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armv8-bare-metal

Purpose
- It's a bare-metal study in QEMU (-M virt -cpu cortex-a57)

How to run

# export PATH inclueding your cross compile tool
export PATH=$PATH:/home/ryanyao/work/buildroot-2017.11-rc1/output/host/bin
make run

GDB (Terminal 1/2 should be in the same directory.)

Terminal 1:
	qemu-system-aarch64 -machine virt -cpu cortex-a57 -kernel kernel.elf -nographic -S -s
Terminal 2:
	aarch64-linux-gnu-gdb kernel.elf --tui
	target remote :1234

Timer IRQ works. It assert Timer_Handler() every 1 sec.

timer_test
gic_v3_initialize()
init_gicd()
init_gicc()
CurrentEL = 0x00000000 00000004
RVBAR_EL1 = 0x00000000 00000000
VBAR_EL1 = 0x00000000 40000000
DAIF = 0x00000000 000003C0
Disable the timer, CNTV_CTL_EL0 = 0x00000000 00000000
System Frequency: CNTFRQ_EL0 = 0x00000000 03B9ACA0
Current counter: CNTVCT_EL0 = 0x00000000 0001BA16
Assert Timer IRQ after 1 sec: CNTV_CVAL_EL0 = 0x00000000 03BB66B6
Enable the timer, CNTV_CTL_EL0 = 0x00000000 00000001
Enable IRQ, DAIF = 0x00000000 00000340

Exception Handler! (AARCH64_EXC_IRQ_SPX)
IRQ found: 0x00000000 0000001B
timer_handler:
		Disable the timer, CNTV_CTL_EL0 = 0x00000000 00000000
		System Frequency: CNTFRQ_EL0 = 0x00000000 03B9ACA0
		Current counter: CNTVCT_EL0 = 0x00000000 03BD40D5
		Assert Timer IRQ after 0x00000000 00000001 sec(s): CNTV_CVAL_EL0 = 0x00000000 0776ED75
		Enable the timer, CNTV_CTL_EL0 = 0x00000000 00000001

Exception Handler! (AARCH64_EXC_IRQ_SPX)
IRQ found: 0x00000000 0000001B
timer_handler:
		Disable the timer, CNTV_CTL_EL0 = 0x00000000 00000000
		System Frequency: CNTFRQ_EL0 = 0x00000000 03B9ACA0
		Current counter: CNTVCT_EL0 = 0x00000000 0778E288
		Assert Timer IRQ after 0x00000000 00000001 sec(s): CNTV_CVAL_EL0 = 0x00000000 0B328F28
		Enable the timer, CNTV_CTL_EL0 = 0x00000000 00000001

Issues

GDB can't step into main() if miss lable: main_label in boot.S (commit b72c6a8cc7033a4fed89b57f75826d201466179f)
(Fixed, 2018/07/19) Timer IRQ doesn't work(commit b72c6a8cc7033a4fed89b57f75826d201466179f)
- We can see CNTV_CTL_EL0[2]:ISTATUS changes, but irq_handler doesn't be called.
- And we also didn't see any changes in ISR_EL1.
- Solved in commit 2aaa0bff7516e84e01acd10d8de64189839d9d51.
(Fixed, 2018/07/05) It should be some problems in vector_table_el1 in boot.S. If I set "b hang" in other vectors except lower_el_aarch64_irq, the uart outpt will be incorrect or system hang (commit b72c6a8cc7033a4fed89b57f75826d201466179f)
- Root cause should be the stack memory is overlaid. Now, we set stack_top = 0x41000000 to avoid it. (commit c14d653fca24387b5996285f45f0fef2906cb2c9)

Reference

Project
QEMU
- QEMU version 2.12.50 User Documentation
Makefile
ARM
- Arm® Compiler armasm User Guide
- Application Note Bare-metal Boot Code for ARMv8-A Processors Version 1.0
- ARM® Architecture Reference Manual ARMv8, for ARMv8-A architecture profile Beta
- ARM® Cortex®-A57 MPCore™ Processor Revision: r1p0 Technical Reference Manual
- ARM® Cortex®-A Series Version: 1.0 Programmer’s Guide for ARMv8-A
- ARM® Generic Interrupt Controller Architecture Specification GIC architecture version 3.0 and version 4.0

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NienfengYao / armv8-bare-metal

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