| /* |
| * Microblaze MMU emulation for qemu. |
| * |
| * Copyright (c) 2009 Edgar E. Iglesias |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library; if not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #define MMU_R_PID 0 |
| #define MMU_R_ZPR 1 |
| #define MMU_R_TLBX 2 |
| #define MMU_R_TLBLO 3 |
| #define MMU_R_TLBHI 4 |
| #define MMU_R_TLBSX 5 |
| |
| #define RAM_DATA 1 |
| #define RAM_TAG 0 |
| |
| /* Tag portion */ |
| #define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */ |
| #define TLB_PAGESZ_MASK 0x00000380 |
| #define TLB_PAGESZ(x) (((x) & 0x7) << 7) |
| #define PAGESZ_1K 0 |
| #define PAGESZ_4K 1 |
| #define PAGESZ_16K 2 |
| #define PAGESZ_64K 3 |
| #define PAGESZ_256K 4 |
| #define PAGESZ_1M 5 |
| #define PAGESZ_4M 6 |
| #define PAGESZ_16M 7 |
| #define TLB_VALID 0x00000040 /* Entry is valid */ |
| |
| /* Data portion */ |
| #define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */ |
| #define TLB_PERM_MASK 0x00000300 |
| #define TLB_EX 0x00000200 /* Instruction execution allowed */ |
| #define TLB_WR 0x00000100 /* Writes permitted */ |
| #define TLB_ZSEL_MASK 0x000000F0 |
| #define TLB_ZSEL(x) (((x) & 0xF) << 4) |
| #define TLB_ATTR_MASK 0x0000000F |
| #define TLB_W 0x00000008 /* Caching is write-through */ |
| #define TLB_I 0x00000004 /* Caching is inhibited */ |
| #define TLB_M 0x00000002 /* Memory is coherent */ |
| #define TLB_G 0x00000001 /* Memory is guarded from prefetch */ |
| |
| #define TLB_ENTRIES 64 |
| |
| struct microblaze_mmu |
| { |
| /* Data and tag brams. */ |
| uint32_t rams[2][TLB_ENTRIES]; |
| /* We keep a separate ram for the tids to avoid the 48 bit tag width. */ |
| uint8_t tids[TLB_ENTRIES]; |
| /* Control flops. */ |
| uint32_t regs[8];; |
| }; |
| |
| struct microblaze_mmu_lookup |
| { |
| uint32_t paddr; |
| uint32_t vaddr; |
| unsigned int size; |
| unsigned int idx; |
| int prot; |
| enum { |
| ERR_PROT, ERR_MISS, ERR_HIT |
| } err; |
| }; |
| |
| void mmu_flip_um(CPUState *env, unsigned int um); |
| unsigned int mmu_translate(struct microblaze_mmu *mmu, |
| struct microblaze_mmu_lookup *lu, |
| target_ulong vaddr, int rw, int mmu_idx); |
| uint32_t mmu_read(CPUState *env, uint32_t rn); |
| void mmu_write(CPUState *env, uint32_t rn, uint32_t v); |
| void mmu_init(struct microblaze_mmu *mmu); |