From b1c897d58729bd5cb390afa4e311dc42b38baf77 Mon Sep 17 00:00:00 2001 From: Bernhard Kaindl Date: Wed, 19 Apr 2017 18:48:22 +0200 Subject: [PATCH] e500,book3s: mfspr 259: Register mapped/aliased SPRG3 user read MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch registers mfspr 259 for Book3S and e500 family cores following this research: mfspr 259 provides read-only mapped user access to SPRG3(SPR 275) according to: - PowerISA 2.02, Book III (documents implementation starting with POWER4+ @ p20) - IBM PowerPC 970MP RISC Microprocessor User's Manual v2.1, page 48 - Amit Singh: "Mac OS X Internals: A Systems Approach" on 970 and 970FX cores: He demonstrates mfspr 259 reading TLS data from Mac OS X on G5 on page 588 - NXP documents it in the Core Reference Manuals of: e500, e500mc and e5500 - getcpu() of the 32 & 64-bit Book3S Linux vDSOs use it to read the core number mfspr 259 does not appear to be implemented in these cores according to: - 74xx series: MPC7410/MPC7400 and MPC7450 RISC Microprocessor Reference Manuals - 4xx series: PPC440 Processor User's Manual, Revision 1.09 by AMCC - 750 series: IBM PowerPC 750CL RISC Microprocessor User's Manual - e200 series: e200z4 Power Architectureâ Core Reference Manual Implementation: gen_spr_usprg3() is called from init_proc_book3s_common() (covers the 970 and POWER cores) and init_proc_e500() (covers the e500 family) to register spr_read_ureg() in the same way which it already provides the mapped SPR access for SPR_USPRG4-7 in gen_spr_usprgh() for cores which have the same read-only mapped SPRG register access for SPRG4-7. Verified using Linux by pinning a thread to a core and checking sched_getcpu() using qemu-system-ppc64 -M pseries -cpu POWER8 using MTTCG on a x86_64 host. Signed-off-by: Bernhard Kaindl Reviewed-by: Stefan Resch Signed-off-by: David Gibson --- target/ppc/translate_init.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/target/ppc/translate_init.c b/target/ppc/translate_init.c index 77e5463a92..0ecf541656 100644 --- a/target/ppc/translate_init.c +++ b/target/ppc/translate_init.c @@ -1640,6 +1640,14 @@ static void spr_write_booke_pid (DisasContext *ctx, int sprn, int gprn) } #endif +static void gen_spr_usprg3 (CPUPPCState *env) +{ + spr_register(env, SPR_USPRG3, "USPRG3", + &spr_read_ureg, SPR_NOACCESS, + &spr_read_ureg, SPR_NOACCESS, + 0x00000000); +} + static void gen_spr_usprgh (CPUPPCState *env) { spr_register(env, SPR_USPRG4, "USPRG4", @@ -4914,6 +4922,7 @@ static void init_proc_e500 (CPUPPCState *env, int version) break; } gen_spr_BookE(env, ivor_mask); + gen_spr_usprg3(env); /* Processor identification */ spr_register(env, SPR_BOOKE_PIR, "PIR", SPR_NOACCESS, SPR_NOACCESS, @@ -8245,6 +8254,7 @@ static void init_proc_book3s_common(CPUPPCState *env) { gen_spr_ne_601(env); gen_tbl(env); + gen_spr_usprg3(env); gen_spr_book3s_altivec(env); gen_spr_book3s_pmu_sup(env); gen_spr_book3s_pmu_user(env); -- GitLab