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lib: utils/serial: add semihosting support

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We add RISC-V semihosting based serial console for JTAG based early
debugging.

The RISC-V semihosting specification is available at:
https://github.com/riscv/riscv-semihosting-spec/blob/main/riscv-semihosting-spec.adoc

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Kautuk Consul <kconsul@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Kautuk Consul
2022-09-12 16:22:53 +05:30
committed by Anup Patel
parent 49372f2691
commit 7f09fba86e
6 changed files with 241 additions and 1 deletions
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1
platform/generic/configs/defconfig
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@@ -28,3 +28,4 @@ CONFIG_FDT_SERIAL_UART8250=y
CONFIG_FDT_SERIAL_XILINX_UARTLITE=y
CONFIG_FDT_TIMER=y
CONFIG_FDT_TIMER_MTIMER=y
CONFIG_SERIAL_SEMIHOSTING=y

11
platform/generic/platform.c
View File

@@ -23,6 +23,7 @@
#include <sbi_utils/timer/fdt_timer.h>
#include <sbi_utils/ipi/fdt_ipi.h>
#include <sbi_utils/reset/fdt_reset.h>
#include <sbi_utils/serial/semihosting.h>
/* List of platform override modules generated at compile time */
extern const struct platform_override *platform_override_modules[];
@@ -242,6 +243,14 @@ static uint64_t generic_pmu_xlate_to_mhpmevent(uint32_t event_idx,
return evt_val;
}
static int generic_console_init(void)
{
if (semihosting_enabled())
return semihosting_init();
else
return fdt_serial_init();
}
const struct sbi_platform_operations platform_ops = {
.nascent_init = generic_nascent_init,
.early_init = generic_early_init,
@@ -249,7 +258,7 @@ const struct sbi_platform_operations platform_ops = {
.early_exit = generic_early_exit,
.final_exit = generic_final_exit,
.domains_init = generic_domains_init,
.console_init = fdt_serial_init,
.console_init = generic_console_init,
.irqchip_init = fdt_irqchip_init,
.irqchip_exit = fdt_irqchip_exit,
.ipi_init = fdt_ipi_init,