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Separate out pxe_start_nbp() from pxe_image.c into pxe_call.c

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Implement PXENV_RESTART_TFTP.
This commit is contained in:
Michael Brown 2007-06-30 14:56:35 +01:00
parent acd598b4f9
commit 8130443f9f
5 changed files with 46 additions and 65 deletions
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23
src/arch/i386/image/pxe_image.c
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@ -30,12 +30,6 @@
#include <gpxe/segment.h>
#include <gpxe/netdevice.h>
/** PXE load address segment */
#define PXE_LOAD_SEGMENT 0
/** PXE load address offset */
#define PXE_LOAD_OFFSET 0x7c00
struct image_type pxe_image_type __image_type ( PROBE_PXE );
/**
@ -46,8 +40,6 @@ struct image_type pxe_image_type __image_type ( PROBE_PXE );
*/
static int pxe_exec ( struct image *image __unused ) {
struct net_device *netdev;
int discard_b, discard_c;
uint16_t rc;
/* Ensure that PXE stack is ready to use */
pxe_init_structures();
@ -59,20 +51,7 @@ static int pxe_exec ( struct image *image __unused ) {
break;
}
/* Far call to PXE NBP */
__asm__ __volatile__ ( REAL_CODE ( "pushw %%cx\n\t"
"pushw %%ax\n\t"
"movw %%cx, %%es\n\t"
"lcall $0, $0x7c00\n\t"
"addw $4, %%sp\n\t" )
: "=a" ( rc ), "=b" ( discard_b ),
"=c" ( discard_c )
: "a" ( & __from_text16 ( ppxe ) ),
"b" ( & __from_text16 ( pxenv ) ),
"c" ( rm_cs )
: "edx", "esi", "edi", "ebp", "memory" );
return rc;
return pxe_start_nbp();
}
/**

10
src/arch/i386/include/pxe_call.h
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@ -9,6 +9,15 @@
#include <pxe_api.h>
#include <realmode.h>
/** PXE load address segment */
#define PXE_LOAD_SEGMENT 0
/** PXE load address offset */
#define PXE_LOAD_OFFSET 0x7c00
/** PXE physical load address */
#define PXE_LOAD_PHYS ( ( PXE_LOAD_SEGMENT << 4 ) + PXE_LOAD_OFFSET )
/** !PXE structure */
extern struct s_PXE __text16 ( ppxe );
#define ppxe __use_text16 ( ppxe )
@ -20,5 +29,6 @@ extern struct s_PXENV __text16 ( pxenv );
extern void pxe_hook_int1a ( void );
extern int pxe_unhook_int1a ( void );
extern void pxe_init_structures ( void );
extern int pxe_start_nbp ( void );
#endif /* _PXE_CALL_H */

32
src/arch/i386/include/pxe_callbacks.h
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@ -1,32 +0,0 @@
/* Header for pxe_callbacks.c.
*/
#ifndef PXE_CALLBACKS_H
#define PXE_CALLBACKS_H
#include "etherboot.h"
#include "pxe_types.h"
typedef struct {
SEGOFF16_t orig_retaddr;
UINT16_t opcode;
SEGOFF16_t segoff;
} PACKED pxe_call_params_t;
/*
* These values are hard-coded into the PXE spec
*/
#define PXE_LOAD_SEGMENT (0x0000)
#define PXE_LOAD_OFFSET (0x7c00)
#define PXE_LOAD_ADDRESS ( ( PXE_LOAD_SEGMENT << 4 ) + PXE_LOAD_OFFSET )
/* Function prototypes
*/
extern struct pxe_stack * install_pxe_stack ( void *base );
extern void use_undi_ds_for_rm_stack ( uint16_t ds );
extern int hook_pxe_stack ( void );
extern int unhook_pxe_stack ( void );
extern void remove_pxe_stack ( void );
extern int xstartpxe ( void );
#endif /* PXE_CALLBACKS_H */

25
src/arch/i386/interface/pxe/pxe_call.c
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@ -363,3 +363,28 @@ void pxe_init_structures ( void ) {
ppxe.StructCksum -= pxe_checksum ( &ppxe, sizeof ( ppxe ) );
pxenv.Checksum -= pxe_checksum ( &pxenv, sizeof ( pxenv ) );
}
/**
* Start PXE NBP at 0000:7c00
*
* @ret rc Return status code
*/
int pxe_start_nbp ( void ) {
int discard_b, discard_c;
uint16_t rc;
/* Far call to PXE NBP */
__asm__ __volatile__ ( REAL_CODE ( "pushw %%cx\n\t"
"pushw %%ax\n\t"
"movw %%cx, %%es\n\t"
"lcall $0, $0x7c00\n\t"
"addw $4, %%sp\n\t" )
: "=a" ( rc ), "=b" ( discard_b ),
"=c" ( discard_c )
: "a" ( & __from_text16 ( ppxe ) ),
"b" ( & __from_text16 ( pxenv ) ),
"c" ( rm_cs )
: "edx", "esi", "edi", "ebp", "memory" );
return rc;
}

21
src/interface/pxe/pxe_preboot.c
View File

@ -30,7 +30,7 @@
#include <gpxe/dhcp.h>
#include <dhcp_basemem.h>
#include "pxe.h"
#include "pxe_callbacks.h"
#include "pxe_call.h"
/**
* UNLOAD BASE CODE STACK
@ -146,22 +146,21 @@ PXENV_EXIT_t pxenv_get_cached_info ( struct s_PXENV_GET_CACHED_INFO
*/
PXENV_EXIT_t pxenv_restart_tftp ( struct s_PXENV_TFTP_READ_FILE
*restart_tftp ) {
DBG ( "PXENV_RESTART_TFTP" );
PXENV_EXIT_t tftp_exit;
DBG ( "PXENV_RESTART_TFTP " );
#if 0
/* Words cannot describe the complete mismatch between the PXE
* specification and any possible version of reality...
*/
restart_tftp->Buffer = PXE_LOAD_ADDRESS; /* Fixed by spec, apparently */
restart_tftp->BufferSize = get_free_base_memory() - PXE_LOAD_ADDRESS; /* Near enough */
DBG ( "(" );
tftp_exit = pxe_api_call ( PXENV_TFTP_READ_FILE, (union u_PXENV_ANY*)restart_tftp );
DBG ( ")" );
if ( tftp_exit != PXENV_EXIT_SUCCESS ) return tftp_exit;
restart_tftp->Buffer = PXE_LOAD_PHYS; /* Fixed by spec, apparently */
restart_tftp->BufferSize = ( 0xa0000 - PXE_LOAD_PHYS ); /* Near enough */
tftp_exit = pxenv_tftp_read_file ( restart_tftp );
if ( tftp_exit != PXENV_EXIT_SUCCESS )
return tftp_exit;
/* Fire up the new NBP */
restart_tftp->Status = xstartpxe();
#endif
restart_tftp->Status = pxe_start_nbp();
/* Not sure what "SUCCESS" actually means, since we can only
* return if the new NBP failed to boot...