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2020-03-28include: sbi_timer: Remove scratch parameter from most funcitonsAnup Patel1-7/+16
This patch removes scratch parameter from most sbi_timer functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_system: Remove scratch parameter and redundant functionsAnup Patel1-12/+2
This patch removes scratch parameter and redundant functions from sbi_system. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_ipi: Remove scratch parameter from most functionsAnup Patel1-6/+5
This patch removes scratch parameter from most sbi_ipi functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_tlb: Remove scratch parameter from sbi_tlb_request()Anup Patel1-2/+1
The sbi_ipi_send_many() should get current HART scratch pointer on it's own using eventually hence removing scratch parameter from sbi_tlb_request(). Signed-off-by: Anup Patel <anup.patel@wdc.com>
2020-03-28lib: sbi_scratch: Introduce sbi_scratch_last_hartid() APIAnup Patel1-0/+6
The patch adds sbi_scratch_last_hartid() API which returns last HART id having a scratch space. We can use this new API to optimize places where we iterate over HART id from 0 to SBI_HARTMASK_MAX_BITS. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: Use more consistent name for atomic xchg() and cmpxchg()Anup Patel1-2/+2
We should remove the "arch_" prefix from atomic xchg() and cmpxchg() function names to have consistent naming of all atomic functions. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28include: sbi_platform: Remove priv parameter from hart_start() callbackAnup Patel1-8/+6
The priv parameter in hart_start() platform callback is redundant hence we remove it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_trap: Simplify sbi_trap_handler() APIAnup Patel1-4/+1
This patch simplify sbi_trap_handler() API as follows: 1. Remove current hartid local variable because sbi_trap_handler() itself does not need it. 2. Remove scratch parameter because none of the functions directly called by sbi_trap_handler() require it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_ecall: Remove mcause, scratch and hartid parametersAnup Patel2-7/+5
We remove mcause, scratch and hartid parameters from various functions for ecall handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_misaligned_ldst: Remove mcause, scratch and hartid parametersAnup Patel1-9/+4
We remove mcause, scratch and hartid parameters from various functions for misaligned load/store handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_illegal_insn: Remove mcause, scratch and hartid parametersAnup Patel1-4/+1
We remove mcause, scratch and hartid parameters from various functions for illegal instruction handling because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_emulate_csr: Remove scratch and hartid parameterAnup Patel1-5/+4
We remove scratch and hartid parameter from various functions for CSR emulation because we can always get current HART id and current scratch pointer using just one CSR access. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: sbi_trap: Remove scratch parameter from sbi_trap_redirect()Anup Patel1-2/+1
The scratch parameter of sbi_trap_redirect() is not used hence we remove it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: Remove scratch parameter from unpriv load/store functionsAnup Patel1-4/+1
The scratch parameter of unpriv load/store functions is now redundant hence we remove it. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-28lib: Optimize unpriv load/store implementationAnup Patel2-3/+23
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>
2020-03-24lib: utils: Move fdt fixup helper routines to a different fileAtish Patra2-53/+67
FDT helper file contain both fdt fixup and parsing functions. Split the fixup related functions to a separate file for a better code organization. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-24platform: fpga/common: Add a fdt parsing helper functionsAtish Patra1-0/+20
Different DT based platforms from the sam family may reuse IP blocks with different configurations. These different configurations can be obtained by parsing the device tree. Add a FDT parser framework that can parse various device configurations from device tree. Currently, the parsing algorithms doesn't cover all the use cases or possible combination of DT configurations. It will be improved over time. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-19include: sbi_platform: Introduce HART index to HART id tableAnup Patel1-12/+51
A platform can have discontinuous and/or sparse HART ids so we cannot always assume a set of HARTs with continuous HART ids. This patch adds support for discontinuous and sparse HART ids by introducing HART index to HART id table. This table has platform hart_count entries and it maps HART index to HART id. The HART index to HART id table has only two restrictions: 1. HART index < sbi_platform hart_count 2. HART id < SBI_HARTMASK_MAX_BITS Example1: Let's say we have a platform with 2 HART ids 11 and 22, for such a a platform: hart_count = 2 hart_index2id[0] = 11 hart_index2id[1] = 22 Example2: Let's say we have a platform with 5 HARTs ids 0, 1, 2, 3, and 4 but out of these HART with id 0 is not usable so for such a platform: hart_count = 5 hart_index2id[0] = -1U hart_index2id[1] = 1 hart_index2id[2] = 2 hart_index2id[3] = 3 hart_index2id[4] = 4 OR hart_count = 4 hart_index2id[0] = 1 hart_index2id[1] = 2 hart_index2id[2] = 3 hart_index2id[3] = 4 With HART index to HART id table in place, the hart_disabled() callback is now redundant so we remove it as well. 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>
2020-03-19lib: sbi_hsm: Remove scratch parameter from hart_started_mask() APIAnup Patel1-2/+1
The scratch parameter in sbi_hsm_hart_started_mask() API is now redundant hence removing it. 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>
2020-03-19include: sbi_platform: Improve sbi_platform_hart_disabled() APIAnup Patel1-16/+20
The sbi_platform_hart_disabled() should return TRUE for HART id greater than platform hart count. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-03-19lib: Handle failure of sbi_hartid_to_scratch() APIAnup Patel1-0/+1
The sbi_hartid_to_scratch() API can fail for non-existent HARTs so all uses of sbi_hartid_to_scratch() API should check return value. 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>
2020-03-19lib: sbi_hsm: Simplify hart_get_state() and hart_started() APIsAnup Patel1-2/+2
We remove redundant scratch parameter from sbi_hsm_hart_get_state() and sbi_hsm_hart_started() APIs. 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>
2020-03-19include: Simplify HART id to scratch macroAnup Patel1-1/+1
This patch simplify HART id to scratch macro as follows: 1. Remove current "scratch" pointer argument because now we use HART id to scratch table 2. Rename sbi_hart_id_to_scratch() to sbi_hartid_to_scratch() to have macro name consistent with the name of callback in struct sbi_scratch 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>
2020-03-19lib: sbi_scratch: Introduce HART id to scratch tableAnup Patel1-2/+6
Instead of calling hartid_to_scratch() callback every time when we want sbi_scratch pointer from HART id, we create a table of sbi_scratch pointers and use that to get sbi_scratch pointer. As a result of HART id to scratch table, the conversion of HART id to sbi_scratch pointer is just 2-3 instructions which was 9 instructions previously. 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>
2020-03-18lib: utils: Add a general device tree fix-up helperBin Meng1-0/+13
This adds a general device tree fix-up helper to do all required device tree fix-ups for a typical platform. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-18lib: utils: Add a fdt_cpu_fixup() helperBin Meng1-0/+12
Add a helper routine to updates the "status" property of a CPU node in the device tree to "disabled" if that hart is in disabled state. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-18lib: utils: Move PLIC DT fix up codes to fdt_helper.cBin Meng2-2/+13
Now that we have a dedicated fdt_helper.c file for DT releated helper routines, move plic_fdt_fixup() codes from plic.c to fdt_helper.c and rename it to fdt_plic_fixup() at the same time, to keep name consistency in the same file. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-18lib: utils: Add a fdt_reserved_memory_fixup() helperBin Meng1-0/+25
Add a helper routine to insert a child node of the reserved memory node in the device tree that describes the protected memory region done by OpenSBI via PMP. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-18lib: sbi: Update pmp_get() to return decoded size directlyBin Meng1-1/+1
Currently pmp_get() returns the log2 length of the PMP memory region size. The caller has to calculate the size based on that and the same codes are duplicated. Update this function to return decoded size directly. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-14platform: Use one unified per-HART stack size macro for all platformsBin Meng1-0/+3
As of today all platforms use 8KB of per-HART stack hence there is no need for each platform to define its own macro or use the magic number. Create one macro for all platforms. Platform still can use its own version if needed. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-03-13include: Make sbi_current_hartid() as macro in riscv_asm.hAnup Patel2-2/+2
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 Patel2-3/+6
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>
2020-03-13sbi: Add definitions for true/falseBin Meng1-0/+2
We currently have TRUE/FALSE, but it could be convenient to have true/false as well. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.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: Introduce sbi_hsm_hart_started_mask() APIAnup Patel1-0/+3
This patch introduce sbi_hsm_hart_started_mask() API as a replacement of sbi_hart_available_mask() API. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
2020-03-11include: Remove disabled_hart_mask from sbi_platformAnup Patel1-8/+7
The disabled_hard_mask in sbi_platform is only 64bits wide so we cannot disable a HART with HARTID > 63. To tackle this, we remove disabled_hart_mask and replace it with hart_disabled() platform callback. 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: 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>
2020-03-11lib: sbi_tlb: Use sbi_hartmask in sbi_tlb_infoAnup Patel1-2/+3
Instead of using single ulong as source mask for sbi_tlb_info, we use sbi_hartmask. This way sbi_tlb_info can easily scale for large number of HARTs. 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: Introduce SBI_TLB_INFO_INIT() helper macroAnup Patel1-1/+10
We introduce SBI_TLB_INFO_INIT() helper macro to help easy initialization of struct sbi_tlb_info which is passed to the sbi_tlb_request() API. 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>
2020-03-11include: Simple hartmask libraryAnup Patel1-0/+141
We add a simple hartmask library to create and maintain HART mask in different parts of OpenSBI sources. This new library is build as wrapper library on-top-of bitmap 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>
2020-03-11lib: Simple bitmap libraryAnup Patel1-0/+128
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: sbi: Fix coding style issuesBin Meng11-62/+71
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>
2020-03-08include: sbi_scratch: Set per-HART scratch size to 4KBAnup Patel1-2/+2
Currently, the per-HART scratch size is 256 bytes on RV32 and 512 bytes on RV64. This patch set per-HART scratch size to 4KB (4096 bytes) for both RV32 and RV64 so that we don't run-out of scratch space anytime soon. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-03-08include: sbi_bitops: More useful bit operationsAnup Patel1-2/+139
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 Patel3-23/+17
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>
2020-02-24lib: Implement Hart State Management (HSM) SBI extensionAtish Patra2-0/+7
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 Patra2-0/+6
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 Patra4-0/+76
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: Add a new platform feature to bringup secondary hartsAtish Patra1-0/+5
A platform may have a specific method to bring-up secondary harts for the first time but may rely on generic WFI based approach for hart hotplug in absence of a platform specific hart hotplug method. Define a platform feature flag for such platforms. The platform needs to implement platform specific bring-up method in hart_start and not define hart_stop method in this case. They must only define SBI_PLATFORM_HAS_HART_SECONDARY_BOOT. SBI_PLATFORM_HAS_HART_HOTPLUG should only be defined when the platform intend to support both hart_start and hart_stop and do not intend to rely on generic WFI based approach. Signed-off-by: Atish Patra <atish.patra@wdc.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-02-24include: Bump-up version to 0.6v0.6Anup Patel1-1/+1
This patch updates OpenSBI version to 0.6 as part of release preparation. Signed-off-by: Anup Patel <anup.patel@wdc.com>
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