From 6bbd5dde9a10520eb069c4bff9f2e34b96b1cfee Mon Sep 17 00:00:00 2001 From: Erlon Cruz Date: Mon, 18 Feb 2013 05:00:32 +0000 Subject: [PATCH] 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: Erlon Cruz Acked-by: David Gibson Signed-off-by: Alexander Graf --- hw/spapr_hcall.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c index 7b8959488e..77c052fcb1 100644 --- a/hw/spapr_hcall.c +++ b/hw/spapr_hcall.c @@ -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);