pxe_call.S revision 1.2.8.2
1 1.2.8.2 jdolecek /* $NetBSD: pxe_call.S,v 1.2.8.2 2002/06/23 17:37:36 jdolecek Exp $ */ 2 1.2.8.2 jdolecek 3 1.2.8.2 jdolecek /* 4 1.2.8.2 jdolecek * Copyright 2001 Wasabi Systems, Inc. 5 1.2.8.2 jdolecek * All rights reserved. 6 1.2.8.2 jdolecek * 7 1.2.8.2 jdolecek * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 1.2.8.2 jdolecek * 9 1.2.8.2 jdolecek * Redistribution and use in source and binary forms, with or without 10 1.2.8.2 jdolecek * modification, are permitted provided that the following conditions 11 1.2.8.2 jdolecek * are met: 12 1.2.8.2 jdolecek * 1. Redistributions of source code must retain the above copyright 13 1.2.8.2 jdolecek * notice, this list of conditions and the following disclaimer. 14 1.2.8.2 jdolecek * 2. Redistributions in binary form must reproduce the above copyright 15 1.2.8.2 jdolecek * notice, this list of conditions and the following disclaimer in the 16 1.2.8.2 jdolecek * documentation and/or other materials provided with the distribution. 17 1.2.8.2 jdolecek * 3. All advertising materials mentioning features or use of this software 18 1.2.8.2 jdolecek * must display the following acknowledgement: 19 1.2.8.2 jdolecek * This product includes software developed for the NetBSD Project by 20 1.2.8.2 jdolecek * Wasabi Systems, Inc. 21 1.2.8.2 jdolecek * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 1.2.8.2 jdolecek * or promote products derived from this software without specific prior 23 1.2.8.2 jdolecek * written permission. 24 1.2.8.2 jdolecek * 25 1.2.8.2 jdolecek * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 1.2.8.2 jdolecek * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 1.2.8.2 jdolecek * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 1.2.8.2 jdolecek * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 1.2.8.2 jdolecek * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 1.2.8.2 jdolecek * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 1.2.8.2 jdolecek * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 1.2.8.2 jdolecek * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 1.2.8.2 jdolecek * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 1.2.8.2 jdolecek * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 1.2.8.2 jdolecek * POSSIBILITY OF SUCH DAMAGE. 36 1.2.8.2 jdolecek */ 37 1.2.8.2 jdolecek 38 1.2.8.2 jdolecek /* 39 1.2.8.2 jdolecek * Low level PXE BIOS call glue. 40 1.2.8.2 jdolecek */ 41 1.2.8.2 jdolecek 42 1.2.8.2 jdolecek #include <machine/asm.h> 43 1.2.8.2 jdolecek 44 1.2.8.2 jdolecek #define addr32 .byte 0x67 45 1.2.8.2 jdolecek #define data32 .byte 0x66 46 1.2.8.2 jdolecek #define farcall .byte 0x9a 47 1.2.8.2 jdolecek 48 1.2.8.2 jdolecek ENTRY(pxecall_bangpxe) 49 1.2.8.2 jdolecek pushl %ebp 50 1.2.8.2 jdolecek movl %esp, %ebp 51 1.2.8.2 jdolecek pushl %ebx 52 1.2.8.2 jdolecek pushl %ecx 53 1.2.8.2 jdolecek pushl %edx 54 1.2.8.2 jdolecek 55 1.2.8.2 jdolecek /* For simplicity, just move all 32 bits. */ 56 1.2.8.2 jdolecek movl 8(%ebp), %ebx 57 1.2.8.2 jdolecek 58 1.2.8.2 jdolecek pushw _C_LABEL(pxe_command_buf_seg) 59 1.2.8.2 jdolecek pushw _C_LABEL(pxe_command_buf_off) 60 1.2.8.2 jdolecek pushw %bx 61 1.2.8.2 jdolecek 62 1.2.8.2 jdolecek call _C_LABEL(prot_to_real) # enter real mode 63 1.2.8.2 jdolecek 64 1.2.8.2 jdolecek /* The encoding is: 0x9a offlo offhi seglo seghi */ 65 1.2.8.2 jdolecek farcall 66 1.2.8.2 jdolecek .globl _C_LABEL(bangpxe_off) 67 1.2.8.2 jdolecek _C_LABEL(bangpxe_off): 68 1.2.8.2 jdolecek .word 0 69 1.2.8.2 jdolecek .globl _C_LABEL(bangpxe_seg) 70 1.2.8.2 jdolecek _C_LABEL(bangpxe_seg): 71 1.2.8.2 jdolecek .word 0 72 1.2.8.2 jdolecek 73 1.2.8.2 jdolecek data32 74 1.2.8.2 jdolecek call _C_LABEL(real_to_prot) # leave real mode 75 1.2.8.2 jdolecek 76 1.2.8.2 jdolecek add $6, %esp 77 1.2.8.2 jdolecek 78 1.2.8.2 jdolecek popl %edx 79 1.2.8.2 jdolecek popl %ecx 80 1.2.8.2 jdolecek popl %ebx 81 1.2.8.2 jdolecek popl %ebp 82 1.2.8.2 jdolecek ret 83 1.2.8.2 jdolecek 84 1.2.8.2 jdolecek ENTRY(pxecall_pxenv) 85 1.2.8.2 jdolecek pushl %ebp 86 1.2.8.2 jdolecek movl %esp, %ebp 87 1.2.8.2 jdolecek pushl %ebx 88 1.2.8.2 jdolecek pushl %ecx 89 1.2.8.2 jdolecek pushl %edx 90 1.2.8.2 jdolecek pushl %edi 91 1.2.8.2 jdolecek 92 1.2.8.2 jdolecek /* For simplicity, just move all 32 bits. */ 93 1.2.8.2 jdolecek movl 8(%ebp), %ebx 94 1.2.8.2 jdolecek 95 1.2.8.2 jdolecek call _C_LABEL(prot_to_real) # enter real mode 96 1.2.8.2 jdolecek 97 1.2.8.2 jdolecek /* prot_to_real() has already set %es to BOOTSEG */ 98 1.2.8.2 jdolecek addr32 99 1.2.8.2 jdolecek leal _C_LABEL(pxe_command_buf), %edi 100 1.2.8.2 jdolecek 101 1.2.8.2 jdolecek /* The encoding is: 0x9a offlo offhi seglo seghi */ 102 1.2.8.2 jdolecek farcall 103 1.2.8.2 jdolecek .globl _C_LABEL(pxenv_off) 104 1.2.8.2 jdolecek _C_LABEL(pxenv_off): 105 1.2.8.2 jdolecek .word 0 106 1.2.8.2 jdolecek .globl _C_LABEL(pxenv_seg) 107 1.2.8.2 jdolecek _C_LABEL(pxenv_seg): 108 1.2.8.2 jdolecek .word 0 109 1.2.8.2 jdolecek 110 1.2.8.2 jdolecek data32 111 1.2.8.2 jdolecek call _C_LABEL(real_to_prot) # leave real mode 112 1.2.8.2 jdolecek 113 1.2.8.2 jdolecek popl %edi 114 1.2.8.2 jdolecek popl %edx 115 1.2.8.2 jdolecek popl %ecx 116 1.2.8.2 jdolecek popl %ebx 117 1.2.8.2 jdolecek popl %ebp 118 1.2.8.2 jdolecek ret 119
Indexes created Thu Oct 23 22:10:10 GMT 2025