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e958eb5cf3fd926ef4c085c49144ff0f8735cfd0
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Author SHA1 Message Date
Jamie Iles
e958eb5cf3 RISC-V: preserve a1 in mcount 
The RISC-V ELF psABI states that both a0 and a1 are used for return
values so we should preserve them both in return_to_handler.  This is
especially important for RV32 for functions returning a 64-bit quantity
otherwise the return value can be corrupted and undefined behaviour
results.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Link: https://lore.kernel.org/r/20221115200832.706370-4-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
 2026-08-09 22:38:51 -07:00
Jamie Iles
b2371299bf RISC-V: reduce mcount save space on RV32 
For RV32 we can reduce the size of the ABI save+restore state by using
SZREG so that register stores are packed rather than on an 8 byte
boundary.

Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20221115200832.706370-3-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
 2026-08-09 22:38:51 -07:00
Jamie Iles
0f11a52582 RISC-V: use REG_S/REG_L for mcount 
In preparation for rv32i ftrace support, convert mcount routines to use
native sized loads/stores.

Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Link: https://lore.kernel.org/r/20221115200832.706370-2-jamie@jamieiles.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
 2026-08-09 22:38:51 -07:00
Sebastien Van Cauwenberghe
8b12b26dd9 riscv: Align on L1_CACHE_BYTES when STRICT_KERNEL_RWX 
Allows the sections to be aligned on smaller boundaries and
therefore results in a smaller kernel image size.

Signed-off-by: Sebastien Van Cauwenberghe <svancau@gmail.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
 2026-08-09 22:38:51 -07:00
Mohamad Noor Alim Hussin
7e9a098f27 drivers: add dma spinal dmesg driver 
Signed-off-by: Dolu1990 <charles.papon.90@gmail.com>
Signed-off-by: Mohamad Noor Alim Hussin <mnalim@efinixinc.com>
 2026-08-09 22:38:51 -07:00
Mohamad Noor Alim Hussin
270244937f drivers: add serial spinal driver 
Signed-off-by: Dolu1990 <charles.papon.90@gmail.com>
Signed-off-by: Mohamad Noor Alim Hussin <mnalim@efinixinc.com>
 2026-08-09 22:38:51 -07:00
Mohamad Noor Alim Hussin
31e941effe drivers: add gpio spinal driver 
Signed-off-by: Dolu1990 <charles.papon.90@gmail.com>
Signed-off-by: Mohamad Noor Alim Hussin <mnalim@efinixinc.com>
 2026-08-09 22:38:50 -07:00
Mohamad Noor Alim Hussin
1e5fdcf21c drivers: add spi spinal driver 
Signed-off-by: Dolu1990 <charles.papon.90@gmail.com>
Signed-off-by: Mohamad Noor Alim Hussin <mnalim@efinixinc.com>
 2026-08-09 22:38:50 -07:00
Byron Lathi
9d0aeafebd initial commit 2026-08-09 22:38:33 -07:00