aboutsummaryrefslogtreecommitdiffstats
path: root/gpxe/src/arch/i386/interface/pxe
diff options
context:
space:
mode:
authorH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
committerH. Peter Anvin <hpa@zytor.com>2008-03-26 16:25:35 -0700
commit9eddd22a7b53b1d02fbae0d987df8af122924248 (patch)
tree882f5152880b0b1aa2d7a0619d30065acc69fb16 /gpxe/src/arch/i386/interface/pxe
parentbbb8f15936b851e6a0ef6f7bb2c95197bff35994 (diff)
downloadsyslinux.git-9eddd22a7b53b1d02fbae0d987df8af122924248.tar.gz
syslinux.git-9eddd22a7b53b1d02fbae0d987df8af122924248.tar.xz
syslinux.git-9eddd22a7b53b1d02fbae0d987df8af122924248.zip
Add gPXE into the source tree; build unified imagesyslinux-3.70-pre7
Diffstat (limited to 'gpxe/src/arch/i386/interface/pxe')
-rw-r--r--gpxe/src/arch/i386/interface/pxe/pxe_call.c450
-rw-r--r--gpxe/src/arch/i386/interface/pxe/pxe_entry.S195
2 files changed, 645 insertions, 0 deletions
diff --git a/gpxe/src/arch/i386/interface/pxe/pxe_call.c b/gpxe/src/arch/i386/interface/pxe/pxe_call.c
new file mode 100644
index 00000000..5b307d40
--- /dev/null
+++ b/gpxe/src/arch/i386/interface/pxe/pxe_call.c
@@ -0,0 +1,450 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <gpxe/uaccess.h>
+#include <registers.h>
+#include <biosint.h>
+#include <pxe.h>
+#include <pxe_call.h>
+
+/** @file
+ *
+ * PXE API entry point
+ */
+
+/** Vector for chaining INT 1A */
+extern struct segoff __text16 ( pxe_int_1a_vector );
+#define pxe_int_1a_vector __use_text16 ( pxe_int_1a_vector )
+
+/** INT 1A handler */
+extern void pxe_int_1a ( void );
+
+/** A function pointer to hold any PXE API call
+ *
+ * Used by pxe_api_call() to avoid large swathes of duplicated code.
+ */
+union pxenv_call {
+ PXENV_EXIT_t ( * any ) ( union u_PXENV_ANY * );
+ PXENV_EXIT_t ( * unknown ) ( struct s_PXENV_UNKNOWN * );
+ PXENV_EXIT_t ( * unload_stack ) ( struct s_PXENV_UNLOAD_STACK * );
+ PXENV_EXIT_t ( * get_cached_info )
+ ( struct s_PXENV_GET_CACHED_INFO * );
+ PXENV_EXIT_t ( * restart_tftp ) ( struct s_PXENV_TFTP_READ_FILE * );
+ PXENV_EXIT_t ( * start_undi ) ( struct s_PXENV_START_UNDI * );
+ PXENV_EXIT_t ( * stop_undi ) ( struct s_PXENV_STOP_UNDI * );
+ PXENV_EXIT_t ( * start_base ) ( struct s_PXENV_START_BASE * );
+ PXENV_EXIT_t ( * stop_base ) ( struct s_PXENV_STOP_BASE * );
+ PXENV_EXIT_t ( * tftp_open ) ( struct s_PXENV_TFTP_OPEN * );
+ PXENV_EXIT_t ( * tftp_close ) ( struct s_PXENV_TFTP_CLOSE * );
+ PXENV_EXIT_t ( * tftp_read ) ( struct s_PXENV_TFTP_READ * );
+ PXENV_EXIT_t ( * tftp_read_file ) ( struct s_PXENV_TFTP_READ_FILE * );
+ PXENV_EXIT_t ( * tftp_get_fsize ) ( struct s_PXENV_TFTP_GET_FSIZE * );
+ PXENV_EXIT_t ( * udp_open ) ( struct s_PXENV_UDP_OPEN * );
+ PXENV_EXIT_t ( * udp_close ) ( struct s_PXENV_UDP_CLOSE * );
+ PXENV_EXIT_t ( * udp_write ) ( struct s_PXENV_UDP_WRITE * );
+ PXENV_EXIT_t ( * udp_read ) ( struct s_PXENV_UDP_READ * );
+ PXENV_EXIT_t ( * undi_startup ) ( struct s_PXENV_UNDI_STARTUP * );
+ PXENV_EXIT_t ( * undi_cleanup ) ( struct s_PXENV_UNDI_CLEANUP * );
+ PXENV_EXIT_t ( * undi_initialize )
+ ( struct s_PXENV_UNDI_INITIALIZE * );
+ PXENV_EXIT_t ( * undi_reset_adapter ) ( struct s_PXENV_UNDI_RESET * );
+ PXENV_EXIT_t ( * undi_shutdown ) ( struct s_PXENV_UNDI_SHUTDOWN * );
+ PXENV_EXIT_t ( * undi_open ) ( struct s_PXENV_UNDI_OPEN * );
+ PXENV_EXIT_t ( * undi_close ) ( struct s_PXENV_UNDI_CLOSE * );
+ PXENV_EXIT_t ( * undi_transmit ) ( struct s_PXENV_UNDI_TRANSMIT * );
+ PXENV_EXIT_t ( * undi_set_mcast_address )
+ ( struct s_PXENV_UNDI_SET_MCAST_ADDRESS * );
+ PXENV_EXIT_t ( * undi_set_station_address )
+ ( struct s_PXENV_UNDI_SET_STATION_ADDRESS * );
+ PXENV_EXIT_t ( * undi_set_packet_filter )
+ ( struct s_PXENV_UNDI_SET_PACKET_FILTER * );
+ PXENV_EXIT_t ( * undi_get_information )
+ ( struct s_PXENV_UNDI_GET_INFORMATION * );
+ PXENV_EXIT_t ( * undi_get_statistics )
+ ( struct s_PXENV_UNDI_GET_STATISTICS * );
+ PXENV_EXIT_t ( * undi_clear_statistics )
+ ( struct s_PXENV_UNDI_CLEAR_STATISTICS * );
+ PXENV_EXIT_t ( * undi_initiate_diags )
+ ( struct s_PXENV_UNDI_INITIATE_DIAGS * );
+ PXENV_EXIT_t ( * undi_force_interrupt )
+ ( struct s_PXENV_UNDI_FORCE_INTERRUPT * );
+ PXENV_EXIT_t ( * undi_get_mcast_address )
+ ( struct s_PXENV_UNDI_GET_MCAST_ADDRESS * );
+ PXENV_EXIT_t ( * undi_get_nic_type )
+ ( struct s_PXENV_UNDI_GET_NIC_TYPE * );
+ PXENV_EXIT_t ( * undi_get_iface_info )
+ ( struct s_PXENV_UNDI_GET_IFACE_INFO * );
+ PXENV_EXIT_t ( * undi_get_state ) ( struct s_PXENV_UNDI_GET_STATE * );
+ PXENV_EXIT_t ( * undi_isr ) ( struct s_PXENV_UNDI_ISR * );
+ PXENV_EXIT_t ( * file_open ) ( struct s_PXENV_FILE_OPEN * );
+ PXENV_EXIT_t ( * file_close ) ( struct s_PXENV_FILE_CLOSE * );
+ PXENV_EXIT_t ( * file_select ) ( struct s_PXENV_FILE_SELECT * );
+ PXENV_EXIT_t ( * file_read ) ( struct s_PXENV_FILE_READ * );
+ PXENV_EXIT_t ( * get_file_size ) ( struct s_PXENV_GET_FILE_SIZE * );
+ PXENV_EXIT_t ( * file_exec ) ( struct s_PXENV_FILE_EXEC * );
+ PXENV_EXIT_t ( * file_api_check ) ( struct s_PXENV_FILE_API_CHECK * );
+};
+
+/**
+ * Handle an unknown PXE API call
+ *
+ * @v pxenv_unknown Pointer to a struct s_PXENV_UNKNOWN
+ * @ret #PXENV_EXIT_FAILURE Always
+ * @err #PXENV_STATUS_UNSUPPORTED Always
+ */
+static PXENV_EXIT_t pxenv_unknown ( struct s_PXENV_UNKNOWN *pxenv_unknown ) {
+ pxenv_unknown->Status = PXENV_STATUS_UNSUPPORTED;
+ return PXENV_EXIT_FAILURE;
+}
+
+/**
+ * Dispatch PXE API call
+ *
+ * @v bx PXE opcode
+ * @v es:di Address of PXE parameter block
+ * @ret ax PXE exit code
+ */
+__cdecl void pxe_api_call ( struct i386_all_regs *ix86 ) {
+ int opcode = ix86->regs.bx;
+ userptr_t parameters = real_to_user ( ix86->segs.es, ix86->regs.di );
+ size_t param_len;
+ union u_PXENV_ANY pxenv_any;
+ union pxenv_call pxenv_call;
+ PXENV_EXIT_t ret;
+
+ switch ( opcode ) {
+ case PXENV_UNLOAD_STACK:
+ pxenv_call.unload_stack = pxenv_unload_stack;
+ param_len = sizeof ( pxenv_any.unload_stack );
+ break;
+ case PXENV_GET_CACHED_INFO:
+ pxenv_call.get_cached_info = pxenv_get_cached_info;
+ param_len = sizeof ( pxenv_any.get_cached_info );
+ break;
+ case PXENV_RESTART_TFTP:
+ pxenv_call.restart_tftp = pxenv_restart_tftp;
+ param_len = sizeof ( pxenv_any.restart_tftp );
+ break;
+ case PXENV_START_UNDI:
+ pxenv_call.start_undi = pxenv_start_undi;
+ param_len = sizeof ( pxenv_any.start_undi );
+ break;
+ case PXENV_STOP_UNDI:
+ pxenv_call.stop_undi = pxenv_stop_undi;
+ param_len = sizeof ( pxenv_any.stop_undi );
+ break;
+ case PXENV_START_BASE:
+ pxenv_call.start_base = pxenv_start_base;
+ param_len = sizeof ( pxenv_any.start_base );
+ break;
+ case PXENV_STOP_BASE:
+ pxenv_call.stop_base = pxenv_stop_base;
+ param_len = sizeof ( pxenv_any.stop_base );
+ break;
+ case PXENV_TFTP_OPEN:
+ pxenv_call.tftp_open = pxenv_tftp_open;
+ param_len = sizeof ( pxenv_any.tftp_open );
+ break;
+ case PXENV_TFTP_CLOSE:
+ pxenv_call.tftp_close = pxenv_tftp_close;
+ param_len = sizeof ( pxenv_any.tftp_close );
+ break;
+ case PXENV_TFTP_READ:
+ pxenv_call.tftp_read = pxenv_tftp_read;
+ param_len = sizeof ( pxenv_any.tftp_read );
+ break;
+ case PXENV_TFTP_READ_FILE:
+ pxenv_call.tftp_read_file = pxenv_tftp_read_file;
+ param_len = sizeof ( pxenv_any.tftp_read_file );
+ break;
+ case PXENV_TFTP_GET_FSIZE:
+ pxenv_call.tftp_get_fsize = pxenv_tftp_get_fsize;
+ param_len = sizeof ( pxenv_any.tftp_get_fsize );
+ break;
+ case PXENV_UDP_OPEN:
+ pxenv_call.udp_open = pxenv_udp_open;
+ param_len = sizeof ( pxenv_any.udp_open );
+ break;
+ case PXENV_UDP_CLOSE:
+ pxenv_call.udp_close = pxenv_udp_close;
+ param_len = sizeof ( pxenv_any.udp_close );
+ break;
+ case PXENV_UDP_WRITE:
+ pxenv_call.udp_write = pxenv_udp_write;
+ param_len = sizeof ( pxenv_any.udp_write );
+ break;
+ case PXENV_UDP_READ:
+ pxenv_call.udp_read = pxenv_udp_read;
+ param_len = sizeof ( pxenv_any.udp_read );
+ break;
+ case PXENV_UNDI_STARTUP:
+ pxenv_call.undi_startup = pxenv_undi_startup;
+ param_len = sizeof ( pxenv_any.undi_startup );
+ break;
+ case PXENV_UNDI_CLEANUP:
+ pxenv_call.undi_cleanup = pxenv_undi_cleanup;
+ param_len = sizeof ( pxenv_any.undi_cleanup );
+ break;
+ case PXENV_UNDI_INITIALIZE:
+ pxenv_call.undi_initialize = pxenv_undi_initialize;
+ param_len = sizeof ( pxenv_any.undi_initialize );
+ break;
+ case PXENV_UNDI_RESET_ADAPTER:
+ pxenv_call.undi_reset_adapter = pxenv_undi_reset_adapter;
+ param_len = sizeof ( pxenv_any.undi_reset_adapter );
+ break;
+ case PXENV_UNDI_SHUTDOWN:
+ pxenv_call.undi_shutdown = pxenv_undi_shutdown;
+ param_len = sizeof ( pxenv_any.undi_shutdown );
+ break;
+ case PXENV_UNDI_OPEN:
+ pxenv_call.undi_open = pxenv_undi_open;
+ param_len = sizeof ( pxenv_any.undi_open );
+ break;
+ case PXENV_UNDI_CLOSE:
+ pxenv_call.undi_close = pxenv_undi_close;
+ param_len = sizeof ( pxenv_any.undi_close );
+ break;
+ case PXENV_UNDI_TRANSMIT:
+ pxenv_call.undi_transmit = pxenv_undi_transmit;
+ param_len = sizeof ( pxenv_any.undi_transmit );
+ break;
+ case PXENV_UNDI_SET_MCAST_ADDRESS:
+ pxenv_call.undi_set_mcast_address =
+ pxenv_undi_set_mcast_address;
+ param_len = sizeof ( pxenv_any.undi_set_mcast_address );
+ break;
+ case PXENV_UNDI_SET_STATION_ADDRESS:
+ pxenv_call.undi_set_station_address =
+ pxenv_undi_set_station_address;
+ param_len = sizeof ( pxenv_any.undi_set_station_address );
+ break;
+ case PXENV_UNDI_SET_PACKET_FILTER:
+ pxenv_call.undi_set_packet_filter =
+ pxenv_undi_set_packet_filter;
+ param_len = sizeof ( pxenv_any.undi_set_packet_filter );
+ break;
+ case PXENV_UNDI_GET_INFORMATION:
+ pxenv_call.undi_get_information = pxenv_undi_get_information;
+ param_len = sizeof ( pxenv_any.undi_get_information );
+ break;
+ case PXENV_UNDI_GET_STATISTICS:
+ pxenv_call.undi_get_statistics = pxenv_undi_get_statistics;
+ param_len = sizeof ( pxenv_any.undi_get_statistics );
+ break;
+ case PXENV_UNDI_CLEAR_STATISTICS:
+ pxenv_call.undi_clear_statistics = pxenv_undi_clear_statistics;
+ param_len = sizeof ( pxenv_any.undi_clear_statistics );
+ break;
+ case PXENV_UNDI_INITIATE_DIAGS:
+ pxenv_call.undi_initiate_diags = pxenv_undi_initiate_diags;
+ param_len = sizeof ( pxenv_any.undi_initiate_diags );
+ break;
+ case PXENV_UNDI_FORCE_INTERRUPT:
+ pxenv_call.undi_force_interrupt = pxenv_undi_force_interrupt;
+ param_len = sizeof ( pxenv_any.undi_force_interrupt );
+ break;
+ case PXENV_UNDI_GET_MCAST_ADDRESS:
+ pxenv_call.undi_get_mcast_address =
+ pxenv_undi_get_mcast_address;
+ param_len = sizeof ( pxenv_any.undi_get_mcast_address );
+ break;
+ case PXENV_UNDI_GET_NIC_TYPE:
+ pxenv_call.undi_get_nic_type = pxenv_undi_get_nic_type;
+ param_len = sizeof ( pxenv_any.undi_get_nic_type );
+ break;
+ case PXENV_UNDI_GET_IFACE_INFO:
+ pxenv_call.undi_get_iface_info = pxenv_undi_get_iface_info;
+ param_len = sizeof ( pxenv_any.undi_get_iface_info );
+ break;
+ case PXENV_UNDI_ISR:
+ pxenv_call.undi_isr = pxenv_undi_isr;
+ param_len = sizeof ( pxenv_any.undi_isr );
+ break;
+ case PXENV_FILE_OPEN:
+ pxenv_call.file_open = pxenv_file_open;
+ param_len = sizeof ( pxenv_any.file_open );
+ break;
+ case PXENV_FILE_CLOSE:
+ pxenv_call.file_close = pxenv_file_close;
+ param_len = sizeof ( pxenv_any.file_close );
+ break;
+ case PXENV_FILE_SELECT:
+ pxenv_call.file_select = pxenv_file_select;
+ param_len = sizeof ( pxenv_any.file_select );
+ break;
+ case PXENV_FILE_READ:
+ pxenv_call.file_read = pxenv_file_read;
+ param_len = sizeof ( pxenv_any.file_read );
+ break;
+ case PXENV_GET_FILE_SIZE:
+ pxenv_call.get_file_size = pxenv_get_file_size;
+ param_len = sizeof ( pxenv_any.get_file_size );
+ break;
+ case PXENV_FILE_EXEC:
+ pxenv_call.file_exec = pxenv_file_exec;
+ param_len = sizeof ( pxenv_any.file_exec );
+ break;
+ case PXENV_FILE_API_CHECK:
+ pxenv_call.file_api_check = pxenv_file_api_check;
+ param_len = sizeof ( pxenv_any.file_api_check );
+ break;
+ default:
+ DBG ( "PXENV_UNKNOWN_%hx", opcode );
+ pxenv_call.unknown = pxenv_unknown;
+ param_len = sizeof ( pxenv_any.unknown );
+ break;
+ }
+
+ /* Copy parameter block from caller */
+ copy_from_user ( &pxenv_any, parameters, 0, param_len );
+
+ /* Set default status in case child routine fails to do so */
+ pxenv_any.Status = PXENV_STATUS_FAILURE;
+
+ /* Hand off to relevant API routine */
+ DBG ( "[" );
+ ret = pxenv_call.any ( &pxenv_any );
+ if ( pxenv_any.Status != PXENV_STATUS_SUCCESS ) {
+ DBG ( " %02x", pxenv_any.Status );
+ }
+ if ( ret != PXENV_EXIT_SUCCESS ) {
+ DBG ( ret == PXENV_EXIT_FAILURE ? " err" : " ??" );
+ }
+ DBG ( "]" );
+
+ /* Copy modified parameter block back to caller and return */
+ copy_to_user ( parameters, 0, &pxenv_any, param_len );
+ ix86->regs.ax = ret;
+}
+
+/**
+ * Dispatch PXE loader call
+ *
+ * @v es:di Address of PXE parameter block
+ * @ret ax PXE exit code
+ */
+__cdecl void pxe_loader_call ( struct i386_all_regs *ix86 ) {
+ userptr_t uparams = real_to_user ( ix86->segs.es, ix86->regs.di );
+ struct s_UNDI_LOADER params;
+ PXENV_EXIT_t ret;
+
+ /* Copy parameter block from caller */
+ copy_from_user ( &params, uparams, 0, sizeof ( params ) );
+
+ /* Set default status in case child routine fails to do so */
+ params.Status = PXENV_STATUS_FAILURE;
+
+ /* Call UNDI loader */
+ ret = undi_loader ( &params );
+
+ /* Copy modified parameter block back to caller and return */
+ copy_to_user ( uparams, 0, &params, sizeof ( params ) );
+ ix86->regs.ax = ret;
+}
+
+/**
+ * Hook INT 1A for PXE
+ *
+ */
+void pxe_hook_int1a ( void ) {
+ hook_bios_interrupt ( 0x1a, ( unsigned int ) pxe_int_1a,
+ &pxe_int_1a_vector );
+}
+
+/**
+ * Unhook INT 1A for PXE
+ *
+ * @ret rc Return status code
+ */
+int pxe_unhook_int1a ( void ) {
+ return unhook_bios_interrupt ( 0x1a, ( unsigned int ) pxe_int_1a,
+ &pxe_int_1a_vector );
+}
+
+/**
+ * Calculate byte checksum as used by PXE
+ *
+ * @v data Data
+ * @v size Length of data
+ * @ret sum Checksum
+ */
+static uint8_t pxe_checksum ( void *data, size_t size ) {
+ uint8_t *bytes = data;
+ uint8_t sum = 0;
+
+ while ( size-- ) {
+ sum += *bytes++;
+ }
+ return sum;
+}
+
+/**
+ * Initialise !PXE and PXENV+ structures
+ *
+ */
+void pxe_init_structures ( void ) {
+ uint32_t rm_cs_phys = ( rm_cs << 4 );
+ uint32_t rm_ds_phys = ( rm_ds << 4 );
+
+ /* Fill in missing segment fields */
+ ppxe.EntryPointSP.segment = rm_cs;
+ ppxe.EntryPointESP.segment = rm_cs;
+ ppxe.Stack.segment_address = rm_ds;
+ ppxe.Stack.Physical_address = rm_ds_phys;
+ ppxe.UNDIData.segment_address = rm_ds;
+ ppxe.UNDIData.Physical_address = rm_ds_phys;
+ ppxe.UNDICode.segment_address = rm_cs;
+ ppxe.UNDICode.Physical_address = rm_cs_phys;
+ ppxe.UNDICodeWrite.segment_address = rm_cs;
+ ppxe.UNDICodeWrite.Physical_address = rm_cs_phys;
+ pxenv.RMEntry.segment = rm_cs;
+ pxenv.StackSeg = rm_ds;
+ pxenv.UNDIDataSeg = rm_ds;
+ pxenv.UNDICodeSeg = rm_cs;
+ pxenv.PXEPtr.segment = rm_cs;
+
+ /* Update checksums */
+ 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;
+}
diff --git a/gpxe/src/arch/i386/interface/pxe/pxe_entry.S b/gpxe/src/arch/i386/interface/pxe/pxe_entry.S
new file mode 100644
index 00000000..204894ef
--- /dev/null
+++ b/gpxe/src/arch/i386/interface/pxe/pxe_entry.S
@@ -0,0 +1,195 @@
+/*
+ * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+ .arch i386
+ .section ".text16", "awx", @progbits
+ .section ".text16.data", "aw", @progbits
+ .section ".data16", "aw", @progbits
+
+/****************************************************************************
+ * !PXE structure
+ ****************************************************************************
+ */
+ .section ".text16.data"
+ .globl ppxe
+ .align 16
+ppxe:
+ .ascii "!PXE" /* Signature */
+ .byte pxe_length /* StructLength */
+ .byte 0 /* StructCksum */
+ .byte 0 /* StructRev */
+ .byte 0 /* reserved_1 */
+ .word 0, 0 /* UNDIROMID */
+ .word 0, 0 /* BaseROMID */
+ .word pxe_entry_sp, 0 /* EntryPointSP */
+ .word pxe_entry_esp, 0 /* EntryPointESP */
+ .word -1, -1 /* StatusCallout */
+ .byte 0 /* reserved_2 */
+ .byte SegDescCnt /* SegDescCnt */
+ .word 0 /* FirstSelector */
+pxe_segments:
+ .word 0, 0, 0, _data16_size /* Stack */
+ .word 0, 0, 0, _data16_size /* UNDIData */
+ .word 0, 0, 0, _text16_size /* UNDICode */
+ .word 0, 0, 0, _text16_size /* UNDICodeWrite */
+ .word 0, 0, 0, 0 /* BC_Data */
+ .word 0, 0, 0, 0 /* BC_Code */
+ .word 0, 0, 0, 0 /* BC_CodeWrite */
+ .equ SegDescCnt, ( ( . - pxe_segments ) / 8 )
+ .equ pxe_length, . - ppxe
+ .size ppxe, . - ppxe
+
+/****************************************************************************
+ * PXENV+ structure
+ ****************************************************************************
+ */
+ .section ".text16.data"
+ .globl pxenv
+ .align 16
+pxenv:
+ .ascii "PXENV+" /* Signature */
+ .word 0x0201 /* Version */
+ .byte pxenv_length /* Length */
+ .byte 0 /* Checksum */
+ .word pxenv_entry, 0 /* RMEntry */
+ .long 0 /* PMEntry */
+ .word 0 /* PMSelector */
+ .word 0 /* StackSeg */
+ .word _data16_size /* StackSize */
+ .word 0 /* BC_CodeSeg */
+ .word 0 /* BC_CodeSize */
+ .word 0 /* BC_DataSeg */
+ .word 0 /* BC_DataSize */
+ .word 0 /* UNDIDataSeg */
+ .word _data16_size /* UNDIDataSize */
+ .word 0 /* UNDICodeSeg */
+ .word _text16_size /* UNDICodeSize */
+ .word ppxe, 0 /* PXEPtr */
+ .equ pxenv_length, . - pxenv
+ .size pxenv, . - pxenv
+
+/****************************************************************************
+ * pxenv_entry (16-bit far call)
+ *
+ * PXE API call PXENV+ entry point
+ *
+ * Parameters:
+ * %es:di : Far pointer to PXE parameter structure
+ * %bx : PXE API call
+ * Returns:
+ * %ax : PXE exit status
+ * Corrupts:
+ * none
+ ****************************************************************************
+ */
+ .section ".text16"
+ .code16
+pxenv_entry:
+ pushl $pxe_api_call
+ pushw %cs
+ call prot_call
+ addl $4, %esp
+ lret
+ .size pxenv_entry, . - pxenv_entry
+
+/****************************************************************************
+ * pxe_entry
+ *
+ * PXE API call !PXE entry point
+ *
+ * Parameters:
+ * stack : Far pointer to PXE parameter structure
+ * stack : PXE API call
+ * Returns:
+ * %ax : PXE exit status
+ * Corrupts:
+ * none
+ ****************************************************************************
+ */
+ .section ".text16"
+ .code16
+pxe_entry:
+pxe_entry_sp:
+ /* Preserve original %esp */
+ pushl %esp
+ /* Zero high word of %esp to allow use of common code */
+ movzwl %sp, %esp
+ jmp pxe_entry_common
+pxe_entry_esp:
+ /* Preserve %esp to match behaviour of pxe_entry_sp */
+ pushl %esp
+pxe_entry_common:
+ /* Save PXENV+ API call registers */
+ pushw %es
+ pushw %di
+ pushw %bx
+ /* Load !PXE parameters from stack into PXENV+ registers */
+ addr32 movw 18(%esp), %bx
+ movw %bx, %es
+ addr32 movw 16(%esp), %di
+ addr32 movw 14(%esp), %bx
+ /* Make call as for PXENV+ */
+ pushw %cs
+ call pxenv_entry
+ /* Restore PXENV+ registers */
+ popw %bx
+ popw %di
+ popw %es
+ /* Restore original %esp and return */
+ popl %esp
+ lret
+ .size pxe_entry, . - pxe_entry
+
+/****************************************************************************
+ * pxe_int_1a
+ *
+ * PXE INT 1A handler
+ *
+ * Parameters:
+ * %ax : 0x5650
+ * Returns:
+ * %ax : 0x564e
+ * %es:bx : Far pointer to the PXENV+ structure
+ * CF cleared
+ * Corrupts:
+ * none
+ ****************************************************************************
+ */
+ .section ".text16"
+ .code16
+ .globl pxe_int_1a
+pxe_int_1a:
+ pushfw
+ cmpw $0x5650, %ax
+ jne 1f
+ /* INT 1A,5650 - PXE installation check */
+ pushw %cs
+ popw %es
+ movw $pxenv, %bx
+ movw $0x564e, %ax
+ popfw
+ clc
+ lret $2
+1: /* INT 1A,other - pass through */
+ popfw
+ ljmp *%cs:pxe_int_1a_vector
+
+ .section ".text16.data"
+ .globl pxe_int_1a_vector
+pxe_int_1a_vector: .long 0