acadia/zion/memory/user_stack_manager.cpp

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#include "memory/user_stack_manager.h"
#include "debug/debug.h"
#include "memory/paging_util.h"
uint64_t UserStackManager::NewUserStack() {
uint64_t stack = next_stack_;
next_stack_ -= kStackSize;
if (stack <= kStackMin) {
panic("Out of user stacks!");
}
if (stack == kStackMax) {
// Add a additional page boudary between kernel and user space.
stack -= 0x1000;
}
EnsureResident(stack - 1, 1);
return stack;
}
void UserStackManager::FreeUserStack(uint64_t stack_ptr) {
freed_stacks_++;
dbgln("%u freed user stacks", freed_stacks_);
}