36 lines
No EOL
1 KiB
C
36 lines
No EOL
1 KiB
C
#pragma once
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#include "memory/pointer.h"
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#include "util/optional.h"
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struct PageTable {
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struct flags_t {
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enum class granularity_t : uint8_t {
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page_4KiB,
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page_2MiB,
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page_1GiB,
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};
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bool writeable : 1; // allow writes
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bool user_accessible : 1; // allow ring-3 access
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bool write_through : 1; // write-through instead of write-back
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bool cache_disabled : 1; // uncached (MMIO)
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bool execute_disabled : 1; // forbid instruction fetch
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bool global : 1; // keep in TLB across CR3 switches
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granularity_t granularity : 2; // mapping size
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};
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struct info_t {
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flags_t flags;
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paddr_t address;
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};
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static PageTable fromCurrent();
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static optional<PageTable> allocNew();
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void activate();
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bool map(void* vaddress, paddr_t paddress, flags_t flags);
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void unmap(void* vaddress);
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optional<info_t> get(void* vaddress);
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paddr_t l4;
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}; |