mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
db753bdfc2
>commit 76381fee7e
>Author: Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>
>Date: Thu Jun 23 00:08:46 2005 -0700
>
> [PATCH] xen: x86_64: use more usermode macro
>
> Make use of the user_mode macro where it's possible. This is useful for Xen
> because it will need only to redefine only the macro to a hypervisor call.
I am of the opinion that the above changeset is incomplete, i.e. it missed
converting some previous uses of user_mode to user_mode_vm. While most of
them could be considered just cosmetical, at least the one in die_nmi
doesn't appear to be.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
Cc: Vincent Hanquez <vincent.hanquez@cl.cam.ac.uk>
Cc: Zachary Amsden <zach@vmware.com>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* defines for inline arch setup functions */
|
|
|
|
#include <asm/apic.h>
|
|
#include <asm/i8259.h>
|
|
|
|
/**
|
|
* do_timer_interrupt_hook - hook into timer tick
|
|
* @regs: standard registers from interrupt
|
|
*
|
|
* Description:
|
|
* This hook is called immediately after the timer interrupt is ack'd.
|
|
* It's primary purpose is to allow architectures that don't possess
|
|
* individual per CPU clocks (like the CPU APICs supply) to broadcast the
|
|
* timer interrupt as a means of triggering reschedules etc.
|
|
**/
|
|
|
|
static inline void do_timer_interrupt_hook(struct pt_regs *regs)
|
|
{
|
|
do_timer(regs);
|
|
#ifndef CONFIG_SMP
|
|
update_process_times(user_mode_vm(regs));
|
|
#endif
|
|
/*
|
|
* In the SMP case we use the local APIC timer interrupt to do the
|
|
* profiling, except when we simulate SMP mode on a uniprocessor
|
|
* system, in that case we have to call the local interrupt handler.
|
|
*/
|
|
#ifndef CONFIG_X86_LOCAL_APIC
|
|
profile_tick(CPU_PROFILING, regs);
|
|
#else
|
|
if (!using_apic_timer)
|
|
smp_local_timer_interrupt(regs);
|
|
#endif
|
|
}
|
|
|
|
|
|
/* you can safely undefine this if you don't have the Neptune chipset */
|
|
|
|
#define BUGGY_NEPTUN_TIMER
|
|
|
|
/**
|
|
* do_timer_overflow - process a detected timer overflow condition
|
|
* @count: hardware timer interrupt count on overflow
|
|
*
|
|
* Description:
|
|
* This call is invoked when the jiffies count has not incremented but
|
|
* the hardware timer interrupt has. It means that a timer tick interrupt
|
|
* came along while the previous one was pending, thus a tick was missed
|
|
**/
|
|
static inline int do_timer_overflow(int count)
|
|
{
|
|
int i;
|
|
|
|
spin_lock(&i8259A_lock);
|
|
/*
|
|
* This is tricky when I/O APICs are used;
|
|
* see do_timer_interrupt().
|
|
*/
|
|
i = inb(0x20);
|
|
spin_unlock(&i8259A_lock);
|
|
|
|
/* assumption about timer being IRQ0 */
|
|
if (i & 0x01) {
|
|
/*
|
|
* We cannot detect lost timer interrupts ...
|
|
* well, that's why we call them lost, don't we? :)
|
|
* [hmm, on the Pentium and Alpha we can ... sort of]
|
|
*/
|
|
count -= LATCH;
|
|
} else {
|
|
#ifdef BUGGY_NEPTUN_TIMER
|
|
/*
|
|
* for the Neptun bug we know that the 'latch'
|
|
* command doesn't latch the high and low value
|
|
* of the counter atomically. Thus we have to
|
|
* substract 256 from the counter
|
|
* ... funny, isnt it? :)
|
|
*/
|
|
|
|
count -= 256;
|
|
#else
|
|
printk("do_slow_gettimeoffset(): hardware timer problem?\n");
|
|
#endif
|
|
}
|
|
return count;
|
|
}
|