68 lines
2.7 KiB
C
68 lines
2.7 KiB
C
#ifndef _S_VMM_H_
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#define _S_VMM_H_
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#include "g_abi.h"
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#include "g_type.h"
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#include "s_pmm.h"
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typedef uint64_t virtual_addr_t;
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typedef physical_addr_t address_space_t;
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#define K_BASE_VADDR 0xFFFF800000000000
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#define K_END_VADDR 0xFFFFFFFFFFFFFFFF
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//U_BASE = 1MB
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#define U_BASE_VADDR 0x0000000000100000
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#define U_END_BADDR 0x7FFFFFFFFFFFFFFF
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//
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// all the address spaces passed by the kernel would be initialized by k_create_address_space
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// which means the kernel area/ as well as the HAL reserved vaddr ranges would be properly mapped
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//
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typedef physical_addr_t (KABI *page_alloc_func_t)();
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typedef void (KABI *page_free_func_t)(physical_addr_t page);
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#define K_PAGE_ATTR_KERNEL (1 << 2)
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#define K_PAGE_ATTR_CACHED (1 << 3)
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#define K_PAGE_ATTR_NOT_EXECUTABLE (1 << 63)
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#define K_PAGE_ATTR_WRITABLE (1 << 1)
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// this function should map the v_addr to p_addr for the target address space
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extern void KABI ke_map_virtual_addr(physical_addr_t addr_space,
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virtual_addr_t v_addr,
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physical_addr_t p_addr,
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uint64_t attribute,
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page_alloc_func_t alloc);
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typedef struct
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{
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// the kernel always reserves this much virtual space for HAL
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// this is mainly used for recursive page tables or other HAL actions
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virtual_addr_t reserved_vaddr_base;
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virtual_addr_t reserved_vaddr_end;
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// the k_vaddr_alignment determines the alignment of the kernel's address space
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// the reserved virtual address spaces above is also subject to the alignment
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uint64_t k_vaddr_alignment;
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} k_hal_vmm_info;
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// this function always returns the physical address of the new address space
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// the function should identity refer to the virtual address K_BASE_VADDR to K_END_VADDR according to the current address space
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// so that these pages are global (modifying the mapping in this area affects everyone)
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// the K_BASE_VADDR to K_END_VADDR includes the reserved virtual addr space by the HAL
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// if HAL's reserved virtual addr will be mapped to different physical pages, the HAL should make the change
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address_space_t KABI ke_create_address_space(address_space_t address_space,
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page_alloc_func_t alloc);
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// this function destroys the target address space without destroying the K_BASE_VADDR to K_END_VADDR
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// target_addr_space is guaranteed to be not the same as the current address space
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// when the function returns, the current address space must stay unchanged
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void KABI ke_destroy_address_space(address_space_t address_space,
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page_free_func_t free);
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// as the name implies
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void KABI ke_switch_address_space(address_space_t target_addr_space);
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#endif |