platform/kernel/opensbi.git
3 years agolib: sbi: Rename sbi_hsm_hart_started_mask() function
Anup Patel [Tue, 2 Feb 2021 04:21:54 +0000 (09:51 +0530)]
lib: sbi: Rename sbi_hsm_hart_started_mask() function

A hart can take interrupt in the new HSM states introduced by the
SBI HSM suspend function (such as SUSPENDED state) so we rename
sbi_hsm_hart_started_mask() to something more generic such as
sbi_hsm_hart_interruptible_mask().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agolib: sbi: Use SBI_HSM_STATE_xyz defines instead of SBI_STATE_xyz defines
Anup Patel [Mon, 1 Feb 2021 10:43:03 +0000 (16:13 +0530)]
lib: sbi: Use SBI_HSM_STATE_xyz defines instead of SBI_STATE_xyz defines

We replace the use of SBI_STATE_xyz defines with SBI_HSM_STATE_xyz
defines because the HSM state defines are complete enough to implement
HSM state machine in OpenSBI. As a result of this, we can now remove
sbi_hsm_hart_state_to_status() function because it is now redundant
and sbi_hsm_hart_get_state() can directly return HSM state or error.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agoinclude: sbi: Simplify HSM state define names
Anup Patel [Mon, 1 Feb 2021 04:42:47 +0000 (10:12 +0530)]
include: sbi: Simplify HSM state define names

We simplify HSM state define names so that these defines can directly
replace SBI_HART_xyz defines used by SBI HSM implementation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agoplatform: implement K210 system reset
Heinrich Schuchardt [Fri, 26 Feb 2021 09:25:10 +0000 (09:25 +0000)]
platform: implement K210 system reset

Implement rebooting the K210 via the system reset extension.

All reset types are treated in the same way.
A request for shutdown results in a reboot.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
3 years agoinclude: Bump-up version to 0.9 v0.9
Anup Patel [Mon, 18 Jan 2021 13:17:19 +0000 (18:47 +0530)]
include: Bump-up version to 0.9

This patch updates OpenSBI version to 0.9 as part of
release preparation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
3 years agoplatform: template: Fix compile error
Anup Patel [Mon, 18 Jan 2021 03:59:33 +0000 (09:29 +0530)]
platform: template: Fix compile error

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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agoinclude: sbi: Don't pack struct sbi_platform and sbi_platform_operations
Anup Patel [Mon, 11 Jan 2021 11:45:00 +0000 (17:15 +0530)]
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>
3 years agoinclude: sbi: No need to pack struct sbi_scratch
Anup Patel [Mon, 11 Jan 2021 11:15:14 +0000 (16:45 +0530)]
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>
3 years agoinclude: sbi: No need to pack struct sbi_trap_regs
Anup Patel [Mon, 11 Jan 2021 10:55:38 +0000 (16:25 +0530)]
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>
3 years agolib: sbi: Allow platforms to provide root domain memory regions
Anup Patel [Fri, 8 Jan 2021 04:37:01 +0000 (10:07 +0530)]
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>
3 years agolib: utils: Fix shakti uart implementation
Vijai Kumar K [Mon, 7 Dec 2020 16:54:16 +0000 (22:24 +0530)]
lib: utils: Fix shakti uart implementation

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 <vijai@behindbytes.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
3 years agolib: sbi: Allow custom local TLB flush function
Anup Patel [Tue, 29 Dec 2020 08:21:06 +0000 (13:51 +0530)]
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>
3 years agolib: sbi: Introduce sbi_trap_exit() API
Anup Patel [Tue, 29 Dec 2020 06:09:22 +0000 (11:39 +0530)]
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>
3 years agolib: sbi: Replace args with trap registers in ecall handler
Anup Patel [Mon, 28 Dec 2020 12:55:18 +0000 (18:25 +0530)]
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>
3 years agolib: sbi: Fix sign-extension in sbi_misaligned_load_handler()
Anup Patel [Sat, 19 Dec 2020 12:09:57 +0000 (17:39 +0530)]
lib: sbi: Fix sign-extension in sbi_misaligned_load_handler()

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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agolib: sbi: Remove domain_get() platform callback function
Anup Patel [Sun, 13 Dec 2020 10:14:22 +0000 (15:44 +0530)]
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>
3 years agolib: utils: Remove fdt_domain_get() function
Anup Patel [Sun, 13 Dec 2020 10:07:34 +0000 (15:37 +0530)]
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>
3 years agolib: sbi: Add function to register new domain
Anup Patel [Sun, 13 Dec 2020 09:39:42 +0000 (15:09 +0530)]
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>
3 years agolib: utils: Allow FDT domain iteration functions to fail
Anup Patel [Sun, 13 Dec 2020 05:53:05 +0000 (11:23 +0530)]
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>
3 years agolib: utils/libfdt: Upgrade to v1.6.0 release
Dimitri John Ledkov [Thu, 10 Dec 2020 11:03:57 +0000 (11:03 +0000)]
lib: utils/libfdt: Upgrade to v1.6.0 release

Sync with libfdt v1.6.0 release source codes.

Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
3 years agoplatform: generic: Populate domains from FDT
Anup Patel [Thu, 19 Nov 2020 06:55:31 +0000 (12:25 +0530)]
platform: generic: Populate domains from FDT

The generic platform should populate domains from FDT using the
domain FDT helper routines.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agolib: utils: Add helper routines to populate domains from FDT
Anup Patel [Wed, 18 Nov 2020 11:10:21 +0000 (16:40 +0530)]
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>
3 years agodocs: Add domain device tree binding documentation
Anup Patel [Sun, 15 Nov 2020 10:07:21 +0000 (15:37 +0530)]
docs: Add domain device tree binding documentation

This patch adds domain device tree binding documentation in the
OpenSBI domain support documentation.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agoinclude: sbi: Add domains_init() platform operation
Anup Patel [Fri, 20 Nov 2020 11:12:15 +0000 (16:42 +0530)]
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>
3 years agolib: sbi: Add error prints in sbi_domain_finalize()
Anup Patel [Sun, 15 Nov 2020 09:41:21 +0000 (15:11 +0530)]
lib: sbi: Add error prints in sbi_domain_finalize()

We add error prints in sbi_domain_finalize() and sanitize_domain()
to help debug domain configuration issues.

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>
3 years agolib: sbi: Override domain boot HART when coldboot HART assigned to it
Anup Patel [Sun, 15 Nov 2020 08:00:29 +0000 (13:30 +0530)]
lib: sbi: Override domain boot HART when coldboot HART assigned to it

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 <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agoinclude: sbi: Use lower bits for domain memory region permissions
Anup Patel [Sun, 15 Nov 2020 06:16:20 +0000 (11:46 +0530)]
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>
3 years agolib: sbi: Auto start domain only if boot HART within limits
Anup Patel [Wed, 11 Nov 2020 05:13:11 +0000 (10:43 +0530)]
lib: sbi: Auto start domain only if boot HART within limits

The sbi_domain_finalize() should auto start a domain only if the
boot HART is withing limits (i.e. less than SBI_HARTMASK_MAX_BITS).

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>
3 years agolib: sbi: Fix domain_count check in sbi_domain_finalize()
Anup Patel [Fri, 20 Nov 2020 04:47:38 +0000 (10:17 +0530)]
lib: sbi: Fix domain_count check in sbi_domain_finalize()

The domain_count check in sbi_domain_finalize() for newly discovered
domain is incorrect and should be reversed.

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>
3 years agolib: sbi: Fix typo in sbi_domain_finalize()
Anup Patel [Wed, 11 Nov 2020 04:01:39 +0000 (09:31 +0530)]
lib: sbi: Fix typo in sbi_domain_finalize()

There has been typo in automatic domain boot hart startup
for non-root domains so this patch fixes it.

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>
3 years agolib: sbi: Fix sbi_hart_switch_mode() for u-mode
Anup Patel [Sat, 21 Nov 2020 05:58:39 +0000 (11:28 +0530)]
lib: sbi: Fix sbi_hart_switch_mode() for u-mode

We should check and access N-extension CSRs in sbi_hart_switch_mode()
when next_mode is u-mode because N-extension is optional.

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>
3 years agofirmware: fw_base: Optimize trap handler for RV32 systems
Anup Patel [Sun, 22 Nov 2020 06:17:22 +0000 (11:47 +0530)]
firmware: fw_base: Optimize trap handler for RV32 systems

On RV32 systems, we have two CSRs for M-mode status (MSTATUS and
MSTATUSH) when H-extension is implemented. This means we have to
save/restore MSTATUSH for RV32 systems only when H-extension is
implemented. The current _trap_handler() has extra instructions
(roughly 10) for conditional save/restore of MSTATUSH CSR.

These extra instructions in RV32 _trap_handler() can be avoided
if we create separate low-level trap handler for RV32 systems
having H-extension. This patch optimizes low-level trap handler
for RV32 systems accordingly.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
3 years agolib: sbi: Implement System Reset (SRST) SBI extension
Anup Patel [Tue, 24 Nov 2020 08:50:19 +0000 (14:20 +0530)]
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>
3 years agolib: sbi: Improve system reset platform operations
Anup Patel [Tue, 24 Nov 2020 06:29:05 +0000 (11:59 +0530)]
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>
3 years agoplatform: Remove dummy system reset functions
Anup Patel [Tue, 24 Nov 2020 05:48:27 +0000 (11:18 +0530)]
platform: Remove dummy system reset functions

Few platforms have dummy system reset functions so let's remove
these dummy system reset functions to allow generic code deal
with it in the right way.

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>
3 years agoinclude: sbi: Remove opensbi specific reset type defines
Anup Patel [Tue, 24 Nov 2020 04:43:16 +0000 (10:13 +0530)]
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>
3 years agoinclude: sbi: Add SBI SRST extension related defines
Anup Patel [Tue, 24 Nov 2020 04:20:00 +0000 (09:50 +0530)]
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>
3 years agodocs: fix a typo error
Yuan Li [Wed, 25 Nov 2020 15:13:19 +0000 (23:13 +0800)]
docs: fix a typo error

fix a typo error in docs/platform/sifive_fu540.md

Signed-off-by: Yuan Li <dskwelmcy@163.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
3 years agolib: sbi: Improve boot prints in cold boot sequence
Anup Patel [Wed, 4 Nov 2020 09:46:20 +0000 (15:16 +0530)]
lib: sbi: Improve boot prints in cold boot sequence

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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoMakefile: Add option to use toolchain default ABI and ISA string
Anup Patel [Tue, 20 Oct 2020 04:59:43 +0000 (10:29 +0530)]
Makefile: Add option to use toolchain default ABI and ISA string

When PLATFORM_RISCV_ABI and PLATFORM_RISCV_ISA are not specified,
we force "-mabi=lp64 -march=rv64gc" for RV64 and force "-mabi=ilp32
-march=rv32gc" for RV32. This can prevent users from using the
toolchain default "-mabi" and "-march" options.

To allow using toolchain defaults, we add compile-time option
PLATFORM_RISCV_TOOLCHAIN_DEFAULT which when enabled forces the
top-level makefile to use toolchain default ABI and ISA string.

To enable the option, pass "PLATFORM_RISCV_TOOLCHAIN_DEFAULT=1"
to top-level make.

Reported-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
4 years agolib: sbi: Improve boot time print with additional PMP information
Atish Patra [Mon, 26 Oct 2020 21:03:34 +0000 (14:03 -0700)]
lib: sbi: Improve boot time print with additional PMP information

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 <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agolib: sbi: Detect PMP granularity and number of address bits
Atish Patra [Mon, 26 Oct 2020 21:03:33 +0000 (14:03 -0700)]
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>
4 years agolib: utils: Implement "ranges" property parsing
Atish Patra [Fri, 23 Oct 2020 22:47:39 +0000 (15:47 -0700)]
lib: utils: Implement "ranges" property parsing

The "reg" property in a device node may not be the correct address always.
If a parent node defines a "ranges" property, the child address need to be
translated with respect to parents address. If the ranges property is not
present, it will just use 1:1 translation.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agodocs: Add initial documentation for domain support
Anup Patel [Thu, 24 Sep 2020 09:45:31 +0000 (15:15 +0530)]
docs: Add initial documentation for domain support

We add initial documentation for OpenSBI domain support to help
RISC-V platform vendors achieve system-level partitioning.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Display domain details in boot prints
Anup Patel [Wed, 23 Sep 2020 16:19:01 +0000 (21:49 +0530)]
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>
4 years agolib: sbi: Configure PMP based on domain memory regions
Anup Patel [Tue, 22 Sep 2020 10:06:15 +0000 (15:36 +0530)]
lib: sbi: Configure PMP based on domain memory regions

The PMP configuration on each HART should be only based on the memory
regions of the assigned domain because each domain includes a memory
region to protect the underlying firmware.

This patch updates the sbi_hart_pmp_configure() function accordingly.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Remove redundant sbi_hart_pmp_xyz() functions
Anup Patel [Tue, 22 Sep 2020 05:42:51 +0000 (11:12 +0530)]
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>
4 years agolib: utils: Update fdt_cpu_fixup() to use current domain
Anup Patel [Tue, 22 Sep 2020 09:10:08 +0000 (14:40 +0530)]
lib: utils: Update fdt_cpu_fixup() to use current domain

The fdt_cpu_fixup() should disable a HART in DT if the HART
is not assigned to the current HART domain. This patch updates
fdt_cpu_fixup() accordingly.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: utils: Update fdt_reserved_memory_fixup() to use current domain
Anup Patel [Mon, 21 Sep 2020 10:28:14 +0000 (15:58 +0530)]
lib: utils: Update fdt_reserved_memory_fixup() to use current domain

Now that each HART is mapped to a domain having a set of memory
regions, we update fdt_reserved_memory_fixup() to use domain memory
regions for adding reserved memory nodes in device tree.

We also change reserved memory node name prefix from "mmode_pmp"
to "mmode_resv" because domain memory regions can impact other
hardware configurations (such as IOPMP, etc) along with PMP.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Extend sbi_system_reset() for domains
Anup Patel [Sat, 19 Sep 2020 11:53:46 +0000 (17:23 +0530)]
lib: sbi: Extend sbi_system_reset() for domains

The sbi_system_reset() should issue platform system reset only if
domain of current HART is allowed to do system reset.

This patch extends sbi_system_reset() as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Optimize sbi_hsm_hart_started_mask() implementation
Anup Patel [Fri, 25 Sep 2020 04:38:24 +0000 (10:08 +0530)]
lib: sbi: Optimize sbi_hsm_hart_started_mask() implementation

Instead of calling sbi_hsm_hart_get_state() in a loop, we can simply
call a new inline __sbi_hsm_hart_get_state() which only takes "hartid"
and enforce domain checks using sbi_domain_assigned_hartmask().

This patch optimizes sbi_hsm_hart_started_mask() as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Extend sbi_hsm_hart_start() for domains
Anup Patel [Sat, 19 Sep 2020 08:56:52 +0000 (14:26 +0530)]
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>
4 years agolib: sbi: Extend sbi_hsm_hart_started_mask() for domains
Anup Patel [Thu, 24 Sep 2020 12:19:27 +0000 (17:49 +0530)]
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>
4 years agolib: sbi: Add initial domain support
Anup Patel [Fri, 18 Sep 2020 11:37:49 +0000 (17:07 +0530)]
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>
4 years agoinclude: sbi: Make hartmask pointer const in sbi_hartmask_test_hart()
Anup Patel [Thu, 24 Sep 2020 10:34:02 +0000 (16:04 +0530)]
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>
4 years agolib: sbi: Remove redundant hartid parameter from sbi_hart_init()
Anup Patel [Sun, 20 Sep 2020 08:19:02 +0000 (13:49 +0530)]
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>
4 years agolib: sbi: Configure PMP late in coldboot and warmboot path
Anup Patel [Sun, 20 Sep 2020 04:39:32 +0000 (10:09 +0530)]
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>
4 years agoinclude: sbi: Remove pmp_region callbacks from sbi_platform_operations
Anup Patel [Thu, 17 Sep 2020 10:34:55 +0000 (16:04 +0530)]
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>
4 years agoinclude: sbi: Remove redundant includes from sbi_platform.h
Anup Patel [Thu, 17 Sep 2020 10:21:00 +0000 (15:51 +0530)]
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>
4 years agoplatform: kendryte/k210: Add some padding for FDT fixups
Anup Patel [Thu, 15 Oct 2020 04:57:57 +0000 (10:27 +0530)]
platform: kendryte/k210: Add some padding for FDT fixups

The Kendryte K210 platform has built-in DTB and does not provides
FW_PAYLOAD_FDT_ADDR. This means the FDT fixups will be done on
the built-in DTB in absence of FW_PAYLOAD_FDT_ADDR. This patch
adds some padding in built-in DTB for FDT fixups.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoMakefile: Allow padding zeros when converting DTB to C source
Heinrich Schuchardt [Wed, 14 Oct 2020 16:35:31 +0000 (22:05 +0530)]
Makefile: Allow padding zeros when converting DTB to C source

We extend d2c.sh to allow padding zeros in output C source when
converting DTB to C source. Using this feature, platforms can
create extra room for in-place FDT fixups on built-in DTBs.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agofirmware: Remove FW_PAYLOAD_FDT_PATH compile-time option
Anup Patel [Wed, 14 Oct 2020 11:13:34 +0000 (16:43 +0530)]
firmware: Remove FW_PAYLOAD_FDT_PATH compile-time option

The FW_PAYLOAD_FDT_PATH compile-time option is replaced by
FW_FDT_PATH compile-time option which is more flexible and
common across all OpenSBI firmwares.

This patch removes FW_PAYLOAD_FDT_PATH and updates related
documentation to use FW_FDT_PATH.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agofirmware: Add common FW_FDT_PATH compile-time option
Anup Patel [Wed, 14 Oct 2020 10:33:35 +0000 (16:03 +0530)]
firmware: Add common FW_FDT_PATH compile-time option

Currently, only FW_PAYLOAD has mechanism to embed external
FDT using FW_PAYLOAD_FDT_PATH compile-time option.

This patch adds a common FW_FDT_PATH compile-time option to
embed external FDT for all OpenSBI firmwares (i.e FW_JUMP,
FW_PAYLOAD, and FW_DYNAMIC).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoMakefile: Build ELF, BIN and LD script in platform build directory
Anup Patel [Wed, 14 Oct 2020 08:14:18 +0000 (13:44 +0530)]
Makefile: Build ELF, BIN and LD script in platform build directory

Currently, the make rules for ELF, BIN and LD script are little
generic to allowing ELF, BIN and LD script to be anywhere in the
build directory. For OpenSBI firmwares, the ELF, BIN, and LD script
are always platform specific so we update make rules accordingly.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agomakefile: fix clean directive
Damien Le Moal [Mon, 5 Oct 2020 14:55:53 +0000 (23:55 +0900)]
makefile: fix clean directive

Add cleaning of compiled device tree files (.dtb files).

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agolib: sbi_scratch: typo scatch
Heinrich Schuchardt [Thu, 1 Oct 2020 10:27:47 +0000 (12:27 +0200)]
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>
4 years agolib: sbi: Fix PMP CSR detection
Pragnesh Patel [Wed, 23 Sep 2020 07:14:17 +0000 (12:44 +0530)]
lib: sbi: Fix PMP CSR detection

HiFive unleashed currently implements fewer than 56 bits of physical
address so existing PMP CSR detection is broken.

PMP address register encodes bits 55-2 of a 56-bit physical address,
Not all physical address bits may be implemented, So just check
minimum 1 bit.

Fixes: 74d1db706293 ("lib: sbi: Improve PMP CSR detection and
progamming")

Signed-off-by: Pragnesh Patel <pragnesh.patel@sifive.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agoplatform: generic: Don't mark non-MMU HARTs as invalid
Anup Patel [Wed, 9 Sep 2020 08:24:03 +0000 (13:54 +0530)]
platform: generic: Don't mark non-MMU HARTs as invalid

Currently, the generic platform fw_platform_init() marks non-MMU
HARTs (e.g. E-core on SiFive Unleashed) as invalid. This means
such non-MMU HARTs won't be allowed to go ahead by sbi_init().

The sbi_init() now has a check for next stage privilege mode when
selecting coldboot HART. This check will force non-MMU HARTS (i.e.
HARTs without S-mode) to proceed in warmboot path and wait in the
HSM STOPPED state. This means we don't need to mark non-MMU HARTs
as invalid in generic platform fw_platform_init().

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Ensure coldboot HART supports next privilege mode
Anup Patel [Wed, 9 Sep 2020 03:49:09 +0000 (09:19 +0530)]
lib: sbi: Ensure coldboot HART supports next privilege mode

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 <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: utils: Improve fdt_cpu_fixup() implementation
Anup Patel [Mon, 7 Sep 2020 13:46:27 +0000 (19:16 +0530)]
lib: utils: Improve fdt_cpu_fixup() implementation

The fdt_cpu_fixup() should work fine even if HARTs without MMU
are not marked invalid by platform support code.

In future, we plan to treat HARTs without MMU as valid in the
generic platform support so that we can hold these HARTs in
HSM STOPPED state.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Allow specifying mode in sbi_hart_pmp_check_addr() API
Anup Patel [Mon, 7 Sep 2020 10:20:33 +0000 (15:50 +0530)]
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>
4 years agolib: sbi: Allow specifying start mode to sbi_hsm_hart_start() API
Anup Patel [Mon, 7 Sep 2020 05:41:29 +0000 (11:11 +0530)]
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>
4 years agolib: sbi_trap: Allow M-mode to M-mode ECALLs
Anup Patel [Fri, 4 Sep 2020 11:09:49 +0000 (16:39 +0530)]
lib: sbi_trap: Allow M-mode to M-mode ECALLs

We should allow M-mode to M-mode ECALLs because:
1. No other mode can handle M-mode ECALLs
2. In future, we can allow M-mode baremetal application (not
   linked to OpenSBI) running independently and cooperatively
   without corrupting OpenSBI M-mode state (CSRs and memory).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoinclude: Rename ECALL defines to match latest RISC-V spec
Anup Patel [Tue, 1 Sep 2020 12:24:29 +0000 (17:54 +0530)]
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>
4 years agolib: sbi: Don't handle VS-mode ecall in sbi_trap_handler()
Anup Patel [Tue, 1 Sep 2020 12:20:14 +0000 (17:50 +0530)]
lib: sbi: Don't handle VS-mode ecall in sbi_trap_handler()

The VS-mode ecall is supposed to be handled by HS-mode so
sbi_trap_handler() should fallback to default case for
VS-mode ecall trap.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi: Improve HPM CSR read/write emulation
Anup Patel [Fri, 21 Aug 2020 12:54:14 +0000 (18:24 +0530)]
lib: sbi: Improve HPM CSR read/write emulation

We improve HPM CSR read/write emulation as follows:
1. Fail for unimplemented counters so that trap is redirected
   to S-mode which can further help debugging S-mode software.
2. Check permissions in both MCOUNTEREN and SCOUNTEREN for
   HS-mode and U-mode.
3. Don't check permissions for TIME CSR because we emulate
   TIME CSR for both Host (HS/U-mode) and Guest (VS/VU-mode).
   Also, faster TIME CSR read is very helpful for good
   performance of S-mode software.
4. Don't emulate S-mode CSR read/write to M-mode HPM CSRs
   because these should not be accessible to S-mode software.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoinclude: sbi: Few cosmetic changes in riscv_encoding.h
Anup Patel [Fri, 21 Aug 2020 12:49:32 +0000 (18:19 +0530)]
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>
4 years agolib: sbi: Detect and print MHPM counters at boot-time
Anup Patel [Wed, 19 Aug 2020 12:01:37 +0000 (17:31 +0530)]
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>
4 years agolib: sbi: Improve PMP CSR detection and progamming
Anup Patel [Tue, 18 Aug 2020 07:58:08 +0000 (13:28 +0530)]
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>
4 years agolib: sbi: Remove redundant SBI_HART_HAS_PMP feature
Anup Patel [Tue, 18 Aug 2020 06:21:16 +0000 (11:51 +0530)]
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>
4 years agolib: sbi: Handle the case where MTVAL has illegal instruction address
Anup Patel [Sat, 15 Aug 2020 16:47:58 +0000 (22:17 +0530)]
lib: sbi: Handle the case where MTVAL has illegal instruction address

The Kendryte K210 follows RISC-V v1.9 spec so MTVAL has instruction
address (instead of instruction encoding) on illegal instruction trap.

To handle above case, we fix sbi_illegal_insn_handler() without any
impact on RISC-V v1.10 (or higher) systems. This achieved by exploiting
the fact that program counter (and instruction address) is always 2-byte
aligned in RISC-V world.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi_init: Avoid thundering hurd problem with coldboot_lock
Anup Patel [Sat, 15 Aug 2020 14:11:11 +0000 (19:41 +0530)]
lib: sbi_init: Avoid thundering hurd problem with coldboot_lock

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 <anup.patel@wdc.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
4 years agoplatform: kendryte/k210: fixup FDT
Heinrich Schuchardt [Tue, 18 Aug 2020 15:48:37 +0000 (17:48 +0200)]
platform: kendryte/k210: fixup FDT

When passing the device tree to the next stage we should apply necessary
device tree fix-ups first. These include:

* fix up the CPU node in the device tree
* fix up the PLIC node in the device tree
* fix up the reserved memory node in the device tree

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi_trap: Fix hstatus.SPVP update in sbi_trap_redirect()
Georg Kotheimer [Fri, 14 Aug 2020 21:01:29 +0000 (23:01 +0200)]
lib: sbi_trap: Fix hstatus.SPVP update in sbi_trap_redirect()

When redirecting from VS/VU-mode to HS-mode, hstatus.SPVP was set
to the value of mstatus.SPP, as according to the specification both
flags should be set to the same value.
However, the assignment of SPVP takes place before SPP itself is
updated, which results in SPVP having an outdated value.

Signed-off-by: Georg Kotheimer <georg.kotheimer@tu-dresden.de>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agofirmware: fw_base: Improve exception stack setup in trap handler
Anup Patel [Mon, 10 Aug 2020 13:07:46 +0000 (18:37 +0530)]
firmware: fw_base: Improve exception stack setup in trap handler

Currently, the low-level trap handler (i.e. _trap_handler()) uses
branch instructions to conditionally setup exception stack based
on which mode trap occured.

This patch implements exception stack setup using xor instructions
which is faster with same number of instructions due to lack of
branch instructions.

The new exception stack setup approach can be best described by the
following pseudocode:

 Came_From_M_Mode = ((MSTATUS.MPP < PRV_M) ? 1 : 0) - 1;
 Exception_Stack = TP ^ (Came_From_M_Mode & (SP ^ TP))

 Came_From_M_Mode = 0    ==>    Exception_Stack = TP
 Came_From_M_Mode = -1   ==>    Exception_Stack = SP

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: sbi_misaligned_ldst: Determine transformed instruction length correctly
Anup Patel [Wed, 29 Jul 2020 11:40:16 +0000 (17:10 +0530)]
lib: sbi_misaligned_ldst: Determine transformed instruction length correctly

If MTINST[0:0] bit is 1 then we have transformed instruction encoding
in MTINST CSR. For transformed instructions, if the MTINST[1:1] bit
is Zero then original trapped instruction was a 16bit instruction
which was converted to 32bit instruction at time of taking trap.

We should use MTINST[1:1] bit to determine correct instruction length
of transformed instruction.

This patch updates misaligned load/store emulation as-per above.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agolib: utils: Use strncmp in fdt_parse_hart_id()
Abner Chang [Sat, 25 Jul 2020 09:30:41 +0000 (17:30 +0800)]
lib: utils: Use strncmp in fdt_parse_hart_id()

Use strncmp instead of using sbi_strcmp directly in fdt_parse_hart_id()
to allow compiling fdt_helper.c by external firmware.

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>
4 years agolib: utils: Add a macro in libfdt_env.h for strncmp
Abner Chang [Sat, 25 Jul 2020 09:30:40 +0000 (17:30 +0800)]
lib: utils: Add a macro in libfdt_env.h for strncmp

This commit add a macro to replace strncmp with 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>
4 years agolib: Add sbi_strncmp implementation
Abner Chang [Sat, 25 Jul 2020 09:30:39 +0000 (17:30 +0800)]
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>
4 years agoinclude: sbi_bitops: Remove dead shift assignment in ffs/fls
Tobias Klauser [Tue, 7 Jul 2020 09:56:55 +0000 (11:56 +0200)]
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>
4 years agolib/utils: fdt: Update FDT expand size to 1024 for reserved memory node
Bin Meng [Thu, 25 Jun 2020 09:36:39 +0000 (02:36 -0700)]
lib/utils: fdt: Update FDT expand size to 1024 for reserved memory node

Currently 256 bytes is used for the FDT expand size when fixing up
reserved memory node. Increase it to 1024 bytes with an estimated
size of 64 bytes per PMP memory region by 16 regions in total.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoREADME.md: fix markdown link formatting
Tobias Klauser [Wed, 1 Jul 2020 13:07:08 +0000 (15:07 +0200)]
README.md: fix markdown link formatting

Consistently use reference-style markdown links in the README. This
won't show the URL next to the linked text for the [Github] and [U-Boot]
links and link the text "Bootlin toolchain repository" instead of
showing it verbatim with the URL next to it.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Reviewed-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agodocs/platform: sifive_fu540: Update U-Boot instructions
Bin Meng [Fri, 26 Jun 2020 01:26:04 +0000 (18:26 -0700)]
docs/platform: sifive_fu540: Update U-Boot instructions

U-Boot v2020.07 release adds SPL support to SiFive HiFive Unleashed.
Update the doc to mention that detailed build instructions are in the
U-Boot doc.

This also adds detailed command line description to show how to boot
U-Boot v2020.07 S-mode payload in the QEMU chapter.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoconfig.mk: Update QEMU run command for generic and sifive fu540 platforms
Bin Meng [Fri, 26 Jun 2020 01:26:03 +0000 (18:26 -0700)]
config.mk: Update QEMU run command for generic and sifive fu540 platforms

Since QEMU v5.1, if there is no "-bios" option provided, the default
OpenSBI firmware will be loaded by QEMU as the BIOS automatically,
hence to load fw_payload type image, we should explicitly pass the
"-bios" option to QEMU.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agodocs/platform: Update QEMU parameter for fw_payload
Bin Meng [Fri, 26 Jun 2020 01:26:02 +0000 (18:26 -0700)]
docs/platform: Update QEMU parameter for fw_payload

Since QEMU v5.1, if there is no "-bios" option provided, the default
OpenSBI firmware will be loaded by QEMU as the BIOS automatically,
hence to load fw_payload type image, we should explicitly pass the
"-bios" option to QEMU.

Signed-off-by: Bin Meng <bin.meng@windriver.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
4 years agoinclude: Bump-up version to 0.8 v0.8
Anup Patel [Sat, 20 Jun 2020 06:27:24 +0000 (11:57 +0530)]
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>
4 years agolib: Don't return any invalid error from SBI ecall
Anup Patel [Wed, 10 Jun 2020 13:09:53 +0000 (18:39 +0530)]
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>
4 years agolib: sbi: Fix 32/64 bits variable compatibility
Liush [Fri, 19 Jun 2020 03:55:19 +0000 (11:55 +0800)]
lib: sbi: Fix 32/64 bits variable compatibility

On RV64,"unsigned long" is 64bit and "unsigned int" is 32bit. So in
function "pmp_get" and "pmp_set", if "pmpcfg_shift >= 32", "0xff << pmpcfg_shift"
will go beyond "unsigned int" width. This patch tries to fix this issue.

In function 'pmp_get':
cfgmask = (0xff << pmpcfg_shift);
-->
cfgmask = (0xffUL << pmpcfg_shift);
In function 'pmp_set':
cfgmask = ~(0xff << pmpcfg_shift);
-->
cfgmask = ~(0xffUL << pmpcfg_shift);

Signed-off-by: Liush <liush.damon@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
4 years agoplatform: Add support for Shakti C-class SoC from IIT-M
Vijai Kumar K [Wed, 17 Jun 2020 13:55:16 +0000 (19:25 +0530)]
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>
4 years agolib: Fix the SBI_HART_HAS_MCOUNTEREN feature check
Alistair Francis [Wed, 17 Jun 2020 00:07:33 +0000 (17:07 -0700)]
lib: Fix the SBI_HART_HAS_MCOUNTEREN feature check

Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>