35 lines
833 B
C++
35 lines
833 B
C++
#include "memory/user_stack_manager.h"
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#include "debug/debug.h"
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#include "memory/paging_util.h"
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uint64_t UserStackManager::NewUserStack() {
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uint64_t stack = next_stack_;
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next_stack_ -= kStackSize;
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if (stack <= kStackMin) {
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panic("Out of user stacks!");
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}
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if (stack == kStackMax) {
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// Add a additional page boudary between kernel and user space.
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stack -= 0x1000;
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}
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EnsureResident(stack - 1, 1);
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return stack;
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}
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void UserStackManager::FreeUserStack(uint64_t stack_ptr) {
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freed_stacks_++;
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dbgln("%u freed user stacks", freed_stacks_);
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}
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bool UserStackManager::IsValidStack(uint64_t vaddr) {
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if (vaddr < next_stack_ || vaddr > (kStackMax - 0x1000)) {
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return false;
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}
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// Checks if the address is in the first page of the stack.
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if (vaddr & 0xFF000) {
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return true;
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}
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return false;
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}
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