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percpu reg store this_task #13726

Merged
merged 3 commits into from
Oct 15, 2024
Merged

percpu reg store this_task #13726

merged 3 commits into from
Oct 15, 2024

Commits on Oct 11, 2024

  1. sched: add up_this_task and up_change_task macro stub 

    reason:
We can utilize percpu storage to hold information about the
current running task. If we intend to implement this feature, we would
need to define two macros that help us manage this percpu information
effectively.

up_this_task: This macro is designed to read the contents of the percpu
              register to retrieve information about the current
              running task.This allows us to quickly access
              task-specific data without having to disable interrupts,
              access global variables and obtain the current cpu index.

up_update_task: This macro is responsible for updating the contents of
                the percpu register.It is typically called during
                initialization or when a context switch occurs to ensure
                that the percpu register reflects the information of the
                newly running task.

Configuring NuttX and compile:
$ ./tools/configure.sh -l qemu-armv8a:nsh_smp
$ make
Running with qemu
$ qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic \
   -machine virt,virtualization=on,gic-version=3 \
   -net none -chardev stdio,id=con,mux=on -serial chardev:con \
   -mon chardev=con,mode=readline -kernel ./nuttx

Signed-off-by: hujun5 <[email protected]>
    @hujun260
    hujun260 committed Oct 11, 2024
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  2. arm64: add up_this_task and up_change_task macro impl 

    Signed-off-by: hujun5 <[email protected]>
    @hujun260
    hujun260 committed Oct 11, 2024
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  3. arm64: we need to initialize the percpu register storing the current … 

    …task more earlier.

A call stack looks like the following:
sched_idletask
syslog_write
nx_vsyslog
syslog
getreg64
gic_validate_redist_version
arm64_gic_init
arm64_gic_secondary_init
arm64_boot_secondary_c_routine

Signed-off-by: hujun5 <[email protected]>
    @hujun260
    hujun260 committed Oct 11, 2024
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