From patchwork Mon Feb 18 14:32:21 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: pseries: Implements h_read hcall Date: Mon, 18 Feb 2013 04:32:21 -0000 From: Erlon Cruz X-Patchwork-Id: 221395 Message-Id: <1361197941-18467-1-git-send-email-erlon.cruz@fit-tecnologia.org.br> To: dwg@au1.ibm.com Cc: Erlon Cruz , brenohl@br.ibm.com, qemu-ppc@nongnu.org, agraf@suse.de, qemu-devel@nongnu.org From: Erlon Cruz 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: Erlon Cruz --- hw/spapr_hcall.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c index 2889742..80ace25 100644 --- a/hw/spapr_hcall.c +++ b/hw/spapr_hcall.c @@ -323,6 +323,37 @@ 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]; + target_ulong v[4], r[4]; + 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) { @@ -714,6 +745,7 @@ 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);