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Merge remote-tracking branch 'Kernel/mb2_32_64_test' into Kernel-mb2_32_64_test

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EnderIce2
2024-11-20 05:15:06 +02:00
parent 47cf2c24d1
commit b348932172
353 changed files with 77068 additions and 0 deletions
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110
Kernel/Core/Memory/StackGuard.cpp Normal file
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/*
This file is part of Fennix Kernel.
Fennix Kernel is free software: you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.
Fennix Kernel is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
#include <memory.hpp>
#include <debug.h>
namespace Memory
{
StackGuard::StackGuard(bool User, PageTable4 *Table)
{
this->UserMode = User;
this->Table = Table;
if (this->UserMode)
{
void *AllocatedStack = KernelAllocator.RequestPages(TO_PAGES(USER_STACK_SIZE + 1));
memset(AllocatedStack, 0, USER_STACK_SIZE);
debug("AllocatedStack: %p", AllocatedStack);
Virtual va = Virtual(Table);
for (size_t i = 0; i < TO_PAGES(USER_STACK_SIZE); i++)
{
va.Map((void *)(USER_STACK_BASE + (i * PAGE_SIZE)),
(void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)),
PTFlag::RW | PTFlag::US);
debug("Mapped %p to %p", (void *)(USER_STACK_BASE + (i * PAGE_SIZE)),
(void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)));
}
this->StackBottom = (void *)USER_STACK_BASE;
this->StackTop = (void *)(USER_STACK_BASE + USER_STACK_SIZE);
this->StackPhyiscalBottom = AllocatedStack;
this->StackPhyiscalTop = (void *)((uintptr_t)AllocatedStack + USER_STACK_SIZE);
this->Size = USER_STACK_SIZE;
}
else
{
this->StackBottom = KernelAllocator.RequestPages(TO_PAGES(STACK_SIZE + 1));
memset(this->StackBottom, 0, STACK_SIZE);
debug("StackBottom: %p", this->StackBottom);
this->StackTop = (void *)((uintptr_t)this->StackBottom + STACK_SIZE);
this->StackPhyiscalBottom = this->StackBottom;
this->StackPhyiscalTop = this->StackTop;
this->Size = STACK_SIZE;
}
debug("Allocated stack at %p", this->StackBottom);
}
StackGuard::~StackGuard()
{
fixme("Temporarily disabled stack guard deallocation");
// KernelAllocator.FreePages(this->StackBottom, TO_PAGES(this->Size + 1));
// debug("Freed stack at %p", this->StackBottom);
}
bool StackGuard::Expand(uintptr_t FaultAddress)
{
if (this->UserMode)
{
if (FaultAddress < (uintptr_t)this->StackBottom - USER_STACK_SIZE ||
FaultAddress > (uintptr_t)this->StackTop)
{
return false; /* It's not about the stack. */
}
else
{
void *AllocatedStack = KernelAllocator.RequestPages(TO_PAGES(USER_STACK_SIZE + 1));
debug("AllocatedStack: %p", AllocatedStack);
memset(AllocatedStack, 0, USER_STACK_SIZE);
Virtual va = Virtual(this->Table);
for (uintptr_t i = 0; i < TO_PAGES(USER_STACK_SIZE); i++)
{
va.Map((void *)((uintptr_t)this->StackBottom - (i * PAGE_SIZE)), (void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)), PTFlag::RW | PTFlag::US);
debug("Mapped %p to %p", (void *)((uintptr_t)this->StackBottom - (i * PAGE_SIZE)), (void *)((uintptr_t)AllocatedStack + (i * PAGE_SIZE)));
}
this->StackBottom = (void *)((uintptr_t)this->StackBottom - USER_STACK_SIZE);
this->Size += USER_STACK_SIZE;
info("Stack expanded to %p", this->StackBottom);
return true;
}
}
else
{
fixme("Not implemented and probably not needed");
return false;
}
}
}