Cherry pick arm64 EL3 support for Imx9 from upstream #257
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putreg32() arguments were swapped. Signed-off-by: Eero Nurkkala <[email protected]>
This provides means to run NuttX completely in EL3. This may be useful with NuttX based bootloaders that are executed from OCRAM. Instead of SPL/U-boot combo, NuttX may replace SPL completely. Signed-off-by: Eero Nurkkala <[email protected]>
Currently MMU supports only EL1. Introduce EL3 support as well. Signed-off-by: Eero Nurkkala <[email protected]>
Value 1021, when read from ICC_IAR0_EL1 means: "The GIC returns this value in response to a read of ICC_IAR0_EL1 or ICC_HPPIR0_EL1 at EL3, to indicate that the interrupt being acknowledged is one which is expected to be handled at Non-secure EL1 or EL2. This INTID is only returned when the PE is executing at EL3 using AArch64 state, or when the PE is executing in AArch32 state in Monitor mode." When this happens: - FIQ is fired on group0 - IRQ is pending at group1 So simply check and handle the interrupt. In short, this provides interrupt support for EL3. Signed-off-by: Eero Nurkkala <[email protected]>
This provides a capable bootloader that may be run from OCRAM. The OCRAM contains regions that are always zero, so the linker file avoids those with best effort. iMX9 infrastructure expects: - 0x20480000 (Start of OCRAM, AHAB) - 0x2049a000 (NuttX or SPL) - 0x204e0000 (ARM Trustzone, not used) When started from SD-card, the offsets are: - 0x1f000 with AHAB - 0xa000 without AHAB Signed-off-by: Eero Nurkkala <[email protected]>
Search and replace ARCH_BOOT_EL3 with more generic ARCH_ARM64_EXCEPTION_LEVEL that holds the EL level in an integer variable. Signed-off-by: Eero Nurkkala <[email protected]>
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Upstream commits cherry picked