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Diffstat (limited to 'arch/sh/kernel/sh_bios.c')
-rw-r--r--arch/sh/kernel/sh_bios.c75
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/sh/kernel/sh_bios.c b/arch/sh/kernel/sh_bios.c
new file mode 100644
index 000000000000..5b53e10bb9cd
--- /dev/null
+++ b/arch/sh/kernel/sh_bios.c
@@ -0,0 +1,75 @@
+/*
+ * linux/arch/sh/kernel/sh_bios.c
+ * C interface for trapping into the standard LinuxSH BIOS.
+ *
+ * Copyright (C) 2000 Greg Banks, Mitch Davis
+ *
+ */
+
+#include <asm/sh_bios.h>
+
+#define BIOS_CALL_CONSOLE_WRITE 0
+#define BIOS_CALL_READ_BLOCK 1
+#define BIOS_CALL_ETH_NODE_ADDR 10
+#define BIOS_CALL_SHUTDOWN 11
+#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
+#define BIOS_CALL_GDB_GET_MODE_PTR 0xfe
+#define BIOS_CALL_GDB_DETACH 0xff
+
+static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
+{
+ register long r0 __asm__("r0") = func;
+ register long r4 __asm__("r4") = arg0;
+ register long r5 __asm__("r5") = arg1;
+ register long r6 __asm__("r6") = arg2;
+ register long r7 __asm__("r7") = arg3;
+ __asm__ __volatile__("trapa #0x3f"
+ : "=z" (r0)
+ : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
+ : "memory");
+ return r0;
+}
+
+
+void sh_bios_console_write(const char *buf, unsigned int len)
+{
+ sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
+}
+
+
+void sh_bios_char_out(char ch)
+{
+ sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
+}
+
+
+int sh_bios_in_gdb_mode(void)
+{
+ static char queried = 0;
+ static char *gdb_mode_p = 0;
+
+ if (!queried)
+ {
+ /* Query the gdb stub for address of its gdb mode variable */
+ long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
+ if (r != ~0) /* BIOS returns -1 for unknown function */
+ gdb_mode_p = (char *)r;
+ queried = 1;
+ }
+ return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
+}
+
+void sh_bios_gdb_detach(void)
+{
+ sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
+}
+
+void sh_bios_get_node_addr (unsigned char *node_addr)
+{
+ sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
+}
+
+void sh_bios_shutdown(unsigned int how)
+{
+ sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
+}