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common/memsize.c: Simplify RAM size detection

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The case of memory of size 0 is not that different from a memory of any other
size, so we remove the duplicate code and treat the small differences when it
is the case.

Signed-off-by: Eddy Petrișor <eddy.petrisor@gmail.com>
This commit is contained in:
Eddy Petrișor 2016-02-02 22:15:28 +02:00 committed by Tom Rini
parent ab8dd5e6e6
commit 8e7cba048b
1 changed files with 21 additions and 26 deletions
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47
common/memsize.c
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@ -33,38 +33,28 @@ long get_ram_size(long *base, long maxsize)
long size;
int i = 0;
for (cnt = (maxsize / sizeof(long)) >> 1; cnt > 0; cnt >>= 1) {
for (cnt = (maxsize / sizeof(long)) >> 1; cnt >= 0; cnt >>= 1) {
addr = base + cnt; /* pointer arith! */
sync();
save[i++] = *addr;
save[i] = *addr;
sync();
*addr = ~cnt;
}
addr = base;
sync();
save[i] = *addr;
sync();
*addr = 0;
sync();
if ((val = *addr) != 0) {
/* Restore the original data before leaving the function. */
sync();
*addr = save[i];
for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
addr = base + cnt;
sync();
*addr = save[--i];
if (cnt) {
i++;
*addr = ~cnt;
} else {
*addr = 0;
}
return (0);
}
for (cnt = 1; cnt < maxsize / sizeof(long); cnt <<= 1) {
sync();
cnt = 0;
do {
addr = base + cnt; /* pointer arith! */
val = *addr;
*addr = save[--i];
if (val != ~cnt) {
*addr = save[i--];
sync();
if (((cnt == 0) && (val != 0)) ||
((cnt != 0) && (val != ~cnt))) {
size = cnt * sizeof(long);
/*
* Restore the original data
@ -74,11 +64,16 @@ long get_ram_size(long *base, long maxsize)
cnt < maxsize / sizeof(long);
cnt <<= 1) {
addr = base + cnt;
*addr = save[--i];
*addr = save[i--];
}
return (size);
}
}
if (cnt)
cnt = cnt << 1;
else
cnt = 1;
} while (cnt < maxsize / sizeof(long));
return (maxsize);
}