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 /* 28 * Assembly language support for physical big/little endian access of pcitool 29 * in the PCI drivers. 30 */ 31 32 #include <sys/asm_linkage.h> 33 #include <sys/machthread.h> 34 #include <sys/privregs.h> 35 36 /*LINTLIBRARY*/ 37 38 ! pci_do_phys_peek: Do physical address read. 39 ! 40 ! %o0 is size in bytes - Must be 8, 4, 2 or 1. Invalid sizes default to 1. 41 ! %o1 is address to read 42 ! %o2 is address to save value into 43 ! %o3 is 0 for little endian, non-zero for big endian 44 ! 45 ! To be called from an on_trap environment. 46 ! Interrupts will be disabled for the duration of the read, to prevent 47 ! an interrupt from raising the trap level to 1 and then a possible 48 ! data access exception being delivered while the trap level > 0. 49 ! 50 ! Assumes alignment is correct. 51 52 ENTRY(pci_do_phys_peek) 53 54 rdpr %pstate, %o4 ! Disable interrupts if not already 55 andcc %o4, PSTATE_IE, %g2 ! Save original state first 56 bz .peek_ints_disabled 57 nop 58 wrpr %o4, PSTATE_IE, %pstate 59 .peek_ints_disabled: 60 61 tst %o3 ! Set up %asi with modifier for 62 movz %xcc, ASI_IOL, %g1 ! Big/little endian physical space 63 movnz %xcc, ASI_IO, %g1 64 mov %g1, %asi 65 66 cmp %o0, 8 ! 64-bit? 67 bne .peek_int 68 cmp %o0, 4 ! 32-bit? 69 ldxa [%o1]%asi, %g1 70 ba .peekdone 71 stx %g1, [%o2] 72 73 .peek_int: 74 bne .peek_half 75 cmp %o0, 2 ! 16-bit? 76 lduwa [%o1]%asi, %g1 77 ba .peekdone 78 stuw %g1, [%o2] 79 80 .peek_half: 81 bne .peek_byte 82 nop 83 lduha [%o1]%asi, %g1 84 ba .peekdone 85 stuh %g1, [%o2] 86 87 .peek_byte: 88 lduba [%o1]%asi, %g1 ! 8-bit! 89 stub %g1, [%o2] 90 91 .peekdone: 92 membar #Sync ! Make sure the loads take 93 tst %g2 ! No need to reenable interrupts 94 bz .peek_ints_done ! if not enabled at entry 95 rdpr %pstate, %o4 96 wrpr %o4, PSTATE_IE, %pstate 97 .peek_ints_done: 98 mov %g0, %o0 99 retl 100 nop 101 SET_SIZE(pci_do_phys_peek) 102 103 104 ! pci_do_phys_poke: Do physical address write. 105 ! 106 ! %o0 is size in bytes - Must be 8, 4, 2 or 1. Invalid sizes default to 1. 107 ! %o1 is address to write to 108 ! %o2 is address to read from 109 ! %o3 is 0 for little endian, non-zero for big endian 110 ! 111 ! Always returns success (0) in %o0 112 ! 113 ! Assumes alignment is correct and that on_trap handling has been installed 114 115 ENTRY(pci_do_phys_poke) 116 117 tst %o3 118 bz .poke_asi_set 119 mov ASI_IOL, %asi 120 mov ASI_IO, %asi 121 .poke_asi_set: 122 123 cmp %o0, 8 ! 64 bit? 124 bne .poke_int 125 cmp %o0, 4 ! 32-bit? 126 ldx [%o2], %g1 127 ba .pokedone 128 stxa %g1, [%o1]%asi 129 130 .poke_int: 131 bne .poke_half 132 cmp %o0, 2 ! 16-bit? 133 lduw [%o2], %g1 134 ba .pokedone 135 stuwa %g1, [%o1]%asi 136 137 .poke_half: 138 bne .poke_byte 139 nop 140 lduh [%o2], %g1 141 ba .pokedone 142 stuha %g1, [%o1]%asi 143 144 .poke_byte: 145 ldub [%o2], %g1 ! 8-bit! 146 stuba %g1, [%o1]%asi 147 148 .pokedone: 149 membar #Sync 150 retl 151 mov %g0, %o0 152 SET_SIZE(pci_do_phys_poke) 153