arch/risc-v: Add support for StarFive JH7110 SoC

[lupyuen]

Summary

This PR adds support for the StarFive JH7110 RISC-V SoC. This will be used by the upcoming port of NuttX for PINE64 Star64 SBC. The source files are explained in the articles here

Modified Files in arch/risc-v

Kconfig: Added ARCH_CHIP_JH7110 for JH7110 SoC

New Files in arch/risc-v

include/jh7110/chip.h: JH7110 Definitions

include/jh7110/irq.h: Support 127 External Interrupts

src/jh7110/chip.h: Interrupt Stack Macro

src/jh7110/jh7110_allocateheap.c: Kernel Heap

src/jh7110/jh7110_head.S: Linux Header and Boot Code

src/jh7110/jh7110_irq.c: Configure Interrupts

src/jh7110/jh7110_irq_dispatch.c: Dispatch Interrupts

src/jh7110/jh7110_memorymap.h: Memory Map

src/jh7110/jh7110_mm_init.c, jh7110_mm_init.h: Memory Mgmt

src/jh7110/jh7110_pgalloc.c: Page Allocator

src/jh7110/jh7110_start.c: Startup Code

src/jh7110/jh7110_timerisr.c: Timer Interrupt

src/jh7110/hardware/jh7110_memorymap.h: PLIC Base Address

src/jh7110/hardware/jh7110_plic.h: PLIC Register Addresses

src/jh7110/Kconfig: JH7110 Config

src/jh7110/Make.defs: Makefile

Impact

This PR is needed for the upcoming port of NuttX for PINE64 Star64 SBC.

No impact on existing code, since the JH7110 source files are not used by existing code.

Testing

We tested the JH7110 source files on PINE64 Star64 SBC. NuttX boots correctly to NSH Shell:

• NuttX Log for Star64 JH7110

Starting kernel ...
clk u5_dw_i2c_clk_core already disabled
clk u5_dw_i2c_clk_apb already disabled
BCnx_start: Entry
uart_register: Registering /dev/console
uart_register: Registering /dev/ttyS0
work_start_lowpri: Starting low-priority kernel worker thread(s)
nx_start_application: Starting init task: /system/bin/init
elf_symname: Symbol has no name
elf_symvalue: SHN_UNDEF: Failed to get symbol name: -3
elf_relocateadd: Section 2 reloc 2: Undefined symbol[0] has no name: -3
up_exit: TCB=0x40409890 exiting
nx_start: CPU0: Beginning Idle Loop

NuttShell (NSH) NuttX-12.0.3
nsh> uname -a
posix_spawn: pid=0xc0202978 path=uname file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
exec_spawn: ERROR: Failed to load program 'uname': -2
nxposix_spawn_exec: ERROR: exec failed: 2
NuttX 12.0.3 7a92743-dirty Aug  3 2023 18:06:04 risc-v star64
nsh> free
posix_spawn: pid=0xc0202978 path=free file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
exec_spawn: ERROR: Failed to load program 'free': -2
nxposix_spawn_exec: ERROR: exec failed: 2
                   total       used       free    largest  nused  nfree
        Kmem:    2065400      14600    2050800    2049440     50      3
        Page:   20971520     643072   20328448   20328448
nsh> ls -l
posix_spawn: pid=0xc0202978 path=ls file_actions=0xc0202980 attr=0xc0202988 argv=0xc0202a28
exec_spawn: ERROR: Failed to load program 'ls': -2
nxposix_spawn_exec: ERROR: exec failed: 2
/:
 dr--r--r--       0 dev/
 dr--r--r--       0 proc/
 dr--r--r--       0 system/
nsh>

We may ignore the exec_spawn messages, they are caused by NSH attempting to load the app binaries from the NuttX Apps Filesystem (initrd), when they are actually built-in NSH Commands.