x86_64: move files out of the way

3 files changed, 0 insertions, 185 deletions

diff --git a/arch/x86_64/src/context_switching/syscall/main.cpp b/arch/x86_64/src/context_switching/syscall/main.cpp
deleted file mode 100644
index b4ab468..0000000
--- a/arch/x86_64/src/context_switching/syscall/main.cpp
+++ /dev/null
@@ -1,35 +0,0 @@
-#include "arch/context_switching/syscall/main.hpp"
-
-namespace teachos::arch::context_switching::syscall
-{
-  auto syscall(type syscall_number, arguments args) -> response
-  {
-    asm volatile("mov %[input], %%rax"
-                 : /* no output from call */
-                 : [input] "m"(syscall_number)
-                 : "memory");
-
-    asm volatile("mov %[input], %%rdi " : /* no output from call */ : [input] "m"(args.arg_0) : "memory");
-    asm volatile("mov %[input], %%rsi" : /* no output from call */ : [input] "m"(args.arg_1) : "memory");
-    asm volatile("mov %[input], %%rdx" : /* no output from call */ : [input] "m"(args.arg_2) : "memory");
-    asm volatile("mov %[input], %%r10" : /* no output from call */ : [input] "m"(args.arg_3) : "memory");
-    asm volatile("mov %[input], %%r8" : /* no output from call */ : [input] "m"(args.arg_4) : "memory");
-    asm volatile("mov %[input], %%r9" : /* no output from call */ : [input] "m"(args.arg_5) : "memory");
-
-    asm volatile("syscall");
-
-    arguments values{};
-    asm volatile("mov %%rdi, %[output]" : [output] "=m"(values.arg_0));
-    asm volatile("mov %%rsi, %[output]" : [output] "=m"(values.arg_1));
-    asm volatile("mov %%rdx, %[output]" : [output] "=m"(values.arg_2));
-    asm volatile("mov %%r10, %[output]" : [output] "=m"(values.arg_3));
-    asm volatile("mov %%r8, %[output]" : [output] "=m"(values.arg_4));
-    asm volatile("mov %%r9, %[output]" : [output] "=m"(values.arg_5));
-
-    error error_code{};
-    asm volatile("mov %%al, %[output]" : [output] "=m"(error_code));
-
-    return {error_code, values};
-  }
-
-}  // namespace teachos::arch::context_switching::syscall
diff --git a/arch/x86_64/src/context_switching/syscall/syscall_enable.cpp b/arch/x86_64/src/context_switching/syscall/syscall_enable.cpp
deleted file mode 100644
index 3c43336..0000000
--- a/arch/x86_64/src/context_switching/syscall/syscall_enable.cpp
+++ /dev/null
@@ -1,32 +0,0 @@
-#include "arch/context_switching/syscall/syscall_enable.hpp"
-
-#include "arch/context_switching/interrupt_descriptor_table/segment_selector.hpp"
-#include "arch/context_switching/syscall/syscall_handler.hpp"
-#include "arch/kernel/cpu/msr.hpp"
-
-namespace teachos::arch::context_switching::syscall
-{
-  namespace
-  {
-    interrupt_descriptor_table::segment_selector constexpr KERNEL_CODE_SEGMENT_SELECTOR{
-        1U, interrupt_descriptor_table::segment_selector::REQUEST_LEVEL_KERNEL};
-
-    auto constexpr IA32_STAR_ADDRESS = 0xC0000081;
-    auto constexpr IA32_LSTAR_ADDRESS = 0xC0000082;
-    auto constexpr IA32_FMASK_ADDRESS = 0xC0000084;
-
-  }  // namespace
-
-  auto enable_syscall() -> void
-  {
-    uint64_t const syscall_function = reinterpret_cast<uint64_t>(syscall_handler);
-    kernel::cpu::write_msr(IA32_LSTAR_ADDRESS, syscall_function);
-    kernel::cpu::write_msr(IA32_FMASK_ADDRESS, 0U);
-
-    uint64_t const kernel_cs = KERNEL_CODE_SEGMENT_SELECTOR;
-    uint64_t const star_value = (kernel_cs << 32) | (kernel_cs << 48);
-    kernel::cpu::write_msr(IA32_STAR_ADDRESS, star_value);
-
-    kernel::cpu::set_efer_bit(kernel::cpu::efer_flags::SCE);
-  }
-}  // namespace teachos::arch::context_switching::syscall
diff --git a/arch/x86_64/src/context_switching/syscall/syscall_handler.cpp b/arch/x86_64/src/context_switching/syscall/syscall_handler.cpp
deleted file mode 100644
index 84dbe5f..0000000
--- a/arch/x86_64/src/context_switching/syscall/syscall_handler.cpp
+++ /dev/null
@@ -1,118 +0,0 @@
-#include "arch/context_switching/syscall/syscall_handler.hpp"
-
-#include "arch/context_switching/syscall/main.hpp"
-#include "arch/exception_handling/assert.hpp"
-#include "arch/exception_handling/panic.hpp"
-#include "arch/memory/heap/global_heap_allocator.hpp"
-#include "arch/memory/main.hpp"
-#include "arch/video/vga/text.hpp"
-
-namespace teachos::arch::context_switching::syscall
-{
-
-  namespace
-  {
-    auto write_to_vga_buffer(uint64_t buffer) -> response
-    {
-      video::vga::text::write(reinterpret_cast<const char *>(buffer),
-                              video::vga::text::common_attributes::green_on_black);
-      video::vga::text::newline();
-      return {error::OK};
-    }
-
-    auto expand_user_heap() -> response
-    {
-      static auto current_heap_end = memory::heap::USER_HEAP_START;
-      uint64_t const heap_start = current_heap_end;
-      memory::remap_heap(heap_start, memory::heap::USER_HEAP_SIZE, memory::paging::entry::USER_ACCESSIBLE);
-      current_heap_end += memory::heap::USER_HEAP_SIZE;
-      return {error::OK, {heap_start, memory::heap::USER_HEAP_SIZE}};
-    }
-  }  // namespace
-
-  auto syscall_handler() -> void
-  {
-    // Saving state of rcx and r11 because it is required by sysretq to function.
-    // Calls to other functions potentially overwrite these registers, because of
-    // callee saved calling convention.
-    uint64_t return_instruction_pointer, rflags = {};
-    asm volatile("mov %%rcx, %[output]" : [output] "=m"(return_instruction_pointer));
-    asm volatile("mov %%r11, %[output]" : [output] "=m"(rflags));
-
-    uint64_t syscall_number, arg_0, arg_1, arg_2, arg_3, arg_4, arg_5 = {};
-    asm volatile("mov %%rdi, %[output]" : [output] "=m"(arg_0));
-    asm volatile("mov %%rsi, %[output]" : [output] "=m"(arg_1));
-    asm volatile("mov %%rdx, %[output]" : [output] "=m"(arg_2));
-    asm volatile("mov %%r10, %[output]" : [output] "=m"(arg_3));
-    asm volatile("mov %%r8, %[output]" : [output] "=m"(arg_4));
-    asm volatile("mov %%r9, %[output]" : [output] "=m"(arg_5));
-
-    // RAX is read last, because paired with our type enum, we can use it to check
-    // if the register has been written by the compiled code between executing the syscall
-    // and now.
-    asm volatile("mov %%rax, %[output]" : [output] "=m"(syscall_number));
-
-    response result;
-    switch (static_cast<type>(syscall_number))
-    {
-      case type::WRITE:
-        result = write_to_vga_buffer(arg_0);
-        break;
-      case type::EXPAND_HEAP:
-        result = expand_user_heap();
-        break;
-      case type::ASSERT:
-        teachos::arch::exception_handling::assert(arg_0, reinterpret_cast<const char *>(arg_1));
-        break;
-      default:
-        teachos::arch::exception_handling::panic("[Syscall Handler] Invalid syscall number");
-        break;
-    }
-
-    asm volatile("mov %[input], %%rax"
-                 : /* no output from call */
-                 : [input] "m"(result.error_code)
-                 : "memory");
-
-    asm volatile("mov %[input], %%rdi"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_0)
-                 : "memory");
-    asm volatile("mov %[input], %%rsi"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_1)
-                 : "memory");
-    asm volatile("mov %[input], %%rdx"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_2)
-                 : "memory");
-    asm volatile("mov %[input], %%r10"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_3)
-                 : "memory");
-    asm volatile("mov %[input], %%r8"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_4)
-                 : "memory");
-    asm volatile("mov %[input], %%r9"
-                 : /* no output from call */
-                 : [input] "m"(result.values.arg_5)
-                 : "memory");
-
-    asm volatile("mov %[input], %%rcx"
-                 : /* no output from call */
-                 : [input] "m"(return_instruction_pointer)
-                 : "memory");
-    asm volatile("mov %[input], %%r11"
-                 : /* no output from call */
-                 : [input] "m"(rflags)
-                 : "memory");
-
-    // Additionally call leave, because x86 allocates stack space for the internal variables. If we do not clean up this
-    // newly created stack frame the syscall instruction that landed in this syscall_handler, will never return to the
-    // method that originally called it, because the RIP has not been restored from the previous stack frame.
-    asm volatile("leave\n"
-                 "sysretq");
-  }
-
-}  // namespace teachos::arch::context_switching::syscall