Programming :: Initializing The SS Register (Intel Architecture)?

Kernel 2.6.21.5, slackware 12.0 as 2.17 [I am speaking here about 80x86 processors, with their segment registers SS, DS, CS, ES.] In a source file for as, I wrote

Code:

.section _STACK
.rept 4096
.word 0
.endr

Now, in the .text section, I want to initialize SS, the stack segment, to point to the _STACK section. In other assemblers, there was a special section for the stack, and the linker cared about initializing SS. Here I use a common section for the stack. For a segment such as DS, I could write

mov ax,_DATA
mov ds,ax

But I don't think mov ax,_STACK would do with as/ls.how do I initialize SS?