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Working code to call the PXE stack from within the ISR.

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This commit is contained in:
Michael Brown
2007-07-10 04:21:24 +01:00
parent 976a8514cb
commit 027fed72c1
2 changed files with 92 additions and 19 deletions
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41
src/arch/i386/drivers/net/undinet.c
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@@ -146,7 +146,7 @@ static union u_PXENV_ANY __data16 ( undinet_params );
* Used as the indirection vector for all UNDI API calls. Resides in
* base memory.
*/
static SEGOFF16_t __data16 ( undinet_entry_point );
SEGOFF16_t __data16 ( undinet_entry_point );
#define undinet_entry_point __use_data16 ( undinet_entry_point )
/**
@@ -245,17 +245,21 @@ static int undinet_call ( struct undi_nic *undinic, unsigned int function,
/**
* UNDI interrupt service routine
*
* The UNDI ISR simply increments a counter (@c trigger_count) and
* exits.
* The UNDI ISR increments a counter (@c trigger_count) and exits.
*/
extern void undinet_isr ( void );
extern void undiisr ( void );
/** Dummy chain vector */
static struct segoff prev_handler[ IRQ_MAX + 1 ];
/** IRQ number */
uint8_t __data16 ( undiisr_irq );
#define undiisr_irq __use_data16 ( undiisr_irq )
/** IRQ chain vector */
struct segoff __data16 ( undiisr_next_handler );
#define undiisr_next_handler __use_data16 ( undiisr_next_handler )
/** IRQ trigger count */
static volatile uint8_t __text16 ( trigger_count ) = 0;
#define trigger_count __use_text16 ( trigger_count )
volatile uint8_t __data16 ( undiisr_trigger_count ) = 0;
#define undiisr_trigger_count __use_data16 ( undiisr_trigger_count )
/** Last observed trigger count */
static unsigned int last_trigger_count = 0;
@@ -275,16 +279,12 @@ static unsigned int last_trigger_count = 0;
static void undinet_hook_isr ( unsigned int irq ) {
assert ( irq <= IRQ_MAX );
assert ( undiisr_irq == 0 );
__asm__ __volatile__ ( TEXT16_CODE ( "\nundinet_isr:\n\t"
"incb %%cs:%c0\n\t"
"iret\n\t" )
: : "p" ( & __from_text16 ( trigger_count ) ) );
undiisr_irq = irq;
hook_bios_interrupt ( IRQ_INT ( irq ),
( ( unsigned int ) undinet_isr ),
&prev_handler[irq] );
( ( unsigned int ) undiisr ),
&undiisr_next_handler );
}
/**
@@ -297,8 +297,9 @@ static void undinet_unhook_isr ( unsigned int irq ) {
assert ( irq <= IRQ_MAX );
unhook_bios_interrupt ( IRQ_INT ( irq ),
( ( unsigned int ) undinet_isr ),
&prev_handler[irq] );
( ( unsigned int ) undiisr ),
&undiisr_next_handler );
undiisr_irq = 0;
}
/**
@@ -310,7 +311,7 @@ static int undinet_isr_triggered ( void ) {
unsigned int this_trigger_count;
/* Read trigger_count. Do this only once; it is volatile */
this_trigger_count = trigger_count;
this_trigger_count = undiisr_trigger_count;
if ( this_trigger_count == last_trigger_count ) {
/* Not triggered */
@@ -424,6 +425,7 @@ static void undinet_poll ( struct net_device *netdev ) {
if ( ! undinet_isr_triggered() )
return;
#if 0
/* See if this was our interrupt */
memset ( &undi_isr, 0, sizeof ( undi_isr ) );
undi_isr.FuncFlag = PXENV_UNDI_ISR_IN_START;
@@ -443,6 +445,7 @@ static void undinet_poll ( struct net_device *netdev ) {
/* If this wasn't our interrupt, exit now */
if ( undi_isr.FuncFlag != PXENV_UNDI_ISR_OUT_OURS )
return;
#endif
/* Start ISR processing */
undinic->isr_processing = 1;