arm/boot: move highbank secure board setup code to common routine

The new version is slightly different, to support Rasbperry Pi (in
particular, Pi1's arm11 core which doesn't support v7 instructions
such as MOVW).

Tested-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Andrew Baumann <Andrew.Baumann@microsoft.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

3 files changed, 58 insertions, 35 deletions

diff --git a/hw/arm/boot.c b/hw/arm/boot.c
index d05a9986ed..cce8c7cd1c 100644
--- a/hw/arm/boot.c
+++ b/hw/arm/boot.c
@@ -178,6 +178,57 @@ static void default_write_secondary(ARMCPU *cpu,
                      smpboot, fixupcontext);
 }
 
+void arm_write_secure_board_setup_dummy_smc(ARMCPU *cpu,
+                                            const struct arm_boot_info *info,
+                                            hwaddr mvbar_addr)
+{
+    int n;
+    uint32_t mvbar_blob[] = {
+        /* mvbar_addr: secure monitor vectors
+         * Default unimplemented and unused vectors to spin. Makes it
+         * easier to debug (as opposed to the CPU running away).
+         */
+        0xeafffffe, /* (spin) */
+        0xeafffffe, /* (spin) */
+        0xe1b0f00e, /* movs pc, lr ;SMC exception return */
+        0xeafffffe, /* (spin) */
+        0xeafffffe, /* (spin) */
+        0xeafffffe, /* (spin) */
+        0xeafffffe, /* (spin) */
+        0xeafffffe, /* (spin) */
+    };
+    uint32_t board_setup_blob[] = {
+        /* board setup addr */
+        0xe3a00e00 + (mvbar_addr >> 4), /* mov r0, #mvbar_addr */
+        0xee0c0f30, /* mcr     p15, 0, r0, c12, c0, 1 ;set MVBAR */
+        0xee110f11, /* mrc     p15, 0, r0, c1 , c1, 0 ;read SCR */
+        0xe3800031, /* orr     r0, #0x31              ;enable AW, FW, NS */
+        0xee010f11, /* mcr     p15, 0, r0, c1, c1, 0  ;write SCR */
+        0xe1a0100e, /* mov     r1, lr                 ;save LR across SMC */
+        0xe1600070, /* smc     #0                     ;call monitor to flush SCR */
+        0xe1a0f001, /* mov     pc, r1                 ;return */
+    };
+
+    /* check that mvbar_addr is correctly aligned and relocatable (using MOV) */
+    assert((mvbar_addr & 0x1f) == 0 && (mvbar_addr >> 4) < 0x100);
+
+    /* check that these blobs don't overlap */
+    assert((mvbar_addr + sizeof(mvbar_blob) <= info->board_setup_addr)
+          || (info->board_setup_addr + sizeof(board_setup_blob) <= mvbar_addr));
+
+    for (n = 0; n < ARRAY_SIZE(mvbar_blob); n++) {
+        mvbar_blob[n] = tswap32(mvbar_blob[n]);
+    }
+    rom_add_blob_fixed("board-setup-mvbar", mvbar_blob, sizeof(mvbar_blob),
+                       mvbar_addr);
+
+    for (n = 0; n < ARRAY_SIZE(board_setup_blob); n++) {
+        board_setup_blob[n] = tswap32(board_setup_blob[n]);
+    }
+    rom_add_blob_fixed("board-setup", board_setup_blob,
+                       sizeof(board_setup_blob), info->board_setup_addr);
+}
+
 static void default_reset_secondary(ARMCPU *cpu,
                                     const struct arm_boot_info *info)
 {
diff --git a/hw/arm/highbank.c b/hw/arm/highbank.c
index 620b52631a..e25cf5e3f3 100644
--- a/hw/arm/highbank.c
+++ b/hw/arm/highbank.c
@@ -35,49 +35,16 @@
 #define MPCORE_PERIPHBASE       0xfff10000
 
 #define MVBAR_ADDR              0x200
+#define BOARD_SETUP_ADDR        (MVBAR_ADDR + 8 * sizeof(uint32_t))
 
 #define NIRQ_GIC                160
 
 /* Board init.  */
 
-/* MVBAR_ADDR is limited by precision of movw */
-
-QEMU_BUILD_BUG_ON(MVBAR_ADDR >= (1 << 16));
-
-#define ARMV7_IMM16(x) (extract32((x),  0, 12) | \
-                        extract32((x), 12,  4) << 16)
-
 static void hb_write_board_setup(ARMCPU *cpu,
                                  const struct arm_boot_info *info)
 {
-    int n;
-    uint32_t board_setup_blob[] = {
-        /* MVBAR_ADDR */
-        /* Default unimplemented and unused vectors to spin. Makes it
-         * easier to debug (as opposed to the CPU running away).
-         */
-        0xeafffffe, /* notused1: b notused */
-        0xeafffffe, /* notused2: b notused */
-        0xe1b0f00e, /* smc: movs pc, lr - exception return */
-        0xeafffffe, /* prefetch_abort: b prefetch_abort */
-        0xeafffffe, /* data_abort: b data_abort */
-        0xeafffffe, /* notused3: b notused3 */
-        0xeafffffe, /* irq: b irq */
-        0xeafffffe, /* fiq: b fiq */
-#define BOARD_SETUP_ADDR (MVBAR_ADDR + 8 * sizeof(uint32_t))
-        0xe3000000 + ARMV7_IMM16(MVBAR_ADDR), /* movw r0, MVBAR_ADDR */
-        0xee0c0f30, /* mcr p15, 0, r0, c12, c0, 1 - set MVBAR */
-        0xee110f11, /* mrc p15, 0, r0, c1 , c1, 0 - get SCR */
-        0xe3810001, /* orr r0, #1 - set NS */
-        0xee010f11, /* mcr p15, 0, r0, c1 , c1, 0 - set SCR */
-        0xe1600070, /* smc - go to monitor mode to flush NS change */
-        0xe12fff1e, /* bx lr - return to caller */
-    };
-    for (n = 0; n < ARRAY_SIZE(board_setup_blob); n++) {
-        board_setup_blob[n] = tswap32(board_setup_blob[n]);
-    }
-    rom_add_blob_fixed("board-setup", board_setup_blob,
-                       sizeof(board_setup_blob), MVBAR_ADDR);
+    arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
 }
 
 static void hb_write_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
diff --git a/include/hw/arm/arm.h b/include/hw/arm/arm.h
index c26b0e357f..52ecf4aa8f 100644
--- a/include/hw/arm/arm.h
+++ b/include/hw/arm/arm.h
@@ -122,6 +122,11 @@ struct arm_boot_info {
  */
 void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info);
 
+/* Write a secure board setup routine with a dummy handler for SMCs */
+void arm_write_secure_board_setup_dummy_smc(ARMCPU *cpu,
+                                            const struct arm_boot_info *info,
+                                            hwaddr mvbar_addr);
+
 /* Multiplication factor to convert from system clock ticks to qemu timer
    ticks.  */
 extern int system_clock_scale;