util/nvmutil: greatly optimise cmd_swap()
instead of XOR-swapping every byte, have pointers to the two parts and *XOR swap the pointers*. at the end of the program execution, when writing, pwrite the two parts into the same filefsdg20230625
parent
7aafc62bf7
commit
6e5828e4a8
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@ -57,7 +57,7 @@ void writeGbeFile(int *fd, const char *filename);
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#define SIZE_4KB 0x1000
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#define SIZE_4KB 0x1000
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#define SIZE_8KB 0x2000
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#define SIZE_8KB 0x2000
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uint8_t gbe[SIZE_8KB];
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uint8_t *gbe = NULL, *gbe2 = NULL;
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int part, gbeFileModified = 0;
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int part, gbeFileModified = 0;
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uint8_t nvmPartModified[2];
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uint8_t nvmPartModified[2];
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@ -73,6 +73,10 @@ main(int argc, char *argv[])
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char *strRMac = "??:??:??:??:??:??";
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char *strRMac = "??:??:??:??:??:??";
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void (*cmd)(void) = NULL;
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void (*cmd)(void) = NULL;
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if ((gbe = (uint8_t *) malloc(SIZE_8KB)) == NULL)
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err(errno, NULL);
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gbe2 = gbe + SIZE_4KB;
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nvmPartModified[0] = 0;
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nvmPartModified[0] = 0;
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nvmPartModified[1] = 0;
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nvmPartModified[1] = 0;
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@ -351,16 +355,18 @@ void
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cmd_swap(void)
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cmd_swap(void)
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{
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{
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int part0, part1;
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int part0, part1;
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size_t g1 = (size_t) gbe;
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size_t g2 = (size_t) gbe2;
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part0 = validChecksum(0);
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part0 = validChecksum(0);
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part1 = validChecksum(1);
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part1 = validChecksum(1);
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if (part0 || part1) {
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if (part0 || part1) {
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for(part0 = 0; part0 < SIZE_4KB; part0++) {
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g1 ^= g2;
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gbe[part0] ^= gbe[part1 = (part0 | SIZE_4KB)];
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g2 ^= g1;
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gbe[part1] ^= gbe[part0];
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g1 ^= g2;
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gbe[part0] ^= gbe[part1];
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gbe = (uint8_t *) g1;
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}
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gbe2 = (uint8_t *) g2;
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gbeFileModified = 1;
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gbeFileModified = 1;
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nvmPartModified[0] = 1;
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nvmPartModified[0] = 1;
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@ -438,7 +444,10 @@ writeGbeFile(int *fd, const char *filename)
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int partnum;
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int partnum;
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errno = 0;
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errno = 0;
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if (pwrite((*fd), gbe, SIZE_8KB, 0) == SIZE_8KB)
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if (pwrite((*fd), gbe, SIZE_4KB, 0) != SIZE_4KB)
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err(errno, "%s", filename);
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if (pwrite((*fd), gbe2, SIZE_4KB, SIZE_4KB) != SIZE_4KB)
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err(errno, "%s", filename);
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if (close((*fd)))
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if (close((*fd)))
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err(errno, "%s", filename);
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err(errno, "%s", filename);
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if (errno != 0)
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if (errno != 0)
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