target-info: Add page_bits_{init,vary}

Add two fields that will hold TARGET_PAGE_BITS,
TARGET_PAGE_BITS_VARY, TARGET_PAGE_BITS_LEGACY.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260217095106.598486-3-richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

configs/targets/aarch64-softmmu.c

@@ -10,6 +10,7 @@
 #include "qemu/target-info-impl.h"
 #include "hw/arm/machines-qom.h"
 #include "target/arm/cpu-qom.h"
+#include "target/arm/cpu-param.h"
 
 static const TargetInfo target_info_aarch64_system = {
     .target_name = "aarch64",
@@ -18,6 +19,8 @@ static const TargetInfo target_info_aarch64_system = {
     .cpu_type = TYPE_ARM_CPU,
     .machine_typename = TYPE_TARGET_AARCH64_MACHINE,
     .endianness = ENDIAN_MODE_LITTLE,
+    .page_bits_vary = true,
+    .page_bits_init = TARGET_PAGE_BITS_LEGACY,
 };
 
 const TargetInfo *target_info(void)

configs/targets/arm-softmmu.c

@@ -10,6 +10,7 @@
 #include "qemu/target-info-impl.h"
 #include "hw/arm/machines-qom.h"
 #include "target/arm/cpu-qom.h"
+#include "target/arm/cpu-param.h"
 
 static const TargetInfo target_info_arm_system = {
     .target_name = "arm",
@@ -18,6 +19,8 @@ static const TargetInfo target_info_arm_system = {
     .cpu_type = TYPE_ARM_CPU,
     .machine_typename = TYPE_TARGET_ARM_MACHINE,
     .endianness = ENDIAN_MODE_LITTLE,
+    .page_bits_vary = true,
+    .page_bits_init = TARGET_PAGE_BITS_LEGACY,
 };
 
 const TargetInfo *target_info(void)

include/qemu/target-info-impl.h

@@ -25,6 +25,13 @@ typedef struct TargetInfo {
     const char *machine_typename;
     /* related to TARGET_BIG_ENDIAN definition */
     EndianMode endianness;
+    /*
+     * runtime equivalent of
+     *   TARGET_PAGE_BITS_VARY ? TARGET_PAGE_BITS_LEGACY : TARGET_PAGE_BITS
+     */
+    unsigned page_bits_init;
+    /* runtime equivalent of TARGET_PAGE_BITS_VARY definition */
+    bool page_bits_vary;
 } TargetInfo;
 
 /**

target-info-stub.c

@@ -23,6 +23,15 @@ static const TargetInfo target_info_stub = {
     .cpu_type = CPU_RESOLVING_TYPE,
     .machine_typename = TYPE_MACHINE,
     .endianness = TARGET_BIG_ENDIAN ? ENDIAN_MODE_BIG : ENDIAN_MODE_LITTLE,
+#ifdef TARGET_PAGE_BITS_VARY
+    .page_bits_vary = true,
+# ifdef TARGET_PAGE_BITS_LEGACY
+    .page_bits_init = TARGET_PAGE_BITS_LEGACY,
+# endif
+#else
+    .page_bits_vary = false,
+    .page_bits_init = TARGET_PAGE_BITS,
+#endif
 };
 
 const TargetInfo *target_info(void)