summaryrefslogtreecommitdiffstats
path: root/arch/mips/kernel/cpu-probe.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/kernel/cpu-probe.c')
-rw-r--r--arch/mips/kernel/cpu-probe.c2045
1 files changed, 2045 insertions, 0 deletions
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
new file mode 100644
index 0000000000..b406d8bfb1
--- /dev/null
+++ b/arch/mips/kernel/cpu-probe.c
@@ -0,0 +1,2045 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Processor capabilities determination functions.
+ *
+ * Copyright (C) xxxx the Anonymous
+ * Copyright (C) 1994 - 2006 Ralf Baechle
+ * Copyright (C) 2003, 2004 Maciej W. Rozycki
+ * Copyright (C) 2001, 2004, 2011, 2012 MIPS Technologies, Inc.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+#include <linux/stddef.h>
+#include <linux/export.h>
+
+#include <asm/bugs.h>
+#include <asm/cpu.h>
+#include <asm/cpu-features.h>
+#include <asm/cpu-type.h>
+#include <asm/fpu.h>
+#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
+#include <asm/msa.h>
+#include <asm/watch.h>
+#include <asm/elf.h>
+#include <asm/pgtable-bits.h>
+#include <asm/spram.h>
+#include <asm/traps.h>
+#include <linux/uaccess.h>
+
+#include "fpu-probe.h"
+
+#include <asm/mach-loongson64/cpucfg-emul.h>
+
+/* Hardware capabilities */
+unsigned int elf_hwcap __read_mostly;
+EXPORT_SYMBOL_GPL(elf_hwcap);
+
+static inline unsigned long cpu_get_msa_id(void)
+{
+ unsigned long status, msa_id;
+
+ status = read_c0_status();
+ __enable_fpu(FPU_64BIT);
+ enable_msa();
+ msa_id = read_msa_ir();
+ disable_msa();
+ write_c0_status(status);
+ return msa_id;
+}
+
+static int mips_dsp_disabled;
+
+static int __init dsp_disable(char *s)
+{
+ cpu_data[0].ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
+ mips_dsp_disabled = 1;
+
+ return 1;
+}
+
+__setup("nodsp", dsp_disable);
+
+static int mips_htw_disabled;
+
+static int __init htw_disable(char *s)
+{
+ mips_htw_disabled = 1;
+ cpu_data[0].options &= ~MIPS_CPU_HTW;
+ write_c0_pwctl(read_c0_pwctl() &
+ ~(1 << MIPS_PWCTL_PWEN_SHIFT));
+
+ return 1;
+}
+
+__setup("nohtw", htw_disable);
+
+static int mips_ftlb_disabled;
+static int mips_has_ftlb_configured;
+
+enum ftlb_flags {
+ FTLB_EN = 1 << 0,
+ FTLB_SET_PROB = 1 << 1,
+};
+
+static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags);
+
+static int __init ftlb_disable(char *s)
+{
+ unsigned int config4, mmuextdef;
+
+ /*
+ * If the core hasn't done any FTLB configuration, there is nothing
+ * for us to do here.
+ */
+ if (!mips_has_ftlb_configured)
+ return 1;
+
+ /* Disable it in the boot cpu */
+ if (set_ftlb_enable(&cpu_data[0], 0)) {
+ pr_warn("Can't turn FTLB off\n");
+ return 1;
+ }
+
+ config4 = read_c0_config4();
+
+ /* Check that FTLB has been disabled */
+ mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
+ /* MMUSIZEEXT == VTLB ON, FTLB OFF */
+ if (mmuextdef == MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT) {
+ /* This should never happen */
+ pr_warn("FTLB could not be disabled!\n");
+ return 1;
+ }
+
+ mips_ftlb_disabled = 1;
+ mips_has_ftlb_configured = 0;
+
+ /*
+ * noftlb is mainly used for debug purposes so print
+ * an informative message instead of using pr_debug()
+ */
+ pr_info("FTLB has been disabled\n");
+
+ /*
+ * Some of these bits are duplicated in the decode_config4.
+ * MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT is the only possible case
+ * once FTLB has been disabled so undo what decode_config4 did.
+ */
+ cpu_data[0].tlbsize -= cpu_data[0].tlbsizeftlbways *
+ cpu_data[0].tlbsizeftlbsets;
+ cpu_data[0].tlbsizeftlbsets = 0;
+ cpu_data[0].tlbsizeftlbways = 0;
+
+ return 1;
+}
+
+__setup("noftlb", ftlb_disable);
+
+/*
+ * Check if the CPU has per tc perf counters
+ */
+static inline void cpu_set_mt_per_tc_perf(struct cpuinfo_mips *c)
+{
+ if (read_c0_config7() & MTI_CONF7_PTC)
+ c->options |= MIPS_CPU_MT_PER_TC_PERF_COUNTERS;
+}
+
+static inline void check_errata(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+
+ switch (current_cpu_type()) {
+ case CPU_34K:
+ /*
+ * Erratum "RPS May Cause Incorrect Instruction Execution"
+ * This code only handles VPE0, any SMP/RTOS code
+ * making use of VPE1 will be responsible for that VPE.
+ */
+ if ((c->processor_id & PRID_REV_MASK) <= PRID_REV_34K_V1_0_2)
+ write_c0_config7(read_c0_config7() | MIPS_CONF7_RPS);
+ break;
+ default:
+ break;
+ }
+}
+
+void __init check_bugs32(void)
+{
+ check_errata();
+}
+
+/*
+ * Probe whether cpu has config register by trying to play with
+ * alternate cache bit and see whether it matters.
+ * It's used by cpu_probe to distinguish between R3000A and R3081.
+ */
+static inline int cpu_has_confreg(void)
+{
+#ifdef CONFIG_CPU_R3000
+ extern unsigned long r3k_cache_size(unsigned long);
+ unsigned long size1, size2;
+ unsigned long cfg = read_c0_conf();
+
+ size1 = r3k_cache_size(ST0_ISC);
+ write_c0_conf(cfg ^ R30XX_CONF_AC);
+ size2 = r3k_cache_size(ST0_ISC);
+ write_c0_conf(cfg);
+ return size1 != size2;
+#else
+ return 0;
+#endif
+}
+
+static inline void set_elf_platform(int cpu, const char *plat)
+{
+ if (cpu == 0)
+ __elf_platform = plat;
+}
+
+static inline void set_elf_base_platform(const char *plat)
+{
+ if (__elf_base_platform == NULL) {
+ __elf_base_platform = plat;
+ }
+}
+
+static inline void cpu_probe_vmbits(struct cpuinfo_mips *c)
+{
+#ifdef __NEED_VMBITS_PROBE
+ write_c0_entryhi(0x3fffffffffffe000ULL);
+ back_to_back_c0_hazard();
+ c->vmbits = fls64(read_c0_entryhi() & 0x3fffffffffffe000ULL);
+#endif
+}
+
+static void set_isa(struct cpuinfo_mips *c, unsigned int isa)
+{
+ switch (isa) {
+ case MIPS_CPU_ISA_M64R5:
+ c->isa_level |= MIPS_CPU_ISA_M32R5 | MIPS_CPU_ISA_M64R5;
+ set_elf_base_platform("mips64r5");
+ fallthrough;
+ case MIPS_CPU_ISA_M64R2:
+ c->isa_level |= MIPS_CPU_ISA_M32R2 | MIPS_CPU_ISA_M64R2;
+ set_elf_base_platform("mips64r2");
+ fallthrough;
+ case MIPS_CPU_ISA_M64R1:
+ c->isa_level |= MIPS_CPU_ISA_M32R1 | MIPS_CPU_ISA_M64R1;
+ set_elf_base_platform("mips64");
+ fallthrough;
+ case MIPS_CPU_ISA_V:
+ c->isa_level |= MIPS_CPU_ISA_V;
+ set_elf_base_platform("mips5");
+ fallthrough;
+ case MIPS_CPU_ISA_IV:
+ c->isa_level |= MIPS_CPU_ISA_IV;
+ set_elf_base_platform("mips4");
+ fallthrough;
+ case MIPS_CPU_ISA_III:
+ c->isa_level |= MIPS_CPU_ISA_II | MIPS_CPU_ISA_III;
+ set_elf_base_platform("mips3");
+ break;
+
+ /* R6 incompatible with everything else */
+ case MIPS_CPU_ISA_M64R6:
+ c->isa_level |= MIPS_CPU_ISA_M32R6 | MIPS_CPU_ISA_M64R6;
+ set_elf_base_platform("mips64r6");
+ fallthrough;
+ case MIPS_CPU_ISA_M32R6:
+ c->isa_level |= MIPS_CPU_ISA_M32R6;
+ set_elf_base_platform("mips32r6");
+ /* Break here so we don't add incompatible ISAs */
+ break;
+ case MIPS_CPU_ISA_M32R5:
+ c->isa_level |= MIPS_CPU_ISA_M32R5;
+ set_elf_base_platform("mips32r5");
+ fallthrough;
+ case MIPS_CPU_ISA_M32R2:
+ c->isa_level |= MIPS_CPU_ISA_M32R2;
+ set_elf_base_platform("mips32r2");
+ fallthrough;
+ case MIPS_CPU_ISA_M32R1:
+ c->isa_level |= MIPS_CPU_ISA_M32R1;
+ set_elf_base_platform("mips32");
+ fallthrough;
+ case MIPS_CPU_ISA_II:
+ c->isa_level |= MIPS_CPU_ISA_II;
+ set_elf_base_platform("mips2");
+ break;
+ }
+}
+
+static char unknown_isa[] = KERN_ERR \
+ "Unsupported ISA type, c0.config0: %d.";
+
+static unsigned int calculate_ftlb_probability(struct cpuinfo_mips *c)
+{
+
+ unsigned int probability = c->tlbsize / c->tlbsizevtlb;
+
+ /*
+ * 0 = All TLBWR instructions go to FTLB
+ * 1 = 15:1: For every 16 TBLWR instructions, 15 go to the
+ * FTLB and 1 goes to the VTLB.
+ * 2 = 7:1: As above with 7:1 ratio.
+ * 3 = 3:1: As above with 3:1 ratio.
+ *
+ * Use the linear midpoint as the probability threshold.
+ */
+ if (probability >= 12)
+ return 1;
+ else if (probability >= 6)
+ return 2;
+ else
+ /*
+ * So FTLB is less than 4 times bigger than VTLB.
+ * A 3:1 ratio can still be useful though.
+ */
+ return 3;
+}
+
+static int set_ftlb_enable(struct cpuinfo_mips *c, enum ftlb_flags flags)
+{
+ unsigned int config;
+
+ /* It's implementation dependent how the FTLB can be enabled */
+ switch (c->cputype) {
+ case CPU_PROAPTIV:
+ case CPU_P5600:
+ case CPU_P6600:
+ /* proAptiv & related cores use Config6 to enable the FTLB */
+ config = read_c0_config6();
+
+ if (flags & FTLB_EN)
+ config |= MTI_CONF6_FTLBEN;
+ else
+ config &= ~MTI_CONF6_FTLBEN;
+
+ if (flags & FTLB_SET_PROB) {
+ config &= ~(3 << MTI_CONF6_FTLBP_SHIFT);
+ config |= calculate_ftlb_probability(c)
+ << MTI_CONF6_FTLBP_SHIFT;
+ }
+
+ write_c0_config6(config);
+ back_to_back_c0_hazard();
+ break;
+ case CPU_I6400:
+ case CPU_I6500:
+ /* There's no way to disable the FTLB */
+ if (!(flags & FTLB_EN))
+ return 1;
+ return 0;
+ case CPU_LOONGSON64:
+ /* Flush ITLB, DTLB, VTLB and FTLB */
+ write_c0_diag(LOONGSON_DIAG_ITLB | LOONGSON_DIAG_DTLB |
+ LOONGSON_DIAG_VTLB | LOONGSON_DIAG_FTLB);
+ /* Loongson-3 cores use Config6 to enable the FTLB */
+ config = read_c0_config6();
+ if (flags & FTLB_EN)
+ /* Enable FTLB */
+ write_c0_config6(config & ~LOONGSON_CONF6_FTLBDIS);
+ else
+ /* Disable FTLB */
+ write_c0_config6(config | LOONGSON_CONF6_FTLBDIS);
+ break;
+ default:
+ return 1;
+ }
+
+ return 0;
+}
+
+static int mm_config(struct cpuinfo_mips *c)
+{
+ unsigned int config0, update, mm;
+
+ config0 = read_c0_config();
+ mm = config0 & MIPS_CONF_MM;
+
+ /*
+ * It's implementation dependent what type of write-merge is supported
+ * and whether it can be enabled/disabled. If it is settable lets make
+ * the merging allowed by default. Some platforms might have
+ * write-through caching unsupported. In this case just ignore the
+ * CP0.Config.MM bit field value.
+ */
+ switch (c->cputype) {
+ case CPU_24K:
+ case CPU_34K:
+ case CPU_74K:
+ case CPU_P5600:
+ case CPU_P6600:
+ c->options |= MIPS_CPU_MM_FULL;
+ update = MIPS_CONF_MM_FULL;
+ break;
+ case CPU_1004K:
+ case CPU_1074K:
+ case CPU_INTERAPTIV:
+ case CPU_PROAPTIV:
+ mm = 0;
+ fallthrough;
+ default:
+ update = 0;
+ break;
+ }
+
+ if (update) {
+ config0 = (config0 & ~MIPS_CONF_MM) | update;
+ write_c0_config(config0);
+ } else if (mm == MIPS_CONF_MM_SYSAD) {
+ c->options |= MIPS_CPU_MM_SYSAD;
+ } else if (mm == MIPS_CONF_MM_FULL) {
+ c->options |= MIPS_CPU_MM_FULL;
+ }
+
+ return 0;
+}
+
+static inline unsigned int decode_config0(struct cpuinfo_mips *c)
+{
+ unsigned int config0;
+ int isa, mt;
+
+ config0 = read_c0_config();
+
+ /*
+ * Look for Standard TLB or Dual VTLB and FTLB
+ */
+ mt = config0 & MIPS_CONF_MT;
+ if (mt == MIPS_CONF_MT_TLB)
+ c->options |= MIPS_CPU_TLB;
+ else if (mt == MIPS_CONF_MT_FTLB)
+ c->options |= MIPS_CPU_TLB | MIPS_CPU_FTLB;
+
+ isa = (config0 & MIPS_CONF_AT) >> 13;
+ switch (isa) {
+ case 0:
+ switch ((config0 & MIPS_CONF_AR) >> 10) {
+ case 0:
+ set_isa(c, MIPS_CPU_ISA_M32R1);
+ break;
+ case 1:
+ set_isa(c, MIPS_CPU_ISA_M32R2);
+ break;
+ case 2:
+ set_isa(c, MIPS_CPU_ISA_M32R6);
+ break;
+ default:
+ goto unknown;
+ }
+ break;
+ case 2:
+ switch ((config0 & MIPS_CONF_AR) >> 10) {
+ case 0:
+ set_isa(c, MIPS_CPU_ISA_M64R1);
+ break;
+ case 1:
+ set_isa(c, MIPS_CPU_ISA_M64R2);
+ break;
+ case 2:
+ set_isa(c, MIPS_CPU_ISA_M64R6);
+ break;
+ default:
+ goto unknown;
+ }
+ break;
+ default:
+ goto unknown;
+ }
+
+ return config0 & MIPS_CONF_M;
+
+unknown:
+ panic(unknown_isa, config0);
+}
+
+static inline unsigned int decode_config1(struct cpuinfo_mips *c)
+{
+ unsigned int config1;
+
+ config1 = read_c0_config1();
+
+ if (config1 & MIPS_CONF1_MD)
+ c->ases |= MIPS_ASE_MDMX;
+ if (config1 & MIPS_CONF1_PC)
+ c->options |= MIPS_CPU_PERF;
+ if (config1 & MIPS_CONF1_WR)
+ c->options |= MIPS_CPU_WATCH;
+ if (config1 & MIPS_CONF1_CA)
+ c->ases |= MIPS_ASE_MIPS16;
+ if (config1 & MIPS_CONF1_EP)
+ c->options |= MIPS_CPU_EJTAG;
+ if (config1 & MIPS_CONF1_FP) {
+ c->options |= MIPS_CPU_FPU;
+ c->options |= MIPS_CPU_32FPR;
+ }
+ if (cpu_has_tlb) {
+ c->tlbsize = ((config1 & MIPS_CONF1_TLBS) >> 25) + 1;
+ c->tlbsizevtlb = c->tlbsize;
+ c->tlbsizeftlbsets = 0;
+ }
+
+ return config1 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_config2(struct cpuinfo_mips *c)
+{
+ unsigned int config2;
+
+ config2 = read_c0_config2();
+
+ if (config2 & MIPS_CONF2_SL)
+ c->scache.flags &= ~MIPS_CACHE_NOT_PRESENT;
+
+ return config2 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_config3(struct cpuinfo_mips *c)
+{
+ unsigned int config3;
+
+ config3 = read_c0_config3();
+
+ if (config3 & MIPS_CONF3_SM) {
+ c->ases |= MIPS_ASE_SMARTMIPS;
+ c->options |= MIPS_CPU_RIXI | MIPS_CPU_CTXTC;
+ }
+ if (config3 & MIPS_CONF3_RXI)
+ c->options |= MIPS_CPU_RIXI;
+ if (config3 & MIPS_CONF3_CTXTC)
+ c->options |= MIPS_CPU_CTXTC;
+ if (config3 & MIPS_CONF3_DSP)
+ c->ases |= MIPS_ASE_DSP;
+ if (config3 & MIPS_CONF3_DSP2P) {
+ c->ases |= MIPS_ASE_DSP2P;
+ if (cpu_has_mips_r6)
+ c->ases |= MIPS_ASE_DSP3;
+ }
+ if (config3 & MIPS_CONF3_VINT)
+ c->options |= MIPS_CPU_VINT;
+ if (config3 & MIPS_CONF3_VEIC)
+ c->options |= MIPS_CPU_VEIC;
+ if (config3 & MIPS_CONF3_LPA)
+ c->options |= MIPS_CPU_LPA;
+ if (config3 & MIPS_CONF3_MT)
+ c->ases |= MIPS_ASE_MIPSMT;
+ if (config3 & MIPS_CONF3_ULRI)
+ c->options |= MIPS_CPU_ULRI;
+ if (config3 & MIPS_CONF3_ISA)
+ c->options |= MIPS_CPU_MICROMIPS;
+ if (config3 & MIPS_CONF3_VZ)
+ c->ases |= MIPS_ASE_VZ;
+ if (config3 & MIPS_CONF3_SC)
+ c->options |= MIPS_CPU_SEGMENTS;
+ if (config3 & MIPS_CONF3_BI)
+ c->options |= MIPS_CPU_BADINSTR;
+ if (config3 & MIPS_CONF3_BP)
+ c->options |= MIPS_CPU_BADINSTRP;
+ if (config3 & MIPS_CONF3_MSA)
+ c->ases |= MIPS_ASE_MSA;
+ if (config3 & MIPS_CONF3_PW) {
+ c->htw_seq = 0;
+ c->options |= MIPS_CPU_HTW;
+ }
+ if (config3 & MIPS_CONF3_CDMM)
+ c->options |= MIPS_CPU_CDMM;
+ if (config3 & MIPS_CONF3_SP)
+ c->options |= MIPS_CPU_SP;
+
+ return config3 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_config4(struct cpuinfo_mips *c)
+{
+ unsigned int config4;
+ unsigned int newcf4;
+ unsigned int mmuextdef;
+ unsigned int ftlb_page = MIPS_CONF4_FTLBPAGESIZE;
+ unsigned long asid_mask;
+
+ config4 = read_c0_config4();
+
+ if (cpu_has_tlb) {
+ if (((config4 & MIPS_CONF4_IE) >> 29) == 2)
+ c->options |= MIPS_CPU_TLBINV;
+
+ /*
+ * R6 has dropped the MMUExtDef field from config4.
+ * On R6 the fields always describe the FTLB, and only if it is
+ * present according to Config.MT.
+ */
+ if (!cpu_has_mips_r6)
+ mmuextdef = config4 & MIPS_CONF4_MMUEXTDEF;
+ else if (cpu_has_ftlb)
+ mmuextdef = MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT;
+ else
+ mmuextdef = 0;
+
+ switch (mmuextdef) {
+ case MIPS_CONF4_MMUEXTDEF_MMUSIZEEXT:
+ c->tlbsize += (config4 & MIPS_CONF4_MMUSIZEEXT) * 0x40;
+ c->tlbsizevtlb = c->tlbsize;
+ break;
+ case MIPS_CONF4_MMUEXTDEF_VTLBSIZEEXT:
+ c->tlbsizevtlb +=
+ ((config4 & MIPS_CONF4_VTLBSIZEEXT) >>
+ MIPS_CONF4_VTLBSIZEEXT_SHIFT) * 0x40;
+ c->tlbsize = c->tlbsizevtlb;
+ ftlb_page = MIPS_CONF4_VFTLBPAGESIZE;
+ fallthrough;
+ case MIPS_CONF4_MMUEXTDEF_FTLBSIZEEXT:
+ if (mips_ftlb_disabled)
+ break;
+ newcf4 = (config4 & ~ftlb_page) |
+ (page_size_ftlb(mmuextdef) <<
+ MIPS_CONF4_FTLBPAGESIZE_SHIFT);
+ write_c0_config4(newcf4);
+ back_to_back_c0_hazard();
+ config4 = read_c0_config4();
+ if (config4 != newcf4) {
+ pr_err("PAGE_SIZE 0x%lx is not supported by FTLB (config4=0x%x)\n",
+ PAGE_SIZE, config4);
+ /* Switch FTLB off */
+ set_ftlb_enable(c, 0);
+ mips_ftlb_disabled = 1;
+ break;
+ }
+ c->tlbsizeftlbsets = 1 <<
+ ((config4 & MIPS_CONF4_FTLBSETS) >>
+ MIPS_CONF4_FTLBSETS_SHIFT);
+ c->tlbsizeftlbways = ((config4 & MIPS_CONF4_FTLBWAYS) >>
+ MIPS_CONF4_FTLBWAYS_SHIFT) + 2;
+ c->tlbsize += c->tlbsizeftlbways * c->tlbsizeftlbsets;
+ mips_has_ftlb_configured = 1;
+ break;
+ }
+ }
+
+ c->kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST)
+ >> MIPS_CONF4_KSCREXIST_SHIFT;
+
+ asid_mask = MIPS_ENTRYHI_ASID;
+ if (config4 & MIPS_CONF4_AE)
+ asid_mask |= MIPS_ENTRYHI_ASIDX;
+ set_cpu_asid_mask(c, asid_mask);
+
+ /*
+ * Warn if the computed ASID mask doesn't match the mask the kernel
+ * is built for. This may indicate either a serious problem or an
+ * easy optimisation opportunity, but either way should be addressed.
+ */
+ WARN_ON(asid_mask != cpu_asid_mask(c));
+
+ return config4 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_config5(struct cpuinfo_mips *c)
+{
+ unsigned int config5, max_mmid_width;
+ unsigned long asid_mask;
+
+ config5 = read_c0_config5();
+ config5 &= ~(MIPS_CONF5_UFR | MIPS_CONF5_UFE);
+
+ if (cpu_has_mips_r6) {
+ if (!__builtin_constant_p(cpu_has_mmid) || cpu_has_mmid)
+ config5 |= MIPS_CONF5_MI;
+ else
+ config5 &= ~MIPS_CONF5_MI;
+ }
+
+ write_c0_config5(config5);
+
+ if (config5 & MIPS_CONF5_EVA)
+ c->options |= MIPS_CPU_EVA;
+ if (config5 & MIPS_CONF5_MRP)
+ c->options |= MIPS_CPU_MAAR;
+ if (config5 & MIPS_CONF5_LLB)
+ c->options |= MIPS_CPU_RW_LLB;
+ if (config5 & MIPS_CONF5_MVH)
+ c->options |= MIPS_CPU_MVH;
+ if (cpu_has_mips_r6 && (config5 & MIPS_CONF5_VP))
+ c->options |= MIPS_CPU_VP;
+ if (config5 & MIPS_CONF5_CA2)
+ c->ases |= MIPS_ASE_MIPS16E2;
+
+ if (config5 & MIPS_CONF5_CRCP)
+ elf_hwcap |= HWCAP_MIPS_CRC32;
+
+ if (cpu_has_mips_r6) {
+ /* Ensure the write to config5 above takes effect */
+ back_to_back_c0_hazard();
+
+ /* Check whether we successfully enabled MMID support */
+ config5 = read_c0_config5();
+ if (config5 & MIPS_CONF5_MI)
+ c->options |= MIPS_CPU_MMID;
+
+ /*
+ * Warn if we've hardcoded cpu_has_mmid to a value unsuitable
+ * for the CPU we're running on, or if CPUs in an SMP system
+ * have inconsistent MMID support.
+ */
+ WARN_ON(!!cpu_has_mmid != !!(config5 & MIPS_CONF5_MI));
+
+ if (cpu_has_mmid) {
+ write_c0_memorymapid(~0ul);
+ back_to_back_c0_hazard();
+ asid_mask = read_c0_memorymapid();
+
+ /*
+ * We maintain a bitmap to track MMID allocation, and
+ * need a sensible upper bound on the size of that
+ * bitmap. The initial CPU with MMID support (I6500)
+ * supports 16 bit MMIDs, which gives us an 8KiB
+ * bitmap. The architecture recommends that hardware
+ * support 32 bit MMIDs, which would give us a 512MiB
+ * bitmap - that's too big in most cases.
+ *
+ * Cap MMID width at 16 bits for now & we can revisit
+ * this if & when hardware supports anything wider.
+ */
+ max_mmid_width = 16;
+ if (asid_mask > GENMASK(max_mmid_width - 1, 0)) {
+ pr_info("Capping MMID width at %d bits",
+ max_mmid_width);
+ asid_mask = GENMASK(max_mmid_width - 1, 0);
+ }
+
+ set_cpu_asid_mask(c, asid_mask);
+ }
+ }
+
+ return config5 & MIPS_CONF_M;
+}
+
+static void decode_configs(struct cpuinfo_mips *c)
+{
+ int ok;
+
+ /* MIPS32 or MIPS64 compliant CPU. */
+ c->options = MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE | MIPS_CPU_COUNTER |
+ MIPS_CPU_DIVEC | MIPS_CPU_LLSC | MIPS_CPU_MCHECK;
+
+ c->scache.flags = MIPS_CACHE_NOT_PRESENT;
+
+ /* Enable FTLB if present and not disabled */
+ set_ftlb_enable(c, mips_ftlb_disabled ? 0 : FTLB_EN);
+
+ ok = decode_config0(c); /* Read Config registers. */
+ BUG_ON(!ok); /* Arch spec violation! */
+ if (ok)
+ ok = decode_config1(c);
+ if (ok)
+ ok = decode_config2(c);
+ if (ok)
+ ok = decode_config3(c);
+ if (ok)
+ ok = decode_config4(c);
+ if (ok)
+ ok = decode_config5(c);
+
+ /* Probe the EBase.WG bit */
+ if (cpu_has_mips_r2_r6) {
+ u64 ebase;
+ unsigned int status;
+
+ /* {read,write}_c0_ebase_64() may be UNDEFINED prior to r6 */
+ ebase = cpu_has_mips64r6 ? read_c0_ebase_64()
+ : (s32)read_c0_ebase();
+ if (ebase & MIPS_EBASE_WG) {
+ /* WG bit already set, we can avoid the clumsy probe */
+ c->options |= MIPS_CPU_EBASE_WG;
+ } else {
+ /* Its UNDEFINED to change EBase while BEV=0 */
+ status = read_c0_status();
+ write_c0_status(status | ST0_BEV);
+ irq_enable_hazard();
+ /*
+ * On pre-r6 cores, this may well clobber the upper bits
+ * of EBase. This is hard to avoid without potentially
+ * hitting UNDEFINED dm*c0 behaviour if EBase is 32-bit.
+ */
+ if (cpu_has_mips64r6)
+ write_c0_ebase_64(ebase | MIPS_EBASE_WG);
+ else
+ write_c0_ebase(ebase | MIPS_EBASE_WG);
+ back_to_back_c0_hazard();
+ /* Restore BEV */
+ write_c0_status(status);
+ if (read_c0_ebase() & MIPS_EBASE_WG) {
+ c->options |= MIPS_CPU_EBASE_WG;
+ write_c0_ebase(ebase);
+ }
+ }
+ }
+
+ /* configure the FTLB write probability */
+ set_ftlb_enable(c, (mips_ftlb_disabled ? 0 : FTLB_EN) | FTLB_SET_PROB);
+
+ mips_probe_watch_registers(c);
+
+#ifndef CONFIG_MIPS_CPS
+ if (cpu_has_mips_r2_r6) {
+ unsigned int core;
+
+ core = get_ebase_cpunum();
+ if (cpu_has_mipsmt)
+ core >>= fls(core_nvpes()) - 1;
+ cpu_set_core(c, core);
+ }
+#endif
+}
+
+/*
+ * Probe for certain guest capabilities by writing config bits and reading back.
+ * Finally write back the original value.
+ */
+#define probe_gc0_config(name, maxconf, bits) \
+do { \
+ unsigned int tmp; \
+ tmp = read_gc0_##name(); \
+ write_gc0_##name(tmp | (bits)); \
+ back_to_back_c0_hazard(); \
+ maxconf = read_gc0_##name(); \
+ write_gc0_##name(tmp); \
+} while (0)
+
+/*
+ * Probe for dynamic guest capabilities by changing certain config bits and
+ * reading back to see if they change. Finally write back the original value.
+ */
+#define probe_gc0_config_dyn(name, maxconf, dynconf, bits) \
+do { \
+ maxconf = read_gc0_##name(); \
+ write_gc0_##name(maxconf ^ (bits)); \
+ back_to_back_c0_hazard(); \
+ dynconf = maxconf ^ read_gc0_##name(); \
+ write_gc0_##name(maxconf); \
+ maxconf |= dynconf; \
+} while (0)
+
+static inline unsigned int decode_guest_config0(struct cpuinfo_mips *c)
+{
+ unsigned int config0;
+
+ probe_gc0_config(config, config0, MIPS_CONF_M);
+
+ if (config0 & MIPS_CONF_M)
+ c->guest.conf |= BIT(1);
+ return config0 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_guest_config1(struct cpuinfo_mips *c)
+{
+ unsigned int config1, config1_dyn;
+
+ probe_gc0_config_dyn(config1, config1, config1_dyn,
+ MIPS_CONF_M | MIPS_CONF1_PC | MIPS_CONF1_WR |
+ MIPS_CONF1_FP);
+
+ if (config1 & MIPS_CONF1_FP)
+ c->guest.options |= MIPS_CPU_FPU;
+ if (config1_dyn & MIPS_CONF1_FP)
+ c->guest.options_dyn |= MIPS_CPU_FPU;
+
+ if (config1 & MIPS_CONF1_WR)
+ c->guest.options |= MIPS_CPU_WATCH;
+ if (config1_dyn & MIPS_CONF1_WR)
+ c->guest.options_dyn |= MIPS_CPU_WATCH;
+
+ if (config1 & MIPS_CONF1_PC)
+ c->guest.options |= MIPS_CPU_PERF;
+ if (config1_dyn & MIPS_CONF1_PC)
+ c->guest.options_dyn |= MIPS_CPU_PERF;
+
+ if (config1 & MIPS_CONF_M)
+ c->guest.conf |= BIT(2);
+ return config1 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_guest_config2(struct cpuinfo_mips *c)
+{
+ unsigned int config2;
+
+ probe_gc0_config(config2, config2, MIPS_CONF_M);
+
+ if (config2 & MIPS_CONF_M)
+ c->guest.conf |= BIT(3);
+ return config2 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_guest_config3(struct cpuinfo_mips *c)
+{
+ unsigned int config3, config3_dyn;
+
+ probe_gc0_config_dyn(config3, config3, config3_dyn,
+ MIPS_CONF_M | MIPS_CONF3_MSA | MIPS_CONF3_ULRI |
+ MIPS_CONF3_CTXTC);
+
+ if (config3 & MIPS_CONF3_CTXTC)
+ c->guest.options |= MIPS_CPU_CTXTC;
+ if (config3_dyn & MIPS_CONF3_CTXTC)
+ c->guest.options_dyn |= MIPS_CPU_CTXTC;
+
+ if (config3 & MIPS_CONF3_PW)
+ c->guest.options |= MIPS_CPU_HTW;
+
+ if (config3 & MIPS_CONF3_ULRI)
+ c->guest.options |= MIPS_CPU_ULRI;
+
+ if (config3 & MIPS_CONF3_SC)
+ c->guest.options |= MIPS_CPU_SEGMENTS;
+
+ if (config3 & MIPS_CONF3_BI)
+ c->guest.options |= MIPS_CPU_BADINSTR;
+ if (config3 & MIPS_CONF3_BP)
+ c->guest.options |= MIPS_CPU_BADINSTRP;
+
+ if (config3 & MIPS_CONF3_MSA)
+ c->guest.ases |= MIPS_ASE_MSA;
+ if (config3_dyn & MIPS_CONF3_MSA)
+ c->guest.ases_dyn |= MIPS_ASE_MSA;
+
+ if (config3 & MIPS_CONF_M)
+ c->guest.conf |= BIT(4);
+ return config3 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_guest_config4(struct cpuinfo_mips *c)
+{
+ unsigned int config4;
+
+ probe_gc0_config(config4, config4,
+ MIPS_CONF_M | MIPS_CONF4_KSCREXIST);
+
+ c->guest.kscratch_mask = (config4 & MIPS_CONF4_KSCREXIST)
+ >> MIPS_CONF4_KSCREXIST_SHIFT;
+
+ if (config4 & MIPS_CONF_M)
+ c->guest.conf |= BIT(5);
+ return config4 & MIPS_CONF_M;
+}
+
+static inline unsigned int decode_guest_config5(struct cpuinfo_mips *c)
+{
+ unsigned int config5, config5_dyn;
+
+ probe_gc0_config_dyn(config5, config5, config5_dyn,
+ MIPS_CONF_M | MIPS_CONF5_MVH | MIPS_CONF5_MRP);
+
+ if (config5 & MIPS_CONF5_MRP)
+ c->guest.options |= MIPS_CPU_MAAR;
+ if (config5_dyn & MIPS_CONF5_MRP)
+ c->guest.options_dyn |= MIPS_CPU_MAAR;
+
+ if (config5 & MIPS_CONF5_LLB)
+ c->guest.options |= MIPS_CPU_RW_LLB;
+
+ if (config5 & MIPS_CONF5_MVH)
+ c->guest.options |= MIPS_CPU_MVH;
+
+ if (config5 & MIPS_CONF_M)
+ c->guest.conf |= BIT(6);
+ return config5 & MIPS_CONF_M;
+}
+
+static inline void decode_guest_configs(struct cpuinfo_mips *c)
+{
+ unsigned int ok;
+
+ ok = decode_guest_config0(c);
+ if (ok)
+ ok = decode_guest_config1(c);
+ if (ok)
+ ok = decode_guest_config2(c);
+ if (ok)
+ ok = decode_guest_config3(c);
+ if (ok)
+ ok = decode_guest_config4(c);
+ if (ok)
+ decode_guest_config5(c);
+}
+
+static inline void cpu_probe_guestctl0(struct cpuinfo_mips *c)
+{
+ unsigned int guestctl0, temp;
+
+ guestctl0 = read_c0_guestctl0();
+
+ if (guestctl0 & MIPS_GCTL0_G0E)
+ c->options |= MIPS_CPU_GUESTCTL0EXT;
+ if (guestctl0 & MIPS_GCTL0_G1)
+ c->options |= MIPS_CPU_GUESTCTL1;
+ if (guestctl0 & MIPS_GCTL0_G2)
+ c->options |= MIPS_CPU_GUESTCTL2;
+ if (!(guestctl0 & MIPS_GCTL0_RAD)) {
+ c->options |= MIPS_CPU_GUESTID;
+
+ /*
+ * Probe for Direct Root to Guest (DRG). Set GuestCtl1.RID = 0
+ * first, otherwise all data accesses will be fully virtualised
+ * as if they were performed by guest mode.
+ */
+ write_c0_guestctl1(0);
+ tlbw_use_hazard();
+
+ write_c0_guestctl0(guestctl0 | MIPS_GCTL0_DRG);
+ back_to_back_c0_hazard();
+ temp = read_c0_guestctl0();
+
+ if (temp & MIPS_GCTL0_DRG) {
+ write_c0_guestctl0(guestctl0);
+ c->options |= MIPS_CPU_DRG;
+ }
+ }
+}
+
+static inline void cpu_probe_guestctl1(struct cpuinfo_mips *c)
+{
+ if (cpu_has_guestid) {
+ /* determine the number of bits of GuestID available */
+ write_c0_guestctl1(MIPS_GCTL1_ID);
+ back_to_back_c0_hazard();
+ c->guestid_mask = (read_c0_guestctl1() & MIPS_GCTL1_ID)
+ >> MIPS_GCTL1_ID_SHIFT;
+ write_c0_guestctl1(0);
+ }
+}
+
+static inline void cpu_probe_gtoffset(struct cpuinfo_mips *c)
+{
+ /* determine the number of bits of GTOffset available */
+ write_c0_gtoffset(0xffffffff);
+ back_to_back_c0_hazard();
+ c->gtoffset_mask = read_c0_gtoffset();
+ write_c0_gtoffset(0);
+}
+
+static inline void cpu_probe_vz(struct cpuinfo_mips *c)
+{
+ cpu_probe_guestctl0(c);
+ if (cpu_has_guestctl1)
+ cpu_probe_guestctl1(c);
+
+ cpu_probe_gtoffset(c);
+
+ decode_guest_configs(c);
+}
+
+#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
+ | MIPS_CPU_COUNTER)
+
+static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_R2000:
+ c->cputype = CPU_R2000;
+ __cpu_name[cpu] = "R2000";
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
+ MIPS_CPU_NOFPUEX;
+ if (__cpu_has_fpu())
+ c->options |= MIPS_CPU_FPU;
+ c->tlbsize = 64;
+ break;
+ case PRID_IMP_R3000:
+ if ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
+ if (cpu_has_confreg()) {
+ c->cputype = CPU_R3081E;
+ __cpu_name[cpu] = "R3081";
+ } else {
+ c->cputype = CPU_R3000A;
+ __cpu_name[cpu] = "R3000A";
+ }
+ } else {
+ c->cputype = CPU_R3000;
+ __cpu_name[cpu] = "R3000";
+ }
+ c->fpu_msk31 |= FPU_CSR_CONDX | FPU_CSR_FS;
+ c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
+ MIPS_CPU_NOFPUEX;
+ if (__cpu_has_fpu())
+ c->options |= MIPS_CPU_FPU;
+ c->tlbsize = 64;
+ break;
+ case PRID_IMP_R4000:
+ if (read_c0_config() & CONF_SC) {
+ if ((c->processor_id & PRID_REV_MASK) >=
+ PRID_REV_R4400) {
+ c->cputype = CPU_R4400PC;
+ __cpu_name[cpu] = "R4400PC";
+ } else {
+ c->cputype = CPU_R4000PC;
+ __cpu_name[cpu] = "R4000PC";
+ }
+ } else {
+ int cca = read_c0_config() & CONF_CM_CMASK;
+ int mc;
+
+ /*
+ * SC and MC versions can't be reliably told apart,
+ * but only the latter support coherent caching
+ * modes so assume the firmware has set the KSEG0
+ * coherency attribute reasonably (if uncached, we
+ * assume SC).
+ */
+ switch (cca) {
+ case CONF_CM_CACHABLE_CE:
+ case CONF_CM_CACHABLE_COW:
+ case CONF_CM_CACHABLE_CUW:
+ mc = 1;
+ break;
+ default:
+ mc = 0;
+ break;
+ }
+ if ((c->processor_id & PRID_REV_MASK) >=
+ PRID_REV_R4400) {
+ c->cputype = mc ? CPU_R4400MC : CPU_R4400SC;
+ __cpu_name[cpu] = mc ? "R4400MC" : "R4400SC";
+ } else {
+ c->cputype = mc ? CPU_R4000MC : CPU_R4000SC;
+ __cpu_name[cpu] = mc ? "R4000MC" : "R4000SC";
+ }
+ }
+
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_WATCH | MIPS_CPU_VCE |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R4300:
+ c->cputype = CPU_R4300;
+ __cpu_name[cpu] = "R4300";
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 32;
+ break;
+ case PRID_IMP_R4600:
+ c->cputype = CPU_R4600;
+ __cpu_name[cpu] = "R4600";
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ #if 0
+ case PRID_IMP_R4650:
+ /*
+ * This processor doesn't have an MMU, so it's not
+ * "real easy" to run Linux on it. It is left purely
+ * for documentation. Commented out because it shares
+ * it's c0_prid id number with the TX3900.
+ */
+ c->cputype = CPU_R4650;
+ __cpu_name[cpu] = "R4650";
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ #endif
+ case PRID_IMP_R4700:
+ c->cputype = CPU_R4700;
+ __cpu_name[cpu] = "R4700";
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_TX49:
+ c->cputype = CPU_TX49XX;
+ __cpu_name[cpu] = "R49XX";
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ c->options = R4K_OPTS | MIPS_CPU_LLSC;
+ if (!(c->processor_id & 0x08))
+ c->options |= MIPS_CPU_FPU | MIPS_CPU_32FPR;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R5000:
+ c->cputype = CPU_R5000;
+ __cpu_name[cpu] = "R5000";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_R5500:
+ c->cputype = CPU_R5500;
+ __cpu_name[cpu] = "R5500";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_WATCH | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_NEVADA:
+ c->cputype = CPU_NEVADA;
+ __cpu_name[cpu] = "Nevada";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
+ c->tlbsize = 48;
+ break;
+ case PRID_IMP_RM7000:
+ c->cputype = CPU_RM7000;
+ __cpu_name[cpu] = "RM7000";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_LLSC;
+ /*
+ * Undocumented RM7000: Bit 29 in the info register of
+ * the RM7000 v2.0 indicates if the TLB has 48 or 64
+ * entries.
+ *
+ * 29 1 => 64 entry JTLB
+ * 0 => 48 entry JTLB
+ */
+ c->tlbsize = (read_c0_info() & (1 << 29)) ? 64 : 48;
+ break;
+ case PRID_IMP_R10000:
+ c->cputype = CPU_R10000;
+ __cpu_name[cpu] = "R10000";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
+ MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 64;
+ break;
+ case PRID_IMP_R12000:
+ c->cputype = CPU_R12000;
+ __cpu_name[cpu] = "R12000";
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
+ MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 64;
+ write_c0_r10k_diag(read_c0_r10k_diag() | R10K_DIAG_E_GHIST);
+ break;
+ case PRID_IMP_R14000:
+ if (((c->processor_id >> 4) & 0x0f) > 2) {
+ c->cputype = CPU_R16000;
+ __cpu_name[cpu] = "R16000";
+ } else {
+ c->cputype = CPU_R14000;
+ __cpu_name[cpu] = "R14000";
+ }
+ set_isa(c, MIPS_CPU_ISA_IV);
+ c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
+ MIPS_CPU_FPU | MIPS_CPU_32FPR |
+ MIPS_CPU_COUNTER | MIPS_CPU_WATCH |
+ MIPS_CPU_LLSC;
+ c->tlbsize = 64;
+ write_c0_r10k_diag(read_c0_r10k_diag() | R10K_DIAG_E_GHIST);
+ break;
+ case PRID_IMP_LOONGSON_64C: /* Loongson-2/3 */
+ switch (c->processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON2E:
+ c->cputype = CPU_LOONGSON2EF;
+ __cpu_name[cpu] = "ICT Loongson-2";
+ set_elf_platform(cpu, "loongson2e");
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ break;
+ case PRID_REV_LOONGSON2F:
+ c->cputype = CPU_LOONGSON2EF;
+ __cpu_name[cpu] = "ICT Loongson-2";
+ set_elf_platform(cpu, "loongson2f");
+ set_isa(c, MIPS_CPU_ISA_III);
+ c->fpu_msk31 |= FPU_CSR_CONDX;
+ break;
+ case PRID_REV_LOONGSON3A_R1:
+ c->cputype = CPU_LOONGSON64;
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3a");
+ set_isa(c, MIPS_CPU_ISA_M64R1);
+ c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
+ MIPS_ASE_LOONGSON_EXT);
+ break;
+ case PRID_REV_LOONGSON3B_R1:
+ case PRID_REV_LOONGSON3B_R2:
+ c->cputype = CPU_LOONGSON64;
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3b");
+ set_isa(c, MIPS_CPU_ISA_M64R1);
+ c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
+ MIPS_ASE_LOONGSON_EXT);
+ break;
+ }
+
+ c->options = R4K_OPTS |
+ MIPS_CPU_FPU | MIPS_CPU_LLSC |
+ MIPS_CPU_32FPR;
+ c->tlbsize = 64;
+ set_cpu_asid_mask(c, MIPS_ENTRYHI_ASID);
+ c->writecombine = _CACHE_UNCACHED_ACCELERATED;
+ break;
+ case PRID_IMP_LOONGSON_32: /* Loongson-1 */
+ decode_configs(c);
+
+ c->cputype = CPU_LOONGSON32;
+
+ switch (c->processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON1B:
+ __cpu_name[cpu] = "Loongson 1B";
+ break;
+ }
+
+ break;
+ }
+}
+
+static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ c->writecombine = _CACHE_UNCACHED_ACCELERATED;
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_QEMU_GENERIC:
+ c->writecombine = _CACHE_UNCACHED;
+ c->cputype = CPU_QEMU_GENERIC;
+ __cpu_name[cpu] = "MIPS GENERIC QEMU";
+ break;
+ case PRID_IMP_4KC:
+ c->cputype = CPU_4KC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 4Kc";
+ break;
+ case PRID_IMP_4KEC:
+ case PRID_IMP_4KECR2:
+ c->cputype = CPU_4KEC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 4KEc";
+ break;
+ case PRID_IMP_4KSC:
+ case PRID_IMP_4KSD:
+ c->cputype = CPU_4KSC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 4KSc";
+ break;
+ case PRID_IMP_5KC:
+ c->cputype = CPU_5KC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 5Kc";
+ break;
+ case PRID_IMP_5KE:
+ c->cputype = CPU_5KE;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 5KE";
+ break;
+ case PRID_IMP_20KC:
+ c->cputype = CPU_20KC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 20Kc";
+ break;
+ case PRID_IMP_24K:
+ c->cputype = CPU_24K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 24Kc";
+ break;
+ case PRID_IMP_24KE:
+ c->cputype = CPU_24K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 24KEc";
+ break;
+ case PRID_IMP_25KF:
+ c->cputype = CPU_25KF;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 25Kc";
+ break;
+ case PRID_IMP_34K:
+ c->cputype = CPU_34K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 34Kc";
+ cpu_set_mt_per_tc_perf(c);
+ break;
+ case PRID_IMP_74K:
+ c->cputype = CPU_74K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 74Kc";
+ break;
+ case PRID_IMP_M14KC:
+ c->cputype = CPU_M14KC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS M14Kc";
+ break;
+ case PRID_IMP_M14KEC:
+ c->cputype = CPU_M14KEC;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS M14KEc";
+ break;
+ case PRID_IMP_1004K:
+ c->cputype = CPU_1004K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 1004Kc";
+ cpu_set_mt_per_tc_perf(c);
+ break;
+ case PRID_IMP_1074K:
+ c->cputype = CPU_1074K;
+ c->writecombine = _CACHE_UNCACHED;
+ __cpu_name[cpu] = "MIPS 1074Kc";
+ break;
+ case PRID_IMP_INTERAPTIV_UP:
+ c->cputype = CPU_INTERAPTIV;
+ __cpu_name[cpu] = "MIPS interAptiv";
+ cpu_set_mt_per_tc_perf(c);
+ break;
+ case PRID_IMP_INTERAPTIV_MP:
+ c->cputype = CPU_INTERAPTIV;
+ __cpu_name[cpu] = "MIPS interAptiv (multi)";
+ cpu_set_mt_per_tc_perf(c);
+ break;
+ case PRID_IMP_PROAPTIV_UP:
+ c->cputype = CPU_PROAPTIV;
+ __cpu_name[cpu] = "MIPS proAptiv";
+ break;
+ case PRID_IMP_PROAPTIV_MP:
+ c->cputype = CPU_PROAPTIV;
+ __cpu_name[cpu] = "MIPS proAptiv (multi)";
+ break;
+ case PRID_IMP_P5600:
+ c->cputype = CPU_P5600;
+ __cpu_name[cpu] = "MIPS P5600";
+ break;
+ case PRID_IMP_P6600:
+ c->cputype = CPU_P6600;
+ __cpu_name[cpu] = "MIPS P6600";
+ break;
+ case PRID_IMP_I6400:
+ c->cputype = CPU_I6400;
+ __cpu_name[cpu] = "MIPS I6400";
+ break;
+ case PRID_IMP_I6500:
+ c->cputype = CPU_I6500;
+ __cpu_name[cpu] = "MIPS I6500";
+ break;
+ case PRID_IMP_M5150:
+ c->cputype = CPU_M5150;
+ __cpu_name[cpu] = "MIPS M5150";
+ break;
+ case PRID_IMP_M6250:
+ c->cputype = CPU_M6250;
+ __cpu_name[cpu] = "MIPS M6250";
+ break;
+ }
+
+ decode_configs(c);
+
+ spram_config();
+
+ mm_config(c);
+
+ switch (__get_cpu_type(c->cputype)) {
+ case CPU_M5150:
+ case CPU_P5600:
+ set_isa(c, MIPS_CPU_ISA_M32R5);
+ break;
+ case CPU_I6500:
+ c->options |= MIPS_CPU_SHARED_FTLB_ENTRIES;
+ fallthrough;
+ case CPU_I6400:
+ c->options |= MIPS_CPU_SHARED_FTLB_RAM;
+ fallthrough;
+ default:
+ break;
+ }
+
+ /* Recent MIPS cores use the implementation-dependent ExcCode 16 for
+ * cache/FTLB parity exceptions.
+ */
+ switch (__get_cpu_type(c->cputype)) {
+ case CPU_PROAPTIV:
+ case CPU_P5600:
+ case CPU_P6600:
+ case CPU_I6400:
+ case CPU_I6500:
+ c->options |= MIPS_CPU_FTLBPAREX;
+ break;
+ }
+}
+
+static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_AU1_REV1:
+ case PRID_IMP_AU1_REV2:
+ c->cputype = CPU_ALCHEMY;
+ switch ((c->processor_id >> 24) & 0xff) {
+ case 0:
+ __cpu_name[cpu] = "Au1000";
+ break;
+ case 1:
+ __cpu_name[cpu] = "Au1500";
+ break;
+ case 2:
+ __cpu_name[cpu] = "Au1100";
+ break;
+ case 3:
+ __cpu_name[cpu] = "Au1550";
+ break;
+ case 4:
+ __cpu_name[cpu] = "Au1200";
+ if ((c->processor_id & PRID_REV_MASK) == 2)
+ __cpu_name[cpu] = "Au1250";
+ break;
+ case 5:
+ __cpu_name[cpu] = "Au1210";
+ break;
+ default:
+ __cpu_name[cpu] = "Au1xxx";
+ break;
+ }
+ break;
+ case PRID_IMP_NETLOGIC_AU13XX:
+ c->cputype = CPU_ALCHEMY;
+ __cpu_name[cpu] = "Au1300";
+ break;
+ }
+}
+
+static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+
+ c->writecombine = _CACHE_UNCACHED_ACCELERATED;
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_SB1:
+ c->cputype = CPU_SB1;
+ __cpu_name[cpu] = "SiByte SB1";
+ /* FPU in pass1 is known to have issues. */
+ if ((c->processor_id & PRID_REV_MASK) < 0x02)
+ c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
+ break;
+ case PRID_IMP_SB1A:
+ c->cputype = CPU_SB1A;
+ __cpu_name[cpu] = "SiByte SB1A";
+ break;
+ }
+}
+
+static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_SR71000:
+ c->cputype = CPU_SR71000;
+ __cpu_name[cpu] = "Sandcraft SR71000";
+ c->scache.ways = 8;
+ c->tlbsize = 64;
+ break;
+ }
+}
+
+static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_PR4450:
+ c->cputype = CPU_PR4450;
+ __cpu_name[cpu] = "Philips PR4450";
+ set_isa(c, MIPS_CPU_ISA_M32R1);
+ break;
+ }
+}
+
+static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_BMIPS32_REV4:
+ case PRID_IMP_BMIPS32_REV8:
+ c->cputype = CPU_BMIPS32;
+ __cpu_name[cpu] = "Broadcom BMIPS32";
+ set_elf_platform(cpu, "bmips32");
+ break;
+ case PRID_IMP_BMIPS3300:
+ case PRID_IMP_BMIPS3300_ALT:
+ case PRID_IMP_BMIPS3300_BUG:
+ c->cputype = CPU_BMIPS3300;
+ __cpu_name[cpu] = "Broadcom BMIPS3300";
+ set_elf_platform(cpu, "bmips3300");
+ reserve_exception_space(0x400, VECTORSPACING * 64);
+ break;
+ case PRID_IMP_BMIPS43XX: {
+ int rev = c->processor_id & PRID_REV_MASK;
+
+ if (rev >= PRID_REV_BMIPS4380_LO &&
+ rev <= PRID_REV_BMIPS4380_HI) {
+ c->cputype = CPU_BMIPS4380;
+ __cpu_name[cpu] = "Broadcom BMIPS4380";
+ set_elf_platform(cpu, "bmips4380");
+ c->options |= MIPS_CPU_RIXI;
+ reserve_exception_space(0x400, VECTORSPACING * 64);
+ } else {
+ c->cputype = CPU_BMIPS4350;
+ __cpu_name[cpu] = "Broadcom BMIPS4350";
+ set_elf_platform(cpu, "bmips4350");
+ }
+ break;
+ }
+ case PRID_IMP_BMIPS5000:
+ case PRID_IMP_BMIPS5200:
+ c->cputype = CPU_BMIPS5000;
+ if ((c->processor_id & PRID_IMP_MASK) == PRID_IMP_BMIPS5200)
+ __cpu_name[cpu] = "Broadcom BMIPS5200";
+ else
+ __cpu_name[cpu] = "Broadcom BMIPS5000";
+ set_elf_platform(cpu, "bmips5000");
+ c->options |= MIPS_CPU_ULRI | MIPS_CPU_RIXI;
+ reserve_exception_space(0x1000, VECTORSPACING * 64);
+ break;
+ }
+}
+
+static inline void cpu_probe_cavium(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+ /* Octeon has different cache interface */
+ c->options &= ~MIPS_CPU_4K_CACHE;
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_CAVIUM_CN38XX:
+ case PRID_IMP_CAVIUM_CN31XX:
+ case PRID_IMP_CAVIUM_CN30XX:
+ c->cputype = CPU_CAVIUM_OCTEON;
+ __cpu_name[cpu] = "Cavium Octeon";
+ goto platform;
+ case PRID_IMP_CAVIUM_CN58XX:
+ case PRID_IMP_CAVIUM_CN56XX:
+ case PRID_IMP_CAVIUM_CN50XX:
+ case PRID_IMP_CAVIUM_CN52XX:
+ c->cputype = CPU_CAVIUM_OCTEON_PLUS;
+ __cpu_name[cpu] = "Cavium Octeon+";
+platform:
+ set_elf_platform(cpu, "octeon");
+ break;
+ case PRID_IMP_CAVIUM_CN61XX:
+ case PRID_IMP_CAVIUM_CN63XX:
+ case PRID_IMP_CAVIUM_CN66XX:
+ case PRID_IMP_CAVIUM_CN68XX:
+ case PRID_IMP_CAVIUM_CNF71XX:
+ c->cputype = CPU_CAVIUM_OCTEON2;
+ __cpu_name[cpu] = "Cavium Octeon II";
+ set_elf_platform(cpu, "octeon2");
+ break;
+ case PRID_IMP_CAVIUM_CN70XX:
+ case PRID_IMP_CAVIUM_CN73XX:
+ case PRID_IMP_CAVIUM_CNF75XX:
+ case PRID_IMP_CAVIUM_CN78XX:
+ c->cputype = CPU_CAVIUM_OCTEON3;
+ __cpu_name[cpu] = "Cavium Octeon III";
+ set_elf_platform(cpu, "octeon3");
+ break;
+ default:
+ printk(KERN_INFO "Unknown Octeon chip!\n");
+ c->cputype = CPU_UNKNOWN;
+ break;
+ }
+}
+
+#ifdef CONFIG_CPU_LOONGSON64
+#include <loongson_regs.h>
+
+static inline void decode_cpucfg(struct cpuinfo_mips *c)
+{
+ u32 cfg1 = read_cpucfg(LOONGSON_CFG1);
+ u32 cfg2 = read_cpucfg(LOONGSON_CFG2);
+ u32 cfg3 = read_cpucfg(LOONGSON_CFG3);
+
+ if (cfg1 & LOONGSON_CFG1_MMI)
+ c->ases |= MIPS_ASE_LOONGSON_MMI;
+
+ if (cfg2 & LOONGSON_CFG2_LEXT1)
+ c->ases |= MIPS_ASE_LOONGSON_EXT;
+
+ if (cfg2 & LOONGSON_CFG2_LEXT2)
+ c->ases |= MIPS_ASE_LOONGSON_EXT2;
+
+ if (cfg2 & LOONGSON_CFG2_LSPW) {
+ c->options |= MIPS_CPU_LDPTE;
+ c->guest.options |= MIPS_CPU_LDPTE;
+ }
+
+ if (cfg3 & LOONGSON_CFG3_LCAMP)
+ c->ases |= MIPS_ASE_LOONGSON_CAM;
+}
+
+static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ c->cputype = CPU_LOONGSON64;
+
+ /* All Loongson processors covered here define ExcCode 16 as GSExc. */
+ decode_configs(c);
+ c->options |= MIPS_CPU_GSEXCEX;
+
+ switch (c->processor_id & PRID_IMP_MASK) {
+ case PRID_IMP_LOONGSON_64R: /* Loongson-64 Reduced */
+ switch (c->processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON2K_R1_0:
+ case PRID_REV_LOONGSON2K_R1_1:
+ case PRID_REV_LOONGSON2K_R1_2:
+ case PRID_REV_LOONGSON2K_R1_3:
+ __cpu_name[cpu] = "Loongson-2K";
+ set_elf_platform(cpu, "gs264e");
+ set_isa(c, MIPS_CPU_ISA_M64R2);
+ break;
+ }
+ c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_EXT |
+ MIPS_ASE_LOONGSON_EXT2);
+ break;
+ case PRID_IMP_LOONGSON_64C: /* Loongson-3 Classic */
+ switch (c->processor_id & PRID_REV_MASK) {
+ case PRID_REV_LOONGSON3A_R2_0:
+ case PRID_REV_LOONGSON3A_R2_1:
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3a");
+ set_isa(c, MIPS_CPU_ISA_M64R2);
+ break;
+ case PRID_REV_LOONGSON3A_R3_0:
+ case PRID_REV_LOONGSON3A_R3_1:
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3a");
+ set_isa(c, MIPS_CPU_ISA_M64R2);
+ break;
+ }
+ /*
+ * Loongson-3 Classic did not implement MIPS standard TLBINV
+ * but implemented TLBINVF and EHINV. As currently we're only
+ * using these two features, enable MIPS_CPU_TLBINV as well.
+ *
+ * Also some early Loongson-3A2000 had wrong TLB type in Config
+ * register, we correct it here.
+ */
+ c->options |= MIPS_CPU_FTLB | MIPS_CPU_TLBINV | MIPS_CPU_LDPTE;
+ c->ases |= (MIPS_ASE_LOONGSON_MMI | MIPS_ASE_LOONGSON_CAM |
+ MIPS_ASE_LOONGSON_EXT | MIPS_ASE_LOONGSON_EXT2);
+ c->ases &= ~MIPS_ASE_VZ; /* VZ of Loongson-3A2000/3000 is incomplete */
+ break;
+ case PRID_IMP_LOONGSON_64G:
+ __cpu_name[cpu] = "ICT Loongson-3";
+ set_elf_platform(cpu, "loongson3a");
+ set_isa(c, MIPS_CPU_ISA_M64R2);
+ decode_cpucfg(c);
+ break;
+ default:
+ panic("Unknown Loongson Processor ID!");
+ break;
+ }
+}
+#else
+static inline void cpu_probe_loongson(struct cpuinfo_mips *c, unsigned int cpu) { }
+#endif
+
+static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu)
+{
+ decode_configs(c);
+
+ /*
+ * XBurst misses a config2 register, so config3 decode was skipped in
+ * decode_configs().
+ */
+ decode_config3(c);
+
+ /* XBurst does not implement the CP0 counter. */
+ c->options &= ~MIPS_CPU_COUNTER;
+ BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter);
+
+ /* XBurst has virtually tagged icache */
+ c->icache.flags |= MIPS_CACHE_VTAG;
+
+ switch (c->processor_id & PRID_IMP_MASK) {
+
+ /* XBurst®1 with MXU1.0/MXU1.1 SIMD ISA */
+ case PRID_IMP_XBURST_REV1:
+
+ /*
+ * The XBurst core by default attempts to avoid branch target
+ * buffer lookups by detecting & special casing loops. This
+ * feature will cause BogoMIPS and lpj calculate in error.
+ * Set cp0 config7 bit 4 to disable this feature.
+ */
+ set_c0_config7(MIPS_CONF7_BTB_LOOP_EN);
+
+ switch (c->processor_id & PRID_COMP_MASK) {
+
+ /*
+ * The config0 register in the XBurst CPUs with a processor ID of
+ * PRID_COMP_INGENIC_D0 report themselves as MIPS32r2 compatible,
+ * but they don't actually support this ISA.
+ */
+ case PRID_COMP_INGENIC_D0:
+ c->isa_level &= ~MIPS_CPU_ISA_M32R2;
+
+ /* FPU is not properly detected on JZ4760(B). */
+ if (c->processor_id == 0x2ed0024f)
+ c->options |= MIPS_CPU_FPU;
+
+ fallthrough;
+
+ /*
+ * The config0 register in the XBurst CPUs with a processor ID of
+ * PRID_COMP_INGENIC_D0 or PRID_COMP_INGENIC_D1 has an abandoned
+ * huge page tlb mode, this mode is not compatible with the MIPS
+ * standard, it will cause tlbmiss and into an infinite loop
+ * (line 21 in the tlb-funcs.S) when starting the init process.
+ * After chip reset, the default is HPTLB mode, Write 0xa9000000
+ * to cp0 register 5 sel 4 to switch back to VTLB mode to prevent
+ * getting stuck.
+ */
+ case PRID_COMP_INGENIC_D1:
+ write_c0_page_ctrl(XBURST_PAGECTRL_HPTLB_DIS);
+ break;
+
+ default:
+ break;
+ }
+ fallthrough;
+
+ /* XBurst®1 with MXU2.0 SIMD ISA */
+ case PRID_IMP_XBURST_REV2:
+ /* Ingenic uses the WA bit to achieve write-combine memory writes */
+ c->writecombine = _CACHE_CACHABLE_WA;
+ c->cputype = CPU_XBURST;
+ __cpu_name[cpu] = "Ingenic XBurst";
+ break;
+
+ /* XBurst®2 with MXU2.1 SIMD ISA */
+ case PRID_IMP_XBURST2:
+ c->cputype = CPU_XBURST;
+ __cpu_name[cpu] = "Ingenic XBurst II";
+ break;
+
+ default:
+ panic("Unknown Ingenic Processor ID!");
+ break;
+ }
+}
+
+#ifdef CONFIG_64BIT
+/* For use by uaccess.h */
+u64 __ua_limit;
+EXPORT_SYMBOL(__ua_limit);
+#endif
+
+const char *__cpu_name[NR_CPUS];
+const char *__elf_platform;
+const char *__elf_base_platform;
+
+void cpu_probe(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+ unsigned int cpu = smp_processor_id();
+
+ /*
+ * Set a default elf platform, cpu probe may later
+ * overwrite it with a more precise value
+ */
+ set_elf_platform(cpu, "mips");
+
+ c->processor_id = PRID_IMP_UNKNOWN;
+ c->fpu_id = FPIR_IMP_NONE;
+ c->cputype = CPU_UNKNOWN;
+ c->writecombine = _CACHE_UNCACHED;
+
+ c->fpu_csr31 = FPU_CSR_RN;
+ c->fpu_msk31 = FPU_CSR_RSVD | FPU_CSR_ABS2008 | FPU_CSR_NAN2008;
+
+ c->processor_id = read_c0_prid();
+ switch (c->processor_id & PRID_COMP_MASK) {
+ case PRID_COMP_LEGACY:
+ cpu_probe_legacy(c, cpu);
+ break;
+ case PRID_COMP_MIPS:
+ cpu_probe_mips(c, cpu);
+ break;
+ case PRID_COMP_ALCHEMY:
+ case PRID_COMP_NETLOGIC:
+ cpu_probe_alchemy(c, cpu);
+ break;
+ case PRID_COMP_SIBYTE:
+ cpu_probe_sibyte(c, cpu);
+ break;
+ case PRID_COMP_BROADCOM:
+ cpu_probe_broadcom(c, cpu);
+ break;
+ case PRID_COMP_SANDCRAFT:
+ cpu_probe_sandcraft(c, cpu);
+ break;
+ case PRID_COMP_NXP:
+ cpu_probe_nxp(c, cpu);
+ break;
+ case PRID_COMP_CAVIUM:
+ cpu_probe_cavium(c, cpu);
+ break;
+ case PRID_COMP_LOONGSON:
+ cpu_probe_loongson(c, cpu);
+ break;
+ case PRID_COMP_INGENIC_13:
+ case PRID_COMP_INGENIC_D0:
+ case PRID_COMP_INGENIC_D1:
+ case PRID_COMP_INGENIC_E1:
+ cpu_probe_ingenic(c, cpu);
+ break;
+ }
+
+ BUG_ON(!__cpu_name[cpu]);
+ BUG_ON(c->cputype == CPU_UNKNOWN);
+
+ /*
+ * Platform code can force the cpu type to optimize code
+ * generation. In that case be sure the cpu type is correctly
+ * manually setup otherwise it could trigger some nasty bugs.
+ */
+ BUG_ON(current_cpu_type() != c->cputype);
+
+ if (cpu_has_rixi) {
+ /* Enable the RIXI exceptions */
+ set_c0_pagegrain(PG_IEC);
+ back_to_back_c0_hazard();
+ /* Verify the IEC bit is set */
+ if (read_c0_pagegrain() & PG_IEC)
+ c->options |= MIPS_CPU_RIXIEX;
+ }
+
+ if (mips_fpu_disabled)
+ c->options &= ~MIPS_CPU_FPU;
+
+ if (mips_dsp_disabled)
+ c->ases &= ~(MIPS_ASE_DSP | MIPS_ASE_DSP2P);
+
+ if (mips_htw_disabled) {
+ c->options &= ~MIPS_CPU_HTW;
+ write_c0_pwctl(read_c0_pwctl() &
+ ~(1 << MIPS_PWCTL_PWEN_SHIFT));
+ }
+
+ if (c->options & MIPS_CPU_FPU)
+ cpu_set_fpu_opts(c);
+ else
+ cpu_set_nofpu_opts(c);
+
+ if (cpu_has_mips_r2_r6) {
+ c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
+ /* R2 has Performance Counter Interrupt indicator */
+ c->options |= MIPS_CPU_PCI;
+ }
+ else
+ c->srsets = 1;
+
+ if (cpu_has_mips_r6)
+ elf_hwcap |= HWCAP_MIPS_R6;
+
+ if (cpu_has_msa) {
+ c->msa_id = cpu_get_msa_id();
+ WARN(c->msa_id & MSA_IR_WRPF,
+ "Vector register partitioning unimplemented!");
+ elf_hwcap |= HWCAP_MIPS_MSA;
+ }
+
+ if (cpu_has_mips16)
+ elf_hwcap |= HWCAP_MIPS_MIPS16;
+
+ if (cpu_has_mdmx)
+ elf_hwcap |= HWCAP_MIPS_MDMX;
+
+ if (cpu_has_mips3d)
+ elf_hwcap |= HWCAP_MIPS_MIPS3D;
+
+ if (cpu_has_smartmips)
+ elf_hwcap |= HWCAP_MIPS_SMARTMIPS;
+
+ if (cpu_has_dsp)
+ elf_hwcap |= HWCAP_MIPS_DSP;
+
+ if (cpu_has_dsp2)
+ elf_hwcap |= HWCAP_MIPS_DSP2;
+
+ if (cpu_has_dsp3)
+ elf_hwcap |= HWCAP_MIPS_DSP3;
+
+ if (cpu_has_mips16e2)
+ elf_hwcap |= HWCAP_MIPS_MIPS16E2;
+
+ if (cpu_has_loongson_mmi)
+ elf_hwcap |= HWCAP_LOONGSON_MMI;
+
+ if (cpu_has_loongson_ext)
+ elf_hwcap |= HWCAP_LOONGSON_EXT;
+
+ if (cpu_has_loongson_ext2)
+ elf_hwcap |= HWCAP_LOONGSON_EXT2;
+
+ if (cpu_has_vz)
+ cpu_probe_vz(c);
+
+ cpu_probe_vmbits(c);
+
+ /* Synthesize CPUCFG data if running on Loongson processors;
+ * no-op otherwise.
+ *
+ * This looks at previously probed features, so keep this at bottom.
+ */
+ loongson3_cpucfg_synthesize_data(c);
+
+#ifdef CONFIG_64BIT
+ if (cpu == 0)
+ __ua_limit = ~((1ull << cpu_vmbits) - 1);
+#endif
+
+ reserve_exception_space(0, 0x1000);
+}
+
+void cpu_report(void)
+{
+ struct cpuinfo_mips *c = &current_cpu_data;
+
+ pr_info("CPU%d revision is: %08x (%s)\n",
+ smp_processor_id(), c->processor_id, cpu_name_string());
+ if (c->options & MIPS_CPU_FPU)
+ printk(KERN_INFO "FPU revision is: %08x\n", c->fpu_id);
+ if (cpu_has_msa)
+ pr_info("MSA revision is: %08x\n", c->msa_id);
+}
+
+void cpu_set_cluster(struct cpuinfo_mips *cpuinfo, unsigned int cluster)
+{
+ /* Ensure the core number fits in the field */
+ WARN_ON(cluster > (MIPS_GLOBALNUMBER_CLUSTER >>
+ MIPS_GLOBALNUMBER_CLUSTER_SHF));
+
+ cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CLUSTER;
+ cpuinfo->globalnumber |= cluster << MIPS_GLOBALNUMBER_CLUSTER_SHF;
+}
+
+void cpu_set_core(struct cpuinfo_mips *cpuinfo, unsigned int core)
+{
+ /* Ensure the core number fits in the field */
+ WARN_ON(core > (MIPS_GLOBALNUMBER_CORE >> MIPS_GLOBALNUMBER_CORE_SHF));
+
+ cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_CORE;
+ cpuinfo->globalnumber |= core << MIPS_GLOBALNUMBER_CORE_SHF;
+}
+
+void cpu_set_vpe_id(struct cpuinfo_mips *cpuinfo, unsigned int vpe)
+{
+ /* Ensure the VP(E) ID fits in the field */
+ WARN_ON(vpe > (MIPS_GLOBALNUMBER_VP >> MIPS_GLOBALNUMBER_VP_SHF));
+
+ /* Ensure we're not using VP(E)s without support */
+ WARN_ON(vpe && !IS_ENABLED(CONFIG_MIPS_MT_SMP) &&
+ !IS_ENABLED(CONFIG_CPU_MIPSR6));
+
+ cpuinfo->globalnumber &= ~MIPS_GLOBALNUMBER_VP;
+ cpuinfo->globalnumber |= vpe << MIPS_GLOBALNUMBER_VP_SHF;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 20:00:58 +0000