cmake: boards: make QEMU icount sleep parameter configurable
When QEMU is running in icount mode, the behaviour regarding the CPU being in sleep mode is configurable, with the default value being set to 'off'. In this case, instruction counting continues even when the CPU is sleeping or no target time is set in the system timer. If the sleep parameter is set to 'on', instruction counting stops if the CPU is sleeping, and the instruction count will fast-forward directly to the next target time once it is being set. In the Xilinx derivative of QEMU (which simulates ZynqMP and Zynq-7000 SoCs), the default configuration causes QEMU to no longer accept control commands via the console or remotely whenever Zephyr enters and remains in idle mode. Therefore, this commit makes the value of the sleep para- meter of the icount functionality configurable, with the default value remaining 'off'. The value can be changed at board level alongside with the specification of the icount shift value. Signed-off-by: Immo Birnbaum <Immo.Birnbaum@Weidmueller.com>
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3 changed files with 21 additions and 2 deletions
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@ -54,6 +54,17 @@ config QEMU_ICOUNT_SHIFT
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The virtual CPU will execute one instruction every 2^N nanoseconds
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of virtual time, where N is the value provided here.
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config QEMU_ICOUNT_SLEEP
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bool "QEMU icount sleep mode enable"
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depends on QEMU_ICOUNT
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help
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When the virtual CPU is sleeping, the virtual time will advance
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at default speed unless this option is set. With this option set,
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the virtual time will jump to the next timer deadline instantly
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whenever the virtual CPU goes to sleep mode and will not advance
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if no timer is enabled. This behavior gives deterministic execution
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times from the guest point of view.
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config QEMU_IVSHMEM_PLAIN_MEM_SIZE
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int "QEMU ivshmem-plain shared memory size in mega-bytes"
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default 1
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@ -71,7 +71,9 @@ endif # NETWORKING
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if QEMU_ICOUNT
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config QEMU_ICOUNT_SHIFT
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default 3
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default 8
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config QEMU_ICOUNT_SLEEP
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default y
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endif # QEMU_ICOUNT
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@ -74,9 +74,15 @@ endif()
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list(APPEND QEMU_FLAGS -mon chardev=con,mode=readline)
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if(CONFIG_QEMU_ICOUNT)
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list(APPEND QEMU_FLAGS
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if(CONFIG_QEMU_ICOUNT_SLEEP)
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list(APPEND QEMU_FLAGS
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-icount shift=${CONFIG_QEMU_ICOUNT_SHIFT},align=off,sleep=on
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-rtc clock=vm)
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else()
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list(APPEND QEMU_FLAGS
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-icount shift=${CONFIG_QEMU_ICOUNT_SHIFT},align=off,sleep=off
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-rtc clock=vm)
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endif()
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endif()
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# Add a BT serial device when building for bluetooth, unless the
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