From 25108684fe235d4296c3cbc480298df209682586 Mon Sep 17 00:00:00 2001 From: stefan Date: Tue, 4 Apr 2023 06:01:50 +0000 Subject: build system and some other stuff --- sys/dev/sbi.c | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 sys/dev/sbi.c (limited to 'sys/dev/sbi.c') diff --git a/sys/dev/sbi.c b/sys/dev/sbi.c new file mode 100644 index 0000000..0c9e3f2 --- /dev/null +++ b/sys/dev/sbi.c @@ -0,0 +1,39 @@ +#include + +struct sbiret +sbi_ecall(int ext, int fid, unsigned long arg0, + unsigned long arg1, unsigned long arg2, + unsigned long arg3, unsigned long arg4, + unsigned long arg5) +{ + struct sbiret ret; + + register unsigned long a0 asm ("a0") = (unsigned long)(arg0); + register unsigned long a1 asm ("a1") = (unsigned long)(arg1); + register unsigned long a2 asm ("a2") = (unsigned long)(arg2); + register unsigned long a3 asm ("a3") = (unsigned long)(arg3); + register unsigned long a4 asm ("a4") = (unsigned long)(arg4); + register unsigned long a5 asm ("a5") = (unsigned long)(arg5); + register unsigned long a6 asm ("a6") = (unsigned long)(fid); + register unsigned long a7 asm ("a7") = (unsigned long)(ext); + asm volatile ("ecall" + : "+r" (a0), "+r" (a1) + : "r" (a2), "r" (a3), "r" (a4), "r" (a5), "r" (a6), "r" (a7) + : "memory"); + ret.err = a0; + ret.val = a1; + + return ret; +} + +void +sbi_console_putchar(int c) +{ + sbi_ecall(1, 0, c, 0, 0, 0, 0, 0); +} + +void +sbi_shutdown(void) +{ + sbi_ecall(8, 0, 0, 0, 0, 0, 0, 0); +} -- cgit v1.2.3