pte_val(*ptep) & _PAGE_RW) == 0)
232 return;
233
234 pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
235 }
236
237 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
huge_ptep_set_wrprotect(struct mm_struct * mm,unsigned long addr,pte_t * ptep)238 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
239 unsigned long addr, pte_t *ptep)
240 {
241 if ((pte_val(*ptep) & _PAGE_RW) == 0)
242 return;
243
244 pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
245 }
246
247 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
248 #define ptep_clear_flush_young(__vma, __address, __ptep) \
249 ({ \
250 int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
251 __ptep); \
252 __young; \
253 })
254
255 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
ptep_get_and_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)256 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
257 unsigned long addr, pte_t *ptep)
258 {
259 unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
260 return __pte(old);
261 }
262
pte_clear(struct mm_struct * mm,unsigned long addr,pte_t * ptep)263 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
264 pte_t * ptep)
265 {
266 pte_update(mm, addr, ptep, ~0UL, 0, 0);
267 }
268
269
270 /* 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)271 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
272 pte_t *ptep, pte_t entry,
273 unsigned long address,
274 int psize)
275 {
276 unsigned long bits = pte_val(entry) &
277 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
278
279 unsigned long old = pte_val(*ptep);
280 *ptep = __pte(old | bits);
281
282 flush_tlb_page(vma, address);
283 }
284
285 #define pte_ERROR(e) \
286 pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
287 #define pmd_ERROR(e) \
288 pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
289 #define pgd_ERROR(e) \
290 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
291
292 /* Encode and de-code a swap entry */
293 #define MAX_SWAPFILES_CHECK() do { \
294 BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
295 } while (0)
296
297 #define SWP_TYPE_BITS 5
298 #define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \
299 & ((1UL << SWP_TYPE_BITS) - 1))
300 #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT)
301 #define __swp_entry(type, offset) ((swp_entry_t) { \
302 ((type) << _PAGE_BIT_SWAP_TYPE) \
303 | ((offset) << PTE_RPN_SHIFT) })
304
305 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) })
306 #define __swp_entry_to_pte(x) __pte((x).val)
307
308 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
309 void unmap_kernel_page(unsigned long va);
310 extern int __meminit vmemmap_create_mapping(unsigned long start,
311 unsigned long page_size,
312 unsigned long phys);
313 extern void vmemmap_remove_mapping(unsigned long start,
314 unsigned long page_size);
315 void __patch_exception(int exc, unsigned long addr);
316 #define patch_exception(exc, name) do { \
317 extern unsigned int name; \
318 __patch_exception((exc), (unsigned long)&name); \
319 } while (0)
320
321 #endif /* __ASSEMBLY__ */
322
323 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
324