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#define FIRST_USER_ADDRESS	0UL
16
17/*
18 * Size of EA range mapped by our pagetables.
19 */
20#define PGTABLE_EADDR_SIZE (PTE_INDEX_SIZE + PMD_INDEX_SIZE + \
21			    PUD_INDEX_SIZE + PGD_INDEX_SIZE + PAGE_SHIFT)
22#define PGTABLE_RANGE (ASM_CONST(1) << PGTABLE_EADDR_SIZE)
23
24#define PMD_CACHE_INDEX	PMD_INDEX_SIZE
25#define PUD_CACHE_INDEX PUD_INDEX_SIZE
26
27/*
28 * Define the address range of the kernel non-linear virtual area
29 */
30#define KERN_VIRT_START ASM_CONST(0x8000000000000000)
31#define KERN_VIRT_SIZE	ASM_CONST(0x0000100000000000)
32
33/*
34 * The vmalloc space starts at the beginning of that region, and
35 * occupies a quarter of it on Book3E
36 * (we keep a quarter for the virtual memmap)
37 */
38#define VMALLOC_START	KERN_VIRT_START
39#define VMALLOC_SIZE	(KERN_VIRT_SIZE >> 2)
40#define VMALLOC_END	(VMALLOC_START + VMALLOC_SIZE)
41
42/*
43 * The second half of the kernel virtual space is used for IO mappings,
44 * it's itself carved into the PIO region (ISA and PHB IO space) and
45 * the ioremap space
46 *
47 *  ISA_IO_BASE = KERN_IO_START, 64K reserved area
48 *  PHB_IO_BASE = ISA_IO_BASE + 64K to ISA_IO_BASE + 2G, PHB IO spaces
49 * IOREMAP_BASE = ISA_IO_BASE + 2G to VMALLOC_START + PGTABLE_RANGE
50 */
51#define KERN_IO_START	(KERN_VIRT_START + (KERN_VIRT_SIZE >> 1))
52#define FULL_IO_SIZE	0x80000000ul
53#define  ISA_IO_BASE	(KERN_IO_START)
54#define  ISA_IO_END	(KERN_IO_START + 0x10000ul)
55#define  PHB_IO_BASE	(ISA_IO_END)
56#define  PHB_IO_END	(KERN_IO_START + FULL_IO_SIZE)
57#define IOREMAP_BASE	(PHB_IO_END)
58#define IOREMAP_START	(ioremap_bot)
59#define IOREMAP_END	(KERN_VIRT_START + KERN_VIRT_SIZE - FIXADDR_SIZE)
60#define FIXADDR_SIZE	SZ_32M
61
62
63/*
64 * Region IDs
65 */
66#define REGION_SHIFT		60UL
67#define REGION_MASK		(0xfUL << REGION_SHIFT)
68#define REGION_ID(ea)		(((unsigned long)(ea)) >> REGION_SHIFT)
69
70#define VMALLOC_REGION_ID	(REGION_ID(VMALLOC_START))
71#define KERNEL_REGION_ID	(REGION_ID(PAGE_OFFSET))
72#define USER_REGION_ID		(0UL)
73
74/*
75 * Defines the address of the vmemap area, in its own region on
76 * after the vmalloc space on Book3E
77 */
78#define VMEMMAP_BASE		VMALLOC_END
79#define VMEMMAP_END		KERN_IO_START
80#define vmemmap			((struct page *)VMEMMAP_BASE)
81
82
83/*
84 * Include the PTE bits definitions
85 */
86#include <asm/nohash/pte-book3e.h>
87
88#define _PAGE_SAO	0
89
90#define PTE_RPN_MASK	(~((1UL << PTE_RPN_SHIFT) - 1))
91
92/*
93 * _PAGE_CHG_MASK masks of bits that are to be preserved across
94 * pgprot changes.
95 */
96#define _PAGE_CHG_MASK	(PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
97
98#define H_PAGE_4K_PFN 0
99
100#ifndef __ASSEMBLY__
101/* pte_clear moved to later in this file */
102
103static inline pte_t pte_mkwrite(pte_t pte)
104{
105	return __pte(pte_val(pte) | _PAGE_RW);
106}
107
108static inline pte_t pte_mkdirty(pte_t pte)
109{
110	return __pte(pte_val(pte) | _PAGE_DIRTY);
111}
112
113static inline pte_t pte_mkyoung(pte_t pte)
114{
115	return __pte(pte_val(pte) | _PAGE_ACCESSED);
116}
117
118static inline pte_t pte_wrprotect(pte_t pte)
119{
120	return __pte(pte_val(pte) & ~_PAGE_RW);
121}
122
123static inline pte_t pte_mkexec(pte_t pte)
124{
125	return __pte(pte_val(pte) | _PAGE_EXEC);
126}
127
128#define PMD_BAD_BITS		(PTE_TABLE_SIZE-1)
129#define PUD_BAD_BITS		(PMD_TABLE_SIZE-1)
130
131static inline void pmd_set(pmd_t *pmdp, unsigned long val)
132{
133	*pmdp = __pmd(val);
134}
135
136static inline void pmd_clear(pmd_t *pmdp)
137{
138	*pmdp = __pmd(0);
139}
140
141static inline pte_t pmd_pte(pmd_t pmd)
142{
143	return __pte(pmd_val(pmd));
144}
145
146#define pmd_none(pmd)		(!pmd_val(pmd))
147#define	pmd_bad(pmd)		(!is_kernel_addr(pmd_val(pmd)) \
148				 || (pmd_val(pmd) & PMD_BAD_BITS))
149#define	pmd_present(pmd)	(!pmd_none(pmd))
150#define pmd_page_vaddr(pmd)	(pmd_val(pmd) & ~PMD_MASKED_BITS)
151extern struct page *pmd_page(pmd_t pmd);
152
153static inline void pud_set(pud_t *pudp, unsigned long val)
154{
155	*pudp = __pud(val);
156}
157
158static inline void pud_clear(pud_t *pudp)
159{
160	*pudp = __pud(0);
161}
162
163#define pud_none(pud)		(!pud_val(pud))
164#define	pud_bad(pud)		(!is_kernel_addr(pud_val(pud)) \
165				 || (pud_val(pud) & PUD_BAD_BITS))
166#define pud_present(pud)	(pud_val(pud) != 0)
167
168static inline pmd_t *pud_pgtable(pud_t pud)
169{
170	return (pmd_t *)(pud_val(pud) & ~PUD_MASKED_BITS);
171}
172
173extern struct page *pud_page(pud_t pud);
174
175static inline pte_t pud_pte(pud_t pud)
176{
177	return __pte(pud_val(pud));
178}
179
180static inline pud_t pte_pud(pte_t pte)
181{
182	return __pud(pte_val(pte));
183}
184#define pud_write(pud)		pte_write(pud_pte(pud))
185#define p4d_write(pgd)		pte_write(p4d_pte(p4d))
186
187static inline void p4d_set(p4d_t *p4dp, unsigned long val)
188{
189	*p4dp = __p4d(val);
190}
191
192/* Atomic PTE updates */
193static inline unsigned long pte_update(struct mm_struct *mm,
194				       unsigned long addr,
195				       pte_t *ptep, unsigned long clr,
196				       unsigned long set,
197				       int huge)
198{
199	unsigned long old = pte_val(*ptep);
200	*ptep = __pte((old & ~clr) | set);
201
202	/* huge pages use the old page table lock */
203	if (!huge)
204		assert_pte_locked(mm, addr);
205
206	return old;
207}
208
209static inline int pte_young(pte_t pte)
210{
211	return pte_val(pte) & _PAGE_ACCESSED;
212}
213
214static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
215					      unsigned long addr, pte_t *ptep)
216{
217	unsigned long old;
218
219	if (!pte_young(*ptep))
220		return 0;
221	old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
222	return (old & _PAGE_ACCESSED) != 0;
223}
224#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
225#define ptep_test_and_clear_young(__vma, __addr, __ptep)		   \
226({									   \
227	int __r;							   \
228	__r = __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep); \
229	__r;								   \
230})
231
232#define __HAVE_ARCH_PTEP_SET_WRPROTECT
233static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
234				      pte_t *ptep)
235{
236
237	if ((pte_val(*ptep) & _PAGE_RW) == 0)
238		return;
239
240	pte_update(mm, addr, ptep, _PAGE_RW, 0, 0);
241}
242
243#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
244static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
245					   unsigned long addr, pte_t *ptep)
246{
247	if ((pte_val(*ptep) & _PAGE_RW) == 0)
248		return;
249
250	pte_update(mm, addr, ptep, _PAGE_RW, 0, 1);
251}
252
253#define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
254#define ptep_clear_flush_young(__vma, __address, __ptep)		\
255({									\
256	int __young = __ptep_test_and_clear_young((__vma)->vm_mm, __address, \
257						  __ptep);		\
258	__young;							\
259})
260
261#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
262static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
263				       unsigned long addr, pte_t *ptep)
264{
265	unsigned long old = pte_update(mm, addr, ptep, ~0UL, 0, 0);
266	return __pte(old);
267}
268
269static inline void pte_clear(struct mm_struct *mm, unsigned long addr,
270			     pte_t * ptep)
271{
272	pte_update(mm, addr, ptep, ~0UL, 0, 0);
273}
274
275
276/* Set the dirty and/or accessed bits atomically in a linux PTE */
277static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
278					   pte_t *ptep, pte_t entry,
279					   unsigned long address,
280					   int psize)
281{
282	unsigned long bits = pte_val(entry) &
283		(_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
284
285	unsigned long old = pte_val(*ptep);
286	*ptep = __pte(old | bits);
287
288	flush_tlb_page(vma, address);
289}
290
291#define __HAVE_ARCH_PTE_SAME
292#define pte_same(A,B)	((pte_val(A) ^ pte_val(B)) == 0)
293
294#define pte_ERROR(e) \
295	pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
296#define pmd_ERROR(e) \
297	pr_err("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
298#define pgd_ERROR(e) \
299	pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
300
301/* Encode and de-code a swap entry */
302#define MAX_SWAPFILES_CHECK() do { \
303	BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \
304	} while (0)
305
306#define SWP_TYPE_BITS 5
307#define __swp_type(x)		(((x).val >> _PAGE_BIT_SWAP_TYPE) \
308				& ((1UL << SWP_TYPE_BITS) - 1))
309#define __swp_offset(x)		((x).val >> PTE_RPN_SHIFT)
310#define __swp_entry(type, offset)	((swp_entry_t) { \
311					((type) << _PAGE_BIT_SWAP_TYPE) \
312					| ((offset) << PTE_RPN_SHIFT) })
313
314#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
315#define __swp_entry_to_pte(x)		__pte((x).val)
316
317int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot);
318void unmap_kernel_page(unsigned long va);
319extern int __meminit vmemmap_create_mapping(unsigned long start,
320					    unsigned long page_size,
321					    unsigned long phys);
322extern void vmemmap_remove_mapping(unsigned long start,
323				   unsigned long page_size);
324#endif /* __ASSEMBLY__ */
325
326#endif /* _ASM_POWERPC_NOHASH_64_PGTABLE_H */
327