lapic_cpu_stop.c File Reference

#include <console/console.h>
#include <cpu/x86/lapic.h>
#include <delay.h>
#include <halt.h>

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Macros
#define	DEBUG_HALT_SELF   0
	Sending INIT IPI to self is equivalent of asserting #INIT with a bit of delay. More...
#define	dprintk(LEVEL, args...)   do { } while (0)

Functions
static void	wait_for_ipi_completion_without_printk (const int timeout_ms)
void	stop_this_cpu (void)
	Normally this function is defined in lapic.h as an always inline function that just keeps the CPU in a hlt() loop. More...

Macro Definition Documentation

DEBUG_HALT_SELF

#define DEBUG_HALT_SELF   0

Sending INIT IPI to self is equivalent of asserting #INIT with a bit of delay.

An undefined number of instruction cycles will complete. All global locks must be released before INIT IPI and no printk is allowed after this. De-asserting INIT IPI is a no-op on later Intel CPUs.

If you set DEBUG_HALT_SELF to 1, printk's after INIT IPI are enabled but running thread may halt without releasing the lock and effectively deadlock other CPUs.

Definition at line 19 of file lapic_cpu_stop.c.

dprintk

#define dprintk	(		LEVEL,
			args...
	)		do { } while (0)

Definition at line 24 of file lapic_cpu_stop.c.

Function Documentation

stop_this_cpu()

void stop_this_cpu

(

void

)

Normally this function is defined in lapic.h as an always inline function that just keeps the CPU in a hlt() loop.

This does not work on all CPUs. I think all hyperthreading CPUs might need this version, but I could only verify this on the Intel Core Duo

Definition at line 50 of file lapic_cpu_stop.c.

References BIOS_DEBUG, BIOS_SPEW, dprintk, halt(), LAPIC_DM_INIT, LAPIC_INT_ASSERT, LAPIC_INT_LEVELTRIG, lapic_send_ipi_self(), lapicid(), mdelay(), printk, and wait_for_ipi_completion_without_printk().

Referenced by park_this_cpu(), and secondary_cpu_init().

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wait_for_ipi_completion_without_printk()

static void wait_for_ipi_completion_without_printk ( const int  timeout_ms )

static

Definition at line 27 of file lapic_cpu_stop.c.

References BIOS_ERR, BIOS_SPEW, dprintk, lapic_busy(), and udelay().

Referenced by stop_this_cpu().

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