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hw/arm_gic: Expose GIC CPU interfaces as sysbus memory regions

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Expose the ARM GIC CPU interfaces as memory regions, rather than
just providing read and write functions for them.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2011-12-05 12:52:33 +00:00
parent b9dc07d42a
commit e2c564657c
1 changed files with 74 additions and 1 deletions
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75
hw/arm_gic.c
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@ -103,7 +103,14 @@ typedef struct gic_state
int num_cpu;
#endif
MemoryRegion iomem;
MemoryRegion iomem; /* Distributor */
#ifndef NVIC
/* This is just so we can have an opaque pointer which identifies
* both this GIC and which CPU interface we should be accessing.
*/
struct gic_state *backref[NCPU];
MemoryRegion cpuiomem[NCPU+1]; /* CPU interfaces */
#endif
} gic_state;
/* TODO: Many places that call this routine could be optimized. */
@ -633,6 +640,54 @@ static void gic_cpu_write(gic_state *s, int cpu, int offset, uint32_t value)
}
gic_update(s);
}
/* Wrappers to read/write the GIC CPU interface for the current CPU */
static uint64_t gic_thiscpu_read(void *opaque, target_phys_addr_t addr,
unsigned size)
{
gic_state *s = (gic_state *)opaque;
return gic_cpu_read(s, gic_get_current_cpu(), addr & 0xff);
}
static void gic_thiscpu_write(void *opaque, target_phys_addr_t addr,
uint64_t value, unsigned size)
{
gic_state *s = (gic_state *)opaque;
gic_cpu_write(s, gic_get_current_cpu(), addr & 0xff, value);
}
/* Wrappers to read/write the GIC CPU interface for a specific CPU.
* These just decode the opaque pointer into gic_state* + cpu id.
*/
static uint64_t gic_do_cpu_read(void *opaque, target_phys_addr_t addr,
unsigned size)
{
gic_state **backref = (gic_state **)opaque;
gic_state *s = *backref;
int id = (backref - s->backref);
return gic_cpu_read(s, id, addr & 0xff);
}
static void gic_do_cpu_write(void *opaque, target_phys_addr_t addr,
uint64_t value, unsigned size)
{
gic_state **backref = (gic_state **)opaque;
gic_state *s = *backref;
int id = (backref - s->backref);
gic_cpu_write(s, id, addr & 0xff, value);
}
static const MemoryRegionOps gic_thiscpu_ops = {
.read = gic_thiscpu_read,
.write = gic_thiscpu_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const MemoryRegionOps gic_cpu_ops = {
.read = gic_do_cpu_read,
.write = gic_do_cpu_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
#endif
static void gic_reset(gic_state *s)
@ -752,6 +807,24 @@ static void gic_init(gic_state *s)
sysbus_init_irq(&s->busdev, &s->parent_irq[i]);
}
memory_region_init_io(&s->iomem, &gic_dist_ops, s, "gic_dist", 0x1000);
#ifndef NVIC
/* Memory regions for the CPU interfaces (NVIC doesn't have these):
* a region for "CPU interface for this core", then a region for
* "CPU interface for core 0", "for core 1", ...
* NB that the memory region size of 0x100 applies for the 11MPCore
* and also cores following the GIC v1 spec (ie A9).
* GIC v2 defines a larger memory region (0x1000) so this will need
* to be extended when we implement A15.
*/
memory_region_init_io(&s->cpuiomem[0], &gic_thiscpu_ops, s,
"gic_cpu", 0x100);
for (i = 0; i < NUM_CPU(s); i++) {
s->backref[i] = s;
memory_region_init_io(&s->cpuiomem[i+1], &gic_cpu_ops, &s->backref[i],
"gic_cpu", 0x100);
}
#endif
gic_reset(s);
register_savevm(NULL, "arm_gic", -1, 2, gic_save, gic_load, s);
}