2 * QEMU PowerPC e500v2 ePAPR spinning code
4 * Copyright (C) 2011 Freescale Semiconductor, Inc. All rights reserved.
6 * Author: Alexander Graf, <agraf@suse.de>
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 2.1 of the License, or (at your option) any later version.
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.
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/>.
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.
26 * https://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.1.pdf
30 #include "qemu/osdep.h"
31 #include "qemu/module.h"
32 #include "qemu/units.h"
34 #include "hw/sysbus.h"
35 #include "sysemu/hw_accel.h"
37 #include "qom/object.h"
41 typedef struct spin_info {
47 } QEMU_PACKED SpinInfo;
49 #define TYPE_E500_SPIN "e500-spin"
50 OBJECT_DECLARE_SIMPLE_TYPE(SpinState, E500_SPIN)
53 SysBusDevice parent_obj;
56 SpinInfo spin[MAX_CPUS];
59 static void spin_reset(DeviceState *dev)
61 SpinState *s = E500_SPIN(dev);
64 for (i = 0; i < MAX_CPUS; i++) {
65 SpinInfo *info = &s->spin[i];
69 stq_p(&info->addr, 1);
73 static void mmubooke_create_initial_mapping(CPUPPCState *env,
78 ppcmas_tlb_t *tlb = booke206_get_tlbm(env, 1, 0, 1);
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;
87 env->tlb_dirty = true;
91 static void spin_kick(CPUState *cs, run_on_cpu_data data)
93 PowerPCCPU *cpu = POWERPC_CPU(cs);
94 CPUPPCState *env = &cpu->env;
95 SpinInfo *curspin = data.host_ptr;
96 hwaddr map_size = 64 * MiB;
99 cpu_synchronize_state(cs);
100 stl_p(&curspin->pir, env->spr[SPR_BOOKE_PIR]);
101 env->nip = ldq_p(&curspin->addr) & (map_size - 1);
102 env->gpr[3] = ldq_p(&curspin->r3);
106 env->gpr[7] = map_size;
110 map_start = ldq_p(&curspin->addr) & ~(map_size - 1);
111 mmubooke_create_initial_mapping(env, 0, map_start, map_size);
114 cs->exception_index = -1;
119 static void spin_write(void *opaque, hwaddr addr, uint64_t value,
122 SpinState *s = opaque;
123 int env_idx = addr / sizeof(SpinInfo);
125 SpinInfo *curspin = &s->spin[env_idx];
126 uint8_t *curspin_p = (uint8_t*)curspin;
128 cpu = qemu_get_cpu(env_idx);
134 if (cpu->cpu_index == 0) {
135 /* primary CPU doesn't spin */
139 curspin_p = &curspin_p[addr % sizeof(SpinInfo)];
142 stb_p(curspin_p, value);
145 stw_p(curspin_p, value);
148 stl_p(curspin_p, value);
152 if (!(ldq_p(&curspin->addr) & 1)) {
154 run_on_cpu(cpu, spin_kick, RUN_ON_CPU_HOST_PTR(curspin));
158 static uint64_t spin_read(void *opaque, hwaddr addr, unsigned len)
160 SpinState *s = opaque;
161 uint8_t *spin_p = &((uint8_t*)s->spin)[addr];
165 return ldub_p(spin_p);
167 return lduw_p(spin_p);
169 return ldl_p(spin_p);
171 hw_error("ppce500: unexpected %s with len = %u", __func__, len);
175 static const MemoryRegionOps spin_rw_ops = {
178 .endianness = DEVICE_BIG_ENDIAN,
181 static void ppce500_spin_initfn(Object *obj)
183 SysBusDevice *dev = SYS_BUS_DEVICE(obj);
184 SpinState *s = E500_SPIN(dev);
186 memory_region_init_io(&s->iomem, obj, &spin_rw_ops, s,
187 "e500 spin pv device", sizeof(SpinInfo) * MAX_CPUS);
188 sysbus_init_mmio(dev, &s->iomem);
191 static void ppce500_spin_class_init(ObjectClass *klass, void *data)
193 DeviceClass *dc = DEVICE_CLASS(klass);
195 dc->reset = spin_reset;
198 static const TypeInfo ppce500_spin_info = {
199 .name = TYPE_E500_SPIN,
200 .parent = TYPE_SYS_BUS_DEVICE,
201 .instance_size = sizeof(SpinState),
202 .instance_init = ppce500_spin_initfn,
203 .class_init = ppce500_spin_class_init,
206 static void ppce500_spin_register_types(void)
208 type_register_static(&ppce500_spin_info);
211 type_init(ppce500_spin_register_types)