1 #ifndef _ASM_POWERPC_MMU_H_
2 #define _ASM_POWERPC_MMU_H_
5 #include <linux/types.h>
7 #include <asm/asm-compat.h>
8 #include <asm/feature-fixups.h>
11 * MMU features bit definitions
17 #define MMU_FTR_HPTE_TABLE ASM_CONST(0x00000001)
18 #define MMU_FTR_TYPE_8xx ASM_CONST(0x00000002)
19 #define MMU_FTR_TYPE_40x ASM_CONST(0x00000004)
20 #define MMU_FTR_TYPE_44x ASM_CONST(0x00000008)
21 #define MMU_FTR_TYPE_FSL_E ASM_CONST(0x00000010)
22 #define MMU_FTR_TYPE_47x ASM_CONST(0x00000020)
24 /* Radix page table supported and enabled */
25 #define MMU_FTR_TYPE_RADIX ASM_CONST(0x00000040)
28 * Individual features below.
32 * We need to clear top 16bits of va (from the remaining 64 bits )in
35 #define MMU_FTR_TLBIE_CROP_VA ASM_CONST(0x00008000)
37 /* Enable use of high BAT registers */
38 #define MMU_FTR_USE_HIGH_BATS ASM_CONST(0x00010000)
40 /* Enable >32-bit physical addresses on 32-bit processor, only used
41 * by CONFIG_6xx currently as BookE supports that from day 1
43 #define MMU_FTR_BIG_PHYS ASM_CONST(0x00020000)
45 /* Enable use of broadcast TLB invalidations. We don't always set it
46 * on processors that support it due to other constraints with the
47 * use of such invalidations
49 #define MMU_FTR_USE_TLBIVAX_BCAST ASM_CONST(0x00040000)
51 /* Enable use of tlbilx invalidate instructions.
53 #define MMU_FTR_USE_TLBILX ASM_CONST(0x00080000)
55 /* This indicates that the processor cannot handle multiple outstanding
56 * broadcast tlbivax or tlbsync. This makes the code use a spinlock
57 * around such invalidate forms.
59 #define MMU_FTR_LOCK_BCAST_INVAL ASM_CONST(0x00100000)
61 /* This indicates that the processor doesn't handle way selection
62 * properly and needs SW to track and update the LRU state. This
63 * is specific to an errata on e300c2/c3/c4 class parts
65 #define MMU_FTR_NEED_DTLB_SW_LRU ASM_CONST(0x00200000)
67 /* Enable use of TLB reservation. Processor should support tlbsrx.
68 * instruction and MAS0[WQ].
70 #define MMU_FTR_USE_TLBRSRV ASM_CONST(0x00800000)
72 /* Use paired MAS registers (MAS7||MAS3, etc.)
74 #define MMU_FTR_USE_PAIRED_MAS ASM_CONST(0x01000000)
76 /* Doesn't support the B bit (1T segment) in SLBIE
78 #define MMU_FTR_NO_SLBIE_B ASM_CONST(0x02000000)
80 /* Support 16M large pages
82 #define MMU_FTR_16M_PAGE ASM_CONST(0x04000000)
84 /* Supports TLBIEL variant
86 #define MMU_FTR_TLBIEL ASM_CONST(0x08000000)
88 /* Supports tlbies w/o locking
90 #define MMU_FTR_LOCKLESS_TLBIE ASM_CONST(0x10000000)
92 /* Large pages can be marked CI
94 #define MMU_FTR_CI_LARGE_PAGE ASM_CONST(0x20000000)
96 /* 1T segments available
98 #define MMU_FTR_1T_SEGMENT ASM_CONST(0x40000000)
100 /* MMU feature bit sets for various CPUs */
101 #define MMU_FTRS_DEFAULT_HPTE_ARCH_V2 \
102 MMU_FTR_HPTE_TABLE | MMU_FTR_PPCAS_ARCH_V2
103 #define MMU_FTRS_POWER4 MMU_FTRS_DEFAULT_HPTE_ARCH_V2
104 #define MMU_FTRS_PPC970 MMU_FTRS_POWER4 | MMU_FTR_TLBIE_CROP_VA
105 #define MMU_FTRS_POWER5 MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
106 #define MMU_FTRS_POWER6 MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
107 #define MMU_FTRS_POWER7 MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
108 #define MMU_FTRS_POWER8 MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
109 #define MMU_FTRS_POWER9 MMU_FTRS_POWER4 | MMU_FTR_LOCKLESS_TLBIE
110 #define MMU_FTRS_CELL MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
111 MMU_FTR_CI_LARGE_PAGE
112 #define MMU_FTRS_PA6T MMU_FTRS_DEFAULT_HPTE_ARCH_V2 | \
113 MMU_FTR_CI_LARGE_PAGE | MMU_FTR_NO_SLBIE_B
115 #include <linux/bug.h>
116 #include <asm/cputable.h>
118 #ifdef CONFIG_PPC_FSL_BOOK3E
119 #include <asm/percpu.h>
120 DECLARE_PER_CPU(int, next_tlbcam_idx);
124 MMU_FTRS_POSSIBLE = MMU_FTR_HPTE_TABLE | MMU_FTR_TYPE_8xx |
125 MMU_FTR_TYPE_40x | MMU_FTR_TYPE_44x | MMU_FTR_TYPE_FSL_E |
126 MMU_FTR_TYPE_47x | MMU_FTR_USE_HIGH_BATS | MMU_FTR_BIG_PHYS |
127 MMU_FTR_USE_TLBIVAX_BCAST | MMU_FTR_USE_TLBILX |
128 MMU_FTR_LOCK_BCAST_INVAL | MMU_FTR_NEED_DTLB_SW_LRU |
129 MMU_FTR_USE_TLBRSRV | MMU_FTR_USE_PAIRED_MAS |
130 MMU_FTR_NO_SLBIE_B | MMU_FTR_16M_PAGE | MMU_FTR_TLBIEL |
131 MMU_FTR_LOCKLESS_TLBIE | MMU_FTR_CI_LARGE_PAGE |
132 MMU_FTR_1T_SEGMENT | MMU_FTR_TLBIE_CROP_VA |
133 #ifdef CONFIG_PPC_RADIX_MMU
139 static inline bool early_mmu_has_feature(unsigned long feature)
141 return !!(MMU_FTRS_POSSIBLE & cur_cpu_spec->mmu_features & feature);
144 #ifdef CONFIG_JUMP_LABEL_FEATURE_CHECKS
145 #include <linux/jump_label.h>
147 #define NUM_MMU_FTR_KEYS 32
149 extern struct static_key_true mmu_feature_keys[NUM_MMU_FTR_KEYS];
151 extern void mmu_feature_keys_init(void);
153 static __always_inline bool mmu_has_feature(unsigned long feature)
157 BUILD_BUG_ON(!__builtin_constant_p(feature));
159 if (!(MMU_FTRS_POSSIBLE & feature))
162 i = __builtin_ctzl(feature);
163 return static_branch_likely(&mmu_feature_keys[i]);
166 static inline void mmu_clear_feature(unsigned long feature)
170 i = __builtin_ctzl(feature);
171 cur_cpu_spec->mmu_features &= ~feature;
172 static_branch_disable(&mmu_feature_keys[i]);
176 static inline void mmu_feature_keys_init(void)
181 static inline bool mmu_has_feature(unsigned long feature)
183 return early_mmu_has_feature(feature);
186 static inline void mmu_clear_feature(unsigned long feature)
188 cur_cpu_spec->mmu_features &= ~feature;
190 #endif /* CONFIG_JUMP_LABEL */
192 extern unsigned int __start___mmu_ftr_fixup, __stop___mmu_ftr_fixup;
195 /* This is our real memory area size on ppc64 server, on embedded, we
196 * make it match the size our of bolted TLB area
198 extern u64 ppc64_rma_size;
199 #endif /* CONFIG_PPC64 */
202 #ifdef CONFIG_DEBUG_VM
203 extern void assert_pte_locked(struct mm_struct *mm, unsigned long addr);
204 #else /* CONFIG_DEBUG_VM */
205 static inline void assert_pte_locked(struct mm_struct *mm, unsigned long addr)
208 #endif /* !CONFIG_DEBUG_VM */
210 #ifdef CONFIG_PPC_RADIX_MMU
211 static inline bool radix_enabled(void)
213 return mmu_has_feature(MMU_FTR_TYPE_RADIX);
216 static inline bool early_radix_enabled(void)
218 return early_mmu_has_feature(MMU_FTR_TYPE_RADIX);
221 static inline bool radix_enabled(void)
226 static inline bool early_radix_enabled(void)
232 #endif /* !__ASSEMBLY__ */
234 /* The kernel use the constants below to index in the page sizes array.
235 * The use of fixed constants for this purpose is better for performances
236 * of the low level hash refill handlers.
238 * A non supported page size has a "shift" field set to 0
240 * Any new page size being implemented can get a new entry in here. Whether
241 * the kernel will use it or not is a different matter though. The actual page
242 * size used by hugetlbfs is not defined here and may be made variable
244 * Note: This array ended up being a false good idea as it's growing to the
245 * point where I wonder if we should replace it with something different,
246 * to think about, feedback welcome. --BenH.
249 /* These are #defines as they have to be used in assembly */
250 #define MMU_PAGE_4K 0
251 #define MMU_PAGE_16K 1
252 #define MMU_PAGE_64K 2
253 #define MMU_PAGE_64K_AP 3 /* "Admixed pages" (hash64 only) */
254 #define MMU_PAGE_256K 4
255 #define MMU_PAGE_1M 5
256 #define MMU_PAGE_2M 6
257 #define MMU_PAGE_4M 7
258 #define MMU_PAGE_8M 8
259 #define MMU_PAGE_16M 9
260 #define MMU_PAGE_64M 10
261 #define MMU_PAGE_256M 11
262 #define MMU_PAGE_1G 12
263 #define MMU_PAGE_16G 13
264 #define MMU_PAGE_64G 14
266 #define MMU_PAGE_COUNT 15
268 #ifdef CONFIG_PPC_BOOK3S_64
269 #include <asm/book3s/64/mmu.h>
270 #else /* CONFIG_PPC_BOOK3S_64 */
273 /* MMU initialization */
274 extern void early_init_mmu(void);
275 extern void early_init_mmu_secondary(void);
276 extern void setup_initial_memory_limit(phys_addr_t first_memblock_base,
277 phys_addr_t first_memblock_size);
278 static inline void mmu_early_init_devtree(void) { }
279 #endif /* __ASSEMBLY__ */
282 #if defined(CONFIG_PPC_STD_MMU_32)
283 /* 32-bit classic hash table MMU */
284 #include <asm/book3s/32/mmu-hash.h>
285 #elif defined(CONFIG_40x)
286 /* 40x-style software loaded TLB */
287 # include <asm/mmu-40x.h>
288 #elif defined(CONFIG_44x)
289 /* 44x-style software loaded TLB */
290 # include <asm/mmu-44x.h>
291 #elif defined(CONFIG_PPC_BOOK3E_MMU)
292 /* Freescale Book-E software loaded TLB or Book-3e (ISA 2.06+) MMU */
293 # include <asm/mmu-book3e.h>
294 #elif defined (CONFIG_PPC_8xx)
295 /* Motorola/Freescale 8xx software loaded TLB */
296 # include <asm/mmu-8xx.h>
299 #endif /* __KERNEL__ */
300 #endif /* _ASM_POWERPC_MMU_H_ */