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ed960ba9 SL |
1 | /* |
2 | * Generic simulator target with no MMU or devices. This emulation is | |
3 | * compatible with the libgloss qemu-hosted.ld linker script for using | |
4 | * QEMU as an instruction set simulator. | |
5 | * | |
6 | * Copyright (c) 2018-2019 Mentor Graphics | |
7 | * | |
8 | * Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com> | |
9 | * | |
10 | * Based on LabX device code | |
11 | * | |
12 | * Copyright (c) 2012 Chris Wulff <crwulff@gmail.com> | |
13 | * | |
14 | * This library is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU Lesser General Public | |
16 | * License as published by the Free Software Foundation; either | |
17 | * version 2.1 of the License, or (at your option) any later version. | |
18 | * | |
19 | * This library is distributed in the hope that it will be useful, | |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
22 | * Lesser General Public License for more details. | |
23 | * | |
24 | * You should have received a copy of the GNU Lesser General Public | |
25 | * License along with this library; if not, see | |
26 | * <http://www.gnu.org/licenses/lgpl-2.1.html> | |
27 | */ | |
28 | ||
29 | #include "qemu/osdep.h" | |
30 | #include "qapi/error.h" | |
31 | #include "qemu-common.h" | |
ed960ba9 | 32 | |
ed960ba9 | 33 | #include "hw/char/serial.h" |
ed960ba9 SL |
34 | #include "hw/boards.h" |
35 | #include "exec/memory.h" | |
36 | #include "exec/address-spaces.h" | |
37 | #include "qemu/config-file.h" | |
38 | ||
39 | #include "boot.h" | |
40 | ||
41 | #define BINARY_DEVICE_TREE_FILE "generic-nommu.dtb" | |
42 | ||
43 | static void nios2_generic_nommu_init(MachineState *machine) | |
44 | { | |
45 | Nios2CPU *cpu; | |
46 | MemoryRegion *address_space_mem = get_system_memory(); | |
47 | MemoryRegion *phys_tcm = g_new(MemoryRegion, 1); | |
48 | MemoryRegion *phys_tcm_alias = g_new(MemoryRegion, 1); | |
49 | MemoryRegion *phys_ram = g_new(MemoryRegion, 1); | |
50 | MemoryRegion *phys_ram_alias = g_new(MemoryRegion, 1); | |
51 | ram_addr_t tcm_base = 0x0; | |
52 | ram_addr_t tcm_size = 0x1000; /* 1 kiB, but QEMU limit is 4 kiB */ | |
53 | ram_addr_t ram_base = 0x10000000; | |
54 | ram_addr_t ram_size = 0x08000000; | |
55 | ||
56 | /* Physical TCM (tb_ram_1k) with alias at 0xc0000000 */ | |
57 | memory_region_init_ram(phys_tcm, NULL, "nios2.tcm", tcm_size, | |
58 | &error_abort); | |
59 | memory_region_init_alias(phys_tcm_alias, NULL, "nios2.tcm.alias", | |
60 | phys_tcm, 0, tcm_size); | |
61 | memory_region_add_subregion(address_space_mem, tcm_base, phys_tcm); | |
62 | memory_region_add_subregion(address_space_mem, 0xc0000000 + tcm_base, | |
63 | phys_tcm_alias); | |
64 | ||
65 | /* Physical DRAM with alias at 0xc0000000 */ | |
66 | memory_region_init_ram(phys_ram, NULL, "nios2.ram", ram_size, | |
67 | &error_abort); | |
68 | memory_region_init_alias(phys_ram_alias, NULL, "nios2.ram.alias", | |
69 | phys_ram, 0, ram_size); | |
70 | memory_region_add_subregion(address_space_mem, ram_base, phys_ram); | |
71 | memory_region_add_subregion(address_space_mem, 0xc0000000 + ram_base, | |
72 | phys_ram_alias); | |
73 | ||
74 | cpu = NIOS2_CPU(cpu_create(TYPE_NIOS2_CPU)); | |
75 | ||
76 | /* Remove MMU */ | |
77 | cpu->mmu_present = false; | |
78 | ||
79 | /* Reset vector is the first 32 bytes of RAM. */ | |
80 | cpu->reset_addr = ram_base; | |
81 | ||
82 | /* The interrupt vector comes right after reset. */ | |
83 | cpu->exception_addr = ram_base + 0x20; | |
84 | ||
85 | /* | |
86 | * The linker script does have a TLB miss memory region declared, | |
87 | * but this should never be used with no MMU. | |
88 | */ | |
89 | cpu->fast_tlb_miss_addr = 0x7fff400; | |
90 | ||
91 | nios2_load_kernel(cpu, ram_base, ram_size, machine->initrd_filename, | |
92 | BINARY_DEVICE_TREE_FILE, NULL); | |
93 | } | |
94 | ||
95 | static void nios2_generic_nommu_machine_init(struct MachineClass *mc) | |
96 | { | |
97 | mc->desc = "Generic NOMMU Nios II design"; | |
98 | mc->init = nios2_generic_nommu_init; | |
99 | } | |
100 | ||
101 | DEFINE_MACHINE("nios2-generic-nommu", nios2_generic_nommu_machine_init); |