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[2/5] hw/hppa: Make number of TLB and BTLB entries configurable

Message ID 20200827203517.29404-3-deller@gmx.de
State New
Headers show
Series None | expand

Commit Message

Helge Deller Aug. 27, 2020, 8:35 p.m. UTC 
Until now the TLB size was fixed at 256 entries. To allow operating
systems to utilize more TLB entries in the future, we need to tell
firmware how many TLB entries we actually support in the emulation.
Firmware then reports this to the operating system via the
PDC_CACHE_INFO call.

This patch simply does the preparation to allow more TLB entries.

Signed-off-by: Helge Deller <deller@gmx.de>
---
 hw/hppa/machine.c | 8 ++++++++
 target/hppa/cpu.h | 5 ++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

--
2.21.3
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Patch

diff --git a/hw/hppa/machine.c b/hw/hppa/machine.c
index 90aeefe2a4..e9d84d0f03 100644
--- a/hw/hppa/machine.c
+++ b/hw/hppa/machine.c
@@ -72,6 +72,14 @@  static FWCfgState *create_fw_cfg(MachineState *ms)
     fw_cfg_add_file(fw_cfg, "/etc/firmware-min-version",
                     g_memdup(&val, sizeof(val)), sizeof(val));

+    val = cpu_to_le64(HPPA_TLB_ENTRIES);
+    fw_cfg_add_file(fw_cfg, "/etc/cpu/tlb_entries",
+                    g_memdup(&val, sizeof(val)), sizeof(val));
+
+    val = cpu_to_le64(HPPA_BTLB_ENTRIES);
+    fw_cfg_add_file(fw_cfg, "/etc/cpu/btlb_entries",
+                    g_memdup(&val, sizeof(val)), sizeof(val));
+
     return fw_cfg;
 }

diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h
index 801a4fb1ba..440104dc3c 100644
--- a/target/hppa/cpu.h
+++ b/target/hppa/cpu.h
@@ -196,9 +196,12 @@  struct CPUHPPAState {
     target_ureg shadow[7];   /* shadow registers */

     /* ??? The number of entries isn't specified by the architecture.  */
+    #define HPPA_TLB_ENTRIES        256
+    #define HPPA_BTLB_ENTRIES       0
+
     /* ??? Implement a unified itlb/dtlb for the moment.  */
     /* ??? We should use a more intelligent data structure.  */
-    hppa_tlb_entry tlb[256];
+    hppa_tlb_entry tlb[HPPA_TLB_ENTRIES];
     uint32_t tlb_last;
 };