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2018-09-10riscv: update misaligned memory access exception handlingXiang Wang
Support for more situations: floating point, compressed instructions, etc. Add support for redirect exception to S-Mode. Change-Id: I9983d56245eab1d458a84cb1432aeb805df7a49f Signed-off-by: Xiang Wang <wxjstz@126.com> Reviewed-on: https://review.coreboot.org/27972 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
2018-02-20arch/riscv: Update encoding.h and adjust related codeJonathan Neuschäfer
Update encoding.h to the version shipped with spike commit 0185d36 ("Merge pull request #165 from riscv/small_progbuf"), and copy the license header from the LICENSE file. Change-Id: I517042e5865986e88a589dc8623745f8d584d6b8 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/23773 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-12-02riscv: Remove config string supportJonathan Neuschäfer
The code dealing with the old config string isn't needed anymore, because the config string has been deprecated in favor of OpenFirmware-derived devicetrees. Change-Id: I71398fb4861dbaf7eefc6e6f222bb7159798fafa Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/22594 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-12-02arch/riscv: Remove the current SBI implementationJonathan Neuschäfer
This Supervisor Binary Interface, which is based on a page of code that's provided to operating systems by the M-mode software, has been superseded by a different (currently not really documented) SBI, which is based on directly executing ECALLs instructions. Thus some of our code becomes obsolete. Just rip it out until we implement the new SBI. Change-Id: Iec9c20b750f39a2b8f1553e25865bbf150605a6d Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/22593 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-12-02arch/riscv: Return from trap_handler instead of jumping outJonathan Neuschäfer
Change-Id: I8dbed5dbe377d3a02e58a3bc16a1ee112b28bea9 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/21764 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-12-02arch/riscv: Unify trap returnJonathan Neuschäfer
Change-Id: I9de0c92b3f925e8f4db00d7281222a07db68b2ae Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/21763 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-11-07arch/riscv: gettimer: Don't use the config stringJonathan Neuschäfer
Accessing the config string doesn't work anymore on current versions of spike. Thus return dummy pointers until we have a better solution. Change-Id: I684fc51dc0916f2235e57e36b913d363e1cb02b1 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/21687 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-09-27arch/riscv: trap handler: Print load/store access width in bitsJonathan Neuschäfer
This is easier to read than the raw shift amount that's extracted from load/store instructions. Change-Id: Ia16ab9fbaf55345b654ea65e65267ed900eb29e1 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/21654 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-06-07src: change coreboot to lowercaseMartin Roth
The word 'coreboot' should always be written in lowercase, even at the start of a sentence. Change-Id: I7945ddb988262e7483da4e623cedf972380e65a2 Signed-off-by: Martin Roth <martinroth@google.com> Reviewed-on: https://review.coreboot.org/20029 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com> Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2017-01-16riscv: Move mcall numbers to mcall.h, adjust their namesJonathan Neuschäfer
The new name and location make more sense: - The instruction used to call into machine mode isn't called "ecall" anymore; it's mcall now. - Having SBI_ in the name is slightly wrong, too: these numbers are not part of the Supervisor Binary Interface, they are just used to forward SBI calls (they could be renumbered arbitrarily without breaking an OS that's run under coreboot). Also remove mcall_dev_{req,resp} and the corresponding mcall numbers, which are no longer used. Change-Id: I76a8cb04e4ace51964b1cb4f67d49cfee9850da7 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/18146 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2017-01-16riscv: get SBI calls to workRonald G. Minnich
SBI calls, as it turned out, were never right. They did not set the stack correctly on traps. They were not correctly setting the MIP instead of the SIP (although this was not really well documented). On Harvey, we were trying to avoid using them, and due to a bug in SPIKE, our avoidance worked. Once SPIKE was fixed, our avoidance broke. This set of changes is tested and working with Harvey which, for the first time, is making SBI calls. It's not pretty and we're going to want to rework trap_util.S in coming days. Change-Id: Ibef530adcc58d33e2c44ff758e0b7d2acbdc5e99 Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/18097 Tested-by: build bot (Jenkins)
2016-12-18riscv: Add support for timer interruptsRonald G. Minnich
RISCV requires that timer interrupts be handled in machine mode and delegated as necessary. Also you can only reset the timer interrupt by writing to mtimecmp. Further, you must write a number > mtime, not just != mtime. This rather clumsy situation requires that we write some value into the future into mtimecmp lest we never be able to leave machine mode as the interrupt either is not cleared or instantly reoccurs. This current code is tested and works for harvey (Plan 9) timer interrupts. Change-Id: I8538d5fd8d80d9347773c638f5cbf0da18dc1cae Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-on: https://review.coreboot.org/17807 Tested-by: build bot (Jenkins) Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
2016-11-07riscv: Unify SBI call implementations under arch/riscv/Jonathan Neuschäfer
Note that currently, traps are only handled by the trap handler installed in the bootblock. The romstage and ramstage don't override it. TEST=Booted emulation/spike-qemu and lowrisc/nexys4ddr with a linux payload. It worked as much as before (Linux didn't boot, but it made some successful SBI calls) Change-Id: Icce96ab3f41ae0f34bd86e30f9ff17c30317854e Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/17057 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-11-02riscv: Add a bandaid for the new toolchainRonald G. Minnich
After I did a new toolchain build, I found the the mhartid register value is wrong for Spike. The docs seem to agree with Spike, not the code the toolchain produces? Until such time as the bitstreams and toolchain can find a way to agree, just hardcode it. We've been playing this game for two years now so this is hardly a new approach. This is intentionally ugly because we really need the toolchains and emulators and bitstreams to sync up, and that's not happening yet. Lowrisc allegedly implements the v1.9 spec but it's PTEs are clearly 1.7. Once it all settles down we can just use constants supplied by the toolchain. I hope the syncup will have happened by the workshop in November. This gets spike running again. Change-Id: If259bcb6b6320ef01ed29a20ce3d2dcfd0bc7326 Signed-off-by: Ronald G. Minnich <rminnich@gmail.com> Reviewed-on: https://review.coreboot.org/17183 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
2016-10-18arch/riscv: In trap handler, don't print SP twiceJonathan Neuschäfer
The stack pointer (SP) is already printed in print_trap_information. Don't print it again in handle_misaligned_{load,store}. Change-Id: I156cf5734a16605decc2280e54e6db3089e094a2 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16996 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
2016-10-15arch/riscv: Visually align trap frame informationJonathan Neuschäfer
The pointers printed on unaligned memory accesses are now aligned to those printed at the end of print_trap_information. Change-Id: Ifec1cb639036ce61b81fe8d0a9b14c00d5b2781a Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16983 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-10-15riscv and power8: Convert printk/while(1) to dieJonathan Neuschäfer
Change-Id: I277cc9ae22cd33f2cd9ded808960349d09e8670d Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16984 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-08-29arch/riscv: Add missing "break;"Jonathan Neuschäfer
Change-Id: Iea3f12a5a7eb37586f5424db2d7a84c4319492f8 Reported-by: Coverity (1361947) Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16335 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>
2016-08-23arch/riscv: Implement the SBI againJonathan Neuschäfer
Not all SBI calls are implemented, but it's enough to see a couple dozen lines of Linux boot output. It should also be noted that the SBI is still in flux: https://groups.google.com/a/groups.riscv.org/forum/#!topic/sw-dev/6oNhlW0OFKM Change-Id: I80e4fe508336d6428ca7136bc388fbc3cda4f1e4 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16119 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-08-23arch/riscv: Fix unaligned memory access emulationJonathan Neuschäfer
Change-Id: I06c6493355f25f3780f75e345c517b434912696f Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16261 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-08-15arch/riscv: Improve and refactor trap handling diagnosticsJonathan Neuschäfer
Change-Id: I57032f958c88ea83a420e93b459df4f620799d84 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/16016 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-07-19arch/riscv: Enable unaligned load handlingJonathan Neuschäfer
Change-Id: If1c63971335a6e2963e01352acfa4bd0c1d86bc2 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/15590 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins) Reviewed-by: Furquan Shaikh <furquan@google.com>
2016-06-28arch/riscv: Show fault PC and load address on load access faultsJonathan Neuschäfer
Change-Id: Ib0535bf25ce25550cc17f64177f804a70aa13fb3 Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Reviewed-on: https://review.coreboot.org/15286 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2016-02-19RISC-V: Add more debug info to debug printksAndrew Waterman
Change-Id: I49292e69a5636c675bb8ed7cfe4462ca8189487e Signed-off-by: Andrew Waterman <waterman@cs.berkeley.edu> Reviewed-on: https://review.coreboot.org/13736 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins)
2016-02-19RISC-V: Make inline asm usage saferAndrew Waterman
Change-Id: Id547c98e876e9fd64fa4d12239a2608bfd2495d2 Signed-off-by: Andrew Waterman <aswaterman@gmail.com> Reviewed-on: https://review.coreboot.org/13735 Reviewed-by: Ronald G. Minnich <rminnich@gmail.com> Tested-by: build bot (Jenkins)
2015-10-31tree: drop last paragraph of GPL copyright headerPatrick Georgi
It encourages users from writing to the FSF without giving an address. Linux also prefers to drop that and their checkpatch.pl (that we imported) looks out for that. This is the result of util/scripts/no-fsf-addresses.sh with no further editing. Change-Id: Ie96faea295fe001911d77dbc51e9a6789558fbd6 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Reviewed-on: http://review.coreboot.org/11888 Tested-by: build bot (Jenkins) Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2015-09-15riscv-trap-handling: Add functionality, prevent stack corruptionThaminda Edirisooriya
Trap handling code was bugged in that it loaded in the wrong stack pointer, overwriting the space the processor uses to talk to its host for doing device requests. Fix this issue, as well as add support for handling misaligned loads the same way we handle misaligned stores. Change-Id: I68ba3a114b7167b3212bb0bed181a7595f0b97d8 Signed-off-by: Thaminda Edirisooriya <thaminda@google.com> Reviewed-on: http://review.coreboot.org/11620 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
2015-09-10riscv-trap-handling: Add implementation for trap calls in riscvThaminda Edirisooriya
RISCV requires the bios/bootloader to set up an interface by which it can get information about memory, talk to host devices, etc. Put implementation for spike in src/mainboard/emulation/spike-riscv/spike_util.c, and src/arch/riscv/trap_handler.c Change-Id: Ie1d5f361595e48fa6cc1fac25485ad623ecdc717 Signed-off-by: Thaminda Edirisooriya <thaminda@google.com> Reviewed-on: http://review.coreboot.org/11368 Tested-by: build bot (Jenkins) Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
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