Archipelago » qemu

/*

 *  MIPS emulation for qemu: CPU initialisation routines.

 *

 *  Copyright (c) 2004-2005 Jocelyn Mayer

 *  Copyright (c) 2007 Herve Poussineau

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 */

/* CPU / CPU family specific config register values. */

/* Have config1, is MIPS32R1, uses TLB, no virtual icache,

   uncached coherency */

#define MIPS_CONFIG0                                              \

  ((1 << CP0C0_M) | (0x0 << CP0C0_K23) | (0x0 << CP0C0_KU) |      \

   (0x0 << CP0C0_AT) | (0x0 << CP0C0_AR) | (0x1 << CP0C0_MT) |    \

   (0x2 << CP0C0_K0))

/* Have config2, no coprocessor2 attached, no MDMX support attached,

   no performance counters, watch registers present,

   no code compression, EJTAG present, no FPU */

#define MIPS_CONFIG1                                              \

((1 << CP0C1_M) |                                                 \

 (0 << CP0C1_C2) | (0 << CP0C1_MD) | (0 << CP0C1_PC) |            \

 (1 << CP0C1_WR) | (0 << CP0C1_CA) | (1 << CP0C1_EP) |            \

 (0 << CP0C1_FP))

/* Have config3, no tertiary/secondary caches implemented */

#define MIPS_CONFIG2                                              \

((1 << CP0C2_M))

/* No config4, no DSP ASE, no large physaddr,

   no external interrupt controller, no vectored interupts,

   no 1kb pages, no MT ASE, no SmartMIPS ASE, no trace logic */

#define MIPS_CONFIG3                                              \

((0 << CP0C3_M) | (0 << CP0C3_DSPP) | (0 << CP0C3_LPA) |          \

 (0 << CP0C3_VEIC) | (0 << CP0C3_VInt) | (0 << CP0C3_SP) |        \

 (0 << CP0C3_MT) | (0 << CP0C3_SM) | (0 << CP0C3_TL))

/* Define a implementation number of 1.

   Define a major version 1, minor version 0. */

#define MIPS_FCR0 ((0 << FCR0_S) | (0x1 << FCR0_PRID) | (0x10 << FCR0_REV))

struct mips_def_t {

    const unsigned char *name;

    int32_t CP0_PRid;

    int32_t CP0_Config0;

    int32_t CP0_Config1;

    int32_t CP0_Config2;

    int32_t CP0_Config3;

    int32_t CP0_Config6;

    int32_t CP0_Config7;

    int32_t SYNCI_Step;

    int32_t CCRes;

    int32_t Status_rw_bitmask;

    int32_t CP1_fcr0;

    int32_t SEGBITS;

};

/*****************************************************************************/

/* MIPS CPU definitions */

static mips_def_t mips_defs[] =

{

    {

        .name = "4Kc",

        .CP0_PRid = 0x00018000,

        .CP0_Config0 = MIPS_CONFIG0,

        .CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3278FF17,

        .SEGBITS = 32,

    },

    {

        .name = "4KEcR1",

        .CP0_PRid = 0x00018400,

        .CP0_Config0 = MIPS_CONFIG0,

        .CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3278FF17,

        .SEGBITS = 32,

    },

    {

        .name = "4KEc",

        .CP0_PRid = 0x00019000,

        .CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),

        .CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3278FF17,

        .SEGBITS = 32,

    },

    {

        .name = "24Kc",

        .CP0_PRid = 0x00019300,

        .CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),

        .CP0_Config1 = MIPS_CONFIG1 | (15 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3278FF17,

        .SEGBITS = 32,

    },

    {

        .name = "24Kf",

        .CP0_PRid = 0x00019300,

        .CP0_Config0 = MIPS_CONFIG0 | (0x1 << CP0C0_AR),

        .CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (15 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3678FF17,

        .CP1_fcr0 = (1 << FCR0_F64) | (1 << FCR0_L) | (1 << FCR0_W) |

                    (1 << FCR0_D) | (1 << FCR0_S) | (0x93 << FCR0_PRID),

        .SEGBITS = 32,

    },

#ifdef TARGET_MIPS64

    {

        .name = "R4000",

        .CP0_PRid = 0x00000400,

        .CP0_Config0 = MIPS_CONFIG0 | (0x2 << CP0C0_AT),

        .CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (47 << CP0C1_MMU) |

                    (0 << CP0C1_IS) | (3 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (0 << CP0C1_DS) | (3 << CP0C1_DL) | (1 << CP0C1_DA),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 16,

        .CCRes = 2,

        .Status_rw_bitmask = 0x3678FFFF,

        /* The R4000 has a full 64bit FPU doesn't use the fcr0 bits. */

        .CP1_fcr0 = (0x5 << FCR0_PRID) | (0x0 << FCR0_REV),

        .SEGBITS = 40,

    },

    {

        .name = "5Kc",

        .CP0_PRid = 0x00018100,

        .CP0_Config0 = MIPS_CONFIG0 | (0x2 << CP0C0_AT),

        .CP0_Config1 = MIPS_CONFIG1 | (31 << CP0C1_MMU) |

                    (1 << CP0C1_IS) | (4 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (1 << CP0C1_DS) | (4 << CP0C1_DL) | (1 << CP0C1_DA) |

                    (1 << CP0C1_PC) | (1 << CP0C1_WR) | (1 << CP0C1_EP),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x32F8FFFF,

        .SEGBITS = 42,

    },

    {

        .name = "5Kf",

        .CP0_PRid = 0x00018100,

        .CP0_Config0 = MIPS_CONFIG0 | (0x2 << CP0C0_AT),

        .CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (31 << CP0C1_MMU) |

                    (1 << CP0C1_IS) | (4 << CP0C1_IL) | (1 << CP0C1_IA) |

                    (1 << CP0C1_DS) | (4 << CP0C1_DL) | (1 << CP0C1_DA) |

                    (1 << CP0C1_PC) | (1 << CP0C1_WR) | (1 << CP0C1_EP),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x36F8FFFF,

        /* The 5Kf has F64 / L / W but doesn't use the fcr0 bits. */

        .CP1_fcr0 = (1 << FCR0_D) | (1 << FCR0_S) |

                    (0x81 << FCR0_PRID) | (0x0 << FCR0_REV),

        .SEGBITS = 42,

    },

    {

        .name = "20Kc",

        /* We emulate a later version of the 20Kc, earlier ones had a broken

           WAIT instruction. */

        .CP0_PRid = 0x000182a0,

        .CP0_Config0 = MIPS_CONFIG0 | (0x2 << CP0C0_AT) | (1 << CP0C0_VI),

        .CP0_Config1 = MIPS_CONFIG1 | (1 << CP0C1_FP) | (47 << CP0C1_MMU) |

                    (2 << CP0C1_IS) | (4 << CP0C1_IL) | (3 << CP0C1_IA) |

                    (2 << CP0C1_DS) | (4 << CP0C1_DL) | (3 << CP0C1_DA) |

                    (1 << CP0C1_PC) | (1 << CP0C1_WR) | (1 << CP0C1_EP),

        .CP0_Config2 = MIPS_CONFIG2,

        .CP0_Config3 = MIPS_CONFIG3,

        .SYNCI_Step = 32,

        .CCRes = 2,

        .Status_rw_bitmask = 0x36FBFFFF,

        /* The 20Kc has F64 / L / W but doesn't use the fcr0 bits. */

        .CP1_fcr0 = (1 << FCR0_3D) | (1 << FCR0_PS) |

                    (1 << FCR0_D) | (1 << FCR0_S) |

                    (0x82 << FCR0_PRID) | (0x0 << FCR0_REV),

        .SEGBITS = 40,

    },

#endif

};

int mips_find_by_name (const unsigned char *name, mips_def_t **def)

{

    int i, ret;

    ret = -1;

    *def = NULL;

    for (i = 0; i < sizeof(mips_defs) / sizeof(mips_defs[0]); i++) {

        if (strcasecmp(name, mips_defs[i].name) == 0) {

            *def = &mips_defs[i];

            ret = 0;

            break;

        }

    }

    return ret;

}

void mips_cpu_list (FILE *f, int (*cpu_fprintf)(FILE *f, const char *fmt, ...))

{

    int i;

    for (i = 0; i < sizeof(mips_defs) / sizeof(mips_defs[0]); i++) {

        (*cpu_fprintf)(f, "MIPS '%s'\n",

                       mips_defs[i].name);

    }

}

#ifndef CONFIG_USER_ONLY

static void no_mmu_init (CPUMIPSState *env, mips_def_t *def)

{

    env->nb_tlb = 1;

    env->map_address = &no_mmu_map_address;

}

static void fixed_mmu_init (CPUMIPSState *env, mips_def_t *def)

{

    env->nb_tlb = 1;

    env->map_address = &fixed_mmu_map_address;

}

static void r4k_mmu_init (CPUMIPSState *env, mips_def_t *def)

{

    env->nb_tlb = 1 + ((def->CP0_Config1 >> CP0C1_MMU) & 63);

    env->map_address = &r4k_map_address;

    env->do_tlbwi = r4k_do_tlbwi;

    env->do_tlbwr = r4k_do_tlbwr;

    env->do_tlbp = r4k_do_tlbp;

    env->do_tlbr = r4k_do_tlbr;

}

#endif /* CONFIG_USER_ONLY */

int cpu_mips_register (CPUMIPSState *env, mips_def_t *def)

{

    if (!def)

        def = env->cpu_model;

    if (!def)

        cpu_abort(env, "Unable to find MIPS CPU definition\n");

    env->cpu_model = def;

    env->CP0_PRid = def->CP0_PRid;

    env->CP0_Config0 = def->CP0_Config0;

#ifdef TARGET_WORDS_BIGENDIAN

    env->CP0_Config0 |= (1 << CP0C0_BE);

#endif

    env->CP0_Config1 = def->CP0_Config1;

    env->CP0_Config2 = def->CP0_Config2;

    env->CP0_Config3 = def->CP0_Config3;

    env->CP0_Config6 = def->CP0_Config6;

    env->CP0_Config7 = def->CP0_Config7;

    env->SYNCI_Step = def->SYNCI_Step;

    env->CCRes = def->CCRes;

    env->Status_rw_bitmask = def->Status_rw_bitmask;

    env->fcr0 = def->CP1_fcr0;

#ifdef TARGET_MIPS64

    env->SEGBITS = def->SEGBITS;

    env->SEGMask = (3ULL << 62) | ((1ULL << def->SEGBITS) - 1);

#endif

#ifdef CONFIG_USER_ONLY

    if (env->CP0_Config1 & (1 << CP0C1_FP))

        env->hflags |= MIPS_HFLAG_FPU;

    if (env->fcr0 & (1 << FCR0_F64))

        env->hflags |= MIPS_HFLAG_F64;

#else

    /* There are more full-featured MMU variants in older MIPS CPUs,

       R3000, R6000 and R8000 come to mind. If we ever support them,

       this check will need to look up a different place than those

       newfangled config registers. */

    switch ((env->CP0_Config0 >> CP0C0_MT) & 3) {

        case 0:

            no_mmu_init(env, def);

            break;

        case 1:

            r4k_mmu_init(env, def);

            break;

        case 3:

            fixed_mmu_init(env, def);

            break;

        default:

            cpu_abort(env, "MMU type not supported\n");

    }

    env->CP0_Random = env->nb_tlb - 1;

    env->tlb_in_use = env->nb_tlb;

#endif /* CONFIG_USER_ONLY */

    return 0;

}