diff options
Diffstat (limited to 'arch/sh/kernel/sh_bios.c')
-rw-r--r-- | arch/sh/kernel/sh_bios.c | 75 |
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 0000000..5b53e10 --- /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); +} |