define kprintf-size as a kernel:: atribute

Author: mazunki

src/include/kernel.hpp

@@ -26,6 +26,7 @@ namespace kernel {
   using namespace util;
   constexpr size_t default_max_mem = 2_GiB;
   constexpr uintptr_t page_shift   = 12;
+  constexpr size_t kprintf_max_size = 8192;
 
   struct State {
     bool running               = true;

src/kernel/multiboot.cpp

@@ -25,7 +25,7 @@
 
 template<class... Args>
 static inline void _kfmt(const char* prefix, fmt::format_string<Args...> fmtstr, Args&&... args) {
-  fmt::basic_memory_buffer<char, 512> buf;
+  fmt::basic_memory_buffer<char, kernel::kprintf_max_size> buf;
   fmt::format_to_n(std::back_inserter(buf), buf.capacity(), fmtstr, std::forward<Args>(args)...);
 
   kprintf("%s%.*s", prefix, (int)buf.size(), buf.data());

src/platform/x86_pc/serial1.cpp

@@ -1,3 +1,4 @@
+#include "kernel.hpp"
 #include <hw/serial.hpp>
 #include <stdarg.h>
 static const uint16_t port = 0x3F8; // Serial 1
@@ -44,7 +45,7 @@ void kprint(const char* c){
 
 extern "C" void kprintf(const char* format, ...)
 {
-  char buf[8192];
+  char buf[kernel::kprintf_max_size];
   va_list aptr;
   va_start(aptr, format);
   vsnprintf(buf, sizeof(buf), format, aptr);