* armv7m_nvic device.
*/
+#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "gic_internal.h"
+#include "qapi/error.h"
#include "qom/cpu.h"
//#define DEBUG_GIC
#define DPRINTF(fmt, ...) do {} while(0)
#endif
-static const uint8_t gic_id[] = {
- 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1
+static const uint8_t gic_id_11mpcore[] = {
+ 0x00, 0x00, 0x00, 0x00, 0x90, 0x13, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1
};
-#define NUM_CPU(s) ((s)->num_cpu)
+static const uint8_t gic_id_gicv1[] = {
+ 0x04, 0x00, 0x00, 0x00, 0x90, 0xb3, 0x1b, 0x00, 0x0d, 0xf0, 0x05, 0xb1
+};
+
+static const uint8_t gic_id_gicv2[] = {
+ 0x04, 0x00, 0x00, 0x00, 0x90, 0xb4, 0x2b, 0x00, 0x0d, 0xf0, 0x05, 0xb1
+};
static inline int gic_get_current_cpu(GICState *s)
{
int cpu;
int cm;
- for (cpu = 0; cpu < NUM_CPU(s); cpu++) {
+ for (cpu = 0; cpu < s->num_cpu; cpu++) {
cm = 1 << cpu;
s->current_pending[cpu] = 1023;
if (!(s->ctlr & (GICD_CTLR_EN_GRP0 | GICD_CTLR_EN_GRP1))
return pending_irq;
}
-static void gic_set_running_irq(GICState *s, int cpu, int irq)
+static int gic_get_group_priority(GICState *s, int cpu, int irq)
{
- s->running_irq[cpu] = irq;
- if (irq == 1023) {
- s->running_priority[cpu] = 0x100;
+ /* Return the group priority of the specified interrupt
+ * (which is the top bits of its priority, with the number
+ * of bits masked determined by the applicable binary point register).
+ */
+ int bpr;
+ uint32_t mask;
+
+ if (gic_has_groups(s) &&
+ !(s->cpu_ctlr[cpu] & GICC_CTLR_CBPR) &&
+ GIC_TEST_GROUP(irq, (1 << cpu))) {
+ bpr = s->abpr[cpu];
} else {
- s->running_priority[cpu] = GIC_GET_PRIORITY(irq, cpu);
+ bpr = s->bpr[cpu];
}
- gic_update(s);
+
+ /* a BPR of 0 means the group priority bits are [7:1];
+ * a BPR of 1 means they are [7:2], and so on down to
+ * a BPR of 7 meaning no group priority bits at all.
+ */
+ mask = ~0U << ((bpr & 7) + 1);
+
+ return GIC_GET_PRIORITY(irq, cpu) & mask;
+}
+
+static void gic_activate_irq(GICState *s, int cpu, int irq)
+{
+ /* Set the appropriate Active Priority Register bit for this IRQ,
+ * and update the running priority.
+ */
+ int prio = gic_get_group_priority(s, cpu, irq);
+ int preemption_level = prio >> (GIC_MIN_BPR + 1);
+ int regno = preemption_level / 32;
+ int bitno = preemption_level % 32;
+
+ if (gic_has_groups(s) && GIC_TEST_GROUP(irq, (1 << cpu))) {
+ s->nsapr[regno][cpu] |= (1 << bitno);
+ } else {
+ s->apr[regno][cpu] |= (1 << bitno);
+ }
+
+ s->running_priority[cpu] = prio;
+ GIC_SET_ACTIVE(irq, 1 << cpu);
+}
+
+static int gic_get_prio_from_apr_bits(GICState *s, int cpu)
+{
+ /* Recalculate the current running priority for this CPU based
+ * on the set bits in the Active Priority Registers.
+ */
+ int i;
+ for (i = 0; i < GIC_NR_APRS; i++) {
+ uint32_t apr = s->apr[i][cpu] | s->nsapr[i][cpu];
+ if (!apr) {
+ continue;
+ }
+ return (i * 32 + ctz32(apr)) << (GIC_MIN_BPR + 1);
+ }
+ return 0x100;
+}
+
+static void gic_drop_prio(GICState *s, int cpu, int group)
+{
+ /* Drop the priority of the currently active interrupt in the
+ * specified group.
+ *
+ * Note that we can guarantee (because of the requirement to nest
+ * GICC_IAR reads [which activate an interrupt and raise priority]
+ * with GICC_EOIR writes [which drop the priority for the interrupt])
+ * that the interrupt we're being called for is the highest priority
+ * active interrupt, meaning that it has the lowest set bit in the
+ * APR registers.
+ *
+ * If the guest does not honour the ordering constraints then the
+ * behaviour of the GIC is UNPREDICTABLE, which for us means that
+ * the values of the APR registers might become incorrect and the
+ * running priority will be wrong, so interrupts that should preempt
+ * might not do so, and interrupts that should not preempt might do so.
+ */
+ int i;
+
+ for (i = 0; i < GIC_NR_APRS; i++) {
+ uint32_t *papr = group ? &s->nsapr[i][cpu] : &s->apr[i][cpu];
+ if (!*papr) {
+ continue;
+ }
+ /* Clear lowest set bit */
+ *papr &= *papr - 1;
+ break;
+ }
+
+ s->running_priority[cpu] = gic_get_prio_from_apr_bits(s, cpu);
}
uint32_t gic_acknowledge_irq(GICState *s, int cpu, MemTxAttrs attrs)
* for the case where this GIC supports grouping and the pending interrupt
* is in the wrong group.
*/
- irq = gic_get_current_pending_irq(s, cpu, attrs);;
+ irq = gic_get_current_pending_irq(s, cpu, attrs);
if (irq >= GIC_MAXIRQ) {
DPRINTF("ACK, no pending interrupt or it is hidden: %d\n", irq);
DPRINTF("ACK, pending interrupt (%d) has insufficient priority\n", irq);
return 1023;
}
- s->last_active[irq][cpu] = s->running_irq[cpu];
if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) {
/* Clear pending flags for both level and edge triggered interrupts.
}
}
- gic_set_running_irq(s, cpu, irq);
+ gic_activate_irq(s, cpu, irq);
+ gic_update(s);
DPRINTF("ACK %d\n", irq);
return ret;
}
}
}
+/* Return true if we should split priority drop and interrupt deactivation,
+ * ie whether the relevant EOIMode bit is set.
+ */
+static bool gic_eoi_split(GICState *s, int cpu, MemTxAttrs attrs)
+{
+ if (s->revision != 2) {
+ /* Before GICv2 prio-drop and deactivate are not separable */
+ return false;
+ }
+ if (s->security_extn && !attrs.secure) {
+ return s->cpu_ctlr[cpu] & GICC_CTLR_EOIMODE_NS;
+ }
+ return s->cpu_ctlr[cpu] & GICC_CTLR_EOIMODE;
+}
+
+static void gic_deactivate_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs)
+{
+ int cm = 1 << cpu;
+ int group = gic_has_groups(s) && GIC_TEST_GROUP(irq, cm);
+
+ if (!gic_eoi_split(s, cpu, attrs)) {
+ /* This is UNPREDICTABLE; we choose to ignore it */
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "gic_deactivate_irq: GICC_DIR write when EOIMode clear");
+ return;
+ }
+
+ if (s->security_extn && !attrs.secure && !group) {
+ DPRINTF("Non-secure DI for Group0 interrupt %d ignored\n", irq);
+ return;
+ }
+
+ GIC_CLEAR_ACTIVE(irq, cm);
+}
+
void gic_complete_irq(GICState *s, int cpu, int irq, MemTxAttrs attrs)
{
- int update = 0;
int cm = 1 << cpu;
+ int group;
+
DPRINTF("EOI %d\n", irq);
if (irq >= s->num_irq) {
/* This handles two cases:
*/
return;
}
- if (s->running_irq[cpu] == 1023)
+ if (s->running_priority[cpu] == 0x100) {
return; /* No active IRQ. */
+ }
if (s->revision == REV_11MPCORE || s->revision == REV_NVIC) {
/* Mark level triggered interrupts as pending if they are still
&& GIC_TEST_LEVEL(irq, cm) && (GIC_TARGET(irq) & cm) != 0) {
DPRINTF("Set %d pending mask %x\n", irq, cm);
GIC_SET_PENDING(irq, cm);
- update = 1;
}
}
- if (s->security_extn && !attrs.secure && !GIC_TEST_GROUP(irq, cm)) {
+ group = gic_has_groups(s) && GIC_TEST_GROUP(irq, cm);
+
+ if (s->security_extn && !attrs.secure && !group) {
DPRINTF("Non-secure EOI for Group0 interrupt %d ignored\n", irq);
return;
}
* i.e. go ahead and complete the irq anyway.
*/
- if (irq != s->running_irq[cpu]) {
- /* Complete an IRQ that is not currently running. */
- int tmp = s->running_irq[cpu];
- while (s->last_active[tmp][cpu] != 1023) {
- if (s->last_active[tmp][cpu] == irq) {
- s->last_active[tmp][cpu] = s->last_active[irq][cpu];
- break;
- }
- tmp = s->last_active[tmp][cpu];
- }
- if (update) {
- gic_update(s);
- }
- } else {
- /* Complete the current running IRQ. */
- gic_set_running_irq(s, cpu, s->last_active[s->running_irq[cpu]][cpu]);
+ gic_drop_prio(s, cpu, group);
+
+ /* In GICv2 the guest can choose to split priority-drop and deactivate */
+ if (!gic_eoi_split(s, cpu, attrs)) {
+ GIC_CLEAR_ACTIVE(irq, cm);
}
+ gic_update(s);
}
static uint32_t gic_dist_readb(void *opaque, hwaddr offset, MemTxAttrs attrs)
if (offset == 4)
/* Interrupt Controller Type Register */
return ((s->num_irq / 32) - 1)
- | ((NUM_CPU(s) - 1) << 5)
+ | ((s->num_cpu - 1) << 5)
| (s->security_extn << 10);
if (offset < 0x08)
return 0;
}
res = s->sgi_pending[irq][cpu];
- } else if (offset < 0xfe0) {
+ } else if (offset < 0xfd0) {
goto bad_reg;
- } else /* offset >= 0xfe0 */ {
+ } else if (offset < 0x1000) {
if (offset & 3) {
res = 0;
} else {
- res = gic_id[(offset - 0xfe0) >> 2];
+ switch (s->revision) {
+ case REV_11MPCORE:
+ res = gic_id_11mpcore[(offset - 0xfd0) >> 2];
+ break;
+ case 1:
+ res = gic_id_gicv1[(offset - 0xfd0) >> 2];
+ break;
+ case 2:
+ res = gic_id_gicv2[(offset - 0xfd0) >> 2];
+ break;
+ case REV_NVIC:
+ /* Shouldn't be able to get here */
+ abort();
+ default:
+ res = 0;
+ }
}
+ } else {
+ g_assert_not_reached();
}
return res;
bad_reg:
}
}
-static const MemoryRegionOps gic_dist_ops = {
- .read_with_attrs = gic_dist_read,
- .write_with_attrs = gic_dist_write,
- .endianness = DEVICE_NATIVE_ENDIAN,
-};
+static inline uint32_t gic_apr_ns_view(GICState *s, int cpu, int regno)
+{
+ /* Return the Nonsecure view of GICC_APR<regno>. This is the
+ * second half of GICC_NSAPR.
+ */
+ switch (GIC_MIN_BPR) {
+ case 0:
+ if (regno < 2) {
+ return s->nsapr[regno + 2][cpu];
+ }
+ break;
+ case 1:
+ if (regno == 0) {
+ return s->nsapr[regno + 1][cpu];
+ }
+ break;
+ case 2:
+ if (regno == 0) {
+ return extract32(s->nsapr[0][cpu], 16, 16);
+ }
+ break;
+ case 3:
+ if (regno == 0) {
+ return extract32(s->nsapr[0][cpu], 8, 8);
+ }
+ break;
+ default:
+ g_assert_not_reached();
+ }
+ return 0;
+}
+
+static inline void gic_apr_write_ns_view(GICState *s, int cpu, int regno,
+ uint32_t value)
+{
+ /* Write the Nonsecure view of GICC_APR<regno>. */
+ switch (GIC_MIN_BPR) {
+ case 0:
+ if (regno < 2) {
+ s->nsapr[regno + 2][cpu] = value;
+ }
+ break;
+ case 1:
+ if (regno == 0) {
+ s->nsapr[regno + 1][cpu] = value;
+ }
+ break;
+ case 2:
+ if (regno == 0) {
+ s->nsapr[0][cpu] = deposit32(s->nsapr[0][cpu], 16, 16, value);
+ }
+ break;
+ case 3:
+ if (regno == 0) {
+ s->nsapr[0][cpu] = deposit32(s->nsapr[0][cpu], 8, 8, value);
+ }
+ break;
+ default:
+ g_assert_not_reached();
+ }
+}
static MemTxResult gic_cpu_read(GICState *s, int cpu, int offset,
uint64_t *data, MemTxAttrs attrs)
}
break;
case 0xd0: case 0xd4: case 0xd8: case 0xdc:
- *data = s->apr[(offset - 0xd0) / 4][cpu];
+ {
+ int regno = (offset - 0xd0) / 4;
+
+ if (regno >= GIC_NR_APRS || s->revision != 2) {
+ *data = 0;
+ } else if (s->security_extn && !attrs.secure) {
+ /* NS view of GICC_APR<n> is the top half of GIC_NSAPR<n> */
+ *data = gic_apr_ns_view(s, regno, cpu);
+ } else {
+ *data = s->apr[regno][cpu];
+ }
+ break;
+ }
+ case 0xe0: case 0xe4: case 0xe8: case 0xec:
+ {
+ int regno = (offset - 0xe0) / 4;
+
+ if (regno >= GIC_NR_APRS || s->revision != 2 || !gic_has_groups(s) ||
+ (s->security_extn && !attrs.secure)) {
+ *data = 0;
+ } else {
+ *data = s->nsapr[regno][cpu];
+ }
break;
+ }
default:
qemu_log_mask(LOG_GUEST_ERROR,
"gic_cpu_read: Bad offset %x\n", (int)offset);
}
break;
case 0xd0: case 0xd4: case 0xd8: case 0xdc:
- qemu_log_mask(LOG_UNIMP, "Writing APR not implemented\n");
+ {
+ int regno = (offset - 0xd0) / 4;
+
+ if (regno >= GIC_NR_APRS || s->revision != 2) {
+ return MEMTX_OK;
+ }
+ if (s->security_extn && !attrs.secure) {
+ /* NS view of GICC_APR<n> is the top half of GIC_NSAPR<n> */
+ gic_apr_write_ns_view(s, regno, cpu, value);
+ } else {
+ s->apr[regno][cpu] = value;
+ }
+ break;
+ }
+ case 0xe0: case 0xe4: case 0xe8: case 0xec:
+ {
+ int regno = (offset - 0xe0) / 4;
+
+ if (regno >= GIC_NR_APRS || s->revision != 2) {
+ return MEMTX_OK;
+ }
+ if (!gic_has_groups(s) || (s->security_extn && !attrs.secure)) {
+ return MEMTX_OK;
+ }
+ s->nsapr[regno][cpu] = value;
+ break;
+ }
+ case 0x1000:
+ /* GICC_DIR */
+ gic_deactivate_irq(s, cpu, value & 0x3ff, attrs);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR,
return gic_cpu_write(s, id, addr, value, attrs);
}
-static const MemoryRegionOps gic_thiscpu_ops = {
- .read_with_attrs = gic_thiscpu_read,
- .write_with_attrs = gic_thiscpu_write,
- .endianness = DEVICE_NATIVE_ENDIAN,
+static const MemoryRegionOps gic_ops[2] = {
+ {
+ .read_with_attrs = gic_dist_read,
+ .write_with_attrs = gic_dist_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ },
+ {
+ .read_with_attrs = gic_thiscpu_read,
+ .write_with_attrs = gic_thiscpu_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ }
};
static const MemoryRegionOps gic_cpu_ops = {
.endianness = DEVICE_NATIVE_ENDIAN,
};
+/* This function is used by nvic model */
void gic_init_irqs_and_distributor(GICState *s)
{
- SysBusDevice *sbd = SYS_BUS_DEVICE(s);
- int i;
-
- i = s->num_irq - GIC_INTERNAL;
- /* For the GIC, also expose incoming GPIO lines for PPIs for each CPU.
- * GPIO array layout is thus:
- * [0..N-1] SPIs
- * [N..N+31] PPIs for CPU 0
- * [N+32..N+63] PPIs for CPU 1
- * ...
- */
- if (s->revision != REV_NVIC) {
- i += (GIC_INTERNAL * s->num_cpu);
- }
- qdev_init_gpio_in(DEVICE(s), gic_set_irq, i);
- for (i = 0; i < NUM_CPU(s); i++) {
- sysbus_init_irq(sbd, &s->parent_irq[i]);
- }
- for (i = 0; i < NUM_CPU(s); i++) {
- sysbus_init_irq(sbd, &s->parent_fiq[i]);
- }
- memory_region_init_io(&s->iomem, OBJECT(s), &gic_dist_ops, s,
- "gic_dist", 0x1000);
+ gic_init_irqs_and_mmio(s, gic_set_irq, gic_ops);
}
static void arm_gic_realize(DeviceState *dev, Error **errp)
return;
}
- gic_init_irqs_and_distributor(s);
+ /* This creates distributor and main CPU interface (s->cpuiomem[0]) */
+ gic_init_irqs_and_mmio(s, gic_set_irq, gic_ops);
- /* 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", ...
+ /* Extra core-specific regions for the CPU interfaces. This is
+ * necessary for "franken-GIC" implementations, for example on
+ * Exynos 4.
* 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], OBJECT(s), &gic_thiscpu_ops, s,
- "gic_cpu", 0x100);
- for (i = 0; i < NUM_CPU(s); i++) {
+ for (i = 0; i < s->num_cpu; i++) {
s->backref[i] = s;
memory_region_init_io(&s->cpuiomem[i+1], OBJECT(s), &gic_cpu_ops,
&s->backref[i], "gic_cpu", 0x100);
- }
- /* Distributor */
- sysbus_init_mmio(sbd, &s->iomem);
- /* cpu interfaces (one for "current cpu" plus one per cpu) */
- for (i = 0; i <= NUM_CPU(s); i++) {
- sysbus_init_mmio(sbd, &s->cpuiomem[i]);
+ sysbus_init_mmio(sbd, &s->cpuiomem[i+1]);
}
}
Code Review / kvmfornfv.git / blobdiff