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/*
* Copyright (c) 1995 Shantanu Goel
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* THE AUTHOR ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. THE AUTHOR DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*/
/*
* spl routines for the i386at.
*/
#include <mach/machine/asm.h>
#include <i386/ipl.h>
#include <i386/i386asm.h>
#include <i386/xen.h>
#if NCPUS > 1
#define mb lock; addl $0,(%esp)
#else
#define mb
#endif
/*
* Program XEN evt masks from %eax.
*/
#define XEN_SETMASK() \
pushl %ebx; \
movl %eax,%ebx; \
xchgl %eax,hyp_shared_info+EVTMASK; \
notl %ebx; \
andl %eax,%ebx; /* Get unmasked events */ \
testl hyp_shared_info+PENDING, %ebx; \
popl %ebx; \
jz 9f; /* Check whether there was some pending */ \
lock orl $1,hyp_shared_info+CPU_PENDING_SEL; /* Yes, activate it */ \
movb $1,hyp_shared_info+CPU_PENDING; \
9:
ENTRY(spl0)
mb;
movl EXT(curr_ipl),%eax /* save current ipl */
pushl %eax
cli /* disable interrupts */
#ifdef LINUX_DEV
movl EXT(bh_active),%eax
/* get pending mask */
andl EXT(bh_mask),%eax /* any pending unmasked interrupts? */
jz 1f /* no, skip */
call EXT(spl1) /* block further interrupts */
incl EXT(intr_count) /* set interrupt flag */
call EXT(linux_soft_intr) /* go handle interrupt */
decl EXT(intr_count) /* decrement interrupt flag */
cli /* disable interrupts */
1:
#endif
cmpl $0,softclkpending /* softclock pending? */
je 1f /* no, skip */
movl $0,softclkpending /* clear flag */
call EXT(spl1) /* block further interrupts */
#ifdef LINUX_DEV
incl EXT(intr_count) /* set interrupt flag */
#endif
call EXT(softclock) /* go handle interrupt */
#ifdef LINUX_DEV
decl EXT(intr_count) /* decrement interrupt flag */
#endif
cli /* disable interrupts */
1:
cmpl $(SPL0),EXT(curr_ipl) /* are we at spl0? */
je 1f /* yes, all done */
movl $(SPL0),EXT(curr_ipl) /* set ipl */
#ifdef MACH_XEN
movl EXT(int_mask)+SPL0*4,%eax
/* get xen mask */
XEN_SETMASK() /* program xen evts */
#endif
1:
sti /* enable interrupts */
popl %eax /* return previous mask */
ret
/*
* Historically, SETIPL(level) was called
* for spl levels 1-6, now we have combined
* all the intermediate levels into the highest level
* such that interrupts are either on or off,
* since modern hardware can handle it.
* This simplifies the interrupt handling
* especially for the linux drivers.
*/
Entry(splsoftclock)
ENTRY(spl1)
ENTRY(spl2)
ENTRY(spl3)
Entry(splnet)
Entry(splhdw)
ENTRY(spl4)
Entry(splbio)
Entry(spldcm)
ENTRY(spl5)
Entry(spltty)
Entry(splimp)
Entry(splvm)
ENTRY(spl6)
Entry(splclock)
Entry(splsched)
Entry(splhigh)
Entry(splhi)
ENTRY(spl7)
mb;
/* just clear IF */
cli
movl $SPL7,%eax
xchgl EXT(curr_ipl),%eax
ret
ENTRY(splx)
movl S_ARG0,%edx /* get ipl */
#if (MACH_KDB || MACH_TTD) && !defined(MACH_XEN)
/* First make sure that if we're exitting from ipl7, IF is still cleared */
cmpl $SPL7,EXT(curr_ipl) /* from ipl7? */
jne 0f
pushfl
popl %eax
testl $0x200,%eax /* IF? */
jz 0f
int3 /* Oops, interrupts got enabled?! */
0:
#endif /* (MACH_KDB || MACH_TTD) && !MACH_XEN */
testl %edx,%edx /* spl0? */
jz EXT(spl0) /* yes, handle specially */
cmpl EXT(curr_ipl),%edx /* same ipl as current? */
jne spl /* no */
cmpl $SPL7,%edx /* spl7? */
je 1f /* to ipl7, don't enable interrupts */
sti /* ensure interrupts are enabled */
1:
movl %edx,%eax /* return previous ipl */
ret
/*
* Like splx() but returns with interrupts disabled and does
* not return the previous ipl. This should only be called
* when returning from an interrupt.
*/
.align TEXT_ALIGN
.globl splx_cli
splx_cli:
movl S_ARG0,%edx /* get ipl */
cli /* disable interrupts */
testl %edx,%edx /* spl0? */
jnz 2f /* no, skip */
#ifdef LINUX_DEV
movl EXT(bh_active),%eax
/* get pending mask */
andl EXT(bh_mask),%eax /* any pending unmasked interrupts? */
jz 1f /* no, skip */
call EXT(spl1) /* block further interrupts */
incl EXT(intr_count) /* set interrupt flag */
call EXT(linux_soft_intr) /* go handle interrupt */
decl EXT(intr_count) /* decrement interrupt flag */
cli /* disable interrupts */
1:
#endif
cmpl $0,softclkpending /* softclock pending? */
je 1f /* no, skip */
movl $0,softclkpending /* clear flag */
call EXT(spl1) /* block further interrupts */
#ifdef LINUX_DEV
incl EXT(intr_count) /* set interrupt flag */
#endif
call EXT(softclock) /* go handle interrupt */
#ifdef LINUX_DEV
decl EXT(intr_count) /* decrement interrupt flag */
#endif
cli /* disable interrupts */
1:
xorl %edx,%edx /* edx = ipl 0 */
2:
cmpl EXT(curr_ipl),%edx /* same ipl as current? */
je 1f /* yes, all done */
movl %edx,EXT(curr_ipl) /* set ipl */
#ifdef MACH_XEN
movl EXT(int_mask)(,%edx,4),%eax
/* get int mask */
XEN_SETMASK() /* program xen evts with new mask */
#endif
1:
ret
/*
* NOTE: This routine must *not* use %ecx, otherwise
* the interrupt code will break.
*/
.align TEXT_ALIGN
.globl spl
spl:
#if (MACH_KDB || MACH_TTD) && !defined(MACH_XEN)
/* First make sure that if we're exitting from ipl7, IF is still cleared */
cmpl $SPL7,EXT(curr_ipl) /* from ipl7? */
jne 0f
pushfl
popl %eax
testl $0x200,%eax /* IF? */
jz 0f
int3 /* Oops, interrupts got enabled?! */
0:
#endif /* (MACH_KDB || MACH_TTD) && !MACH_XEN */
cmpl $SPL7,%edx /* spl7? */
je EXT(spl7) /* yes, handle specially */
#ifdef MACH_XEN
movl EXT(int_mask)(,%edx,4),%eax
/* get int mask */
#endif
cli /* disable interrupts */
xchgl EXT(curr_ipl),%edx /* set ipl */
#ifdef MACH_XEN
XEN_SETMASK() /* program PICs with new mask */
#endif
sti /* enable interrupts */
movl %edx,%eax /* return previous ipl */
ret
ENTRY(sploff)
pushfl
popl %eax
cli
ret
ENTRY(splon)
pushl 4(%esp)
popfl
ret
.data
.align DATA_ALIGN
softclkpending:
.long 0
.text
ENTRY(setsoftclock)
incl softclkpending
ret
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