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linux-user: Implement /proc/cpuinfo for loongarch cpus

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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>
This commit is contained in:
Helge Deller
2026-06-16 21:31:42 +02:00
parent 156e536a7b
commit 13956e8244
2 changed files with 98 additions and 1 deletions
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20
linux-user/loongarch64/elfload.c
View File

@@ -28,6 +28,26 @@ enum {
HWCAP_LOONGARCH_LBT_MIPS = (1 << 12),
};
const char *elf_hwcap_str(uint32_t bit)
{
static const char *hwcap_str[] = {
[__builtin_ctz(HWCAP_LOONGARCH_CPUCFG )] = "cpucfg",
[__builtin_ctz(HWCAP_LOONGARCH_LAM )] = "lam",
[__builtin_ctz(HWCAP_LOONGARCH_UAL )] = "lam_bh",
[__builtin_ctz(HWCAP_LOONGARCH_FPU )] = "fpu",
[__builtin_ctz(HWCAP_LOONGARCH_LSX )] = "lsx",
[__builtin_ctz(HWCAP_LOONGARCH_LASX )] = "lasx",
[__builtin_ctz(HWCAP_LOONGARCH_CRC32 )] = "crc32",
[__builtin_ctz(HWCAP_LOONGARCH_COMPLEX )] = "complex",
[__builtin_ctz(HWCAP_LOONGARCH_CRYPTO )] = "crypto",
[__builtin_ctz(HWCAP_LOONGARCH_LVZ )] = "lvz",
[__builtin_ctz(HWCAP_LOONGARCH_LBT_X86 )] = "lbt_x86",
[__builtin_ctz(HWCAP_LOONGARCH_LBT_ARM )] = "lbt_arm",
[__builtin_ctz(HWCAP_LOONGARCH_LBT_MIPS)] = "lbt_mips",
};
return bit < ARRAY_SIZE(hwcap_str) ? hwcap_str[bit] : NULL;
}
abi_ulong get_elf_hwcap(CPUState *cs)
{
LoongArchCPU *cpu = LOONGARCH_CPU(cs);

79
linux-user/loongarch64/target_proc.h
View File

@@ -1 +1,78 @@
/* No target-specific /proc support */
/*
* Loongson specific proc functions for linux-user
*
* Copyright (c) 2026 Helge Deller
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef LOONGARCH_TARGET_PROC_H
#define LOONGARCH_TARGET_PROC_H
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
uint32_t elf_hwcap = get_elf_hwcap(env_cpu(cpu_env));
uint32_t prid, ser_id, pabits, vabits, i, n, num_cpus;
bool is_64bit = is_la64(cpu_env);
const char *hwcap_str;
struct timespec res;
double freq_mhz;
#if TARGET_LONG_BITS == 32
pabits = 31;
vabits = 31;
#else
pabits = FIELD_EX32(cpu_env->cpucfg[1], CPUCFG1, PALEN);
vabits = FIELD_EX32(cpu_env->cpucfg[1], CPUCFG1, VALEN);
#endif
if (clock_getres(CLOCK_REALTIME, &res) == -1) {
res.tv_nsec = 1;
}
freq_mhz = 1000.0 / res.tv_nsec;
ser_id = FIELD_EX32(cpu_env->cpucfg[0], CPUCFG0, SERID);
prid = FIELD_EX32(cpu_env->cpucfg[0], CPUCFG0, PRID);
dprintf(fd, "system type\t\t: generic-loongson-machine\n");
num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
for (n = 0; n < num_cpus; n++) {
dprintf(fd, "\nprocessor\t\t: %d\n", n);
dprintf(fd, "package\t\t\t: 0\n");
dprintf(fd, "core\t\t\t: %d\n", n);
dprintf(fd, "global_id\t\t: %d\n", n);
dprintf(fd, "CPU Family\t\t: Loongson-%dbit\n", is_64bit ? 64 : 32);
dprintf(fd, "Model Name\t\t: QEMU_user-v" QEMU_VERSION "\n");
dprintf(fd, "PRID\t\t\t: %s (%08x)\n",
ser_id == PRID_SERIES_LA464 ? "LA464" :
ser_id == PRID_SERIES_LA132 ? "LA132" : "Unknown",
cpu_env->cpucfg[0]);
dprintf(fd, "CPU Revision\t\t: 0x%02x\n", prid);
dprintf(fd, "FPU Revision\t\t: 0x%02x\n",
FIELD_EX32(cpu_env->cpucfg[2], CPUCFG2, FP_VER));
dprintf(fd, "CPU MHz\t\t\t: %.2f\n", freq_mhz);
dprintf(fd, "Address Sizes\t\t: %d bits physical, %d bits virtual\n",
pabits + 1, vabits + 1);
dprintf(fd, "ISA\t\t\t:%s", " loongarch32r loongarch32s");
if (is_64bit) {
dprintf(fd, " loongarch64");
}
dprintf(fd, "\nFeatures\t\t:");
for (i = 0; i < sizeof(elf_hwcap) * 8; i++) {
if (!(elf_hwcap & (1 << i))) {
continue;
}
hwcap_str = elf_hwcap_str(i);
if (hwcap_str) {
dprintf(fd, " %s", hwcap_str);
}
}
dprintf(fd, "\nHardware Watchpoint\t: no\n");
}
return 0;
}
#define HAVE_ARCH_PROC_CPUINFO
#endif /* LOONGARCH_TARGET_PROC_H */