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Partial implementation of UNDI loader caller.

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This commit is contained in:
Michael Brown
2007-01-05 03:24:39 +00:00
parent 0638945c7e
commit 9780fef360
4 changed files with 107 additions and 55 deletions
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93
src/arch/i386/drivers/bus/pxedrv.c
View File

@@ -21,6 +21,7 @@
#include <string.h>
#include <pxe.h>
#include <realmode.h>
#include <bios.h>
/** @file
*
@@ -62,14 +63,15 @@ static int pxedrv_parse_pxeromid ( struct pxe_driver *pxedrv,
}
/* Fill in PXE driver loader fields */
pxedrv->loader.segment = pxedrv->rom_segment;
pxedrv->loader.offset = undiloader;
pxedrv->loader_entry.segment = pxedrv->rom_segment;
pxedrv->loader_entry.offset = undiloader;
pxedrv->code_size = undi_rom_id.CodeSize;
pxedrv->data_size = undi_rom_id.DataSize;
DBGC ( pxedrv, "PXEDRV %p has UNDI loader at %04x:%04x "
"(code %04x data %04x)\n", pxedrv, pxedrv->loader.segment,
pxedrv->loader.offset, pxedrv->code_size, pxedrv->data_size );
"(code %04x data %04x)\n", pxedrv,
pxedrv->loader_entry.segment, pxedrv->loader_entry.offset,
pxedrv->code_size, pxedrv->data_size );
return 0;
}
@@ -221,3 +223,86 @@ struct pxe_driver * pxedrv_find_pci_driver ( unsigned int vendor_id,
vendor_id, device_id, rombase );
return NULL;
}
/** Parameter block for calling UNDI loader */
static struct s_UNDI_LOADER __data16 ( undi_loader );
#define undi_loader __use_data16 ( undi_loader )
/** UNDI loader entry point */
static SEGOFF16_t __data16 ( undi_loader_entry );
#define undi_loader_entry __use_data16 ( undi_loader_entry )
/**
* Call UNDI loader to create a pixie
*
* @v pxedrv PXE driver
* @v pxe PXE device to be created
* @v pci_busdevfn PCI bus:dev.fn (PCI devices only), or 0
* @v isapnp_csn ISAPnP Card Select Number, or -1U
* @v isapnp_read_port ISAPnP read port, or -1U
* @ret rc Return status code
*/
static int pxedrv_load ( struct pxe_driver *pxedrv, struct pxe_device *pxe,
unsigned int pci_busdevfn, unsigned int isapnp_csn,
unsigned int isapnp_read_port ) {
int discard;
uint16_t exit;
uint16_t fbms;
unsigned int fbms_seg;
int rc;
memset ( &undi_loader, 0, sizeof ( undi_loader ) );
undi_loader.AX = pci_busdevfn;
undi_loader.BX = isapnp_csn;
undi_loader.DX = isapnp_read_port;
/* Allocate base memory for PXE stack */
get_real ( fbms, BDA_SEG, BDA_FBMS );
fbms_seg = ( fbms << 6 );
fbms_seg -= ( ( pxedrv->data_size + 0x0f ) >> 4 );
undi_loader.UNDI_DS = fbms_seg;
fbms_seg -= ( ( pxedrv->code_size + 0x0f ) >> 4 );
undi_loader.UNDI_CS = fbms_seg;
DBGC ( pxedrv, "PXEDRV %p loading to CS %04x and DS %04x\n", pxedrv,
undi_loader.UNDI_CS, undi_loader.UNDI_DS );
/* Call loader */
undi_loader_entry = pxedrv->loader_entry;
__asm__ __volatile__ ( REAL_CODE ( "pushw %%ds\n\t"
"pushw %w0\n\t"
"lcall *%c3\n\t"
"addw $4, %%sp\n\t" )
: "=a" ( exit ), "=r" ( discard )
: "0" ( & __from_data16 ( undi_loader ) ),
"p" ( & __from_data16 ( undi_loader_entry )));
if ( exit != PXENV_EXIT_SUCCESS ) {
rc = -undi_loader.Status;
if ( rc == 0 ) /* Paranoia */
rc = -EIO;
DBGC ( pxedrv, "PXEDRV %p loader failed: %s\n",
strerror ( rc ) );
return rc;
}
/* Update free base memory counter */
fbms = ( fbms_seg >> 6 );
put_real ( fbms, BDA_SEG, BDA_FBMS );
/* Record location of pixie in PXE device structure */
pxe->pxenv = undi_loader.PXENVptr;
pxe->ppxe = undi_loader.PXEptr;
return 0;
}
/**
* Call UNDI loader to create a pixie
*
* @v pxedrv PXE driver
* @v pxe PXE device to be created
* @v pci_busdevfn PCI bus:dev.fn
* @ret rc Return status code
*/
int pxedrv_load_pci ( struct pxe_driver *pxedrv, struct pxe_device *pxe,
unsigned int bus, unsigned int devfn ) {
return pxedrv_load ( pxedrv, pxe, ( ( bus << 8 ) | devfn ), -1U, -1U );
}

1
src/arch/i386/include/bios.h
View File

@@ -2,6 +2,7 @@
#define BIOS_H
#define BDA_SEG 0x0040
#define BDA_FBMS 0x0013
#define BDA_NUM_DRIVES 0x0075
extern unsigned long currticks ( void );