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[pxe] Create pxe_[de]activate() wrapper functions

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Merge the pxe_set_netdev()+pxe_[un]hook_int1a() pattern into a single
pxe_[de]activate() call.
This commit is contained in:
Michael Brown
2009-06-28 20:08:58 +01:00
parent c2965b0fe7
commit 07b5be3341
4 changed files with 61 additions and 40 deletions
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66
src/arch/i386/interface/pxe/pxe_call.c
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@@ -37,6 +37,9 @@ extern struct segoff __text16 ( pxe_int_1a_vector );
/** INT 1A handler */
extern void pxe_int_1a ( void );
/** INT 1A hooked flag */
static int int_1a_hooked = 0;
/** A function pointer to hold any PXE API call
*
* Used by pxe_api_call() to avoid large swathes of duplicated code.
@@ -364,25 +367,6 @@ __asmcall void pxe_loader_call ( struct i386_all_regs *ix86 ) {
ix86->regs.ax = ret;
}
/**
* Hook INT 1A for PXE
*
*/
void pxe_hook_int1a ( void ) {
hook_bios_interrupt ( 0x1a, ( unsigned int ) pxe_int_1a,
&pxe_int_1a_vector );
}
/**
* Unhook INT 1A for PXE
*
* @ret rc Return status code
*/
int pxe_unhook_int1a ( void ) {
return unhook_bios_interrupt ( 0x1a, ( unsigned int ) pxe_int_1a,
&pxe_int_1a_vector );
}
/**
* Calculate byte checksum as used by PXE
*
@@ -435,6 +419,50 @@ struct init_fn pxe_init_fn __init_fn ( INIT_NORMAL ) = {
.initialise = pxe_init_structures,
};
/**
* Activate PXE stack
*
* @v netdev Net device to use as PXE net device
*/
void pxe_activate ( struct net_device *netdev ) {
/* Ensure INT 1A is hooked */
if ( ! int_1a_hooked ) {
hook_bios_interrupt ( 0x1a, ( unsigned int ) pxe_int_1a,
&pxe_int_1a_vector );
int_1a_hooked = 1;
}
/* Set PXE network device */
pxe_set_netdev ( netdev );
}
/**
* Deactivate PXE stack
*
* @ret rc Return status code
*/
int pxe_deactivate ( void ) {
int rc;
/* Clear PXE network device */
pxe_set_netdev ( NULL );
/* Ensure INT 1A is unhooked, if possible */
if ( int_1a_hooked ) {
if ( ( rc = unhook_bios_interrupt ( 0x1a,
(unsigned int) pxe_int_1a,
&pxe_int_1a_vector ))!= 0){
DBG ( "Could not unhook INT 1A: %s\n",
strerror ( rc ) );
return rc;
}
int_1a_hooked = 0;
}
return 0;
}
/**
* Start PXE NBP at 0000:7c00
*