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path: root/include/sbi/sbi_hart.h
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2020-09-01lib: sbi: Detect and print MHPM counters at boot-timeAnup Patel1-0/+1
A RISC-V platform can leave unimplemented MHPM counters hard-wired to zero. We extend hart_detect_features() to detect MHPM counters which are accessible and not hard-wired to zero. We also print number of available MHPM counters as part of boot prints. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-01lib: sbi: Remove redundant SBI_HART_HAS_PMP featureAnup Patel1-5/+3
The SBI_HART_HAS_PMP feature is redundant because we already have number of PMP regions returned by sbi_hart_pmp_count(). Checking whether PMP is supported for a HART can be simply done by checking non-zero value returned by sbi_hart_pmp_count(). Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-19lib: sbi_hart: Detect number of supported PMP regionsAnup Patel1-0/+4
It is not mandatory for a RISC-V systems to implement all PMP regions so we have to check all PMPADDRx CSRs to determine excat number of supported PMP regions. Signed-off-by: Anup Patel <anup.patel@wdc.com>
2020-05-19include: sbi: Use scratch pointer as parmeter in HART feature APIsAnup Patel1-3/+3
It makes more sense to have scratch pointer as parameter in HART feature APIs because: 1. We already have scratch pointer at places where these APIs are used. 2. This is consistent with lot of other APIs in sbi_hart.h Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-19lib: sbi: Improve get_feature_str() implementation and usageAnup Patel1-1/+1
We do following improvements for get_feature_str(): 1. We should return "none" from get_feature_str() no features available instead of sbi_boot_prints() explicitly handling failure. 2. We don't need to return failure (just like misa_xlen()) because we are returning "none" for no features and we are truncating output when space is not available. 3. Based on 1 and 2, the sbi_boot_prints() can be further simplified. 4. No need for two char[] in sbi_boot_prints() Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-10lib: Add hart features in boot time printAtish Patra1-0/+4
We have now clear distinction between platform and hart features. Modify the boot print messages to print hart specific features in a string format. Signed-off-by: Atish Patra <atish.patra@wdc.com> Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-05-10lib: timer: Provide a hart based timer featureAtish Patra1-0/+2
As per the RISC-V specification, time value can be obtained from a time CSR implemented in hardware or a MMIO based IP block. Qemu virt machine already supports timer csr while CLINT provides the timer for other platforms. Implement a hart specific timer feature that can be detected at runtime. As CSR based timer implementation are faster than MMIO address based, it is always preferred over MMIO based one. Signed-off-by: Atish Patra <atish.patra@wdc.com> Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-05-10platform: Move platform features to hartAtish Patra1-0/+11
PMP & performance counters belong to a hart rather than a platform. In addition to that, these features enable reading/writing from a particular csr. Thus, they can be detected and set at runtime rather than compile time. Move PMP/MCOUNTEREN/SCOUNTEREN features to hart and detect them at runtime. Signed-off-by: Atish Patra <atish.patra@wdc.com> Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-05-10lib: Add support for hart specific featuresAtish Patra1-0/+1
There may be some features which are hart specific rather than a platform specific feature. Add a framework to support that. Signed-off-by: Atish Patra <atish.patra@wdc.com> Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-05-10lib: Rename unprivileged trap handlerAtish Patra1-3/+3
Unprivileged trap handler can be reused for any cases where the executing code expects a trap. Rename it to "expected" trap handler as it will be used in other cases in future. Signed-off-by: Atish Patra <atish.patra@wdc.com> Tested-by: Jonathan Balkind <jbalkind@cs.princeton.edu> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-28lib: Optimize unpriv load/store implementationAnup Patel1-3/+5
This patch optimize unpriv load/store implementation by having dedicated unpriv trap handler (just like KVM RISC-V). As a result of this optimization: 1. We have reduced roughly 13+ instruction in all unpriv load/store functions. The reduced instruction also include two function calls. 2. Per-HART trap info pointer in scratch space is now redundant hence removed. 3. The sbi_trap_handler() is now much cleaner because we don't have to handle unpriv load/store traps. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-13include: Make sbi_current_hartid() as macro in riscv_asm.hAnup Patel1-2/+0
The sbi_current_hartid() being a regular function is quite expensive because for callers it is a function call instead of a direct CSR read. This patch converts sbi_current_hartid() into a macro in riscv_asm.h. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-13include: Make sbi_hart_id_to_scratch() as macroAnup Patel1-3/+0
The sbi_hart_id_to_scratch() just forwards call to firmware specific hartid_to_scratch() callback so we make sbi_hart_id_to_scratch() as macro in sbi_scratch.h instead of regular function in sbi_hart.c. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-03-11lib: sbi_hart: Remove HART available mask and related APIsAnup Patel1-6/+0
The HART available mask and related APIs are now totally redundant because of more extensive HART state machine implemented by sbi_hsm. Due to above, we remove HART available mask and related APIs. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-03-11lib: Move all coldboot wait APIs to sbi_init.cAnup Patel1-4/+0
The coldboot wait APIs are only used by sbi_init.c so no point in having coldboot related code in sbi_hart.c. As per-above rationale, we move all coldboot wait related APIs to sbi_init.c as static/local functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-02-24lib: Implement hart hotplugAtish Patra1-0/+2
This patch adds support for hart hotplug in OpenSBI using a generic WFI based approach. Hart hotplug can be achieved via SBI HSM extension which allows supervisor mode software to start or stop any harts anytime. Any platform wishes to implement platform specific hart hotplug must implement both hart_start and hart_stop in addition to enable platform feature SBI_PLATFORM_HAS_HART_HOTPLUG. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-19lib: Print interrupt and exception delegation in boot printsAnup Patel1-0/+1
We print MIDELEG and MEDELEG CSRs as part of boot prints so that boot log shows the interrupts and exceptions delegated to S-mode. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2019-09-30lib: Extend sbi_hart_switch_mode() to support hypervisor extensionAnup Patel1-1/+2
This patch extends sbi_hart_switch_mode() to support entering VS/VU modes when hypervisor extension is available. Signed-off-by: Anup Patel <anup.patel@wdc.com>
2019-05-24lib: Add per-HART trap info pointerAnup Patel1-1/+5
This patch adds per-HART trap info pointer which can be used to communicate trap information to sbi_trap_handler(). Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2019-04-24all: run clang-format and update checked-in filesOlof Johansson1-4/+3
Noisy commit, no functional changes. Generated with an current upstream clang-format and: clang-format -i $(find . -name \*.[ch]) Signed-off-by: Olof Johansson <olof@lixom.net>
2019-01-24all: Update copyright header in all filesAnup patel1-3/+3
This patch updates copyright header in all files as follows: 1. Makes "SPDX-License-Identifier: BSD-2-Clause" as first line 2. Change copyright year to 2019 for Western Digital Signed-off-by: Anup Patel <anup.patel@wdc.com>
2018-12-21Introduce sbi_current_hartid()Damien Le Moal1-0/+2
Use this helper instead of hardcoding csr_read(mhartid). Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
2018-12-21Cleanup and rename sbi_hart_boot_next()Damien Le Moal1-4/+4
Cleanup sbi_hart_boot_nexti() code, adding messages for clarity and rename the function to sbi_hart_switch_mode() to reflect what the function actually does. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
2018-12-21Refine platform features controlDamien Le Moal1-1/+1
Allow a platform to report its supported features in more details. The new features defined are: * SBI_PLATFORM_HAS_PMP * SBI_PLATFORM_HAS_SCOUNTEREN * SBI_PLATFORM_HAS_MCOUNTEREN In addition, define the macro SBI_PLATFORM_DEFAULT_FEATURES as the set of features that are generally expected to be supported by a Linux capable platform. Operations touching the features controlled with these falgs are not executed if the platform does not set the corresponding feature flags. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
2018-12-21Use wfi for coldboot finish call.Atish Patra1-1/+1
Signed-off-by: Atish Patra <atish.patra@wdc.com>
2018-12-11Initial commit.Anup Patel1-0/+41
Signed-off-by: Anup Patel <anup.patel@wdc.com>
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-13 10:26:37 +0300