34 lines
814 B
C++
34 lines
814 B
C++
#pragma once
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#include <stdint.h>
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// Per-process class to manage user stacks.
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//
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// User stacks live at
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// 0x00007FF0 00000000 - 0x00007FFF FFFFFFFF
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// and grow downwards.
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//
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// Each user stack gets 1 MiB (0x100000 bytes)
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// less a page boundary.
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// with 1 page allocated at a time.
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// TODO: consider increasing this.
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class UserStackManager {
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public:
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UserStackManager() {}
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UserStackManager(const UserStackManager&) = delete;
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uint64_t NewUserStack();
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void FreeUserStack(uint64_t stack_ptr);
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// Used to check if we should page in this address.
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bool IsValidStack(uint64_t vaddr);
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private:
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const uint64_t kStackMax = 0x00008000'00000000;
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const uint64_t kStackMin = 0x00007FF0'00000000;
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const uint64_t kStackSize = 0x100000;
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uint64_t next_stack_ = kStackMax;
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uint64_t freed_stacks_ = 0;
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};
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