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armv7m: Make ARMv7M object take memory region link 

Make the ARMv7M object take a memory region link which it uses
to wire up the bitband rather than having them always put
themselves in the system address space.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1487604965-23220-6-git-send-email-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2017-02-20 15:35:59 +00:00
parent 21e0c38fe2
commit 618119c2d3
2 changed files with 32 additions and 1 deletions
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23
hw/arm/armv7m.c
View File

@ -18,6 +18,7 @@
#include "elf.h"
#include "sysemu/qtest.h"
#include "qemu/error-report.h"
#include "exec/address-spaces.h"
/* Bitbanded IO. Each word corresponds to a single bit. */
@ -148,6 +149,14 @@ static void armv7m_instance_init(Object *obj)
/* Can't init the cpu here, we don't yet know which model to use */
object_property_add_link(obj, "memory",
TYPE_MEMORY_REGION,
(Object **)&s->board_memory,
qdev_prop_allow_set_link_before_realize,
OBJ_PROP_LINK_UNREF_ON_RELEASE,
&error_abort);
memory_region_init(&s->container, obj, "armv7m-container", UINT64_MAX);
object_initialize(&s->nvic, sizeof(s->nvic), "armv7m_nvic");
qdev_set_parent_bus(DEVICE(&s->nvic), sysbus_get_default());
object_property_add_alias(obj, "num-irq",
@ -169,6 +178,13 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
const char *typename;
CPUClass *cc;
if (!s->board_memory) {
error_setg(errp, "memory property was not set");
return;
}
memory_region_add_subregion_overlap(&s->container, 0, s->board_memory, -1);
cpustr = g_strsplit(s->cpu_model, ",", 2);
oc = cpu_class_by_name(TYPE_ARM_CPU, cpustr[0]);
@ -193,6 +209,8 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
return;
}
object_property_set_link(OBJECT(s->cpu), OBJECT(&s->container), "memory",
&error_abort);
object_property_set_bool(OBJECT(s->cpu), true, "realized", &err);
if (err != NULL) {
error_propagate(errp, err);
@ -233,7 +251,8 @@ static void armv7m_realize(DeviceState *dev, Error **errp)
return;
}
sysbus_mmio_map(sbd, 0, bitband_output_addr[i]);
memory_region_add_subregion(&s->container, bitband_output_addr[i],
sysbus_mmio_get_region(sbd, 0));
}
}
@ -281,6 +300,8 @@ DeviceState *armv7m_init(MemoryRegion *system_memory, int mem_size, int num_irq,
armv7m = qdev_create(NULL, "armv7m");
qdev_prop_set_uint32(armv7m, "num-irq", num_irq);
qdev_prop_set_string(armv7m, "cpu-model", cpu_model);
object_property_set_link(OBJECT(armv7m), OBJECT(get_system_memory()),
"memory", &error_abort);
/* This will exit with an error if the user passed us a bad cpu_model */
qdev_init_nofail(armv7m);

10
include/hw/arm/armv7m.h
View File

@ -35,6 +35,9 @@ typedef struct {
* + Named GPIO output SYSRESETREQ: signalled for guest AIRCR.SYSRESETREQ
* + Property "cpu-model": CPU model to instantiate
* + Property "num-irq": number of external IRQ lines
* + Property "memory": MemoryRegion defining the physical address space
* that CPU accesses see. (The NVIC, bitbanding and other CPU-internal
* devices will be automatically layered on top of this view.)
*/
typedef struct ARMv7MState {
/*< private >*/
@ -44,8 +47,15 @@ typedef struct ARMv7MState {
BitBandState bitband[ARMV7M_NUM_BITBANDS];
ARMCPU *cpu;
/* MemoryRegion we pass to the CPU, with our devices layered on
* top of the ones the board provides in board_memory.
*/
MemoryRegion container;
/* Properties */
char *cpu_model;
/* MemoryRegion the board provides to us (with its devices, RAM, etc) */
MemoryRegion *board_memory;
} ARMv7MState;
#endif