[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] xen/riscv: introduce sbi call to putchar to console
commit 90caa47aa33efb6408514ce09721624a2bdf6694 Author: Bobby Eshleman <bobby.eshleman@xxxxxxxxx> AuthorDate: Fri Jan 20 09:26:31 2023 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Fri Jan 20 09:26:31 2023 +0100 xen/riscv: introduce sbi call to putchar to console Originally SBI implementation for Xen was introduced by Bobby Eshleman <bobby.eshleman@xxxxxxxxx> but it was removed all the stuff for simplicity except SBI call for putting character to console. The patch introduces sbi_putchar() SBI call which is necessary to implement initial early_printk. Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxx> Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx> Reviewed-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxx> Reviewed-by: Alistair Francis <alistair.francis@xxxxxxx> --- xen/arch/riscv/Makefile | 1 + xen/arch/riscv/include/asm/sbi.h | 34 +++++++++++++++++++++++++++++++ xen/arch/riscv/sbi.c | 44 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 79 insertions(+) diff --git a/xen/arch/riscv/Makefile b/xen/arch/riscv/Makefile index 5a67a3f493..fd916e1004 100644 --- a/xen/arch/riscv/Makefile +++ b/xen/arch/riscv/Makefile @@ -1,4 +1,5 @@ obj-$(CONFIG_RISCV_64) += riscv64/ +obj-y += sbi.o obj-y += setup.o $(TARGET): $(TARGET)-syms diff --git a/xen/arch/riscv/include/asm/sbi.h b/xen/arch/riscv/include/asm/sbi.h new file mode 100644 index 0000000000..0e6820a4ed --- /dev/null +++ b/xen/arch/riscv/include/asm/sbi.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: (GPL-2.0-or-later) */ +/* + * Copyright (c) 2021-2023 Vates SAS. + * + * Taken from xvisor, modified by Bobby Eshleman (bobby.eshleman@xxxxxxxxx). + * + * Taken/modified from Xvisor project with the following copyright: + * + * Copyright (c) 2019 Western Digital Corporation or its affiliates. + */ + +#ifndef __ASM_RISCV_SBI_H__ +#define __ASM_RISCV_SBI_H__ + +#define SBI_EXT_0_1_CONSOLE_PUTCHAR 0x1 + +struct sbiret { + long error; + long value; +}; + +struct sbiret sbi_ecall(unsigned long ext, unsigned long fid, + unsigned long arg0, unsigned long arg1, + unsigned long arg2, unsigned long arg3, + unsigned long arg4, unsigned long arg5); + +/** + * Writes given character to the console device. + * + * @param ch The data to be written to the console. + */ +void sbi_console_putchar(int ch); + +#endif /* __ASM_RISCV_SBI_H__ */ diff --git a/xen/arch/riscv/sbi.c b/xen/arch/riscv/sbi.c new file mode 100644 index 0000000000..0ae166c861 --- /dev/null +++ b/xen/arch/riscv/sbi.c @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Taken and modified from the xvisor project with the copyright Copyright (c) + * 2019 Western Digital Corporation or its affiliates and author Anup Patel + * (anup.patel@xxxxxxx). + * + * Modified by Bobby Eshleman (bobby.eshleman@xxxxxxxxx). + * + * Copyright (c) 2019 Western Digital Corporation or its affiliates. + * Copyright (c) 2021-2023 Vates SAS. + */ + +#include <asm/sbi.h> + +struct sbiret sbi_ecall(unsigned long ext, unsigned long fid, + unsigned long arg0, unsigned long arg1, + unsigned long arg2, unsigned long arg3, + unsigned long arg4, unsigned long arg5) +{ + struct sbiret ret; + + register unsigned long a0 asm ("a0") = arg0; + register unsigned long a1 asm ("a1") = arg1; + register unsigned long a2 asm ("a2") = arg2; + register unsigned long a3 asm ("a3") = arg3; + register unsigned long a4 asm ("a4") = arg4; + register unsigned long a5 asm ("a5") = arg5; + register unsigned long a6 asm ("a6") = fid; + register unsigned long a7 asm ("a7") = ext; + + asm volatile ( "ecall" + : "+r" (a0), "+r" (a1) + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) + : "memory"); + ret.error = a0; + ret.value = a1; + + return ret; +} + +void sbi_console_putchar(int ch) +{ + sbi_ecall(SBI_EXT_0_1_CONSOLE_PUTCHAR, 0, ch, 0, 0, 0, 0, 0); +} -- generated by git-patchbot for /home/xen/git/xen.git#master
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