1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H
3 #define _ASM_POWERPC_NOHASH_32_PGTABLE_H
5 #define __ARCH_USE_5LEVEL_HACK
6 #include <asm-generic/pgtable-nopmd.h>
9 #include <linux/sched.h>
10 #include <linux/threads.h>
11 #include <asm/mmu.h> /* For sub-arch specific PPC_PIN_SIZE */
12 #include <asm/asm-405.h>
15 extern int icache_44x_need_flush;
18 #endif /* __ASSEMBLY__ */
20 #define PTE_INDEX_SIZE PTE_SHIFT
21 #define PMD_INDEX_SIZE 0
22 #define PUD_INDEX_SIZE 0
23 #define PGD_INDEX_SIZE (32 - PGDIR_SHIFT)
25 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
26 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
29 #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
30 #define PMD_TABLE_SIZE 0
31 #define PUD_TABLE_SIZE 0
32 #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
33 #endif /* __ASSEMBLY__ */
35 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
36 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
39 * The normal case is that PTEs are 32-bits and we have a 1-page
40 * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus
42 * For any >32-bit physical address platform, we can use the following
43 * two level page table layout where the pgdir is 8KB and the MS 13 bits
44 * are an index to the second level table. The combined pgdir/pmd first
45 * level has 2048 entries and the second level has 512 64-bit PTE entries.
48 /* PGDIR_SHIFT determines what a top-level page table entry can map */
49 #define PGDIR_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
50 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
51 #define PGDIR_MASK (~(PGDIR_SIZE-1))
53 /* Bits to mask out from a PGD to get to the PUD page */
54 #define PGD_MASKED_BITS 0
56 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
57 #define FIRST_USER_ADDRESS 0UL
59 #define pte_ERROR(e) \
60 pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \
61 (unsigned long long)pte_val(e))
62 #define pgd_ERROR(e) \
63 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
67 int map_kernel_page(unsigned long va, phys_addr_t pa, pgprot_t prot);
69 #endif /* !__ASSEMBLY__ */
73 * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
74 * value (for now) on others, from where we can start layout kernel
75 * virtual space that goes below PKMAP and FIXMAP
77 #include <asm/fixmap.h>
80 * ioremap_bot starts at that address. Early ioremaps move down from there,
81 * until mem_init() at which point this becomes the top of the vmalloc
85 #define IOREMAP_TOP PKMAP_BASE
87 #define IOREMAP_TOP FIXADDR_START
90 /* PPC32 shares vmalloc area with ioremap */
91 #define IOREMAP_START VMALLOC_START
92 #define IOREMAP_END VMALLOC_END
95 * Just any arbitrary offset to the start of the vmalloc VM area: the
96 * current 16MB value just means that there will be a 64MB "hole" after the
97 * physical memory until the kernel virtual memory starts. That means that
98 * any out-of-bounds memory accesses will hopefully be caught.
99 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
100 * area for the same reason. ;)
102 * We no longer map larger than phys RAM with the BATs so we don't have
103 * to worry about the VMALLOC_OFFSET causing problems. We do have to worry
104 * about clashes between our early calls to ioremap() that start growing down
105 * from IOREMAP_TOP being run into the VM area allocations (growing upwards
106 * from VMALLOC_START). For this reason we have ioremap_bot to check when
107 * we actually run into our mappings setup in the early boot with the VM
108 * system. This really does become a problem for machines with good amounts
111 #define VMALLOC_OFFSET (0x1000000) /* 16M */
113 #define VMALLOC_START (((ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
115 #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
118 #ifdef CONFIG_KASAN_VMALLOC
119 #define VMALLOC_END ALIGN_DOWN(ioremap_bot, PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
121 #define VMALLOC_END ioremap_bot
125 * Bits in a linux-style PTE. These match the bits in the
126 * (hardware-defined) PowerPC PTE as closely as possible.
129 #if defined(CONFIG_40x)
130 #include <asm/nohash/32/pte-40x.h>
131 #elif defined(CONFIG_44x)
132 #include <asm/nohash/32/pte-44x.h>
133 #elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT)
134 #include <asm/nohash/pte-book3e.h>
135 #elif defined(CONFIG_FSL_BOOKE)
136 #include <asm/nohash/32/pte-fsl-booke.h>
137 #elif defined(CONFIG_PPC_8xx)
138 #include <asm/nohash/32/pte-8xx.h>
142 * Location of the PFN in the PTE. Most 32-bit platforms use the same
143 * as _PAGE_SHIFT here (ie, naturally aligned).
144 * Platform who don't just pre-define the value so we don't override it here.
146 #ifndef PTE_RPN_SHIFT
147 #define PTE_RPN_SHIFT (PAGE_SHIFT)
151 * The mask covered by the RPN must be a ULL on 32-bit platforms with
154 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
155 #define PTE_RPN_MASK (~((1ULL << PTE_RPN_SHIFT) - 1))
157 #define PTE_RPN_MASK (~((1UL << PTE_RPN_SHIFT) - 1))
161 * _PAGE_CHG_MASK masks of bits that are to be preserved across
164 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_SPECIAL)
168 #define pte_clear(mm, addr, ptep) \
169 do { pte_update(mm, addr, ptep, ~0, 0, 0); } while (0)
172 static inline pte_t pte_mkwrite(pte_t pte)
174 return __pte(pte_val(pte) | _PAGE_RW);
178 static inline pte_t pte_mkdirty(pte_t pte)
180 return __pte(pte_val(pte) | _PAGE_DIRTY);
183 static inline pte_t pte_mkyoung(pte_t pte)
185 return __pte(pte_val(pte) | _PAGE_ACCESSED);
188 #ifndef pte_wrprotect
189 static inline pte_t pte_wrprotect(pte_t pte)
191 return __pte(pte_val(pte) & ~_PAGE_RW);
195 static inline pte_t pte_mkexec(pte_t pte)
197 return __pte(pte_val(pte) | _PAGE_EXEC);
200 #define pmd_none(pmd) (!pmd_val(pmd))
201 #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
202 #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
203 static inline void pmd_clear(pmd_t *pmdp)
209 /* to find an entry in a kernel page-table-directory */
210 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
212 /* to find an entry in a page-table-directory */
213 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
214 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
217 * PTE updates. This function is called whenever an existing
218 * valid PTE is updated. This does -not- include set_pte_at()
219 * which nowadays only sets a new PTE.
221 * Depending on the type of MMU, we may need to use atomic updates
222 * and the PTE may be either 32 or 64 bit wide. In the later case,
223 * when using atomic updates, only the low part of the PTE is
224 * accessed atomically.
226 * In addition, on 44x, we also maintain a global flag indicating
227 * that an executable user mapping was modified, which is needed
228 * to properly flush the virtually tagged instruction cache of
229 * those implementations.
231 * On the 8xx, the page tables are a bit special. For 16k pages, we have
232 * 4 identical entries. For 512k pages, we have 128 entries as if it was
233 * 4k pages, but they are flagged as 512k pages for the hardware.
234 * For other page sizes, we have a single entry in the table.
236 #ifdef CONFIG_PPC_8xx
237 static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
238 unsigned long clr, unsigned long set, int huge)
240 pte_basic_t *entry = &p->pte;
241 pte_basic_t old = pte_val(*p);
242 pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
244 pmd_t *pmd = pmd_offset(pud_offset(pgd_offset(mm, addr), addr), addr);
247 num = PAGE_SIZE / SZ_4K;
248 else if ((pmd_val(*pmd) & _PMD_PAGE_MASK) != _PMD_PAGE_8M)
249 num = SZ_512K / SZ_4K;
253 for (i = 0; i < num; i++, entry++, new += SZ_4K)
259 static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
260 unsigned long clr, unsigned long set, int huge)
262 pte_basic_t old = pte_val(*p);
263 pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
268 if ((old & _PAGE_USER) && (old & _PAGE_EXEC))
269 icache_44x_need_flush = 1;
275 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
276 static inline int __ptep_test_and_clear_young(struct mm_struct *mm,
277 unsigned long addr, pte_t *ptep)
280 old = pte_update(mm, addr, ptep, _PAGE_ACCESSED, 0, 0);
281 return (old & _PAGE_ACCESSED) != 0;
283 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
284 __ptep_test_and_clear_young((__vma)->vm_mm, __addr, __ptep)
286 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
287 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
290 return __pte(pte_update(mm, addr, ptep, ~0, 0, 0));
293 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
294 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
297 unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
298 unsigned long set = pte_val(pte_wrprotect(__pte(0)));
300 pte_update(mm, addr, ptep, clr, set, 0);
303 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
304 pte_t *ptep, pte_t entry,
305 unsigned long address,
308 pte_t pte_set = pte_mkyoung(pte_mkdirty(pte_mkwrite(pte_mkexec(__pte(0)))));
309 pte_t pte_clr = pte_mkyoung(pte_mkdirty(pte_mkwrite(pte_mkexec(__pte(~0)))));
310 unsigned long set = pte_val(entry) & pte_val(pte_set);
311 unsigned long clr = ~pte_val(entry) & ~pte_val(pte_clr);
312 int huge = psize > mmu_virtual_psize ? 1 : 0;
314 pte_update(vma->vm_mm, address, ptep, clr, set, huge);
316 flush_tlb_page(vma, address);
319 static inline int pte_young(pte_t pte)
321 return pte_val(pte) & _PAGE_ACCESSED;
324 #define __HAVE_ARCH_PTE_SAME
325 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
328 * Note that on Book E processors, the pmd contains the kernel virtual
329 * (lowmem) address of the pte page. The physical address is less useful
330 * because everything runs with translation enabled (even the TLB miss
331 * handler). On everything else the pmd contains the physical address
332 * of the pte page. -- paulus
335 #define pmd_page_vaddr(pmd) \
336 ((unsigned long)__va(pmd_val(pmd) & ~(PTE_TABLE_SIZE - 1)))
337 #define pmd_page(pmd) \
338 pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
340 #define pmd_page_vaddr(pmd) \
341 ((unsigned long)(pmd_val(pmd) & ~(PTE_TABLE_SIZE - 1)))
342 #define pmd_page(pmd) \
343 pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT))
346 /* Find an entry in the third-level page table.. */
347 #define pte_index(address) \
348 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
349 #define pte_offset_kernel(dir, addr) \
350 (pmd_bad(*(dir)) ? NULL : (pte_t *)pmd_page_vaddr(*(dir)) + \
352 #define pte_offset_map(dir, addr) pte_offset_kernel((dir), (addr))
353 static inline void pte_unmap(pte_t *pte) { }
356 * Encode and decode a swap entry.
357 * Note that the bits we use in a PTE for representing a swap entry
358 * must not include the _PAGE_PRESENT bit.
361 #define __swp_type(entry) ((entry).val & 0x1f)
362 #define __swp_offset(entry) ((entry).val >> 5)
363 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) })
364 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
365 #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
367 #endif /* !__ASSEMBLY__ */
369 #endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */