[PATCH v4 7/7] lib: utils/serial: Implement console_puts() for semihosting
Atish Patra
atishp at atishpatra.org
Mon Jan 9 01:37:32 PST 2023
On Wed, Jan 4, 2023 at 6:50 AM Anup Patel <apatel at ventanamicro.com> wrote:
>
> We implement console_puts() for semihosting serial driver to speed-up
> semihosting based prints.
>
> Signed-off-by: Anup Patel <apatel at ventanamicro.com>
> Reviewed-by: Xiang W <wxjstz at 126.com>
> Reviewed-by: Bin Meng <bmeng at tinylab.org>
> ---
> lib/utils/serial/semihosting.c | 33 +++++++++++++++++++++++++++++++++
> 1 file changed, 33 insertions(+)
>
> diff --git a/lib/utils/serial/semihosting.c b/lib/utils/serial/semihosting.c
> index 86fa296..773b75e 100644
> --- a/lib/utils/serial/semihosting.c
> +++ b/lib/utils/serial/semihosting.c
> @@ -15,6 +15,7 @@
>
> #define SYSOPEN 0x01
> #define SYSWRITEC 0x03
> +#define SYSWRITE 0x05
> #define SYSREAD 0x06
> #define SYSREADC 0x07
> #define SYSERRNO 0x13
> @@ -93,6 +94,7 @@ static int semihosting_errno(void)
> }
>
> static int semihosting_infd = SBI_ENODEV;
> +static int semihosting_outfd = SBI_ENODEV;
>
> static long semihosting_open(const char *fname, enum semihosting_open_mode mode)
> {
> @@ -141,6 +143,21 @@ static long semihosting_read(long fd, void *memp, size_t len)
> return len - ret;
> }
>
> +static long semihosting_write(long fd, const void *memp, size_t len)
> +{
> + long ret;
> + struct semihosting_rdwr_s write;
> +
> + write.fd = fd;
> + write.memp = (void *)memp;
> + write.len = len;
> +
> + ret = semihosting_trap(SYSWRITE, &write);
> + if (ret < 0)
> + return semihosting_errno();
> + return len - ret;
> +}
> +
> /* clang-format on */
>
> static void semihosting_putc(char ch)
> @@ -148,6 +165,20 @@ static void semihosting_putc(char ch)
> semihosting_trap(SYSWRITEC, &ch);
> }
>
> +static void semihosting_puts(const char *str, unsigned long len)
> +{
> + char ch;
> + unsigned long i;
> +
> + if (semihosting_outfd < 0) {
> + for (i = 0; i < len; i++) {
> + ch = str[i];
> + semihosting_trap(SYSWRITEC, &ch);
> + }
> + } else
> + semihosting_write(semihosting_outfd, str, len);
> +}
> +
> static int semihosting_getc(void)
> {
> char ch = 0;
> @@ -165,12 +196,14 @@ static int semihosting_getc(void)
> static struct sbi_console_device semihosting_console = {
> .name = "semihosting",
> .console_putc = semihosting_putc,
> + .console_puts = semihosting_puts,
> .console_getc = semihosting_getc
> };
>
> int semihosting_init(void)
> {
> semihosting_infd = semihosting_open(":tt", MODE_READ);
> + semihosting_outfd = semihosting_open(":tt", MODE_WRITE);
>
> sbi_console_set_device(&semihosting_console);
>
> --
> 2.34.1
>
Reviewed-by: Atish Patra <atishp at rivosinc.com>
--
Regards,
Atish
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