diff options
Diffstat (limited to 'include/hw')
| -rw-r--r-- | include/hw/arm/armv7m.h | 4 | ||||
| -rw-r--r-- | include/hw/irq.h | 18 |
2 files changed, 21 insertions, 1 deletions
diff --git a/include/hw/arm/armv7m.h b/include/hw/arm/armv7m.h index d2c74d3872..a30e3c6471 100644 --- a/include/hw/arm/armv7m.h +++ b/include/hw/arm/armv7m.h @@ -35,7 +35,9 @@ typedef struct { /* ARMv7M container object. * + Unnamed GPIO input lines: external IRQ lines for the NVIC - * + Named GPIO output SYSRESETREQ: signalled for guest AIRCR.SYSRESETREQ + * + Named GPIO output SYSRESETREQ: signalled for guest AIRCR.SYSRESETREQ. + * If this GPIO is not wired up then the NVIC will default to performing + * a qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET). * + Property "cpu-type": CPU type to instantiate * + Property "num-irq": number of external IRQ lines * + Property "memory": MemoryRegion defining the physical address space diff --git a/include/hw/irq.h b/include/hw/irq.h index 24ba0ece11..dc7abf199e 100644 --- a/include/hw/irq.h +++ b/include/hw/irq.h @@ -55,4 +55,22 @@ qemu_irq qemu_irq_split(qemu_irq irq1, qemu_irq irq2); on an existing vector of qemu_irq. */ void qemu_irq_intercept_in(qemu_irq *gpio_in, qemu_irq_handler handler, int n); +/** + * qemu_irq_is_connected: Return true if IRQ line is wired up + * + * If a qemu_irq has a device on the other (receiving) end of it, + * return true; otherwise return false. + * + * Usually device models don't need to care whether the machine model + * has wired up their outbound qemu_irq lines, because functions like + * qemu_set_irq() silently do nothing if there is nothing on the other + * end of the line. However occasionally a device model will want to + * provide default behaviour if its output is left floating, and + * it can use this function to identify when that is the case. + */ +static inline bool qemu_irq_is_connected(qemu_irq irq) +{ + return irq != NULL; +} + #endif |