On Wed, Apr 19, 2017 at 06:48:22PM +0200, Bernhard Kaindl wrote: > 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 ArchitectureĆ¢ 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 <bernhard.kai...@thalesgroup.com> > Reviewed-by: Stefan Resch <stefan.re...@thalesgroup.com>
Applied to ppc-for-2.10. thanks. > --- > 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 77e5463..0ecf541 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); -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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