1 /* 2 * QEMU PowerPC e500v2 ePAPR spinning code 3 * 4 * Copyright (C) 2011 Freescale Semiconductor, Inc. All rights reserved. 5 * 6 * Author: Alexander Graf, <agraf@suse.de> 7 * 8 * This library is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public 10 * License as published by the Free Software Foundation; either 11 * version 2 of the License, or (at your option) any later version. 12 * 13 * This library is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with this library; if not, see <http://www.gnu.org/licenses/>. 20 * 21 * This code is not really a device, but models an interface that usually 22 * firmware takes care of. It's used when QEMU plays the role of firmware. 23 * 24 * Specification: 25 * 26 * https://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.1.pdf 27 * 28 */ 29 30 #include "qemu/osdep.h" 31 #include "qemu/module.h" 32 #include "qemu/units.h" 33 #include "hw/hw.h" 34 #include "hw/sysbus.h" 35 #include "sysemu/hw_accel.h" 36 #include "e500.h" 37 #include "qom/object.h" 38 39 #define MAX_CPUS 32 40 41 typedef struct spin_info { 42 uint64_t addr; 43 uint64_t r3; 44 uint32_t resv; 45 uint32_t pir; 46 uint64_t reserved; 47 } QEMU_PACKED SpinInfo; 48 49 #define TYPE_E500_SPIN "e500-spin" 50 OBJECT_DECLARE_SIMPLE_TYPE(SpinState, E500_SPIN) 51 52 struct SpinState { 53 SysBusDevice parent_obj; 54 55 MemoryRegion iomem; 56 SpinInfo spin[MAX_CPUS]; 57 }; 58 59 static void spin_reset(DeviceState *dev) 60 { 61 SpinState *s = E500_SPIN(dev); 62 int i; 63 64 for (i = 0; i < MAX_CPUS; i++) { 65 SpinInfo *info = &s->spin[i]; 66 67 stl_p(&info->pir, i); 68 stq_p(&info->r3, i); 69 stq_p(&info->addr, 1); 70 } 71 } 72 73 static void mmubooke_create_initial_mapping(CPUPPCState *env, 74 target_ulong va, 75 hwaddr pa, 76 hwaddr len) 77 { 78 ppcmas_tlb_t *tlb = booke206_get_tlbm(env, 1, 0, 1); 79 hwaddr size; 80 81 size = (booke206_page_size_to_tlb(len) << MAS1_TSIZE_SHIFT); 82 tlb->mas1 = MAS1_VALID | size; 83 tlb->mas2 = (va & TARGET_PAGE_MASK) | MAS2_M; 84 tlb->mas7_3 = pa & TARGET_PAGE_MASK; 85 tlb->mas7_3 |= MAS3_UR | MAS3_UW | MAS3_UX | MAS3_SR | MAS3_SW | MAS3_SX; 86 env->tlb_dirty = true; 87 } 88 89 static void spin_kick(CPUState *cs, run_on_cpu_data data) 90 { 91 PowerPCCPU *cpu = POWERPC_CPU(cs); 92 CPUPPCState *env = &cpu->env; 93 SpinInfo *curspin = data.host_ptr; 94 hwaddr map_size = 64 * MiB; 95 hwaddr map_start; 96 97 cpu_synchronize_state(cs); 98 stl_p(&curspin->pir, env->spr[SPR_BOOKE_PIR]); 99 env->nip = ldq_p(&curspin->addr) & (map_size - 1); 100 env->gpr[3] = ldq_p(&curspin->r3); 101 env->gpr[4] = 0; 102 env->gpr[5] = 0; 103 env->gpr[6] = 0; 104 env->gpr[7] = map_size; 105 env->gpr[8] = 0; 106 env->gpr[9] = 0; 107 108 map_start = ldq_p(&curspin->addr) & ~(map_size - 1); 109 mmubooke_create_initial_mapping(env, 0, map_start, map_size); 110 111 cs->halted = 0; 112 cs->exception_index = -1; 113 cs->stopped = false; 114 qemu_cpu_kick(cs); 115 } 116 117 static void spin_write(void *opaque, hwaddr addr, uint64_t value, 118 unsigned len) 119 { 120 SpinState *s = opaque; 121 int env_idx = addr / sizeof(SpinInfo); 122 CPUState *cpu; 123 SpinInfo *curspin = &s->spin[env_idx]; 124 uint8_t *curspin_p = (uint8_t*)curspin; 125 126 cpu = qemu_get_cpu(env_idx); 127 if (cpu == NULL) { 128 /* Unknown CPU */ 129 return; 130 } 131 132 if (cpu->cpu_index == 0) { 133 /* primary CPU doesn't spin */ 134 return; 135 } 136 137 curspin_p = &curspin_p[addr % sizeof(SpinInfo)]; 138 switch (len) { 139 case 1: 140 stb_p(curspin_p, value); 141 break; 142 case 2: 143 stw_p(curspin_p, value); 144 break; 145 case 4: 146 stl_p(curspin_p, value); 147 break; 148 } 149 150 if (!(ldq_p(&curspin->addr) & 1)) { 151 /* run CPU */ 152 run_on_cpu(cpu, spin_kick, RUN_ON_CPU_HOST_PTR(curspin)); 153 } 154 } 155 156 static uint64_t spin_read(void *opaque, hwaddr addr, unsigned len) 157 { 158 SpinState *s = opaque; 159 uint8_t *spin_p = &((uint8_t*)s->spin)[addr]; 160 161 switch (len) { 162 case 1: 163 return ldub_p(spin_p); 164 case 2: 165 return lduw_p(spin_p); 166 case 4: 167 return ldl_p(spin_p); 168 default: 169 hw_error("ppce500: unexpected %s with len = %u", __func__, len); 170 } 171 } 172 173 static const MemoryRegionOps spin_rw_ops = { 174 .read = spin_read, 175 .write = spin_write, 176 .endianness = DEVICE_BIG_ENDIAN, 177 }; 178 179 static void ppce500_spin_initfn(Object *obj) 180 { 181 SysBusDevice *dev = SYS_BUS_DEVICE(obj); 182 SpinState *s = E500_SPIN(dev); 183 184 memory_region_init_io(&s->iomem, obj, &spin_rw_ops, s, 185 "e500 spin pv device", sizeof(SpinInfo) * MAX_CPUS); 186 sysbus_init_mmio(dev, &s->iomem); 187 } 188 189 static void ppce500_spin_class_init(ObjectClass *klass, void *data) 190 { 191 DeviceClass *dc = DEVICE_CLASS(klass); 192 193 dc->reset = spin_reset; 194 } 195 196 static const TypeInfo ppce500_spin_info = { 197 .name = TYPE_E500_SPIN, 198 .parent = TYPE_SYS_BUS_DEVICE, 199 .instance_size = sizeof(SpinState), 200 .instance_init = ppce500_spin_initfn, 201 .class_init = ppce500_spin_class_init, 202 }; 203 204 static void ppce500_spin_register_types(void) 205 { 206 type_register_static(&ppce500_spin_info); 207 } 208 209 type_init(ppce500_spin_register_types) 210