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Kernel: Introduce threads, and refactor everything in support of it.

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The scheduler now operates on threads, rather than on processes.
Each process has a main thread, and can have any number of additional
threads. The process exits when the main thread exits.

This patch doesn't actually spawn any additional threads, it merely
does all the plumbing needed to make it possible. :^)
This commit is contained in:
Andreas Kling
2019-03-23 22:03:17 +01:00
parent b0de6aa8d8
commit 60d25f0f4a
32 changed files with 1356 additions and 1098 deletions
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48
Kernel/MemoryManager.cpp
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@@ -36,6 +36,8 @@ MemoryManager::MemoryManager()
m_page_table_zero = (dword*)0x6000;
initialize_paging();
kprintf("MM initialized.\n");
}
MemoryManager::~MemoryManager()
@@ -109,6 +111,10 @@ void MemoryManager::initialize_paging()
"orl $0x80000001, %%eax\n"
"movl %%eax, %%cr0\n"
:::"%eax", "memory");
#ifdef MM_DEBUG
dbgprintf("MM: Paging initialized.\n");
#endif
}
RetainPtr<PhysicalPage> MemoryManager::allocate_page_table(PageDirectory& page_directory, unsigned index)
@@ -362,11 +368,12 @@ bool MemoryManager::page_in_from_inode(Region& region, unsigned page_index_in_re
PageFaultResponse MemoryManager::handle_page_fault(const PageFault& fault)
{
ASSERT_INTERRUPTS_DISABLED();
ASSERT(current);
#ifdef PAGE_FAULT_DEBUG
dbgprintf("MM: handle_page_fault(%w) at L%x\n", fault.code(), fault.laddr().get());
#endif
ASSERT(fault.laddr() != m_quickmap_addr);
auto* region = region_from_laddr(*current, fault.laddr());
auto* region = region_from_laddr(current->process(), fault.laddr());
if (!region) {
kprintf("NP(error) fault at invalid address L%x\n", fault.laddr().get());
return PageFaultResponse::ShouldCrash;
@@ -441,8 +448,9 @@ RetainPtr<PhysicalPage> MemoryManager::allocate_supervisor_physical_page()
void MemoryManager::enter_process_paging_scope(Process& process)
{
ASSERT(current);
InterruptDisabler disabler;
current->m_tss.cr3 = process.page_directory().cr3();
current->tss().cr3 = process.page_directory().cr3();
asm volatile("movl %%eax, %%cr3"::"a"(process.page_directory().cr3()):"memory");
}
@@ -620,9 +628,10 @@ bool MemoryManager::validate_user_write(const Process& process, LinearAddress la
Retained<Region> Region::clone()
{
ASSERT(current);
if (m_shared || (m_readable && !m_writable)) {
dbgprintf("%s<%u> Region::clone(): sharing %s (L%x)\n",
current->name().characters(),
current->process().name().characters(),
current->pid(),
m_name.characters(),
laddr().get());
@@ -631,14 +640,14 @@ Retained<Region> Region::clone()
}
dbgprintf("%s<%u> Region::clone(): cowing %s (L%x)\n",
current->name().characters(),
current->process().name().characters(),
current->pid(),
m_name.characters(),
laddr().get());
// Set up a COW region. The parent (this) region becomes COW as well!
for (size_t i = 0; i < page_count(); ++i)
m_cow_map.set(i, true);
MM.remap_region(current->page_directory(), *this);
MM.remap_region(current->process().page_directory(), *this);
return adopt(*new Region(laddr(), size(), m_vmo->clone(), m_offset_in_vmo, String(m_name), m_readable, m_writable, true));
}
@@ -966,6 +975,33 @@ PageDirectory::~PageDirectory()
void PageDirectory::flush(LinearAddress laddr)
{
if (&current->page_directory() == this)
#ifdef MM_DEBUG
dbgprintf("MM: Flush page L%x\n", laddr.get());
#endif
if (!current)
return;
if (&current->process().page_directory() == this)
MM.flush_tlb(laddr);
}
ProcessPagingScope::ProcessPagingScope(Process& process)
{
ASSERT(current);
MM.enter_process_paging_scope(process);
}
ProcessPagingScope::~ProcessPagingScope()
{
MM.enter_process_paging_scope(current->process());
}
KernelPagingScope::KernelPagingScope()
{
ASSERT(current);
MM.enter_kernel_paging_scope();
}
KernelPagingScope::~KernelPagingScope()
{
MM.enter_process_paging_scope(current->process());
}