1 | /* |
2 | * Microblaze MMU emulation for qemu. |
3 | * |
4 | * Copyright (c) 2009 Edgar E. Iglesias |
5 | * |
6 | * This library is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU Lesser General Public |
8 | * License as published by the Free Software Foundation; either |
9 | * version 2 of the License, or (at your option) any later version. |
10 | * |
11 | * This library is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | * Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
18 | */ |
19 | |
20 | #ifndef TARGET_MICROBLAZE_MMU_H |
21 | #define TARGET_MICROBLAZE_MMU_H |
22 | |
23 | #define MMU_R_PID 0 |
24 | #define MMU_R_ZPR 1 |
25 | #define MMU_R_TLBX 2 |
26 | #define MMU_R_TLBLO 3 |
27 | #define MMU_R_TLBHI 4 |
28 | #define MMU_R_TLBSX 5 |
29 | |
30 | #define RAM_DATA 1 |
31 | #define RAM_TAG 0 |
32 | |
33 | /* Tag portion */ |
34 | #define TLB_EPN_MASK MAKE_64BIT_MASK(10, 64 - 10) |
35 | #define TLB_PAGESZ_MASK 0x00000380 |
36 | #define TLB_PAGESZ(x) (((x) & 0x7) << 7) |
37 | #define PAGESZ_1K 0 |
38 | #define PAGESZ_4K 1 |
39 | #define PAGESZ_16K 2 |
40 | #define PAGESZ_64K 3 |
41 | #define PAGESZ_256K 4 |
42 | #define PAGESZ_1M 5 |
43 | #define PAGESZ_4M 6 |
44 | #define PAGESZ_16M 7 |
45 | #define TLB_VALID 0x00000040 /* Entry is valid */ |
46 | |
47 | /* Data portion */ |
48 | #define TLB_RPN_MASK MAKE_64BIT_MASK(10, 64 - 10) |
49 | #define TLB_PERM_MASK 0x00000300 |
50 | #define TLB_EX 0x00000200 /* Instruction execution allowed */ |
51 | #define TLB_WR 0x00000100 /* Writes permitted */ |
52 | #define TLB_ZSEL_MASK 0x000000F0 |
53 | #define TLB_ZSEL(x) (((x) & 0xF) << 4) |
54 | #define TLB_ATTR_MASK 0x0000000F |
55 | #define TLB_W 0x00000008 /* Caching is write-through */ |
56 | #define TLB_I 0x00000004 /* Caching is inhibited */ |
57 | #define TLB_M 0x00000002 /* Memory is coherent */ |
58 | #define TLB_G 0x00000001 /* Memory is guarded from prefetch */ |
59 | |
60 | /* TLBX */ |
61 | #define R_TBLX_MISS_SHIFT 31 |
62 | #define R_TBLX_MISS_MASK (1U << R_TBLX_MISS_SHIFT) |
63 | |
64 | #define TLB_ENTRIES 64 |
65 | |
66 | struct microblaze_mmu |
67 | { |
68 | /* Data and tag brams. */ |
69 | uint64_t rams[2][TLB_ENTRIES]; |
70 | /* We keep a separate ram for the tids to avoid the 48 bit tag width. */ |
71 | uint8_t tids[TLB_ENTRIES]; |
72 | /* Control flops. */ |
73 | uint32_t regs[3]; |
74 | |
75 | int c_mmu; |
76 | int c_mmu_tlb_access; |
77 | int c_mmu_zones; |
78 | uint64_t c_addr_mask; /* Mask to apply to physical addresses. */ |
79 | }; |
80 | |
81 | struct microblaze_mmu_lookup |
82 | { |
83 | uint32_t paddr; |
84 | uint32_t vaddr; |
85 | unsigned int size; |
86 | unsigned int idx; |
87 | int prot; |
88 | enum { |
89 | ERR_PROT, ERR_MISS, ERR_HIT |
90 | } err; |
91 | }; |
92 | |
93 | unsigned int mmu_translate(struct microblaze_mmu *mmu, |
94 | struct microblaze_mmu_lookup *lu, |
95 | target_ulong vaddr, int rw, int mmu_idx); |
96 | uint32_t mmu_read(CPUMBState *env, bool ea, uint32_t rn); |
97 | void mmu_write(CPUMBState *env, bool ea, uint32_t rn, uint32_t v); |
98 | void mmu_init(struct microblaze_mmu *mmu); |
99 | |
100 | #endif |
101 | |