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Add ability to switch video modes from the system menu.

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I had to change PhysicalPage around a bit for this. Physical pages can now
be instantiated for any arbitrary physical address without worrying that
such pages end up in the kernel page allocator when released.

Most of the pieces were already in place, I just glued everything together.
This commit is contained in:
Andreas Kling
2019-02-17 13:12:59 +01:00
parent 8321908abe
commit 0730b3c15f
7 changed files with 91 additions and 26 deletions
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27
Kernel/MemoryManager.cpp
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@@ -42,7 +42,7 @@ MemoryManager::~MemoryManager()
PageDirectory::PageDirectory(PhysicalAddress paddr)
{
m_directory_page = adopt(*new PhysicalPage(paddr, true));
m_directory_page = PhysicalPage::create_eternal(paddr, true);
}
PageDirectory::PageDirectory()
@@ -87,11 +87,11 @@ void MemoryManager::initialize_paging()
// 3 MB -> 4 MB Supervisor physical pages (available for allocation!)
// 4 MB -> (max) MB Userspace physical pages (available for allocation!)
for (size_t i = (2 * MB); i < (4 * MB); i += PAGE_SIZE)
m_free_supervisor_physical_pages.append(adopt(*new PhysicalPage(PhysicalAddress(i), true)));
m_free_supervisor_physical_pages.append(PhysicalPage::create_eternal(PhysicalAddress(i), true));
dbgprintf("MM: 4MB-%uMB available for allocation\n", m_ram_size / 1048576);
for (size_t i = (4 * MB); i < m_ram_size; i += PAGE_SIZE)
m_free_physical_pages.append(adopt(*new PhysicalPage(PhysicalAddress(i), false)));
m_free_physical_pages.append(PhysicalPage::create_eternal(PhysicalAddress(i), false));
m_quickmap_addr = LinearAddress((1 * MB) - PAGE_SIZE);
#ifdef MM_DEBUG
dbgprintf("MM: Quickmap will use P%x\n", m_quickmap_addr.get());
@@ -650,8 +650,23 @@ Region::~Region()
MM.unregister_region(*this);
}
PhysicalPage::PhysicalPage(PhysicalAddress paddr, bool supervisor)
: m_supervisor(supervisor)
RetainPtr<PhysicalPage> PhysicalPage::create_eternal(PhysicalAddress paddr, bool supervisor)
{
void* slot = kmalloc_eternal(sizeof(PhysicalPage));
new (slot) PhysicalPage(paddr, supervisor);
return adopt(*(PhysicalPage*)slot);
}
RetainPtr<PhysicalPage> PhysicalPage::create(PhysicalAddress paddr, bool supervisor)
{
void* slot = kmalloc(sizeof(PhysicalPage));
new (slot) PhysicalPage(paddr, supervisor, false);
return adopt(*(PhysicalPage*)slot);
}
PhysicalPage::PhysicalPage(PhysicalAddress paddr, bool supervisor, bool may_return_to_freelist)
: m_may_return_to_freelist(may_return_to_freelist)
, m_supervisor(supervisor)
, m_paddr(paddr)
{
}
@@ -724,7 +739,7 @@ VMObject::VMObject(PhysicalAddress paddr, size_t size)
{
MM.register_vmo(*this);
for (size_t i = 0; i < size; i += PAGE_SIZE) {
m_physical_pages.append(adopt(*new PhysicalPage(paddr.offset(i), false)));
m_physical_pages.append(PhysicalPage::create(paddr.offset(i), false));
}
ASSERT(m_physical_pages.size() == page_count());
}