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[Zion] Add released User Stacks to pool for reuse.

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This commit is contained in:
Drew Galbraith 2023-11-24 16:16:25 -08:00
parent d1ace374b6
commit 7695396980
3 changed files with 19 additions and 11 deletions
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15
zion/memory/user_stack_manager.cpp
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@ -4,12 +4,16 @@
#include "memory/paging_util.h"
uint64_t UserStackManager::NewUserStack() {
if (!freed_stacks_.empty()) {
return freed_stacks_.PopFront();
}
uint64_t stack = next_stack_;
next_stack_ -= kStackSize;
if (stack <= kStackMin) {
next_stack_ -= kUserStackSize;
if (stack <= kUserStackMin) {
panic("Out of user stacks!");
}
if (stack == kStackMax) {
if (stack == kUserStackMax) {
// Add a additional page boudary between kernel and user space.
stack -= 0x1000;
}
@ -18,12 +22,11 @@ uint64_t UserStackManager::NewUserStack() {
}
void UserStackManager::FreeUserStack(uint64_t stack_ptr) {
freed_stacks_++;
dbgln("{} freed user stacks", freed_stacks_);
freed_stacks_.PushBack(stack_ptr);
}
bool UserStackManager::IsValidStack(uint64_t vaddr) {
if (vaddr < next_stack_ || vaddr > (kStackMax - 0x1000)) {
if (vaddr < next_stack_ || vaddr > (kUserStackMax - 0x1000)) {
return false;
}
// Checks if the address is in the first page of the stack.