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util/nvmutil: store invert in command struct

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handle inversion directly there

Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-08 00:21:58 +00:00
parent 50e20fb8bf
commit 698d39dd06
1 changed files with 14 additions and 27 deletions
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util/nvmutil/nvmutil.c
+14 -27
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@@ -38,7 +38,7 @@ static void open_dev_urandom(void);
#endif
static void xopen(int *fd, const char *path, int flags, struct stat *st);
static void read_gbe_file(void);
static void read_gbe_file_part(size_t part, uint8_t invert);
static void read_gbe_file_part(size_t part);
static void cmd_setmac(void);
static void parse_mac_string(void);
static void set_mac_byte(size_t mac_byte_pos);
@@ -140,7 +140,6 @@ static int urandom_fd = -1;
#endif
static int gbe_fd = -1;
static size_t part;
static uint8_t invert;
static uint8_t part_modified[2];
static const char *mac_str;
@@ -152,14 +151,15 @@ struct commands {
const char *str;
void (*run)(void);
int args;
uint8_t invert;
};
static const struct commands command[] = {
{ "dump", cmd_dump, 3 },
{ "setmac", cmd_setmac, 3 },
{ "swap", cmd_swap, 3 },
{ "copy", cmd_copy, 4 },
{ "brick", cmd_brick, 4 },
{ "setchecksum", cmd_setchecksum, 4 },
{ "dump", cmd_dump, 3, 0 },
{ "setmac", cmd_setmac, 3, 0 },
{ "swap", cmd_swap, 3, 1 },
{ "copy", cmd_copy, 4, 1 },
{ "brick", cmd_brick, 4, 0 },
{ "setchecksum", cmd_setchecksum, 4, 0 },
};
#define CMD_NULL -1
#define CMD_DUMP 0
@@ -441,31 +441,18 @@ read_gbe_file(void)
cmd == CMD_SETCHECKSUM)
do_read[part ^ 1] = 0;
/*
* SPEED HACK:
*
* On copy/swap commands, flip where data gets written to memory,
* so that cmd_copy and cmd_swap don't have to work on every word
*
* NOTE:
*
* write_gbe_file() will not use this, but copy/setchecksum commands
* will directly manipulate part_modified[], telling write_gbe_file()
* to also write in reverse, as in read_gbe_file().
*/
if (cmd == CMD_COPY || cmd == CMD_SWAP)
invert = 1;
for (p = 0; p < 2; p++) {
if (do_read[p])
read_gbe_file_part(p, invert);
read_gbe_file_part(p);
}
}
static void
read_gbe_file_part(size_t p, uint8_t invert)
read_gbe_file_part(size_t p)
{
read_file_exact(gbe_fd, gbe_mem_offset(p ^ invert, "pread"),
void *mem_offset = gbe_mem_offset(p ^ command[cmd].invert, "pread");
read_file_exact(gbe_fd, mem_offset,
GBE_PART_SIZE, gbe_file_offset(p, "pread"), fname, "pread");
}
@@ -794,7 +781,7 @@ good_checksum(size_t partnum)
return 1;
fprintf(stderr, "WARNING: BAD checksum in part %zu\n",
partnum ^ invert);
partnum ^ command[cmd].invert);
set_err(ECANCELED);
return 0;