1/* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22/* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27#include <sys/asm_linkage.h> 28#include <sys/privregs.h> 29#include <sys/scb.h> 30#include <sys/machparam.h> 31#include <sys/machthread.h> 32 33#include "assym.h" 34 35/* 36 * void 37 * reestablish_curthread(void) 38 * - reestablishes the invariant that THREAD_REG contains 39 * the same value as the cpu struct for this cpu (implicit from 40 * where we're running). This is needed for OBP callback routines. 41 * The CPU_ADDR macro figures out the cpuid by reading hardware registers. 42 */ 43 44 ENTRY_NP(reestablish_curthread) 45 46 CPU_ADDR(%o0, %o1) 47 retl 48 ldn [%o0 + CPU_THREAD], THREAD_REG 49 SET_SIZE(reestablish_curthread) 50 51 52/* 53 * Return the current THREAD pointer. 54 * This is also available as an inline function. 55 */ 56 57 ENTRY_NP(threadp) 58 retl 59 mov THREAD_REG, %o0 60 SET_SIZE(threadp) 61 62 63/* 64 * The IEEE 1275-1994 callback handler for a 64-bit SPARC V9 PROM calling 65 * a 32 bit client program. The PROM calls us with a 64 bit stack and a 66 * pointer to a client interface argument array in %o0. The called code 67 * returns 0 if the call succeeded (i.e. the service name exists) or -1 68 * if the call failed. NOTE: All addresses are in the range 0..2^^32-1 69 * 70 * This code is called as trusted subroutine of the firmware, and is 71 * called with %tba pointing to the boot firmware's trap table. All of 72 * the prom's window handlers are mixed mode handlers. 73 */ 74 75 ENTRY_NP(callback_handler) 76 ! 77 ! We assume we are called with a 64 bit stack with PSTATE_AM clear 78 ! 79 save %sp, -SA64(MINFRAME64), %sp ! 64 bit save 80 rdpr %wstate, %l5 ! save %wstate 81 andn %l5, WSTATE_MASK, %l6 82 wrpr %l6, WSTATE_KMIX, %wstate 83 rdpr %pstate, %l0 ! save %pstate 84 85 ! 86 ! If anybody tries to trace the call stack of this callback 87 ! then the traceback should stop here. This matters 88 ! particularly for sync callbacks on Serengeti, but it's a 89 ! good idea generally. 90 ! 91 flushw 92 mov %fp, %l1 93 clr %fp ! terminate stack traces 94 95 call vx_handler ! vx_handler(void **arg_array) 96 mov %i0, %o0 ! delay; argument array 97 sra %o0, 0, %i0 ! sign extend result 98 99 mov %l1, %fp ! restore %fp for return 100 1011: wrpr %g0, %l0, %pstate ! restore %pstate 102 wrpr %g0, %l5, %wstate ! restore %wstate 103 104 ret ! return result in %o0 105 restore ! back to a 64 bit stack 106 SET_SIZE(callback_handler) 107 108