[PATCH v3 3/3] linux-user: Emulate /proc/cpuinfo for Alpha

[Helge Deller]

Add emulation for /proc/cpuinfo for the alpha architecture.

alpha output example:

(alpha-chroot)root@p100:/# cat /proc/cpuinfo
cpu                     : Alpha
cpu model               : ev67
cpu variation           : 7
cpu revision            : 0
cpu serial number       : JA00000000
system type             : QEMU
system variation        : QEMU_v8.0.92
system revision         : 0
system serial number    : AY00000000
cycle frequency [Hz]    : 250000000
timer frequency [Hz]    : 250.00
page size [bytes]       : 8192
phys. address bits      : 44
max. addr. space #      : 255
BogoMIPS                : 2500.00
platform string         : AlphaServer QEMU user-mode VM
cpus detected           : 8
cpus active             : 4
cpu active mask         : 0000000000000095
L1 Icache               : n/a
L1 Dcache               : n/a
L2 cache                : n/a
L3 cache                : n/a

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: Michael Cree <mcree@orcon.net.nz>

v2:
- revised platform string and system variation output
- show cpus detected/active/active mask based on
  current physical machine configuration
---
 linux-user/syscall.c | 56 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 54 insertions(+), 2 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index bac764f502..a4d597ac05 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8324,7 +8324,7 @@ void target_exception_dump(CPUArchState *env, const char 
*fmt, int code)
 #if HOST_BIG_ENDIAN != TARGET_BIG_ENDIAN || \
     defined(TARGET_SPARC) || defined(TARGET_M68K) || defined(TARGET_HPPA) || \
     defined(TARGET_RISCV) || defined(TARGET_S390X) || defined(TARGET_ARM) || \
-    defined(TARGET_AARCH64)
+    defined(TARGET_AARCH64) || defined(TARGET_ALPHA)
 static int is_proc(const char *filename, const char *entry)
 {
     return strcmp(filename, entry) == 0;
@@ -8376,6 +8376,57 @@ static int open_net_route(CPUArchState *cpu_env, int fd)
 }
 #endif

+#if defined(TARGET_ALPHA)
+static int open_cpuinfo(CPUArchState *cpu_env, int fd)
+{
+    int max_cpus = sysconf(_SC_NPROCESSORS_CONF);
+    int num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
+    uint64_t cpu_mask;
+    char model[32];
+    char *p;
+    AlphaCPU *cpu = env_archcpu(cpu_env);
+    CPUAlphaState *env = &cpu->env;
+
+    g_strlcpy(model, object_class_get_name(
+                        OBJECT_CLASS(CPU_GET_CLASS(env_cpu(cpu_env)))),
+              sizeof(model));
+    p = strchr(model, '-');
+    if (p) {
+        *p = '\0';
+    }
+    if (sched_getaffinity(getpid(), sizeof(cpu_mask),
+                          (cpu_set_t *) &cpu_mask) < 0) {
+        cpu_mask = (1ULL << num_cpus) - 1;
+    }
+
+    dprintf(fd, "cpu\t\t\t: Alpha\n");
+    dprintf(fd, "cpu model\t\t: %s\n", model);
+    dprintf(fd, "cpu variation\t\t: %d\n", env->implver + 5);
+    dprintf(fd, "cpu revision\t\t: 0\n");
+    dprintf(fd, "cpu serial number\t: JA00000000\n");
+    dprintf(fd, "system type\t\t: QEMU\n");
+    dprintf(fd, "system variation\t: QEMU_v%s\n", QEMU_VERSION);
+    dprintf(fd, "system revision\t\t: 0\n");
+    dprintf(fd, "system serial number\t: AY00000000\n");
+    dprintf(fd, "cycle frequency [Hz]\t: 250000000\n");
+    dprintf(fd, "timer frequency [Hz]\t: 250.00\n");
+    dprintf(fd, "page size [bytes]\t: %d\n", TARGET_PAGE_SIZE);
+    dprintf(fd, "phys. address bits\t: %d\n", TARGET_PHYS_ADDR_SPACE_BITS);
+    dprintf(fd, "max. addr. space #\t: 255\n");
+    dprintf(fd, "BogoMIPS\t\t: 2500.00\n");
+    dprintf(fd, "platform string\t\t: AlphaServer QEMU user-mode VM\n");
+    dprintf(fd, "cpus detected\t\t: %d\n", max_cpus);
+    dprintf(fd, "cpus active\t\t: %d\n", num_cpus);
+    dprintf(fd, "cpu active mask\t\t: %016llx\n", (unsigned long long) 
cpu_mask);
+    dprintf(fd, "L1 Icache\t\t: n/a\n");
+    dprintf(fd, "L1 Dcache\t\t: n/a\n");
+    dprintf(fd, "L2 cache\t\t: n/a\n");
+    dprintf(fd, "L3 cache\t\t: n/a\n");
+    return 0;
+}
+#endif
+
+
 #if defined(TARGET_SPARC)
 static int open_cpuinfo(CPUArchState *cpu_env, int fd)
 {
@@ -8633,7 +8684,8 @@ int do_guest_openat(CPUArchState *cpu_env, int dirfd, 
const char *fname,
 #endif
 #if defined(TARGET_SPARC) || defined(TARGET_HPPA) || \
     defined(TARGET_RISCV) || defined(TARGET_S390X) || \
-    defined(TARGET_ARM)   || defined(TARGET_AARCH64)
+    defined(TARGET_ARM)   || defined(TARGET_AARCH64) || \
+    defined(TARGET_ALPHA)
         { "/proc/cpuinfo", open_cpuinfo, is_proc },
 #endif
 #if defined(TARGET_M68K)
--
2.41.0