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dev, arm: Add a flag to enable/disable gem5 GIC extensions

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Make it possible to disable gem5 gic extensions by setting the
gem5_extensions param to False from Python.

Change-Id: Icb255105925ef49891d69cc9fe5cc55578ca066d
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Geoffrey Blake <geoffrey.blake@arm.com>
This commit is contained in:
Andreas Sandberg 2016-05-26 11:56:24 +01:00
parent d023b7e8db
commit 4d577ac8f1
3 changed files with 15 additions and 9 deletions
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1
src/dev/arm/Gic.py
View file

@ -59,6 +59,7 @@ class Pl390(BaseGic):
cpu_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to cpu interface")
int_latency = Param.Latency('10ns', "Delay for interrupt to get to CPU")
it_lines = Param.UInt32(128, "Number of interrupt lines supported (max = 1020)")
gem5_extensions = Param.Bool(True, "Enable gem5 extensions")
class Gicv2mFrame(SimObject):
type = 'Gicv2mFrame'

20
src/dev/arm/gic_pl390.cc
View file

@ -55,7 +55,8 @@ Pl390::Pl390(const Params *p)
: BaseGic(p), distAddr(p->dist_addr),
cpuAddr(p->cpu_addr), distPioDelay(p->dist_pio_delay),
cpuPioDelay(p->cpu_pio_delay), intLatency(p->int_latency),
enabled(false), itLines(p->it_lines), irqEnable(false)
enabled(false), itLines(p->it_lines),
haveGem5Extensions(p->gem5_extensions), irqEnable(false)
{
itLinesLog2 = ceilLog2(itLines);
@ -258,17 +259,16 @@ Pl390::readDistributor(PacketPtr pkt)
case GICD_CTLR:
pkt->set<uint32_t>(enabled);
break;
case GICD_TYPER:
uint32_t tmp;
tmp = ((sys->numRunningContexts() - 1) << 5) |
(itLines/INT_BITS_MAX -1) |
0x100;
case GICD_TYPER: {
/* The 0x100 is a made-up flag to show that gem5 extensions
* are available,
* write 0x200 to this register to enable it.
*/
uint32_t tmp = ((sys->numRunningContexts() - 1) << 5) |
(itLines/INT_BITS_MAX -1) |
(haveGem5Extensions ? 0x100 : 0x0);
pkt->set<uint32_t>(tmp);
break;
} break;
default:
panic("Tried to read Gic distributor at offset %#x\n", daddr);
break;
@ -502,8 +502,10 @@ Pl390::writeDistributor(PacketPtr pkt)
/* 0x200 is a made-up flag to enable gem5 extension functionality.
* This reg is not normally written.
*/
gem5ExtensionsEnabled = !!(pkt->get<uint32_t>() & 0x200);
DPRINTF(GIC, "gem5 extensions %s\n", gem5ExtensionsEnabled ? "enabled" : "disabled");
gem5ExtensionsEnabled = (
(pkt->get<uint32_t>() & 0x200) && haveGem5Extensions);
DPRINTF(GIC, "gem5 extensions %s\n",
gem5ExtensionsEnabled ? "enabled" : "disabled");
break;
case GICD_SGIR:
softInt(ctx_id, pkt->get<uint32_t>());

3
src/dev/arm/gic_pl390.hh
View file

@ -157,6 +157,9 @@ class Pl390 : public BaseGic
uint32_t itLinesLog2;
/** Are gem5 extensions available? */
const bool haveGem5Extensions;
/** interrupt enable bits for all possible 1020 interupts.
* one bit per interrupt, 32 bit per word = 32 words */
uint32_t intEnabled[INT_BITS_MAX];