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| -rw-r--r-- | libcpu/risc-v/common64/mmu.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/libcpu/risc-v/common64/mmu.c b/libcpu/risc-v/common64/mmu.c index 68c9e771b1..d349b669c8 100644 --- a/libcpu/risc-v/common64/mmu.c +++ b/libcpu/risc-v/common64/mmu.c @@ -630,6 +630,19 @@ void rt_hw_mmu_setup(rt_aspace_t aspace, struct mem_desc *mdesc, int desc_nr) } #define SATP_BASE ((rt_ubase_t)SATP_MODE << SATP_MODE_OFFSET) + +/** + * @brief Early memory setup function for hardware initialization. + * + * This function performs early memory setup tasks, including: + * - Calculating the physical-to-virtual (PV) offset. + * - Setting up initial page tables for identity mapping and text region relocation. + * - Applying new memory mappings by updating the SATP register. + * + * @note This function is typically called during the early stages of system initialization (startup_gcc.S), + * before the memory management system is fully operational. + * Here the identity mapping is implemented by a 1-stage page table, whose page size is 1GB. + */ void rt_hw_mem_setup_early(void) { rt_ubase_t pv_off; |