diff options
Diffstat (limited to 'arch/sh/kernel/sh_bios.c')
-rw-r--r-- | arch/sh/kernel/sh_bios.c | 129 |
1 files changed, 122 insertions, 7 deletions
diff --git a/arch/sh/kernel/sh_bios.c b/arch/sh/kernel/sh_bios.c index c852f780572..47475cca068 100644 --- a/arch/sh/kernel/sh_bios.c +++ b/arch/sh/kernel/sh_bios.c | |||
@@ -1,19 +1,30 @@ | |||
1 | /* | 1 | /* |
2 | * linux/arch/sh/kernel/sh_bios.c | ||
3 | * C interface for trapping into the standard LinuxSH BIOS. | 2 | * C interface for trapping into the standard LinuxSH BIOS. |
4 | * | 3 | * |
5 | * Copyright (C) 2000 Greg Banks, Mitch Davis | 4 | * Copyright (C) 2000 Greg Banks, Mitch Davis |
5 | * Copyright (C) 1999, 2000 Niibe Yutaka | ||
6 | * Copyright (C) 2002 M. R. Brown | ||
7 | * Copyright (C) 2004 - 2010 Paul Mundt | ||
6 | * | 8 | * |
9 | * This file is subject to the terms and conditions of the GNU General Public | ||
10 | * License. See the file "COPYING" in the main directory of this archive | ||
11 | * for more details. | ||
7 | */ | 12 | */ |
8 | #include <linux/module.h> | 13 | #include <linux/module.h> |
14 | #include <linux/console.h> | ||
15 | #include <linux/tty.h> | ||
16 | #include <linux/init.h> | ||
17 | #include <linux/io.h> | ||
18 | #include <linux/delay.h> | ||
9 | #include <asm/sh_bios.h> | 19 | #include <asm/sh_bios.h> |
10 | 20 | ||
11 | #define BIOS_CALL_CONSOLE_WRITE 0 | 21 | #define BIOS_CALL_CONSOLE_WRITE 0 |
12 | #define BIOS_CALL_ETH_NODE_ADDR 10 | 22 | #define BIOS_CALL_ETH_NODE_ADDR 10 |
13 | #define BIOS_CALL_SHUTDOWN 11 | 23 | #define BIOS_CALL_SHUTDOWN 11 |
14 | #define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */ | ||
15 | #define BIOS_CALL_GDB_DETACH 0xff | 24 | #define BIOS_CALL_GDB_DETACH 0xff |
16 | 25 | ||
26 | void *gdb_vbr_vector = NULL; | ||
27 | |||
17 | static inline long sh_bios_call(long func, long arg0, long arg1, long arg2, | 28 | static inline long sh_bios_call(long func, long arg0, long arg1, long arg2, |
18 | long arg3) | 29 | long arg3) |
19 | { | 30 | { |
@@ -23,6 +34,9 @@ static inline long sh_bios_call(long func, long arg0, long arg1, long arg2, | |||
23 | register long r6 __asm__("r6") = arg2; | 34 | register long r6 __asm__("r6") = arg2; |
24 | register long r7 __asm__("r7") = arg3; | 35 | register long r7 __asm__("r7") = arg3; |
25 | 36 | ||
37 | if (!gdb_vbr_vector) | ||
38 | return -ENOSYS; | ||
39 | |||
26 | __asm__ __volatile__("trapa #0x3f":"=z"(r0) | 40 | __asm__ __volatile__("trapa #0x3f":"=z"(r0) |
27 | :"0"(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7) | 41 | :"0"(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7) |
28 | :"memory"); | 42 | :"memory"); |
@@ -34,11 +48,6 @@ void sh_bios_console_write(const char *buf, unsigned int len) | |||
34 | sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0); | 48 | sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0); |
35 | } | 49 | } |
36 | 50 | ||
37 | void sh_bios_char_out(char ch) | ||
38 | { | ||
39 | sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0); | ||
40 | } | ||
41 | |||
42 | void sh_bios_gdb_detach(void) | 51 | void sh_bios_gdb_detach(void) |
43 | { | 52 | { |
44 | sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0); | 53 | sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0); |
@@ -55,3 +64,109 @@ void sh_bios_shutdown(unsigned int how) | |||
55 | { | 64 | { |
56 | sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0); | 65 | sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0); |
57 | } | 66 | } |
67 | |||
68 | /* | ||
69 | * Read the old value of the VBR register to initialise the vector | ||
70 | * through which debug and BIOS traps are delegated by the Linux trap | ||
71 | * handler. | ||
72 | */ | ||
73 | void sh_bios_vbr_init(void) | ||
74 | { | ||
75 | unsigned long vbr; | ||
76 | |||
77 | if (unlikely(gdb_vbr_vector)) | ||
78 | return; | ||
79 | |||
80 | __asm__ __volatile__ ("stc vbr, %0" : "=r" (vbr)); | ||
81 | |||
82 | if (vbr) { | ||
83 | gdb_vbr_vector = (void *)(vbr + 0x100); | ||
84 | printk(KERN_NOTICE "Setting GDB trap vector to %p\n", | ||
85 | gdb_vbr_vector); | ||
86 | } else | ||
87 | printk(KERN_NOTICE "SH-BIOS not detected\n"); | ||
88 | } | ||
89 | |||
90 | /** | ||
91 | * sh_bios_vbr_reload - Re-load the system VBR from the BIOS vector. | ||
92 | * | ||
93 | * This can be used by save/restore code to reinitialize the system VBR | ||
94 | * from the fixed BIOS VBR. A no-op if no BIOS VBR is known. | ||
95 | */ | ||
96 | void sh_bios_vbr_reload(void) | ||
97 | { | ||
98 | if (gdb_vbr_vector) | ||
99 | __asm__ __volatile__ ( | ||
100 | "ldc %0, vbr" | ||
101 | : | ||
102 | : "r" (((unsigned long) gdb_vbr_vector) - 0x100) | ||
103 | : "memory" | ||
104 | ); | ||
105 | } | ||
106 | |||
107 | /* | ||
108 | * Print a string through the BIOS | ||
109 | */ | ||
110 | static void sh_console_write(struct console *co, const char *s, | ||
111 | unsigned count) | ||
112 | { | ||
113 | sh_bios_console_write(s, count); | ||
114 | } | ||
115 | |||
116 | /* | ||
117 | * Setup initial baud/bits/parity. We do two things here: | ||
118 | * - construct a cflag setting for the first rs_open() | ||
119 | * - initialize the serial port | ||
120 | * Return non-zero if we didn't find a serial port. | ||
121 | */ | ||
122 | static int __init sh_console_setup(struct console *co, char *options) | ||
123 | { | ||
124 | int cflag = CREAD | HUPCL | CLOCAL; | ||
125 | |||
126 | /* | ||
127 | * Now construct a cflag setting. | ||
128 | * TODO: this is a totally bogus cflag, as we have | ||
129 | * no idea what serial settings the BIOS is using, or | ||
130 | * even if its using the serial port at all. | ||
131 | */ | ||
132 | cflag |= B115200 | CS8 | /*no parity*/0; | ||
133 | |||
134 | co->cflag = cflag; | ||
135 | |||
136 | return 0; | ||
137 | } | ||
138 | |||
139 | static struct console bios_console = { | ||
140 | .name = "bios", | ||
141 | .write = sh_console_write, | ||
142 | .setup = sh_console_setup, | ||
143 | .flags = CON_PRINTBUFFER, | ||
144 | .index = -1, | ||
145 | }; | ||
146 | |||
147 | static struct console *early_console; | ||
148 | |||
149 | static int __init setup_early_printk(char *buf) | ||
150 | { | ||
151 | int keep_early = 0; | ||
152 | |||
153 | if (!buf) | ||
154 | return 0; | ||
155 | |||
156 | if (strstr(buf, "keep")) | ||
157 | keep_early = 1; | ||
158 | |||
159 | if (!strncmp(buf, "bios", 4)) | ||
160 | early_console = &bios_console; | ||
161 | |||
162 | if (likely(early_console)) { | ||
163 | if (keep_early) | ||
164 | early_console->flags &= ~CON_BOOT; | ||
165 | else | ||
166 | early_console->flags |= CON_BOOT; | ||
167 | register_console(early_console); | ||
168 | } | ||
169 | |||
170 | return 0; | ||
171 | } | ||
172 | early_param("earlyprintk", setup_early_printk); | ||