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2020-03-11lib: sbi_init: Don't allow HARTID greater than SBI_HARTMASK_MAX_BITSAnup Patel1-1/+3
We only allow HARTs with HARTID less than SBI_HARTMASK_MAX_BITS in sbi_init() function so that sbi_hartmask can safely used across OpenSBI sources. 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>
2020-03-11lib: Simple bitmap libraryAnup Patel2-0/+41
We add simple bitmap library which will help us create and maintain bitmaps. It will also help us create a simple HART mask library. 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>
2020-03-10lib: serial: Fix coding style issuesBin Meng2-11/+11
This fixes various coding style issues found in the serial codes. No functional changes. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-10lib: sbi: Fix coding style issuesBin Meng8-41/+42
This fixes various coding style issues found in the SBI codes. No functional changes. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-10lib: Sort build objects in alphabetical orderBin Meng3-6/+6
Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-08include: sbi_bitops: More useful bit operationsAnup Patel2-0/+201
This patch extends our bit operation library with mechanism to: 1. Iteratively traverse bits 2. Set bit 3. Clear bit 4. Change bit 5. ... other helpful functions ... Most the above is adopted from Xvisor sources. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-08include: Move bits related defines and macros to sbi_bitops.hAnup Patel7-10/+10
The right location for all bits related defines and macros is sbi_bitops.h hence this patch. With this patch, the sbi_bits.h is redundant so we remove it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-08lib: Fix return type of sbi_hsm_hart_started()Anup Patel1-2/+1
The return type of sbi_hsm_hart_started() should be bool. 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>
2020-03-07lib: Check MSIP bit after returning from WFIAtish Patra1-2/+5
As per the RISC-V privilege specification, WFI can be implemented as a NOP. Software should ensure that relevant interrupt pending bits are set. Otherwise, loop back to WFI. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-02-24lib: Implement Hart State Management (HSM) SBI extensionAtish Patra3-0/+55
This patch adds support HSM extension. The specification is available at https://github.com/riscv/riscv-sbi-doc. It allows to implement hart hotplug and fixed ordered hart booting in supervisor. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-24lib: Add possible hart status valuesAtish Patra1-0/+25
SBI HSM extension defines possible hart status values in the specification. Define all possible status values. Add a helper function to convert hart state to status because hart states are internal to OpenSBI only and may not match the status values defined in the specification. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-24lib: Implement hart hotplugAtish Patra6-2/+267
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>
2020-02-24lib: Simplify the for-loop in sbi_ipi_send_many()Anup Patel1-9/+1
We don't need to separately call sbi_ipi_send() for current HART in sbi_ipi_send_many(). Instead, we can simplify the for-loop in sbi_ipi_send_many() and call sbi_ipi_send() for all HARTs in the for-loop itself. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-02-22lib: Use available hart mask for correct hbase valueAtish Patra1-13/+16
As per the latest SBI specification, all online harts should receive IPI if hbase is set to -1. Set the target mask to all available hart mask if hbase is -1. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-22lib: Fix typo in atomic exchange functionsAtish Patra1-1/+1
There is a typo in atomic operations code which prevents the usage of riscv atomic instructions even if it is supported. Fix the typo. 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 Patel2-2/+14
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>
2020-02-19lib: Don't check MIDELEG and MEDELEG at end of delegate_traps()Anup Patel1-5/+0
The MIDELEG and MEDELEG CSR checks at end of delegate_traps() were added for initial bring-up on SiFive Unleashed and QEMU. These checks are not required any more and in-future these checks can cause failures because some of the MIDELEG/MEDELEG bits will be hard-wired to 0 or 1. For related discussion, refer github issue: https://github.com/riscv/opensbi/issues/157 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>
2020-02-18lib: utils: htif: Fix 32-bit buildBin Meng1-3/+3
When building 32-bit OpenSBI images, we get: lib/utils/sys/htif.c: In function '__check_fromhost': lib/utils/sys/htif.c:12:31: error: left shift count >= width of type [-Werror=shift-count-overflow] #define HTIF_DATA_MASK ((1UL << HTIF_DATA_BITS) - 1) ^~ Fixes: c2f23cc6edd7 ("platform: Add Spike initial support") Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-18Revert "lib: Use __builtin_ctzl() in pmp_get()"Anup Patel1-1/+13
This reverts commit 897b8fbdd92fcfad194417d348b8dad16ab0e17a. We are seeing compile errors using newlib based GCC cross-toolchain so we restore back old ctz() implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com>
2020-02-17platform: Add Spike initial supportJames Clarke2-0/+150
This patch adds initial platform support Spike emulator. Signed-off-by: James Clarke <jrtc27@jrtc27.com> 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>
2020-02-13lib: irqchip/plic: Disable all contexts and IRQsAtish Patra1-4/+4
To initialize PLIC in sane state, we should: 1. set maximum threshold value of M-mode PLIC contexts 2. set maximum threshold value of S-mode PLIC contexts 3. set irq priorities to miniumum Fix the comment and initialize the threshold/priorities correctly. Signed-off-by: Anup Patel <anup.patel@wdc.com> Signed-off-by: Atish Patra <atish.patra@wdc.com>
2020-02-13lib: Initialize out value in SBI callsAtish Patra1-1/+1
As per the SBI specification, the return value in sbiret is undefined if not explicitly described in the function. However, supervisor may check this value by mistake and get a garbage value. Initialize it to zero to avoid nasty supervisor bugs. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-13lib: Use __builtin_ctzl() in pmp_get()Li Jinpei1-13/+1
We should should __builtin_ctzl() in pmp_get() instead of custom ctz() function. Signed-off-by: Li Jinpei <leekingp1994@163.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-02-13lib: sbi_scratch: use bitwise ops in sbi_scratch_alloc_offset()Li Jinpei1-2/+2
Instead of using loop to make "size" machine word aligned, we should use bitwise ops. Signed-off-by: Li Jinpei <leekingp1994@163.com> Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Factor-out SBI base extensionAnup Patel3-71/+81
This patch factor-out SBI base extension into its own source for better modularity of SBI implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Factor-out SBI vendor extensionAnup Patel3-27/+43
This patch factor-out SBI vendor extension into its own source for better modularity of SBI implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Factor-out SBI replacement extensionsAnup Patel3-133/+147
This patch factor-out SBI replacement extensions (such as RFENCE, IPI, and TIME) into its own source for better modularity of SBI implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Factor-out SBI legacy extensionAnup Patel3-102/+121
This patch factor-out SBI legacy extension into its own source for better modularity of SBI implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Add dynamic registration of SBI extensionsAnup Patel2-66/+178
This patch extends our SBI ecall implementation to allow dynamic registration of various SBI extensions. Using this dynamic registration we can break-up SBI ecall implementation into multiple files and even register experimental/custom SBI extensions from platform code. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Initialize TLB management directly from coldboot/warmboot pathAnup Patel2-6/+9
Currently, the remote TLB management is initialized via IPI init which is counter intuitive. This patch initializes remote TLB management directly from init_coldboot() and init_warmboot() after IPI init is done. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Drop _fifo from the name of various sbi_tlb_fifo_xyz() functionsAnup Patel3-53/+43
This patch drops _fifo from the name of various sbi_tlb_fifo_xyz() functions because all these functions deal with remote TLB managment and FIFO is the per-HART data structure used internally by remote TLB implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Introduce sbi_ipi_event_create/destroy() APIsAnup Patel2-39/+117
This patch introduces sbi_ipi_event_create/destroy() APIs and struct sbi_ipi_event_ops for creating/destroying IPI events at runtime based of event operations. This new APIs will help platform code and utils code to create custom IPI events which are not part of generic OpenSBI library. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Introduce sbi_tlb_fifo_request() APIAnup Patel2-33/+28
Instead of directly calling sbi_ipi_send_many(), we introduce sbi_tlb_fifo_request() for halting a set of HARTs. This way in future we can assign any IPI event number for remote FENCE within sbi_tlb.c only. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Introduce sbi_ipi_send_halt() APIAnup Patel2-6/+10
Instead of directly calling sbi_ipi_send_many(), we introduce sbi_ipi_send_halt() for halting a set of HARTs. This way in future we can assign any IPI event number for HART halting within sbi_ipi.c only. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Introduce sbi_ipi_send_smode() APIAnup Patel2-4/+8
Instead of directly calling sbi_ipi_send_many(), we introduce sbi_ipi_send_smode() for injecting S-mode software interrupts. This way in future we can assign any IPI event number for S-mode IPIs within sbi_ipi.c only. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-22lib: Move struct sbi_ipi_data definition to sbi_ipi.cAnup Patel1-0/+4
The struct sbi_ipi_data is only used in sbi_ipi.c so move it to sbi_ipi.c from sbi_ipi.h. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add sbi_init_count() APIAnup Patel1-0/+33
We add sbi_init_count() API which provides number of times a given HART completed init sequence (warmboot/coldboot). This will be very useful in debugging. With upcoming SBI HSM extension, it will also help in implementing one-time init code for each HART. Signed-off-by: Anup Patel <anup@brainfault.org> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: zero-out memory allocated using sbi_scratch_alloc_offset()Anup Patel1-0/+17
We should zero-out memory allocated from extra scratch space using sbi_scratch_alloc_offset() API hence this patch. This will not impact performance because we mostly allocate from extra scratch space only at cold boot time. Signed-off-by: Anup Patel <anup@brainfault.org> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: improve system reboot and shutdown implementationAnup Patel1-13/+24
We improve sbi_system_reboot() an sbi_system_shutdown() by: 1. Calling halt IPI to all harts (except current HART) before calling platform reboot/shutdown hook. 2. Calling sbi_exit() instead of sbi_hang() in-case platform reboot/shutdown hook failed. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: do sbi_exit() upon halt IPIAnup Patel1-1/+2
Instead of doing sbi_hang() we should do sbi_exit() upon halt IPI. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: save/restore MIE CSR in sbi_hart_wait_for_coldboot()Anup Patel1-0/+7
Currently, sbi_hart_wait_for_coldboot() leaves MIE.MSIP bit set when it returns which is not correct because MIE.MSIP should be left enabled only by sbi_ipi_init(). This patch does save/restore of MIE CSR to ensure that MIE CSR is in original state after sbi_hart_wait_for_coldboot() returns. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add irqchip exit APIAnup Patel1-0/+2
We add an optional platform irqchip exit hook for exit path handling in sbi_exit() implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add ipi exit APIAnup Patel2-1/+20
We add sbi_ipi_exit() API for exit path handling in sbi_exit() implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add timer exit APIAnup Patel2-5/+12
We add sbi_timer_exit() API for OpenSBI exit path handling in sbi_exit() implementation. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add system early_exit and final_exit APIsAnup Patel2-0/+14
This patch adds system-level early_exit and final_exit APIs with corresponding platform hooks. These new APIs will be primarily used by sbi_exit() in OpenSBI exit path. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Add initial sbi_exit() APIAnup Patel1-0/+22
This patch adds initial implementation of sbi_exit() API which can be used to perform OpenSBI exit sequence for current HART. The sbi_exit() implementation will be further extended by subsequent patches. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-07lib: Remove unnecessary checks from init_coldboot() and init_warmboot()Anup Patel1-14/+7
We remove unnecessary checks related to hart hotplug and disabled hart in coldboot and warmboot init path. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-01-02lib: utils: Support CLINT with 32bit MMIO access on RV64 systemAnup Patel1-38/+50
It is possible to have a CLINT implementation which supports only 32bit MMIO accesses on RV64 system so this patch extends our CLINT driver such that platform code can specify whether CLINT supports 64bit MMIO access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra<atish.patra@wdc.com> Reviewed-by: Zong Li <zong.li@sifive.com>
2019-12-23lib: Implement RFENCE extensionAtish Patra1-1/+94
This patch adds RFENCE extension support in OpenSBI. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2019-12-23lib: Support stage1 and stage2 tlb flushingAtish Patra1-4/+98
The hypervisor specification support hfence calls which can be used issue tlb flush requests at both level of address translation. Currently, these requests are issued only via SBI which are defined in v0.2. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
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