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risc-v: implement DBCN write byte

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The DBCN extension provides a Console Write Byte call.
Implement function sbi_dbcn_write_byte to invoke it.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
This commit is contained in:
Heinrich Schuchardt 2023-09-04 13:24:03 +02:00 committed by Leo Yu-Chi Liang
parent ef08687ea0
commit d14222e7c1
2 changed files with 17 additions and 0 deletions
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1
arch/riscv/include/asm/sbi.h
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@ -170,5 +170,6 @@ int sbi_get_mvendorid(long *mvendorid);
int sbi_get_marchid(long *marchid);
int sbi_get_mimpid(long *mimpid);
void sbi_srst_reset(unsigned long type, unsigned long reason);
int sbi_dbcn_write_byte(unsigned char ch);
#endif

16
arch/riscv/lib/sbi.c
View file

@ -204,6 +204,22 @@ void sbi_srst_reset(unsigned long type, unsigned long reason)
0, 0, 0, 0);
}
/**
* sbi_dbcn_write_byte() - write byte to debug console
*
* @ch: byte to be written
* Return: SBI error code (SBI_SUCCESS = 0 on success)
*/
int sbi_dbcn_write_byte(unsigned char ch)
{
struct sbiret ret;
ret = sbi_ecall(SBI_EXT_DBCN,
SBI_EXT_DBCN_CONSOLE_WRITE_BYTE,
ch, 0, 0, 0, 0, 0);
return ret.error;
}
#ifdef CONFIG_SBI_V01
/**