linux-user: Implement /proc/cpuinfo for loongarch cpus
Mimic the entries for /proc/cpuinfo to what can be seen on the debian porterbox loomis.debian.org. Cc: Song Gao <gaosong@loongson.cn> Cc: Bibo Mao <maobibo@loongson.cn> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller committed
Jun 16, 2026 at 21:31 UTC
13956e82449a5181df7454bc705df17abb83e863
2 files changed
+98
-1
linux-user/loongarch64/elfload.c
+20
@@ -28,6 +28,26 @@ enum {
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HWCAP_LOONGARCH_LBT_MIPS = (1 << 12),
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};
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+const char *elf_hwcap_str(uint32_t bit)
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+{
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+ static const char *hwcap_str[] = {
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+ [__builtin_ctz(HWCAP_LOONGARCH_CPUCFG )] = "cpucfg",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LAM )] = "lam",
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+ [__builtin_ctz(HWCAP_LOONGARCH_UAL )] = "lam_bh",
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+ [__builtin_ctz(HWCAP_LOONGARCH_FPU )] = "fpu",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LSX )] = "lsx",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LASX )] = "lasx",
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+ [__builtin_ctz(HWCAP_LOONGARCH_CRC32 )] = "crc32",
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+ [__builtin_ctz(HWCAP_LOONGARCH_COMPLEX )] = "complex",
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+ [__builtin_ctz(HWCAP_LOONGARCH_CRYPTO )] = "crypto",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LVZ )] = "lvz",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LBT_X86 )] = "lbt_x86",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LBT_ARM )] = "lbt_arm",
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+ [__builtin_ctz(HWCAP_LOONGARCH_LBT_MIPS)] = "lbt_mips",
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+ };
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+
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+ return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
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+}
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abi_ulong get_elf_hwcap(CPUState *cs)
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{
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LoongArchCPU *cpu = LOONGARCH_CPU(cs);
linux-user/loongarch64/target_proc.h
+78
-1
@@ -1 +1,78 @@
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-/* No target-specific /proc support */
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+/*
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+ * Loongson specific proc functions for linux-user
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+ *
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+ * Copyright (c) 2026 Helge Deller
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+ *
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+ * SPDX-License-Identifier: GPL-2.0-or-later
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+ */
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+#ifndef LOONGARCH_TARGET_PROC_H
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+#define LOONGARCH_TARGET_PROC_H
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+
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+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
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+{
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+ uint32_t elf_hwcap = get_elf_hwcap(env_cpu(cpu_env));
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+ uint32_t prid, ser_id, pabits, vabits, i, n, num_cpus;
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+ bool is_64bit = is_la64(cpu_env);
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+ const char *hwcap_str;
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+ struct timespec res;
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+ double freq_mhz;
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+
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+#if TARGET_LONG_BITS == 32
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+ pabits = 31;
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+ vabits = 31;
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+#else
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+ pabits = FIELD_EX32(cpu_env->cpucfg[1], CPUCFG1, PALEN);
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+ vabits = FIELD_EX32(cpu_env->cpucfg[1], CPUCFG1, VALEN);
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+#endif
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+
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+ if (clock_getres(CLOCK_REALTIME, &res) == -1) {
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+ res.tv_nsec = 1;
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+ }
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+ freq_mhz = 1000.0 / res.tv_nsec;
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+
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+ ser_id = FIELD_EX32(cpu_env->cpucfg[0], CPUCFG0, SERID);
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+ prid = FIELD_EX32(cpu_env->cpucfg[0], CPUCFG0, PRID);
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+
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+ dprintf(fd, "system type\t\t: generic-loongson-machine\n");
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+
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+ num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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+ for (n = 0; n < num_cpus; n++) {
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+ dprintf(fd, "\nprocessor\t\t: %d\n", n);
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+ dprintf(fd, "package\t\t\t: 0\n");
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+ dprintf(fd, "core\t\t\t: %d\n", n);
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+ dprintf(fd, "global_id\t\t: %d\n", n);
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+ dprintf(fd, "CPU Family\t\t: Loongson-%dbit\n", is_64bit ? 64 : 32);
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+ dprintf(fd, "Model Name\t\t: QEMU_user-v" QEMU_VERSION "\n");
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+ dprintf(fd, "PRID\t\t\t: %s (%08x)\n",
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+ ser_id == PRID_SERIES_LA464 ? "LA464" :
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+ ser_id == PRID_SERIES_LA132 ? "LA132" : "Unknown",
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+ cpu_env->cpucfg[0]);
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+ dprintf(fd, "CPU Revision\t\t: 0x%02x\n", prid);
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+ dprintf(fd, "FPU Revision\t\t: 0x%02x\n",
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+ FIELD_EX32(cpu_env->cpucfg[2], CPUCFG2, FP_VER));
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+ dprintf(fd, "CPU MHz\t\t\t: %.2f\n", freq_mhz);
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+ dprintf(fd, "Address Sizes\t\t: %d bits physical, %d bits virtual\n",
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+ pabits + 1, vabits + 1);
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+
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+ dprintf(fd, "ISA\t\t\t:%s", " loongarch32r loongarch32s");
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+ if (is_64bit) {
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+ dprintf(fd, " loongarch64");
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+ }
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+
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+ dprintf(fd, "\nFeatures\t\t:");
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+ for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
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+ if (!(elf_hwcap & (1 << i))) {
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+ continue;
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+ }
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+ hwcap_str = elf_hwcap_str(i);
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+ if (hwcap_str) {
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+ dprintf(fd, " %s", hwcap_str);
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+ }
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+ }
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+ dprintf(fd, "\nHardware Watchpoint\t: no\n");
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+ }
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+ return 0;
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+}
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+#define HAVE_ARCH_PROC_CPUINFO
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+
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+#endif /* LOONGARCH_TARGET_PROC_H */