From f199eae0154f354c37750c8cd3037f94dbfe70db Mon Sep 17 00:00:00 2001
From: Peter Mikkelsen <petermikkelsen10@gmail.com>
Date: Sat, 26 Jul 2025 16:03:00 +0200
Subject: Initial commit

---
 src/boot.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 src/boot.c

(limited to 'src/boot.c')

diff --git a/src/boot.c b/src/boot.c
new file mode 100644
index 0000000..4bbe771
--- /dev/null
+++ b/src/boot.c
@@ -0,0 +1,89 @@
+#include "aplos.h"
+
+#define LIMINE_API_REVISION 3
+#include "../external/limine/limine.h"
+
+#define LIMINE(sec) \
+	__attribute__((used, section(sec))) \
+	static volatile
+#define REQUEST LIMINE(".limine_requests")
+
+static void bootmain(void);
+
+REQUEST LIMINE_BASE_REVISION(3)
+
+REQUEST struct limine_framebuffer_request framebuffer_request = {
+	.id = LIMINE_FRAMEBUFFER_REQUEST,
+	.revision = 0
+};
+
+REQUEST struct limine_memmap_request memmap_request = {
+	.id = LIMINE_MEMMAP_REQUEST,
+	.revision = 0
+};
+
+REQUEST struct limine_paging_mode_request paging_request = {
+	.id = LIMINE_PAGING_MODE_REQUEST,
+	.revision = 1,
+	.mode = LIMINE_PAGING_MODE_X86_64_4LVL,
+	.min_mode = LIMINE_PAGING_MODE_X86_64_4LVL,
+	.max_mode = LIMINE_PAGING_MODE_X86_64_4LVL
+};
+
+REQUEST struct limine_mp_request mp_request = {
+	.id = LIMINE_MP_REQUEST,
+	.revision = 0
+};
+
+REQUEST struct limine_entry_point_request entry_point_request = {
+	.id = LIMINE_ENTRY_POINT_REQUEST,
+	.revision = 0,
+	.entry = bootmain
+};
+
+LIMINE(".limine_requests_start") LIMINE_REQUESTS_START_MARKER
+LIMINE(".limine_requests_end") LIMINE_REQUESTS_END_MARKER
+
+uint64_t
+cpu_count(void)
+{
+	return mp_request.response->cpu_count;
+}
+
+static void
+bootmain(void)
+{
+	struct boot_info info;
+
+	ASSERT(LIMINE_BASE_REVISION_SUPPORTED);
+	ASSERT(framebuffer_request.response);
+	ASSERT(memmap_request.response);
+	ASSERT(paging_request.response);
+	ASSERT(mp_request.response);
+
+	ASSERT(framebuffer_request.response->framebuffer_count >= 1);
+
+	struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
+
+	info.framebuffer.addr = framebuffer->address;
+	info.framebuffer.width = framebuffer->width;
+	info.framebuffer.height = framebuffer->height;
+	info.framebuffer.pitch = framebuffer->pitch;
+
+	struct memmap memmaps[memmap_request.response->entry_count];
+	info.memmap_count = 0;
+
+	struct memmap *m = memmaps;
+	for(uint64_t i = 0; i < memmap_request.response->entry_count; i++){
+		struct limine_memmap_entry *e = memmap_request.response->entries[i];
+		if(e->type != LIMINE_MEMMAP_USABLE)
+			continue;
+		m->start = e->base;
+		m->size = e->length;
+		m++;
+		info.memmap_count++;
+	}
+	info.memmaps = memmaps;
+
+	main(&info);
+}
-- 
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