hw/arm_boot.c: Make SMP boards specify address to poll in bootup loop

The secondary CPU bootloader in arm_boot.c holds secondary CPUs in a
pen until the primary CPU releases them. Make boards specify the
address to be polled to determine whether to leave the pen (it was
previously hardcoded to 0x10000030, which is a Versatile Express/
Realview specific system register address).

Signed-off-by: Evgeny Voevodin <e.voevodin@samsung.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>

hw/arm-misc.h

@@ -31,6 +31,7 @@ struct arm_boot_info {
     const char *initrd_filename;
     target_phys_addr_t loader_start;
     target_phys_addr_t smp_loader_start;
+    target_phys_addr_t smp_bootreg_addr;
     target_phys_addr_t smp_priv_base;
     int nb_cpus;
     int board_id;

hw/arm_boot.c

@@ -31,17 +31,17 @@ static uint32_t bootloader[] = {
 /* Entry point for secondary CPUs.  Enable interrupt controller and
    Issue WFI until start address is written to system controller.  */
 static uint32_t smpboot[] = {
-  0xe59f0020, /* ldr     r0, privbase */
-  0xe3a01001, /* mov     r1, #1 */
-  0xe5801100, /* str     r1, [r0, #0x100] */
-  0xe3a00201, /* mov     r0, #0x10000000 */
-  0xe3800030, /* orr     r0, #0x30 */
+  0xe59f201c, /* ldr r2, privbase */
+  0xe59f001c, /* ldr r0, startaddr */
+  0xe3a01001, /* mov r1, #1 */
+  0xe5821100, /* str r1, [r2, #256] */
   0xe320f003, /* wfi */
   0xe5901000, /* ldr     r1, [r0] */
   0xe1110001, /* tst     r1, r1 */
   0x0afffffb, /* beq     <wfi> */
   0xe12fff11, /* bx      r1 */
-  0 /* privbase: Private memory region base address.  */
+  0,          /* privbase: Private memory region base address.  */
+  0           /* bootreg: Boot register address is held here */
 };
 
 #define WRITE_WORD(p, value) do { \
@@ -197,6 +197,7 @@ static void do_cpu_reset(void *opaque)
                                     info->loader_start);
                 }
             } else {
+                stl_phys_notdirty(info->smp_bootreg_addr, 0);
                 env->regs[15] = info->smp_loader_start;
             }
         }
@@ -272,8 +273,9 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
         rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
                            info->loader_start);
         if (info->nb_cpus > 1) {
-            smpboot[10] = info->smp_priv_base;
-            for (n = 0; n < sizeof(smpboot) / 4; n++) {
+            smpboot[ARRAY_SIZE(smpboot) - 1] = info->smp_bootreg_addr;
+            smpboot[ARRAY_SIZE(smpboot) - 2] = info->smp_priv_base;
+            for (n = 0; n < ARRAY_SIZE(smpboot); n++) {
                 smpboot[n] = tswap32(smpboot[n]);
             }
             rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot),

hw/realview.c

@@ -21,6 +21,7 @@
 #include "exec-memory.h"
 
 #define SMP_BOOT_ADDR 0xe0000000
+#define SMP_BOOTREG_ADDR 0x10000030
 
 typedef struct {
     SysBusDevice busdev;
@@ -96,6 +97,7 @@ static void realview_register_devices(void)
 
 static struct arm_boot_info realview_binfo = {
     .smp_loader_start = SMP_BOOT_ADDR,
+    .smp_bootreg_addr = SMP_BOOTREG_ADDR,
 };
 
 /* The following two lists must be consistent.  */

hw/vexpress.c

@@ -31,11 +31,13 @@
 #include "exec-memory.h"
 
 #define SMP_BOOT_ADDR 0xe0000000
+#define SMP_BOOTREG_ADDR 0x10000030
 
 #define VEXPRESS_BOARD_ID 0x8e0
 
 static struct arm_boot_info vexpress_binfo = {
     .smp_loader_start = SMP_BOOT_ADDR,
+    .smp_bootreg_addr = SMP_BOOTREG_ADDR,
 };
 
 static void vexpress_a9_init(ram_addr_t ram_size,