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Something long overdue: compile inb() and outb() into the kernel as

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functions if DDB is available.  The remaining occurences are usually
only inlined and thus not available in DDB.

I'm sure Bruce will have 23 additions to these 30 lines of code, but
at least it's a starting point. ;-)
This commit is contained in:
Joerg Wunsch 1997-03-28 12:37:44 +00:00
parent 58d6cb893a
commit 403d7829ac
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=24342
2 changed files with 94 additions and 2 deletions
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48
sys/amd64/amd64/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.231 1997/03/24 11:23:29 bde Exp $
* $Id: machdep.c,v 1.232 1997/03/25 23:43:01 mpp Exp $
*/
#include "npx.h"
@ -1529,3 +1529,49 @@ bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
bp->b_flags |= B_ERROR;
return(-1);
}
#ifdef DDB
/*
* Provide inb() and outb() as functions. They are normally only
* available as macros calling inlined functions, thus cannot be
* called inside DDB.
*
* The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
*/
#undef inb
#undef outb
/* silence compiler warnings */
u_char inb(u_int);
void outb(u_int, u_char);
u_char
inb(u_int port)
{
u_char data;
/*
* We use %%dx and not %1 here because i/o is done at %dx and not at
* %edx, while gcc generates inferior code (movw instead of movl)
* if we tell it to load (u_short) port.
*/
__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
return (data);
}
void
outb(u_int port, u_char data)
{
u_char al;
/*
* Use an unnecessary assignment to help gcc's register allocator.
* This make a large difference for gcc-1.40 and a tiny difference
* for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
* best results. gcc-2.6.0 can't handle this.
*/
al = data;
__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
}
#endif /* DDB */

48
sys/i386/i386/machdep.c
View File

@ -35,7 +35,7 @@
* SUCH DAMAGE.
*
* from: @(#)machdep.c 7.4 (Berkeley) 6/3/91
* $Id: machdep.c,v 1.231 1997/03/24 11:23:29 bde Exp $
* $Id: machdep.c,v 1.232 1997/03/25 23:43:01 mpp Exp $
*/
#include "npx.h"
@ -1529,3 +1529,49 @@ bounds_check_with_label(struct buf *bp, struct disklabel *lp, int wlabel)
bp->b_flags |= B_ERROR;
return(-1);
}
#ifdef DDB
/*
* Provide inb() and outb() as functions. They are normally only
* available as macros calling inlined functions, thus cannot be
* called inside DDB.
*
* The actual code is stolen from <machine/cpufunc.h>, and de-inlined.
*/
#undef inb
#undef outb
/* silence compiler warnings */
u_char inb(u_int);
void outb(u_int, u_char);
u_char
inb(u_int port)
{
u_char data;
/*
* We use %%dx and not %1 here because i/o is done at %dx and not at
* %edx, while gcc generates inferior code (movw instead of movl)
* if we tell it to load (u_short) port.
*/
__asm __volatile("inb %%dx,%0" : "=a" (data) : "d" (port));
return (data);
}
void
outb(u_int port, u_char data)
{
u_char al;
/*
* Use an unnecessary assignment to help gcc's register allocator.
* This make a large difference for gcc-1.40 and a tiny difference
* for gcc-2.6.0. For gcc-1.40, al had to be ``asm("ax")'' for
* best results. gcc-2.6.0 can't handle this.
*/
al = data;
__asm __volatile("outb %0,%%dx" : : "a" (al), "d" (port));
}
#endif /* DDB */