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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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15
src/arch/i386/image/pxe_image.c
View File

@ -44,27 +44,24 @@ struct image_type pxe_image_type __image_type ( PROBE_PXE );
* @ret rc Return status code
*/
static int pxe_exec ( struct image *image ) {
struct net_device *netdev;
int rc;
/* Ensure that PXE stack is ready to use */
pxe_hook_int1a();
/* Arbitrarily pick the most recently opened network device */
pxe_set_netdev ( last_opened_netdev() );
/* Many things will break if pxe_netdev is NULL */
if ( ! pxe_netdev ) {
if ( ( netdev = last_opened_netdev() ) == NULL ) {
DBGC ( image, "IMAGE %p could not locate PXE net device\n",
image );
return -ENODEV;
}
/* Activate PXE */
pxe_activate ( netdev );
/* Start PXE NBP */
rc = pxe_start_nbp();
/* Deactivate PXE */
pxe_set_netdev ( NULL );
pxe_unhook_int1a();
pxe_deactivate();
return rc;
}

6
src/arch/i386/include/pxe_call.h
View File

@ -11,6 +11,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <pxe_api.h>
#include <realmode.h>
struct net_device;
/** PXE load address segment */
#define PXE_LOAD_SEGMENT 0
@ -28,8 +30,8 @@ extern struct s_PXE __text16 ( ppxe );
extern struct s_PXENV __text16 ( pxenv );
#define pxenv __use_text16 ( pxenv )
extern void pxe_hook_int1a ( void );
extern int pxe_unhook_int1a ( void );
extern void pxe_activate ( struct net_device *netdev );
extern int pxe_deactivate ( void );
extern int pxe_start_nbp ( void );
extern __asmcall void pxe_api_call ( struct i386_all_regs *ix86 );

66
src/arch/i386/interface/pxe/pxe_call.c
View File

@ -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
*

14
src/arch/i386/interface/pxe/pxe_preboot.c
View File

@ -296,11 +296,8 @@ PXENV_EXIT_t pxenv_start_undi ( struct s_PXENV_START_UNDI *start_undi ) {
}
DBG ( " using netdev %s", netdev->name );
/* Save as PXE net device */
pxe_set_netdev ( netdev );
/* Hook INT 1A */
pxe_hook_int1a();
/* Activate PXE */
pxe_activate ( netdev );
start_undi->Status = PXENV_STATUS_SUCCESS;
return PXENV_EXIT_SUCCESS;
@ -313,11 +310,8 @@ PXENV_EXIT_t pxenv_start_undi ( struct s_PXENV_START_UNDI *start_undi ) {
PXENV_EXIT_t pxenv_stop_undi ( struct s_PXENV_STOP_UNDI *stop_undi ) {
DBG ( "PXENV_STOP_UNDI" );
/* Unhook INT 1A */
pxe_unhook_int1a();
/* Clear PXE net device */
pxe_set_netdev ( NULL );
/* Deactivate PXE */
pxe_deactivate();
/* Prepare for unload */
shutdown ( SHUTDOWN_BOOT );