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Checking in obsolete but working memory-scanning code just for the record
This commit is contained in:
Michael Brown
parent
67e824b539
commit
075d79f6d4
@ -1,3 +1,5 @@
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#if 0
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/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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@ -22,7 +24,10 @@
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#include <assert.h>
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#include <pxe.h>
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#include <realmode.h>
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#include <bios.h>
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#include <pnpbios.h>
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#include <gpxe/device.h>
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#include <gpxe/pci.h>
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/** @file
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*
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@ -30,84 +35,6 @@
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*
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*/
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/**
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* UNDI parameter block
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*
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* Used as the paramter block for all UNDI API calls. Resides in base
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* memory.
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*/
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static union u_PXENV_ANY __data16 ( pxe_params );
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#define pxe_params __use_data16 ( pxe_params )
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/** UNDI entry point */
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static SEGOFF16_t __data16 ( pxe_entry_point );
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#define pxe_entry_point __use_data16 ( pxe_entry_point )
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/**
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* Issue PXE API call
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*
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* @v pxe PXE device
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* @v function API call number
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* @v params PXE parameter block
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* @v params_len Length of PXE parameter block
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* @ret rc Return status code
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*/
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int pxe_call ( struct pxe_device *pxe, unsigned int function,
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void *params, size_t params_len ) {
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union u_PXENV_ANY *pxenv_any = params;
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PXENV_EXIT_t exit;
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int discard_b, discard_D;
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int rc;
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/* Copy parameter block and entry point */
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assert ( params_len <= sizeof ( pxe_params ) );
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memcpy ( &pxe_params, params, params_len );
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pxe_entry_point = pxe->entry;
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/* Call real-mode entry point. This calling convention will
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* work with both the !PXE and the PXENV+ entry points.
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*/
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__asm__ __volatile__ ( REAL_CODE ( "pushw %%es\n\t"
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"pushw %%di\n\t"
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"pushw %%bx\n\t"
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"lcall *%c3\n\t"
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"addw $6, %%sp\n\t" )
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: "=a" ( exit ), "=b" ( discard_b ),
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"=D" ( discard_D )
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: "p" ( & __from_data16 ( pxe_entry_point ) ),
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"b" ( function ),
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"D" ( & __from_data16 ( pxe_params ) ) );
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/* UNDI API calls may rudely change the status of A20 and not
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* bother to restore it afterwards. Intel is known to be
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* guilty of this.
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*
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* Note that we will return to this point even if A20 gets
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* screwed up by the UNDI driver, because Etherboot always
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* resides in an even megabyte of RAM.
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*/
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gateA20_set();
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/* Copy parameter block back */
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memcpy ( params, &pxe_params, params_len );
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/* Determine return status code based on PXENV_EXIT and
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* PXENV_STATUS
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*/
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if ( exit == PXENV_EXIT_SUCCESS ) {
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rc = 0;
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} else {
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rc = -pxenv_any->Status;
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/* Paranoia; don't return success for the combination
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* of PXENV_EXIT_FAILURE but PXENV_STATUS_SUCCESS
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*/
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if ( rc == 0 )
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rc = -EIO;
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}
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return rc;
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}
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/**
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* Byte checksum
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*
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@ -125,82 +52,6 @@ static uint8_t checksum ( void *data, size_t len ) {
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return sum;
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}
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/**
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* Get PXE device information for an instantiated device
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*
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* @v pxe PXE device
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* @ret rc Return status code
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*/
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static int pxedev_get_instance_info ( struct pxe_device *pxe ) {
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struct s_PXENV pxenv;
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struct s_PXE ppxe;
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struct s_PXENV_UNDI_GET_INFORMATION undi_info;
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int rc;
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/* Determine entry point from PXENV+ structure */
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DBGC ( pxe, "PXE %p has PXENV+ structure at %04x:%04x\n", pxe,
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pxe->pxenv.segment, pxe->pxenv.offset );
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copy_from_real ( &pxenv, pxe->pxenv.segment, pxe->pxenv.offset,
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sizeof ( pxenv ) );
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if ( checksum ( &pxenv, sizeof ( pxenv ) ) != 0 ) {
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DBGC ( pxe, "PXE %p bad PXENV+ checksum\n", pxe );
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return -EINVAL;
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}
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pxe->entry = pxenv.RMEntry;
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/* If API version is 2.1 or greater, use the !PXE structure instead */
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if ( pxenv.Version >= 0x0201 ) {
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pxe->ppxe = pxenv.PXEPtr;
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DBGC ( pxe, "PXE %p has !PXE structure at %04x:%04x\n", pxe,
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pxe->ppxe.segment, pxe->ppxe.offset );
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copy_from_real ( &ppxe, pxe->ppxe.segment, pxe->ppxe.offset,
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sizeof ( ppxe ) );
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if ( checksum ( &pxenv, sizeof ( pxenv ) ) != 0 ) {
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DBGC ( pxe, "PXE %p bad !PXE checksum\n", pxe );
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return -EINVAL;
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}
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pxe->entry = ppxe.EntryPointSP;
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}
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DBGC ( pxe, "PXE %p using entry point at %04x:%04x\n", pxe,
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pxe->entry.segment, pxe->entry.offset );
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/* Get device information */
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memset ( &undi_info, 0, sizeof ( undi_info ) );
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if ( ( rc = pxe_call ( pxe, PXENV_UNDI_GET_INFORMATION, &undi_info,
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sizeof ( undi_info ) ) ) != 0 ) {
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DBGC ( pxe, "PXE %p could not retrieve UNDI information: %s\n",
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pxe, strerror ( rc ) );
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return rc;
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}
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memcpy ( pxe->hwaddr, undi_info.PermNodeAddress,
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sizeof ( pxe->hwaddr ) );
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pxe->irq = undi_info.IntNumber;
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pxe->rom_segment = undi_info.ROMAddress;
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return 0;
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}
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/**
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* Register PXE device
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*
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* @v pxe PXE device
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* @ret rc Return status code
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*/
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static int register_pxedev ( struct pxe_device *pxe ) {
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int rc;
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DBGC ( pxe, "PXE %p registering\n", pxe );
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/* Register as an UNDI driver */
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if ( ( rc = undi_probe ( pxe ) ) != 0 )
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return rc;
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/* Add to device hierarchy and return */
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list_add ( &pxe->dev.siblings, &pxe->dev.parent->children );
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return 0;
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}
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/**
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* Unregister a PXE device
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*
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@ -224,47 +75,74 @@ static void pxebus_remove ( struct root_device *rootdev );
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* find.
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*/
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static int pxebus_probe ( struct root_device *rootdev ) {
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struct pxe_device *pxe;
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uint16_t signature;
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uint16_t pxenv_segment;
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uint16_t pxenv_offset;
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struct pxe_device *pxe = NULL;
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struct s_PXENV pxenv;
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struct s_PXE ppxe;
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uint16_t fbms;
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unsigned int segment;
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unsigned int undi_cs;
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int rc;
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/* PXE installation check */
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__asm__ __volatile__ ( REAL_CODE ( "stc\n\t"
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"int $0x1a\n\t"
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"jnc 1f\n\t"
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"xorw %%ax, %%ax\n\t"
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"\n1:\n\t"
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"movw %%es, %%dx\n\t" )
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: "=a" ( signature ), "=b" ( pxenv_offset ),
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"=d" ( pxenv_segment )
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: "a" ( 0x5650 ) );
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if ( signature != 0x564e ) {
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DBG ( "No pixies found\n" );
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return 0;
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/* Scan through allocated base memory for PXENV+ structure */
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get_real ( fbms, BDA_SEG, BDA_FBMS );
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for ( segment = ( fbms << 6 ) ; segment < 0xa000 ; segment++ ) {
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/* Verify PXENV+ signature and checksum */
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copy_from_real ( &pxenv, segment, 0, sizeof ( pxenv ) );
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if ( memcmp ( pxenv.Signature, "PXENV+", 6 ) != 0 )
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continue;
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DBG ( "Found PXENV+ signature at %04x0\n", segment );
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if ( checksum ( &pxenv, sizeof ( pxenv ) ) != 0 ) {
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DBG ( "...bad checksum\n" );
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continue;
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}
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/* Allocate PXE device structure */
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pxe = malloc ( sizeof ( *pxe ) );
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if ( ! pxe ) {
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rc = -ENOMEM;
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goto err;
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}
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memset ( pxe, 0, sizeof ( *pxe ) );
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/* Add to device hierarchy */
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pxe->dev.parent = &rootdev->dev;
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INIT_LIST_HEAD ( &pxe->dev.children );
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list_add ( &pxe->dev.siblings, &rootdev->dev.children );
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/* Populate PXE device structure */
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undi_cs = pxenv.UNDICodeSeg;
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pxe->pxenv.segment = undi_cs;
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pxe->pxenv.offset = ( ( segment - undi_cs ) << 4 );
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DBGC ( pxe, "PXE %p has PXENV+ structure at %04x:%04x\n",
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pxe, pxe->pxenv.segment, pxe->pxenv.offset );
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pxe->entry = pxenv.RMEntry;
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if ( pxenv.Version >= 0x0201 ) {
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pxe->ppxe = pxenv.PXEPtr;
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copy_from_real ( &ppxe, pxe->ppxe.segment,
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pxe->ppxe.offset, sizeof ( ppxe ) );
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if ( ( memcmp ( ppxe.Signature, "!PXE", 4 ) == 0 ) &&
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( checksum ( &ppxe, sizeof ( ppxe ) ) == 0 ) ) {
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DBGC ( pxe, "PXE %p has !PXE structure at "
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"%04x:%04x\n", pxe,
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pxe->ppxe.segment, pxe->ppxe.offset );
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pxe->entry = ppxe.EntryPointSP;
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}
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}
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DBGC ( pxe, "PXE %p using entry point at %04x:%04x\n", pxe,
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pxe->entry.segment, pxe->entry.offset );
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/* Register PXE device */
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if ( undi_probe ( pxe ) == 0 ) {
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/* Device registered; drop reference */
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pxe = NULL;
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} else {
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/* Not registered; re-use struct pxe_device */
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list_del ( &pxe->dev.siblings );
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}
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}
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/* Allocate PXE device structure */
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pxe = malloc ( sizeof ( *pxe ) );
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if ( ! pxe ) {
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rc = -ENOMEM;
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goto err;
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}
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memset ( pxe, 0, sizeof ( *pxe ) );
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/* Populate PXE device structure */
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pxe->pxenv.segment = pxenv_segment;
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pxe->pxenv.offset = pxenv_offset;
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INIT_LIST_HEAD ( &pxe->dev.children );
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pxe->dev.parent = &rootdev->dev;
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if ( ( rc = pxedev_get_instance_info ( pxe ) ) != 0 )
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goto err;
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/* Register PXE device */
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if ( ( rc = register_pxedev ( pxe ) ) != 0 )
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goto err;
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free ( pxe );
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return 0;
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err:
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@ -299,7 +177,6 @@ static struct root_driver pxe_root_driver = {
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struct root_device pxe_root_device __root_device = {
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.name = "PXE",
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.driver = &pxe_root_driver,
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.dev = {
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.children = LIST_HEAD_INIT ( pxe_root_device.dev.children ),
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},
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};
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#endif
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