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arm: smh: Add some functions for working with the host console

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This adds three wrappers around the semihosting commands for reading and
writing to the host console. We use the more standard getc/putc/puts
names instead of readc/writec/write0 for familiarity.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
This commit is contained in:
Sean Anderson 2022-03-22 16:59:23 -04:00 committed by Tom Rini
parent dcc4f9623e
commit 3ea744e873
2 changed files with 37 additions and 0 deletions
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18
arch/arm/lib/semihosting.c
View File

@ -15,8 +15,11 @@
#define SYSOPEN 0x01
#define SYSCLOSE 0x02
#define SYSWRITEC 0x03
#define SYSWRITE0 0x04
#define SYSWRITE 0x05
#define SYSREAD 0x06
#define SYSREADC 0x07
#define SYSSEEK 0x0A
#define SYSFLEN 0x0C
#define SYSERRNO 0x13
@ -167,3 +170,18 @@ long smh_seek(long fd, long pos)
return smh_errno();
return 0;
}
int smh_getc(void)
{
return smh_trap(SYSREADC, NULL);
}
void smh_putc(char ch)
{
smh_trap(SYSWRITEC, &ch);
}
void smh_puts(const char *s)
{
smh_trap(SYSWRITE0, (char *)s);
}

19
include/semihosting.h
View File

@ -86,4 +86,23 @@ long smh_flen(long fd);
*/
long smh_seek(long fd, long pos);
/**
* smh_getc() - Read a character from stdin
*
* Return: The character read, or a negative error on failure
*/
int smh_getc(void);
/**
* smh_putc() - Print a character on stdout
* @ch: The character to print
*/
void smh_putc(char ch);
/**
* smh_write0() - Print a nul-terminated string on stdout
* @s: The string to print
*/
void smh_puts(const char *s);
#endif /* _SEMIHOSTING_H */