qemu-e2k/hw/core/register.c

314 lines
7.9 KiB
C

/*
* Register Definition API
*
* Copyright (c) 2016 Xilinx Inc.
* Copyright (c) 2013 Peter Crosthwaite <peter.crosthwaite@xilinx.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License
* for more details.
*/
#include "qemu/osdep.h"
#include "hw/register.h"
#include "hw/qdev.h"
#include "qemu/log.h"
static inline void register_write_val(RegisterInfo *reg, uint64_t val)
{
g_assert(reg->data);
switch (reg->data_size) {
case 1:
*(uint8_t *)reg->data = val;
break;
case 2:
*(uint16_t *)reg->data = val;
break;
case 4:
*(uint32_t *)reg->data = val;
break;
case 8:
*(uint64_t *)reg->data = val;
break;
default:
g_assert_not_reached();
}
}
static inline uint64_t register_read_val(RegisterInfo *reg)
{
switch (reg->data_size) {
case 1:
return *(uint8_t *)reg->data;
case 2:
return *(uint16_t *)reg->data;
case 4:
return *(uint32_t *)reg->data;
case 8:
return *(uint64_t *)reg->data;
default:
g_assert_not_reached();
}
return 0; /* unreachable */
}
static inline uint64_t register_enabled_mask(int data_size, unsigned size)
{
if (data_size < size) {
size = data_size;
}
return MAKE_64BIT_MASK(0, size * 8);
}
void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
const char *prefix, bool debug)
{
uint64_t old_val, new_val, test, no_w_mask;
const RegisterAccessInfo *ac;
assert(reg);
ac = reg->access;
if (!ac || !ac->name) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: write to undefined device state "
"(written value: %#" PRIx64 ")\n", prefix, val);
return;
}
old_val = reg->data ? register_read_val(reg) : ac->reset;
test = (old_val ^ val) & ac->rsvd;
if (test) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: change of value in reserved bit"
"fields: %#" PRIx64 ")\n", prefix, test);
}
test = val & ac->unimp;
if (test) {
qemu_log_mask(LOG_UNIMP,
"%s:%s writing %#" PRIx64 " to unimplemented bits:" \
" %#" PRIx64 "\n",
prefix, reg->access->name, val, ac->unimp);
}
/* Create the no write mask based on the read only, write to clear and
* reserved bit masks.
*/
no_w_mask = ac->ro | ac->w1c | ac->rsvd | ~we;
new_val = (val & ~no_w_mask) | (old_val & no_w_mask);
new_val &= ~(val & ac->w1c);
if (ac->pre_write) {
new_val = ac->pre_write(reg, new_val);
}
if (debug) {
qemu_log("%s:%s: write of value %#" PRIx64 "\n", prefix, ac->name,
new_val);
}
register_write_val(reg, new_val);
if (ac->post_write) {
ac->post_write(reg, new_val);
}
}
uint64_t register_read(RegisterInfo *reg, uint64_t re, const char* prefix,
bool debug)
{
uint64_t ret;
const RegisterAccessInfo *ac;
assert(reg);
ac = reg->access;
if (!ac || !ac->name) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: read from undefined device state\n",
prefix);
return 0;
}
ret = reg->data ? register_read_val(reg) : ac->reset;
register_write_val(reg, ret & ~(ac->cor & re));
/* Mask based on the read enable size */
ret &= re;
if (ac->post_read) {
ret = ac->post_read(reg, ret);
}
if (debug) {
qemu_log("%s:%s: read of value %#" PRIx64 "\n", prefix,
ac->name, ret);
}
return ret;
}
void register_reset(RegisterInfo *reg)
{
const RegisterAccessInfo *ac;
g_assert(reg);
if (!reg->data || !reg->access) {
return;
}
ac = reg->access;
register_write_val(reg, reg->access->reset);
if (ac->post_write) {
ac->post_write(reg, reg->access->reset);
}
}
void register_init(RegisterInfo *reg)
{
assert(reg);
if (!reg->data || !reg->access) {
return;
}
object_initialize((void *)reg, sizeof(*reg), TYPE_REGISTER);
}
void register_write_memory(void *opaque, hwaddr addr,
uint64_t value, unsigned size)
{
RegisterInfoArray *reg_array = opaque;
RegisterInfo *reg = NULL;
uint64_t we;
int i;
for (i = 0; i < reg_array->num_elements; i++) {
if (reg_array->r[i]->access->addr == addr) {
reg = reg_array->r[i];
break;
}
}
if (!reg) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: write to unimplemented register " \
"at address: %#" PRIx64 "\n", reg_array->prefix, addr);
return;
}
/* Generate appropriate write enable mask */
we = register_enabled_mask(reg->data_size, size);
register_write(reg, value, we, reg_array->prefix,
reg_array->debug);
}
uint64_t register_read_memory(void *opaque, hwaddr addr,
unsigned size)
{
RegisterInfoArray *reg_array = opaque;
RegisterInfo *reg = NULL;
uint64_t read_val;
uint64_t re;
int i;
for (i = 0; i < reg_array->num_elements; i++) {
if (reg_array->r[i]->access->addr == addr) {
reg = reg_array->r[i];
break;
}
}
if (!reg) {
qemu_log_mask(LOG_GUEST_ERROR, "%s: read to unimplemented register " \
"at address: %#" PRIx64 "\n", reg_array->prefix, addr);
return 0;
}
/* Generate appropriate read enable mask */
re = register_enabled_mask(reg->data_size, size);
read_val = register_read(reg, re, reg_array->prefix,
reg_array->debug);
return extract64(read_val, 0, size * 8);
}
RegisterInfoArray *register_init_block32(DeviceState *owner,
const RegisterAccessInfo *rae,
int num, RegisterInfo *ri,
uint32_t *data,
const MemoryRegionOps *ops,
bool debug_enabled,
uint64_t memory_size)
{
const char *device_prefix = object_get_typename(OBJECT(owner));
RegisterInfoArray *r_array = g_new0(RegisterInfoArray, 1);
int i;
r_array->r = g_new0(RegisterInfo *, num);
r_array->num_elements = num;
r_array->debug = debug_enabled;
r_array->prefix = device_prefix;
for (i = 0; i < num; i++) {
int index = rae[i].addr / 4;
RegisterInfo *r = &ri[index];
*r = (RegisterInfo) {
.data = &data[index],
.data_size = sizeof(uint32_t),
.access = &rae[i],
.opaque = owner,
};
register_init(r);
r_array->r[i] = r;
}
memory_region_init_io(&r_array->mem, OBJECT(owner), ops, r_array,
device_prefix, memory_size);
return r_array;
}
void register_finalize_block(RegisterInfoArray *r_array)
{
object_unparent(OBJECT(&r_array->mem));
g_free(r_array->r);
g_free(r_array);
}
static void register_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
/* Reason: needs to be wired up to work */
dc->user_creatable = false;
}
static const TypeInfo register_info = {
.name = TYPE_REGISTER,
.parent = TYPE_DEVICE,
.class_init = register_class_init,
};
static void register_register_types(void)
{
type_register_static(&register_info);
}
type_init(register_register_types)