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>
14 extern unsigned long ioremap_bot;
17 extern int icache_44x_need_flush;
20 #endif /* __ASSEMBLY__ */
22 #define PTE_INDEX_SIZE PTE_SHIFT
23 #define PMD_INDEX_SIZE 0
24 #define PUD_INDEX_SIZE 0
25 #define PGD_INDEX_SIZE (32 - PGDIR_SHIFT)
27 #define PMD_CACHE_INDEX PMD_INDEX_SIZE
28 #define PUD_CACHE_INDEX PUD_INDEX_SIZE
31 #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE)
32 #define PMD_TABLE_SIZE 0
33 #define PUD_TABLE_SIZE 0
34 #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
35 #endif /* __ASSEMBLY__ */
37 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
38 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
41 * The normal case is that PTEs are 32-bits and we have a 1-page
42 * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus
44 * For any >32-bit physical address platform, we can use the following
45 * two level page table layout where the pgdir is 8KB and the MS 13 bits
46 * are an index to the second level table. The combined pgdir/pmd first
47 * level has 2048 entries and the second level has 512 64-bit PTE entries.
50 /* PGDIR_SHIFT determines what a top-level page table entry can map */
51 #define PGDIR_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
52 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
53 #define PGDIR_MASK (~(PGDIR_SIZE-1))
55 /* Bits to mask out from a PGD to get to the PUD page */
56 #define PGD_MASKED_BITS 0
58 #define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
59 #define FIRST_USER_ADDRESS 0UL
61 #define pte_ERROR(e) \
62 pr_err("%s:%d: bad pte %llx.\n", __FILE__, __LINE__, \
63 (unsigned long long)pte_val(e))
64 #define pgd_ERROR(e) \
65 pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
68 * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
69 * value (for now) on others, from where we can start layout kernel
70 * virtual space that goes below PKMAP and FIXMAP
73 #define KVIRT_TOP PKMAP_BASE
75 #define KVIRT_TOP (0xfe000000UL) /* for now, could be FIXMAP_BASE ? */
79 * ioremap_bot starts at that address. Early ioremaps move down from there,
80 * until mem_init() at which point this becomes the top of the vmalloc
83 #ifdef CONFIG_NOT_COHERENT_CACHE
84 #define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK)
86 #define IOREMAP_TOP KVIRT_TOP
90 * Just any arbitrary offset to the start of the vmalloc VM area: the
91 * current 16MB value just means that there will be a 64MB "hole" after the
92 * physical memory until the kernel virtual memory starts. That means that
93 * any out-of-bounds memory accesses will hopefully be caught.
94 * The vmalloc() routines leaves a hole of 4kB between each vmalloced
95 * area for the same reason. ;)
97 * We no longer map larger than phys RAM with the BATs so we don't have
98 * to worry about the VMALLOC_OFFSET causing problems. We do have to worry
99 * about clashes between our early calls to ioremap() that start growing down
100 * from IOREMAP_TOP being run into the VM area allocations (growing upwards
101 * from VMALLOC_START). For this reason we have ioremap_bot to check when
102 * we actually run into our mappings setup in the early boot with the VM
103 * system. This really does become a problem for machines with good amounts
106 #define VMALLOC_OFFSET (0x1000000) /* 16M */
108 #define VMALLOC_START (((_ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
110 #define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
112 #define VMALLOC_END ioremap_bot
115 * Bits in a linux-style PTE. These match the bits in the
116 * (hardware-defined) PowerPC PTE as closely as possible.
119 #if defined(CONFIG_40x)
120 #include <asm/nohash/32/pte-40x.h>
121 #elif defined(CONFIG_44x)
122 #include <asm/nohash/32/pte-44x.h>
123 #elif defined(CONFIG_FSL_BOOKE) && defined(CONFIG_PTE_64BIT)
124 #include <asm/nohash/pte-book3e.h>
125 #elif defined(CONFIG_FSL_BOOKE)
126 #include <asm/nohash/32/pte-fsl-booke.h>
127 #elif defined(CONFIG_PPC_8xx)
128 #include <asm/nohash/32/pte-8xx.h>
131 /* And here we include common definitions */
132 #include <asm/pte-common.h>
136 #define pte_clear(mm, addr, ptep) \
137 do { pte_update(ptep, ~0, 0); } while (0)
139 #define pmd_none(pmd) (!pmd_val(pmd))
140 #define pmd_bad(pmd) (pmd_val(pmd) & _PMD_BAD)
141 #define pmd_present(pmd) (pmd_val(pmd) & _PMD_PRESENT_MASK)
142 static inline void pmd_clear(pmd_t *pmdp)
150 * PTE updates. This function is called whenever an existing
151 * valid PTE is updated. This does -not- include set_pte_at()
152 * which nowadays only sets a new PTE.
154 * Depending on the type of MMU, we may need to use atomic updates
155 * and the PTE may be either 32 or 64 bit wide. In the later case,
156 * when using atomic updates, only the low part of the PTE is
157 * accessed atomically.
159 * In addition, on 44x, we also maintain a global flag indicating
160 * that an executable user mapping was modified, which is needed
161 * to properly flush the virtually tagged instruction cache of
162 * those implementations.
164 #ifndef CONFIG_PTE_64BIT
165 static inline unsigned long pte_update(pte_t *p,
169 #ifdef PTE_ATOMIC_UPDATES
170 unsigned long old, tmp;
172 __asm__ __volatile__("\
179 : "=&r" (old), "=&r" (tmp), "=m" (*p)
180 : "r" (p), "r" (clr), "r" (set), "m" (*p)
182 #else /* PTE_ATOMIC_UPDATES */
183 unsigned long old = pte_val(*p);
184 *p = __pte((old & ~clr) | set);
185 #endif /* !PTE_ATOMIC_UPDATES */
188 if ((old & _PAGE_USER) && (old & _PAGE_EXEC))
189 icache_44x_need_flush = 1;
193 #else /* CONFIG_PTE_64BIT */
194 static inline unsigned long long pte_update(pte_t *p,
198 #ifdef PTE_ATOMIC_UPDATES
199 unsigned long long old;
202 __asm__ __volatile__("\
210 : "=&r" (old), "=&r" (tmp), "=m" (*p)
211 : "r" (p), "r" ((unsigned long)(p) + 4), "r" (clr), "r" (set), "m" (*p)
213 #else /* PTE_ATOMIC_UPDATES */
214 unsigned long long old = pte_val(*p);
215 *p = __pte((old & ~(unsigned long long)clr) | set);
216 #endif /* !PTE_ATOMIC_UPDATES */
219 if ((old & _PAGE_USER) && (old & _PAGE_EXEC))
220 icache_44x_need_flush = 1;
224 #endif /* CONFIG_PTE_64BIT */
226 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
227 static inline int __ptep_test_and_clear_young(unsigned int context, unsigned long addr, pte_t *ptep)
230 old = pte_update(ptep, _PAGE_ACCESSED, 0);
231 return (old & _PAGE_ACCESSED) != 0;
233 #define ptep_test_and_clear_young(__vma, __addr, __ptep) \
234 __ptep_test_and_clear_young((__vma)->vm_mm->context.id, __addr, __ptep)
236 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
237 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
240 return __pte(pte_update(ptep, ~0, 0));
243 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
244 static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr,
247 pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), _PAGE_RO);
249 static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
250 unsigned long addr, pte_t *ptep)
252 ptep_set_wrprotect(mm, addr, ptep);
256 static inline void __ptep_set_access_flags(struct vm_area_struct *vma,
257 pte_t *ptep, pte_t entry,
258 unsigned long address,
261 unsigned long set = pte_val(entry) &
262 (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_RW | _PAGE_EXEC);
263 unsigned long clr = ~pte_val(entry) & (_PAGE_RO | _PAGE_NA);
265 pte_update(ptep, clr, set);
267 flush_tlb_page(vma, address);
270 static inline int pte_young(pte_t pte)
272 return pte_val(pte) & _PAGE_ACCESSED;
275 #define __HAVE_ARCH_PTE_SAME
276 #define pte_same(A,B) ((pte_val(A) ^ pte_val(B)) == 0)
279 * Note that on Book E processors, the pmd contains the kernel virtual
280 * (lowmem) address of the pte page. The physical address is less useful
281 * because everything runs with translation enabled (even the TLB miss
282 * handler). On everything else the pmd contains the physical address
283 * of the pte page. -- paulus
286 #define pmd_page_vaddr(pmd) \
287 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK))
288 #define pmd_page(pmd) \
289 pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)
291 #define pmd_page_vaddr(pmd) \
292 ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
293 #define pmd_page(pmd) \
294 pfn_to_page((__pa(pmd_val(pmd)) >> PAGE_SHIFT))
297 /* to find an entry in a kernel page-table-directory */
298 #define pgd_offset_k(address) pgd_offset(&init_mm, address)
300 /* to find an entry in a page-table-directory */
301 #define pgd_index(address) ((address) >> PGDIR_SHIFT)
302 #define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
304 /* Find an entry in the third-level page table.. */
305 #define pte_index(address) \
306 (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
307 #define pte_offset_kernel(dir, addr) \
308 (pmd_bad(*(dir)) ? NULL : (pte_t *)pmd_page_vaddr(*(dir)) + \
310 #define pte_offset_map(dir, addr) \
311 ((pte_t *) kmap_atomic(pmd_page(*(dir))) + pte_index(addr))
312 #define pte_unmap(pte) kunmap_atomic(pte)
315 * Encode and decode a swap entry.
316 * Note that the bits we use in a PTE for representing a swap entry
317 * must not include the _PAGE_PRESENT bit.
320 #define __swp_type(entry) ((entry).val & 0x1f)
321 #define __swp_offset(entry) ((entry).val >> 5)
322 #define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) })
323 #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 })
324 #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 })
326 int map_kernel_page(unsigned long va, phys_addr_t pa, int flags);
328 #endif /* !__ASSEMBLY__ */
330 #endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */