opensbi.git/include/sbi/sbi_platform.h, branch v0.9

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

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: 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: 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

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: Improve system reset platform operations

2020-12-01T11:40:31Z

To implement the SBI SRST extension, we need two platform operations for system reset: 1) system_reset_check() - This operation will check whether given reset type and reason are supported by the platform 2) system_reset() - This operation will do the actual platform system reset and it will not return if reset type and reason are supported by the platform This patch updates system reset related code everywhere as-per above. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

include: sbi: Remove opensbi specific reset type defines

2020-12-01T11:35:12Z

We can now use the standard SBI SRST extension reset types instead of the opensbi specific (SBI_PLATFORM_RESET_xyz) reset types hence remove related opensbi specific defines. The "platform_" prefix of the reset type parameter of sbi_system_reset() function should also be removed. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

lib: sbi: Add initial domain support

2020-10-20T05:52:15Z

An OpenSBI domain is a logical entity representing a set of HARTs and a set of memory regions for these HARTs. The OpenSBI domains support will allow OpenSBI platforms and previous booting stage (i.e. U-Boot SPL, Coreboot, etc) to partition a system into multiple domains where each domain will run it's own software. For inter-domain isolation, OpenSBI will eventually use various HW features such as PMP, ePMP, IOPMP, SiFive shield, etc but initial implementation only use HW PMP support. This patch provides initial implementation of OpenSBI domains where we have a root/default domain and OpenSBI platforms can provide non-root/custom domains using domain_get() callback. Signed-off-by: Anup Patel Reviewed-by: Alistair Francis Reviewed-by: Atish Patra

include: sbi: Remove pmp_region callbacks from sbi_platform_operations

2020-10-20T05:47:15Z

The pmp_region_xyz() callbacks are not required in sbi_platform_operations because we will be using OpenSBI domain memory regions to program the PMP CSRs. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Alistair Francis

include: sbi: Remove redundant includes from sbi_platform.h

2020-10-20T05:46:37Z

The sbi_ecall.h and sbi_trap.h are not required to be included in sbi_platform.h hence we remove it. This way sources requiring these headers will have to explicitly include it thereby reducing implicit includes. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Alistair Francis