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arch: riscv: introduce a Kconfig to mask mhartid

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Configure a new Kconfig (`CONFIG_RISCV_HART_MASK`) so that it
is possible to mask the `mhartid` of a processor. This is
helpful in the cases when the hart id starts from non-zero
value.

Signed-off-by: Yong Cong Sin <ycsin@meta.com>
This commit is contained in:
Yong Cong Sin 2024-03-08 00:00:36 +08:00 • committed by Fabio Baltieri
commit 2262b294dd
2 changed files with 10 additions and 1 deletions
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9
arch/riscv/Kconfig
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@ -229,6 +229,15 @@ config RV_BOOT_HART
For RISC-V systems such as MPFS and FU540 this would be set to 1 to
skip the E51 HART 0 as it is not usable in SMP configurations.
config RISCV_HART_MASK
int
default -1
help
Configures the mask for the HART ID.
For RISC-V systems with HART ID starting from non-zero value,
i.e. 128, 129, ..(0x80, 8x81, ..), this can be configured to 63 (0x7f)
such that we can extract the bits that start from 0.
config RISCV_PMP
bool "RISC-V PMP Support"
select THREAD_STACK_INFO

2
include/zephyr/arch/riscv/arch_inlines.h
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@ -14,7 +14,7 @@
static ALWAYS_INLINE uint32_t arch_proc_id(void)
{
return csr_read(mhartid);
return csr_read(mhartid) & ((uintptr_t)CONFIG_RISCV_HART_MASK);
}
static ALWAYS_INLINE _cpu_t *arch_curr_cpu(void)