undiload.c File Reference

UNDI load/unload. More...

#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <pxe.h>
#include <realmode.h>
#include <bios.h>
#include <pnpbios.h>
#include <basemem.h>
#include <gpxe/pci.h>
#include <undi.h>
#include <undirom.h>
#include <undiload.h>

Go to the source code of this file.

Defines
#define	undi_loader   __use_data16 ( undi_loader )
#define	undi_loader_entry   __use_data16 ( undi_loader_entry )
Functions
	FILE_LICENCE (GPL2_OR_LATER)
static struct s_UNDI_LOADER	__bss16 (undi_loader)
	Parameter block for calling UNDI loader.
static SEGOFF16_t	__bss16 (undi_loader_entry)
	UNDI loader entry point.
int	undi_load (struct undi_device *undi, struct undi_rom *undirom)
	Call UNDI loader to create a pixie.
int	undi_unload (struct undi_device *undi)
	Unload a pixie.

---

Detailed Description

UNDI load/unload.

Definition in file undiload.c.

---

Define Documentation

#define undi_loader   __use_data16 ( undi_loader )

Definition at line 42 of file undiload.c.

Referenced by pxe_loader_call(), and undi_load().

#define undi_loader_entry   __use_data16 ( undi_loader_entry )

Definition at line 46 of file undiload.c.

Referenced by undi_load(), and undi_unload().

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

static struct s_UNDI_LOADER __bss16

(

undi_loader

)

[static, read]

Parameter block for calling UNDI loader.

static SEGOFF16_t __bss16

(

undi_loader_entry

)

[static]

UNDI loader entry point.

int undi_load	(	struct undi_device *	undi,
		struct undi_rom *	undirom
	)

Call UNDI loader to create a pixie.

Parameters:

	undi	UNDI device
	undirom	UNDI ROM

Return values:

rc

Return status code

Definition at line 55 of file undiload.c.

References __asm__(), __from_data16, BIOS_SEG, undi_rom::code_size, copy_from_real, undi_rom::data_size, DBG, DBGC, EBUSY, EIO, undi_device::entry, s_PXE::EntryPointSP, undi_device::fbms, find_pnp_bios(), gateA20_set(), get_fbms(), undi_device::isapnp_csn, undi_device::isapnp_read_port, undi_rom::loader_entry, memset(), s_SEGOFF16::offset, undi_device::pci_busdevfn, PCI_FUNC, PCI_SLOT, undi_device::ppxe, undi_device::pxenv, PXENV_EXIT_SUCCESS, REAL_CODE, undi_device::restore_fbms, s_SEGOFF16::segment, set_fbms(), strerror(), undi_loader, undi_loader_entry, UNDI_NO_ISAPNP_CSN, and UNDI_NO_PCI_BUSDEVFN.

Referenced by undi_load_pci().

                                                                     {
        struct s_PXE ppxe;
        unsigned int fbms_seg;
        uint16_t exit;
        int rc;

        /* Only one UNDI instance may be loaded at any given time */
        if ( undi_loader_entry.segment ) {
                DBG ( "UNDI %p cannot load multiple instances\n", undi );
                return -EBUSY;
        }

        /* Set up START_UNDI parameters */
        memset ( &undi_loader, 0, sizeof ( undi_loader ) );
        undi_loader.AX = undi->pci_busdevfn;
        undi_loader.BX = undi->isapnp_csn;
        undi_loader.DX = undi->isapnp_read_port;
        undi_loader.ES = BIOS_SEG;
        undi_loader.DI = find_pnp_bios();

        /* Allocate base memory for PXE stack */
        undi->restore_fbms = get_fbms();
        fbms_seg = ( undi->restore_fbms << 6 );
        fbms_seg -= ( ( undirom->code_size + 0x0f ) >> 4 );
        undi_loader.UNDI_CS = fbms_seg;
        fbms_seg -= ( ( undirom->data_size + 0x0f ) >> 4 );
        undi_loader.UNDI_DS = fbms_seg;

        /* Debug info */
        DBGC ( undi, "UNDI %p loading UNDI ROM %p to CS %04x DS %04x for ",
               undi, undirom, undi_loader.UNDI_CS, undi_loader.UNDI_DS );
        if ( undi->pci_busdevfn != UNDI_NO_PCI_BUSDEVFN ) {
                unsigned int bus = ( undi->pci_busdevfn >> 8 );
                unsigned int devfn = ( undi->pci_busdevfn & 0xff );
                DBGC ( undi, "PCI %02x:%02x.%x\n",
                       bus, PCI_SLOT ( devfn ), PCI_FUNC ( devfn ) );
        }
        if ( undi->isapnp_csn != UNDI_NO_ISAPNP_CSN ) {
                DBGC ( undi, "ISAPnP(%04x) CSN %04x\n",
                       undi->isapnp_read_port, undi->isapnp_csn );
        }

        /* Call loader */
        undi_loader_entry = undirom->loader_entry;
        __asm__ __volatile__ ( REAL_CODE ( "pushw %%ds\n\t"
                                           "pushw %%ax\n\t"
                                           "lcall *undi_loader_entry\n\t"
                                           "addw $4, %%sp\n\t" )
                               : "=a" ( exit )
                               : "a" ( __from_data16 ( &undi_loader ) )
                               : "ebx", "ecx", "edx", "esi", "edi", "ebp" );

        /* UNDI API calls may rudely change the status of A20 and not
         * bother to restore it afterwards.  Intel is known to be
         * guilty of this.
         *
         * Note that we will return to this point even if A20 gets
         * screwed up by the UNDI driver, because Etherboot always
         * resides in an even megabyte of RAM.
         */     
        gateA20_set();

        if ( exit != PXENV_EXIT_SUCCESS ) {
                /* Clear entry point */
                memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) );

                rc = -undi_loader.Status;
                if ( rc == 0 ) /* Paranoia */
                        rc = -EIO;
                DBGC ( undi, "UNDI %p loader failed: %s\n",
                       undi, strerror ( rc ) );
                return rc;
        }

        /* Populate PXE device structure */
        undi->pxenv = undi_loader.PXENVptr;
        undi->ppxe = undi_loader.PXEptr;
        copy_from_real ( &ppxe, undi->ppxe.segment, undi->ppxe.offset,
                         sizeof ( ppxe ) );
        undi->entry = ppxe.EntryPointSP;
        DBGC ( undi, "UNDI %p loaded PXENV+ %04x:%04x !PXE %04x:%04x "
               "entry %04x:%04x\n", undi, undi->pxenv.segment,
               undi->pxenv.offset, undi->ppxe.segment, undi->ppxe.offset,
               undi->entry.segment, undi->entry.offset );

        /* Update free base memory counter */
        undi->fbms = ( fbms_seg >> 6 );
        set_fbms ( undi->fbms );
        DBGC ( undi, "UNDI %p using [%d,%d) kB of base memory\n",
               undi, undi->fbms, undi->restore_fbms );

        return 0;
}

int undi_unload

(

struct undi_device *

undi

)

Unload a pixie.

Parameters:

undi

UNDI device

Return values:

rc

Return status code

Erases the PXENV+ and !PXE signatures, and frees the used base memory (if possible).

Definition at line 158 of file undiload.c.

References DBGC, EBUSY, undi_device::fbms, get_fbms(), memset(), s_SEGOFF16::offset, undi_device::ppxe, put_real, undi_device::pxenv, undi_device::restore_fbms, s_SEGOFF16::segment, set_fbms(), and undi_loader_entry.

Referenced by undipci_probe(), and undipci_remove().

                                             {
        static uint32_t dead = 0xdeaddead;

        DBGC ( undi, "UNDI %p unloading\n", undi );

        /* Clear entry point */
        memset ( &undi_loader_entry, 0, sizeof ( undi_loader_entry ) );

        /* Erase signatures */
        if ( undi->pxenv.segment )
                put_real ( dead, undi->pxenv.segment, undi->pxenv.offset );
        if ( undi->ppxe.segment )
                put_real ( dead, undi->ppxe.segment, undi->ppxe.offset );

        /* Free base memory, if possible */
        if ( undi->fbms == get_fbms() ) {
                DBGC ( undi, "UNDI %p freeing [%d,%d) kB of base memory\n",
                       undi, undi->fbms, undi->restore_fbms );
                set_fbms ( undi->restore_fbms );
                return 0;
        } else {
                DBGC ( undi, "UNDI %p leaking [%d,%d) kB of base memory\n",
                       undi, undi->fbms, undi->restore_fbms );
                return -EBUSY;
        }
}