Commit 6bbd5dde authored by Erlon Cruz's avatar Erlon Cruz Committed by Alexander Graf
Browse files

pseries: Implement h_read hcall 



This h_call is useful for DLPAR in future amongst other things. Given an index
it fetches the corresponding PTE stored in the htab.

Signed-off-by: default avatarErlon Cruz <erlon.cruz@br.flextronics.com>
Acked-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent befa8af3

hw/spapr_hcall.c

+31 −0
Original line number Diff line number Diff line
@@ -323,6 +323,36 @@ static target_ulong h_protect(PowerPCCPU *cpu, sPAPREnvironment *spapr, 
    return H_SUCCESS;

}



static target_ulong h_read(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                           target_ulong opcode, target_ulong *args)

{

    CPUPPCState *env = &cpu->env;

    target_ulong flags = args[0];

    target_ulong pte_index = args[1];

    uint8_t *hpte;

    int i, ridx, n_entries = 1;



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

        return H_PARAMETER;

    }



    if (flags & H_READ_4) {

        /* Clear the two low order bits */

        pte_index &= ~(3ULL);

        n_entries = 4;

    }



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



    for (i = 0, ridx = 0; i < n_entries; i++) {

        args[ridx++] = ldq_p(hpte);

        args[ridx++] = ldq_p(hpte + (HASH_PTE_SIZE_64/2));

        hpte += HASH_PTE_SIZE_64;

    }



    return H_SUCCESS;

}



static target_ulong h_set_dabr(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                               target_ulong opcode, target_ulong *args)

{
@@ -710,6 +740,7 @@ static void hypercall_register_types(void) 
    spapr_register_hypercall(H_ENTER, h_enter);

    spapr_register_hypercall(H_REMOVE, h_remove);

    spapr_register_hypercall(H_PROTECT, h_protect);

    spapr_register_hypercall(H_READ, h_read);



    /* hcall-bulk */

    spapr_register_hypercall(H_BULK_REMOVE, h_bulk_remove);