On 05. 12. 22, 6:00, Bin Meng wrote:
...
--- a/drivers/tty/serial/earlycon-arm-semihost.c
+++ b/drivers/tty/serial/earlycon-arm-semihost.c
...
@@ -23,7 +27,18 @@
*/
static void smh_putc(struct uart_port *port, unsigned char c)
{
-#ifdef CONFIG_ARM64
+#if defined(CONFIG_RISCV)
+ asm volatile("addi a1, %0, 0\n"
+ "addi a0, zero, 3\n"
+ ".balign 16\n"
+ ".option push\n"
+ ".option norvc\n"
+ "slli zero, zero, 0x1f\n"
+ "ebreak\n"
+ "srai zero, zero, 0x7\n"
+ ".option pop\n"
+ : : "r" (&c) : "a0", "a1", "memory");
+#elif defined(CONFIG_ARM64)
asm volatile("mov x1, %0\n"
"mov x0, #3\n"
"hlt 0xf000\n"
Hmm, can we implement all those smh_putc() variants in respective
arch/*/include/semihost.h instead?
thanks,
--
js
suse labs
