qemu/hw/spapr_rtas.c
David Gibson 5f2e2ba262 pseries: Consolidate hack for RTAS display-character usage
Currently the pseries machine contains not one but two somewhat ugly hacks
to allow printing of early debug messages before the guest has properly
read the device tree.

First, we special case H_PUT_TERM_CHAR so that a vtermno of 0 (usually
invalid) will look for a suitable vty and use that.  This supports Linux's
early debug code which will use H_PUT_TERM_CHAR with vtermno==0 before
reading the device tree.  Second, we support the RTAS display-character call.
This takes no vtermno so we assume the address of the default first VTY.

This patch makes things more consistent by folding the second hack into the
first.  Now, display-character uses the existing vty_lookup() function to
do the same search for a suitable VTY.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andreas Färber <afaerber@suse.de>
2012-04-15 17:07:19 +02:00

316 lines
9.1 KiB
C

/*
* 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 = vty_lookup(spapr, 0);
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_system_reboot(sPAPREnvironment *spapr,
uint32_t token, uint32_t nargs,
target_ulong args,
uint32_t nret, target_ulong rets)
{
if (nargs != 0 || nret != 1) {
rtas_st(rets, 0, -3);
return;
}
qemu_system_reset_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;
CPUPPCState *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;
CPUPPCState *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 core_rtas_register_types(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("system-reboot", rtas_system_reboot);
spapr_rtas_register("query-cpu-stopped-state",
rtas_query_cpu_stopped_state);
spapr_rtas_register("start-cpu", rtas_start_cpu);
}
type_init(core_rtas_register_types)