From 3ba55e399f7637d2b4054bcc30228cd2d0883823 Mon Sep 17 00:00:00 2001 From: Cyril Bur Date: Mon, 2 Mar 2015 17:55:38 +1100 Subject: [PATCH] PPC: Introduce the Virtual Time Base (VTB) SPR register This patch adds basic support for the VTB. PowerISA: The Virtual Time Base (VTB) is a 64-bit incrementing counter. Virtual Time Base increments at the same rate as the Time Base until its value becomes 0xFFFF_FFFF_FFFF_FFFF (2 64 - 1); at the next increment its value becomes 0x0000_0000_0000_0000. There is no interrupt or other indication when this occurs. The operation of the Virtual Time Base has the following additional properties. 1. Loading a GPR from the Virtual Time Base has no effect on the accuracy of the Virtual Time Base. 2. Copying the contents of a GPR to the Virtual Time Base replaces the contents of the Virtual Time Base with the contents of the GPR. Signed-off-by: Cyril Bur Signed-off-by: Alexander Graf --- target-ppc/cpu.h | 1 + target-ppc/translate_init.c | 10 ++++++++++ 2 files changed, 11 insertions(+) diff --git a/target-ppc/cpu.h b/target-ppc/cpu.h index b706b9f..abc3545 100644 --- a/target-ppc/cpu.h +++ b/target-ppc/cpu.h @@ -1624,6 +1624,7 @@ static inline int cpu_mmu_index (CPUPPCState *env) #define SPR_MPC_MD_DBRAM1 (0x32A) #define SPR_RCPU_L2U_RA3 (0x32B) #define SPR_TAR (0x32F) +#define SPR_VTB (0x351) #define SPR_440_INV0 (0x370) #define SPR_440_INV1 (0x371) #define SPR_440_INV2 (0x372) diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c index df1a62c..d74f4f0 100644 --- a/target-ppc/translate_init.c +++ b/target-ppc/translate_init.c @@ -7819,6 +7819,15 @@ static void gen_spr_power8_ebb(CPUPPCState *env) KVM_REG_PPC_BESCR, 0x00000000); } +/* Virtual Time Base */ +static void gen_spr_vtb(CPUPPCState *env) +{ + spr_register(env, SPR_VTB, "VTB", + SPR_NOACCESS, SPR_NOACCESS, + &spr_read_tbl, SPR_NOACCESS, + 0x00000000); +} + static void gen_spr_power8_fscr(CPUPPCState *env) { #if defined(CONFIG_USER_ONLY) @@ -7881,6 +7890,7 @@ static void init_proc_book3s_64(CPUPPCState *env, int version) gen_spr_power8_pmu_sup(env); gen_spr_power8_pmu_user(env); gen_spr_power8_tm(env); + gen_spr_vtb(env); } if (version < BOOK3S_CPU_POWER8) { gen_spr_book3s_dbg(env); -- 2.7.4