[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v1 6/8] xen/riscv: introduce early_printk basic stuff
The patch introduces a basic stuff of early_printk functionality which will be enough to print 'hello from C environment" Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx> --- xen/arch/riscv/Kconfig.debug | 7 ++++++ xen/arch/riscv/Makefile | 1 + xen/arch/riscv/early_printk.c | 27 +++++++++++++++++++++++ xen/arch/riscv/include/asm/early_printk.h | 12 ++++++++++ 4 files changed, 47 insertions(+) create mode 100644 xen/arch/riscv/early_printk.c create mode 100644 xen/arch/riscv/include/asm/early_printk.h diff --git a/xen/arch/riscv/Kconfig.debug b/xen/arch/riscv/Kconfig.debug index e69de29bb2..940630fd62 100644 --- a/xen/arch/riscv/Kconfig.debug +++ b/xen/arch/riscv/Kconfig.debug @@ -0,0 +1,7 @@ +config EARLY_PRINTK + bool "Enable early printk config" + default DEBUG + depends on RISCV_64 + help + + Enables early printk debug messages diff --git a/xen/arch/riscv/Makefile b/xen/arch/riscv/Makefile index 60db415654..e8630fe68d 100644 --- a/xen/arch/riscv/Makefile +++ b/xen/arch/riscv/Makefile @@ -1,6 +1,7 @@ obj-$(CONFIG_RISCV_64) += riscv64/ obj-y += setup.o obj-y += sbi.o +obj-$(CONFIG_EARLY_PRINTK) += early_printk.o $(TARGET): $(TARGET)-syms $(OBJCOPY) -O binary -S $< $@ diff --git a/xen/arch/riscv/early_printk.c b/xen/arch/riscv/early_printk.c new file mode 100644 index 0000000000..f357f3220b --- /dev/null +++ b/xen/arch/riscv/early_printk.c @@ -0,0 +1,27 @@ +/* + * RISC-V early printk using SBI + * + * Copyright (C) 2021 Bobby Eshleman <bobbyeshleman@xxxxxxxxx> + */ +#include <asm/sbi.h> +#include <asm/early_printk.h> + +void early_puts(const char *s, size_t nr) +{ + while ( nr-- > 0 ) + { + if (*s == '\n') + sbi_console_putchar('\r'); + sbi_console_putchar(*s); + s++; + } +} + +void early_printk(const char *str) +{ + while (*str) + { + early_puts(str, 1); + str++; + } +} diff --git a/xen/arch/riscv/include/asm/early_printk.h b/xen/arch/riscv/include/asm/early_printk.h new file mode 100644 index 0000000000..05106e160d --- /dev/null +++ b/xen/arch/riscv/include/asm/early_printk.h @@ -0,0 +1,12 @@ +#ifndef __EARLY_PRINTK_H__ +#define __EARLY_PRINTK_H__ + +#include <xen/early_printk.h> + +#ifdef CONFIG_EARLY_PRINTK +void early_printk(const char *str); +#else +static inline void early_printk(const char *s) {}; +#endif + +#endif /* __EARLY_PRINTK_H__ */ -- 2.38.1
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