[Qemu-devel] [PATCH] PPC: Mac: Fix guest exported tbfreq values

[Alexander Graf <agraf@suse.de>]

We can tell the guest the frequency of its time base through fwcfg.

However, we tell it a different value from the speed tb actually runs
at. Let's fix it and make the tbfreq initialization and the fwcfg exposure
use the same values.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 hw/ppc/mac_newworld.c | 5 +++--
 hw/ppc/mac_oldworld.c | 5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
index 3badfa3..253089a 100644
--- a/hw/ppc/mac_newworld.c
+++ b/hw/ppc/mac_newworld.c
@@ -71,6 +71,7 @@
 
 #define MAX_IDE_BUS 2
 #define CFG_ADDR 0xf0000510
+#define TBFREQ (100UL * 1000UL * 1000UL)
 
 /* debug UniNorth */
 //#define DEBUG_UNIN
@@ -191,7 +192,7 @@ static void ppc_core99_init(QEMUMachineInitArgs *args)
         env = &cpu->env;
 
         /* Set time-base frequency to 100 Mhz */
-        cpu_ppc_tb_init(env, 100UL * 1000UL * 1000UL);
+        cpu_ppc_tb_init(env, TBFREQ);
         qemu_register_reset(ppc_core99_reset, cpu);
     }
 
@@ -460,7 +461,7 @@ static void ppc_core99_init(QEMUMachineInitArgs *args)
         fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_KVM_PID, getpid());
 #endif
     } else {
-        fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_TBFREQ, get_ticks_per_sec());
+        fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_TBFREQ, TBFREQ);
     }
     /* Mac OS X requires a "known good" clock-frequency value; pass it one. */
     fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_CLOCKFREQ, 266000000);
diff --git a/hw/ppc/mac_oldworld.c b/hw/ppc/mac_oldworld.c
index abab5e4..230bb30 100644
--- a/hw/ppc/mac_oldworld.c
+++ b/hw/ppc/mac_oldworld.c
@@ -45,6 +45,7 @@
 
 #define MAX_IDE_BUS 2
 #define CFG_ADDR 0xf0000510
+#define TBFREQ 16600000UL
 
 static int fw_cfg_boot_set(void *opaque, const char *boot_device)
 {
@@ -114,7 +115,7 @@ static void ppc_heathrow_init(QEMUMachineInitArgs *args)
         env = &cpu->env;
 
         /* Set time-base frequency to 16.6 Mhz */
-        cpu_ppc_tb_init(env,  16600000UL);
+        cpu_ppc_tb_init(env,  TBFREQ);
         qemu_register_reset(ppc_heathrow_reset, cpu);
     }
 
@@ -330,7 +331,7 @@ static void ppc_heathrow_init(QEMUMachineInitArgs *args)
         fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_KVM_PID, getpid());
 #endif
     } else {
-        fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_TBFREQ, get_ticks_per_sec());
+        fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_TBFREQ, TBFREQ);
     }
     /* Mac OS X requires a "known good" clock-frequency value; pass it one. */
     fw_cfg_add_i32(fw_cfg, FW_CFG_PPC_CLOCKFREQ, 266000000);
-- 
1.8.1.4