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-rw-r--r--src/dev/arm/RealView.py3
-rw-r--r--src/dev/arm/gic.cc452
-rw-r--r--src/dev/arm/gic.hh75
3 files changed, 378 insertions, 152 deletions
diff --git a/src/dev/arm/RealView.py b/src/dev/arm/RealView.py
index dd694cd45..f913dc94b 100644
--- a/src/dev/arm/RealView.py
+++ b/src/dev/arm/RealView.py
@@ -82,7 +82,8 @@ class Gic(PioDevice):
dist_addr = Param.Addr(0x1f001000, "Address for distributor")
cpu_addr = Param.Addr(0x1f000100, "Address for cpu")
dist_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to distributor")
- cpu_pio_delay = Param.Latency('10ns', "Delay for PIO r/w to cpu")
+ 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)")
class AmbaFake(AmbaDevice):
diff --git a/src/dev/arm/gic.cc b/src/dev/arm/gic.cc
index b4fbb96b1..d8feec49a 100644
--- a/src/dev/arm/gic.cc
+++ b/src/dev/arm/gic.cc
@@ -42,11 +42,10 @@
*/
#include "base/trace.hh"
-#include "cpu/intr_control.hh"
#include "debug/Checkpoint.hh"
#include "debug/GIC.hh"
+#include "debug/IPI.hh"
#include "dev/arm/gic.hh"
-#include "dev/platform.hh"
#include "dev/terminal.hh"
#include "mem/packet.hh"
#include "mem/packet_access.hh"
@@ -54,32 +53,40 @@
Gic::Gic(const Params *p)
: PioDevice(p),distAddr(p->dist_addr), cpuAddr(p->cpu_addr),
distPioDelay(p->dist_pio_delay), cpuPioDelay(p->cpu_pio_delay),
- enabled(false), itLines(p->it_lines)
+ intLatency(p->int_latency), enabled(false), itLines(p->it_lines)
{
itLinesLog2 = ceilLog2(itLines);
- for (int x = 0; x < 8; x++) {
+ for (int x = 0; x < CPU_MAX; x++) {
cpuEnabled[x] = false;
- cpuPriority[x] = 0;
+ cpuPriority[x] = 0xff;
cpuBpr[x] = 0;
// Initialize cpu highest int
cpuHighestInt[x] = SPURIOUS_INT;
+ postIntEvent[x] = new PostIntEvent(x, p->platform);
}
+ DPRINTF(Interrupt, "cpuEnabled[0]=%d cpuEnabled[1]=%d\n", cpuEnabled[0],
+ cpuEnabled[1]);
- for (int x = 0; x < 32; x++) {
+ for (int x = 0; x < INT_BITS_MAX; x++) {
intEnabled[x] = 0;
pendingInt[x] = 0;
activeInt[x] = 0;
}
- for (int x = 0; x < 1020; x++) {
+ for (int x = 0; x < INT_LINES_MAX; x++) {
intPriority[x] = 0;
cpuTarget[x] = 0;
}
- for (int x = 0; x < 64; x++) {
+ for (int x = 0; x < INT_BITS_MAX*2; x++) {
intConfig[x] = 0;
}
+
+ for (int x = 0; x < SGI_MAX; x++) {
+ cpuSgiActive[x] = 0;
+ cpuSgiPending[x] = 0;
+ }
}
Tick
@@ -117,7 +124,7 @@ Gic::readDistributor(PacketPtr pkt)
Addr daddr = pkt->getAddr() - distAddr;
pkt->allocate();
- DPRINTF(Interrupt, "gic distributor read register %#x\n", daddr);
+ DPRINTF(GIC, "gic distributor read register %#x\n", daddr);
if (daddr >= ICDISER_ST && daddr < ICDISER_ED + 4) {
assert((daddr-ICDISER_ST) >> 2 < 32);
@@ -152,9 +159,9 @@ Gic::readDistributor(PacketPtr pkt)
if (daddr >= ICDIPR_ST && daddr < ICDIPR_ED + 4) {
Addr int_num;
int_num = daddr - ICDIPR_ST;
- assert(int_num < 1020);
+ assert(int_num < INT_LINES_MAX);
DPRINTF(Interrupt, "Reading interrupt priority at int# %#x \n",int_num);
- switch(pkt->getSize()){
+ switch(pkt->getSize()) {
case 1:
pkt->set<uint8_t>(intPriority[int_num]);
break;
@@ -169,25 +176,35 @@ Gic::readDistributor(PacketPtr pkt)
intPriority[int_num+3] << 24);
break;
default:
- panic("Invalid access size while reading, priority registers in Gic: %d", pkt->getSize());
+ panic("Invalid size while reading priority regs in GIC: %d\n",
+ pkt->getSize());
}
goto done;
}
if (daddr >= ICDIPTR_ST && daddr < ICDIPTR_ED + 4) {
Addr int_num;
- int_num = (daddr-ICDIPTR_ST) << 2;
- assert(int_num < 1020);
+ int_num = (daddr-ICDIPTR_ST) ;
+ DPRINTF(GIC, "Reading processor target register for int# %#x \n",
+ int_num);
+ assert(int_num < INT_LINES_MAX);
- // First 31 interrupts only target single processor
+ // First 31 interrupts only target single processor (SGI)
if (int_num > 31) {
- pkt->set<uint32_t>(cpuTarget[int_num] |
- cpuTarget[int_num+1] << 8 |
- cpuTarget[int_num+2] << 16 |
- cpuTarget[int_num+3] << 24) ;
+ if (pkt->getSize() == 1) {
+ pkt->set<uint8_t>(cpuTarget[int_num]);
+ } else {
+ assert(pkt->getSize() == 4);
+ int_num = mbits(int_num, 31, 2);
+ pkt->set<uint32_t>(cpuTarget[int_num] |
+ cpuTarget[int_num+1] << 8 |
+ cpuTarget[int_num+2] << 16 |
+ cpuTarget[int_num+3] << 24) ;
+ }
} else {
- /** @todo should be processor id */
- pkt->set<uint32_t>(0);
+ int ctx_id = pkt->req->contextId();
+ assert(ctx_id < sys->numRunningContexts());
+ pkt->set<uint32_t>(ctx_id);
}
goto done;
}
@@ -206,10 +223,9 @@ Gic::readDistributor(PacketPtr pkt)
pkt->set<uint32_t>(enabled);
break;
case ICDICTR:
- /* @todo this needs to refelct the number of CPUs in the system */
uint32_t tmp;
- tmp = 0 << 5 | // cpu number
- (itLines/32 -1);
+ tmp = ((sys->numRunningContexts() - 1) << 5) |
+ (itLines/INT_BITS_MAX -1);
pkt->set<uint32_t>(tmp);
break;
default:
@@ -227,30 +243,59 @@ Gic::readCpu(PacketPtr pkt)
Addr daddr = pkt->getAddr() - cpuAddr;
pkt->allocate();
- DPRINTF(Interrupt, "gic cpu read register %#x\n", daddr);
+ assert(pkt->req->hasContextId());
+ int ctx_id = pkt->req->contextId();
+ assert(ctx_id < sys->numRunningContexts());
+
+ DPRINTF(GIC, "gic cpu read register %#x cpu context: %d\n", daddr,
+ ctx_id);
switch(daddr) {
case ICCICR:
- pkt->set<uint32_t>(cpuEnabled[0]);
+ pkt->set<uint32_t>(cpuEnabled[ctx_id]);
break;
case ICCPMR:
- pkt->set<uint32_t>(cpuPriority[0]);
+ pkt->set<uint32_t>(cpuPriority[ctx_id]);
break;
case ICCBPR:
- pkt->set<uint32_t>(cpuBpr[0]);
+ pkt->set<uint32_t>(cpuBpr[ctx_id]);
break;
case ICCIAR:
- DPRINTF(Interrupt, "CPU reading IAR = %d\n", cpuHighestInt[0]);
- if(enabled && cpuEnabled[0]){
- pkt->set<uint32_t>(cpuHighestInt[0]);
- activeInt[intNumToWord(cpuHighestInt[0])] |=
- 1 << intNumToBit(cpuHighestInt[0]);
- updateRunPri();
- pendingInt[intNumToWord(cpuHighestInt[0])] &=
- ~(1 << intNumToBit(cpuHighestInt[0]));
- cpuHighestInt[0] = SPURIOUS_INT;
+ if (enabled && cpuEnabled[ctx_id]) {
+ int active_int = cpuHighestInt[ctx_id];
+ IAR iar = 0;
+ iar.ack_id = active_int;
+ iar.cpu_id = 0;
+ if (active_int < SGI_MAX) {
+ // this is a software interrupt from another CPU
+ if (!cpuSgiPending[active_int])
+ panic("Interrupt %d active but no CPU generated it?\n",
+ active_int);
+ for (int x = 0; x < CPU_MAX; x++) {
+ // See which CPU generated the interrupt
+ uint8_t cpugen =
+ bits(cpuSgiPending[active_int], 7 + 8 * x, 8 * x);
+ if (cpugen & (1 << ctx_id)) {
+ iar.cpu_id = x;
+ break;
+ }
+ }
+ uint64_t sgi_num = ULL(1) << (ctx_id + 8 * iar.cpu_id);
+ cpuSgiActive[iar.ack_id] |= sgi_num;
+ cpuSgiPending[iar.ack_id] &= ~sgi_num;
+ } else {
+ uint32_t int_num = 1 << intNumToBit(cpuHighestInt[ctx_id]);
+ activeInt[intNumToWord(cpuHighestInt[ctx_id])] |= int_num;
+ updateRunPri();
+ pendingInt[intNumToWord(cpuHighestInt[ctx_id])] &= ~int_num;
+ }
+
+ DPRINTF(Interrupt,"CPU %d reading IAR.id=%d IAR.cpu=%d, iar=0x%x\n",
+ ctx_id, iar.ack_id, iar.cpu_id, iar);
+ cpuHighestInt[ctx_id] = SPURIOUS_INT;
updateIntState(-1);
- platform->intrctrl->clear(0, ArmISA::INT_IRQ, 0);
+ pkt->set<uint32_t>(iar);
+ platform->intrctrl->clear(ctx_id, ArmISA::INT_IRQ, 0);
} else {
pkt->set<uint32_t>(SPURIOUS_INT);
}
@@ -278,58 +323,64 @@ Gic::writeDistributor(PacketPtr pkt)
Addr daddr = pkt->getAddr() - distAddr;
pkt->allocate();
- DPRINTF(Interrupt, "gic distributor write register %#x size %#x\n",
- daddr, pkt->getSize());
+ assert(pkt->req->hasContextId());
+ int ctx_id = pkt->req->contextId();
+
+ DPRINTF(GIC, "gic distributor write register %#x size %#x value %#x \n",
+ daddr, pkt->getSize(), pkt->get<uint32_t>());
if (daddr >= ICDISER_ST && daddr < ICDISER_ED + 4) {
assert((daddr-ICDISER_ST) >> 2 < 32);
- intEnabled[(daddr-ICDISER_ST)>>2] |= pkt->get<uint32_t>();
+ intEnabled[(daddr-ICDISER_ST) >> 2] |= pkt->get<uint32_t>();
goto done;
}
if (daddr >= ICDICER_ST && daddr < ICDICER_ED + 4) {
assert((daddr-ICDICER_ST) >> 2 < 32);
- intEnabled[(daddr-ICDICER_ST)>>2] &= ~pkt->get<uint32_t>();
+ intEnabled[(daddr-ICDICER_ST) >> 2] &= ~pkt->get<uint32_t>();
goto done;
}
if (daddr >= ICDISPR_ST && daddr < ICDISPR_ED + 4) {
assert((daddr-ICDISPR_ST) >> 2 < 32);
- pendingInt[(daddr-ICDISPR_ST)>>2] |= pkt->get<uint32_t>();
- updateIntState((daddr-ICDISPR_ST)>>2);
+ pendingInt[(daddr-ICDISPR_ST) >> 2] |= pkt->get<uint32_t>();
+ pendingInt[0] &= SGI_MASK; // Don't allow SGIs to be changed
+ updateIntState((daddr-ICDISPR_ST) >> 2);
goto done;
}
if (daddr >= ICDICPR_ST && daddr < ICDICPR_ED + 4) {
assert((daddr-ICDICPR_ST) >> 2 < 32);
- pendingInt[(daddr-ICDICPR_ST)>>2] &= ~pkt->get<uint32_t>();
- updateIntState((daddr-ICDICPR_ST)>>2);
+ pendingInt[(daddr-ICDICPR_ST) >> 2] &= ~pkt->get<uint32_t>();
+ pendingInt[0] &= SGI_MASK; // Don't allow SGIs to be changed
+ updateIntState((daddr-ICDICPR_ST) >> 2);
goto done;
}
if (daddr >= ICDIPR_ST && daddr < ICDIPR_ED + 4) {
Addr int_num = daddr - ICDIPR_ST;
- assert(int_num < 1020);
+ assert(int_num < INT_LINES_MAX);
uint32_t tmp;
- switch(pkt->getSize()){
+ switch(pkt->getSize()) {
case 1:
tmp = pkt->get<uint8_t>();
- intPriority[int_num] = tmp & 0xff;
+ intPriority[int_num] = bits(tmp, 7, 0);
break;
case 2:
tmp = pkt->get<uint16_t>();
- intPriority[int_num] = tmp & 0xff;
- intPriority[int_num + 1] = (tmp >> 8) & 0xff;
+ intPriority[int_num] = bits(tmp, 7, 0);
+ intPriority[int_num + 1] = bits(tmp, 15, 8);
break;
case 4:
tmp = pkt->get<uint32_t>();
- intPriority[int_num] = tmp & 0xff;
- intPriority[int_num + 1] = (tmp >> 8) & 0xff;
- intPriority[int_num + 2] = (tmp >> 16) & 0xff;
- intPriority[int_num + 3] = (tmp >> 24) & 0xff;
+ intPriority[int_num] = bits(tmp, 7, 0);
+ intPriority[int_num + 1] = bits(tmp, 15, 8);
+ intPriority[int_num + 2] = bits(tmp, 23, 16);
+ intPriority[int_num + 3] = bits(tmp, 31, 24);
break;
default:
- panic("Invalid access size while writing to, priority registers in Gic: %d", pkt->getSize());
+ panic("Invalid size when writing to priority regs in Gic: %d\n",
+ pkt->getSize());
}
updateIntState(-1);
@@ -338,16 +389,22 @@ Gic::writeDistributor(PacketPtr pkt)
}
if (daddr >= ICDIPTR_ST && daddr < ICDIPTR_ED + 4) {
- Addr int_num = (daddr-ICDIPTR_ST) << 2;
- assert(int_num < 1020);
-
+ Addr int_num = (daddr-ICDIPTR_ST) ;
+ assert(int_num < INT_LINES_MAX);
// First 31 interrupts only target single processor
- if (int_num > 31) {
- uint32_t tmp = pkt->get<uint32_t>();
- cpuTarget[int_num] = tmp & 0xff;
- cpuTarget[int_num+1] = (tmp >> 8) & 0xff;
- cpuTarget[int_num+2] = (tmp >> 16) & 0xff;
- cpuTarget[int_num+3] = (tmp >> 24) & 0xff;
+ if (int_num >= SGI_MAX) {
+ if (pkt->getSize() == 1) {
+ uint8_t tmp = pkt->get<uint8_t>();
+ cpuTarget[int_num] = tmp & 0xff;
+ } else {
+ assert (pkt->getSize() == 4);
+ int_num = mbits(int_num, 31, 2);
+ uint32_t tmp = pkt->get<uint32_t>();
+ cpuTarget[int_num] = bits(tmp, 7, 0);
+ cpuTarget[int_num+1] = bits(tmp, 15, 8);
+ cpuTarget[int_num+2] = bits(tmp, 23, 16);
+ cpuTarget[int_num+3] = bits(tmp, 31, 24);
+ }
updateIntState((daddr-ICDIPTR_ST)>>2);
}
goto done;
@@ -356,6 +413,8 @@ Gic::writeDistributor(PacketPtr pkt)
if (daddr >= ICDICFR_ST && daddr < ICDICFR_ED + 4) {
assert((daddr-ICDICFR_ST) >> 2 < 64);
intConfig[(daddr-ICDICFR_ST)>>2] = pkt->get<uint32_t>();
+ if (pkt->get<uint32_t>() & NN_CONFIG_MASK)
+ warn("GIC N:N mode selected and not supported at this time\n");
goto done;
}
@@ -365,7 +424,7 @@ Gic::writeDistributor(PacketPtr pkt)
DPRINTF(Interrupt, "Distributor enable flag set to = %d\n", enabled);
break;
case ICDSGIR:
- softInt(pkt->get<uint32_t>());
+ softInt(ctx_id, pkt->get<uint32_t>());
break;
default:
panic("Tried to write Gic distributor at offset %#x\n", daddr);
@@ -383,97 +442,181 @@ Gic::writeCpu(PacketPtr pkt)
Addr daddr = pkt->getAddr() - cpuAddr;
pkt->allocate();
- DPRINTF(Interrupt, "gic cpu write register %#x val: %#x\n",
- daddr, pkt->get<uint32_t>());
+ assert(pkt->req->hasContextId());
+ int ctx_id = pkt->req->contextId();
+ IAR iar;
+
+ DPRINTF(GIC, "gic cpu write register cpu:%d %#x val: %#x\n",
+ ctx_id, daddr, pkt->get<uint32_t>());
switch(daddr) {
case ICCICR:
- cpuEnabled[0] = pkt->get<uint32_t>();
- updateIntState(-1);
+ cpuEnabled[ctx_id] = pkt->get<uint32_t>();
break;
case ICCPMR:
- cpuPriority[0] = pkt->get<uint32_t>();
- updateIntState(-1);
+ cpuPriority[ctx_id] = pkt->get<uint32_t>();
break;
case ICCBPR:
- cpuBpr[0] = pkt->get<uint32_t>();
- updateIntState(-1);
+ cpuBpr[ctx_id] = pkt->get<uint32_t>();
break;
case ICCEOIR:
- uint32_t tmp;
- tmp = pkt->get<uint32_t>();
- if (!(activeInt[intNumToWord(tmp)] & (1 << intNumToBit(tmp))))
- panic("Done handling interrupt that isn't active?\n");
- activeInt[intNumToWord(tmp)] &= ~(1 << intNumToBit(tmp));
+ iar = pkt->get<uint32_t>();
+ if (iar.ack_id < SGI_MAX) {
+ // Clear out the bit that corrseponds to the cleared int
+ uint64_t clr_int = ULL(1) << (ctx_id + 8 * iar.cpu_id);
+ if (!(cpuSgiActive[iar.ack_id] & clr_int))
+ panic("Done handling a SGI that isn't active?\n");
+ cpuSgiActive[iar.ack_id] &= ~clr_int;
+ } else {
+ uint32_t int_num = 1 << intNumToBit(iar.ack_id);
+ if (!(activeInt[intNumToWord(iar.ack_id)] & int_num))
+ panic("Done handling interrupt that isn't active?\n");
+ activeInt[intNumToWord(iar.ack_id)] &= ~int_num;
+ }
updateRunPri();
- DPRINTF(Interrupt, "CPU done handling interrupt IAR = %d\n", tmp);
+ DPRINTF(Interrupt, "CPU %d done handling intr IAR = %d from cpu %d\n",
+ ctx_id, iar.ack_id, iar.cpu_id);
break;
default:
panic("Tried to write Gic cpu at offset %#x\n", daddr);
break;
}
+ if (cpuEnabled[ctx_id]) updateIntState(-1);
pkt->makeAtomicResponse();
return cpuPioDelay;
}
void
-Gic::softInt(SWI swi)
+Gic::softInt(int ctx_id, SWI swi)
{
- warn("Should be causing software interrupt");
+ switch (swi.list_type) {
+ case 1:
+ // interrupt all
+ uint8_t cpu_list;
+ cpu_list = 0;
+ for (int x = 0; x < CPU_MAX; x++)
+ cpu_list |= cpuEnabled[x] ? 1 << x : 0;
+ swi.cpu_list = cpu_list;
+ break;
+ case 2:
+ // interrupt requesting cpu only
+ swi.cpu_list = 1 << ctx_id;
+ break;
+ // else interrupt cpus specified
+ }
+
+ DPRINTF(IPI, "Generating softIRQ from CPU %d for %#x\n", ctx_id,
+ swi.cpu_list);
+ for (int i = 0; i < CPU_MAX; i++) {
+ DPRINTF(IPI, "Processing CPU %d\n", i);
+ if (!cpuEnabled[i])
+ continue;
+ if (swi.cpu_list & (1 << i))
+ cpuSgiPending[swi.sgi_id] |= (1 << i) << (8 * ctx_id);
+ DPRINTF(IPI, "SGI[%d]=%#x\n", swi.sgi_id, cpuSgiPending[swi.sgi_id]);
+ }
+ updateIntState(-1);
+}
+
+uint64_t
+Gic::genSwiMask(int cpu)
+{
+ if (cpu > 7)
+ panic("Invalid CPU ID\n");
+ return ULL(0x0101010101010101) << cpu;
}
void
Gic::updateIntState(int hint)
{
- /*@todo use hint to do less work. */
- int highest_int = SPURIOUS_INT;
- // Priorities below that set in ICCPMR can be ignored
- uint8_t highest_pri = cpuPriority[0];
-
- for (int x = 0; x < (itLines/32) ; x++) {
- if (intEnabled[x] & pendingInt[x]) {
- for (int y = 0; y < 32; y++) {
- if (bits(intEnabled[x], y) & bits(pendingInt[x], y))
- if (intPriority[x*32+y] < highest_pri) {
- highest_pri = intPriority[x*32+y];
- highest_int = x*32 + y;
- }
+ for (int cpu = 0; cpu < CPU_MAX; cpu++) {
+ if (!cpuEnabled[cpu])
+ continue;
+ if (cpu >= sys->numContexts())
+ break;
+
+ /*@todo use hint to do less work. */
+ int highest_int = SPURIOUS_INT;
+ // Priorities below that set in ICCPMR can be ignored
+ uint8_t highest_pri = cpuPriority[cpu];
+
+ // Check SGIs
+ for (int swi = 0; swi < SGI_MAX; swi++) {
+ if (!cpuSgiPending[swi])
+ continue;
+ if (cpuSgiPending[swi] & genSwiMask(cpu))
+ if (highest_pri > intPriority[swi]) {
+ highest_pri = intPriority[swi];
+ highest_int = swi;
+ }
+ }
+
+ bool mp_sys = sys->numRunningContexts() > 1;
+ // Check other ints
+ for (int x = 0; x < (itLines/INT_BITS_MAX) ; x++) {
+ if (intEnabled[x] & pendingInt[x]) {
+ for (int y = 0; y < INT_BITS_MAX; y++) {
+ uint32_t int_nm = x * INT_BITS_MAX + y;
+ DPRINTF(GIC, "Checking for interrupt# %d \n",int_nm);
+ /* Set current pending int as highest int for current cpu
+ if the interrupt's priority higher than current prioirty
+ and if currrent cpu is the target (for mp configs only)
+ */
+ if ((bits(intEnabled[x], y) & bits(pendingInt[x], y)) &&
+ (intPriority[int_nm] < highest_pri))
+ if (mp_sys || (cpuTarget[int_nm] & (1 << cpu))) {
+ highest_pri = intPriority[int_nm];
+ highest_int = int_nm;
+ }
+ }
}
}
- }
- if (highest_int == SPURIOUS_INT)
- return;
+ cpuHighestInt[cpu] = highest_int;
- cpuHighestInt[0] = highest_int;
+ if (highest_int == SPURIOUS_INT)
+ continue;
+ /* @todo make this work for more than one cpu, need to handle 1:N, N:N
+ * models */
+ if (enabled && cpuEnabled[cpu] && (highest_pri < cpuPriority[cpu]) &&
+ !(activeInt[intNumToWord(highest_int)]
+ & (1 << intNumToBit(highest_int)))) {
- /* @todo make this work for more than one cpu, need to handle 1:N, N:N
- * models */
- if (enabled && cpuEnabled[0] && (highest_pri < cpuPriority[0])) {
- /* @todo delay interrupt by some time to deal with calculation delay */
- /* @todo only interrupt if we've haven't already interrupted for this
- * int !!!!!!!!!! */
- DPRINTF(Interrupt, "Posting interrupt %d to cpu0\n", highest_int);
- platform->intrctrl->post(0, ArmISA::INT_IRQ, 0);
+ DPRINTF(Interrupt, "Posting interrupt %d to cpu%d\n", highest_int,
+ cpu);
+ postInt(cpu, curTick() + intLatency);
+ }
}
}
void
Gic::updateRunPri()
{
- uint8_t maxPriority = 0xff;
- for (int i = 0 ; i < itLines ; i++){
- if ( activeInt[intNumToWord(i)] & (1 << intNumToBit(i))){
- if (intPriority[i] < maxPriority) maxPriority = intPriority[i];
+ for (int cpu = 0; cpu < CPU_MAX; cpu++) {
+ uint8_t maxPriority = 0xff;
+ for (int i = 0 ; i < itLines ; i++){
+ if (i < SGI_MAX) {
+ if ((cpuSgiActive[i] & genSwiMask(cpu)) &&
+ (intPriority[i] < maxPriority))
+ maxPriority = intPriority[i];
+ } else {
+ if (activeInt[intNumToWord(i)] & (1 << intNumToBit(i)))
+ if (intPriority[i] < maxPriority)
+ maxPriority = intPriority[i];
+ }
}
+ iccrpr[cpu] = maxPriority;
}
- iccrpr[0] = maxPriority;
}
+
void
Gic::sendInt(uint32_t num)
{
- DPRINTF(Interrupt, "Received Interupt number %d\n", num);
+ DPRINTF(Interrupt, "Received Interupt number %d, cpuTarget %#x: \n",
+ num, cpuTarget[num]);
+ if (cpuTarget[num] & (cpuTarget[num] - 1))
+ panic("Multiple targets for peripheral interrupts is not supported\n");
pendingInt[intNumToWord(num)] |= 1 << intNumToBit(num);
updateIntState(intNumToWord(num));
@@ -486,6 +629,13 @@ Gic::clearInt(uint32_t number)
}
void
+Gic::postInt(uint32_t cpu, Tick when)
+{
+ if (!(postIntEvent[cpu]->scheduled()))
+ eventq->schedule(postIntEvent[cpu], when);
+}
+
+void
Gic::addressRanges(AddrRangeList &range_list)
{
range_list.clear();
@@ -506,18 +656,29 @@ Gic::serialize(std::ostream &os)
SERIALIZE_SCALAR(enabled);
SERIALIZE_SCALAR(itLines);
SERIALIZE_SCALAR(itLinesLog2);
- SERIALIZE_ARRAY(intEnabled, 32);
- SERIALIZE_ARRAY(pendingInt, 32);
- SERIALIZE_ARRAY(activeInt, 32);
- SERIALIZE_ARRAY(iccrpr, 8);
- SERIALIZE_ARRAY(intPriority, 1020);
- SERIALIZE_ARRAY(cpuTarget, 1020);
- SERIALIZE_ARRAY(intConfig, 64);
- SERIALIZE_ARRAY(cpuEnabled, 8);
- SERIALIZE_ARRAY(cpuPriority, 8);
- SERIALIZE_ARRAY(cpuBpr, 8);
- SERIALIZE_ARRAY(cpuHighestInt, 8);
+ SERIALIZE_ARRAY(intEnabled, INT_BITS_MAX);
+ SERIALIZE_ARRAY(pendingInt, INT_BITS_MAX);
+ SERIALIZE_ARRAY(activeInt, INT_BITS_MAX);
+ SERIALIZE_ARRAY(iccrpr, CPU_MAX);
+ SERIALIZE_ARRAY(intPriority, INT_LINES_MAX);
+ SERIALIZE_ARRAY(cpuTarget, INT_LINES_MAX);
+ SERIALIZE_ARRAY(intConfig, INT_BITS_MAX * 2);
+ SERIALIZE_ARRAY(cpuEnabled, CPU_MAX);
+ SERIALIZE_ARRAY(cpuPriority, CPU_MAX);
+ SERIALIZE_ARRAY(cpuBpr, CPU_MAX);
+ SERIALIZE_ARRAY(cpuHighestInt, CPU_MAX);
+ SERIALIZE_ARRAY(cpuSgiActive, SGI_MAX);
+ SERIALIZE_ARRAY(cpuSgiPending, SGI_MAX);
SERIALIZE_SCALAR(irqEnable);
+ Tick interrupt_time[CPU_MAX];
+ for (uint32_t cpu = 0; cpu < CPU_MAX; cpu++) {
+ interrupt_time[cpu] = 0;
+ if (postIntEvent[cpu]->scheduled()) {
+ interrupt_time[cpu] = postIntEvent[cpu]->when();
+ }
+ }
+ SERIALIZE_ARRAY(interrupt_time, CPU_MAX);
+
}
void
@@ -532,18 +693,29 @@ Gic::unserialize(Checkpoint *cp, const std::string &section)
UNSERIALIZE_SCALAR(enabled);
UNSERIALIZE_SCALAR(itLines);
UNSERIALIZE_SCALAR(itLinesLog2);
- UNSERIALIZE_ARRAY(intEnabled, 32);
- UNSERIALIZE_ARRAY(pendingInt, 32);
- UNSERIALIZE_ARRAY(activeInt, 32);
- UNSERIALIZE_ARRAY(iccrpr, 8);
- UNSERIALIZE_ARRAY(intPriority, 1020);
- UNSERIALIZE_ARRAY(cpuTarget, 1020);
- UNSERIALIZE_ARRAY(intConfig, 64);
- UNSERIALIZE_ARRAY(cpuEnabled, 8);
- UNSERIALIZE_ARRAY(cpuPriority, 8);
- UNSERIALIZE_ARRAY(cpuBpr, 8);
- UNSERIALIZE_ARRAY(cpuHighestInt, 8);
+ UNSERIALIZE_ARRAY(intEnabled, INT_BITS_MAX);
+ UNSERIALIZE_ARRAY(pendingInt, INT_BITS_MAX);
+ UNSERIALIZE_ARRAY(activeInt, INT_BITS_MAX);
+ UNSERIALIZE_ARRAY(iccrpr, CPU_MAX);
+ UNSERIALIZE_ARRAY(intPriority, INT_LINES_MAX);
+ UNSERIALIZE_ARRAY(cpuTarget, INT_LINES_MAX);
+ UNSERIALIZE_ARRAY(intConfig, INT_BITS_MAX * 2);
+ UNSERIALIZE_ARRAY(cpuEnabled, CPU_MAX);
+ UNSERIALIZE_ARRAY(cpuPriority, CPU_MAX);
+ UNSERIALIZE_ARRAY(cpuBpr, CPU_MAX);
+ UNSERIALIZE_ARRAY(cpuHighestInt, CPU_MAX);
+ UNSERIALIZE_ARRAY(cpuSgiActive, SGI_MAX);
+ UNSERIALIZE_ARRAY(cpuSgiPending, SGI_MAX);
UNSERIALIZE_SCALAR(irqEnable);
+
+ Tick interrupt_time[CPU_MAX];
+ UNSERIALIZE_ARRAY(interrupt_time, CPU_MAX);
+
+ for (uint32_t cpu = 0; cpu < CPU_MAX; cpu++) {
+ if (interrupt_time[cpu])
+ schedule(postIntEvent[cpu], interrupt_time[cpu]);
+ }
+
}
Gic *
@@ -557,8 +729,8 @@ void
Gic::driveSPI(unsigned int spiVect)
{
DPRINTF(GIC, "Received SPI Vector:%x Enable: %d\n", spiVect, irqEnable);
- if( irqEnable && enabled ){
- pendingInt[1] |= spiVect;
+ pendingInt[1] |= spiVect;
+ if (irqEnable && enabled) {
updateIntState(-1);
}
}
@@ -567,13 +739,15 @@ void
Gic::driveIrqEn( bool state)
{
irqEnable = state;
+ DPRINTF(GIC, " Enabling Irq\n");
+ updateIntState(-1);
}
void
Gic::driveLegIRQ(bool state)
{
- if (irqEnable && !(!enabled && cpuEnabled[0])){
- if(state){
+ if (irqEnable && !(!enabled && cpuEnabled[0])) {
+ if (state) {
DPRINTF(GIC, "Driving Legacy Irq\n");
platform->intrctrl->post(0, ArmISA::INT_IRQ, 0);
}
diff --git a/src/dev/arm/gic.hh b/src/dev/arm/gic.hh
index 83b89f060..ea498bca1 100644
--- a/src/dev/arm/gic.hh
+++ b/src/dev/arm/gic.hh
@@ -51,6 +51,8 @@
#include "base/bitunion.hh"
#include "base/range.hh"
#include "dev/io_device.hh"
+#include "dev/platform.hh"
+#include "cpu/intr_control.hh"
#include "params/Gic.hh"
/** @todo this code only assumes one processor for now. Low word
@@ -97,7 +99,18 @@ class Gic : public PioDevice
static const int ICCIIDR = 0xfc; // cpu interface id register
static const int CPU_SIZE = 0xff;
+ static const int SGI_MAX = 16; // Number of Software Gen Interrupts
+
+ /** Mask off SGI's when setting/clearing pending bits */
+ static const int SGI_MASK = 0xFFFF0000;
+
+ /** Mask for bits that config N:N mode in ICDICFR's */
+ static const int NN_CONFIG_MASK = 0x55555555;
+
+ static const int CPU_MAX = 8; // Max number of supported CPU interfaces
static const int SPURIOUS_INT = 1023;
+ static const int INT_BITS_MAX = 32;
+ static const int INT_LINES_MAX = 1020;
BitUnion32(SWI)
Bitfield<3,0> sgi_id;
@@ -105,6 +118,11 @@ class Gic : public PioDevice
Bitfield<25,24> list_type;
EndBitUnion(SWI)
+ BitUnion32(IAR)
+ Bitfield<9,0> ack_id;
+ Bitfield<12,10> cpu_id;
+ EndBitUnion(IAR)
+
/** Distributor address GIC listens at */
Addr distAddr;
@@ -118,6 +136,9 @@ class Gic : public PioDevice
/** Latency for a cpu operation */
Tick cpuPioDelay;
+ /** Latency for a interrupt to get to CPU */
+ Tick intLatency;
+
/** Gic enabled */
bool enabled;
@@ -128,44 +149,51 @@ class Gic : public PioDevice
/** interrupt enable bits for all possible 1020 interupts.
* one bit per interrupt, 32 bit per word = 32 words */
- uint32_t intEnabled[32];
+ uint32_t intEnabled[INT_BITS_MAX];
/** interrupt pending bits for all possible 1020 interupts.
* one bit per interrupt, 32 bit per word = 32 words */
- uint32_t pendingInt[32];
+ uint32_t pendingInt[INT_BITS_MAX];
/** interrupt active bits for all possible 1020 interupts.
* one bit per interrupt, 32 bit per word = 32 words */
- uint32_t activeInt[32];
+ uint32_t activeInt[INT_BITS_MAX];
/** read only running priroity register, 1 per cpu*/
- uint32_t iccrpr[8];
+ uint32_t iccrpr[CPU_MAX];
/** an 8 bit priority (lower is higher priority) for each
* of the 1020 possible supported interrupts.
*/
- uint8_t intPriority[1020];
+ uint8_t intPriority[INT_LINES_MAX];
/** an 8 bit cpu target id for each shared peripheral interrupt
* of the 1020 possible supported interrupts.
*/
- uint8_t cpuTarget[1020];
+ uint8_t cpuTarget[INT_LINES_MAX];
/** 2 bit per interrupt signaling if it's level or edge sensitive
* and if it is 1:N or N:N */
- uint32_t intConfig[64];
+ uint32_t intConfig[INT_BITS_MAX*2];
/** CPU enabled */
- bool cpuEnabled[8];
+ bool cpuEnabled[CPU_MAX];
/** CPU priority */
- uint8_t cpuPriority[8];
+ uint8_t cpuPriority[CPU_MAX];
/** Binary point registers */
- uint8_t cpuBpr[8];
+ uint8_t cpuBpr[CPU_MAX];
/** highest interrupt that is interrupting CPU */
- uint32_t cpuHighestInt[8];
+ uint32_t cpuHighestInt[CPU_MAX];
+
+ /** One bit per cpu per software interrupt that is pending for each possible
+ * sgi source. Indexed by SGI number. Each byte in generating cpu id and
+ * bits in position is destination id. e.g. 0x4 = CPU 0 generated interrupt
+ * for CPU 2. */
+ uint64_t cpuSgiPending[SGI_MAX];
+ uint64_t cpuSgiActive[SGI_MAX];
/** IRQ Enable Used for debug */
bool irqEnable;
@@ -173,7 +201,7 @@ class Gic : public PioDevice
/** software generated interrupt
* @param data data to decode that indicates which cpus to interrupt
*/
- void softInt(SWI swi);
+ void softInt(int ctx_id, SWI swi);
/** See if some processor interrupt flags need to be enabled/disabled
* @param hint which set of interrupts needs to be checked
@@ -184,9 +212,28 @@ class Gic : public PioDevice
* active interrupt*/
void updateRunPri();
+ /** generate a bit mask to check cpuSgi for an interrupt. */
+ uint64_t genSwiMask(int cpu);
+
int intNumToWord(int num) const { return num >> 5; }
int intNumToBit(int num) const { return num % 32; }
+ /** Event definition to post interrupt to CPU after a delay
+ */
+ class PostIntEvent : public Event
+ {
+ private:
+ uint32_t cpu;
+ Platform *platform;
+ public:
+ PostIntEvent( uint32_t c, Platform* p)
+ : cpu(c), platform(p)
+ { }
+ void process() { platform->intrctrl->post(cpu, ArmISA::INT_IRQ, 0);}
+ const char *description() const { return "Post Interrupt to CPU"; }
+ };
+ PostIntEvent *postIntEvent[CPU_MAX];
+
public:
typedef GicParams Params;
const Params *
@@ -242,6 +289,10 @@ class Gic : public PioDevice
* @param number number of interrupt to send */
void clearInt(uint32_t number);
+ /** Post an interrupt to a CPU
+ */
+ void postInt(uint32_t cpu, Tick when);
+
/* Various functions fer testing and debugging */
void driveSPI(uint32_t spi);
void driveLegIRQ(bool state);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-05 16:16:07 +0000