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2009-12-22 Vladimir Serbinenko <phcoder@gmail.com>

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* commands/memrw.c (grub_cmd_write): Support for mask parameter.
	(GRUB_MOD_INIT(memrw)): Update help line.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2009-12-22 17:00:28 +01:00
parent a34f5c705a
commit d3d30ea08e
2 changed files with 28 additions and 7 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2009-12-22 Vladimir Serbinenko <phcoder@gmail.com>
* commands/memrw.c (grub_cmd_write): Support for mask parameter.
(GRUB_MOD_INIT(memrw)): Update help line.
2009-12-22 Vladimir Serbinenko <phcoder@gmail.com> 2009-12-22 Vladimir Serbinenko <phcoder@gmail.com>
* commands/memrw.c (cmd_read_byte, cmd_read_word, cmd_read_dword): * commands/memrw.c (cmd_read_byte, cmd_read_word, cmd_read_dword):

30
commands/memrw.c
View file

@ -75,24 +75,40 @@ grub_cmd_write (grub_command_t cmd, int argc, char **argv)
{ {
grub_target_addr_t addr; grub_target_addr_t addr;
grub_uint32_t value; grub_uint32_t value;
grub_uint32_t mask = 0xffffffff;
if (argc != 2) if (argc != 2 && argc != 3)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments"); return grub_error (GRUB_ERR_BAD_ARGUMENT, "Invalid number of arguments");
addr = grub_strtoul (argv[0], 0, 0); addr = grub_strtoul (argv[0], 0, 0);
value = grub_strtoul (argv[1], 0, 0); value = grub_strtoul (argv[1], 0, 0);
if (argc == 3)
mask = grub_strtoul (argv[2], 0, 0);
value &= mask;
switch (cmd->name[sizeof ("write_") - 1]) switch (cmd->name[sizeof ("write_") - 1])
{ {
case 'd': case 'd':
*((volatile grub_uint32_t *) addr) = value; if (mask != 0xffffffff)
*((volatile grub_uint32_t *) addr)
= (*((volatile grub_uint32_t *) addr) & ~mask) | value;
else
*((volatile grub_uint32_t *) addr) = value;
break; break;
case 'w': case 'w':
*((volatile grub_uint16_t *) addr) = (grub_uint16_t) value; if ((mask & 0xffff) != 0xffff)
*((volatile grub_uint16_t *) addr)
= (*((volatile grub_uint16_t *) addr) & ~mask) | value;
else
*((volatile grub_uint16_t *) addr) = value;
break; break;
case 'b': case 'b':
*((volatile grub_uint8_t *) addr) = (grub_uint8_t) value; if ((mask & 0xff) != 0xff)
*((volatile grub_uint8_t *) addr)
= (*((volatile grub_uint8_t *) addr) & ~mask) | value;
else
*((volatile grub_uint8_t *) addr) = value;
break; break;
} }
@ -112,13 +128,13 @@ GRUB_MOD_INIT(memrw)
"read_dword ADDR", "Read dword from ADDR.", options); "read_dword ADDR", "Read dword from ADDR.", options);
cmd_write_byte = cmd_write_byte =
grub_register_command ("write_byte", grub_cmd_write, grub_register_command ("write_byte", grub_cmd_write,
"write_byte ADDR VALUE", "Write byte VALUE to ADDR."); "write_byte ADDR VALUE [MASK]", "Write byte VALUE to ADDR.");
cmd_write_word = cmd_write_word =
grub_register_command ("write_word", grub_cmd_write, grub_register_command ("write_word", grub_cmd_write,
"write_word ADDR VALUE", "Write word VALUE to ADDR."); "write_word ADDR VALUE [MASK]", "Write word VALUE to ADDR.");
cmd_write_dword = cmd_write_dword =
grub_register_command ("write_dword", grub_cmd_write, grub_register_command ("write_dword", grub_cmd_write,
"write_dword ADDR VALUE", "Write dword VALUE to ADDR."); "write_dword ADDR VALUE [MASK]", "Write dword VALUE to ADDR.");
} }
GRUB_MOD_FINI(memrw) GRUB_MOD_FINI(memrw)