opensbi.git/include/sbi/sbi_scratch.h, branch v0.7

lib: sbi_scratch: Introduce sbi_scratch_last_hartid() API

2020-03-28T08:02:41Z

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 Reviewed-by: Atish Patra

include: Simplify HART id to scratch macro

2020-03-19T03:34:29Z

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 Reviewed-by: Bin Meng Reviewed-by: Atish Patra

lib: sbi_scratch: Introduce HART id to scratch table

2020-03-19T03:32:23Z

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 Reviewed-by: Bin Meng Reviewed-by: Atish Patra

include: Make sbi_hart_id_to_scratch() as macro

2020-03-13T06:48:07Z

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 Reviewed-by: Atish Patra Reviewed-by: Bin Meng

lib: sbi: Fix coding style issues

2020-03-10T04:57:28Z

This fixes various coding style issues found in the SBI codes. No functional changes. Signed-off-by: Bin Meng Reviewed-by: Anup Patel

include: sbi_scratch: Set per-HART scratch size to 4KB

2020-03-08T05:47:01Z

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 Reviewed-by: Atish Patra

lib: Introduce sbi_tlb_fifo_request() API

2020-01-22T06:40:40Z

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 Reviewed-by: Atish Patra

include: Typo fix in comment for SBI_SCRATCH_SIZE define

2020-01-22T06:40:31Z

This patch fixes a minor typo in comment for SBI_SCRATCH_SIZE define. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: Introduce sbi_dprintf() API

2019-08-09T07:08:33Z

This patch introduces new sbi_dprintf() API for runtime debug prints. The sbi_dprintf() will print to console for a given HART only when SBI_SCRATCH_DEBUG_PRINTS option in enabled in sbi_scratch for this HART. We can now add debug prints using sbi_dprintf() at important places in OpenSBI sources. These debug prints will only show up when previous booting stage or compile time parameter sets the SBI_SCRATCH_DEBUG_PRINTS option in scratch space. Signed-off-by: Anup Patel Reviewed-by: Bin Meng

lib: Add a simple brain-dead allocator to manage extra scratch space

2019-05-24T02:52:47Z

We have extra space above scratch space (sbi_scratch) which we are currently using to manage per-HART IPI data and TLB request management. In future, more parts of OpenSBI will use the extra scratch space so it will become difficult to manage extra scratch space using just defines and macros. This patch adds a simple brain-dead allocator to manage extra scratch space. This allocator never expects anything to be free-ed hence it keeps incrementing to next allocation offset until it runs-out of space. In future, we can have more sophisticated allocator which will allow us to re-claim free-ed space and also allows us to track owner of allocated space. Signed-off-by: Anup Patel Reviewed-by: Atish Patra