Create kernel build infrastructure

6 files changed, 137 insertions, 0 deletions

diff --git a/kernel/cxx/constructors.cxx b/kernel/cxx/constructors.cxx
new file mode 100644
index 0000000..8c21453
--- /dev/null
+++ b/kernel/cxx/constructors.cxx
@@ -0,0 +1,18 @@
+extern void (*_ctors_start[0])(void), (*_ctors_end[0])(void);
+extern void (*_dtors_start[0])(void), (*_dtors_end[0])(void);
+
+void init (void)
+{
+    for (void (**ctor)(void) = _ctors_start; ctor != _ctors_end; ctor++)
+    {
+        (*ctor)();
+    }
+}
+
+void fini (void)
+{
+    for (void (**dtor)(void) = _dtors_start; dtor != _dtors_end; dtor++)
+    {
+        (*dtor)();
+    }
+}
diff --git a/kernel/cxx/gcc_required_functions.cxx b/kernel/cxx/gcc_required_functions.cxx
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/kernel/cxx/gcc_required_functions.cxx
@@ -0,0 +1 @@
+
diff --git a/kernel/cxx/icxxabi.cxx b/kernel/cxx/icxxabi.cxx
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/kernel/cxx/icxxabi.cxx
diff --git a/kernel/cxx/icxxabi.h b/kernel/cxx/icxxabi.h
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/kernel/cxx/icxxabi.h
diff --git a/kernel/entry.cxx b/kernel/entry.cxx
new file mode 100644
index 0000000..b5bc210
--- /dev/null
+++ b/kernel/entry.cxx
@@ -0,0 +1,49 @@
+#include "../vendor/limine/limine.h"
+#include <cstdint>
+
+__attribute__ ((used, section(".requests")))
+static volatile LIMINE_BASE_REVISION(3);
+
+__attribute__ ((used, section(".requests")))
+static volatile limine_framebuffer_request framebuffer_request = {
+    .id = LIMINE_FRAMEBUFFER_REQUEST,
+    .revision = 0,
+    .response = nullptr
+};
+
+__attribute__ ((used, section(".requests_start")))
+static volatile LIMINE_REQUESTS_START_MARKER;
+
+__attribute__ ((used, section(".requests_end")))
+static volatile LIMINE_REQUESTS_END_MARKER;
+
+static void hcf (void)
+{
+    for (;;)
+    {
+        asm ("hlt");
+    }
+}
+
+void init (void);
+
+extern "C" void _launch (void);
+void _launch (void)
+{
+    if (LIMINE_BASE_REVISION_SUPPORTED == false)
+    {
+        hcf();
+    }
+
+    struct limine_framebuffer *fb = framebuffer_request.response->framebuffers[0];
+    for (std::size_t i = 0; i < (fb->width - 1) * (fb->height - 1); i += 2)
+    {
+        volatile std::uint32_t *fbptr = static_cast<std::uint32_t *>(fb->address);
+        fbptr[i] = 0xffffff;
+    }
+
+    // Global C++ constructors
+    init();
+
+    hcf();
+}
diff --git a/kernel/ldscript b/kernel/ldscript
new file mode 100644
index 0000000..2f1e1f4
--- /dev/null
+++ b/kernel/ldscript
@@ -0,0 +1,69 @@
+ENTRY(_launch)
+
+PHDRS
+{
+    text        PT_LOAD;
+    rodata      PT_LOAD;
+    data        PT_LOAD;
+    eh_frame    PT_LOAD;
+    dynamic     PT_LOAD;
+}
+
+SECTIONS
+{
+    /* Load in upper, you know the drill */
+    . = 0xFFFFFFFF80000000;
+
+    _kernel_start = .;
+
+    .text : {
+        *(.text .text.*)
+    } :text
+
+    . += CONSTANT(MAXPAGESIZE);
+
+    .rodata : {
+        *(.rodata, .rodata.*)
+        *(.srodata, .srodata.*)
+    } :rodata
+
+    .init_array : {
+        _ctors_start = .;
+        KEEP(*(SORT(.init_array.*)))
+        KEEP(*(.init_array))
+        _ctors_end = .;        
+    } :rodata
+
+    .fini_array : {
+        _dtors_start = .;
+        KEEP(*(SORT(.fini_array)))
+        KEEP(*(.fini_array))
+        _dtors_end = .;
+    } :rodata
+
+    . += CONSTANT(MAXPAGESIZE);
+
+    .data : {
+        *(.data .data.*)
+        *(.sdata .sdata.*)
+
+        KEEP(*(.requests_start))
+        KEEP(*(.requests))
+        KEEP(*(.requests_end))
+    } :data
+
+    .dynamic : {
+        *(.dynamic)
+    } :data :dynamic
+
+    .bss : {
+        *(.bss .bss.*)
+        *(.sbss .sbss.*)
+        *(COMMON)
+    } :data
+
+    /DISCARD/ : {
+        *(.eh_frame*)
+        *(.note .note.*)
+    }
+}