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/*
* QEMU PowerPC e500v2 ePAPR spinning code
*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Alexander Graf, <agraf@suse.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
* This code is not really a device, but models an interface that usually
* firmware takes care of. It's used when QEMU plays the role of firmware.
*
* Specification:
*
* https://www.power.org/resources/downloads/Power_ePAPR_APPROVED_v1.1.pdf
*
*/
#include "hw.h"
#include "sysemu.h"
#include "sysbus.h"
#include "kvm.h"
#define MAX_CPUS 32
typedef struct spin_info {
uint64_t addr;
uint64_t r3;
uint32_t resv;
uint32_t pir;
uint64_t reserved;
} __attribute__ ((packed)) SpinInfo;
typedef struct spin_state {
SysBusDevice busdev;
MemoryRegion iomem;
SpinInfo spin[MAX_CPUS];
} SpinState;
typedef struct spin_kick {
CPUState *env;
SpinInfo *spin;
} SpinKick;
static void spin_reset(void *opaque)
{
SpinState *s = opaque;
int i;
for (i = 0; i < MAX_CPUS; i++) {
SpinInfo *info = &s->spin[i];
info->pir = i;
info->r3 = i;
info->addr = 1;
}
}
/* Create -kernel TLB entries for BookE, linearly spanning 256MB. */
static inline target_phys_addr_t booke206_page_size_to_tlb(uint64_t size)
{
return (ffs(size >> 10) - 1) >> 1;
}
static void mmubooke_create_initial_mapping(CPUState *env,
target_ulong va,
target_phys_addr_t pa,
target_phys_addr_t len)
{
ppcmas_tlb_t *tlb = booke206_get_tlbm(env, 1, 0, 1);
target_phys_addr_t size;
size = (booke206_page_size_to_tlb(len) << MAS1_TSIZE_SHIFT);
tlb->mas1 = MAS1_VALID | size;
tlb->mas2 = (va & TARGET_PAGE_MASK) | MAS2_M;
tlb->mas7_3 = pa & TARGET_PAGE_MASK;
tlb->mas7_3 |= MAS3_UR | MAS3_UW | MAS3_UX | MAS3_SR | MAS3_SW | MAS3_SX;
}
static void spin_kick(void *data)
{
SpinKick *kick = data;
CPUState *env = kick->env;
SpinInfo *curspin = kick->spin;
target_phys_addr_t map_size = 64 * 1024 * 1024;
target_phys_addr_t map_start;
cpu_synchronize_state(env);
stl_p(&curspin->pir, env->spr[SPR_PIR]);
env->nip = ldq_p(&curspin->addr) & (map_size - 1);
env->gpr[3] = ldq_p(&curspin->r3);
env->gpr[4] = 0;
env->gpr[5] = 0;
env->gpr[6] = 0;
env->gpr[7] = map_size;
env->gpr[8] = 0;
env->gpr[9] = 0;
map_start = ldq_p(&curspin->addr) & ~(map_size - 1);
mmubooke_create_initial_mapping(env, 0, map_start, map_size);
env->halted = 0;
env->exception_index = -1;
env->stopped = 0;
qemu_cpu_kick(env);
}
static void spin_write(void *opaque, target_phys_addr_t addr, uint64_t value,
unsigned len)
{
SpinState *s = opaque;
int env_idx = addr / sizeof(SpinInfo);
CPUState *env;
SpinInfo *curspin = &s->spin[env_idx];
uint8_t *curspin_p = (uint8_t*)curspin;
for (env = first_cpu; env != NULL; env = env->next_cpu) {
if (env->cpu_index == env_idx) {
break;
}
}
if (!env) {
/* Unknown CPU */
return;
}
if (!env->cpu_index) {
/* primary CPU doesn't spin */
return;
}
curspin_p = &curspin_p[addr % sizeof(SpinInfo)];
switch (len) {
case 1:
stb_p(curspin_p, value);
break;
case 2:
stw_p(curspin_p, value);
break;
case 4:
stl_p(curspin_p, value);
break;
}
if (!(ldq_p(&curspin->addr) & 1)) {
/* run CPU */
SpinKick kick = {
.env = env,
.spin = curspin,
};
run_on_cpu(env, spin_kick, &kick);
}
}
static uint64_t spin_read(void *opaque, target_phys_addr_t addr, unsigned len)
{
SpinState *s = opaque;
uint8_t *spin_p = &((uint8_t*)s->spin)[addr];
switch (len) {
case 1:
return ldub_p(spin_p);
case 2:
return lduw_p(spin_p);
case 4:
return ldl_p(spin_p);
default:
assert(0);
}
}
const MemoryRegionOps spin_rw_ops = {
.read = spin_read,
.write = spin_write,
.endianness = DEVICE_BIG_ENDIAN,
};
static int ppce500_spin_initfn(SysBusDevice *dev)
{
SpinState *s;
s = FROM_SYSBUS(SpinState, sysbus_from_qdev(dev));
memory_region_init_io(&s->iomem, &spin_rw_ops, s, "e500 spin pv device",
sizeof(SpinInfo) * MAX_CPUS);
sysbus_init_mmio(dev, &s->iomem);
qemu_register_reset(spin_reset, s);
return 0;
}
static SysBusDeviceInfo ppce500_spin_info = {
.init = ppce500_spin_initfn,
.qdev.name = "e500-spin",
.qdev.size = sizeof(SpinState),
};
static void ppce500_spin_register(void)
{
sysbus_register_withprop(&ppce500_spin_info);
}
device_init(ppce500_spin_register);
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