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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/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(PowerPCCPU *cpu, 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, RTAS_OUT_HW_ERROR);

    } else {

        vty_putchars(sdev, &c, sizeof(c));

        rtas_st(rets, 0, RTAS_OUT_SUCCESS);

    }

}

static void rtas_get_time_of_day(PowerPCCPU *cpu, 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, RTAS_OUT_PARAM_ERROR);

        return;

    }

    qemu_get_timedate(&tm, spapr->rtc_offset);

    rtas_st(rets, 0, RTAS_OUT_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(PowerPCCPU *cpu, 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, RTAS_OUT_SUCCESS);

}

static void rtas_power_off(PowerPCCPU *cpu, 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, RTAS_OUT_PARAM_ERROR);

        return;

    }

    qemu_system_shutdown_request();

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);

}

static void rtas_system_reboot(PowerPCCPU *cpu, 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, RTAS_OUT_PARAM_ERROR);

        return;

    }

    qemu_system_reset_request();

    rtas_st(rets, 0, RTAS_OUT_SUCCESS);

}

static void rtas_query_cpu_stopped_state(PowerPCCPU *cpu_,

                                         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, RTAS_OUT_PARAM_ERROR);

        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, RTAS_OUT_SUCCESS);

        return;

    }

    /* Didn't find a matching cpu */

    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

}

static void rtas_start_cpu(PowerPCCPU *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, RTAS_OUT_PARAM_ERROR);

        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, RTAS_OUT_HW_ERROR);

            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(cs);

        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, RTAS_OUT_SUCCESS);

        return;

    }

    /* Didn't find a matching cpu */

    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

}

static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                           uint32_t token, uint32_t nargs,

                           target_ulong args,

                           uint32_t nret, target_ulong rets)

{

    CPUState *cs = CPU(cpu);

    CPUPPCState *env = &cpu->env;

    cs->halted = 1;

    cpu_exit(cs);

    /*

     * While stopping a CPU, the guest calls H_CPPR which

     * effectively disables interrupts on XICS level.

     * However decrementer interrupts in TCG can still

     * wake the CPU up so here we disable interrupts in MSR

     * as well.

     * As rtas_start_cpu() resets the whole MSR anyway, there is

     * no need to bother with specific bits, we just clear it.

     */

    env->msr = 0;

}

#define DIAGNOSTICS_RUN_MODE        42

static void rtas_ibm_get_system_parameter(PowerPCCPU *cpu,

                                          sPAPREnvironment *spapr,

                                          uint32_t token, uint32_t nargs,

                                          target_ulong args,

                                          uint32_t nret, target_ulong rets)

{

    target_ulong parameter = rtas_ld(args, 0);

    target_ulong buffer = rtas_ld(args, 1);

    target_ulong length = rtas_ld(args, 2);

    target_ulong ret = RTAS_OUT_NOT_SUPPORTED;

    switch (parameter) {

    case DIAGNOSTICS_RUN_MODE:

        if (length == 1) {

            rtas_st(buffer, 0, 0);

            ret = RTAS_OUT_SUCCESS;

        }

        break;

    }

    rtas_st(rets, 0, ret);

}

static void rtas_ibm_set_system_parameter(PowerPCCPU *cpu,

                                          sPAPREnvironment *spapr,

                                          uint32_t token, uint32_t nargs,

                                          target_ulong args,

                                          uint32_t nret, target_ulong rets)

{

    target_ulong parameter = rtas_ld(args, 0);

    target_ulong ret = RTAS_OUT_NOT_SUPPORTED;

    switch (parameter) {

    case DIAGNOSTICS_RUN_MODE:

        ret = RTAS_OUT_NOT_AUTHORIZED;

        break;

    }

    rtas_st(rets, 0, ret);

}

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(PowerPCCPU *cpu, 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(cpu, 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(cpu, spapr, 0xa, nargs, args, nret, rets);

        return H_SUCCESS;

    }

    hcall_dprintf("Unknown RTAS token 0x%x\n", token);

    rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

    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_fdt_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_fdt_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_fdt_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_fdt_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);

    spapr_rtas_register("stop-self", rtas_stop_self);

    spapr_rtas_register("ibm,get-system-parameter",

                        rtas_ibm_get_system_parameter);

    spapr_rtas_register("ibm,set-system-parameter",

                        rtas_ibm_set_system_parameter);

}

type_init(core_rtas_register_types)