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qemu/hw/spapr_rtas.c

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/*
* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
*
* Hypercall based emulated RTAS
*
* Copyright (c) 2010-2011 David Gibson, IBM Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
*/
#include "cpu.h"
#include "sysemu.h"
#include "qemu-char.h"
#include "hw/qdev.h"
#include "device_tree.h"
#include "hw/spapr.h"
#include "hw/spapr_vio.h"
#include <libfdt.h>
#define TOKEN_BASE 0x2000
#define TOKEN_MAX 0x100
static void rtas_display_character(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
uint8_t c = rtas_ld(args, 0);
VIOsPAPRDevice *sdev = spapr_vio_find_by_reg(spapr->vio_bus,
SPAPR_VTY_BASE_ADDRESS);
if (!sdev) {
rtas_st(rets, 0, -1);
} else {
vty_putchars(sdev, &c, sizeof(c));
rtas_st(rets, 0, 0);
}
}
static void rtas_get_time_of_day(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
struct tm tm;
if (nret != 8) {
rtas_st(rets, 0, -3);
return;
}
qemu_get_timedate(&tm, spapr->rtc_offset);
rtas_st(rets, 0, 0); /* Success */
rtas_st(rets, 1, tm.tm_year + 1900);
rtas_st(rets, 2, tm.tm_mon + 1);
rtas_st(rets, 3, tm.tm_mday);
rtas_st(rets, 4, tm.tm_hour);
rtas_st(rets, 5, tm.tm_min);
rtas_st(rets, 6, tm.tm_sec);
rtas_st(rets, 7, 0); /* we don't do nanoseconds */
}
static void rtas_set_time_of_day(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
struct tm tm;
tm.tm_year = rtas_ld(args, 0) - 1900;
tm.tm_mon = rtas_ld(args, 1) - 1;
tm.tm_mday = rtas_ld(args, 2);
tm.tm_hour = rtas_ld(args, 3);
tm.tm_min = rtas_ld(args, 4);
tm.tm_sec = rtas_ld(args, 5);
/* Just generate a monitor event for the change */
rtc_change_mon_event(&tm);
spapr->rtc_offset = qemu_timedate_diff(&tm);
rtas_st(rets, 0, 0); /* Success */
}
static void rtas_power_off(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
if (nargs != 2 || nret != 1) {
rtas_st(rets, 0, -3);
return;
}
qemu_system_shutdown_request();
rtas_st(rets, 0, 0);
}
static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong id;
CPUState *env;
if (nargs != 1 || nret != 2) {
rtas_st(rets, 0, -3);
return;
}
id = rtas_ld(args, 0);
for (env = first_cpu; env; env = env->next_cpu) {
if (env->cpu_index != id) {
continue;
}
if (env->halted) {
rtas_st(rets, 1, 0);
} else {
rtas_st(rets, 1, 2);
}
rtas_st(rets, 0, 0);
return;
}
/* Didn't find a matching cpu */
rtas_st(rets, 0, -3);
}
static void rtas_start_cpu(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
target_ulong id, start, r3;
CPUState *env;
if (nargs != 3 || nret != 1) {
rtas_st(rets, 0, -3);
return;
}
id = rtas_ld(args, 0);
start = rtas_ld(args, 1);
r3 = rtas_ld(args, 2);
for (env = first_cpu; env; env = env->next_cpu) {
if (env->cpu_index != id) {
continue;
}
if (!env->halted) {
rtas_st(rets, 0, -1);
return;
}
env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
env->nip = start;
env->gpr[3] = r3;
env->halted = 0;
qemu_cpu_kick(env);
rtas_st(rets, 0, 0);
return;
}
/* Didn't find a matching cpu */
rtas_st(rets, 0, -3);
}
static struct rtas_call {
const char *name;
spapr_rtas_fn fn;
} rtas_table[TOKEN_MAX];
struct rtas_call *rtas_next = rtas_table;
target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs, target_ulong args,
uint32_t nret, target_ulong rets)
{
if ((token >= TOKEN_BASE)
&& ((token - TOKEN_BASE) < TOKEN_MAX)) {
struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
if (call->fn) {
call->fn(spapr, token, nargs, args, nret, rets);
return H_SUCCESS;
}
}
/* HACK: Some Linux early debug code uses RTAS display-character,
* but assumes the token value is 0xa (which it is on some real
* machines) without looking it up in the device tree. This
* special case makes this work */
if (token == 0xa) {
rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
return H_SUCCESS;
}
hcall_dprintf("Unknown RTAS token 0x%x\n", token);
rtas_st(rets, 0, -3);
return H_PARAMETER;
}
void spapr_rtas_register(const char *name, spapr_rtas_fn fn)
{
assert(rtas_next < (rtas_table + TOKEN_MAX));
rtas_next->name = name;
rtas_next->fn = fn;
rtas_next++;
}
int spapr_rtas_device_tree_setup(void *fdt, target_phys_addr_t rtas_addr,
target_phys_addr_t rtas_size)
{
int ret;
int i;
ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
if (ret < 0) {
fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
rtas_addr);
if (ret < 0) {
fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
rtas_addr);
if (ret < 0) {
fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
fdt_strerror(ret));
return ret;
}
ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
rtas_size);
if (ret < 0) {
fprintf(stderr, "Couldn't add rtas-size property: %s\n",
fdt_strerror(ret));
return ret;
}
for (i = 0; i < TOKEN_MAX; i++) {
struct rtas_call *call = &rtas_table[i];
if (!call->fn) {
continue;
}
ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
i + TOKEN_BASE);
if (ret < 0) {
fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
call->name, fdt_strerror(ret));
return ret;
}
}
return 0;
}
static void register_core_rtas(void)
{
spapr_rtas_register("display-character", rtas_display_character);
spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
spapr_rtas_register("power-off", rtas_power_off);
spapr_rtas_register("query-cpu-stopped-state",
rtas_query_cpu_stopped_state);
spapr_rtas_register("start-cpu", rtas_start_cpu);
}
device_init(register_core_rtas);
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