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init/main: Add trace points for logging boot time on x86 #8

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Merged
rbradford merged 1 commit into from
Jan 28, 2022
Merged

init/main: Add trace points for logging boot time on x86 #8

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -5,4 +5,4 @@ Contains patches for:
* virtio-iommu from https://jpbrucker.net/git/linux/log/?h=virtio-iommu/acpi (7616abe11cd1e0224bbd150626564db70bb07c31)
* Support for virtio-watchdog
* Bug fix: to support using ACPI reboot rather than EFI reboot

* Log boot time via debug port `0x80` on x86 (details: https://github.com/cloud-hypervisor/cloud-hypervisor/blob/main/docs/debug-port.md)
8 changes: 8 additions & 0 deletions init/main.c
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Expand Up @@ -935,6 +935,10 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
char *command_line;
char *after_dashes;

#ifdef CONFIG_X86
outb(0x40, 0x80);
#endif

set_task_stack_end_magic(&init_task);
smp_setup_processor_id();
debug_objects_early_init();
Expand Down Expand Up @@ -1528,6 +1532,10 @@ static int __ref kernel_init(void *unused)

do_sysctl_args();

#ifdef CONFIG_X86
outb(0x41, 0x80);
#endif

if (ramdisk_execute_command) {
ret = run_init_process(ramdisk_execute_command);
if (!ret)
Expand Down