opensbi.git/include/sbi, branch v1.8

include: Bump-up version to 1.8

2025-12-29T06:54:16Z

Update the OpenSBI version to 1.8 as part of release preparation. Signed-off-by: Anup Patel

include: riscv_asm: Optimize csr_xyz() macros to reduce stack usage

2025-12-27T05:51:27Z

When using debug builds, aka., DEBUG=1, csr_write_num() function can trigger stack overflow. This is caused by the large amount of macro expansion of csr_write(...), which, under debug builds, will generate massive amount of stack variables (tested with GCC 13.2.0). The issue is masked previously as we didn't have too many csr_write()'s before commit 55296fd27c0c, but now, it does overflow the default 4KB stack. The csr_read(relaxed) macros already use the "register" modifier to optimize stack usage (perhaps unknowingly?), so this patch just follows suit. Fixes: 55296fd27c0c ("lib: Allow custom CSRs in csr_read_num() and csr_write_num()") Signed-off-by: Bo Gan Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251216052528.18896-1-ganboing@gmail.com Signed-off-by: Anup Patel

lib: sbi: give platform choice of using single memregion to cover OpenSBI

2025-12-21T15:03:23Z

By default the OpenSBI itself is covered by 2 memregions for RX/RW sections. This is required by platforms with Smepmp to enforce proper permissions in M mode. Note: M-mode only regions can't have RWX permissions with Smepmp. Platforms with traditional PMPs won't be able to benefit from it, as both regions are effectively RWX in M mode, but usually it's harmless to so. Now we provide these platforms with an option to disable this logic. It saves 1 PMP entry. For platforms really in short of PMPs, it does make a difference. Note: Platform requesting single OpenSBI memregion must be using traditional (old) PMP. We expect the platform code to do the right thing. Signed-off-by: Bo Gan Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251218104243.562667-5-ganboing@gmail.com Signed-off-by: Anup Patel

lib: sbi_domain: make is_region_subset public

2025-12-21T15:03:20Z

The helper function is renamed as sbi_domain_memregion_is_subset, and made public in header file. Also add a convenient helper of sbi_domain_for_each_memregion_idx. Signed-off-by: Bo Gan Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251218104243.562667-4-ganboing@gmail.com Signed-off-by: Anup Patel

lib: sbi_domain: add sbi_domain_get_oldpmp_flags

2025-12-21T15:03:18Z

Factor out logic in `sbi_hart_oldpmp_configure` into function `sbi_domain_get_oldpmp_flags`, analogous to `sbi_domain_get_smepmp_flags`. Platform specific hart-protection implementation can now leverage it. Signed-off-by: Bo Gan Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251218104243.562667-3-ganboing@gmail.com Signed-off-by: Anup Patel

lib: sbi_hart_pmp: make sbi_hart_pmp_fence public

2025-12-21T15:03:16Z

sbi_hart_pmp_fence can now be utilized by other hart-protection implementation. Signed-off-by: Bo Gan Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20251218104243.562667-2-ganboing@gmail.com Signed-off-by: Anup Patel

lib: sbi: Expose __sbi_sfence_vma_all() function

2025-12-16T14:49:21Z

The __sbi_sfence_vma_all() can be shared by different parts of OpenSBI so rename __tlb_flush_all() to __sbi_sfence_vma_all() and make it global function. Signed-off-by: Andrew Waterman Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20251127112121.334023-2-apatel@ventanamicro.com Signed-off-by: Anup Patel

lib: sbi: Factor-out PMP programming into separate sources

2025-12-16T14:46:47Z

The PMP programming is a significant part of sbi_hart.c so factor-out this into separate sources sbi_hart_pmp.c and sbi_hart_pmp.h for better maintainability. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20251209135235.423391-6-apatel@ventanamicro.com Signed-off-by: Anup Patel

lib: sbi: Replace sbi_hart_pmp_xyz() and sbi_hart_map/unmap_addr()

2025-12-16T14:46:47Z

The sbi_hart_pmp_xyz() and sbi_hart_map/unmap_addr() functions can now be replaced by various sbi_hart_protection_xyz() functions. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20251209135235.423391-5-apatel@ventanamicro.com Signed-off-by: Anup Patel

lib: sbi: Introduce hart protection abstraction

2025-12-16T14:46:47Z

Currently, PMP and ePMP are the only hart protection mechanisms available in OpenSBI but new protection mechanisms (such as Smmpt) will be added in the near future. To allow multiple hart protection mechanisms, introduce hart protection abstraction and related APIs. Signed-off-by: Anup Patel Link: https://lore.kernel.org/r/20251209135235.423391-3-apatel@ventanamicro.com Signed-off-by: Anup Patel