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About Linux glue sofware interrupts. [PATCH]
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From: |
Gianluca Guida |
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Subject: |
About Linux glue sofware interrupts. [PATCH] |
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Date: |
Wed, 1 Feb 2006 06:28:51 +0100 |
Hello,
Current GNU Mach provides Linux's "software interrupts" (bottom
halves) by calling 'linux_soft_intr' during spl switches and Linux's
schedule() call.
However, Mach has support for software interrupts or similar,
obscurely called 'ASTs' (see kern/ast.c).
This patch make the glue use Mach AST's and remove the invasive (IMHO)
SPL's hacks and let schedule() just block the thread, not making it
deal with software interrupts.
Testing and feedback, as always, would be gratly appreciated!
Thanks,
Gianluca
2006-02-01 Gianluca Guida <glguida@gmail.com>
* i386/i386/spl.S (spl0) [LINUX_DEV]: Removed linux glue dependant
code for calling linux_soft_intr.
(splx_cli) [LINUX_DEV]: Likewise.
* kern/ast.h (AST_LINUX20): New macro.
* kern/ast.c (ast_taken): Call linux_ast() on AST_LINUX20 reason.
* linux/dev/kernel/sched.c (handle_soft_intr): Function removed.
(schedule): Do not call handle_soft_intr() anymore.
* linux/dev/kenrel/softirq.c (linux_soft_intr): Changed name into ...
(linux_ast): ... this.
* linux/src/include/linux/interrupt.h: Include <kern/ast.h>.
(mark_bh): Call ast_on() with reason AST_LINUX20.
diff -ru gnumach-vanilla/i386/i386/spl.S
gnumach-lessglueisbetter/i386/i386/spl.S
--- gnumach-vanilla/i386/i386/spl.S 1997-02-25 22:27:11.000000000 +0100
+++ gnumach-lessglueisbetter/i386/i386/spl.S 2006-01-28 04:12:00.000000000
+0100
@@ -55,18 +55,6 @@
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 */
@@ -146,18 +134,6 @@
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 */
diff -ru gnumach-vanilla/kern/ast.c gnumach-lessglueisbetter/kern/ast.c
--- gnumach-vanilla/kern/ast.c 2001-04-05 08:39:20.000000000 +0200
+++ gnumach-lessglueisbetter/kern/ast.c 2006-01-27 17:02:19.000000000 +0100
@@ -54,7 +54,7 @@
#include <mach/policy.h>
#endif /* MACH_FIXPRI */
-
+extern void linux_ast();
volatile ast_t need_ast[NCPUS];
void
@@ -90,6 +90,9 @@
if (reasons & AST_NETWORK)
net_ast();
+ if (reasons & AST_LINUX20)
+ linux_ast();
+
#if NORMA_IPC
if (reasons & AST_NETIPC)
netipc_ast();
diff -ru gnumach-vanilla/kern/ast.h gnumach-lessglueisbetter/kern/ast.h
--- gnumach-vanilla/kern/ast.h 2001-04-05 08:39:20.000000000 +0200
+++ gnumach-lessglueisbetter/kern/ast.h 2006-01-27 17:01:53.000000000 +0100
@@ -56,7 +56,8 @@
#define AST_BLOCK 0x4
#define AST_NETWORK 0x8
#define AST_NETIPC 0x10
+#define AST_LINUX20 0x20
#define AST_SCHEDULING (AST_HALT|AST_TERMINATE|AST_BLOCK)
diff -ru gnumach-vanilla/linux/dev/kernel/sched.c
gnumach-lessglueisbetter/linux/dev/kernel/sched.c
--- gnumach-vanilla/linux/dev/kernel/sched.c 1999-04-26 07:49:38.000000000
+0200
+++ gnumach-lessglueisbetter/linux/dev/kernel/sched.c 2006-01-27
18:29:28.000000000 +0100
@@ -51,7 +51,6 @@
extern void free_contig_mem (vm_page_t);
extern spl_t splhigh (void);
extern spl_t splx (spl_t);
-extern void linux_soft_intr (void);
extern int issig (void);
extern int printf (const char *, ...);
extern int linux_auto_config;
@@ -64,17 +63,6 @@
static struct wait_queue **auto_config_queue;
-static inline void
-handle_soft_intr (void)
-{
- if (bh_active & bh_mask)
- {
- intr_count = 1;
- linux_soft_intr ();
- intr_count = 0;
- }
-}
-
static void
tqueue_bh (void)
{
@@ -318,7 +306,6 @@
printk ("Aiee: scheduling in interrupt %p\n",
__builtin_return_address (0));
- handle_soft_intr ();
run_task_queue (&tq_scheduler);
if (!linux_auto_config)
@@ -635,8 +622,4 @@
mark_bh (TIMER_BH);
if (tq_timer)
mark_bh (TQUEUE_BH);
-#if 0
- if (linux_timer_print)
- printf ("linux_timer_intr: pic_mask[0] %x\n", pic_mask[0]);
-#endif
}
diff -ru gnumach-vanilla/linux/dev/kernel/softirq.c
gnumach-lessglueisbetter/linux/dev/kernel/softirq.c
--- gnumach-vanilla/linux/dev/kernel/softirq.c 1999-04-26
07:49:38.000000000 +0200
+++ gnumach-lessglueisbetter/linux/dev/kernel/softirq.c 2006-01-27
15:58:33.000000000 +0100
@@ -19,7 +19,7 @@
void (*bh_base[32]) (void);
void
-linux_soft_intr (void)
+linux_ast (void)
{
unsigned long active;
unsigned long mask, left;
diff -ru gnumach-vanilla/linux/src/include/linux/interrupt.h
gnumach-lessglueisbetter/linux/src/include/linux/interrupt.h
--- gnumach-vanilla/linux/src/include/linux/interrupt.h 1999-04-26
07:56:35.000000000 +0200
+++ gnumach-lessglueisbetter/linux/src/include/linux/interrupt.h
2006-01-27
17:08:54.000000000 +0100
@@ -2,6 +2,7 @@
#ifndef _LINUX_INTERRUPT_H
#define _LINUX_INTERRUPT_H
+#include <kern/ast.h>
#include <linux/kernel.h>
#include <asm/bitops.h>
@@ -53,6 +54,7 @@
extern inline void mark_bh(int nr)
{
set_bit(nr, &bh_active);
+ ast_on (cpu_number(), AST_LINUX20);
}
/*
--
It was a type of people I did not know, I found them very strange and
they did not inspire confidence at all. Later I learned that I had been
introduced to electronic engineers.
E. W. Dijkstra
- About Linux glue sofware interrupts. [PATCH],
Gianluca Guida <=