procfs：add armv8-m cpuinfo

Signed-off-by: liaoao <liaoao@xiaomi.com>

arch/arm/Kconfig

@@ -853,6 +853,7 @@ config ARCH_CORTEXR7
 config ARCH_ARMV8M
 	bool
 	default n
+	select ARCH_HAVE_CPUINFO
 
 config ARCH_CORTEXM23
 	bool

arch/arm/src/armv8-m/Make.defs

@@ -24,7 +24,7 @@ include common/Make.defs
 
 CMN_ASRCS += arm_exception.S arm_saveusercontext.S
 
-CMN_CSRCS += arm_busfault.c arm_cache.c arm_doirq.c
+CMN_CSRCS += arm_busfault.c arm_cache.c arm_cpuinfo.c arm_doirq.c
 CMN_CSRCS += arm_hardfault.c arm_initialstate.c arm_itm.c
 CMN_CSRCS += arm_memfault.c arm_perf.c arm_sau.c
 CMN_CSRCS += arm_schedulesigaction.c arm_securefault.c arm_secure_irq.c

arch/arm/src/armv8-m/arm_cpuinfo.c

@@ -0,0 +1,144 @@
+/****************************************************************************
+ * arch/arm/src/armv8-m/arm_cpuinfo.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/fs/procfs.h>
+#include <nuttx/arch.h>
+
+#include "arm_internal.h"
+#include "hwcap.h"
+#include "nvic.h"
+
+#if defined(CONFIG_FS_PROCFS) && !defined(CONFIG_FS_PROCFS_EXCLUDE_CPUINFO)
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * name: hwcap_extract_field
+ ****************************************************************************/
+
+#if defined(CONFIG_ARCH_FPU)
+static int hwcap_extract_field(uint32_t features, int field)
+{
+  int feature;
+
+  feature = (features >> field) & 0xf;
+  if (feature > 7)
+    {
+      feature -= 16;
+    }
+
+  return feature;
+}
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * name: up_show_cpuinfo
+ ****************************************************************************/
+
+ssize_t up_show_cpuinfo(FAR char *buf, size_t buf_size, off_t file_off)
+{
+  int i;
+  uint32_t cpuid;
+
+  for (i = 0; i < CONFIG_SMP_NCPUS; i++)
+    {
+      procfs_sprintf(buf, buf_size, &file_off, "processor\t: %d\n", i);
+      procfs_sprintf(buf, buf_size, &file_off, "BogoMIPS\t: %u.%02u\n",
+                     (CONFIG_BOARD_LOOPSPERMSEC / 1000),
+                     (CONFIG_BOARD_LOOPSPERMSEC / 10) % 100);
+      procfs_sprintf(buf, buf_size, &file_off, "cpu MHz\t\t: %lu.%02lu\n",
+                     up_perf_getfreq() / 1000000,
+                     (up_perf_getfreq() / 10000) % 100);
+
+      /* Cpu features */
+
+      procfs_sprintf(buf, buf_size, &file_off, "Features\t:");
+      procfs_sprintf(buf, buf_size, &file_off, " %s %s %s",
+                     HWCAP_HALF, HWCAP_FAST_MULT, HWCAP_LPAE);
+
+#ifdef CONFIG_ARM_THUMB
+      procfs_sprintf(buf, buf_size, &file_off, " %s %s",
+                     HWCAP_IDIVT, HWCAP_THUMB);
+#else
+      procfs_sprintf(buf, buf_size, &file_off, " %s", HWCAP_IDIVA);
+#endif
+
+#ifdef CONFIG_ARM_DSP
+      procfs_sprintf(buf, buf_size, &file_off, " %s", HWCAP_EDSP);
+#endif
+
+#ifdef CONFIG_SCHED_THREAD_LOCAL
+      procfs_sprintf(buf, buf_size, &file_off, " %s", HWCAP_TLS);
+#endif
+
+      /* VFP features */
+
+#if defined(CONFIG_ARCH_FPU)
+# if defined(CONFIG_ARCH_CORTEXM33) || defined(CONFIG_ARCH_CORTEXM35P)
+      procfs_sprintf(buf, buf_size, &file_off, " %s %s %s",
+                     HWCAP_FPV5, HWCAP_FPSP, HWCAP_VFPV3D16);
+# elif defined(CONFIG_ARCH_CORTEXM55) || defined(CONFIG_ARCH_CORTEXM85)
+      procfs_sprintf(buf, buf_size, &file_off, " %s %s %s %s",
+                     HWCAP_FPV5, HWCAP_FPSP, HWCAP_FPDP, HWCAP_VFPV3D16);
+# endif
+
+# if defined(CONFIG_ARM_HAVE_MVE)
+      procfs_sprintf(buf, buf_size, &file_off, " %s", HWCAP_MVE);
+# endif
+
+      if (hwcap_extract_field(getreg32(NVIC_MVFR1), 20) == 1)
+        {
+          procfs_sprintf(buf, buf_size, &file_off, " %s", HWCAP_FPHP);
+        }
+#endif
+
+      /* Cpuid info */
+
+      cpuid = getreg32(NVIC_CPUID_BASE);
+      procfs_sprintf(buf, buf_size, &file_off,
+                     "\nmodel name\t: %s rev %" PRIx32 " (%s)\n"
+                     "CPU architecture: %s\n",
+                     "ARMv8-M", cpuid & 15, "v8ml", "8M");
+
+      procfs_sprintf(buf, buf_size, &file_off,
+                     "CPU implementer\t: 0x%02" PRIx32 "\n"
+                     "CPU variant\t: 0x%" PRIx32 "\n"
+                     "CPU part\t: 0x%03" PRIx32 "\n"
+                     "CPU revision\t: %" PRIu32"\n\n",
+                     cpuid >> 24,
+                     (cpuid >> 20) & 0xf,
+                     (cpuid >> 4) & 0xfff,
+                     cpuid & 0xf);
+    }
+
+  return -file_off;
+}
+#endif /* CONFIG_FS_PROCFS && !CONFIG_FS_PROCFS_EXCLUDE_CPUINFO */

arch/arm/src/common/hwcap.h

@@ -57,6 +57,7 @@
 #define HWCAP_FPSP      "fpsp"      /* Single-precision instructions support */
 #define HWCAP_FPDP      "fpdp"      /* Double-precision instructions support */
 #define HWCAP_FPV5      "fpv5"      /* Floating-point extension version */
+#define HWCAP_MVE       "mve"       /* M-profile vector extension */
 
 /* Hardware capabilities added form armv8 */