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lib: sbi: Add console_puts() callback in the console device

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We add console_puts() callback in the console device which allows
console drivers (such as semihosting) to implement a specialized
way to output character string.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Bin Meng <bmeng@tinylab.org>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
This commit is contained in:
Anup Patel 2022-11-23 12:32:06 +05:30 • committed by Anup Patel
parent 5a41a3884f
commit c43903c4ea
2 changed files with 25 additions and 7 deletions
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3
include/sbi/sbi_console.h
View file

@ -19,6 +19,9 @@ struct sbi_console_device {
/** Write a character to the console output */ /** Write a character to the console output */
void (*console_putc)(char ch); void (*console_putc)(char ch);
/** Write a character string to the console output */
unsigned long (*console_puts)(const char *str, unsigned long len);
/** Read a character from the console input */ /** Read a character from the console input */
int (*console_getc)(void); int (*console_getc)(void);
}; };

29
lib/sbi/sbi_console.c
View file

@ -12,6 +12,7 @@
#include <sbi/sbi_hart.h> #include <sbi/sbi_hart.h>
#include <sbi/sbi_platform.h> #include <sbi/sbi_platform.h>
#include <sbi/sbi_scratch.h> #include <sbi/sbi_scratch.h>
#include <sbi/sbi_string.h>
static const struct sbi_console_device *console_dev = NULL; static const struct sbi_console_device *console_dev = NULL;
static spinlock_t console_out_lock = SPIN_LOCK_INITIALIZER; static spinlock_t console_out_lock = SPIN_LOCK_INITIALIZER;
@ -43,24 +44,38 @@ void sbi_putc(char ch)
void sbi_puts(const char *str) void sbi_puts(const char *str)
{ {
unsigned long p, len;
spin_lock(&console_out_lock); spin_lock(&console_out_lock);
while (*str) { if (console_dev && console_dev->console_puts) {
sbi_putc(*str); p = 0;
str++; len = sbi_strlen(str);
while (p < len)
p += console_dev->console_puts(&str[p], len - p);
} else {
while (*str) {
sbi_putc(*str);
str++;
}
} }
spin_unlock(&console_out_lock); spin_unlock(&console_out_lock);
} }
unsigned long sbi_nputs(const char *str, unsigned long len) unsigned long sbi_nputs(const char *str, unsigned long len)
{ {
unsigned long i; unsigned long i, ret;
spin_lock(&console_out_lock); spin_lock(&console_out_lock);
for (i = 0; i < len; i++) if (console_dev && console_dev->console_puts) {
sbi_putc(str[i]); ret = console_dev->console_puts(str, len);
} else {
for (i = 0; i < len; i++)
sbi_putc(str[i]);
ret = len;
}
spin_unlock(&console_out_lock); spin_unlock(&console_out_lock);
return i; return ret;
} }
void sbi_gets(char *s, int maxwidth, char endchar) void sbi_gets(char *s, int maxwidth, char endchar)