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https://github.com/RGBCube/serenity
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Kernel: Take some baby steps towards x86_64
Make more of the kernel compile in 64-bit mode, and make some things pointer-size-agnostic (by using FlatPtr.) There's a lot of work to do here before the kernel will even compile.
This commit is contained in:
Andreas Kling
parent
eb08a0edd5
commit
8f70528f30
12 changed files with 187 additions and 118 deletions
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@ -210,9 +210,7 @@ void page_fault_handler(TrapFrame* trap)
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clac();
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auto& regs = *trap->regs;
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u32 fault_address;
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asm("movl %%cr2, %%eax"
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: "=a"(fault_address));
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auto fault_address = read_cr2();
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if constexpr (PAGE_FAULT_DEBUG) {
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u32 fault_page_directory = read_cr3();
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@ -717,14 +715,22 @@ void exit_trap(TrapFrame* trap)
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return Processor::current().exit_trap(*trap);
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}
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UNMAP_AFTER_INIT void write_cr0(u32 value)
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UNMAP_AFTER_INIT void write_cr0(FlatPtr value)
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{
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asm volatile("movl %%eax, %%cr0" ::"a"(value));
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#if ARCH(I386)
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asm volatile("mov %%eax, %%cr0" ::"a"(value));
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#else
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asm volatile("mov %%rax, %%cr0" ::"a"(value));
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#endif
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}
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UNMAP_AFTER_INIT void write_cr4(u32 value)
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UNMAP_AFTER_INIT void write_cr4(FlatPtr value)
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{
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asm volatile("movl %%eax, %%cr4" ::"a"(value));
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#if ARCH(I386)
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asm volatile("mov %%eax, %%cr4" ::"a"(value));
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#else
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asm volatile("mov %%rax, %%cr4" ::"a"(value));
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#endif
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}
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UNMAP_AFTER_INIT static void sse_init()
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@ -733,50 +739,80 @@ UNMAP_AFTER_INIT static void sse_init()
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write_cr4(read_cr4() | 0x600);
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}
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u32 read_cr0()
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FlatPtr read_cr0()
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{
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u32 cr0;
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asm("movl %%cr0, %%eax"
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FlatPtr cr0;
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#if ARCH(I386)
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asm("mov %%cr0, %%eax"
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: "=a"(cr0));
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#else
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asm("mov %%cr0, %%rax"
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: "=a"(cr0));
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#endif
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return cr0;
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}
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u32 read_cr2()
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FlatPtr read_cr2()
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{
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u32 cr2;
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asm("movl %%cr2, %%eax"
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FlatPtr cr2;
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#if ARCH(I386)
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asm("mov %%cr2, %%eax"
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: "=a"(cr2));
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#else
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asm("mov %%cr2, %%rax"
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: "=a"(cr2));
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#endif
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return cr2;
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}
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u32 read_cr3()
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FlatPtr read_cr3()
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{
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u32 cr3;
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asm("movl %%cr3, %%eax"
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FlatPtr cr3;
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#if ARCH(I386)
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asm("mov %%cr3, %%eax"
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: "=a"(cr3));
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#else
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asm("mov %%cr3, %%rax"
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: "=a"(cr3));
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#endif
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return cr3;
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}
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void write_cr3(u32 cr3)
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void write_cr3(FlatPtr cr3)
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{
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// NOTE: If you're here from a GPF crash, it's very likely that a PDPT entry is incorrect, not this!
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asm volatile("movl %%eax, %%cr3" ::"a"(cr3)
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#if ARCH(I386)
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asm volatile("mov %%eax, %%cr3" ::"a"(cr3)
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: "memory");
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#else
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asm volatile("mov %%rax, %%cr3" ::"a"(cr3)
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: "memory");
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#endif
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}
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u32 read_cr4()
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FlatPtr read_cr4()
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{
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u32 cr4;
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asm("movl %%cr4, %%eax"
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FlatPtr cr4;
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#if ARCH(I386)
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asm("mov %%cr4, %%eax"
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: "=a"(cr4));
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#else
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asm("mov %%cr4, %%rax"
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: "=a"(cr4));
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#endif
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return cr4;
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}
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u32 read_dr6()
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FlatPtr read_dr6()
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{
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u32 dr6;
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asm("movl %%dr6, %%eax"
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FlatPtr dr6;
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#if ARCH(I386)
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asm("mov %%dr6, %%eax"
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: "=a"(dr6));
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#else
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asm("mov %%dr6, %%rax"
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: "=a"(dr6));
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#endif
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return dr6;
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}
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@ -1291,6 +1327,7 @@ void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)
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dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context --> switching out of: {} {}", VirtualAddress(from_thread), *from_thread);
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from_thread->save_critical(m_in_critical);
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#if ARCH(I386)
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// clang-format off
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// Switch to new thread context, passing from_thread and to_thread
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// through to the new context using registers edx and eax
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@ -1333,6 +1370,9 @@ void Processor::switch_context(Thread*& from_thread, Thread*& to_thread)
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: "memory"
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);
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// clang-format on
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#else
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PANIC("Context switching not implemented.");
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#endif
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dbgln_if(CONTEXT_SWITCH_DEBUG, "switch_context <-- from {} {} to {} {}", VirtualAddress(from_thread), *from_thread, VirtualAddress(to_thread), *to_thread);
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@ -1576,6 +1616,7 @@ UNMAP_AFTER_INIT void Processor::initialize_context_switching(Thread& initial_th
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m_scheduler_initialized = true;
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#if ARCH(I386)
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// clang-format off
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asm volatile(
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"movl %[new_esp], %%esp \n" // switch to new stack
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@ -1601,6 +1642,7 @@ UNMAP_AFTER_INIT void Processor::initialize_context_switching(Thread& initial_th
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[cpu] "c" (id())
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);
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// clang-format on
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#endif
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VERIFY_NOT_REACHED();
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}
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@ -296,9 +296,9 @@ void load_task_register(u16 selector);
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#define sti() asm volatile("sti" :: \
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: "memory")
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inline u32 cpu_flags()
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inline FlatPtr cpu_flags()
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{
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u32 flags;
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FlatPtr flags;
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asm volatile(
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"pushf\n"
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"pop %0\n"
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@ -441,29 +441,36 @@ private:
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};
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struct [[gnu::packed]] RegisterState {
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u32 ss;
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u32 gs;
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u32 fs;
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u32 es;
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u32 ds;
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u32 edi;
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u32 esi;
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u32 ebp;
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u32 esp;
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u32 ebx;
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u32 edx;
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u32 ecx;
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u32 eax;
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FlatPtr ss;
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FlatPtr gs;
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FlatPtr fs;
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FlatPtr es;
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FlatPtr ds;
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FlatPtr edi;
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FlatPtr esi;
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FlatPtr ebp;
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FlatPtr esp;
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FlatPtr ebx;
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FlatPtr edx;
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FlatPtr ecx;
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FlatPtr eax;
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u16 exception_code;
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u16 isr_number;
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u32 eip;
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u32 cs;
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u32 eflags;
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u32 userspace_esp;
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u32 userspace_ss;
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#if ARCH(X86_64)
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u32 padding;
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#endif
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FlatPtr eip;
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FlatPtr cs;
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FlatPtr eflags;
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FlatPtr userspace_esp;
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FlatPtr userspace_ss;
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};
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#define REGISTER_STATE_SIZE (19 * 4)
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#if ARCH(I386)
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# define REGISTER_STATE_SIZE (19 * 4)
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#else
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# define REGISTER_STATE_SIZE (19 * 8)
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#endif
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static_assert(REGISTER_STATE_SIZE == sizeof(RegisterState));
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void copy_kernel_registers_into_ptrace_registers(PtraceRegisters&, const RegisterState&);
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@ -494,16 +501,16 @@ inline FlatPtr offset_in_page(const void* address)
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return offset_in_page((FlatPtr)address);
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}
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u32 read_cr0();
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u32 read_cr2();
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u32 read_cr3();
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u32 read_cr4();
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FlatPtr read_cr0();
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FlatPtr read_cr2();
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FlatPtr read_cr3();
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FlatPtr read_cr4();
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void write_cr0(u32);
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void write_cr3(u32);
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void write_cr4(u32);
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void write_cr0(FlatPtr);
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void write_cr3(FlatPtr);
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void write_cr4(FlatPtr);
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u32 read_dr6();
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FlatPtr read_dr6();
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static inline bool is_kernel_mode()
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{
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@ -1071,7 +1078,12 @@ struct TrapFrame {
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TrapFrame& operator=(TrapFrame&&) = delete;
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};
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#define TRAP_FRAME_SIZE (3 * sizeof(FlatPtr))
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#if ARCH(I386)
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# define TRAP_FRAME_SIZE (3 * 4)
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#else
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# define TRAP_FRAME_SIZE (3 * 8)
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#endif
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static_assert(TRAP_FRAME_SIZE == sizeof(TrapFrame));
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extern "C" void enter_trap_no_irq(TrapFrame*);
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