diff options
Diffstat (limited to 'arch/arc')
| -rw-r--r-- | arch/arc/include/asm/arcregs.h | 8 | ||||
| -rw-r--r-- | arch/arc/kernel/setup.c | 15 |
2 files changed, 15 insertions, 8 deletions
diff --git a/arch/arc/include/asm/arcregs.h b/arch/arc/include/asm/arcregs.h index ba8e802dba80..b71d84873f7d 100644 --- a/arch/arc/include/asm/arcregs.h +++ b/arch/arc/include/asm/arcregs.h @@ -135,12 +135,12 @@ struct bcr_identity { #endif }; -struct bcr_isa { +struct bcr_isa_arcv2 { #ifdef CONFIG_CPU_BIG_ENDIAN unsigned int div_rem:4, pad2:4, ldd:1, unalign:1, atomic:1, be:1, - pad1:11, atomic1:1, ver:8; + pad1:12, ver:8; #else - unsigned int ver:8, atomic1:1, pad1:11, be:1, atomic:1, unalign:1, + unsigned int ver:8, pad1:12, be:1, atomic:1, unalign:1, ldd:1, pad2:4, div_rem:4; #endif }; @@ -263,7 +263,7 @@ struct cpuinfo_arc { struct cpuinfo_arc_mmu mmu; struct cpuinfo_arc_bpu bpu; struct bcr_identity core; - struct bcr_isa isa; + struct bcr_isa_arcv2 isa; const char *details, *name; unsigned int vec_base; struct cpuinfo_arc_ccm iccm, dccm; diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c index 877cec8f5ea2..228593a964f8 100644 --- a/arch/arc/kernel/setup.c +++ b/arch/arc/kernel/setup.c @@ -119,11 +119,11 @@ static void read_arc_build_cfg_regs(void) struct bcr_generic bcr; struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()]; const struct id_to_str *tbl; + struct bcr_isa_arcv2 isa; FIX_PTR(cpu); READ_BCR(AUX_IDENTITY, cpu->core); - READ_BCR(ARC_REG_ISA_CFG_BCR, cpu->isa); for (tbl = &arc_cpu_rel[0]; tbl->id != 0; tbl++) { if (cpu->core.family == tbl->id) { @@ -205,18 +205,25 @@ static void read_arc_build_cfg_regs(void) cpu->extn.debug = cpu->extn.ap | cpu->extn.smart | cpu->extn.rtt; + READ_BCR(ARC_REG_ISA_CFG_BCR, isa); + /* some hacks for lack of feature BCR info in old ARC700 cores */ if (is_isa_arcompact()) { - if (!cpu->isa.ver) /* ISA BCR absent, use Kconfig info */ + if (!isa.ver) /* ISA BCR absent, use Kconfig info */ cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC); - else - cpu->isa.atomic = cpu->isa.atomic1; + else { + /* ARC700_BUILD only has 2 bits of isa info */ + struct bcr_generic bcr = *(struct bcr_generic *)&isa; + cpu->isa.atomic = bcr.info & 1; + } cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN); /* there's no direct way to distinguish 750 vs. 770 */ if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3)) cpu->name = "ARC750"; + } else { + cpu->isa = isa; } } |