A set of macros and functions which are used in the console driver and related code to access the screen buffer. In most cases the console works with simple in-memory buffer, but when handling hardware text mode consoles, we store the foreground console directly in video memory.
scr_writew, scr_readw
scr_writew(val, addr) writes the value val to the location pointed at by the pointer addr:
#define scr_writew(val, addr) (*(addr) = (val))
Similar idea:
#define scr_readw(addr) (*(addr))