talos-op-linux/arch/xtensa/boot, branch master

xtensa: add XIP kernel support

2019-11-26T19:33:38+00:00

XIP (eXecute In Place) kernel image is the image that can be run directly from ROM, using RAM only for writable data. XIP xtensa kernel differs from regular xtensa kernel in the following ways: - it has exception/IRQ vectors merged into text section. No vectors relocation takes place at kernel startup. - .data/.bss location must be specified in the kernel configuration, its content is copied there in the _startup function. - .init.text is merged with the rest of text and is executed from ROM. - when MMU is used the virtual address where the kernel will be mapped must be specified in the kernel configuration. It may be in the KSEG or in the KIO, __pa macro is adjusted to be able to handle both. Signed-off-by: Max Filippov

xtensa: virt: fix PCI IO ports mapping

2019-10-15T21:29:53+00:00

virt device tree incorrectly uses 0xf0000000 on both sides of PCI IO ports address space mapping. This results in incorrect port address assignment in PCI IO BARs and subsequent crash on attempt to access them. Use 0 as base address in PCI IO ports address space. Signed-off-by: Max Filippov

xtensa: virt: move PCI root complex to KIO range

2019-09-02T07:09:30+00:00

Move PCI configuration space, MMIO and memory to the KIO range to free vmalloc area and use static TLB to access them. Move MMIO to the beginning of KIO and define PCI_IOBASE as XCHAL_KIO_BYPASS_VADDR to match it. Reduce number of supported PCI buses to 0x3f so that ECAM window fits into first 64MB of the KIO. Reduce size of the PCI memory window to 128MB so that it fits into KIO. Signed-off-by: Max Filippov

Merge tag 'xtensa-20190715' of git://github.com/jcmvbkbc/linux-xtensa

2019-07-16T19:17:07+00:00

Pull Xtensa updates from Max Filippov: - clean up PCI support code - add defconfig and DTS for the 'virt' board - abstract 'entry' and 'retw' uses in xtensa assembly in preparation for XEA3/NX pipeline support - random small cleanups * tag 'xtensa-20190715' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: virt: add defconfig and DTS xtensa: abstract 'entry' and 'retw' in assembly code xtensa: One function call less in bootmem_init() xtensa: remove arch/xtensa/include/asm/types.h xtensa: use generic pcibios_set_master and pcibios_enable_device xtensa: drop dead PCI support code xtensa/PCI: Remove unused variable

xtensa: virt: add defconfig and DTS

2019-07-08T21:32:06+00:00

Add defconfig and DTS for a virt board. Defconfig enables PCIe host and a number of virtio devices. DTS routes legacy PCI IRQs to the first four level-triggered external IRQ lines. CPU core with edge-triggered IRQs among the first four may need a custom DTS to work correctly. Signed-off-by: Max Filippov

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500

2019-06-19T15:09:55+00:00

Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Enrico Weigelt Reviewed-by: Kate Stewart Reviewed-by: Allison Randal Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman

treewide: prefix header search paths with $(srctree)/

2019-05-18T02:49:57+00:00

Currently, the Kbuild core manipulates header search paths in a crazy way [1]. To fix this mess, I want all Makefiles to add explicit $(srctree)/ to the search paths in the srctree. Some Makefiles are already written in that way, but not all. The goal of this work is to make the notation consistent, and finally get rid of the gross hacks. Having whitespaces after -I does not matter since commit 48f6e3cf5bc6 ("kbuild: do not drop -I without parameter"). [1]: https://patchwork.kernel.org/patch/9632347/ Signed-off-by: Masahiro Yamada

xtensa: replace variant/core.h with asm/core.h

2019-05-07T00:48:55+00:00

Introduce the header arch/xtensa/include/asm/core.h that provides definitions for XCHAL macros missing in older xtensa releases. Use this header instead of variant/core.h Signed-off-by: Max Filippov

xtensa: rename BUILTIN_DTB to BUILTIN_DTB_SOURCE

2019-01-26T10:02:16+00:00

When building some xtensa config, I hit the following warning: drivers/staging/mt7621-dts/Kconfig:4:warning: 'BUILTIN_DTB' has wrong type. 'select' only accept arguments of bool and tristate type It is due to some arch use BUILTIN_DTB as a flag for the need to builtin dtb but xtensa use it as a string for which dtb to bulltin. But for this (which dtb to build), it is better to use BUILTIN_DTB_SOURCE like other arch do. Signed-off-by: Corentin Labbe Signed-off-by: Max Filippov

xtensa: don't use l32r opcode directly

2018-12-05T20:53:07+00:00

xtensa assembler is capable of representing register loads with either movi + addmi, l32r or const16, depending on the core configuration. Don't use '.literal' and 'l32r' directly in the code, use 'movi' and let the assembler relax them. Signed-off-by: Max Filippov