linux-user: Implement /proc/cpuinfo for ppc cpus
Mimic the entries for /proc/cpuinfo to what can be seen on two debian porterboxes (ppc64 and ppc64le), which are running via KVM/QEMU. The "timebase" value in /proc/cpuinfo is used by glibc on power, but only if the __kernel_get_tbfreq vdso call isn't implemented. So switch cpu_ppc_load_tbl() for linux-user to get_clock(), as suggested by Richard, and report timebase = 1GHz in /proc/cpuinfo, which will make the vdso implementation simple too. v4: change timebase to 1GHz and use get_clock() v3: drop another colon, indenting fixes v2: drop colon, add clock output, refine pvr calculation Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: Helge Deller <deller@gmx.de>
Helge Deller committed
Jun 11, 2026 at 23:26 UTC
ec9abae78386f44a6f55ed3fe1ad792bab64a806
2 files changed
+91
-2
linux-user/ppc/cpu_loop.c
+1
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@@ -26,7 +26,7 @@
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static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
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{
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- return cpu_get_host_ticks();
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+ return get_clock();
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}
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uint64_t cpu_ppc_load_tbl(CPUPPCState *env)
linux-user/ppc/target_proc.h
+90
-1
@@ -1 +1,90 @@
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-/* No target-specific /proc support */
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+/*
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+ * ppc specific proc functions for linux-user
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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 PPC_TARGET_PROC_H
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+#define PPC_TARGET_PROC_H
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+
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+#include <time.h>
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+
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+#define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */
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+#define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */
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+#define PVR_MAJ(pvr) (((pvr) >> 4) & 0xF) /* Major revision field */
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+#define PVR_MIN(pvr) (((pvr) >> 0) & 0xF) /* Minor revision field */
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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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+ struct timespec res;
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+ double freq_mhz;
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+ int i, num_cpus;
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+ unsigned int maj, min, pvr;
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+
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+ PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(env_cpu(cpu_env));
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+ DeviceClass *dc = DEVICE_CLASS(ppc_cpu_get_family_class(pcc));
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+
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+ pvr = pcc->pvr;
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+
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+ /* Taken from Linux kernel: */
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+ /* If we are a Freescale core do a simple check so
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+ * we don't have to keep adding cases in the future */
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+ if (PVR_VER(pvr) & 0x8000) {
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+ switch (PVR_VER(pvr)) {
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+ case 0x8000: /* 7441/7450/7451, Voyager */
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+ case 0x8001: /* 7445/7455, Apollo 6 */
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+ case 0x8002: /* 7447/7457, Apollo 7 */
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+ case 0x8003: /* 7447A, Apollo 7 PM */
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+ case 0x8004: /* 7448, Apollo 8 */
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+ case 0x800c: /* 7410, Nitro */
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+ maj = ((pvr >> 8) & 0xF);
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+ min = PVR_MIN(pvr);
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+ break;
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+ default: /* e500/book-e */
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+ maj = PVR_MAJ(pvr);
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+ min = PVR_MIN(pvr);
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+ break;
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+ }
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+ } else {
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+ switch (PVR_VER(pvr)) {
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+ case 0x1008: /* 740P/750P ?? */
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+ maj = ((pvr >> 8) & 0xFF) - 1;
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+ min = pvr & 0xFF;
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+ break;
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+ case 0x004e: /* POWER9 bits 12-15 give chip type */
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+ case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
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+ maj = (pvr >> 8) & 0x0F;
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+ min = pvr & 0xFF;
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+ break;
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+ default:
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+ maj = (pvr >> 8) & 0xFF;
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+ min = pvr & 0xFF;
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+ break;
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+ }
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+ }
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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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+ num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
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+ for (i = 0; i < num_cpus; i++) {
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+ dprintf(fd, "processor\t: %d\n", i);
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+ dprintf(fd, "cpu\t\t: %s%s\n",
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+ dc->desc,
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+ pcc->insns_flags & PPC_ALTIVEC ? ", altivec supported":"");
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+ dprintf(fd, "clock\t\t: %.3fMHz\n", freq_mhz);
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+ dprintf(fd, "revision\t: %d.%d (pvr %04x %04x)\n\n",
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+ maj, min, PVR_VER(pvr), PVR_REV(pvr));
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+ }
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+
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+ dprintf(fd, "timebase\t: 1000000000\n");
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+ dprintf(fd, "platform\t: pSeries\n");
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+ dprintf(fd, "model\t\t: IBM pSeries (QEMU user v" QEMU_VERSION ")\n");
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+ dprintf(fd, "machine\t\t: CHRP IBM pSeries\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 /* PPC_TARGET_PROC_H */