patch-2.4.0-test5 linux/arch/sh/kernel/sh_bios.c

• Lines: 71
• Date: Sat Jul 22 07:42:06 2000
• Orig file: v2.4.0-test4/linux/arch/sh/kernel/sh_bios.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test4/linux/arch/sh/kernel/sh_bios.c linux/arch/sh/kernel/sh_bios.c
@@ -0,0 +1,70 @@
+/* $Id$
+ *
+ *  linux/arch/sh/kernel/sh_bios.c
+ *  C interface for trapping into the standard LinuxSH BIOS.
+ *
+ *  Copyright (C) 2000 Greg Banks, Mitch Davis
+ *
+ */
+
+#include <linux/config.h>
+#include <asm/sh_bios.h>
+
+#ifdef CONFIG_SH_STANDARD_BIOS
+
+#define BIOS_CALL_CONSOLE_WRITE     	0
+#define BIOS_CALL_READ_BLOCK     	1   	/* not implemented */
+#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);
+}
+
+#endif
+