AST2600_SEG_ADDR_MASK
u32 start_offset = (reg << 16) & AST2600_SEG_ADDR_MASK;
u32 end_offset = reg & AST2600_SEG_ADDR_MASK;
return ((start & AST2600_SEG_ADDR_MASK) >> 16) |
((end - 1) & AST2600_SEG_ADDR_MASK);