Archipelago » qemu

/*

 *  S/390 misc helper routines

 *

 *  Copyright (c) 2009 Ulrich Hecht

 *  Copyright (c) 2009 Alexander Graf

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

#include "cpu.h"

#include "memory.h"

#include "cputlb.h"

#include "host-utils.h"

#include "helper.h"

#include <string.h>

#include "kvm.h"

#include "qemu-timer.h"

#ifdef CONFIG_KVM

#include <linux/kvm.h>

#endif

#if !defined(CONFIG_USER_ONLY)

#include "softmmu_exec.h"

#include "sysemu.h"

#endif

/* #define DEBUG_HELPER */

#ifdef DEBUG_HELPER

#define HELPER_LOG(x...) qemu_log(x)

#else

#define HELPER_LOG(x...)

#endif

/* raise an exception */

void HELPER(exception)(CPUS390XState *env, uint32_t excp)

{

    HELPER_LOG("%s: exception %d\n", __func__, excp);

    env->exception_index = excp;

    cpu_loop_exit(env);

}

#ifndef CONFIG_USER_ONLY

void program_interrupt(CPUS390XState *env, uint32_t code, int ilc)

{

    qemu_log("program interrupt at %#" PRIx64 "\n", env->psw.addr);

    if (kvm_enabled()) {

#ifdef CONFIG_KVM

        kvm_s390_interrupt(env, KVM_S390_PROGRAM_INT, code);

#endif

    } else {

        env->int_pgm_code = code;

        env->int_pgm_ilc = ilc;

        env->exception_index = EXCP_PGM;

        cpu_loop_exit(env);

    }

}

/*

 * ret < 0 indicates program check, ret = 0, 1, 2, 3 -> cc

 */

int sclp_service_call(CPUS390XState *env, uint32_t sccb, uint64_t code)

{

    int r = 0;

    int shift = 0;

#ifdef DEBUG_HELPER

    printf("sclp(0x%x, 0x%" PRIx64 ")\n", sccb, code);

#endif

    /* basic checks */

    if (!memory_region_is_ram(phys_page_find(sccb >> TARGET_PAGE_BITS)->mr)) {

        return -PGM_ADDRESSING;

    }

    if (sccb & ~0x7ffffff8ul) {

        return -PGM_SPECIFICATION;

    }

    switch (code) {

    case SCLP_CMDW_READ_SCP_INFO:

    case SCLP_CMDW_READ_SCP_INFO_FORCED:

        while ((ram_size >> (20 + shift)) > 65535) {

            shift++;

        }

        stw_phys(sccb + SCP_MEM_CODE, ram_size >> (20 + shift));

        stb_phys(sccb + SCP_INCREMENT, 1 << shift);

        stw_phys(sccb + SCP_RESPONSE_CODE, 0x10);

        s390_sclp_extint(sccb & ~3);

        break;

    default:

#ifdef DEBUG_HELPER

        printf("KVM: invalid sclp call 0x%x / 0x%" PRIx64 "x\n", sccb, code);

#endif

        r = 3;

        break;

    }

    return r;

}

/* SCLP service call */

uint32_t HELPER(servc)(CPUS390XState *env, uint32_t r1, uint64_t r2)

{

    int r;

    r = sclp_service_call(env, r1, r2);

    if (r < 0) {

        program_interrupt(env, -r, 4);

        return 0;

    }

    return r;

}

/* DIAG */

uint64_t HELPER(diag)(CPUS390XState *env, uint32_t num, uint64_t mem,

                      uint64_t code)

{

    uint64_t r;

    switch (num) {

    case 0x500:

        /* KVM hypercall */

        r = s390_virtio_hypercall(env, mem, code);

        break;

    case 0x44:

        /* yield */

        r = 0;

        break;

    case 0x308:

        /* ipl */

        r = 0;

        break;

    default:

        r = -1;

        break;

    }

    if (r) {

        program_interrupt(env, PGM_OPERATION, ILC_LATER_INC);

    }

    return r;

}

/* Store CPU ID */

void HELPER(stidp)(CPUS390XState *env, uint64_t a1)

{

    cpu_stq_data(env, a1, env->cpu_num);

}

/* Set Prefix */

void HELPER(spx)(CPUS390XState *env, uint64_t a1)

{

    uint32_t prefix;

    prefix = cpu_ldl_data(env, a1);

    env->psa = prefix & 0xfffff000;

    qemu_log("prefix: %#x\n", prefix);

    tlb_flush_page(env, 0);

    tlb_flush_page(env, TARGET_PAGE_SIZE);

}

/* Set Clock */

uint32_t HELPER(sck)(uint64_t a1)

{

    /* XXX not implemented - is it necessary? */

    return 0;

}

static inline uint64_t clock_value(CPUS390XState *env)

{

    uint64_t time;

    time = env->tod_offset +

        time2tod(qemu_get_clock_ns(vm_clock) - env->tod_basetime);

    return time;

}

/* Store Clock */

uint32_t HELPER(stck)(CPUS390XState *env, uint64_t a1)

{

    cpu_stq_data(env, a1, clock_value(env));

    return 0;

}

/* Store Clock Extended */

uint32_t HELPER(stcke)(CPUS390XState *env, uint64_t a1)

{

    cpu_stb_data(env, a1, 0);

    /* basically the same value as stck */

    cpu_stq_data(env, a1 + 1, clock_value(env) | env->cpu_num);

    /* more fine grained than stck */

    cpu_stq_data(env, a1 + 9, 0);

    /* XXX programmable fields */

    cpu_stw_data(env, a1 + 17, 0);

    return 0;

}

/* Set Clock Comparator */

void HELPER(sckc)(CPUS390XState *env, uint64_t a1)

{

    uint64_t time = cpu_ldq_data(env, a1);

    if (time == -1ULL) {

        return;

    }

    /* difference between now and then */

    time -= clock_value(env);

    /* nanoseconds */

    time = (time * 125) >> 9;

    qemu_mod_timer(env->tod_timer, qemu_get_clock_ns(vm_clock) + time);

}

/* Store Clock Comparator */

void HELPER(stckc)(CPUS390XState *env, uint64_t a1)

{

    /* XXX implement */

    cpu_stq_data(env, a1, 0);

}

/* Set CPU Timer */

void HELPER(spt)(CPUS390XState *env, uint64_t a1)

{

    uint64_t time = cpu_ldq_data(env, a1);

    if (time == -1ULL) {

        return;

    }

    /* nanoseconds */

    time = (time * 125) >> 9;

    qemu_mod_timer(env->cpu_timer, qemu_get_clock_ns(vm_clock) + time);

}

/* Store CPU Timer */

void HELPER(stpt)(CPUS390XState *env, uint64_t a1)

{

    /* XXX implement */

    cpu_stq_data(env, a1, 0);

}

/* Store System Information */

uint32_t HELPER(stsi)(CPUS390XState *env, uint64_t a0, uint32_t r0,

                      uint32_t r1)

{

    int cc = 0;

    int sel1, sel2;

    if ((r0 & STSI_LEVEL_MASK) <= STSI_LEVEL_3 &&

        ((r0 & STSI_R0_RESERVED_MASK) || (r1 & STSI_R1_RESERVED_MASK))) {

        /* valid function code, invalid reserved bits */

        program_interrupt(env, PGM_SPECIFICATION, 2);

    }

    sel1 = r0 & STSI_R0_SEL1_MASK;

    sel2 = r1 & STSI_R1_SEL2_MASK;

    /* XXX: spec exception if sysib is not 4k-aligned */

    switch (r0 & STSI_LEVEL_MASK) {

    case STSI_LEVEL_1:

        if ((sel1 == 1) && (sel2 == 1)) {

            /* Basic Machine Configuration */

            struct sysib_111 sysib;

            memset(&sysib, 0, sizeof(sysib));

            ebcdic_put(sysib.manuf, "QEMU            ", 16);

            /* same as machine type number in STORE CPU ID */

            ebcdic_put(sysib.type, "QEMU", 4);

            /* same as model number in STORE CPU ID */

            ebcdic_put(sysib.model, "QEMU            ", 16);

            ebcdic_put(sysib.sequence, "QEMU            ", 16);

            ebcdic_put(sysib.plant, "QEMU", 4);

            cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

        } else if ((sel1 == 2) && (sel2 == 1)) {

            /* Basic Machine CPU */

            struct sysib_121 sysib;

            memset(&sysib, 0, sizeof(sysib));

            /* XXX make different for different CPUs? */

            ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);

            ebcdic_put(sysib.plant, "QEMU", 4);

            stw_p(&sysib.cpu_addr, env->cpu_num);

            cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

        } else if ((sel1 == 2) && (sel2 == 2)) {

            /* Basic Machine CPUs */

            struct sysib_122 sysib;

            memset(&sysib, 0, sizeof(sysib));

            stl_p(&sysib.capability, 0x443afc29);

            /* XXX change when SMP comes */

            stw_p(&sysib.total_cpus, 1);

            stw_p(&sysib.active_cpus, 1);

            stw_p(&sysib.standby_cpus, 0);

            stw_p(&sysib.reserved_cpus, 0);

            cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

        } else {

            cc = 3;

        }

        break;

    case STSI_LEVEL_2:

        {

            if ((sel1 == 2) && (sel2 == 1)) {

                /* LPAR CPU */

                struct sysib_221 sysib;

                memset(&sysib, 0, sizeof(sysib));

                /* XXX make different for different CPUs? */

                ebcdic_put(sysib.sequence, "QEMUQEMUQEMUQEMU", 16);

                ebcdic_put(sysib.plant, "QEMU", 4);

                stw_p(&sysib.cpu_addr, env->cpu_num);

                stw_p(&sysib.cpu_id, 0);

                cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

            } else if ((sel1 == 2) && (sel2 == 2)) {

                /* LPAR CPUs */

                struct sysib_222 sysib;

                memset(&sysib, 0, sizeof(sysib));

                stw_p(&sysib.lpar_num, 0);

                sysib.lcpuc = 0;

                /* XXX change when SMP comes */

                stw_p(&sysib.total_cpus, 1);

                stw_p(&sysib.conf_cpus, 1);

                stw_p(&sysib.standby_cpus, 0);

                stw_p(&sysib.reserved_cpus, 0);

                ebcdic_put(sysib.name, "QEMU    ", 8);

                stl_p(&sysib.caf, 1000);

                stw_p(&sysib.dedicated_cpus, 0);

                stw_p(&sysib.shared_cpus, 0);

                cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

            } else {

                cc = 3;

            }

            break;

        }

    case STSI_LEVEL_3:

        {

            if ((sel1 == 2) && (sel2 == 2)) {

                /* VM CPUs */

                struct sysib_322 sysib;

                memset(&sysib, 0, sizeof(sysib));

                sysib.count = 1;

                /* XXX change when SMP comes */

                stw_p(&sysib.vm[0].total_cpus, 1);

                stw_p(&sysib.vm[0].conf_cpus, 1);

                stw_p(&sysib.vm[0].standby_cpus, 0);

                stw_p(&sysib.vm[0].reserved_cpus, 0);

                ebcdic_put(sysib.vm[0].name, "KVMguest", 8);

                stl_p(&sysib.vm[0].caf, 1000);

                ebcdic_put(sysib.vm[0].cpi, "KVM/Linux       ", 16);

                cpu_physical_memory_rw(a0, (uint8_t *)&sysib, sizeof(sysib), 1);

            } else {

                cc = 3;

            }

            break;

        }

    case STSI_LEVEL_CURRENT:

        env->regs[0] = STSI_LEVEL_3;

        break;

    default:

        cc = 3;

        break;

    }

    return cc;

}

uint32_t HELPER(sigp)(CPUS390XState *env, uint64_t order_code, uint32_t r1,

                      uint64_t cpu_addr)

{

    int cc = 0;

    HELPER_LOG("%s: %016" PRIx64 " %08x %016" PRIx64 "\n",

               __func__, order_code, r1, cpu_addr);

    /* Remember: Use "R1 or R1 + 1, whichever is the odd-numbered register"

       as parameter (input). Status (output) is always R1. */

    switch (order_code) {

    case SIGP_SET_ARCH:

        /* switch arch */

        break;

    case SIGP_SENSE:

        /* enumerate CPU status */

        if (cpu_addr) {

            /* XXX implement when SMP comes */

            return 3;

        }

        env->regs[r1] &= 0xffffffff00000000ULL;

        cc = 1;

        break;

#if !defined(CONFIG_USER_ONLY)

    case SIGP_RESTART:

        qemu_system_reset_request();

        cpu_loop_exit(env);

        break;

    case SIGP_STOP:

        qemu_system_shutdown_request();

        cpu_loop_exit(env);

        break;

#endif

    default:

        /* unknown sigp */

        fprintf(stderr, "XXX unknown sigp: 0x%" PRIx64 "\n", order_code);

        cc = 3;

    }

    return cc;

}

#endif