hw/arm/mps2-tz: Get armv7m_load_kernel() size argument from RAMInfo

The armv7m_load_kernel() function takes a mem_size argument which it
expects to be the size of the memory region at guest address 0.  (It
uses this argument only as a limit on how large a raw image file it
can load at address zero).

Instead of hardcoding this value, find the RAMInfo corresponding to
the 0 address and extract its size.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210215115138.20465-20-peter.maydell@linaro.org

hw/arm/mps2-tz.c

@@ -525,6 +525,20 @@ static void create_non_mpc_ram(MPS2TZMachineState *mms)
     }
 }
 
+static uint32_t boot_ram_size(MPS2TZMachineState *mms)
+{
+    /* Return the size of the RAM block at guest address zero */
+    const RAMInfo *p;
+    MPS2TZMachineClass *mmc = MPS2TZ_MACHINE_GET_CLASS(mms);
+
+    for (p = mmc->raminfo; p->name; p++) {
+        if (p->base == 0) {
+            return p->size;
+        }
+    }
+    g_assert_not_reached();
+}
+
 static void mps2tz_common_init(MachineState *machine)
 {
     MPS2TZMachineState *mms = MPS2TZ_MACHINE(machine);
@@ -789,7 +803,8 @@ static void mps2tz_common_init(MachineState *machine)
 
     create_non_mpc_ram(mms);
 
-    armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename, 0x400000);
+    armv7m_load_kernel(ARM_CPU(first_cpu), machine->kernel_filename,
+                       boot_ram_size(mms));
 }
 
 static void mps2_tz_idau_check(IDAUInterface *ii, uint32_t address,