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Kernel: Add initial implementation of Processor in aarch64

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Instead of storing the current Processor into a core local register, we
currently just store it into a global, since we don't support SMP for
aarch64 anyway. This simplifies the initial implementation.
This commit is contained in:
Timon Kruiper 2022-05-09 12:14:20 +02:00 • committed by Linus Groh
parent ed4bfaed12
commit c515e1341a
4 changed files with 57 additions and 14 deletions
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22
Kernel/Arch/aarch64/init.cpp
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@ -10,9 +10,8 @@
#include <AK/Format.h>
#include <AK/Types.h>
#include <Kernel/Arch/aarch64/ASM_wrapper.h>
#include <Kernel/Arch/Processor.h>
#include <Kernel/Arch/aarch64/BootPPMParser.h>
#include <Kernel/Arch/aarch64/Prekernel/Aarch64_asm_utils.h>
#include <Kernel/Arch/aarch64/Prekernel/Prekernel.h>
#include <Kernel/Arch/aarch64/RPi/Framebuffer.h>
#include <Kernel/Arch/aarch64/RPi/Mailbox.h>
@ -44,6 +43,12 @@ extern ctor_func_t end_heap_ctors[];
extern ctor_func_t start_ctors[];
extern ctor_func_t end_ctors[];
ALWAYS_INLINE static Kernel::Processor& bootstrap_processor()
{
alignas(Kernel::Processor) static u8 bootstrap_processor_storage[sizeof(Kernel::Processor)];
return (Kernel::Processor&)bootstrap_processor_storage;
}
extern "C" [[noreturn]] void init()
{
dbgln("Welcome to Serenity OS!");
@ -51,6 +56,9 @@ extern "C" [[noreturn]] void init()
dbgln("Observed deviations from that ideal are shortcomings of your imagination.");
dbgln();
new (&bootstrap_processor()) Kernel::Processor();
bootstrap_processor().initialize(0);
// We call the constructors of kmalloc.cpp separately, because other constructors in the Kernel
// might rely on being able to call new/kmalloc in the constructor. We do have to run the
// kmalloc constructors, because kmalloc_init relies on that.
@ -66,16 +74,6 @@ extern "C" [[noreturn]] void init()
auto firmware_version = query_firmware_version();
dbgln("Firmware version: {}", firmware_version);
auto current_exception_level = static_cast<u64>(Kernel::Aarch64::Asm::get_current_exception_level());
dbgln("CPU started in: EL{}", current_exception_level);
dbgln("Drop CPU to EL1");
Prekernel::drop_to_exception_level_1();
// Load EL1 vector table
extern uintptr_t vector_table_el1;
el1_vector_table_install(&vector_table_el1);
dbgln("Initialize MMU");
Prekernel::init_prekernel_page_tables();