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Kernel: Store current processor pointer in IA32_GS_BASE

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This allows easier access to processors fields
This commit is contained in:
Bananymous
2024-03-07 16:05:29 +02:00
parent efed67cbd0
commit 29fd682672
13 changed files with 119 additions and 98 deletions
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1
kernel/include/kernel/GDT.h
View File

@@ -61,6 +61,7 @@ namespace Kernel
public:
static GDT* create();
void load() { flush_gdt(); flush_tss(); }
static constexpr inline bool is_user_segment(uint8_t segment)
{

12
kernel/include/kernel/IDT.h
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@@ -34,23 +34,23 @@ namespace Kernel
BAN_NON_MOVABLE(IDT);
public:
static IDT* create();
static IDT* create(bool is_bsb);
[[noreturn]] static void force_triple_fault();
void register_irq_handler(uint8_t irq, Interruptable* interruptable);
void load()
{
asm volatile("lidt %0" :: "m"(m_idtr) : "memory");
}
private:
IDT() = default;
void register_interrupt_handler(uint8_t index, void (*handler)());
void register_syscall_handler(uint8_t index, void (*handler)());
void flush()
{
asm volatile("lidt %0" :: "m"(m_idtr) : "memory");
}
private:
BAN::Array<GateDescriptor, 0x100> m_idt;
IDTR m_idtr {

2
kernel/include/kernel/Memory/PageTable.h
View File

@@ -40,7 +40,7 @@ namespace Kernel
static void initialize();
static PageTable& kernel();
static PageTable& current() { return *reinterpret_cast<PageTable*>(Processor::current().m_current_page_table); }
static PageTable& current() { return *reinterpret_cast<PageTable*>(Processor::get_current_page_table()); }
static constexpr vaddr_t fast_page() { return KERNEL_OFFSET; }

76
kernel/include/kernel/Processor.h
View File

@@ -22,18 +22,13 @@ namespace Kernel
class Processor
{
BAN_NON_COPYABLE(Processor);
BAN_NON_MOVABLE(Processor);
public:
static Processor& create(ProcessorID id);
static Processor& initialize();
static ProcessorID current_id()
{
uint16_t id;
asm volatile("movw %%gs, %0" : "=rm"(id));
return id;
}
static Processor& get(ProcessorID);
static Processor& current() { return get(current_id()); }
static ProcessorID current_id() { return read_gs_sized<ProcessorID>(offsetof(Processor, m_id)); }
static ProcessorID bsb_id() { return s_bsb_id; }
static bool current_is_bsb() { return current_id() == bsb_id(); }
@@ -55,42 +50,71 @@ namespace Kernel
return InterruptState::Disabled;
};
uintptr_t stack_bottom() const { return reinterpret_cast<uintptr_t>(m_stack); }
uintptr_t stack_top() const { return stack_bottom() + m_stack_size; }
static uintptr_t current_stack_bottom() { return reinterpret_cast<uintptr_t>(read_gs_ptr(offsetof(Processor, m_stack))); }
static uintptr_t current_stack_top() { return current_stack_bottom() + s_stack_size; }
void initialize();
uintptr_t stack_bottom() const { return reinterpret_cast<uintptr_t>(m_stack); }
uintptr_t stack_top() const { return stack_bottom() + s_stack_size; }
GDT& gdt() { ASSERT(m_gdt); return *m_gdt; }
IDT& idt() { ASSERT(m_idt); return *m_idt; }
static GDT& gdt() { return *reinterpret_cast<GDT*>(read_gs_ptr(offsetof(Processor, m_gdt))); }
static IDT& idt() { return *reinterpret_cast<IDT*>(read_gs_ptr(offsetof(Processor, m_idt))); }
static void* get_current_page_table() { return read_gs_ptr(offsetof(Processor, m_current_page_table)); }
static void set_current_page_table(void* page_table) { write_gs_ptr(offsetof(Processor, m_current_page_table), page_table); }
private:
Processor() = default;
Processor(Processor&& other)
~Processor() { ASSERT_NOT_REACHED(); }
template<typename T>
static T read_gs_sized(uintptr_t offset) requires(sizeof(T) <= 8)
{
m_stack = other.m_stack;
other.m_stack = nullptr;
m_gdt = other.m_gdt;
other.m_gdt = nullptr;
m_idt = other.m_idt;
other.m_idt = nullptr;
#define __ASM_INPUT(operation) operation " %%gs:(%[offset]), %[result]" : [result]"=rm"(result) : [offset]"rm"(offset)
T result;
if constexpr(sizeof(T) == 8)
asm volatile(__ASM_INPUT("movq"));
if constexpr(sizeof(T) == 4)
asm volatile(__ASM_INPUT("movl"));
if constexpr(sizeof(T) == 2)
asm volatile(__ASM_INPUT("movw"));
if constexpr(sizeof(T) == 1)
asm volatile(__ASM_INPUT("movb"));
return result;
#undef __ASM_INPUT
}
~Processor();
template<typename T>
static void write_gs_sized(uintptr_t offset, T value) requires(sizeof(T) <= 8)
{
#define __ASM_INPUT(operation) operation " %[value], %%gs:(%[offset])" :: [value]"rm"(value), [offset]"rm"(offset) : "memory"
if constexpr(sizeof(T) == 8)
asm volatile(__ASM_INPUT("movq"));
if constexpr(sizeof(T) == 4)
asm volatile(__ASM_INPUT("movl"));
if constexpr(sizeof(T) == 2)
asm volatile(__ASM_INPUT("movw"));
if constexpr(sizeof(T) == 1)
asm volatile(__ASM_INPUT("movb"));
#undef __ASM_INPUT
}
static void* read_gs_ptr(uintptr_t offset) { return read_gs_sized<void*>(offset); }
static void write_gs_ptr(uintptr_t offset, void* value) { write_gs_sized<void*>(offset, value); }
private:
static ProcessorID s_bsb_id;
ProcessorID m_id { PROCESSOR_NONE };
static constexpr size_t s_stack_size { 4096 };
void* m_stack { nullptr };
static constexpr size_t m_stack_size { 4096 };
GDT* m_gdt { nullptr };
IDT* m_idt { nullptr };
void* m_current_page_table { nullptr };
friend class BAN::Vector<Processor>;
friend class PageTable;
friend class BAN::Array<Processor, 0xFF>;
};
#else
#error