On Tue, Apr 21, 2020 at 6:35 AM wrote:
>
> From: Mitchell Horne
>
> Add the necessary changes to allow building the CONFIG_API option on the
> RISC-V architecture. The downstream consumer of this API is the u-boot
> version of FreeBSD's loader(8). This enables the loader to be ported to
Could you please include a URL for FreeBSD's loader(8)?
> RISC-V.
>
> Signed-off-by: Mitchell Horne
> Cc: r...@andestech.com
> Cc: bmeng...@gmail.com
> Cc: atish.pa...@wdc.com
> ---
> api/Makefile | 1 +
> api/api_platform-riscv.c | 33 +
> examples/api/Makefile| 3 +++
> examples/api/crt0.S | 15 +++
> 4 files changed, 52 insertions(+)
> create mode 100644 api/api_platform-riscv.c
>
> diff --git a/api/Makefile b/api/Makefile
> index bd2d035fcd..737854e2c6 100644
> --- a/api/Makefile
> +++ b/api/Makefile
> @@ -6,3 +6,4 @@ obj-y += api.o api_display.o api_net.o api_storage.o
> obj-$(CONFIG_ARM) += api_platform-arm.o
> obj-$(CONFIG_PPC) += api_platform-powerpc.o
> obj-$(CONFIG_MIPS) += api_platform-mips.o
> +obj-$(CONFIG_RISCV) += api_platform-riscv.o
> diff --git a/api/api_platform-riscv.c b/api/api_platform-riscv.c
> new file mode 100644
> index 00..33a56535f3
> --- /dev/null
> +++ b/api/api_platform-riscv.c
> @@ -0,0 +1,33 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * (C) Copyright 2007 Stanislav Galabov
> + *
> + * This file contains routines that fetch data from bd_info sources
> + */
> +
> +#include
> +#include
> +#include
> +
> +#include
> +#include
> +
> +#include "api_private.h"
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +/*
> + * Important notice: handling of individual fields MUST be kept in sync with
> + * include/asm-generic/u-boot.h, so any changes
> + * need to reflect their current state and layout of structures involved!
> + */
> +int platform_sys_info(struct sys_info *si)
> +{
> + int i;
> +
> + for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++)
> + platform_set_mr(si, gd->bd->bi_dram[i].start,
> + gd->bd->bi_dram[i].size, MR_ATTR_DRAM);
> +
> + return 1;
> +}
> diff --git a/examples/api/Makefile b/examples/api/Makefile
> index 8fa9c04118..0f9d0e013f 100644
> --- a/examples/api/Makefile
> +++ b/examples/api/Makefile
> @@ -18,6 +18,9 @@ else
> LOAD_ADDR = 0x8020
> endif
> endif
> +ifeq ($(ARCH),riscv)
> +LOAD_ADDR = 0x8400
> +endif
>
> # Resulting ELF and binary exectuables will be named demo and demo.bin
> extra-y = demo demo.bin
> diff --git a/examples/api/crt0.S b/examples/api/crt0.S
> index 658bc59a82..2ba23331df 100644
> --- a/examples/api/crt0.S
> +++ b/examples/api/crt0.S
> @@ -65,6 +65,21 @@ return_addr:
> .data
> .align 8
> .long 0
> +
> +#elif defined(CONFIG_RISCV)
> +#include
> + .text
> + .globl _start
> +_start:
> + lla t0, search_hint
Looks lla is only supported in newer assemblers?
> + REG_S sp, 0(t0)
> + tailmain
> +
> + .globl syscall
> +syscall:
> + lla t0, syscall_ptr
> + REG_L t2, 0(t0)
> + jr t2
> #else
> #error No support for this arch!
> #endif
> --
Regards,
Bin
