opensbi.git, branch v0.9

include: Bump-up version to 0.9

2021-01-18T13:17:19Z

This patch updates OpenSBI version to 0.9 as part of release preparation. Signed-off-by: Anup Patel

platform: template: Fix compile error

2021-01-18T09:19:56Z

This clint driver init functions were incorrectly used in template platform which resulted in compile error. This patch fixes clint driver function usage in template platform. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi: Don't pack struct sbi_platform and sbi_platform_operations

2021-01-15T05:10:33Z

We don't need to pack struct sbi_platform and sbi_platform_operations because GCC ensures member offsets match member data type irrespective to the target system (RV32 or RV64). This also allows GCC to generate more optimized instruction sequence when accessing members of struct sbi_platform and struct sbi_platform_operations. Reported-by: Paul Campbell Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

include: sbi: No need to pack struct sbi_scratch

2021-01-15T05:10:31Z

All members in struct sbi_scrach are of machine word size so no need to pack this structure. This also allows GCC to generate more optimized instruction sequence when accessing members of struct sbi_scratch. Reported-by: Paul Campbell Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

include: sbi: No need to pack struct sbi_trap_regs

2021-01-15T05:10:29Z

All members in struct sbi_trap_regs are of machine word size so no need to pack this structure. This also allows GCC to generate more optimized instruction sequence when accessing members of struct sbi_trap_regs. Reported-by: Paul Campbell Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

lib: sbi: Allow platforms to provide root domain memory regions

2021-01-12T05:11:11Z

Currently, the root domain memory regions are fixed in generic code but some of the platforms may want to explicitly define memory regions for the root domain. This patch adds optional domains_root_regions() platform callback which platforms can use to provide platform specific root domain memory regions. Due to this changes, the root domain should also undergo all sanity checks (just like regular domain) so we use sbi_domain_register() to register root domain. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: utils: Fix shakti uart implementation

2021-01-07T04:48:23Z

Fix uart_putc implementation. Due to a bug in the IP, this went unnoticed. Use macros instead of magic numbers to make the code more readable. Signed-off-by: Vijai Kumar K Reviewed-by: Anup Patel

lib: sbi: Allow custom local TLB flush function

2021-01-07T04:23:19Z

Currently, we have fixed TLB flush types supported by the remote TLB library. This approach is not flexible and does not allow custom local TLB flush function. For example, after updating PMP entries on a set of HARTs at runtime, we have to flush TLB on these HARTs as well. To support custom local TLB flush function, we replace the "type" field of "struct sbi_tlb_info" with a local TLB flush function pointer. We also provide definitions of standard TLB flush operations (such as fence_i, sfence.vma, hfence.vvma, hfence.gvma, etc). Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Introduce sbi_trap_exit() API

2021-01-07T04:23:17Z

We introduce sbi_trap_exit() API which can help non-firmware (i.e. generic or platform) code to force exit trap/interrupt handling and resume execution at context pointed by parameter "const struct sbi_trap_regs *regs". This new sbi_trap_exit() API will help Keystone Enclave project to resume execution of enclave from custom SBI call handler. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Replace args with trap registers in ecall handler

2021-01-07T04:23:14Z

We had added args pointer in ecall handler to ensure that ecall handler only implements functionality and does not deal with SBI calling convention. This also helped us to keep SBI calling convention related code in one place at sbi_ecall_handler(). The Keystone Enclavce project needs access to the trap regsiters in their ecall handler so that they can context switch enclaves in custom SBI calls. To help the Keystone Enclave project, we replace the args pointer in ecall handler parameter with a const pointer to trap registers. Signed-off-by: Anup Patel Reviewed-by: Atish Patra