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hw/mips_cmgcr: implement RESET_BASE register in CM GCR

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Implement RESET_BASE register which is local to each VP and a write to
it changes VP's reset exception base. Also, add OTHER register to
allow a software running on one VP to access other VP's local registers.

Guest can use this mechanism to specify custom address from which a VP
will start execution.

Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
This commit is contained in:
Leon Alrae 2016-06-09 10:46:52 +01:00
parent dff94251f0
commit c09199fe73
2 changed files with 71 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

54
hw/misc/mips_cmgcr.c
View file

@ -59,6 +59,8 @@ static inline void update_gic_base(MIPSGCRState *gcr, uint64_t val)
static uint64_t gcr_read(void *opaque, hwaddr addr, unsigned size)
{
MIPSGCRState *gcr = (MIPSGCRState *) opaque;
MIPSGCRVPState *current_vps = &gcr->vps[current_cpu->cpu_index];
MIPSGCRVPState *other_vps = &gcr->vps[current_vps->other];
switch (addr) {
/* Global Control Block Register */
@ -85,8 +87,14 @@ static uint64_t gcr_read(void *opaque, hwaddr addr, unsigned size)
case MIPS_COCB_OFS + GCR_CL_CONFIG_OFS:
/* Set PVP to # of VPs - 1 */
return gcr->num_vps - 1;
case MIPS_CLCB_OFS + GCR_CL_RESETBASE_OFS:
return current_vps->reset_base;
case MIPS_COCB_OFS + GCR_CL_RESETBASE_OFS:
return other_vps->reset_base;
case MIPS_CLCB_OFS + GCR_CL_OTHER_OFS:
return 0;
return current_vps->other;
case MIPS_COCB_OFS + GCR_CL_OTHER_OFS:
return other_vps->other;
default:
qemu_log_mask(LOG_UNIMP, "Read %d bytes at GCR offset 0x%" HWADDR_PRIx
"\n", size, addr);
@ -95,10 +103,18 @@ static uint64_t gcr_read(void *opaque, hwaddr addr, unsigned size)
return 0;
}
static inline target_ulong get_exception_base(MIPSGCRVPState *vps)
{
/* TODO: BEV_BASE and SELECT_BEV */
return (int32_t)(vps->reset_base & GCR_CL_RESET_BASE_RESETBASE_MSK);
}
/* Write GCR registers */
static void gcr_write(void *opaque, hwaddr addr, uint64_t data, unsigned size)
{
MIPSGCRState *gcr = (MIPSGCRState *)opaque;
MIPSGCRVPState *current_vps = &gcr->vps[current_cpu->cpu_index];
MIPSGCRVPState *other_vps = &gcr->vps[current_vps->other];
switch (addr) {
case GCR_GIC_BASE_OFS:
@ -107,6 +123,26 @@ static void gcr_write(void *opaque, hwaddr addr, uint64_t data, unsigned size)
case GCR_CPC_BASE_OFS:
update_cpc_base(gcr, data);
break;
case MIPS_CLCB_OFS + GCR_CL_RESETBASE_OFS:
current_vps->reset_base = data & GCR_CL_RESET_BASE_MSK;
cpu_set_exception_base(current_cpu->cpu_index,
get_exception_base(current_vps));
break;
case MIPS_COCB_OFS + GCR_CL_RESETBASE_OFS:
other_vps->reset_base = data & GCR_CL_RESET_BASE_MSK;
cpu_set_exception_base(current_vps->other,
get_exception_base(other_vps));
break;
case MIPS_CLCB_OFS + GCR_CL_OTHER_OFS:
if ((data & GCR_CL_OTHER_MSK) < gcr->num_vps) {
current_vps->other = data & GCR_CL_OTHER_MSK;
}
break;
case MIPS_COCB_OFS + GCR_CL_OTHER_OFS:
if ((data & GCR_CL_OTHER_MSK) < gcr->num_vps) {
other_vps->other = data & GCR_CL_OTHER_MSK;
}
break;
default:
qemu_log_mask(LOG_UNIMP, "Write %d bytes at GCR offset 0x%" HWADDR_PRIx
" 0x%" PRIx64 "\n", size, addr, data);
@ -148,9 +184,16 @@ static void mips_gcr_init(Object *obj)
static void mips_gcr_reset(DeviceState *dev)
{
MIPSGCRState *s = MIPS_GCR(dev);
int i;
update_gic_base(s, 0);
update_cpc_base(s, 0);
for (i = 0; i < s->num_vps; i++) {
s->vps[i].other = 0;
s->vps[i].reset_base = 0xBFC00000 & GCR_CL_RESET_BASE_MSK;
cpu_set_exception_base(i, get_exception_base(&s->vps[i]));
}
}
static const VMStateDescription vmstate_mips_gcr = {
@ -170,12 +213,21 @@ static Property mips_gcr_properties[] = {
DEFINE_PROP_END_OF_LIST(),
};
static void mips_gcr_realize(DeviceState *dev, Error **errp)
{
MIPSGCRState *s = MIPS_GCR(dev);
/* Create local set of registers for each VP */
s->vps = g_new(MIPSGCRVPState, s->num_vps);
}
static void mips_gcr_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = mips_gcr_properties;
dc->vmsd = &vmstate_mips_gcr;
dc->reset = mips_gcr_reset;
dc->realize = mips_gcr_realize;
}
static const TypeInfo mips_gcr_info = {