Patchwork [18/18] hw: add QEMU model for embedded ROM of SoC chips

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Submitter Dante
Date Jan. 18, 2013, 6:33 a.m.
Message ID <1358490795-18791-1-git-send-email-dantesu@faraday-tech.com>
Download mbox | patch
Permalink /patch/213497/
State New
Headers show

Comments

Dante - Jan. 18, 2013, 6:33 a.m.
Signed-off-by: Kuo-Jung Su <dantesu@faraday-tech.com>
---
 hw/rom.c |  126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 hw/rom.c

Patch

diff --git a/hw/rom.c b/hw/rom.c
new file mode 100644
index 0000000..260b78b
--- /dev/null
+++ b/hw/rom.c
@@ -0,0 +1,126 @@ 
+/*
+ * QEMU model of ROM
+ *
+ * Copyright (C) 2012 Faraday Technology
+ * Copyright (C) 2012 Dante Su <dantesu@faraday-tech.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "sysbus.h"
+#include "sysemu/sysemu.h"
+#include "sysemu/blockdev.h"
+
+typedef struct {
+	SysBusDevice busdev;
+	MemoryRegion mem;
+	MemoryRegion *mem_mappings;    /* array; one per mapping */
+    MemoryRegion orig_mem;
+    BlockDriverState *bdrv;
+    uint8_t *storage;
+    uint32_t size;
+} rom_state;
+
+static uint64_t
+rom_mem_read(void *opaque, hwaddr addr, unsigned int size)
+{
+    return 0;
+}
+
+static void
+rom_mem_write(void *opaque, hwaddr addr, uint64_t val64, unsigned int size)
+{
+}
+
+static const MemoryRegionOps rom_ops = {
+    .read  = rom_mem_read,
+    .write = rom_mem_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+    .valid = {
+        .min_access_size = 1,
+        .max_access_size = 8
+    }
+};
+
+static int rom_init(SysBusDevice *dev)
+{
+	rom_state *s = FROM_SYSBUS(typeof(*s), dev);
+	DriveInfo *dinfo;
+	
+	memory_region_init_rom_device(&s->orig_mem, &rom_ops, s, "rom", s->size);
+    vmstate_register_ram(&s->orig_mem, DEVICE(s));
+    s->storage = memory_region_get_ram_ptr(&s->orig_mem);
+
+	dinfo = drive_get_next(IF_PFLASH);
+	if (dinfo && dinfo->bdrv) {
+		s->bdrv = dinfo->bdrv;
+		/* read the initial flash content */
+		bdrv_read(s->bdrv, 0, s->storage, DIV_ROUND_UP(s->size,
+                                                    BDRV_SECTOR_SIZE));
+    } else {
+        memset(s->storage, 0x00, s->size);
+    }
+
+	memory_region_init(&s->mem, "rom", s->size);
+	s->mem_mappings = g_new(MemoryRegion, 1);
+	memory_region_init_alias(&s->mem_mappings[0], "rom-alias", &s->orig_mem, 0, s->size);
+	memory_region_add_subregion(&s->mem, 0, &s->mem_mappings[0]);
+
+	sysbus_init_mmio(dev, &s->mem);
+    return 0;
+}
+
+static Property rom_properties[] = {
+    DEFINE_PROP_UINT32("size", rom_state, size, 16384),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_rom = {
+    .name = "rom",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static void rom_class_init(ObjectClass *klass, void *data)
+{
+	DeviceClass *dc = DEVICE_CLASS(klass);
+	SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
+
+	k->init = rom_init;
+	dc->props = rom_properties;
+	dc->vmsd  = &vmstate_rom;
+}
+
+static TypeInfo rom_info = {
+	.name           = "rom",
+	.parent         = TYPE_SYS_BUS_DEVICE,
+	.instance_size  = sizeof(rom_state),
+	.class_init     = rom_class_init,
+};
+
+static void rom_register_types(void)
+{
+	type_register_static(&rom_info);
+}
+
+type_init(rom_register_types)