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The new amd64efi BSP supports:
- multiboot2 boot format. Runs well with GRUB.
- console based on either EFI simple text output or GOP-based framebuffer
- clock based on EFI event/timer API
- early console using either hard-wired PC-AT serial or just memory buffer
- with EFI support disabled the BSP is more or less equivalent to amd64 BSP
with multiboot2 support
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Update #3706.
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The APIC timer is calibrated by running the i8254 PIT for a fraction of a
second (determined by PIT_CALIBRATE_DIVIDER) and counting how many times the
APIC counter has ticked. The calibration can be run multiple times (determined
by APIC_TIMER_NUM_CALIBRATIONS) and averaged out.
Updates #2898.
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Current state:
- Basic context initialization and switching code.
- Stubbed console (empty functions).
- Mostly functional linker script (may need tweaks if we ever want to move
away from the large code model (see: CPU_CFLAGS).
- Fully functional boot, by using FreeBSD's bootloader to load RTEMS's ELF for
UEFI-awareness.
In short, the current state with this commit lets us boot, go through the system
initialization functions, and then call user application's Init task too.
Updates #2898.
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