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e2a101ab VS |
1 | /* memrw.c - command to read / write physical memory */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
4 | * Copyright (C) 2009 Free Software Foundation, Inc. | |
5 | * | |
6 | * GRUB is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * GRUB is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <grub/dl.h> | |
21 | #include <grub/misc.h> | |
22 | #include <grub/extcmd.h> | |
23 | #include <grub/env.h> | |
24 | #include <grub/cpu/io.h> | |
d8b5cd40 | 25 | #include <grub/i18n.h> |
e2a101ab VS |
26 | |
27 | static grub_extcmd_t cmd_read_byte, cmd_read_word, cmd_read_dword; | |
28 | static grub_command_t cmd_write_byte, cmd_write_word, cmd_write_dword; | |
29 | ||
30 | static const struct grub_arg_option options[] = | |
31 | { | |
d8b5cd40 VS |
32 | {0, 'v', 0, N_("Save read value into variable VARNAME."), |
33 | N_("VARNAME"), ARG_TYPE_STRING}, | |
e2a101ab VS |
34 | {0, 0, 0, 0, 0, 0} |
35 | }; | |
36 | ||
37 | ||
38 | static grub_err_t | |
39 | grub_cmd_read (grub_extcmd_t cmd, int argc, char **argv) | |
40 | { | |
41 | grub_target_addr_t addr; | |
42 | grub_uint32_t value = 0; | |
43 | char buf[sizeof ("XXXXXXXX")]; | |
44 | ||
45 | if (argc != 1) | |
46 | return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments"); | |
47 | ||
48 | addr = grub_strtoul (argv[0], 0, 0); | |
165134bc | 49 | switch (cmd->cmd->name[sizeof ("in") - 1]) |
e2a101ab VS |
50 | { |
51 | case 'l': | |
52 | value = grub_inl (addr); | |
53 | break; | |
54 | ||
55 | case 'w': | |
56 | value = grub_inw (addr); | |
57 | break; | |
58 | ||
59 | case 'b': | |
60 | value = grub_inb (addr); | |
61 | break; | |
62 | } | |
63 | ||
64 | if (cmd->state[0].set) | |
65 | { | |
d8b5cd40 | 66 | grub_snprintf (buf, sizeof (buf), "%x", value); |
e2a101ab VS |
67 | grub_env_set (cmd->state[0].arg, buf); |
68 | } | |
69 | else | |
70 | grub_printf ("0x%x\n", value); | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | static grub_err_t | |
76 | grub_cmd_write (grub_command_t cmd, int argc, char **argv) | |
77 | { | |
78 | grub_target_addr_t addr; | |
79 | grub_uint32_t value; | |
80 | grub_uint32_t mask = 0xffffffff; | |
81 | ||
82 | if (argc != 2 && argc != 3) | |
83 | return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments"); | |
84 | ||
85 | addr = grub_strtoul (argv[0], 0, 0); | |
86 | value = grub_strtoul (argv[1], 0, 0); | |
87 | if (argc == 3) | |
88 | mask = grub_strtoul (argv[2], 0, 0); | |
89 | value &= mask; | |
165134bc | 90 | switch (cmd->name[sizeof ("out") - 1]) |
e2a101ab VS |
91 | { |
92 | case 'l': | |
93 | if (mask != 0xffffffff) | |
94 | grub_outl ((grub_inl (addr) & ~mask) | value, addr); | |
95 | else | |
96 | grub_outl (value, addr); | |
97 | break; | |
98 | ||
99 | case 'w': | |
100 | if ((mask & 0xffff) != 0xffff) | |
101 | grub_outw ((grub_inw (addr) & ~mask) | value, addr); | |
102 | else | |
103 | grub_outw (value, addr); | |
104 | break; | |
105 | ||
106 | case 'b': | |
107 | if ((mask & 0xff) != 0xff) | |
108 | grub_outb ((grub_inb (addr) & ~mask) | value, addr); | |
109 | else | |
110 | grub_outb (value, addr); | |
111 | break; | |
112 | } | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | GRUB_MOD_INIT(memrw) | |
118 | { | |
119 | cmd_read_byte = | |
165134bc | 120 | grub_register_extcmd ("inb", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH, |
d8b5cd40 | 121 | N_("PORT"), N_("Read byte from PORT."), options); |
e2a101ab | 122 | cmd_read_word = |
165134bc | 123 | grub_register_extcmd ("inw", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH, |
d8b5cd40 | 124 | N_("PORT"), N_("Read word from PORT."), options); |
e2a101ab | 125 | cmd_read_dword = |
165134bc | 126 | grub_register_extcmd ("inl", grub_cmd_read, GRUB_COMMAND_FLAG_BOTH, |
d8b5cd40 | 127 | N_("PORT"), N_("Read dword from PORT."), options); |
e2a101ab | 128 | cmd_write_byte = |
165134bc | 129 | grub_register_command ("outb", grub_cmd_write, |
d8b5cd40 VS |
130 | N_("PORT VALUE [MASK]"), |
131 | N_("Write byte VALUE to PORT.")); | |
e2a101ab | 132 | cmd_write_word = |
165134bc | 133 | grub_register_command ("outw", grub_cmd_write, |
d8b5cd40 VS |
134 | N_("PORT VALUE [MASK]"), |
135 | N_("Write word VALUE to PORT.")); | |
e2a101ab | 136 | cmd_write_dword = |
165134bc | 137 | grub_register_command ("outl", grub_cmd_write, |
d8b5cd40 VS |
138 | N_("ADDR VALUE [MASK]"), |
139 | N_("Write dword VALUE to PORT.")); | |
e2a101ab VS |
140 | } |
141 | ||
142 | GRUB_MOD_FINI(memrw) | |
143 | { | |
144 | grub_unregister_extcmd (cmd_read_byte); | |
145 | grub_unregister_extcmd (cmd_read_word); | |
146 | grub_unregister_extcmd (cmd_read_dword); | |
147 | grub_unregister_command (cmd_write_byte); | |
148 | grub_unregister_command (cmd_write_word); | |
149 | grub_unregister_command (cmd_write_dword); | |
150 | } |