Archipelago » qemu

#include "sysemu.h"

#include "cpu.h"

#include "qemu-char.h"

#include "sysemu.h"

#include "qemu-char.h"

#include "exec-all.h"

#include "hw/spapr.h"

#define HPTES_PER_GROUP 8

#define HPTE_V_SSIZE_SHIFT      62

#define HPTE_V_AVPN_SHIFT       7

#define HPTE_V_AVPN             0x3fffffffffffff80ULL

#define HPTE_V_AVPN_VAL(x)      (((x) & HPTE_V_AVPN) >> HPTE_V_AVPN_SHIFT)

#define HPTE_V_COMPARE(x, y)    (!(((x) ^ (y)) & 0xffffffffffffff80UL))

#define HPTE_V_BOLTED           0x0000000000000010ULL

#define HPTE_V_LOCK             0x0000000000000008ULL

#define HPTE_V_LARGE            0x0000000000000004ULL

#define HPTE_V_SECONDARY        0x0000000000000002ULL

#define HPTE_V_VALID            0x0000000000000001ULL

#define HPTE_R_PP0              0x8000000000000000ULL

#define HPTE_R_TS               0x4000000000000000ULL

#define HPTE_R_KEY_HI           0x3000000000000000ULL

#define HPTE_R_RPN_SHIFT        12

#define HPTE_R_RPN              0x3ffffffffffff000ULL

#define HPTE_R_FLAGS            0x00000000000003ffULL

#define HPTE_R_PP               0x0000000000000003ULL

#define HPTE_R_N                0x0000000000000004ULL

#define HPTE_R_G                0x0000000000000008ULL

#define HPTE_R_M                0x0000000000000010ULL

#define HPTE_R_I                0x0000000000000020ULL

#define HPTE_R_W                0x0000000000000040ULL

#define HPTE_R_WIMG             0x0000000000000078ULL

#define HPTE_R_C                0x0000000000000080ULL

#define HPTE_R_R                0x0000000000000100ULL

#define HPTE_R_KEY_LO           0x0000000000000e00ULL

#define HPTE_V_1TB_SEG          0x4000000000000000ULL

#define HPTE_V_VRMA_MASK        0x4001ffffff000000ULL

#define HPTE_V_HVLOCK           0x40ULL

static inline int lock_hpte(void *hpte, target_ulong bits)

{

    uint64_t pteh;

    pteh = ldq_p(hpte);

    /* We're protected by qemu's global lock here */

    if (pteh & bits) {

        return 0;

    }

    stq_p(hpte, pteh | HPTE_V_HVLOCK);

    return 1;

}

static target_ulong compute_tlbie_rb(target_ulong v, target_ulong r,

                                     target_ulong pte_index)

{

    target_ulong rb, va_low;

    rb = (v & ~0x7fULL) << 16; /* AVA field */

    va_low = pte_index >> 3;

    if (v & HPTE_V_SECONDARY) {

        va_low = ~va_low;

    }

    /* xor vsid from AVA */

    if (!(v & HPTE_V_1TB_SEG)) {

        va_low ^= v >> 12;

    } else {

        va_low ^= v >> 24;

    }

    va_low &= 0x7ff;

    if (v & HPTE_V_LARGE) {

        rb |= 1;                         /* L field */

#if 0 /* Disable that P7 specific bit for now */

        if (r & 0xff000) {

            /* non-16MB large page, must be 64k */

            /* (masks depend on page size) */

            rb |= 0x1000;                /* page encoding in LP field */

            rb |= (va_low & 0x7f) << 16; /* 7b of VA in AVA/LP field */

            rb |= (va_low & 0xfe);       /* AVAL field */

        }

#endif

    } else {

        /* 4kB page */

        rb |= (va_low & 0x7ff) << 12;   /* remaining 11b of AVA */

    }

    rb |= (v >> 54) & 0x300;            /* B field */

    return rb;

}

static target_ulong h_enter(CPUState *env, sPAPREnvironment *spapr,

                            target_ulong opcode, target_ulong *args)

{

    target_ulong flags = args[0];

    target_ulong pte_index = args[1];

    target_ulong pteh = args[2];

    target_ulong ptel = args[3];

    target_ulong porder;

    target_ulong i, pa;

    uint8_t *hpte;

    /* only handle 4k and 16M pages for now */

    porder = 12;

    if (pteh & HPTE_V_LARGE) {

#if 0 /* We don't support 64k pages yet */

        if ((ptel & 0xf000) == 0x1000) {

            /* 64k page */

            porder = 16;

        } else

#endif

        if ((ptel & 0xff000) == 0) {

            /* 16M page */

            porder = 24;

            /* lowest AVA bit must be 0 for 16M pages */

            if (pteh & 0x80) {

                return H_PARAMETER;

            }

        } else {

            return H_PARAMETER;

        }

    }

    pa = ptel & HPTE_R_RPN;

    /* FIXME: bounds check the pa? */

    /* Check WIMG */

    if ((ptel & HPTE_R_WIMG) != HPTE_R_M) {

        return H_PARAMETER;

    }

    pteh &= ~0x60ULL;

    if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {

        return H_PARAMETER;

    }

    if (likely((flags & H_EXACT) == 0)) {

        pte_index &= ~7ULL;

        hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);

        for (i = 0; ; ++i) {

            if (i == 8) {

                return H_PTEG_FULL;

            }

            if (((ldq_p(hpte) & HPTE_V_VALID) == 0) &&

                lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {

                break;

            }

            hpte += HASH_PTE_SIZE_64;

        }

    } else {

        i = 0;

        hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);

        if (!lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {

            return H_PTEG_FULL;

        }

    }

    stq_p(hpte + (HASH_PTE_SIZE_64/2), ptel);

    /* eieio();  FIXME: need some sort of barrier for smp? */

    stq_p(hpte, pteh);

    assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));

    args[0] = pte_index + i;

    return H_SUCCESS;

}

static target_ulong h_remove(CPUState *env, sPAPREnvironment *spapr,

                             target_ulong opcode, target_ulong *args)

{

    target_ulong flags = args[0];

    target_ulong pte_index = args[1];

    target_ulong avpn = args[2];

    uint8_t *hpte;

    target_ulong v, r, rb;

    if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {

        return H_PARAMETER;

    }

    hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);

    while (!lock_hpte(hpte, HPTE_V_HVLOCK)) {

        /* We have no real concurrency in qemu soft-emulation, so we

         * will never actually have a contested lock */

        assert(0);

    }

    v = ldq_p(hpte);

    r = ldq_p(hpte + (HASH_PTE_SIZE_64/2));

    if ((v & HPTE_V_VALID) == 0 ||

        ((flags & H_AVPN) && (v & ~0x7fULL) != avpn) ||

        ((flags & H_ANDCOND) && (v & avpn) != 0)) {

        stq_p(hpte, v & ~HPTE_V_HVLOCK);

        assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));

        return H_NOT_FOUND;

    }

    args[0] = v & ~HPTE_V_HVLOCK;

    args[1] = r;

    stq_p(hpte, 0);

    rb = compute_tlbie_rb(v, r, pte_index);

    ppc_tlb_invalidate_one(env, rb);

    assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));

    return H_SUCCESS;

}

static target_ulong h_protect(CPUState *env, sPAPREnvironment *spapr,

                              target_ulong opcode, target_ulong *args)

{

    target_ulong flags = args[0];

    target_ulong pte_index = args[1];

    target_ulong avpn = args[2];

    uint8_t *hpte;

    target_ulong v, r, rb;

    if ((pte_index * HASH_PTE_SIZE_64) & ~env->htab_mask) {

        return H_PARAMETER;

    }

    hpte = env->external_htab + (pte_index * HASH_PTE_SIZE_64);

    while (!lock_hpte(hpte, HPTE_V_HVLOCK)) {

        /* We have no real concurrency in qemu soft-emulation, so we

         * will never actually have a contested lock */

        assert(0);

    }

    v = ldq_p(hpte);

    r = ldq_p(hpte + (HASH_PTE_SIZE_64/2));

    if ((v & HPTE_V_VALID) == 0 ||

        ((flags & H_AVPN) && (v & ~0x7fULL) != avpn)) {

        stq_p(hpte, v & ~HPTE_V_HVLOCK);

        assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));

        return H_NOT_FOUND;

    }

    r &= ~(HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |

           HPTE_R_KEY_HI | HPTE_R_KEY_LO);

    r |= (flags << 55) & HPTE_R_PP0;

    r |= (flags << 48) & HPTE_R_KEY_HI;

    r |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);

    rb = compute_tlbie_rb(v, r, pte_index);

    stq_p(hpte, v & ~HPTE_V_VALID);

    ppc_tlb_invalidate_one(env, rb);

    stq_p(hpte + (HASH_PTE_SIZE_64/2), r);

    /* Don't need a memory barrier, due to qemu's global lock */

    stq_p(hpte, v & ~HPTE_V_HVLOCK);

    assert(!(ldq_p(hpte) & HPTE_V_HVLOCK));

    return H_SUCCESS;

}

spapr_hcall_fn hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];

void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)

{

    spapr_hcall_fn old_fn;

    assert(opcode <= MAX_HCALL_OPCODE);

    assert((opcode & 0x3) == 0);

    old_fn = hypercall_table[opcode / 4];

    assert(!old_fn || (fn == old_fn));

    hypercall_table[opcode / 4] = fn;

}

target_ulong spapr_hypercall(CPUState *env, target_ulong opcode,

                             target_ulong *args)

{

    if (msr_pr) {

        hcall_dprintf("Hypercall made with MSR[PR]=1\n");

        return H_PRIVILEGE;

    }

    if ((opcode <= MAX_HCALL_OPCODE)

        && ((opcode & 0x3) == 0)) {

        spapr_hcall_fn fn = hypercall_table[opcode / 4];

        if (fn) {

            return fn(env, spapr, opcode, args);

        }

    }

    hcall_dprintf("Unimplemented hcall 0x" TARGET_FMT_lx "\n", opcode);

    return H_FUNCTION;

}

static void hypercall_init(void)

{

    /* hcall-pft */

    spapr_register_hypercall(H_ENTER, h_enter);

    spapr_register_hypercall(H_REMOVE, h_remove);

    spapr_register_hypercall(H_PROTECT, h_protect);

}

device_init(hypercall_init);