opensbi.git/lib/sbi, branch v0.9

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: 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

lib: sbi: Fix sign-extension in sbi_misaligned_load_handler()

2020-12-24T11:05:28Z

The misaligned load emulation does not sign-extend values correctly due to missing sign typecast in value passed to the SET_RD() macro. A very easy way to reproduce this issue is to load 16-bit value 0xff1e from a byte aligned address using LH instruction on hardware lacking misaligned load/store. This patch fixes sbi_misaligned_load_handler() for above issue. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Remove domain_get() platform callback function

2020-12-16T04:40:28Z

The domain_get() platform callback function is now redundant because fdt_domain_populate() register new domain explicitly using the sbi_domain_register() function. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

lib: sbi: Add function to register new domain

2020-12-16T04:40:22Z

We add sbi_domain_register() function to help platform code register a new domain explicitly instead of depending on domain_get() platform callback. This function will eventually help us completely remove the domain_get() platform callback. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

include: sbi: Add domains_init() platform operation

2020-12-04T12:31:00Z

We introduce domains_init() platform operation which can be used by platform support to initialize/populate domains in the coldboot path. The domains_init() is called late in the coldboot sequence from the sbi_domain_finalize() so sbi_printf() can be used by platform support to print errors/warnings at time of populating domains. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

lib: sbi: Add error prints in sbi_domain_finalize()

2020-12-04T12:30:04Z

We add error prints in sbi_domain_finalize() and sanitize_domain() to help debug domain configuration issues. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

lib: sbi: Override domain boot HART when coldboot HART assigned to it

2020-12-04T12:28:59Z

If coldboot HART is assigned to a domain then we should use coldboot HART as the boot HART of the domain. This allows coldboot HART to continue boot sequence even when it is assigned to some non-root domain. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra