diff options
Diffstat (limited to 'common/memsize.c')
| -rw-r--r-- | common/memsize.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/common/memsize.c b/common/memsize.c index d5d13d51bf..3c80ad2c83 100644 --- a/common/memsize.c +++ b/common/memsize.c @@ -94,11 +94,23 @@ long get_ram_size(long *base, long maxsize) phys_size_t __weak get_effective_memsize(void) { -#ifndef CONFIG_VERY_BIG_RAM - return gd->ram_size; + phys_size_t ram_size = gd->ram_size; + + /* + * Check for overflow and limit ram size to some representable value. + * It is required that ram_base + ram_size must be representable by + * phys_size_t type and must be aligned by direct access, therefore + * calculate it from last 4kB sector which should work as alignment + * on any platform. + */ + if (gd->ram_base + ram_size < gd->ram_base) + ram_size = ((phys_size_t)~0xfffULL) - gd->ram_base; + +#ifndef CONFIG_MAX_MEM_MAPPED + return ram_size; #else /* limit stack to what we can reasonable map */ - return ((gd->ram_size > CONFIG_MAX_MEM_MAPPED) ? - CONFIG_MAX_MEM_MAPPED : gd->ram_size); + return ((ram_size > CONFIG_MAX_MEM_MAPPED) ? + CONFIG_MAX_MEM_MAPPED : ram_size); #endif } |