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machine/qemu: riscv32 virt board
Change-Id: I48be009b4c7aa239d90f7c1e35d880f4743190fe
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‎machine/qemu/riscv32/virt/boot/include.mk‎

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SOURCES += \
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$(CONFIG_MACHINEDIR)/boot/machine.cpp \
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$(CONFIG_MACHINEDIR)/boot/ns16550/ns16550.cpp

‎machine/qemu/riscv32/virt/boot/machine.cpp‎

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#include <machine.h>
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#include "ns16550/ns16550.h"
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#include <boot.h>
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/*
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* NS16550 compatible UART at physical address 0x10000000.
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*/
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void *const UART = reinterpret_cast<void *>(0x10000000);
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/*
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* Setup machine state
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*/
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void
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machine_setup()
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{
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/* QEMU doesn't require setup */
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}
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/*
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* Load kernel image
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*/
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int
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machine_load_image()
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{
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return load_bootimg();
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}
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/*
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* Panic handler
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*/
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[[noreturn]] void
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machine_panic()
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{
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/* Workaround for ancient clang bug. Looks like this will be fixed
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* in clang 12, https://reviews.llvm.org/D85393 */
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while (1) asm("");
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}
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/*
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* Configure boot console
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*/
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void
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boot_console_init()
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{
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serial::ns16550::early_init(UART, 0, CONFIG_EARLY_CONSOLE_CFLAG);
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}
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/*
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* Print a string
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*/
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void
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boot_console_print(const char *s, size_t len)
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{
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serial::ns16550::early_print(UART, s, len);
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}

‎machine/qemu/riscv32/virt/boot/ns16550‎

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../../../../../sys/dev/serial/ns16550

‎machine/qemu/riscv32/virt/conf/default‎

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/*
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* Kernel
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*/
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#ifdef CONFIG_MMU
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memory PAGE_OFFSET 0x80000000
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#else
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memory PAGE_OFFSET 0x00000000
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#endif
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memory KSTACK_SIZE 8192 // Kernel stack size
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option TIME_SLICE_MS 50 // milliseconds
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option HZ 1000
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option PAGE_SIZE 0x1000
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option IRQS 53 // External interrupts
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option MA_NORMAL_ATTR (MA_SPEED_0) // Normal allocations in DRAM
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option MA_FAST_ATTR (MA_SPEED_0) // Fast allocations in DRAM
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/*
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* RAM
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*/
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memory RAM_BASE 0x80000000
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memory RAM_SIZE 0x8000000
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/*
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* QEMU loads boot image at start of RAM when using -bios option.
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* Allow up to 16MiB image.
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* Place loader data at end of RAM.
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*/
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memory BOOTIMAGE_SIZE 0x1000000
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memory BOOTIMAGE_BASE (CONFIG_RAM_BASE_VIRT)
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memory LOADER_RAM_SIZE 0x2000
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memory LOADER_RAM_BASE (CONFIG_RAM_BASE_VIRT + CONFIG_RAM_SIZE - CONFIG_LOADER_RAM_SIZE)
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/*
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* Load kernel after boot image.
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* Allow up to 16MiB image.
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*/
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memory KERNEL_BASE (CONFIG_RAM_BASE_VIRT + CONFIG_BOOTIMAGE_SIZE)
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memory KERNEL_MAX_SIZE 0x1000000
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/*
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* Device drivers
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*/
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driver-2 sys/dev/intc/sifive/clint{.base = 0x02000000_phys, .clock = 10000000}
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driver-1 sys/dev/intc/sifive/plic{.base = 0x0c000000_phys}
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driver sys/dev/serial/ns16550{.name = "ttyS0", .base = 0x10000000_phys, .ipl = IPL_MIN, .irq = 10, .irq_mode = 0}
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/*
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* QEMU command line
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*/
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makeoption QEMU_IMG := bootimg
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makeoption QEMU_CMD := qemu-system-riscv32 -nographic -machine virt -cpu $(CONFIG_QEMU_CPU) -bios
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/*
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* Pretty machine name
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*/
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option MACHINE_NAME QEMU RISC-V 32-bit virt

‎machine/qemu/riscv32/virt/sys/include.mk‎

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LDSCRIPT := arch/$(CONFIG_ARCH)/kernel.ld
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SOURCES += \
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$(CONFIG_MACHINEDIR)/sys/machine.cpp

‎machine/qemu/riscv32/virt/sys/machine.cpp‎

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#include <arch/early_console.h>
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#include <arch/machine.h>
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#include <arch/mmio.h>
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#include <arch/mmu.h>
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#include <compiler.h>
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#include <conf/config.h>
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#include <conf/drivers.h>
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#include <cpu.h>
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#include <debug.h>
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#include <dev/intc/sifive/clint/clint.h>
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#include <dev/intc/sifive/plic/plic.h>
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#include <dev/serial/ns16550/ns16550.h>
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#include <intrinsics.h>
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#include <locore.h>
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#include <page.h>
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#include <sch.h>
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#include <sections.h>
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#include <thread.h>
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#include <types.h>
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constexpr auto UART = 0x10000000_phys;
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void
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machine_init(bootargs *args)
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{
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#ifdef CONFIG_MPU
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mpu_init(nullptr, 0, 0);
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#endif
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const meminfo memory[] = {
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/* Main memory */
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{
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.base = phys{CONFIG_RAM_BASE_PHYS},
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.size = CONFIG_RAM_SIZE,
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.attr = MA_SPEED_0,
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.priority = 0,
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},
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};
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page_init(memory, ARRAY_SIZE(memory), args);
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/* scratch register is 0 in kernel mode */
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#ifdef CONFIG_S_MODE
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csrw(sscratch{});
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#else
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csrw(mscratch{});
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#endif
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/* initialise kernel thread pointer */
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asm volatile("mv tp, %0" : : "r"(thread_cur()));
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}
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void
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machine_driver_init(bootargs *bootargs)
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{
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/*
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* Run driver initialisation
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*/
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#include <conf/drivers.c>
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}
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void
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machine_idle()
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{
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asm("wfi");
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}
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[[noreturn]] void
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machine_reset()
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{
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write32(reinterpret_cast<int *>(0x100000), 0x7777);
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/* Workaround clang bug. */
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while (1) asm("");
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}
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void
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machine_poweroff()
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{
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write32(reinterpret_cast<int *>(0x100000), 0x5555);
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/* Workaround clang bug. */
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while (1) asm("");
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}
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void
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machine_suspend()
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{
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info("Suspend is not supported on this platform.\n");
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}
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[[noreturn]] void
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machine_panic()
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{
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/* Workaround clang bug. */
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while (1) asm("");
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}
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void
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early_console_init()
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{
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/* QEMU doesn't care about baud rate */
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serial::ns16550::early_init(phys_to_virt(UART), 0, CONFIG_EARLY_CONSOLE_CFLAG);
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}
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void
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early_console_print(const char *s, size_t len)
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{
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serial::ns16550::early_print(phys_to_virt(UART), s, len);
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}
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__fast_text
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void
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machine_irq()
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{
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intc_sifive_plic_irq();
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}
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__fast_text
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void
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machine_timer()
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{
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intc_sifive_clint_timer_irq();
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}

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