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Kernel: Rename Thread::tss to Thread::regs and add x86_64 support

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We're using software context switches so calling this struct tss is
somewhat misleading.
This commit is contained in:
Gunnar Beutner 2021-06-26 19:57:16 +02:00 • committed by Andreas Kling
parent eba33f82b8
commit f285241cb8
14 changed files with 246 additions and 204 deletions
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53
Kernel/Thread.cpp
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@ -84,48 +84,51 @@ Thread::Thread(NonnullRefPtr<Process> process, NonnullOwnPtr<Region> kernel_stac
m_fpu_state = (FPUState*)kmalloc_aligned<16>(sizeof(FPUState));
reset_fpu_state();
m_tss.iomapbase = sizeof(TSS32);
#if ARCH(I386)
// Only IF is set when a process boots.
m_tss.eflags = 0x0202;
m_regs.eflags = 0x0202;
if (m_process->is_kernel_process()) {
m_tss.cs = GDT_SELECTOR_CODE0;
m_tss.ds = GDT_SELECTOR_DATA0;
m_tss.es = GDT_SELECTOR_DATA0;
m_tss.fs = GDT_SELECTOR_PROC;
m_tss.ss = GDT_SELECTOR_DATA0;
m_tss.gs = 0;
m_regs.cs = GDT_SELECTOR_CODE0;
m_regs.ds = GDT_SELECTOR_DATA0;
m_regs.es = GDT_SELECTOR_DATA0;
m_regs.fs = GDT_SELECTOR_PROC;
m_regs.ss = GDT_SELECTOR_DATA0;
m_regs.gs = 0;
} else {
m_tss.cs = GDT_SELECTOR_CODE3 | 3;
m_tss.ds = GDT_SELECTOR_DATA3 | 3;
m_tss.es = GDT_SELECTOR_DATA3 | 3;
m_tss.fs = GDT_SELECTOR_DATA3 | 3;
m_tss.ss = GDT_SELECTOR_DATA3 | 3;
m_tss.gs = GDT_SELECTOR_TLS | 3;
m_regs.cs = GDT_SELECTOR_CODE3 | 3;
m_regs.ds = GDT_SELECTOR_DATA3 | 3;
m_regs.es = GDT_SELECTOR_DATA3 | 3;
m_regs.fs = GDT_SELECTOR_DATA3 | 3;
m_regs.ss = GDT_SELECTOR_DATA3 | 3;
m_regs.gs = GDT_SELECTOR_TLS | 3;
}
m_tss.cr3 = m_process->space().page_directory().cr3();
#else
PANIC("Thread::Thread() not implemented");
m_regs.rflags = 0x0202;
#endif
m_regs.cr3 = m_process->space().page_directory().cr3();
m_kernel_stack_base = m_kernel_stack_region->vaddr().get();
m_kernel_stack_top = m_kernel_stack_region->vaddr().offset(default_kernel_stack_size).get() & 0xfffffff8u;
#if ARCH(I386)
if (m_process->is_kernel_process()) {
m_tss.esp = m_tss.esp0 = m_kernel_stack_top;
#if ARCH(I386)
m_regs.esp = m_regs.esp0 = m_kernel_stack_top;
#else
m_regs.rsp = m_regs.rsp0 = m_kernel_stack_top;
#endif
} else {
// Ring 3 processes get a separate stack for ring 0.
// The ring 3 stack will be assigned by exec().
m_tss.ss0 = GDT_SELECTOR_DATA0;
m_tss.esp0 = m_kernel_stack_top;
}
#if ARCH(I386)
m_regs.ss0 = GDT_SELECTOR_DATA0;
m_regs.esp0 = m_kernel_stack_top;
#else
PANIC("Thread::Thread() not implemented");
m_regs.rsp0 = m_kernel_stack_top;
#endif
}
// We need to add another reference if we could successfully create
// all the resources needed for this thread. The reason for this is that
@ -864,9 +867,9 @@ DispatchSignalResult Thread::dispatch_signal(u8 signal)
#endif
#if ARCH(I386)
dbgln_if(SIGNAL_DEBUG, "Thread in state '{}' has been primed with signal handler {:04x}:{:08x} to deliver {}", state_string(), m_tss.cs, m_tss.eip, signal);
dbgln_if(SIGNAL_DEBUG, "Thread in state '{}' has been primed with signal handler {:04x}:{:08x} to deliver {}", state_string(), m_regs.cs, m_regs.eip, signal);
#else
PANIC("Thread:dispatch_signal() not implemented");
dbgln_if(SIGNAL_DEBUG, "Thread in state '{}' has been primed with signal handler {:04x}:{:16x} to deliver {}", state_string(), m_regs.cs, m_regs.rip, signal);
#endif
return DispatchSignalResult::Continue;