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util/nvmutil: make defines easier to understand

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Signed-off-by: Leah Rowe <leah@libreboot.org>
This commit is contained in:
Leah Rowe
2026-03-06 17:44:07 +00:00
parent edca6c2cd3
commit b1abef8881
1 changed files with 43 additions and 13 deletions
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util/nvmutil/nvmutil.c
+43 -13
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@@ -52,6 +52,12 @@ static void err(int, const char *, ...);
static const char *getnvmprogname(void);
static void set_err(int);
/*
* On the platforms below, we will use arc4random
* for random MAC address generation.
*
* Later on, the code has fallbacks for other systems.
*/
#if defined(__OpenBSD__) || defined(__FreeBSD__) || \
defined(__NetBSD__) || defined(__APPLE__) || \
defined(__DragonFly__)
@@ -60,19 +66,43 @@ static void set_err(int);
#endif
#endif
#define NVM_CHECKSUM 0xBABA
#define NVM_SIZE 128
#define NVM_WORDS (NVM_SIZE / 2)
#define NVM_CHECKSUM_WORD (NVM_WORDS - 1)
/*
* Sizes in bytes:
*/
#define SIZE_1KB 1024
#define SIZE_4KB (4 * SIZE_1KB)
#define SIZE_8KB (8 * SIZE_1KB)
#define SIZE_16KB (16 * SIZE_1KB)
#define SIZE_128KB (128 * SIZE_1KB)
/*
* First 128 bytes of a GbE part contains
* the regular NVM (Non-Volatile-Memory)
* area. All of these bytes must add up,
* truncated to 0xBABA.
*
* The full GbE region is 4KB, but only
* the first 128 bytes are used here.
*
* There is a second 4KB part with the same
* rules, and it *should* be identical.
*/
#define GBE_PART_SIZE SIZE_4KB
#define NVM_CHECKSUM 0xBABA
#define NVM_SIZE 128
#define NVM_WORDS (NVM_SIZE / 2)
#define NVM_CHECKSUM_WORD (NVM_WORDS - 1)
/*
* When reading files, we loop on error EINTR
* a maximum number of defined defined thus:
*/
#define MAX_RETRY_READ 30
/*
* Portably macro based on BSD nitems.
* Used to count the number of commands (see below).
*/
#define items(x) (sizeof((x)) / sizeof((x)[0]))
static const char newrandom[] = "/dev/urandom";
@@ -338,8 +368,8 @@ read_gbe(void)
static void
read_gbe_part(int p, int invert)
{
read_file_PERFECTLY_or_die(fd, buf + (SIZE_4KB * (p ^ invert)),
SIZE_4KB, gbe_bound(p, "pread"), fname, "pread");
read_file_PERFECTLY_or_die(fd, buf + (GBE_PART_SIZE * (p ^ invert)),
GBE_PART_SIZE, gbe_bound(p, "pread"), fname, "pread");
}
static void
@@ -682,7 +712,7 @@ word(size_t pos16, int p)
size_t pos;
check_bound(pos16, p);
pos = (pos16 << 1) + ((size_t)p * SIZE_4KB);
pos = (pos16 << 1) + ((size_t)p * GBE_PART_SIZE);
return (uint16_t)buf[pos] | ((uint16_t)buf[pos + 1] << 8);
}
@@ -693,7 +723,7 @@ set_word(size_t pos16, int p, uint16_t val16)
size_t pos;
check_bound(pos16, p);
pos = (pos16 << 1) + ((size_t)p * SIZE_4KB);
pos = (pos16 << 1) + ((size_t)p * GBE_PART_SIZE);
buf[pos] = (uint8_t)(val16 & 0xff);
buf[pos + 1] = (uint8_t)(val16 >> 8);
@@ -741,10 +771,10 @@ write_gbe(void)
static void
write_gbe_part(int p)
{
if (pwrite(fd, buf + (SIZE_4KB * p),
SIZE_4KB, gbe_bound(p, "pwrite")) != (ssize_t)SIZE_4KB) {
if (pwrite(fd, buf + (GBE_PART_SIZE * p),
GBE_PART_SIZE, gbe_bound(p, "pwrite")) != GBE_PART_SIZE) {
err(ECANCELED,
"Can't write %d b to '%s' p%d", SIZE_4KB, fname, p);
"Can't write %d b to '%s' p%d", GBE_PART_SIZE, fname, p);
}
}
@@ -761,7 +791,7 @@ gbe_bound(int p, const char *f_op)
{
off_t off = (off_t)p * partsize;
if (off + SIZE_4KB > st.st_size)
if (off + GBE_PART_SIZE > st.st_size)
err(ECANCELED, "GbE file %s out of bounds: %s", f_op, fname);
if (off != 0 && off != st.st_size >> 1)