[PATCH 5/9] hw/arm/aspeed_ast10x0: Map the secure SRAM

[Philippe Mathieu-Daudé]

Some SRAM appears to be used by the Secure Boot unit and
crypto accelerators. Name it 'secure sram'.

Note, the SRAM base address was already present but unused
(the 'SBC' index is used for the MMIO peripheral).

Interestingly using CFLAGS=-Winitializer-overrides reports:

  ../hw/arm/aspeed_ast10x0.c:32:30: warning: initializer overrides prior 
initialization of this subobject [-Winitializer-overrides]
    [ASPEED_DEV_SBC]       = 0x7E6F2000,
                             ^~~~~~~~~~
  ../hw/arm/aspeed_ast10x0.c:24:30: note: previous initialization is here
    [ASPEED_DEV_SBC]       = 0x79000000,
                             ^~~~~~~~~~
This fixes with Zephyr:

  uart:~$ rsa test
  rsa test vector[0]:
  [00:00:26.156,000] <err> os: ***** BUS FAULT *****
  [00:00:26.157,000] <err> os:   Precise data bus error
  [00:00:26.157,000] <err> os:   BFAR Address: 0x79000000
  [00:00:26.158,000] <err> os: r0/a1:  0x79000000  r1/a2:  0x00000000  r2/a3:  
0x00001800
  [00:00:26.158,000] <err> os: r3/a4:  0x79001800 r12/ip:  0x00000800 r14/lr:  
0x0001098d
  [00:00:26.158,000] <err> os:  xpsr:  0x81000000
  [00:00:26.158,000] <err> os: Faulting instruction address (r15/pc): 0x0001e1bc
  [00:00:26.158,000] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception on CPU 0
  [00:00:26.158,000] <err> os: Current thread: 0x38248 (shell_uart)
  [00:00:26.165,000] <err> os: Halting system

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/arm/aspeed_ast10x0.c     | 11 ++++++++++-
 include/hw/arm/aspeed_soc.h |  3 +++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/hw/arm/aspeed_ast10x0.c b/hw/arm/aspeed_ast10x0.c
index 53ea6d471f..21a2e62345 100644
--- a/hw/arm/aspeed_ast10x0.c
+++ b/hw/arm/aspeed_ast10x0.c
@@ -22,7 +22,7 @@
 
 static const hwaddr aspeed_soc_ast1030_memmap[] = {
     [ASPEED_DEV_SRAM]      = 0x00000000,
-    [ASPEED_DEV_SBC]       = 0x79000000,
+    [ASPEED_DEV_SECSRAM]   = 0x79000000,
     [ASPEED_DEV_IOMEM]     = 0x7E600000,
     [ASPEED_DEV_PWM]       = 0x7E610000,
     [ASPEED_DEV_FMC]       = 0x7E620000,
@@ -222,6 +222,14 @@ static void aspeed_soc_ast1030_realize(DeviceState 
*dev_soc, Error **errp)
     memory_region_add_subregion(s->memory,
                                 sc->memmap[ASPEED_DEV_SRAM],
                                 &s->sram);
+    memory_region_init_ram(&s->secsram, OBJECT(s), "sec.sram",
+                           sc->secsram_size, &err);
+    if (err != NULL) {
+        error_propagate(errp, err);
+        return;
+    }
+    memory_region_add_subregion(s->memory, sc->memmap[ASPEED_DEV_SECSRAM],
+                                &s->secsram);
 
     /* SCU */
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->scu), errp)) {
@@ -401,6 +409,7 @@ static void aspeed_soc_ast1030_class_init(ObjectClass 
*klass, void *data)
     sc->cpu_type = ARM_CPU_TYPE_NAME("cortex-m4");
     sc->silicon_rev = AST1030_A1_SILICON_REV;
     sc->sram_size = 768 * KiB;
+    sc->secsram_size = 9 * KiB;
     sc->spis_num = 2;
     sc->ehcis_num = 0;
     sc->wdts_num = 4;
diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index 9a5e3c0bac..bd1e03e78a 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -71,6 +71,7 @@ struct AspeedSoCState {
     AspeedSMCState spi[ASPEED_SPIS_NUM];
     EHCISysBusState ehci[ASPEED_EHCIS_NUM];
     AspeedSBCState sbc;
+    MemoryRegion secsram;
     UnimplementedDeviceState sbc_unimplemented;
     AspeedSDMCState sdmc;
     AspeedWDTState wdt[ASPEED_WDTS_NUM];
@@ -105,6 +106,7 @@ struct AspeedSoCClass {
     const char *cpu_type;
     uint32_t silicon_rev;
     uint64_t sram_size;
+    uint64_t secsram_size;
     int spis_num;
     int ehcis_num;
     int wdts_num;
@@ -143,6 +145,7 @@ enum {
     ASPEED_DEV_SCU,
     ASPEED_DEV_ADC,
     ASPEED_DEV_SBC,
+    ASPEED_DEV_SECSRAM,
     ASPEED_DEV_EMMC_BC,
     ASPEED_DEV_VIDEO,
     ASPEED_DEV_SRAM,
-- 
2.38.1