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Author SHA1 Message Date
Yu-Chien Peter LinandAnup Patel f36acaeb80 lib: utils: fdt_domain: add root-regions-inheritance policy 
Introduce root-regions-inheritance DT property to control
copying of root domain memregions. Support 'all' and 'm-only'
modes, always inheriting firmware and M-only regions; behavior
matches m-only policy when property is absent.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260516072906.1427203-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-05-18 18:20:50 +05:30
Yu-Chien Peter LinandAnup Patel 8cd279e321 lib: fdt_domain: Default boot-hart to coldboot HART for multi-domain boot 
When "boot-hart" is not specified, dom->boot_hartid was left as -1U,
causing domain context switching to fail. Default it to the coldboot
HART to enable SMP boot in multi-domain setups, consistent with how
next-arg1 is handled.

Also update its description in domain_support.md.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260327054936.3462935-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-05-11 10:11:06 +05:30
Yu-Chien Peter LinandAnup Patel 2257e99571 lib: sbi_bitmap_test: add tests for bitmap_empty() 
Add tests for bitmap_empty(), covers empty/non-empty bitmaps and
edge case nbits=0.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260311125116.1401002-2-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-04-08 17:58:06 +05:30
Yu-Chien Peter LinandAnup Patel ff7d245b86 include: sbi_bitmap: add bitmap_empty() function 
Add bitmap_empty() to check if bitmap has no bits set.

Unlike bitmap_weight() which calls sbi_popcount() on every word,
bitmap_empty() uses simple non-zero comparisons with early exit.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260311125116.1401002-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-04-08 17:58:05 +05:30
Yu-Chien Peter LinandAnup Patel 9e14e03032 sifive_dev_platform: Set default MMIO region when SmePMP is enabled 
Set a default MMIO region with a single SmePMP entry, which allows us
to save entries for M-mode only devices. The default entry has M-/S-mode
shared permission, so system-level resource protection, such as RISC-V
World extension and WorldGuard checker, will be introduced to protect
M-mode only region access from lower privilege modes.

Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Link: https://lore.kernel.org/r/20260224031733.3817148-3-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-04-06 11:04:33 +05:30
Yu-Chien Peter LinandAnup Patel 0402b8e3dc platform: sifive: Add initial support for SiFive development platform 
Add initial platform support for SiFive development platforms
with the "sifive-dev" compatible string.

Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Link: https://lore.kernel.org/r/20260224031733.3817148-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-04-06 10:49:21 +05:30
Yu-Chien Peter LinandAnup Patel 4813a20420 lib: sbi_init: Call hart init and timer init before platform early init 
To allow the platform early drivers to use the sbi_timer_mdelay(),
sbi_timer_udelay() and sbi_hart_has_extension() helpers, reorder the
initialization sequence must call sbi_hart_init() and sbi_timer_init()
prior to sbi_platform_early_init() during both cold and warm boot paths.

Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Link: https://lore.kernel.org/r/20260224031733.3817148-2-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2026-03-22 11:16:33 +05:30
Yu-Chien Peter LinandAnup Patel 0250db4dad lib: sbi_domain_context: preserve firmware PMP entries during domain context switch 
When SmePMP is enabled, clearing firmware PMP entries during a domain
context switch can temporarily revoke access to OpenSBI’s own code and
data, leading to faults.

Keep firmware PMP entries enabled across switches so firmware regions
remain accessible and executable.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-9-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 17:00:49 +05:30
Yu-Chien Peter LinandAnup Patel b210376fe2 lib: sbi: sbi_hart: track firmware PMP entries for SmePMP 
Add fw_smepmp_ids bitmap to track PMP entries that protect firmware
regions. Allow us to preserve these critical entries across domain
transitions and check inconsistent firmware entry allocation.

Also add sbi_hart_smepmp_is_fw_region() helper function to query
whether a given SmePMP entry protects firmware regions.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-8-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:49:47 +05:30
Yu-Chien Peter LinandAnup Patel 631efeeb49 lib: sbi_domain: ensure consistent firmware PMP entries 
During domain context switches, all PMP entries are reconfigured
which can clear firmware access permissions, causing M-mode access
faults under SmePMP.

Sort domain regions to place firmware regions first, ensuring
consistent firmware PMP entries so they won't be revoked during
domain context switches.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-7-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:35:19 +05:30
Yu-Chien Peter LinandAnup Patel b34caeef81 lib: sbi_domain: add SBI_DOMAIN_MEMREGION_FW memregion flag 
Add a new memregion flag, SBI_DOMAIN_MEMREGION_FW and mark the
OpenSBI code and data regions.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-6-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:26:19 +05:30
Yu-Chien Peter LinandAnup Patel 34657b377f lib: sbi_hart: return error when insufficient PMP entries available 
Previously, when memory regions exceed available PMP entries,
some regions were silently ignored. If the last entry that covers
the full 64-bit address space is not added to a domain, the next
stage S-mode software won't have permission to access and fetch
instructions from its memory. So return early with error message
to catch such situation.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-5-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:21:07 +05:30
Yu-Chien Peter LinandAnup Patel 90c3b94094 lib: sbi_domain: print unsupported SmePMP permissions 
The reg->flag is encoded with 6 bits to specify RWX
permissions for M-mode and S-/U-mode. However, only
16 of the possible encodings are valid on SmePMP.

Add a warning message when an unsupported permission
encoding is detected.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-4-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:06:51 +05:30
Yu-Chien Peter LinandAnup Patel 667eed2266 lib: sbi_domain: allow specifying inaccessible region 
According to the RISC‑V Privileged Specification, SmePMP
regions that grant no access in any privilege mode are
valid. Allow such regions to be specified.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-3-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 16:03:35 +05:30
Yu-Chien Peter LinandAnup Patel 32c1d38dcf lib: sbi_hart: move sbi_hart_get_smepmp_flags() to sbi_domain 
Move sbi_hart_get_smepmp_flags() from sbi_hart.c to sbi_domain.c and
rename it to sbi_domain_get_smepmp_flags() to better reflect its
purpose of converting domain memory region flags to PMP configuration.

Also removes unused parameters (scratch and dom).

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251008084444.3525615-2-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-11-02 15:55:57 +05:30
Yu-Chien Peter LinandAnup Patel 5de8c1d499 lib: serial: sifive-uart: add shared memory region for SiFive UART 
Add shared memory region so the driver has permission
to access it in OpenSBI.

Signed-off-by: Yu-Chien Peter Lin <peter.lin@sifive.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20250814111012.20151-1-peter.lin@sifive.com
Signed-off-by: Anup Patel <anup@brainfault.org>
 2025-10-06 11:13:20 +05:30