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36 lines
748 B
36 lines
748 B
6 years ago
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#ifndef _VM_H
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#define _VM_H
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#include "encoding.h"
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#include <stdint.h>
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#define MEGAPAGE_SIZE ((uintptr_t)(RISCV_PGSIZE << RISCV_PGLEVEL_BITS))
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#if __riscv_xlen == 64
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# define SATP_MODE_CHOICE INSERT_FIELD(0, SATP64_MODE, SATP_MODE_SV39)
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# define VA_BITS 39
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# define GIGAPAGE_SIZE (MEGAPAGE_SIZE << RISCV_PGLEVEL_BITS)
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#else
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# define SATP_MODE_CHOICE INSERT_FIELD(0, SATP32_MODE, SATP_MODE_SV32)
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# define VA_BITS 32
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#endif
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typedef uintptr_t pte_t;
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extern pte_t* root_page_table;
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static inline void flush_tlb()
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{
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asm volatile ("sfence.vma");
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}
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static inline pte_t pte_create(uintptr_t ppn, int type)
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{
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return (ppn << PTE_PPN_SHIFT) | PTE_V | type;
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}
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static inline pte_t ptd_create(uintptr_t ppn)
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{
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return pte_create(ppn, PTE_V);
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}
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#endif
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