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Add 32-bit support.

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Generate DHCP data block for images.
This commit is contained in:
Michael Brown 2007-03-22 16:18:46 +00:00
parent ff7d0af585
commit 0d9b3e2dd2
1 changed files with 70 additions and 13 deletions
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83
src/arch/i386/image/nbi.c
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@ -3,9 +3,12 @@
#include <realmode.h>
#include <gateA20.h>
#include <memsizes.h>
#include <dhcp_basemem.h>
#include <gpxe/uaccess.h>
#include <gpxe/segment.h>
#include <gpxe/shutdown.h>
#include <gpxe/netdevice.h>
#include <gpxe/dhcp.h>
#include <gpxe/image.h>
/** @file
@ -302,7 +305,6 @@ static int nbi_boot16 ( struct image *image, struct imgheader *imgheader ) {
gateA20_unset();
#warning "Should be providing bootp data"
__asm__ __volatile__ (
REAL_CODE ( "pushw %%ds\n\t" /* far pointer to bootp data */
"pushw %%bx\n\t"
@ -318,7 +320,8 @@ static int nbi_boot16 ( struct image *image, struct imgheader *imgheader ) {
: "=a" ( rc ), "=D" ( discard_D ), "=S" ( discard_S ),
"=b" ( discard_b )
: "D" ( imgheader->execaddr.segoff ),
"S" ( imgheader->location ), "b" ( 0 /* bootp data */ )
"S" ( imgheader->location ),
"b" ( __from_data16 ( dhcp_basemem ) )
: "ecx", "edx", "ebp" );
gateA20_set();
@ -333,6 +336,7 @@ static int nbi_boot16 ( struct image *image, struct imgheader *imgheader ) {
* @ret rc Return status code, if image returns
*/
static int nbi_boot32 ( struct image *image, struct imgheader *imgheader ) {
int discard_D, discard_S, discard_b;
int rc;
DBGC ( image, "NBI %p executing 32-bit image at %lx\n",
@ -340,26 +344,73 @@ static int nbi_boot32 ( struct image *image, struct imgheader *imgheader ) {
/* no gateA20_unset for PM call */
#warning "Should be providing bootp data"
/* Jump to OS with flat physical addressing */
__asm__ __volatile__ (
PHYS_CODE ( "pushl $0\n\t" /* bootp data */
"pushl %3\n\t" /* imgheader */
"pushl %2\n\t" /* loaderinfo */
"xchgw %%bx,%%bx\n\t"
"call *%1\n\t"
PHYS_CODE ( "pushl %%ebx\n\t" /* bootp data */
"pushl %%esi\n\t" /* imgheader */
"pushl %%eax\n\t" /* loaderinfo */
"call *%%edi\n\t"
"addl $12, %%esp\n\t" /* clean up stack */ )
: "=a" ( rc )
: "=a" ( rc ), "=D" ( discard_D ), "=S" ( discard_S ),
"=b" ( discard_b )
: "D" ( imgheader->execaddr.linear ),
"a" ( virt_to_phys ( &loaderinfo ) ),
"S" ( ( imgheader->location.segment << 4 ) +
imgheader->location.offset )
: "ebx", "ecx", "edx", "ebp", "memory" );
imgheader->location.offset ),
"b" ( virt_to_phys ( dhcp_basemem ) ),
"a" ( virt_to_phys ( &loaderinfo ) )
: "ecx", "edx", "ebp", "memory" );
return rc;
}
/**
* Guess boot network device
*
* @ret netdev Boot network device
*/
static struct net_device * guess_boot_netdev ( void ) {
struct net_device *boot_netdev;
/* Just use the first network device */
for_each_netdev ( boot_netdev ) {
return boot_netdev;
}
return NULL;
}
/**
* Prepare DHCP parameter block for NBI image
*
* @v image NBI image
* @ret rc Return status code
*/
static int nbi_prepare_dhcp ( struct image *image ) {
struct dhcp_packet dhcppkt;
struct net_device *boot_netdev;
int rc;
boot_netdev = guess_boot_netdev();
if ( ! boot_netdev ) {
DBGC ( image, "NBI %p could not identify a network device\n",
image );
return -ENODEV;
}
if ( ( rc = create_dhcp_packet ( boot_netdev, DHCPACK,
dhcp_basemem, sizeof ( dhcp_basemem ),
&dhcppkt ) ) != 0 ) {
DBGC ( image, "NBI %p failed to build DHCP packet\n", image );
return rc;
}
if ( ( rc = copy_dhcp_packet_options ( &dhcppkt, NULL ) ) != 0 ) {
DBGC ( image, "NBI %p failed to copy DHCP options\n", image );
return rc;
}
return 0;
}
/**
* Execute a loaded NBI image
*
@ -374,10 +425,16 @@ static int nbi_exec ( struct image *image ) {
copy_from_user ( &imgheader, image->priv.user, 0,
sizeof ( imgheader ) );
/* Prepare DHCP option block */
if ( ( rc = nbi_prepare_dhcp ( image ) ) != 0 )
return rc;
/* Shut down now if NBI image will not return */
may_return = NBI_PROGRAM_RETURNS ( imgheader.flags );
if ( ! may_return )
shutdown();
/* Execute NBI image */
if ( NBI_LINEAR_EXEC_ADDR ( imgheader.flags ) ) {
rc = nbi_boot32 ( image, &imgheader );
} else {