[Qemu-devel] [PATCH V2 1/2] hw/arm/exynos4210.c: convert chipid_and_omr to an mmio region

[Igor Mitsyanko <i.mitsyanko@gmail.com>]

From: Igor Mitsyanko <i.mitsyanko@samsung.com>

Exynos SoC was misusing memory_region_init_ram_ptr(): this interface can safely
be used only for memory regions which size is a multiple of target page size.
Change chipid_and_omr memory to an mmio region to fix this.

Signed-off-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
---
 hw/arm/exynos4210.c | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/hw/arm/exynos4210.c b/hw/arm/exynos4210.c
index 6c2dca5..c998fbb 100644
--- a/hw/arm/exynos4210.c
+++ b/hw/arm/exynos4210.c
@@ -84,6 +84,28 @@
 static uint8_t chipid_and_omr[] = { 0x11, 0x02, 0x21, 0x43,
                                     0x09, 0x00, 0x00, 0x00 };
 
+static uint64_t exynos4210_chipid_and_omr_read(void *opaque, hwaddr offset,
+                                               unsigned size)
+{
+    assert(offset < sizeof(chipid_and_omr));
+    return chipid_and_omr[offset];
+}
+
+static void exynos4210_chipid_and_omr_write(void *opaque, hwaddr offset,
+                                            uint64_t value, unsigned size)
+{
+    return;
+}
+
+static const MemoryRegionOps exynos4210_chipid_and_omr_ops = {
+    .read = exynos4210_chipid_and_omr_read,
+    .write = exynos4210_chipid_and_omr_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .impl = {
+        .max_access_size = 1,
+    }
+};
+
 void exynos4210_write_secondary(ARMCPU *cpu,
         const struct arm_boot_info *info)
 {
@@ -224,9 +246,8 @@ Exynos4210State *exynos4210_init(MemoryRegion *system_mem,
     /*** Memory ***/
 
     /* Chip-ID and OMR */
-    memory_region_init_ram_ptr(&s->chipid_mem, "exynos4210.chipid",
-            sizeof(chipid_and_omr), chipid_and_omr);
-    memory_region_set_readonly(&s->chipid_mem, true);
+    memory_region_init_io(&s->chipid_mem, &exynos4210_chipid_and_omr_ops,
+        NULL, "exynos4210.chipid", sizeof(chipid_and_omr));
     memory_region_add_subregion(system_mem, EXYNOS4210_CHIPID_ADDR,
                                 &s->chipid_mem);
 
-- 
1.8.1.4