Commit Graph

287 Commits

Author SHA1 Message Date
Anup Patel
1bbf36183e include: sbi: Don't pack struct sbi_platform and sbi_platform_operations
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 <taniwha@gmail.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-15 10:40:33 +05:30
Anup Patel
386eba21bf include: sbi: No need to pack struct sbi_scratch
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 <taniwha@gmail.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-15 10:40:31 +05:30
Anup Patel
e884416650 include: sbi: No need to pack struct sbi_trap_regs
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 <taniwha@gmail.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-15 10:40:29 +05:30
Anup Patel
db56341dfa lib: sbi: Allow platforms to provide root domain memory regions
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-12 10:41:11 +05:30
Anup Patel
12394a269b lib: sbi: Allow custom local TLB flush function
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-07 09:53:19 +05:30
Anup Patel
b7df5e4392 lib: sbi: Introduce sbi_trap_exit() API
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-07 09:53:17 +05:30
Anup Patel
80bc5065bb lib: sbi: Replace args with trap registers in ecall handler
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2021-01-07 09:53:14 +05:30
Anup Patel
a029bd90c6 lib: sbi: Remove domain_get() platform callback function
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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-16 10:10:28 +05:30
Anup Patel
6fc1986f50 lib: utils: Remove fdt_domain_get() function
The fdt_domain_get() function is now redundant because the
fdt_domains_populate() function can explicitly register new
domains using the sbi_domain_register() function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-16 10:10:25 +05:30
Anup Patel
7baccfca79 lib: sbi: Add function to register new domain
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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-16 10:10:22 +05:30
Anup Patel
2179777364 lib: utils: Allow FDT domain iteration functions to fail
We extend fdt_iterate_each_domain() and fdt_iterate_each_memregion()
functions to allow underlying iteration function to fail. This will
help us catch more domain misconfiguration issues at boot time.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-16 10:10:19 +05:30
Anup Patel
ba741ea0ad lib: utils: Add helper routines to populate domains from FDT
We add various helper routines to populate domains, iterate domains,
iterate domain memregions, and parse HART to domain assignment from
the FDT.

These helper routines can be used by platform support code and FDT
fixup code.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-04 21:10:44 +05:30
Anup Patel
9b65dcaedd include: sbi: Add domains_init() platform operation
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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-04 18:01:00 +05:30
Anup Patel
c1f6d89678 include: sbi: Use lower bits for domain memory region permissions
We should use lower bits for domain memory region access permissions
and higher bits for other domain memory region attributes. This helps
us use same bit assignment for parsing domain memory region access
permissions from device tree.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-04 17:58:20 +05:30
Anup Patel
548d03e577 lib: sbi: Implement System Reset (SRST) SBI extension
The SBI SRST extension has been accepted and merged in the latest
SBI v0.3-draft specification.
(Refer, https://github.com/riscv/riscv-sbi-doc)

It allows to S-mode software to request system shutdown, cold reboot,
and warm reboot.

This patch implements SBI SRST extension as a replacement of the
legacy sbi_shutdown() call of SBI v0.1 specification.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-01 17:11:11 +05:30
Anup Patel
5c429ae213 lib: sbi: Improve system reset platform operations
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-01 17:10:31 +05:30
Anup Patel
c4acc60a46 include: sbi: Remove opensbi specific reset type defines
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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-01 17:05:12 +05:30
Anup Patel
54a7734d86 include: sbi: Add SBI SRST extension related defines
We extend the SBI ecall interface header for the SBI SRST extension
recently accepted in SBI specification v0.3-draft.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-12-01 17:03:50 +05:30
Atish Patra
bf21632860 lib: sbi: Detect PMP granularity and number of address bits
As per RISC-V privilege specification, a platform may choose to implement
a coarser granularity scheme for PMP addresses. In that case, we shouldn't
allow any pmp region size smaller than the platform supports. A platform
may not also implement all the bits for a PMP address specified in the priv
specification.

The pmp range granularity and address bits should be detected dynamically
before detecing PMP regions. Any pmp modification request beyond these detected
value must not succeed.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-10-26 22:44:52 +05:30
Anup Patel
c347408a39 lib: sbi: Display domain details in boot prints
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-10-21 12:01:34 +05:30
Anup Patel
e856462ac2 lib: sbi: Remove redundant sbi_hart_pmp_xyz() functions
The sbi_hart_pmp_get() and sbi_hart_pmp_check_addr() functions
are not used anymore hence this patch removes these functions.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-10-20 14:12:26 +05:30
Anup Patel
3a30d2c34d lib: sbi: Extend sbi_hsm_hart_start() for domains
The sbi_hsm_hart_start() should consider the domain under which we
are trying to start the HART. This will help ensure that HART A can
start HART B only if both HARTs A and B belong to the same domain.

We also have a special case when we bring-up boot HART of non-root
domains in sbi_domain_finalize() where we should skip domain checks
in sbi_hsm_hart_start(). To achieve this, sbi_hsm_hart_start() should
do domain checks only when domain parameter is non-NULL.

This patch extends sbi_hsm_hart_start() as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-10-20 13:56:36 +05:30
Anup Patel
e73b92d862 lib: sbi: Extend sbi_hsm_hart_started_mask() for domains
The sbi_hsm_hart_started_mask() API should take one more parameter
to allow caller specify domain under which started_mask is being
generated. Further, the sbi_hsm_hart_started_mask() depends on
sbi_hsm_hart_get_state() which also should return HART state under
specified domain.

This patch updates both sbi_hsm_hart_started_mask() and
sbi_hsm_hart_get_state() as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:32:40 +05:30
Anup Patel
b1678af210 lib: sbi: Add initial domain support
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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-10-20 11:22:15 +05:30
Anup Patel
8b650050ec include: sbi: Make hartmask pointer const in sbi_hartmask_test_hart()
The sbi_hartmask_test_hart() does not modify hartmask so the
hartmask pointer parameter should be declared const.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:19:13 +05:30
Anup Patel
f81d6f6f43 lib: sbi: Remove redundant hartid parameter from sbi_hart_init()
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:18:28 +05:30
Anup Patel
a126886bfa lib: sbi: Configure PMP late in coldboot and warmboot path
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:18:03 +05:30
Anup Patel
a12d46a5e7 include: sbi: Remove pmp_region callbacks from sbi_platform_operations
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:17:15 +05:30
Anup Patel
dbeeacb878 include: sbi: Remove redundant includes from sbi_platform.h
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
2020-10-20 11:16:37 +05:30
Heinrich Schuchardt
79bf80b44e lib: sbi_scratch: typo scatch
%s/scatch/scratch

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-10-02 15:50:55 +05:30
Anup Patel
7ccf6bf54c lib: sbi: Allow specifying mode in sbi_hart_pmp_check_addr() API
We extend sbi_hart_pmp_check_addr() API so that users can specify
privilege mode of the address for checking PMP access permissions.

To achieve this, we end-up converting "unsigned long *size" parameter
to "unsigned long *log2len" for pmp_get() implementation so that we
can deal with regions of "1UL << __riscv_xlen" size in a special case
in sbi_hart_pmp_check_addr() implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-16 09:05:25 +05:30
Anup Patel
6734304f8c lib: sbi: Allow specifying start mode to sbi_hsm_hart_start() API
The sbi_scratch already has provision to specify the next stage mode
so we can leverage this to specify start mode to sbi_hsm_hart_start().

In future, this will be useful in providing SBI calls to U-mode on
embedded cores where we M-mode and U-mode but no S-mode.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-16 09:05:22 +05:30
Anup Patel
bef63d6848 include: Rename ECALL defines to match latest RISC-V spec
We rename CAUSE_HYPERVISOR_ECALL to CAUSE_SUPERVISOR_ECALL and
CAUSE_SUPERVISOR_ECALL to CAUSE_VIRTUAL_SUPERVISOR_ECALL so that
it matches latest RISC-V privilege spec.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-09 09:32:02 +05:30
Anup Patel
162d453b49 include: sbi: Few cosmetic changes in riscv_encoding.h
This patch does following cosmentic changes to riscv_encoding.h:
1. Re-organize CSR defines to match CSR listing in latest RISC-V
   privilege spec
2. Rename CSR_HCOUNTERNEN to CSR_HCOUNTEREN

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-01 10:28:33 +05:30
Anup Patel
2c341f7844 lib: sbi: Detect and print MHPM counters at boot-time
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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-01 10:28:31 +05:30
Anup Patel
74d1db7062 lib: sbi: Improve PMP CSR detection and progamming
As-per latest RISC-V privilege spec up to 64 PMP entries are supported.
Implementations may implement zero, 16, or 64 PMP CSRs. All PMP CSR
fields are WARL and may be hardwired to zero.

This patch improves PMP CSR detection and progamming considering
above facts.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-01 10:28:28 +05:30
Anup Patel
7b0b289887 lib: sbi: Remove redundant SBI_HART_HAS_PMP feature
The SBI_HART_HAS_PMP feature is redundant because we already
have number of PMP regions returned by sbi_hart_pmp_count().

Checking whether PMP is supported for a HART can be simply done
by checking non-zero value returned by sbi_hart_pmp_count().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-09-01 10:28:26 +05:30
Abner Chang
8e47649eff lib: Add sbi_strncmp implementation
This commit add an implementation of sbi_strncmp.

Signed-off-by: Abner Chang <abner.chang@hpe.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-07-29 12:03:45 +05:30
Tobias Klauser
ec1abf6657 include: sbi_bitops: Remove dead shift assignment in ffs/fls
The value assigned to x by the shift assignment in the last if block of
ffs/fls is never read. Remove it.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-07-14 17:03:30 +05:30
Anup Patel
a98258d0b5 include: Bump-up version to 0.8
This patch updates OpenSBI version to 0.8 as part of
release preparation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
2020-06-20 11:57:24 +05:30
Anup Patel
2314101989 lib: Don't return any invalid error from SBI ecall
We should only return valid error codes from SBI ecalls as
defined by the RISC-V SBI spec.

To achieve this:
1. We use SBI_Exxxx defines for OpenSBI internal errors with
   error values starting from -1000
2. We use SBI_ERR_xxxx defines for errors defined by SBI spec
3. We map some of the SBI_Exxxx defines to SBI_ERR_xxxx defines
   which are semantically same
4. We throw a error print and force return error code to
   SBI_ERR_FAILED in sbi_ecall_handler() if we see an invalid
   error code being returned to S-mode

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-06-20 10:36:13 +05:30
Vijai Kumar K
db56ef367c platform: Add support for Shakti C-class SoC from IIT-M
C-Class is a member of the SHAKTI family of processors from Indian
Institute of Technology - Madras(IIT-M).
It is an extremely configurable and commercial-grade 5-stage in-order
core supporting the standard RV64GCSUN ISA extensions.

https://gitlab.com/shaktiproject/cores/c-class/blob/master/README.md

We add OpenSBI support for Shakti C-class SoC.

Signed-off-by: Vijai Kumar K <vijai@behindbytes.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-06-19 09:21:46 +05:30
Alexandre Ghiti
6966ad0abe platform/lib: Allow the OS to map the regions that are protected by PMP
This is achieved by removing the 'no-map' property from the
'reserved-memory' node when PMP is present, otherwise we keep it as it
offers a small protection if the OS does not map this region at all.
A new callback in platform_override is introduced and allows to fixup the
device-tree. It is used here to override this new default behaviour on
SiFive Fu540 platforms that has an erratum that prevents S-mode software
to access a PMP protected region using 1GB page table mapping.

If PMP is present, telling the OS not to map the reserved regions does not
add much protection since it only avoids access to regions that are already
protected by PMP. But by not allowing the OS to map those regions, it
creates holes in the OS system memory map and prevents the use of
hugepages which would generate, among other benefits, less TLB miss.

Signed-off-by: Alexandre Ghiti <alex@ghiti.fr>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
2020-06-15 09:25:44 +05:30
Anup Patel
e2c3f01af4 lib: Fix __sbi_hfence_gvma_vmid_gpa() and __sbi_hfence_vvma_asid_va()
The arguments/parameters of __sbi_hfence_gvma_vmid_gpa() and
__sbi_hfence_vvma_asid_va() functions are swapped so we fix it.

Currently, we did not face any issues because QEMU does a full
TLB flush for all HFENCE instructions.

We also improve documentation of HFENCE.GVMA and HFENCE.VVMA
instruction encoding.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-06-15 09:24:27 +05:30
Anup Patel
1b8c0128f1 lib: Add RISC-V hypervisor v0.6.1 support
To support RISC-V hypervisor v0.6.1, we:
1. Don't need to explicitly forward WFI traps from VS/VU-mode
2. Have to delegate virtual instruction trap to HS-mode
3. Have to update trap redirection for changes in HSTATUS CSR

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-06-08 15:41:23 +05:30
Anup Patel
569dd64b72 lib: utils: Add fdt_parse_clint_node() function
We add fdt_parse_clint_node() function which will be used by
fdt_ipi_clint and fdt_timer_clint drivers to parse CLINT details
from DT node.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:46 +05:30
Anup Patel
a9a9751185 lib: utils: Allow CLINT functions to be used for multiple CLINTs
We extend CLINT cold init function to have a "struct clint_data *"
parameter pointing to CLINT details. This allows platforms to use
CLINT functions for multiple CLINT instances.

When multiple CLINTs are present, the platform can also provide
one of the CLINT as reference CLINT for other CLINTs. This will
help CLINTs to sync their time value with reference CLINT using
a time_delta computed in warm init function.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:43 +05:30
Anup Patel
2c685c214f lib: utils: Extend fdt_find_match() Implementation
We extend fdt_find_match() implementation by adding node offset
parameter which represents the first node to match from.

The improved fdt_find_match() can be used to find multiple
match nodes.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:33 +05:30
Anup Patel
446a9c6d1e lib: utils: Allow PLIC functions to be used for multiple PLICs
We extend all PLIC functions to have a "struct plic_data *"
parameter pointing to PLIC details. This allows platforms to
use these functions for multiple PLIC instances.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:29 +05:30
Anup Patel
73d6ef3b29 lib: utils: Remove redundant parameters from PLIC init functions
The "target_hart" and "hart_count" parameters of PLIC cold and
warm init functions are only used for sanity checks and not
required in PLIC initialization.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
2020-05-23 10:36:26 +05:30