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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" | |
32 | #include "cpu.h" | |
33 | ||
34 | #include "hw/sysbus.h" | |
35 | #include "hw/hw.h" | |
36 | #include "hw/char/serial.h" | |
37 | #include "sysemu/sysemu.h" | |
38 | #include "hw/boards.h" | |
39 | #include "exec/memory.h" | |
40 | #include "exec/address-spaces.h" | |
41 | #include "qemu/config-file.h" | |
42 | ||
43 | #include "boot.h" | |
44 | ||
45 | #define BINARY_DEVICE_TREE_FILE "generic-nommu.dtb" | |
46 | ||
47 | static void nios2_generic_nommu_init(MachineState *machine) | |
48 | { | |
49 | Nios2CPU *cpu; | |
50 | MemoryRegion *address_space_mem = get_system_memory(); | |
51 | MemoryRegion *phys_tcm = g_new(MemoryRegion, 1); | |
52 | MemoryRegion *phys_tcm_alias = g_new(MemoryRegion, 1); | |
53 | MemoryRegion *phys_ram = g_new(MemoryRegion, 1); | |
54 | MemoryRegion *phys_ram_alias = g_new(MemoryRegion, 1); | |
55 | ram_addr_t tcm_base = 0x0; | |
56 | ram_addr_t tcm_size = 0x1000; /* 1 kiB, but QEMU limit is 4 kiB */ | |
57 | ram_addr_t ram_base = 0x10000000; | |
58 | ram_addr_t ram_size = 0x08000000; | |
59 | ||
60 | /* Physical TCM (tb_ram_1k) with alias at 0xc0000000 */ | |
61 | memory_region_init_ram(phys_tcm, NULL, "nios2.tcm", tcm_size, | |
62 | &error_abort); | |
63 | memory_region_init_alias(phys_tcm_alias, NULL, "nios2.tcm.alias", | |
64 | phys_tcm, 0, tcm_size); | |
65 | memory_region_add_subregion(address_space_mem, tcm_base, phys_tcm); | |
66 | memory_region_add_subregion(address_space_mem, 0xc0000000 + tcm_base, | |
67 | phys_tcm_alias); | |
68 | ||
69 | /* Physical DRAM with alias at 0xc0000000 */ | |
70 | memory_region_init_ram(phys_ram, NULL, "nios2.ram", ram_size, | |
71 | &error_abort); | |
72 | memory_region_init_alias(phys_ram_alias, NULL, "nios2.ram.alias", | |
73 | phys_ram, 0, ram_size); | |
74 | memory_region_add_subregion(address_space_mem, ram_base, phys_ram); | |
75 | memory_region_add_subregion(address_space_mem, 0xc0000000 + ram_base, | |
76 | phys_ram_alias); | |
77 | ||
78 | cpu = NIOS2_CPU(cpu_create(TYPE_NIOS2_CPU)); | |
79 | ||
80 | /* Remove MMU */ | |
81 | cpu->mmu_present = false; | |
82 | ||
83 | /* Reset vector is the first 32 bytes of RAM. */ | |
84 | cpu->reset_addr = ram_base; | |
85 | ||
86 | /* The interrupt vector comes right after reset. */ | |
87 | cpu->exception_addr = ram_base + 0x20; | |
88 | ||
89 | /* | |
90 | * The linker script does have a TLB miss memory region declared, | |
91 | * but this should never be used with no MMU. | |
92 | */ | |
93 | cpu->fast_tlb_miss_addr = 0x7fff400; | |
94 | ||
95 | nios2_load_kernel(cpu, ram_base, ram_size, machine->initrd_filename, | |
96 | BINARY_DEVICE_TREE_FILE, NULL); | |
97 | } | |
98 | ||
99 | static void nios2_generic_nommu_machine_init(struct MachineClass *mc) | |
100 | { | |
101 | mc->desc = "Generic NOMMU Nios II design"; | |
102 | mc->init = nios2_generic_nommu_init; | |
103 | } | |
104 | ||
105 | DEFINE_MACHINE("nios2-generic-nommu", nios2_generic_nommu_machine_init); |