1/* $NetBSD: cpufunc_asm_sa11x0.S,v 1.3 2002/08/17 16:36:32 thorpej Exp $ */ 2 3/*- 4 * Copyright (c) 2002 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#include <machine/asm.h> 40__FBSDID("$FreeBSD$"); 41 42 .data 43 .global _C_LABEL(sa11x0_idle_mem) 44_C_LABEL(sa11x0_idle_mem): 45 .word 0 46 47 .text 48 49 .align 5 50 51 /* We're now 32-byte aligned */ 52 53.Lsa11x0_idle_mem: 54 .word _C_LABEL(sa11x0_idle_mem) /* 1 */ 55 56/* 57 * sa11x0_cpusleep 58 * 59 * This is called when there is nothing on any of the run queues. 60 * We go into IDLE mode so that any IRQ or FIQ will awaken us. 61 */ 62ENTRY(sa11x0_cpu_sleep) 63 ldr r1, .Lsa11x0_idle_mem /* get address of... */ /* 2 */ 64 nop /* 3 */ 65 ldr r1, [r1] /* ...non-cacheable page */ /* 4 */ 66 nop /* 5 */ 67 68 /* 69 * SA-1110 manual, 9.5.2.1 (Entering Idle Mode) says that 70 * to enter idle mode: 71 * 72 * * Disable clock switching 73 * * Issue load from non-cacheable address 74 * * Issue "wait for interrupt" 75 * 76 * The 3-insn sequence must reside in the first 3 words 77 * of a cache line. 78 * 79 * We must disable interrupts in the CPSR so that we can 80 * re-enable clock switching before servicing interrupts. 81 */ 82 83 mrs r3, cpsr_all /* 6 */ 84 orr r2, r3, #(I32_bit|F32_bit) /* 7 */ 85 msr cpsr_all, r2 /* 8 */ 86 87 /* We're now 32-byte aligned */ 88 89 mcr p15, 0, r0, c15, c2, 2 /* disable clock switching */ 90 ldr r0, [r1] /* load from non-cacheable address */ 91 mcr p15, 0, r0, c15, c8, 2 /* wait for interrupt */ 92 93 mcr p15, 0, r0, c15, c1, 2 /* re-enable clock switching */ 94 95 /* Restore interrupts (which will cause them to be serviced). */ 96 msr cpsr_all, r3 97 RET 98 99 100/* 101 * This function is the same as sa110_context_switch for now, the plan 102 * is to make use of the process id register to avoid cache flushes. 103 */ 104ENTRY(sa11x0_context_switch) 105 /* 106 * CF_CACHE_PURGE_ID will *ALWAYS* be called prior to this. 107 * Thus the data cache will contain only kernel data and the 108 * instruction cache will contain only kernel code, and all 109 * kernel mappings are shared by all processes. 110 */ 111 112 /* Write the TTB */ 113 mcr p15, 0, r0, c2, c0, 0 114 115 /* If we have updated the TTB we must flush the TLB */ 116 mcr p15, 0, r0, c8, c7, 0 /* flush the I+D tlb */ 117 118 /* Make sure that pipeline is emptied */ 119 mov r0, r0 120 mov r0, r0 121 RET 122 123ENTRY(sa11x0_drain_readbuf) 124 mcr p15, 0, r0, c9, c0, 0 /* drain read buffer */ 125 RET 126