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Add generic Nios II board. 

This patch adds support for a generic MMU-less Nios II board that can
be used e.g. for bare-metal compiler testing with the linker script
and startup code provided by libgloss.  Nios II booting is also
tweaked so that bare-metal binaries start executing in RAM starting at
0x00000000, rather than an alias at 0xc0000000, which allows features
such as unwinding to work when binaries are linked to start at the
beginning of the address space.

The generic_nommu.c parts are based on code by Andrew Jenner, which was
in turn based on code by Marek Vasut.

Originally by Marek Vasut and Andrew Jenner.

Signed-off-by: Sandra Loosemore <sandra@codesourcery.com>
Signed-off-by: Julian Brown <julian@codesourcery.com>
Signed-off-by: Andrew Jenner <andrew@codesourcery.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 1554321185-2825-2-git-send-email-sandra@codesourcery.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Sandra Loosemore 2019-04-03 13:53:04 -06:00 committed by Peter Maydell
parent e0fb2c3d89
commit ed960ba905
5 changed files with 123 additions and 6 deletions
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1
default-configs/nios2-softmmu.mak
View File

@ -3,3 +3,4 @@
# Boards:
#
CONFIG_NIOS2_10M50=y
CONFIG_NIOS2_GENERIC_NOMMU=y

4
hw/nios2/Kconfig
View File

@ -4,5 +4,9 @@ config NIOS2_10M50
select SERIAL
select ALTERA_TIMER
config NIOS2_GENERIC_NOMMU
bool
select NIOS2
config NIOS2
bool

1
hw/nios2/Makefile.objs
View File

@ -1,2 +1,3 @@
obj-y = boot.o cpu_pic.o
obj-$(CONFIG_NIOS2_10M50) += 10m50_devboard.o
obj-$(CONFIG_NIOS2_GENERIC_NOMMU) += generic_nommu.o

18
hw/nios2/boot.c
View File

@ -138,7 +138,6 @@ void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base,
if (kernel_filename) {
int kernel_size, fdt_size;
uint64_t entry, low, high;
uint32_t base32;
int big_endian = 0;
#ifdef TARGET_WORDS_BIGENDIAN
@ -149,17 +148,24 @@ void nios2_load_kernel(Nios2CPU *cpu, hwaddr ddr_base,
kernel_size = load_elf(kernel_filename, NULL, NULL, NULL,
&entry, &low, &high,
big_endian, EM_ALTERA_NIOS2, 0, 0);
base32 = entry;
if (base32 == 0xc0000000) {
if ((uint32_t)entry == 0xc0000000) {
/*
* The Nios II processor reference guide documents that the
* kernel is placed at virtual memory address 0xc0000000,
* and we've got something that points there. Reload it
* and adjust the entry to get the address in physical RAM.
*/
kernel_size = load_elf(kernel_filename, NULL,
translate_kernel_address, NULL,
&entry, NULL, NULL,
big_endian, EM_ALTERA_NIOS2, 0, 0);
boot_info.bootstrap_pc = ddr_base + 0xc0000000 +
(entry & 0x07ffffff);
} else {
/* Use the entry point in the ELF image. */
boot_info.bootstrap_pc = (uint32_t)entry;
}
/* Always boot into physical ram. */
boot_info.bootstrap_pc = ddr_base + 0xc0000000 + (entry & 0x07ffffff);
/* If it wasn't an ELF image, try an u-boot image. */
if (kernel_size < 0) {
hwaddr uentry, loadaddr = LOAD_UIMAGE_LOADADDR_INVALID;

105
hw/nios2/generic_nommu.c Normal file
View File

@ -0,0 +1,105 @@
/*
* Generic simulator target with no MMU or devices. This emulation is
* compatible with the libgloss qemu-hosted.ld linker script for using
* QEMU as an instruction set simulator.
*
* Copyright (c) 2018-2019 Mentor Graphics
*
* Copyright (c) 2016 Marek Vasut <marek.vasut@gmail.com>
*
* Based on LabX device code
*
* Copyright (c) 2012 Chris Wulff <crwulff@gmail.com>
*
* 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 2.1 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/lgpl-2.1.html>
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "cpu.h"
#include "hw/sysbus.h"
#include "hw/hw.h"
#include "hw/char/serial.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "exec/memory.h"
#include "exec/address-spaces.h"
#include "qemu/config-file.h"
#include "boot.h"
#define BINARY_DEVICE_TREE_FILE "generic-nommu.dtb"
static void nios2_generic_nommu_init(MachineState *machine)
{
Nios2CPU *cpu;
MemoryRegion *address_space_mem = get_system_memory();
MemoryRegion *phys_tcm = g_new(MemoryRegion, 1);
MemoryRegion *phys_tcm_alias = g_new(MemoryRegion, 1);
MemoryRegion *phys_ram = g_new(MemoryRegion, 1);
MemoryRegion *phys_ram_alias = g_new(MemoryRegion, 1);
ram_addr_t tcm_base = 0x0;
ram_addr_t tcm_size = 0x1000; /* 1 kiB, but QEMU limit is 4 kiB */
ram_addr_t ram_base = 0x10000000;
ram_addr_t ram_size = 0x08000000;
/* Physical TCM (tb_ram_1k) with alias at 0xc0000000 */
memory_region_init_ram(phys_tcm, NULL, "nios2.tcm", tcm_size,
&error_abort);
memory_region_init_alias(phys_tcm_alias, NULL, "nios2.tcm.alias",
phys_tcm, 0, tcm_size);
memory_region_add_subregion(address_space_mem, tcm_base, phys_tcm);
memory_region_add_subregion(address_space_mem, 0xc0000000 + tcm_base,
phys_tcm_alias);
/* Physical DRAM with alias at 0xc0000000 */
memory_region_init_ram(phys_ram, NULL, "nios2.ram", ram_size,
&error_abort);
memory_region_init_alias(phys_ram_alias, NULL, "nios2.ram.alias",
phys_ram, 0, ram_size);
memory_region_add_subregion(address_space_mem, ram_base, phys_ram);
memory_region_add_subregion(address_space_mem, 0xc0000000 + ram_base,
phys_ram_alias);
cpu = NIOS2_CPU(cpu_create(TYPE_NIOS2_CPU));
/* Remove MMU */
cpu->mmu_present = false;
/* Reset vector is the first 32 bytes of RAM. */
cpu->reset_addr = ram_base;
/* The interrupt vector comes right after reset. */
cpu->exception_addr = ram_base + 0x20;
/*
* The linker script does have a TLB miss memory region declared,
* but this should never be used with no MMU.
*/
cpu->fast_tlb_miss_addr = 0x7fff400;
nios2_load_kernel(cpu, ram_base, ram_size, machine->initrd_filename,
BINARY_DEVICE_TREE_FILE, NULL);
}
static void nios2_generic_nommu_machine_init(struct MachineClass *mc)
{
mc->desc = "Generic NOMMU Nios II design";
mc->init = nios2_generic_nommu_init;
}
DEFINE_MACHINE("nios2-generic-nommu", nios2_generic_nommu_machine_init);