[Qemu-devel] [PATCH v3 10/11] AARCH64: Add flags and boot parameters for 32-bit guests on AARCH64

["Mian M. Hamayun" <m.hamayun@virtualopensystems.com>]

From: "Mian M. Hamayun" <m.hamayun@virtualopensystems.com>

This commit adds the necessary flags and kernel load address to enable
booting of 32-bit guests on AArch64 processors.

The actual enable/disable mechanism is not included in this commit,
which should tweak the value of env->aarch64 variable for this purpose.

Signed-off-by: Mian M. Hamayun <m.hamayun@virtualopensystems.com>
---
 hw/arm/boot.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index ddafd3b..2cfa9bf 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -20,6 +20,10 @@
 #define KERNEL_ARGS_ADDR 0x100
 
 #ifdef TARGET_AARCH64
+#define COMPAT_PSR_F_BIT    0x00000040
+#define COMPAT_PSR_I_BIT    0x00000080
+#define COMPAT_PSR_MODE_SVC 0x00000013
+
 static uint32_t bootloader_arm64[] = {
     0x580000c0, 	/* ldr	x0, 18 ; Load the lower 32-bits of DTB */
     0xaa1f03e1, 	/* mov	x1, xzr */
@@ -144,7 +148,8 @@ static void setup_boot_env(ARMCPU *cpu)
     }
     else {
         /* AARCH32 Mode */
-        /* TODO: Specify Kernel Load Address for AARCH32 */
+        kernel_load_addr = 0x00008000;
+        setup_boot_env_32();
     }
 #else
     /* ARMv7 */
@@ -431,7 +436,7 @@ static void do_cpu_reset(void *opaque)
             if(env->aarch64) {
                 env->pstate = PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT | PSR_MODE_EL1h;
             } else {
-                hw_error("AArch32 mode is currently not supported\n");
+                env->pstate = COMPAT_PSR_I_BIT | COMPAT_PSR_F_BIT | COMPAT_PSR_MODE_SVC;
             }
             env->xregs[0] =  0;
             env->xregs[1] = -1;
-- 
1.8.1.2