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

lib: sbi: Improve boot prints in cold boot sequence

2020-11-10T04:59:23Z

Currently, we have all boot prints at the end of cold boot sequence which means if there is any failure in cold boot sequence before boot prints then we don't get any print. This patch improves boot prints in cold boot sequence as follows: 1. We divide the boot prints into multiple parts and print it from different locations after sbi_console_init() 2. We throw an error print if there is any failure in cold boot sequence after sbi_console_init() Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Improve boot time print with additional PMP information

2020-10-26T17:29:09Z

We know about pmp granularity and number of bits supported by PMP. Show those information in the boot time info print Signed-off-by: Atish Patra Reviewed-by: Anup Patel

lib: sbi: Display domain details in boot prints

2020-10-21T06:31:34Z

We extend boot prints to display details of each domain. In the process, we remove sbi_hart_pmp_dump() because it shows redundant information which domain details already show. Signed-off-by: Anup Patel 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

lib: sbi: Remove redundant hartid parameter from sbi_hart_init()

2020-10-20T05:48:28Z

The hartid parameter of sbi_hart_init() is not used anywhere in sbi_hart_init() implementation so let's remove it. Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Alistair Francis

lib: sbi: Configure PMP late in coldboot and warmboot path

2020-10-20T05:48:03Z

We factor-out PMP configuration from sbi_hart_init() as a separate sbi_hart_pmp_configure() function and do the PMP configuration very late in coldboot and warmboot path just before platform_final_init(). Eventually, this enable us to configure PMP totally based on OpenSBI domain where OpenSBI domains can be parsed from device-tree in any of the platform operations except platform_final_init(). Signed-off-by: Anup Patel Reviewed-by: Atish Patra Reviewed-by: Alistair Francis

lib: sbi: Ensure coldboot HART supports next privilege mode

2020-09-16T03:35:29Z

The coldboot HART jumps to the next booting stage at the end of init_coldboot() so it is absolutely necessary for coldboot HART to support the privilege mode expected by the next booting stage. We extend the coldboot HART selection in sbi_init() to ensure that the selected coldboot HART always supports privilege mode specified in scratch space (i.e. scratch->next_mode). This will further help us allow E-core (without MMU) on SiFive Unleashed and PolarFire ICICLE boards to proceed further and wait in HSM STOPPED state. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi: Detect and print MHPM counters at boot-time

2020-09-01T04:58:31Z

A RISC-V platform can leave unimplemented MHPM counters hard-wired to zero. We extend hart_detect_features() to detect MHPM counters which are accessible and not hard-wired to zero. We also print number of available MHPM counters as part of boot prints. Signed-off-by: Anup Patel Reviewed-by: Atish Patra

lib: sbi_init: Avoid thundering hurd problem with coldboot_lock

2020-08-21T14:05:28Z

We can have thundering hurd problem with coldboot_lock where the boot HART can potentially starve trying to acquire coldboot_lock because some of the non-boot HARTs are continuously acquiring and releasing coldboot_lock. This can happen if MIP.MSIP bit is already set for some of the non-boot HARTs. To avoid thundering hurd problem for coldboot_lock, we use the __smp_load_acquire() and __smp_store_release() for coldboot_done flag and use coldboot_lock only for coldboot_wait_hmask. Signed-off-by: Anup Patel Tested-by: Heinrich Schuchardt Reviewed-by: Atish Patra Reviewed-by: Bin Meng

lib: sbi_hart: Detect number of supported PMP regions

2020-05-19T03:49:48Z

It is not mandatory for a RISC-V systems to implement all PMP regions so we have to check all PMPADDRx CSRs to determine excat number of supported PMP regions. Signed-off-by: Anup Patel