fix(smp): set SUM bit for kernel access to user mappings in multi-core #10
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Pull Request Overview
This PR fixes a multi-core (SMP) issue on RISC-V by enabling the SUM (Supervisor User Memory) bit during trap initialization, allowing the kernel to access user memory mappings across all CPU cores.
- Sets the SUM bit in sstatus register during per-CPU trap initialization
- Ensures consistent kernel-to-user memory access configuration across all cores in SMP systems
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