1/* $OpenBSD: start.S,v 1.6 2011/06/05 21:49:36 miod Exp $ */ 2/* $NetBSD: start.S,v 1.4 1996/10/17 02:50:40 cgd Exp $ */ 3 4/* 5 * Mach Operating System 6 * Copyright (c) 1992 Carnegie Mellon University 7 * All Rights Reserved. 8 * 9 * Permission to use, copy, modify and distribute this software and its 10 * documentation is hereby granted, provided that both the copyright 11 * notice and this permission notice appear in all copies of the 12 * software, derivative works or modified versions, and any portions 13 * thereof, and that both notices appear in supporting documentation. 14 * 15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 17 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 18 * 19 * Carnegie Mellon requests users of this software to return to 20 * 21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 22 * School of Computer Science 23 * Carnegie Mellon University 24 * Pittsburgh PA 15213-3890 25 * 26 * any improvements or extensions that they make and grant Carnegie Mellon 27 * the rights to redistribute these changes. 28 */ 29 30#include "include/asm.h" 31 32/* 33 * start -- 34 * Entry point for boot/standalone programs. 35 * 36 * Arguments: 37 * a0 long (first free physical page) 38 * 39 * This is where the prom comes to. Leaves all exception and interrupts 40 * to prom, runs off prom's stack too. No return values. 41 */ 42 .text 43 .set noreorder /* don't reorder instructions */ 44 45#define ENTRY_FRAME 32 46 47NESTED(start, 1, ENTRY_FRAME, ra, 0, 0) 48 br pv,Lstartgp 49Lstartgp: 50 LDGP(pv) 51 52 lda sp,start 53#ifdef PRIMARY_BOOTBLOCK 54 lda sp,0x30000-ENTRY_FRAME(sp) 55#else 56 lda sp,-ENTRY_FRAME(sp) /* start stack below text */ 57#endif 58 59 or a0,zero,s0 60 lda a0,_edata 61 lda a1,_end 62 subq a1,a0,a1 63 CALL(bzero) 64 or s0,zero,a0 65 66 CALL(main) /* transfer to C */ 67 68XLEAF(_rtt, 0) 69XLEAF(halt, 0) 70 call_pal PAL_halt /* halt if we ever return */ 71END(start) 72 73/* 74 * Dummy routine for GCC2. 75 */ 76LEAF(__main,0) 77 RET 78END(__main) 79 80/* 81 * cpu_number 82 * Return the cpu number, using the whami instruction. 83 */ 84LEAF(cpu_number, 0) 85 call_pal PAL_VMS_mfpr_whami 86 RET 87END(cpu_number) 88