starred/qemu-qemu
1
0
Fork 0
mirror of https://github.com/qemu/qemu.git synced 2026-07-08 17:46:17 +00:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Helge Deller
2026-06-11 23:26:33 +02:00
parent fb4c08147b
commit ec9abae783
2 changed files with 91 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
linux-user/ppc/cpu_loop.c
View File

@@ -26,7 +26,7 @@
static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
{
return cpu_get_host_ticks();
return get_clock();
}
uint64_t cpu_ppc_load_tbl(CPUPPCState *env)

91
linux-user/ppc/target_proc.h
View File

@@ -1 +1,90 @@
/* No target-specific /proc support */
/*
* ppc specific proc functions for linux-user
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef PPC_TARGET_PROC_H
#define PPC_TARGET_PROC_H
#include <time.h>
#define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */
#define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */
#define PVR_MAJ(pvr) (((pvr) >> 4) & 0xF) /* Major revision field */
#define PVR_MIN(pvr) (((pvr) >> 0) & 0xF) /* Minor revision field */
static int open_cpuinfo(CPUArchState *cpu_env, int fd)
{
struct timespec res;
double freq_mhz;
int i, num_cpus;
unsigned int maj, min, pvr;
PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(env_cpu(cpu_env));
DeviceClass *dc = DEVICE_CLASS(ppc_cpu_get_family_class(pcc));
pvr = pcc->pvr;
/* Taken from Linux kernel: */
/* If we are a Freescale core do a simple check so
* we don't have to keep adding cases in the future */
if (PVR_VER(pvr) & 0x8000) {
switch (PVR_VER(pvr)) {
case 0x8000: /* 7441/7450/7451, Voyager */
case 0x8001: /* 7445/7455, Apollo 6 */
case 0x8002: /* 7447/7457, Apollo 7 */
case 0x8003: /* 7447A, Apollo 7 PM */
case 0x8004: /* 7448, Apollo 8 */
case 0x800c: /* 7410, Nitro */
maj = ((pvr >> 8) & 0xF);
min = PVR_MIN(pvr);
break;
default: /* e500/book-e */
maj = PVR_MAJ(pvr);
min = PVR_MIN(pvr);
break;
}
} else {
switch (PVR_VER(pvr)) {
case 0x1008: /* 740P/750P ?? */
maj = ((pvr >> 8) & 0xFF) - 1;
min = pvr & 0xFF;
break;
case 0x004e: /* POWER9 bits 12-15 give chip type */
case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
maj = (pvr >> 8) & 0x0F;
min = pvr & 0xFF;
break;
default:
maj = (pvr >> 8) & 0xFF;
min = pvr & 0xFF;
break;
}
}
if (clock_getres(CLOCK_REALTIME, &res) == -1) {
res.tv_nsec = 1;
}
freq_mhz = 1000.0 / res.tv_nsec;
num_cpus = sysconf(_SC_NPROCESSORS_ONLN);
for (i = 0; i < num_cpus; i++) {
dprintf(fd, "processor\t: %d\n", i);
dprintf(fd, "cpu\t\t: %s%s\n",
dc->desc,
pcc->insns_flags & PPC_ALTIVEC ? ", altivec supported":"");
dprintf(fd, "clock\t\t: %.3fMHz\n", freq_mhz);
dprintf(fd, "revision\t: %d.%d (pvr %04x %04x)\n\n",
maj, min, PVR_VER(pvr), PVR_REV(pvr));
}
dprintf(fd, "timebase\t: 1000000000\n");
dprintf(fd, "platform\t: pSeries\n");
dprintf(fd, "model\t\t: IBM pSeries (QEMU user v" QEMU_VERSION ")\n");
dprintf(fd, "machine\t\t: CHRP IBM pSeries\n");
return 0;
}
#define HAVE_ARCH_PROC_CPUINFO
#endif /* PPC_TARGET_PROC_H */