From: Mitchell Horne mhorne@FreeBSD.org
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 RISC-V.
Signed-off-by: Mitchell Horne mhorne@FreeBSD.org Cc: rick@andestech.com Cc: bmeng.cn@gmail.com Cc: atish.patra@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 0000000000..33a56535f3 --- /dev/null +++ b/api/api_platform-riscv.c @@ -0,0 +1,33 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2007 Stanislav Galabov sgalabov@gmail.com + * + * This file contains routines that fetch data from bd_info sources + */ + +#include <config.h> +#include <linux/types.h> +#include <api_public.h> + +#include <asm/u-boot.h> +#include <asm/global_data.h> + +#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 = 0x80200000 endif endif +ifeq ($(ARCH),riscv) +LOAD_ADDR = 0x84000000 +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 <asm/asm.h> + .text + .globl _start +_start: + lla t0, search_hint + REG_S sp, 0(t0) + tail main + + .globl syscall +syscall: + lla t0, syscall_ptr + REG_L t2, 0(t0) + jr t2 #else #error No support for this arch! #endif