HLT

In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react. For example, hardware timers send interrupts to the CPU at regular intervals.

The HLT instruction is executed by the operating system when there is no immediate work to be done, and the system enters its idle state. In Windows NT, for example, this instruction is run in the "System Idle Process". On x86 processors, the opcode of HLT is 0xF4.

History on x86

All x86 processors from the 8086 onwards had the HLT instruction, but it was not used by MS-DOS unless POWER.EXE is installed in the CONFIG.SYS and was not specifically designed to reduce power consumption until the release of the Intel DX4 processor in 1994. Some of the first 100 MHz DX chips had a buggy HLT state, prompting the developers of Linux to implement a "no-hlt" option for use when running on those chips, but this was fixed in later chips.

Podcasts:

PLAYLIST TIME:

Girls On Trampolines

by: Ludo

They page Party Guy, he pages them back with the number where's at, they let the phone ring
'Til Party Guy picks it up and says, "Behind Burger King"
Should they make another run? Their fake says they're 21, they're not sure they got enough, should they
go buy more stuff?
He says, "Forget about the stuff, they've got more than enough, they thought of everything," he says,
[Chorus]
"They've got more beer than he's ever seen
And they've got girls on trampolines
They tapped ten kegs since 9:15
And they've got girls on trampolines"
Quoth the Party Guy, he doesn't ever lie, it sounds like their scene, but they don't have a ride
So they call Ride Guy who comes by and with a sigh he lets them in his ride (Okay!)
And Drunk Guy tells Ride Guy to shut up and just drive when he asks about the stuff and about the thing
But Nice Guy kicks Drunk Guy and tells Ride Guy that Party Guy said it's party-time behind Burger King,
he says,
[Chorus]
But Nice Guy's talk of trampolines makes Drunk Guy turn green and he pukes on Jon Fee and Ride Guy's ride
hits a tree
Which causes Weed Guy to drop his seeds at the feet of Officer One, Officer Two and Officer Three
And Officer One says, "Looky here, son, I hate speeding MIP's who have seeds and hit trees,"
One and two wanted to beat 'em and kill 'em and eat 'em, but they deferred to Officer Three who said,
"I hear there's a shindig behind Burger King
And I hear there's girls on trampolines
The tree looks fine and the driver's clean
Just give them girls on trampolines"
God bless the wisdom of Officer Three




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