[qemu.git] / hw / ppc / spapr_rtas.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/sysemu.h"
#include "sysemu/char.h"
#include "hw/qdev.h"
#include "sysemu/device_tree.h"

#include "hw/ppc/spapr.h"
#include "hw/ppc/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;
    CPUState *cpu;

    if (nargs != 1 || nret != 2) {
        rtas_st(rets, 0, -3);
        return;
    }

    id = rtas_ld(args, 0);
    cpu = qemu_get_cpu(id);
    if (cpu != NULL) {
        if (cpu->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 *cs;

    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);

    cs = qemu_get_cpu(id);
    if (cs != NULL) {
        PowerPCCPU *cpu = POWERPC_CPU(cs);
        CPUPPCState *env = &cpu->env;

        if (!cs->halted) {
            rtas_st(rets, 0, -1);
            return;
        }

        /* This will make sure qemu state is up to date with kvm, and
         * mark it dirty so our changes get flushed back before the
         * new cpu enters */
        kvm_cpu_synchronize_state(env);

        env->msr = (1ULL << MSR_SF) | (1ULL << MSR_ME);
        env->nip = start;
        env->gpr[3] = r3;
        cs->halted = 0;

        qemu_cpu_kick(cs);

        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;
}

int spapr_rtas_register(const char *name, spapr_rtas_fn fn)
{
    int i;

    for (i = 0; i < (rtas_next - rtas_table); i++) {
        if (strcmp(name, rtas_table[i].name) == 0) {
            fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
            exit(1);
        }
    }

    assert(rtas_next < (rtas_table + TOKEN_MAX));

    rtas_next->name = name;
    rtas_next->fn = fn;

    return (rtas_next++ - rtas_table) + TOKEN_BASE;
}

int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
                                 hwaddr 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->name) {
            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)
Commit	Line	Data
39ac8455 DG	1	/*
	2	* QEMU PowerPC pSeries Logical Partition (aka sPAPR) hardware System Emulator
	3	*
	4	* Hypercall based emulated RTAS
	5	*
	6	* Copyright (c) 2010-2011 David Gibson, IBM Corporation.
	7	*
	8	* Permission is hereby granted, free of charge, to any person obtaining a copy
	9	* of this software and associated documentation files (the "Software"), to deal
	10	* in the Software without restriction, including without limitation the rights
	11	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	12	* copies of the Software, and to permit persons to whom the Software is
	13	* furnished to do so, subject to the following conditions:
	14	*
	15	* The above copyright notice and this permission notice shall be included in
	16	* all copies or substantial portions of the Software.
	17	*
	18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	19	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	21	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	22	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	23	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	24	* THE SOFTWARE.
	25	*
	26	*/
	27	#include "cpu.h"
9c17d615	28	#include "sysemu/sysemu.h"
dccfcd0e	29	#include "sysemu/char.h"
39ac8455	30	#include "hw/qdev.h"
9c17d615	31	#include "sysemu/device_tree.h"
39ac8455	32
0d09e41a PB	33	#include "hw/ppc/spapr.h"
0d09e41a PB	34	#include "hw/ppc/spapr_vio.h"
39ac8455 DG	35
	36	#include <libfdt.h>
	37
	38	#define TOKEN_BASE 0x2000
	39	#define TOKEN_MAX 0x100
	40
821303f5 DG	41	static void rtas_display_character(sPAPREnvironment *spapr,
	42	uint32_t token, uint32_t nargs,
	43	target_ulong args,
	44	uint32_t nret, target_ulong rets)
	45	{
	46	uint8_t c = rtas_ld(args, 0);
5f2e2ba2	47	VIOsPAPRDevice *sdev = vty_lookup(spapr, 0);
821303f5 DG	48
	49	if (!sdev) {
	50	rtas_st(rets, 0, -1);
	51	} else {
	52	vty_putchars(sdev, &c, sizeof(c));
	53	rtas_st(rets, 0, 0);
	54	}
	55	}
	56
	57	static void rtas_get_time_of_day(sPAPREnvironment *spapr,
	58	uint32_t token, uint32_t nargs,
	59	target_ulong args,
	60	uint32_t nret, target_ulong rets)
	61	{
	62	struct tm tm;
	63
	64	if (nret != 8) {
	65	rtas_st(rets, 0, -3);
	66	return;
	67	}
	68
ac26f8c3	69	qemu_get_timedate(&tm, spapr->rtc_offset);
821303f5 DG	70
	71	rtas_st(rets, 0, 0); /* Success */
	72	rtas_st(rets, 1, tm.tm_year + 1900);
	73	rtas_st(rets, 2, tm.tm_mon + 1);
	74	rtas_st(rets, 3, tm.tm_mday);
	75	rtas_st(rets, 4, tm.tm_hour);
	76	rtas_st(rets, 5, tm.tm_min);
	77	rtas_st(rets, 6, tm.tm_sec);
	78	rtas_st(rets, 7, 0); /* we don't do nanoseconds */
	79	}
	80
ac26f8c3 BL	81	static void rtas_set_time_of_day(sPAPREnvironment *spapr,
	82	uint32_t token, uint32_t nargs,
	83	target_ulong args,
	84	uint32_t nret, target_ulong rets)
	85	{
	86	struct tm tm;
	87
	88	tm.tm_year = rtas_ld(args, 0) - 1900;
	89	tm.tm_mon = rtas_ld(args, 1) - 1;
	90	tm.tm_mday = rtas_ld(args, 2);
	91	tm.tm_hour = rtas_ld(args, 3);
	92	tm.tm_min = rtas_ld(args, 4);
	93	tm.tm_sec = rtas_ld(args, 5);
	94
	95	/* Just generate a monitor event for the change */
	96	rtc_change_mon_event(&tm);
	97	spapr->rtc_offset = qemu_timedate_diff(&tm);
	98
	99	rtas_st(rets, 0, 0); /* Success */
	100	}
	101
821303f5 DG	102	static void rtas_power_off(sPAPREnvironment *spapr,
	103	uint32_t token, uint32_t nargs, target_ulong args,
	104	uint32_t nret, target_ulong rets)
	105	{
	106	if (nargs != 2 \|\| nret != 1) {
	107	rtas_st(rets, 0, -3);
	108	return;
	109	}
	110	qemu_system_shutdown_request();
	111	rtas_st(rets, 0, 0);
	112	}
	113
c821a43c DG	114	static void rtas_system_reboot(sPAPREnvironment *spapr,
	115	uint32_t token, uint32_t nargs,
	116	target_ulong args,
	117	uint32_t nret, target_ulong rets)
	118	{
	119	if (nargs != 0 \|\| nret != 1) {
	120	rtas_st(rets, 0, -3);
	121	return;
	122	}
	123	qemu_system_reset_request();
	124	rtas_st(rets, 0, 0);
	125	}
	126
a9f8ad8f DG	127	static void rtas_query_cpu_stopped_state(sPAPREnvironment *spapr,
	128	uint32_t token, uint32_t nargs,
	129	target_ulong args,
	130	uint32_t nret, target_ulong rets)
	131	{
	132	target_ulong id;
55e5c285	133	CPUState *cpu;
a9f8ad8f DG	134
	135	if (nargs != 1 \|\| nret != 2) {
	136	rtas_st(rets, 0, -3);
	137	return;
	138	}
	139
	140	id = rtas_ld(args, 0);
05318a85 AF	141	cpu = qemu_get_cpu(id);
05318a85 AF	142	if (cpu != NULL) {
259186a7	143	if (cpu->halted) {
a9f8ad8f DG	144	rtas_st(rets, 1, 0);
	145	} else {
	146	rtas_st(rets, 1, 2);
	147	}
	148
	149	rtas_st(rets, 0, 0);
	150	return;
	151	}
	152
	153	/* Didn't find a matching cpu */
	154	rtas_st(rets, 0, -3);
	155	}
	156
	157	static void rtas_start_cpu(sPAPREnvironment *spapr,
	158	uint32_t token, uint32_t nargs,
	159	target_ulong args,
	160	uint32_t nret, target_ulong rets)
	161	{
	162	target_ulong id, start, r3;
c67e216b	163	CPUState *cs;
a9f8ad8f DG	164
	165	if (nargs != 3 \|\| nret != 1) {
	166	rtas_st(rets, 0, -3);
	167	return;
	168	}
	169
	170	id = rtas_ld(args, 0);
	171	start = rtas_ld(args, 1);
	172	r3 = rtas_ld(args, 2);
	173
c67e216b AF	174	cs = qemu_get_cpu(id);
	175	if (cs != NULL) {
	176	PowerPCCPU *cpu = POWERPC_CPU(cs);
	177	CPUPPCState *env = &cpu->env;
a9f8ad8f	178
c67e216b	179	if (!cs->halted) {
a9f8ad8f DG	180	rtas_st(rets, 0, -1);
	181	return;
	182	}
	183
048706d9 DG	184	/* This will make sure qemu state is up to date with kvm, and
	185	* mark it dirty so our changes get flushed back before the
	186	* new cpu enters */
	187	kvm_cpu_synchronize_state(env);
	188
a9f8ad8f DG	189	env->msr = (1ULL << MSR_SF) \| (1ULL << MSR_ME);
	190	env->nip = start;
	191	env->gpr[3] = r3;
c67e216b	192	cs->halted = 0;
a9f8ad8f	193
c67e216b	194	qemu_cpu_kick(cs);
a9f8ad8f DG	195
	196	rtas_st(rets, 0, 0);
	197	return;
	198	}
	199
	200	/* Didn't find a matching cpu */
	201	rtas_st(rets, 0, -3);
	202	}
	203
39ac8455 DG	204	static struct rtas_call {
	205	const char *name;
	206	spapr_rtas_fn fn;
	207	} rtas_table[TOKEN_MAX];
	208
	209	struct rtas_call *rtas_next = rtas_table;
	210
	211	target_ulong spapr_rtas_call(sPAPREnvironment *spapr,
	212	uint32_t token, uint32_t nargs, target_ulong args,
	213	uint32_t nret, target_ulong rets)
	214	{
	215	if ((token >= TOKEN_BASE)
	216	&& ((token - TOKEN_BASE) < TOKEN_MAX)) {
	217	struct rtas_call *call = rtas_table + (token - TOKEN_BASE);
	218
	219	if (call->fn) {
	220	call->fn(spapr, token, nargs, args, nret, rets);
	221	return H_SUCCESS;
	222	}
	223	}
	224
821303f5 DG	225	/* HACK: Some Linux early debug code uses RTAS display-character,
	226	* but assumes the token value is 0xa (which it is on some real
	227	* machines) without looking it up in the device tree. This
	228	* special case makes this work */
	229	if (token == 0xa) {
	230	rtas_display_character(spapr, 0xa, nargs, args, nret, rets);
	231	return H_SUCCESS;
	232	}
	233
39ac8455 DG	234	hcall_dprintf("Unknown RTAS token 0x%x\n", token);
	235	rtas_st(rets, 0, -3);
	236	return H_PARAMETER;
	237	}
	238
4aac82c3	239	int spapr_rtas_register(const char *name, spapr_rtas_fn fn)
39ac8455	240	{
c89d5299 DG	241	int i;
	242
	243	for (i = 0; i < (rtas_next - rtas_table); i++) {
	244	if (strcmp(name, rtas_table[i].name) == 0) {
	245	fprintf(stderr, "RTAS call \"%s\" registered twice\n", name);
	246	exit(1);
	247	}
	248	}
	249
39ac8455 DG	250	assert(rtas_next < (rtas_table + TOKEN_MAX));
	251
	252	rtas_next->name = name;
	253	rtas_next->fn = fn;
	254
4aac82c3	255	return (rtas_next++ - rtas_table) + TOKEN_BASE;
39ac8455 DG	256	}
39ac8455 DG	257
a8170e5e AK	258	int spapr_rtas_device_tree_setup(void *fdt, hwaddr rtas_addr,
a8170e5e AK	259	hwaddr rtas_size)
39ac8455 DG	260	{
	261	int ret;
	262	int i;
	263
	264	ret = fdt_add_mem_rsv(fdt, rtas_addr, rtas_size);
	265	if (ret < 0) {
	266	fprintf(stderr, "Couldn't add RTAS reserve entry: %s\n",
	267	fdt_strerror(ret));
	268	return ret;
	269	}
	270
	271	ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-base",
	272	rtas_addr);
	273	if (ret < 0) {
	274	fprintf(stderr, "Couldn't add linux,rtas-base property: %s\n",
	275	fdt_strerror(ret));
	276	return ret;
	277	}
	278
	279	ret = qemu_devtree_setprop_cell(fdt, "/rtas", "linux,rtas-entry",
	280	rtas_addr);
	281	if (ret < 0) {
	282	fprintf(stderr, "Couldn't add linux,rtas-entry property: %s\n",
	283	fdt_strerror(ret));
	284	return ret;
	285	}
	286
	287	ret = qemu_devtree_setprop_cell(fdt, "/rtas", "rtas-size",
	288	rtas_size);
	289	if (ret < 0) {
	290	fprintf(stderr, "Couldn't add rtas-size property: %s\n",
	291	fdt_strerror(ret));
	292	return ret;
	293	}
	294
	295	for (i = 0; i < TOKEN_MAX; i++) {
	296	struct rtas_call *call = &rtas_table[i];
	297
d36b66f7	298	if (!call->name) {
39ac8455 DG	299	continue;
	300	}
	301
	302	ret = qemu_devtree_setprop_cell(fdt, "/rtas", call->name,
	303	i + TOKEN_BASE);
	304	if (ret < 0) {
	305	fprintf(stderr, "Couldn't add rtas token for %s: %s\n",
	306	call->name, fdt_strerror(ret));
	307	return ret;
	308	}
	309
	310	}
	311	return 0;
	312	}
821303f5	313
83f7d43a	314	static void core_rtas_register_types(void)
821303f5 DG	315	{
	316	spapr_rtas_register("display-character", rtas_display_character);
	317	spapr_rtas_register("get-time-of-day", rtas_get_time_of_day);
ac26f8c3	318	spapr_rtas_register("set-time-of-day", rtas_set_time_of_day);
821303f5	319	spapr_rtas_register("power-off", rtas_power_off);
c821a43c	320	spapr_rtas_register("system-reboot", rtas_system_reboot);
a9f8ad8f DG	321	spapr_rtas_register("query-cpu-stopped-state",
	322	rtas_query_cpu_stopped_state);
	323	spapr_rtas_register("start-cpu", rtas_start_cpu);
821303f5	324	}
83f7d43a AF	325
83f7d43a AF	326	type_init(core_rtas_register_types)