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Process now maps regions immediately when they are allocated.

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This avoids having to do a separate MM.mapRegionsForTask() pass.

Also, more Task => Process renaming that I apparently hadn't saved yet.
This commit is contained in:
Andreas Kling 2018-11-01 13:15:46 +01:00
parent 4e60551aec
commit 3e532ac7b6
Notes: sideshowbarker 2024-07-19 18:34:59 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/3e532ac7b6f
14 changed files with 327 additions and 387 deletions
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4
Kernel/Disk.cpp
View file

@ -1,5 +1,5 @@
#include "types.h"
#include "Task.h"
#include "Process.h"
#include "VGA.h"
#include "Disk.h"
#include "kmalloc.h"
@ -145,8 +145,6 @@ bool readSectors(DWORD startSector, WORD count, BYTE* outbuf)
count,
startSector);
#endif
Task::checkSanity("Disk::readSectors");
disableIRQ();
CHS chs = lba2chs(IDE0_DISK0, startSector);

2
Kernel/Makefile
View file

@ -5,7 +5,7 @@ KERNEL_OBJS = \
kmalloc.o \
StdLib.o \
i386.o \
Task.o \
Process.o \
i8253.o \
Keyboard.o \
CMOS.o \

64
Kernel/MemoryManager.cpp
View file

@ -4,7 +4,7 @@
#include <AK/kmalloc.h>
#include "i386.h"
#include "StdLib.h"
#include "Task.h"
#include "Process.h"
//#define MM_DEBUG
@ -30,12 +30,12 @@ MemoryManager::~MemoryManager()
{
}
void MemoryManager::populate_page_directory(Task& task)
void MemoryManager::populate_page_directory(Process& process)
{
memset(task.m_pageDirectory, 0, 4096);
memset(process.m_pageDirectory, 0, 4096);
task.m_pageDirectory[0] = m_kernel_page_directory[0];
task.m_pageDirectory[1] = m_kernel_page_directory[1];
process.m_pageDirectory[0] = m_kernel_page_directory[0];
process.m_pageDirectory[1] = m_kernel_page_directory[1];
}
void MemoryManager::initializePaging()
@ -214,11 +214,11 @@ void MemoryManager::enter_kernel_paging_scope()
asm volatile("movl %%eax, %%cr3"::"a"(m_kernel_page_directory));
}
void MemoryManager::enter_task_paging_scope(Task& task)
void MemoryManager::enter_process_paging_scope(Process& process)
{
InterruptDisabler disabler;
current->m_tss.cr3 = (dword)task.m_pageDirectory;
asm volatile("movl %%eax, %%cr3"::"a"(task.m_pageDirectory));
current->m_tss.cr3 = (dword)process.m_pageDirectory;
asm volatile("movl %%eax, %%cr3"::"a"(process.m_pageDirectory));
}
void MemoryManager::flushEntireTLB()
@ -234,7 +234,7 @@ void MemoryManager::flushTLB(LinearAddress laddr)
asm volatile("invlpg %0": :"m" (*(char*)laddr.get()));
}
void MemoryManager::map_region_at_address(dword* page_directory, Task::Region& region, LinearAddress laddr)
void MemoryManager::map_region_at_address(dword* page_directory, Process::Region& region, LinearAddress laddr, bool user_allowed)
{
InterruptDisabler disabler;
auto& zone = *region.zone;
@ -244,7 +244,7 @@ void MemoryManager::map_region_at_address(dword* page_directory, Task::Region& r
pte.setPhysicalPageBase(zone.m_pages[i].get());
pte.setPresent(true);
pte.setWritable(true);
pte.setUserAllowed(true);
pte.setUserAllowed(user_allowed);
flushTLB(page_laddr);
#ifdef MM_DEBUG
dbgprintf("MM: >> map_region_at_address (PD=%x) L%x => P%x\n", page_directory, page_laddr, zone.m_pages[i].get());
@ -282,26 +282,26 @@ LinearAddress MemoryManager::allocate_linear_address_range(size_t size)
return laddr;
}
byte* MemoryManager::create_kernel_alias_for_region(Task::Region& region)
byte* MemoryManager::create_kernel_alias_for_region(Process::Region& region)
{
InterruptDisabler disabler;
auto laddr = allocate_linear_address_range(region.size);
map_region_at_address(m_kernel_page_directory, region, laddr);
map_region_at_address(m_kernel_page_directory, region, laddr, false);
return laddr.asPtr();
}
void MemoryManager::remove_kernel_alias_for_region(Task::Region& region, byte* addr)
void MemoryManager::remove_kernel_alias_for_region(Process::Region& region, byte* addr)
{
unmap_range(m_kernel_page_directory, LinearAddress((dword)addr), region.size);
}
bool MemoryManager::unmapRegion(Task& task, Task::Region& region)
bool MemoryManager::unmapRegion(Process& process, Process::Region& region)
{
InterruptDisabler disabler;
auto& zone = *region.zone;
for (size_t i = 0; i < zone.m_pages.size(); ++i) {
auto laddr = region.linearAddress.offset(i * PAGE_SIZE);
auto pte = ensurePTE(task.m_pageDirectory, laddr);
auto pte = ensurePTE(process.m_pageDirectory, laddr);
pte.setPhysicalPageBase(0);
pte.setPresent(false);
pte.setWritable(false);
@ -314,14 +314,14 @@ bool MemoryManager::unmapRegion(Task& task, Task::Region& region)
return true;
}
bool MemoryManager::unmapSubregion(Task& task, Task::Subregion& subregion)
bool MemoryManager::unmapSubregion(Process& process, Process::Subregion& subregion)
{
InterruptDisabler disabler;
size_t numPages = subregion.size / 4096;
ASSERT(numPages);
for (size_t i = 0; i < numPages; ++i) {
auto laddr = subregion.linearAddress.offset(i * PAGE_SIZE);
auto pte = ensurePTE(task.m_pageDirectory, laddr);
auto pte = ensurePTE(process.m_pageDirectory, laddr);
pte.setPhysicalPageBase(0);
pte.setPresent(false);
pte.setWritable(false);
@ -334,7 +334,7 @@ bool MemoryManager::unmapSubregion(Task& task, Task::Subregion& subregion)
return true;
}
bool MemoryManager::mapSubregion(Task& task, Task::Subregion& subregion)
bool MemoryManager::mapSubregion(Process& process, Process::Subregion& subregion)
{
InterruptDisabler disabler;
auto& region = *subregion.region;
@ -344,7 +344,7 @@ bool MemoryManager::mapSubregion(Task& task, Task::Subregion& subregion)
ASSERT(numPages);
for (size_t i = 0; i < numPages; ++i) {
auto laddr = subregion.linearAddress.offset(i * PAGE_SIZE);
auto pte = ensurePTE(task.m_pageDirectory, laddr);
auto pte = ensurePTE(process.m_pageDirectory, laddr);
pte.setPhysicalPageBase(zone.m_pages[firstPage + i].get());
pte.setPresent(true);
pte.setWritable(true);
@ -357,17 +357,17 @@ bool MemoryManager::mapSubregion(Task& task, Task::Subregion& subregion)
return true;
}
bool MemoryManager::mapRegion(Task& task, Task::Region& region)
bool MemoryManager::mapRegion(Process& process, Process::Region& region)
{
map_region_at_address(task.m_pageDirectory, region, region.linearAddress);
map_region_at_address(process.m_pageDirectory, region, region.linearAddress, true);
return true;
}
bool MemoryManager::validate_user_read(const Task& task, LinearAddress laddr) const
bool MemoryManager::validate_user_read(const Process& process, LinearAddress laddr) const
{
dword pageDirectoryIndex = (laddr.get() >> 22) & 0x3ff;
dword pageTableIndex = (laddr.get() >> 12) & 0x3ff;
auto pde = PageDirectoryEntry(&task.m_pageDirectory[pageDirectoryIndex]);
auto pde = PageDirectoryEntry(&process.m_pageDirectory[pageDirectoryIndex]);
if (!pde.isPresent())
return false;
auto pte = PageTableEntry(&pde.pageTableBase()[pageTableIndex]);
@ -378,11 +378,11 @@ bool MemoryManager::validate_user_read(const Task& task, LinearAddress laddr) co
return true;
}
bool MemoryManager::validate_user_write(const Task& task, LinearAddress laddr) const
bool MemoryManager::validate_user_write(const Process& process, LinearAddress laddr) const
{
dword pageDirectoryIndex = (laddr.get() >> 22) & 0x3ff;
dword pageTableIndex = (laddr.get() >> 12) & 0x3ff;
auto pde = PageDirectoryEntry(&task.m_pageDirectory[pageDirectoryIndex]);
auto pde = PageDirectoryEntry(&process.m_pageDirectory[pageDirectoryIndex]);
if (!pde.isPresent())
return false;
auto pte = PageTableEntry(&pde.pageTableBase()[pageTableIndex]);
@ -394,17 +394,3 @@ bool MemoryManager::validate_user_write(const Task& task, LinearAddress laddr) c
return false;
return true;
}
bool MemoryManager::mapRegionsForTask(Task& task)
{
ASSERT_INTERRUPTS_DISABLED();
for (auto& region : task.m_regions) {
if (!mapRegion(task, *region))
return false;
}
for (auto& subregion : task.m_subregions) {
if (!mapSubregion(task, *subregion))
return false;
}
return true;
}

35
Kernel/MemoryManager.h
View file

@ -6,9 +6,9 @@
#include <AK/RetainPtr.h>
#include <AK/Vector.h>
#include <AK/HashTable.h>
#include "Task.h"
#include "Process.h"
class Task;
class Process;
enum class PageFaultResponse {
ShouldCrash,
@ -46,33 +46,32 @@ public:
RetainPtr<Zone> createZone(size_t);
bool mapSubregion(Task&, Task::Subregion&);
bool unmapSubregion(Task&, Task::Subregion&);
bool mapSubregion(Process&, Process::Subregion&);
bool unmapSubregion(Process&, Process::Subregion&);
bool mapRegion(Task&, Task::Region&);
bool unmapRegion(Task&, Task::Region&);
bool mapRegionsForTask(Task&);
bool mapRegion(Process&, Process::Region&);
bool unmapRegion(Process&, Process::Region&);
void registerZone(Zone&);
void unregisterZone(Zone&);
void populate_page_directory(Task&);
void populate_page_directory(Process&);
byte* create_kernel_alias_for_region(Task::Region&);
void remove_kernel_alias_for_region(Task::Region&, byte*);
byte* create_kernel_alias_for_region(Process::Region&);
void remove_kernel_alias_for_region(Process::Region&, byte*);
void enter_kernel_paging_scope();
void enter_task_paging_scope(Task&);
void enter_process_paging_scope(Process&);
bool validate_user_read(const Task&, LinearAddress) const;
bool validate_user_write(const Task&, LinearAddress) const;
bool validate_user_read(const Process&, LinearAddress) const;
bool validate_user_write(const Process&, LinearAddress) const;
private:
MemoryManager();
~MemoryManager();
LinearAddress allocate_linear_address_range(size_t);
void map_region_at_address(dword* page_directory, Task::Region&, LinearAddress);
void map_region_at_address(dword* page_directory, Process::Region&, LinearAddress, bool user_accessible);
void unmap_range(dword* page_directory, LinearAddress, size_t);
void initializePaging();
@ -179,10 +178,10 @@ private:
struct KernelPagingScope {
KernelPagingScope() { MM.enter_kernel_paging_scope(); }
~KernelPagingScope() { MM.enter_task_paging_scope(*current); }
~KernelPagingScope() { MM.enter_process_paging_scope(*current); }
};
struct OtherTaskPagingScope {
OtherTaskPagingScope(Task& task) { MM.enter_task_paging_scope(task); }
~OtherTaskPagingScope() { MM.enter_task_paging_scope(*current); }
struct OtherProcessPagingScope {
OtherProcessPagingScope(Process& process) { MM.enter_process_paging_scope(process); }
~OtherProcessPagingScope() { MM.enter_process_paging_scope(*current); }
};

86
Kernel/ProcFileSystem.cpp
View file

@ -1,5 +1,5 @@
#include "ProcFileSystem.h"
#include "Task.h"
#include "Process.h"
#include <VirtualFileSystem/VirtualFileSystem.h>
#include "system.h"
#include "MemoryManager.h"
@ -27,24 +27,24 @@ ProcFileSystem::~ProcFileSystem()
{
}
ByteBuffer procfs$pid_vm(const Task& task)
ByteBuffer procfs$pid_vm(const Process& process)
{
InterruptDisabler disabler;
char* buffer;
auto stringImpl = StringImpl::createUninitialized(80 + task.regionCount() * 80 + 80 + task.subregionCount() * 80, buffer);
auto stringImpl = StringImpl::createUninitialized(80 + process.regionCount() * 80 + 80 + process.subregionCount() * 80, buffer);
memset(buffer, 0, stringImpl->length());
char* ptr = buffer;
ptr += ksprintf(ptr, "BEGIN END SIZE NAME\n");
for (auto& region : task.regions()) {
for (auto& region : process.regions()) {
ptr += ksprintf(ptr, "%x -- %x %x %s\n",
region->linearAddress.get(),
region->linearAddress.offset(region->size - 1).get(),
region->size,
region->name.characters());
}
if (task.subregionCount()) {
if (process.subregionCount()) {
ptr += ksprintf(ptr, "\nREGION OFFSET BEGIN END SIZE NAME\n");
for (auto& subregion : task.subregions()) {
for (auto& subregion : process.subregions()) {
ptr += ksprintf(ptr, "%x %x %x -- %x %x %s\n",
subregion->region->linearAddress.get(),
subregion->offset,
@ -58,18 +58,18 @@ ByteBuffer procfs$pid_vm(const Task& task)
return ByteBuffer::copy((byte*)buffer, ptr - buffer);
}
ByteBuffer procfs$pid_stack(Task& task)
ByteBuffer procfs$pid_stack(Process& process)
{
InterruptDisabler disabler;
OtherTaskPagingScope pagingScope(task);
OtherProcessPagingScope pagingScope(process);
struct RecognizedSymbol {
dword address;
const KSym* ksym;
};
Vector<RecognizedSymbol> recognizedSymbols;
if (auto* eipKsym = ksymbolicate(task.tss().eip))
recognizedSymbols.append({ task.tss().eip, eipKsym });
for (dword* stackPtr = (dword*)task.framePtr(); task.isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
if (auto* eipKsym = ksymbolicate(process.tss().eip))
recognizedSymbols.append({ process.tss().eip, eipKsym });
for (dword* stackPtr = (dword*)process.framePtr(); process.isValidAddressForKernel(LinearAddress((dword)stackPtr)); stackPtr = (dword*)*stackPtr) {
dword retaddr = stackPtr[1];
if (auto* ksym = ksymbolicate(retaddr))
recognizedSymbols.append({ retaddr, ksym });
@ -90,33 +90,33 @@ ByteBuffer procfs$pid_stack(Task& task)
return buffer;
}
ByteBuffer procfs$pid_exe(Task& task)
ByteBuffer procfs$pid_exe(Process& process)
{
InodeIdentifier inode;
{
InterruptDisabler disabler;
inode = task.executableInode();
inode = process.executableInode();
}
return VirtualFileSystem::the().absolutePath(inode).toByteBuffer();
}
void ProcFileSystem::addProcess(Task& task)
void ProcFileSystem::addProcess(Process& process)
{
ASSERT_INTERRUPTS_DISABLED();
char buf[16];
ksprintf(buf, "%d", task.pid());
ksprintf(buf, "%d", process.pid());
auto dir = addFile(createDirectory(buf));
m_pid2inode.set(task.pid(), dir.index());
addFile(createGeneratedFile("vm", [&task] { return procfs$pid_vm(task); }), dir.index());
addFile(createGeneratedFile("stack", [&task] { return procfs$pid_stack(task); }), dir.index());
if (task.executableInode().isValid())
addFile(createGeneratedFile("exe", [&task] { return procfs$pid_exe(task); }, 00120777), dir.index());
m_pid2inode.set(process.pid(), dir.index());
addFile(createGeneratedFile("vm", [&process] { return procfs$pid_vm(process); }), dir.index());
addFile(createGeneratedFile("stack", [&process] { return procfs$pid_stack(process); }), dir.index());
if (process.executableInode().isValid())
addFile(createGeneratedFile("exe", [&process] { return procfs$pid_exe(process); }, 00120777), dir.index());
}
void ProcFileSystem::removeProcess(Task& task)
void ProcFileSystem::removeProcess(Process& process)
{
ASSERT_INTERRUPTS_DISABLED();
auto pid = task.pid();
auto pid = process.pid();
auto it = m_pid2inode.find(pid);
ASSERT(it != m_pid2inode.end());
bool success = removeFile((*it).value);
@ -172,18 +172,18 @@ ByteBuffer procfs$kmalloc()
return buffer;
}
static const char* toString(Task::State state)
static const char* toString(Process::State state)
{
switch (state) {
case Task::Invalid: return "Invalid";
case Task::Runnable: return "Runnable";
case Task::Running: return "Running";
case Task::Terminated: return "Term";
case Task::Crashing: return "Crash";
case Task::Exiting: return "Exit";
case Task::BlockedSleep: return "Sleep";
case Task::BlockedWait: return "Wait";
case Task::BlockedRead: return "Read";
case Process::Invalid: return "Invalid";
case Process::Runnable: return "Runnable";
case Process::Running: return "Running";
case Process::Terminated: return "Term";
case Process::Crashing: return "Crash";
case Process::Exiting: return "Exit";
case Process::BlockedSleep: return "Sleep";
case Process::BlockedWait: return "Wait";
case Process::BlockedRead: return "Read";
}
ASSERT_NOT_REACHED();
return nullptr;
@ -192,20 +192,20 @@ static const char* toString(Task::State state)
ByteBuffer procfs$summary()
{
InterruptDisabler disabler;
auto tasks = Task::allTasks();
auto buffer = ByteBuffer::createUninitialized(tasks.size() * 256);
auto processes = Process::allProcesses();
auto buffer = ByteBuffer::createUninitialized(processes.size() * 256);
char* ptr = (char*)buffer.pointer();
ptr += ksprintf(ptr, "PID OWNER STATE PPID NSCHED FDS TTY NAME\n");
for (auto* task : tasks) {
for (auto* process : processes) {
ptr += ksprintf(ptr, "% 5u % 4u % 8s % 5u % 10u % 3u % 4s %s\n",
task->pid(),
task->uid(),
toString(task->state()),
task->parentPID(),
task->timesScheduled(),
task->fileHandleCount(),
task->tty() ? strrchr(task->tty()->ttyName().characters(), '/') + 1 : "n/a",
task->name().characters());
process->pid(),
process->uid(),
toString(process->state()),
process->parentPID(),
process->timesScheduled(),
process->fileHandleCount(),
process->tty() ? strrchr(process->tty()->ttyName().characters(), '/') + 1 : "n/a",
process->name().characters());
}
*ptr = '\0';
buffer.trim(ptr - (char*)buffer.pointer());

6
Kernel/ProcFileSystem.h
View file

@ -3,7 +3,7 @@
#include <AK/Types.h>
#include <VirtualFileSystem/SyntheticFileSystem.h>
class Task;
class Process;
class ProcFileSystem final : public SyntheticFileSystem {
public:
@ -15,8 +15,8 @@ public:
virtual bool initialize() override;
virtual const char* className() const override;
void addProcess(Task&);
void removeProcess(Task&);
void addProcess(Process&);
void removeProcess(Process&);
private:
ProcFileSystem();

407
Kernel/Process.cpp
View file

@ -1,5 +1,5 @@
#include "types.h"
#include "Task.h"
#include "Process.h"
#include "kmalloc.h"
#include "VGA.h"
#include "StdLib.h"
@ -37,12 +37,12 @@
static const DWORD defaultStackSize = 16384;
Task* current;
Task* s_kernelTask;
Process* current;
Process* s_kernelProcess;
static pid_t next_pid;
static InlineLinkedList<Task>* s_tasks;
static InlineLinkedList<Task>* s_deadTasks;
static InlineLinkedList<Process>* s_processes;
static InlineLinkedList<Process>* s_deadProcesses;
static String* s_hostname;
static String& hostnameStorage(InterruptDisabler&)
@ -57,16 +57,16 @@ static String getHostname()
return hostnameStorage(disabler).isolatedCopy();
}
static bool contextSwitch(Task*);
static bool contextSwitch(Process*);
static void redoKernelTaskTSS()
static void redoKernelProcessTSS()
{
if (!s_kernelTask->selector())
s_kernelTask->setSelector(allocateGDTEntry());
if (!s_kernelProcess->selector())
s_kernelProcess->setSelector(allocateGDTEntry());
auto& tssDescriptor = getGDTEntry(s_kernelTask->selector());
auto& tssDescriptor = getGDTEntry(s_kernelProcess->selector());
tssDescriptor.setBase(&s_kernelTask->tss());
tssDescriptor.setBase(&s_kernelProcess->tss());
tssDescriptor.setLimit(0xffff);
tssDescriptor.dpl = 0;
tssDescriptor.segment_present = 1;
@ -79,40 +79,26 @@ static void redoKernelTaskTSS()
flushGDT();
}
void Task::prepForIRETToNewTask()
void Process::prepForIRETToNewProcess()
{
redoKernelTaskTSS();
s_kernelTask->tss().backlink = current->selector();
loadTaskRegister(s_kernelTask->selector());
redoKernelProcessTSS();
s_kernelProcess->tss().backlink = current->selector();
loadTaskRegister(s_kernelProcess->selector());
}
void Task::initialize()
void Process::initialize()
{
current = nullptr;
next_pid = 0;
s_tasks = new InlineLinkedList<Task>;
s_deadTasks = new InlineLinkedList<Task>;
s_kernelTask = Task::createKernelTask(nullptr, "colonel");
s_processes = new InlineLinkedList<Process>;
s_deadProcesses = new InlineLinkedList<Process>;
s_kernelProcess = Process::createKernelProcess(nullptr, "colonel");
s_hostname = new String("birx");
redoKernelTaskTSS();
loadTaskRegister(s_kernelTask->selector());
redoKernelProcessTSS();
loadTaskRegister(s_kernelProcess->selector());
}
#ifdef TASK_SANITY_CHECKS
void Task::checkSanity(const char* msg)
{
char ch = current->name()[0];
kprintf("<%p> %s{%u}%b [%d] :%b: sanity check <%s>\n",
current->name().characters(),
current->name().characters(),
current->name().length(),
current->name()[current->name().length() - 1],
current->pid(), ch, msg ? msg : "");
ASSERT((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'));
}
#endif
void Task::allocateLDT()
void Process::allocateLDT()
{
ASSERT(!m_tss.ldt);
static const WORD numLDTEntries = 4;
@ -136,17 +122,17 @@ void Task::allocateLDT()
m_tss.ldt = newLDTSelector;
}
Vector<Task*> Task::allTasks()
Vector<Process*> Process::allProcesses()
{
InterruptDisabler disabler;
Vector<Task*> tasks;
tasks.ensureCapacity(s_tasks->sizeSlow());
for (auto* task = s_tasks->head(); task; task = task->next())
tasks.append(task);
return tasks;
Vector<Process*> processes;
processes.ensureCapacity(s_processes->sizeSlow());
for (auto* process = s_processes->head(); process; process = process->next())
processes.append(process);
return processes;
}
Task::Region* Task::allocateRegion(size_t size, String&& name)
Process::Region* Process::allocateRegion(size_t size, String&& name)
{
// FIXME: This needs sanity checks. What if this overlaps existing regions?
@ -154,10 +140,11 @@ Task::Region* Task::allocateRegion(size_t size, String&& name)
ASSERT(zone);
m_regions.append(adopt(*new Region(m_nextRegion, size, move(zone), move(name))));
m_nextRegion = m_nextRegion.offset(size).offset(16384);
MM.mapRegion(*this, *m_regions.last());
return m_regions.last().ptr();
}
bool Task::deallocateRegion(Region& region)
bool Process::deallocateRegion(Region& region)
{
InterruptDisabler disabler;
for (size_t i = 0; i < m_regions.size(); ++i) {
@ -170,7 +157,7 @@ bool Task::deallocateRegion(Region& region)
return false;
}
Task::Region* Task::regionFromRange(LinearAddress laddr, size_t size)
Process::Region* Process::regionFromRange(LinearAddress laddr, size_t size)
{
for (auto& region : m_regions) {
if (region->linearAddress == laddr && region->size == size)
@ -179,7 +166,7 @@ Task::Region* Task::regionFromRange(LinearAddress laddr, size_t size)
return nullptr;
}
int Task::sys$set_mmap_name(void* addr, size_t size, const char* name)
int Process::sys$set_mmap_name(void* addr, size_t size, const char* name)
{
VALIDATE_USER_READ(name, strlen(name));
auto* region = regionFromRange(LinearAddress((dword)addr), size);
@ -189,7 +176,7 @@ int Task::sys$set_mmap_name(void* addr, size_t size, const char* name)
return 0;
}
void* Task::sys$mmap(void* addr, size_t size)
void* Process::sys$mmap(void* addr, size_t size)
{
InterruptDisabler disabler;
// FIXME: Implement mapping at a client-preferred address.
@ -201,7 +188,7 @@ void* Task::sys$mmap(void* addr, size_t size)
return (void*)region->linearAddress.get();
}
int Task::sys$munmap(void* addr, size_t size)
int Process::sys$munmap(void* addr, size_t size)
{
InterruptDisabler disabler;
auto* region = regionFromRange(LinearAddress((dword)addr), size);
@ -212,7 +199,7 @@ int Task::sys$munmap(void* addr, size_t size)
return 0;
}
int Task::sys$gethostname(char* buffer, size_t size)
int Process::sys$gethostname(char* buffer, size_t size)
{
VALIDATE_USER_WRITE(buffer, size);
auto hostname = getHostname();
@ -222,7 +209,7 @@ int Task::sys$gethostname(char* buffer, size_t size)
return 0;
}
int Task::sys$spawn(const char* path, const char** args)
int Process::sys$spawn(const char* path, const char** args)
{
if (args) {
for (size_t i = 0; args[i]; ++i) {
@ -231,13 +218,13 @@ int Task::sys$spawn(const char* path, const char** args)
}
int error = 0;
auto* child = Task::createUserTask(path, m_uid, m_gid, m_pid, error, args, m_tty);
auto* child = Process::createUserProcess(path, m_uid, m_gid, m_pid, error, args, m_tty);
if (child)
return child->pid();
return error;
}
Task* Task::createUserTask(const String& path, uid_t uid, gid_t gid, pid_t parentPID, int& error, const char** args, TTY* tty)
Process* Process::createUserProcess(const String& path, uid_t uid, gid_t gid, pid_t parentPID, int& error, const char** args, TTY* tty)
{
auto parts = path.split('/');
if (parts.isEmpty()) {
@ -248,8 +235,8 @@ Task* Task::createUserTask(const String& path, uid_t uid, gid_t gid, pid_t paren
RetainPtr<VirtualFileSystem::Node> cwd;
{
InterruptDisabler disabler;
if (auto* parentTask = Task::fromPID(parentPID))
cwd = parentTask->m_cwd.copyRef();
if (auto* parentProcess = Process::fromPID(parentPID))
cwd = parentProcess->m_cwd.copyRef();
if (!cwd)
cwd = VirtualFileSystem::the().root();
}
@ -269,27 +256,27 @@ Task* Task::createUserTask(const String& path, uid_t uid, gid_t gid, pid_t paren
return nullptr;
}
Vector<String> taskArguments;
Vector<String> processArguments;
if (args) {
for (size_t i = 0; args[i]; ++i) {
taskArguments.append(args[i]);
processArguments.append(args[i]);
}
} else {
taskArguments.append(parts.last());
processArguments.append(parts.last());
}
Vector<String> taskEnvironment;
taskEnvironment.append("PATH=/bin");
taskEnvironment.append("SHELL=/bin/sh");
taskEnvironment.append("TERM=console");
taskEnvironment.append("HOME=/");
Vector<String> processEnvironment;
processEnvironment.append("PATH=/bin");
processEnvironment.append("SHELL=/bin/sh");
processEnvironment.append("TERM=console");
processEnvironment.append("HOME=/");
InterruptDisabler disabler; // FIXME: Get rid of this, jesus christ. This "critical" section is HUGE.
KernelPagingScope pagingScope;
Task* t = new Task(parts.takeLast(), uid, gid, parentPID, Ring3, move(cwd), handle->vnode(), tty);
Process* t = new Process(parts.takeLast(), uid, gid, parentPID, Ring3, move(cwd), handle->vnode(), tty);
t->m_arguments = move(taskArguments);
t->m_initialEnvironment = move(taskEnvironment);
t->m_arguments = move(processArguments);
t->m_initialEnvironment = move(processEnvironment);
ExecSpace space;
Region* region = nullptr;
@ -343,18 +330,16 @@ Task* Task::createUserTask(const String& path, uid_t uid, gid_t gid, pid_t paren
ASSERT(region);
MM.remove_kernel_alias_for_region(*region, region_alias);
MM.mapRegionsForTask(*t);
s_tasks->prepend(t);
s_processes->prepend(t);
system.nprocess++;
#ifdef TASK_DEBUG
kprintf("Task %u (%s) spawned @ %p\n", t->pid(), t->name().characters(), t->m_tss.eip);
kprintf("Process %u (%s) spawned @ %p\n", t->pid(), t->name().characters(), t->m_tss.eip);
#endif
error = 0;
return t;
}
int Task::sys$get_environment(char*** environ)
int Process::sys$get_environment(char*** environ)
{
auto* region = allocateRegion(4096, "environ");
if (!region)
@ -373,7 +358,7 @@ int Task::sys$get_environment(char*** environ)
return 0;
}
int Task::sys$get_arguments(int* argc, char*** argv)
int Process::sys$get_arguments(int* argc, char*** argv)
{
auto* region = allocateRegion(4096, "argv");
if (!region)
@ -392,24 +377,24 @@ int Task::sys$get_arguments(int* argc, char*** argv)
return 0;
}
Task* Task::createKernelTask(void (*e)(), String&& name)
Process* Process::createKernelProcess(void (*e)(), String&& name)
{
Task* task = new Task(move(name), (uid_t)0, (gid_t)0, (pid_t)0, Ring0);
task->m_tss.eip = (dword)e;
Process* process = new Process(move(name), (uid_t)0, (gid_t)0, (pid_t)0, Ring0);
process->m_tss.eip = (dword)e;
if (task->pid() != 0) {
if (process->pid() != 0) {
InterruptDisabler disabler;
s_tasks->prepend(task);
s_processes->prepend(process);
system.nprocess++;
#ifdef TASK_DEBUG
kprintf("Kernel task %u (%s) spawned @ %p\n", task->pid(), task->name().characters(), task->m_tss.eip);
kprintf("Kernel process %u (%s) spawned @ %p\n", process->pid(), process->name().characters(), process->m_tss.eip);
#endif
}
return task;
return process;
}
Task::Task(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring, RetainPtr<VirtualFileSystem::Node>&& cwd, RetainPtr<VirtualFileSystem::Node>&& executable, TTY* tty)
Process::Process(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring, RetainPtr<VirtualFileSystem::Node>&& cwd, RetainPtr<VirtualFileSystem::Node>&& executable, TTY* tty)
: m_name(move(name))
, m_pid(next_pid++)
, m_uid(uid)
@ -443,7 +428,7 @@ Task::Task(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring,
allocateLDT();
}
// Only IF is set when a task boots.
// Only IF is set when a process boots.
m_tss.eflags = 0x0202;
word cs, ds, ss;
@ -469,7 +454,7 @@ Task::Task(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring,
if (isRing0()) {
// FIXME: This memory is leaked.
// But uh, there's also no kernel task termination, so I guess it's not technically leaked...
// But uh, there's also no kernel process termination, so I guess it's not technically leaked...
dword stackBottom = (dword)kmalloc_eternal(defaultStackSize);
m_stackTop0 = (stackBottom + defaultStackSize) & 0xffffff8;
m_tss.esp = m_stackTop0;
@ -481,7 +466,7 @@ Task::Task(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring,
}
if (isRing3()) {
// Ring3 tasks need a separate stack for Ring0.
// Ring3 processes need a separate stack for Ring0.
m_kernelStack = kmalloc(defaultStackSize);
m_stackTop0 = ((DWORD)m_kernelStack + defaultStackSize) & 0xffffff8;
m_tss.ss0 = 0x10;
@ -495,7 +480,7 @@ Task::Task(String&& name, uid_t uid, gid_t gid, pid_t parentPID, RingLevel ring,
ProcFileSystem::the().addProcess(*this);
}
Task::~Task()
Process::~Process()
{
InterruptDisabler disabler;
ProcFileSystem::the().removeProcess(*this);
@ -509,9 +494,9 @@ Task::~Task()
}
}
void Task::dumpRegions()
void Process::dumpRegions()
{
kprintf("Task %s(%u) regions:\n", name().characters(), pid());
kprintf("Process %s(%u) regions:\n", name().characters(), pid());
kprintf("BEGIN END SIZE NAME\n");
for (auto& region : m_regions) {
kprintf("%x -- %x %x %s\n",
@ -521,7 +506,7 @@ void Task::dumpRegions()
region->name.characters());
}
kprintf("Task %s(%u) subregions:\n", name().characters(), pid());
kprintf("Process %s(%u) subregions:\n", name().characters(), pid());
kprintf("REGION OFFSET BEGIN END SIZE NAME\n");
for (auto& subregion : m_subregions) {
kprintf("%x %x %x -- %x %x %s\n",
@ -534,16 +519,16 @@ void Task::dumpRegions()
}
}
void Task::notify_waiters(pid_t waitee, int exit_status, int signal)
void Process::notify_waiters(pid_t waitee, int exit_status, int signal)
{
ASSERT_INTERRUPTS_DISABLED();
for (auto* task = s_tasks->head(); task; task = task->next()) {
if (task->waitee() == waitee)
task->m_waiteeStatus = (exit_status << 8) | (signal);
for (auto* process = s_processes->head(); process; process = process->next()) {
if (process->waitee() == waitee)
process->m_waiteeStatus = (exit_status << 8) | (signal);
}
}
void Task::sys$exit(int status)
void Process::sys$exit(int status)
{
cli();
#ifdef TASK_DEBUG
@ -552,78 +537,78 @@ void Task::sys$exit(int status)
setState(Exiting);
s_tasks->remove(this);
s_processes->remove(this);
notify_waiters(m_pid, status, 0);
if (!scheduleNewTask()) {
kprintf("Task::sys$exit: Failed to schedule a new task :(\n");
if (!scheduleNewProcess()) {
kprintf("Process::sys$exit: Failed to schedule a new process :(\n");
HANG;
}
s_deadTasks->append(this);
s_deadProcesses->append(this);
switchNow();
}
void Task::murder(int signal)
void Process::murder(int signal)
{
ASSERT_INTERRUPTS_DISABLED();
bool wasCurrent = current == this;
setState(Exiting);
s_tasks->remove(this);
s_processes->remove(this);
notify_waiters(m_pid, 0, signal);
if (wasCurrent) {
kprintf("Current task committing suicide!\n");
if (!scheduleNewTask()) {
kprintf("Task::murder: Failed to schedule a new task :(\n");
kprintf("Current process committing suicide!\n");
if (!scheduleNewProcess()) {
kprintf("Process::murder: Failed to schedule a new process :(\n");
HANG;
}
}
s_deadTasks->append(this);
s_deadProcesses->append(this);
if (wasCurrent)
switchNow();
}
void Task::taskDidCrash(Task* crashedTask)
void Process::processDidCrash(Process* crashedProcess)
{
ASSERT_INTERRUPTS_DISABLED();
if (crashedTask->state() == Crashing) {
if (crashedProcess->state() == Crashing) {
kprintf("Double crash :(\n");
HANG;
}
crashedTask->setState(Crashing);
crashedTask->dumpRegions();
crashedProcess->setState(Crashing);
crashedProcess->dumpRegions();
s_tasks->remove(crashedTask);
s_processes->remove(crashedProcess);
notify_waiters(crashedTask->m_pid, 0, SIGSEGV);
notify_waiters(crashedProcess->m_pid, 0, SIGSEGV);
if (!scheduleNewTask()) {
kprintf("Task::taskDidCrash: Failed to schedule a new task :(\n");
if (!scheduleNewProcess()) {
kprintf("Process::processDidCrash: Failed to schedule a new process :(\n");
HANG;
}
s_deadTasks->append(crashedTask);
s_deadProcesses->append(crashedProcess);
switchNow();
}
void Task::doHouseKeeping()
void Process::doHouseKeeping()
{
InterruptDisabler disabler;
if (s_deadTasks->isEmpty())
if (s_deadProcesses->isEmpty())
return;
Task* next = nullptr;
for (auto* deadTask = s_deadTasks->head(); deadTask; deadTask = next) {
next = deadTask->next();
delete deadTask;
Process* next = nullptr;
for (auto* deadProcess = s_deadProcesses->head(); deadProcess; deadProcess = next) {
next = deadProcess->next();
delete deadProcess;
}
s_deadTasks->clear();
s_deadProcesses->clear();
}
void yield()
@ -636,10 +621,10 @@ void yield()
//kprintf("%s<%u> yield()\n", current->name().characters(), current->pid());
InterruptDisabler disabler;
if (!scheduleNewTask())
if (!scheduleNewProcess())
return;
//kprintf("yield() jumping to new task: %x (%s)\n", current->farPtr().selector, current->name().characters());
//kprintf("yield() jumping to new process: %x (%s)\n", current->farPtr().selector, current->name().characters());
switchNow();
}
@ -654,36 +639,36 @@ void switchNow()
);
}
bool scheduleNewTask()
bool scheduleNewProcess()
{
ASSERT_INTERRUPTS_DISABLED();
if (!current) {
// XXX: The first ever context_switch() goes to the idle task.
// XXX: The first ever context_switch() goes to the idle process.
// This to setup a reliable place we can return to.
return contextSwitch(Task::kernelTask());
return contextSwitch(Process::kernelProcess());
}
// Check and unblock tasks whose wait conditions have been met.
for (auto* task = s_tasks->head(); task; task = task->next()) {
if (task->state() == Task::BlockedSleep) {
if (task->wakeupTime() <= system.uptime) {
task->unblock();
// Check and unblock processes whose wait conditions have been met.
for (auto* process = s_processes->head(); process; process = process->next()) {
if (process->state() == Process::BlockedSleep) {
if (process->wakeupTime() <= system.uptime) {
process->unblock();
continue;
}
}
if (task->state() == Task::BlockedWait) {
if (!Task::fromPID(task->waitee())) {
task->unblock();
if (process->state() == Process::BlockedWait) {
if (!Process::fromPID(process->waitee())) {
process->unblock();
continue;
}
}
if (task->state() == Task::BlockedRead) {
ASSERT(task->m_fdBlockedOnRead != -1);
if (task->m_fileHandles[task->m_fdBlockedOnRead]->hasDataAvailableForRead()) {
task->unblock();
if (process->state() == Process::BlockedRead) {
ASSERT(process->m_fdBlockedOnRead != -1);
if (process->m_fileHandles[process->m_fdBlockedOnRead]->hasDataAvailableForRead()) {
process->unblock();
continue;
}
}
@ -691,46 +676,46 @@ bool scheduleNewTask()
#ifdef SCHEDULER_DEBUG
dbgprintf("Scheduler choices:\n");
for (auto* task = s_tasks->head(); task; task = task->next()) {
//if (task->state() == Task::BlockedWait || task->state() == Task::BlockedSleep)
for (auto* process = s_processes->head(); process; process = process->next()) {
//if (process->state() == Process::BlockedWait || process->state() == Process::BlockedSleep)
// continue;
dbgprintf("%w %s(%u)\n", task->state(), task->name().characters(), task->pid());
dbgprintf("%w %s(%u)\n", process->state(), process->name().characters(), process->pid());
}
#endif
auto* prevHead = s_tasks->head();
auto* prevHead = s_processes->head();
for (;;) {
// Move head to tail.
s_tasks->append(s_tasks->removeHead());
auto* task = s_tasks->head();
s_processes->append(s_processes->removeHead());
auto* process = s_processes->head();
if (task->state() == Task::Runnable || task->state() == Task::Running) {
if (process->state() == Process::Runnable || process->state() == Process::Running) {
#ifdef SCHEDULER_DEBUG
dbgprintf("switch to %s(%u) (%p vs %p)\n", task->name().characters(), task->pid(), task, current);
dbgprintf("switch to %s(%u) (%p vs %p)\n", process->name().characters(), process->pid(), process, current);
#endif
return contextSwitch(task);
return contextSwitch(process);
}
if (task == prevHead) {
// Back at task_head, nothing wants to run.
if (process == prevHead) {
// Back at process_head, nothing wants to run.
kprintf("Nothing wants to run!\n");
kprintf("PID OWNER STATE NSCHED NAME\n");
for (auto* task = s_tasks->head(); task; task = task->next()) {
for (auto* process = s_processes->head(); process; process = process->next()) {
kprintf("%w %w:%w %b %w %s\n",
task->pid(),
task->uid(),
task->gid(),
task->state(),
task->timesScheduled(),
task->name().characters());
process->pid(),
process->uid(),
process->gid(),
process->state(),
process->timesScheduled(),
process->name().characters());
}
kprintf("Switch to kernel task\n");
return contextSwitch(Task::kernelTask());
kprintf("Switch to kernel process\n");
return contextSwitch(Process::kernelProcess());
}
}
}
static bool contextSwitch(Task* t)
static bool contextSwitch(Process* t)
{
t->setTicksLeft(5);
t->didSchedule();
@ -755,14 +740,14 @@ static bool contextSwitch(Task* t)
#endif
if (current) {
// If the last task hasn't blocked (still marked as running),
// If the last process hasn't blocked (still marked as running),
// mark it as runnable for the next round.
if (current->state() == Task::Running)
current->setState(Task::Runnable);
if (current->state() == Process::Running)
current->setState(Process::Runnable);
}
current = t;
t->setState(Task::Running);
t->setState(Process::Running);
if (!t->selector()) {
t->setSelector(allocateGDTEntry());
@ -783,17 +768,17 @@ static bool contextSwitch(Task* t)
return true;
}
Task* Task::fromPID(pid_t pid)
Process* Process::fromPID(pid_t pid)
{
ASSERT_INTERRUPTS_DISABLED();
for (auto* task = s_tasks->head(); task; task = task->next()) {
if (task->pid() == pid)
return task;
for (auto* process = s_processes->head(); process; process = process->next()) {
if (process->pid() == pid)
return process;
}
return nullptr;
}
FileHandle* Task::fileHandleIfExists(int fd)
FileHandle* Process::fileHandleIfExists(int fd)
{
if (fd < 0)
return nullptr;
@ -802,7 +787,7 @@ FileHandle* Task::fileHandleIfExists(int fd)
return nullptr;
}
ssize_t Task::sys$get_dir_entries(int fd, void* buffer, size_t size)
ssize_t Process::sys$get_dir_entries(int fd, void* buffer, size_t size)
{
VALIDATE_USER_WRITE(buffer, size);
auto* handle = fileHandleIfExists(fd);
@ -811,7 +796,7 @@ ssize_t Task::sys$get_dir_entries(int fd, void* buffer, size_t size)
return handle->get_dir_entries((byte*)buffer, size);
}
int Task::sys$lseek(int fd, off_t offset, int whence)
int Process::sys$lseek(int fd, off_t offset, int whence)
{
auto* handle = fileHandleIfExists(fd);
if (!handle)
@ -819,7 +804,7 @@ int Task::sys$lseek(int fd, off_t offset, int whence)
return handle->seek(offset, whence);
}
int Task::sys$ttyname_r(int fd, char* buffer, size_t size)
int Process::sys$ttyname_r(int fd, char* buffer, size_t size)
{
VALIDATE_USER_WRITE(buffer, size);
auto* handle = fileHandleIfExists(fd);
@ -834,34 +819,34 @@ int Task::sys$ttyname_r(int fd, char* buffer, size_t size)
return 0;
}
ssize_t Task::sys$write(int fd, const void* data, size_t size)
ssize_t Process::sys$write(int fd, const void* data, size_t size)
{
VALIDATE_USER_READ(data, size);
#ifdef DEBUG_IO
kprintf("Task::sys$write: called(%d, %p, %u)\n", fd, data, size);
kprintf("Process::sys$write: called(%d, %p, %u)\n", fd, data, size);
#endif
auto* handle = fileHandleIfExists(fd);
#ifdef DEBUG_IO
kprintf("Task::sys$write: handle=%p\n", handle);
kprintf("Process::sys$write: handle=%p\n", handle);
#endif
if (!handle)
return -EBADF;
auto nwritten = handle->write((const byte*)data, size);
#ifdef DEBUG_IO
kprintf("Task::sys$write: nwritten=%u\n", nwritten);
kprintf("Process::sys$write: nwritten=%u\n", nwritten);
#endif
return nwritten;
}
ssize_t Task::sys$read(int fd, void* outbuf, size_t nread)
ssize_t Process::sys$read(int fd, void* outbuf, size_t nread)
{
VALIDATE_USER_WRITE(outbuf, nread);
#ifdef DEBUG_IO
kprintf("Task::sys$read: called(%d, %p, %u)\n", fd, outbuf, nread);
kprintf("Process::sys$read: called(%d, %p, %u)\n", fd, outbuf, nread);
#endif
auto* handle = fileHandleIfExists(fd);
#ifdef DEBUG_IO
kprintf("Task::sys$read: handle=%p\n", handle);
kprintf("Process::sys$read: handle=%p\n", handle);
#endif
if (!handle)
return -EBADF;
@ -874,12 +859,12 @@ ssize_t Task::sys$read(int fd, void* outbuf, size_t nread)
}
nread = handle->read((byte*)outbuf, nread);
#ifdef DEBUG_IO
kprintf("Task::sys$read: nread=%u\n", nread);
kprintf("Process::sys$read: nread=%u\n", nread);
#endif
return nread;
}
int Task::sys$close(int fd)
int Process::sys$close(int fd)
{
auto* handle = fileHandleIfExists(fd);
if (!handle)
@ -888,7 +873,7 @@ int Task::sys$close(int fd)
return 0;
}
int Task::sys$lstat(const char* path, Unix::stat* statbuf)
int Process::sys$lstat(const char* path, Unix::stat* statbuf)
{
VALIDATE_USER_WRITE(statbuf, sizeof(Unix::stat));
int error;
@ -899,7 +884,7 @@ int Task::sys$lstat(const char* path, Unix::stat* statbuf)
return 0;
}
int Task::sys$stat(const char* path, Unix::stat* statbuf)
int Process::sys$stat(const char* path, Unix::stat* statbuf)
{
VALIDATE_USER_WRITE(statbuf, sizeof(Unix::stat));
int error;
@ -910,7 +895,7 @@ int Task::sys$stat(const char* path, Unix::stat* statbuf)
return 0;
}
int Task::sys$readlink(const char* path, char* buffer, size_t size)
int Process::sys$readlink(const char* path, char* buffer, size_t size)
{
VALIDATE_USER_READ(path, strlen(path));
VALIDATE_USER_WRITE(buffer, size);
@ -933,7 +918,7 @@ int Task::sys$readlink(const char* path, char* buffer, size_t size)
return 0;
}
int Task::sys$chdir(const char* path)
int Process::sys$chdir(const char* path)
{
VALIDATE_USER_READ(path, strlen(path));
int error;
@ -946,7 +931,7 @@ int Task::sys$chdir(const char* path)
return 0;
}
int Task::sys$getcwd(char* buffer, size_t size)
int Process::sys$getcwd(char* buffer, size_t size)
{
VALIDATE_USER_WRITE(buffer, size);
auto path = VirtualFileSystem::the().absolutePath(cwdInode());
@ -958,10 +943,10 @@ int Task::sys$getcwd(char* buffer, size_t size)
return -ENOTIMPL;
}
int Task::sys$open(const char* path, int options)
int Process::sys$open(const char* path, int options)
{
#ifdef DEBUG_IO
kprintf("Task::sys$open(): PID=%u, path=%s {%u}\n", m_pid, path, pathLength);
kprintf("Process::sys$open(): PID=%u, path=%s {%u}\n", m_pid, path, pathLength);
#endif
VALIDATE_USER_READ(path, strlen(path));
if (m_fileHandles.size() >= m_maxFileHandles)
@ -979,7 +964,7 @@ int Task::sys$open(const char* path, int options)
return fd;
}
int Task::sys$uname(utsname* buf)
int Process::sys$uname(utsname* buf)
{
VALIDATE_USER_WRITE(buf, sizeof(utsname));
strcpy(buf->sysname, "Serenity");
@ -990,7 +975,7 @@ int Task::sys$uname(utsname* buf)
return 0;
}
int Task::sys$kill(pid_t pid, int sig)
int Process::sys$kill(pid_t pid, int sig)
{
(void) sig;
if (pid == 0) {
@ -1003,7 +988,7 @@ int Task::sys$kill(pid_t pid, int sig)
}
ASSERT(pid != current->pid()); // FIXME: Support this scenario.
InterruptDisabler disabler;
auto* peer = Task::fromPID(pid);
auto* peer = Process::fromPID(pid);
if (!peer)
return -ESRCH;
if (sig == SIGKILL) {
@ -1015,7 +1000,7 @@ int Task::sys$kill(pid_t pid, int sig)
return -1;
}
int Task::sys$sleep(unsigned seconds)
int Process::sys$sleep(unsigned seconds)
{
if (!seconds)
return 0;
@ -1023,7 +1008,7 @@ int Task::sys$sleep(unsigned seconds)
return 0;
}
int Task::sys$gettimeofday(timeval* tv)
int Process::sys$gettimeofday(timeval* tv)
{
VALIDATE_USER_WRITE(tv, sizeof(tv));
InterruptDisabler disabler;
@ -1033,28 +1018,28 @@ int Task::sys$gettimeofday(timeval* tv)
return 0;
}
uid_t Task::sys$getuid()
uid_t Process::sys$getuid()
{
return m_uid;
}
gid_t Task::sys$getgid()
gid_t Process::sys$getgid()
{
return m_gid;
}
pid_t Task::sys$getpid()
pid_t Process::sys$getpid()
{
return m_pid;
}
pid_t Task::sys$waitpid(pid_t waitee, int* wstatus, int options)
pid_t Process::sys$waitpid(pid_t waitee, int* wstatus, int options)
{
if (wstatus)
VALIDATE_USER_WRITE(wstatus, sizeof(int));
InterruptDisabler disabler;
if (!Task::fromPID(waitee))
if (!Process::fromPID(waitee))
return -1;
m_waitee = waitee;
m_waiteeStatus = 0;
@ -1065,21 +1050,21 @@ pid_t Task::sys$waitpid(pid_t waitee, int* wstatus, int options)
return m_waitee;
}
void Task::unblock()
void Process::unblock()
{
ASSERT(m_state != Task::Runnable && m_state != Task::Running);
ASSERT(m_state != Process::Runnable && m_state != Process::Running);
system.nblocked--;
m_state = Task::Runnable;
m_state = Process::Runnable;
}
void Task::block(Task::State state)
void Process::block(Process::State state)
{
ASSERT(current->state() == Task::Running);
ASSERT(current->state() == Process::Running);
system.nblocked++;
current->setState(state);
}
void block(Task::State state)
void block(Process::State state)
{
current->block(state);
yield();
@ -1087,19 +1072,19 @@ void block(Task::State state)
void sleep(DWORD ticks)
{
ASSERT(current->state() == Task::Running);
ASSERT(current->state() == Process::Running);
current->setWakeupTime(system.uptime + ticks);
current->block(Task::BlockedSleep);
current->block(Process::BlockedSleep);
yield();
}
Task* Task::kernelTask()
Process* Process::kernelProcess()
{
ASSERT(s_kernelTask);
return s_kernelTask;
ASSERT(s_kernelProcess);
return s_kernelProcess;
}
Task::Region::Region(LinearAddress a, size_t s, RetainPtr<Zone>&& z, String&& n)
Process::Region::Region(LinearAddress a, size_t s, RetainPtr<Zone>&& z, String&& n)
: linearAddress(a)
, size(s)
, zone(move(z))
@ -1107,11 +1092,11 @@ Task::Region::Region(LinearAddress a, size_t s, RetainPtr<Zone>&& z, String&& n)
{
}
Task::Region::~Region()
Process::Region::~Region()
{
}
Task::Subregion::Subregion(Region& r, dword o, size_t s, LinearAddress l, String&& n)\
Process::Subregion::Subregion(Region& r, dword o, size_t s, LinearAddress l, String&& n)\
: region(r)
, offset(o)
, size(s)
@ -1121,11 +1106,11 @@ Task::Subregion::Subregion(Region& r, dword o, size_t s, LinearAddress l, String
}
Task::Subregion::~Subregion()
Process::Subregion::~Subregion()
{
}
bool Task::isValidAddressForKernel(LinearAddress laddr) const
bool Process::isValidAddressForKernel(LinearAddress laddr) const
{
// We check extra carefully here since the first 4MB of the address space is identity-mapped.
// This code allows access outside of the known used address ranges to get caught.
@ -1138,13 +1123,13 @@ bool Task::isValidAddressForKernel(LinearAddress laddr) const
return validate_user_read(laddr);
}
bool Task::validate_user_read(LinearAddress laddr) const
bool Process::validate_user_read(LinearAddress laddr) const
{
InterruptDisabler disabler;
return MM.validate_user_read(*this, laddr);
}
bool Task::validate_user_write(LinearAddress laddr) const
bool Process::validate_user_write(LinearAddress laddr) const
{
InterruptDisabler disabler;
return MM.validate_user_write(*this, laddr);

46
Kernel/Process.h
View file

@ -9,27 +9,19 @@
#include <VirtualFileSystem/VirtualFileSystem.h>
#include "TTY.h"
//#define TASK_SANITY_CHECKS
class FileHandle;
class Zone;
class Task : public InlineLinkedListNode<Task> {
friend class InlineLinkedListNode<Task>;
class Process : public InlineLinkedListNode<Process> {
friend class InlineLinkedListNode<Process>;
struct Region;
struct Subregion;
public:
static Task* createKernelTask(void (*entry)(), String&& name);
static Task* createUserTask(const String& path, uid_t, gid_t, pid_t parentPID, int& error, const char** args = nullptr, TTY* = nullptr);
~Task();
static Process* createKernelProcess(void (*entry)(), String&& name);
static Process* createUserProcess(const String& path, uid_t, gid_t, pid_t parentPID, int& error, const char** args = nullptr, TTY* = nullptr);
~Process();
static Vector<Task*> allTasks();
#ifdef TASK_SANITY_CHECKS
static void checkSanity(const char* msg = nullptr);
#else
static void checkSanity(const char*) { }
#endif
static Vector<Process*> allProcesses();
enum State {
Invalid = 0,
@ -51,8 +43,8 @@ public:
bool isRing0() const { return m_ring == Ring0; }
bool isRing3() const { return m_ring == Ring3; }
static Task* fromPID(pid_t);
static Task* kernelTask();
static Process* fromPID(pid_t);
static Process* kernelProcess();
const String& name() const { return m_name; }
pid_t pid() const { return m_pid; }
@ -71,13 +63,13 @@ public:
static void doHouseKeeping();
void block(Task::State);
void block(Process::State);
void unblock();
void setWakeupTime(DWORD t) { m_wakeupTime = t; }
DWORD wakeupTime() const { return m_wakeupTime; }
static void prepForIRETToNewTask();
static void prepForIRETToNewProcess();
bool tick() { ++m_ticks; return --m_ticksLeft; }
void setTicksLeft(DWORD t) { m_ticksLeft = t; }
@ -117,7 +109,7 @@ public:
static void initialize();
static void taskDidCrash(Task*);
static void processDidCrash(Process*);
const TTY* tty() const { return m_tty; }
@ -147,16 +139,16 @@ public:
private:
friend class MemoryManager;
friend bool scheduleNewTask();
friend bool scheduleNewProcess();
Task(String&& name, uid_t, gid_t, pid_t parentPID, RingLevel, RetainPtr<VirtualFileSystem::Node>&& cwd = nullptr, RetainPtr<VirtualFileSystem::Node>&& executable = nullptr, TTY* = nullptr);
Process(String&& name, uid_t, gid_t, pid_t parentPID, RingLevel, RetainPtr<VirtualFileSystem::Node>&& cwd = nullptr, RetainPtr<VirtualFileSystem::Node>&& executable = nullptr, TTY* = nullptr);
void allocateLDT();
dword* m_pageDirectory { nullptr };
Task* m_prev { nullptr };
Task* m_next { nullptr };
Process* m_prev { nullptr };
Process* m_next { nullptr };
String m_name;
void (*m_entry)() { nullptr };
@ -228,12 +220,10 @@ private:
Vector<String> m_initialEnvironment;
};
extern void task_init();
extern void yield();
extern bool scheduleNewTask();
extern bool scheduleNewProcess();
extern void switchNow();
extern void block(Task::State);
extern void block(Process::State);
extern void sleep(DWORD ticks);
/* The currently executing task. NULL during kernel bootup. */
extern Task* current;
extern Process* current;

2
Kernel/Syscall.cpp
View file

@ -1,5 +1,5 @@
#include "i386.h"
#include "Task.h"
#include "Process.h"
#include "Syscall.h"
#include "Console.h"

2
Kernel/VGA.cpp
View file

@ -3,7 +3,7 @@
#include "i386.h"
#include "IO.h"
#include "StdLib.h"
#include "Task.h"
#include "Process.h"
static byte* vga_mem = nullptr;

11
Kernel/i386.cpp
View file

@ -3,7 +3,7 @@
#include "VGA.h"
#include "i386.h"
#include "Assertions.h"
#include "Task.h"
#include "Process.h"
#include "MemoryManager.h"
#include "IRQHandler.h"
#include "PIC.h"
@ -153,8 +153,7 @@ void exception_6_handler()
}
HANG;
// NOTE: This will schedule a new task.
Task::taskDidCrash(current);
Process::processDidCrash(current);
}
// 13: General Protection Fault
@ -184,8 +183,7 @@ void exception_13_handler()
HANG;
}
// NOTE: This will schedule a new task.
Task::taskDidCrash(current);
Process::processDidCrash(current);
}
// 14: Page Fault
@ -239,8 +237,7 @@ void exception_14_handler()
if (response == PageFaultResponse::ShouldCrash) {
kprintf("Crashing after unresolved page fault\n");
// NOTE: This will schedule a new task.
Task::taskDidCrash(current);
Process::processDidCrash(current);
} else if (response == PageFaultResponse::Continue) {
kprintf("Continuing after resolved page fault\n");
} else {

22
Kernel/i8253.cpp
View file

@ -2,7 +2,7 @@
#include "i386.h"
#include "IO.h"
#include "VGA.h"
#include "Task.h"
#include "Process.h"
#include "system.h"
#include "PIC.h"
@ -77,8 +77,6 @@ void clock_handle()
if (current->tick())
return;
//return;
auto& regs = *reinterpret_cast<RegisterDump*>(state_dump);
current->tss().gs = regs.gs;
current->tss().fs = regs.fs;
@ -95,31 +93,19 @@ void clock_handle()
current->tss().cs = regs.cs;
current->tss().eflags = regs.eflags;
// Compute task ESP.
// Compute process stack pointer.
// Add 12 for CS, EIP, EFLAGS (interrupt mechanic)
// FIXME: Hmm. Should we add an extra 8 here for SS:ESP in some cases?
// If this IRQ occurred while in a user task, wouldn't that also push the stack ptr?
current->tss().esp = regs.esp + 12;
current->tss().ss = regs.ss;
if ((current->tss().cs & 3) != 0) {
#if 0
dbgprintf("clock'ed across to ring0\n");
dbgprintf("code: %w:%x\n", current->tss().cs, current->tss().eip);
dbgprintf(" stk: %w:%x\n", current->tss().ss, current->tss().esp);
dbgprintf("astk: %w:%x\n", regs.ss_if_crossRing, regs.esp_if_crossRing);
//HANG;
#endif
current->tss().ss = regs.ss_if_crossRing;
current->tss().esp = regs.esp_if_crossRing;
}
// Prepare a new task to run;
if (!scheduleNewTask())
if (!scheduleNewProcess())
return;
Task::prepForIRETToNewTask();
Process::prepForIRETToNewProcess();
// Set the NT (nested task) flag.
asm(

26
Kernel/init.cpp
View file

@ -4,7 +4,7 @@
#include "i386.h"
#include "i8253.h"
#include "Keyboard.h"
#include "Task.h"
#include "Process.h"
#include "system.h"
#include "Disk.h"
#include "PIC.h"
@ -96,7 +96,7 @@ static void undertaker_main() NORETURN;
static void undertaker_main()
{
for (;;) {
Task::doHouseKeeping();
Process::doHouseKeeping();
sleep(300);
}
}
@ -178,9 +178,9 @@ static void init_stage2()
for (unsigned i = 0; i < 100; ++i) {
int error;
auto* shTask = Task::createUserTask("/bin/id", (uid_t)100, (gid_t)100, (pid_t)0, error);
auto* shProcess = Process::createUserProcess("/bin/id", (uid_t)100, (gid_t)100, (pid_t)0, error);
kprintf("malloc stats: alloc:%u free:%u\n", sum_alloc, sum_free);
kprintf("sizeof(Task):%u\n", sizeof(Task));
kprintf("sizeof(Process):%u\n", sizeof(Process));
kprintf("delta:%u\n",sum_alloc - lastAlloc);
lastAlloc = sum_alloc;
sleep(600);
@ -188,11 +188,11 @@ static void init_stage2()
#endif
int error;
auto* sh0 = Task::createUserTask("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty0);
auto* sh0 = Process::createUserProcess("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty0);
#ifdef SPAWN_MULTIPLE_SHELLS
auto* sh1 = Task::createUserTask("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty1);
auto* sh2 = Task::createUserTask("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty2);
auto* sh3 = Task::createUserTask("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty3);
auto* sh1 = Process::createUserProcess("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty1);
auto* sh2 = Process::createUserProcess("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty2);
auto* sh3 = Process::createUserProcess("/bin/sh", (uid_t)100, (gid_t)100, (pid_t)0, error, nullptr, tty3);
#endif
#if 0
@ -253,16 +253,16 @@ void init()
auto procfs = ProcFileSystem::create();
procfs->initialize();
Task::initialize();
Process::initialize();
Task::createKernelTask(undertaker_main, "undertaker");
Task::createKernelTask(init_stage2, "init");
Process::createKernelProcess(undertaker_main, "undertaker");
Process::createKernelProcess(init_stage2, "init");
scheduleNewTask();
scheduleNewProcess();
sti();
// This now becomes the idle task :^)
// This now becomes the idle process :^)
for (;;) {
asm("hlt");
}

1
VirtualFileSystem/FileHandle.cpp
View file

@ -5,7 +5,6 @@
#include "UnixTypes.h"
#include "TTY.h"
#include <AK/BufferStream.h>
#include <Kernel/Task.h>
FileHandle::FileHandle(RetainPtr<VirtualFileSystem::Node>&& vnode)
: m_vnode(move(vnode))