/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2021-01-30 lizhirui first version * 2021-05-03 lizhirui porting to c906 * 2023-10-12 Shell Add permission control API */ #ifndef __RISCV_MMU_H__ #define __RISCV_MMU_H__ #include <rtthread.h> #include <rthw.h> #include "riscv.h" #undef PAGE_SIZE /* C-SKY extend */ #define PTE_SEC (1UL << 59) /* Security */ #define PTE_SHARE (1UL << 60) /* Shareable */ #define PTE_BUF (1UL << 61) /* Bufferable */ #define PTE_CACHE (1UL << 62) /* Cacheable */ #define PTE_SO (1UL << 63) /* Strong Order */ #define PAGE_OFFSET_SHIFT 0 #define PAGE_OFFSET_BIT 12 #define PAGE_SIZE __SIZE(PAGE_OFFSET_BIT) #define PAGE_OFFSET_MASK __MASK(PAGE_OFFSET_BIT) #define VPN0_SHIFT (PAGE_OFFSET_SHIFT + PAGE_OFFSET_BIT) #define VPN0_BIT 9 #define VPN1_SHIFT (VPN0_SHIFT + VPN0_BIT) #define VPN1_BIT 9 #define VPN2_SHIFT (VPN1_SHIFT + VPN1_BIT) #define VPN2_BIT 9 #define PPN0_SHIFT (PAGE_OFFSET_SHIFT + PAGE_OFFSET_BIT) #define PPN0_BIT 9 #define PPN1_SHIFT (PPN0_SHIFT + PPN0_BIT) #define PPN1_BIT 9 #define PPN2_SHIFT (PPN1_SHIFT + PPN1_BIT) #define PPN2_BIT 26 #define L1_PAGE_SIZE __SIZE(PAGE_OFFSET_BIT + VPN0_BIT + VPN1_BIT) #define L2_PAGE_SIZE __SIZE(PAGE_OFFSET_BIT + VPN0_BIT) #define L3_PAGE_SIZE __SIZE(PAGE_OFFSET_BIT) #define ARCH_ADDRESS_WIDTH_BITS 64 #define PHYSICAL_ADDRESS_WIDTH_BITS 56 #define PAGE_ATTR_NEXT_LEVEL (0) #define PAGE_ATTR_RWX (PTE_X | PTE_W | PTE_R) #define PAGE_ATTR_READONLY (PTE_R) #define PAGE_ATTR_XN (PTE_W | PTE_R) #define PAGE_ATTR_READEXECUTE (PTE_X | PTE_R) #define PAGE_ATTR_USER (PTE_U) #define PAGE_ATTR_SYSTEM (0) #define PAGE_ATTR_CB (PTE_BUF | PTE_CACHE) #define PAGE_ATTR_DEV (PTE_SO) #define PAGE_DEFAULT_ATTR_LEAF (PTE_SHARE | PTE_BUF | PTE_CACHE | PTE_A | PTE_D | PTE_U | PAGE_ATTR_RWX | PTE_V) #define PAGE_DEFAULT_ATTR_NEXT (PTE_SHARE | PTE_BUF | PTE_CACHE | PTE_A | PTE_D | PTE_V) #define PAGE_IS_LEAF(pte) __MASKVALUE(pte, PAGE_ATTR_RWX) #define PTE_USED(pte) __MASKVALUE(pte, PTE_V) #define PTE_WRAP(attr) (attr | PTE_A | PTE_D) /** * encoding of SATP (Supervisor Address Translation and Protection register) */ #define SATP_MODE_OFFSET 60 #define SATP_MODE_BARE 0 #define SATP_MODE_SV39 8 #define SATP_MODE_SV48 9 #define SATP_MODE_SV57 10 #define SATP_MODE_SV64 11 #define PPN_BITS 44 #define ARCH_VADDR_WIDTH 39 #define SATP_MODE SATP_MODE_SV39 #define MMU_MAP_K_DEVICE PTE_WRAP(PAGE_ATTR_DEV | PTE_G | PAGE_ATTR_XN | PTE_V) #define MMU_MAP_K_RWCB PTE_WRAP(PAGE_ATTR_CB | PTE_G | PAGE_ATTR_RWX | PTE_V) #define MMU_MAP_K_RW PTE_WRAP(PTE_G | PAGE_ATTR_RWX | PTE_V) #define MMU_MAP_U_RWCB PTE_WRAP(PAGE_ATTR_CB | PTE_U | PAGE_ATTR_RWX | PTE_V) #define MMU_MAP_U_ROCB PTE_WRAP(PAGE_ATTR_CB | PTE_U | PAGE_ATTR_READONLY | PTE_V) #define MMU_MAP_U_RWCB_XN PTE_WRAP(PAGE_ATTR_CB | PTE_U | PAGE_ATTR_XN | PTE_V) #define MMU_MAP_U_RW PTE_WRAP(PTE_U | PAGE_ATTR_RWX | PTE_V) #define MMU_MAP_TRACE(attr) (attr) #define PTE_XWR_MASK 0xe #define ARCH_PAGE_SIZE PAGE_SIZE #define ARCH_PAGE_MASK (ARCH_PAGE_SIZE - 1) #define ARCH_PAGE_SHIFT PAGE_OFFSET_BIT #define ARCH_INDEX_WIDTH 9 #define ARCH_INDEX_SIZE (1ul << ARCH_INDEX_WIDTH) #define ARCH_INDEX_MASK (ARCH_INDEX_SIZE - 1) #define ARCH_MAP_FAILED ((void *)0x8000000000000000) void mmu_set_pagetable(rt_ubase_t addr); void mmu_enable_user_page_access(); void mmu_disable_user_page_access(); #define RT_HW_MMU_PROT_READ 1 #define RT_HW_MMU_PROT_WRITE 2 #define RT_HW_MMU_PROT_EXECUTE 4 #define RT_HW_MMU_PROT_KERNEL 8 #define RT_HW_MMU_PROT_USER 16 #define RT_HW_MMU_PROT_CACHE 32 /** * @brief Remove permission from attribution * * @param attr architecture specified mmu attribution * @param prot protect that will be removed * @return size_t returned attribution */ rt_inline size_t rt_hw_mmu_attr_rm_perm(size_t attr, rt_base_t prot) { switch (prot) { /* remove write permission for user */ case RT_HW_MMU_PROT_WRITE | RT_HW_MMU_PROT_USER: default: RT_ASSERT(0); } return attr; } /** * @brief Add permission from attribution * * @param attr architecture specified mmu attribution * @param prot protect that will be added * @return size_t returned attribution */ rt_inline size_t rt_hw_mmu_attr_add_perm(size_t attr, rt_base_t prot) { switch (prot) { /* add write permission for user */ case RT_HW_MMU_PROT_WRITE | RT_HW_MMU_PROT_USER: default: RT_ASSERT(0); } return attr; } /** * @brief Test permission from attribution * * @param attr architecture specified mmu attribution * @param prot protect that will be test * @return rt_bool_t RT_TRUE if the prot is allowed, otherwise RT_FALSE */ rt_inline rt_bool_t rt_hw_mmu_attr_test_perm(size_t attr, rt_base_t prot) { rt_bool_t rc = 0; switch (prot) { /* test write permission for user */ case RT_HW_MMU_PROT_WRITE | RT_HW_MMU_PROT_USER: default: RT_ASSERT(0); } return rc; } #endif