aboutsummaryrefslogtreecommitdiff
path: root/hw/intc
diff options
context:
space:
mode:
authorBin Meng <bmeng@tinylab.org>2022-12-11 11:08:22 +0800
committerAlistair Francis <alistair.francis@wdc.com>2023-01-06 10:42:55 +1000
commite8fe2bc11713897453580aa36085556cade63826 (patch)
tree77789bb2265a12a1884dc8eebd5958b82cf82bdf /hw/intc
parent35401578e25caca8b3d94accf3999abf36ea3a4b (diff)
downloadqemu-e8fe2bc11713897453580aa36085556cade63826.zip
qemu-e8fe2bc11713897453580aa36085556cade63826.tar.gz
qemu-e8fe2bc11713897453580aa36085556cade63826.tar.bz2
hw/intc: sifive_plic: Update "num-sources" property default value
At present the default value of "num-sources" property is zero, which does not make a lot of sense, as in sifive_plic_realize() we see s->bitfield_words is calculated by: s->bitfield_words = (s->num_sources + 31) >> 5; if the we don't configure "num-sources" property its default value zero makes s->bitfield_words zero too, which isn't true because interrupt source 0 still occupies one word. Let's change the default value to 1 meaning that only interrupt source 0 is supported by default and a sanity check in realize(). While we are here, add a comment to describe the exact meaning of this property that the number should include interrupt source 0. Signed-off-by: Bin Meng <bmeng@tinylab.org> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20221211030829.802437-9-bmeng@tinylab.org> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'hw/intc')
-rw-r--r--hw/intc/sifive_plic.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/hw/intc/sifive_plic.c b/hw/intc/sifive_plic.c
index 9cb4c6d..1edeb1e 100644
--- a/hw/intc/sifive_plic.c
+++ b/hw/intc/sifive_plic.c
@@ -363,6 +363,11 @@ static void sifive_plic_realize(DeviceState *dev, Error **errp)
parse_hart_config(s);
+ if (!s->num_sources) {
+ error_setg(errp, "plic: invalid number of interrupt sources");
+ return;
+ }
+
s->bitfield_words = (s->num_sources + 31) >> 5;
s->num_enables = s->bitfield_words * s->num_addrs;
s->source_priority = g_new0(uint32_t, s->num_sources);
@@ -420,7 +425,8 @@ static const VMStateDescription vmstate_sifive_plic = {
static Property sifive_plic_properties[] = {
DEFINE_PROP_STRING("hart-config", SiFivePLICState, hart_config),
DEFINE_PROP_UINT32("hartid-base", SiFivePLICState, hartid_base, 0),
- DEFINE_PROP_UINT32("num-sources", SiFivePLICState, num_sources, 0),
+ /* number of interrupt sources including interrupt source 0 */
+ DEFINE_PROP_UINT32("num-sources", SiFivePLICState, num_sources, 1),
DEFINE_PROP_UINT32("num-priorities", SiFivePLICState, num_priorities, 0),
DEFINE_PROP_UINT32("priority-base", SiFivePLICState, priority_base, 0),
DEFINE_PROP_UINT32("pending-base", SiFivePLICState, pending_base, 0),