1/* $NetBSD: pxe_call.S,v 1.5 2013/10/20 19:47:28 christos Exp $ */ 2 3/* 4 * Copyright 2001 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38/* 39 * Low level PXE BIOS call glue. 40 */ 41 42#include <machine/asm.h> 43 44ENTRY(pxecall_bangpxe) 45 pushl %ebp 46 movl %esp, %ebp 47 pushl %ebx 48 pushl %ecx 49 pushl %edx 50 51 /* For simplicity, just move all 32 bits. */ 52 movl 8(%ebp), %ebx 53 54 pushw _C_LABEL(pxe_command_buf_seg) 55 pushw _C_LABEL(pxe_command_buf_off) 56 pushw %bx 57 58 call _C_LABEL(prot_to_real) # enter real mode 59 .code16 60 61 /* The encoding is: 0x9a offlo offhi seglo seghi */ 62 lcall $0, $0xffff 63 .globl _C_LABEL(bangpxe_off) 64_C_LABEL(bangpxe_off) = . - 4 65 .globl _C_LABEL(bangpxe_seg) 66_C_LABEL(bangpxe_seg) = . - 2 67 68 calll _C_LABEL(real_to_prot) # leave real mode 69 .code32 70 71 add $6, %esp 72 73 popl %edx 74 popl %ecx 75 popl %ebx 76 popl %ebp 77 ret 78 79ENTRY(pxecall_pxenv) 80 pushl %ebp 81 movl %esp, %ebp 82 pushl %ebx 83 pushl %ecx 84 pushl %edx 85 pushl %edi 86 87 /* For simplicity, just move all 32 bits. */ 88 movl 8(%ebp), %ebx 89 90 call _C_LABEL(prot_to_real) # enter real mode 91 .code16 92 93 /* prot_to_real() has already set %es to BOOTSEG */ 94 lea _C_LABEL(pxe_command_buf), %di 95 96 /* The encoding is: 0x9a offlo offhi seglo seghi */ 97 lcall $0, $0xffff 98 .globl _C_LABEL(pxenv_off) 99_C_LABEL(pxenv_off) = . - 4 100 .globl _C_LABEL(pxenv_seg) 101_C_LABEL(pxenv_seg) = . - 2 102 103 calll _C_LABEL(real_to_prot) # leave real mode 104 .code32 105 106 popl %edi 107 popl %edx 108 popl %ecx 109 popl %ebx 110 popl %ebp 111 ret 112 113 .globl _C_LABEL(pxe_command_buf) 114 .align 32 115 .type _C_LABEL(pxe_command_buf), @object 116 .size _C_LABEL(pxe_command_buf), 256 117_C_LABEL(pxe_command_buf): 118 .zero 256 119