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 
101 static inline pte_t pte_mkwrite(pte_t pte)
102 {
103 	return __pte(pte_val(pte) | _PAGE_RW);
104 }
105 
106 static inline pte_t pte_mkdirty(pte_t pte)
107 {
108 	return __pte(pte_val(pte) | _PAGE_DIRTY);
109 }
110 
111 static inline pte_t pte_mkyoung(pte_t pte)
112 {
113 	return __pte(pte_val(pte) | _PAGE_ACCESSED);
114 }
115 
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 
124 static inline void pmd_set(pmd_t *pmdp, unsigned long val)
125 {
126 	*pmdp = __pmd(val);
127 }
128 
129 static inline void pmd_clear(pmd_t *pmdp)
130 {
131 	*pmdp = __pmd(0);
132 }
133 
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 
146 static inline void pud_set(pud_t *pudp, unsigned long val)
147 {
148 	*pudp = __pud(val);
149 }
150 
151 static inline void pud_clear(pud_t *pudp)
152 {
153 	*pudp = __pud(0);
154 }
155 
156 #define pud_none(pud)		(!pud_val(pud))
157 #define	pud_bad(pud)		(!is_kernel_addr(pud_val(pud)) \
158 				 || (pud_val(pud) & PUD_BAD_BITS))
159 #define pud_present(pud)	(pud_val(pud) != 0)
160 
161 static inline pmd_t *pud_pgtable(pud_t pud)
162 {
163 	return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS);
164 }
165 
166 extern struct page *pud_page(pud_t pud);
167 
168 static inline pte_t pud_pte(pud_t pud)
169 {
170 	return __pte(pud_val(pud));
171 }
172 
173 static inline pud_t pte_pud(pte_t pte)
174 {
175 	return __pud(pte_val(pte));
176 }
177 #define pud_write(pud)		pte_write(pud_pte(pud))
178 #define p4d_write(pgd)		pte_write(p4d_pte(p4d))
179 
180 static inline void p4d_set(p4d_t *p4dp, unsigned long val)
181 {
182 	*p4dp = __p4d(val);
183 }
184 
185 /* Atomic PTE updates */
186 static inline unsigned long pte_update(struct mm_struct *mm,
187 				       unsigned long addr,
188 				       pte_t *ptep, unsigned long clr,
189 				       unsigned long set,
190 				       int huge)
191 {
192 	unsigned long old = pte_val(*ptep);
193 	*ptep = __pte((old & ~clr) | set);
194 
195 	/* huge pages use the old page table lock */
196 	if (!huge)
197 		assert_pte_locked(mm, addr);
198 
199 	return old;
200 }
201 
202 static inline int pte_young(pte_t pte)
203 {
204 	return pte_val(pte) & _PAGE_ACCESSED;
205 }
206 
207 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
208 					      unsigned long addr, pte_t *ptep)
209 {
210 	unsigned long old;
211 
212 	if (pte_young(*ptep))
213 		return 0;
214 	old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
215 	return (old & _PAGE_ACCESSED) != 0;
216 }
217 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
218 #define ptep_test_and_clear_young(__vma, __addr, __ptep)		   \
219 ({									   \
220 	int __r;							   \
221 	__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
222 	__r;								   \
223 })
224 
225 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
226 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
227 				      pte_t *ptep)
228 {
229 
230 	if ((pte_val(*ptep) & _PAGE_RW) == 0)
231 		return;
232 
233 	pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
234 }
235 
236 #define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
237 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
238 					   unsigned long addr, pte_t *ptep)
239 {
240 	if ((pte_val(*ptep) & _PAGE_RW) == 0)
241 		return;
242 
243 	pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
244 }
245 
246 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
247 #define ptep_clear_flush_young(__vma, __address, __ptep)		\
248 ({									\
249 	int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
250 						  __ptep);		\
251 	__young;							\
252 })
253 
254 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
255 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
256 				       unsigned long addr, pte_t *ptep)
257 {
258 	unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
259 	return __pte(old);
260 }
261 
262 static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
263 			     pte_t * ptep)
264 {
265 	pte_update(mm, addr, ptep, ~0UL, 0, 0);
266 }
267 
268 
269 /* Set the dirty and/or accessed bits atomically in a linux PTE */
270 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
271 					   pte_t *ptep, pte_t entry,
272 					   unsigned long address,
273 					   int psize)
274 {
275 	unsigned long bits = pte_val(entry) &
276 		(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
277 
278 	unsigned long old = pte_val(*ptep);
279 	*ptep = __pte(old | bits);
280 
281 	flush_tlb_page(vma, address);
282 }
283 
284 #define __HAVE_ARCH_PTE_SAME
285 #define pte_same(A,B)	((pte_val(A) ^ pte_val(B)) == 0)
286 
287 #define pte_ERROR(e) \
288 	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
289 #define pmd_ERROR(e) \
290 	pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
291 #define pgd_ERROR(e) \
292 	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
293 
294 /* Encode and de-code a swap entry */
295 #define MAX_SWAPFILES_CHECK() do { \
296 	BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
297 	} while (0)
298 
299 #define SWP_TYPE_BITS 5
300 #define __swp_type(x)		(((x).val >> _PAGE_BIT_SWAP_TYPE) \
301 				& ((1UL << SWP_TYPE_BITS) - 1))
302 #define __swp_offset(x)		((x).val >> PTE_RPN_SHIFT)
303 #define __swp_entry(type, offset)	((swp_entry_t) { \
304 					((type) << _PAGE_BIT_SWAP_TYPE) \
305 					| ((offset) << PTE_RPN_SHIFT) })
306 
307 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
308 #define __swp_entry_to_pte(x)		__pte((x).val)
309 
310 int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
311 extern int __meminit vmemmap_create_mapping(unsigned long start,
312 					    unsigned long page_size,
313 					    unsigned long phys);
314 extern void vmemmap_remove_mapping(unsigned long start,
315 				   unsigned long page_size);
316 void __patch_exception(int exc, unsigned long addr);
317 #define patch_exception(exc, name) do { \
318 	extern unsigned int name; \
319 	__patch_exception((exc), (unsigned long)&name); \
320 } while (0)
321 
322 #endif /* __ASSEMBLY__ */
323 
324 #endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
325