From 63fd7ce362c7f1d59365045f19cf1ca87ffe2db9 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Mon, 15 Aug 2022 23:03:18 +0200
Subject: kernel: combine kmain_early and kmain

---
 src/kernel/mem/alloc.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

(limited to 'src/kernel/mem/alloc.c')

diff --git a/src/kernel/mem/alloc.c b/src/kernel/mem/alloc.c
index 7270021..3ed49d6 100644
--- a/src/kernel/mem/alloc.c
+++ b/src/kernel/mem/alloc.c
@@ -36,29 +36,30 @@ static void bitmap_set(size_t i, bool v) {
 	else   pbitmap[b] &= ~m;
 }
 
-static void bitmap_mark(void *start, size_t len) {
+void mem_init(void *memtop) {
+	kprintf("memory   %8x -> %8x\n", &_bss_end, memtop);
+	size_t pageamt = ((uintptr_t)memtop - (uintptr_t)pbitmap_start) / PAGE_SIZE;
+	pbitmap_len = pageamt / 8;
+	memset(pbitmap, 0, pbitmap_len);
+	mem_reserve(pbitmap, pbitmap_len);
+}
+
+void mem_reserve(void *addr, size_t len) {
+	kprintf("reserved %8x -> %8x\n", addr, addr + len);
+
 	/* align to the previous page */
-	size_t off = (uintptr_t)start & PAGE_MASK;
-	start -= off;
+	size_t off = (uintptr_t)addr & PAGE_MASK;
+	addr -= off;
 	len += off;
-	size_t first = ((uintptr_t)start - (uintptr_t)pbitmap_start) / PAGE_SIZE;
+	size_t first = ((uintptr_t)addr - (uintptr_t)pbitmap_start) / PAGE_SIZE;
 	for (size_t i = 0; i * PAGE_SIZE < len; i++) {
 		if (first + i >= pbitmap_len) break;
+		if (bitmap_get(first + i))
+			panic_invalid_state();
 		bitmap_set(first + i, true);
 	}
 }
 
-void mem_init(struct kmain_info *info) {
-	size_t pageamt = ((uintptr_t)info->memtop - (uintptr_t)pbitmap_start) / PAGE_SIZE;
-	pbitmap_len = pageamt / 8;
-	memset(pbitmap, 0, pbitmap_len);
-	bitmap_mark(pbitmap, pbitmap_len);
-
-	// TODO make boot.c handle this instead
-	bitmap_mark(info->init.at, info->init.size);
-	bitmap_mark(info->fb.at,   info->fb.size);
-}
-
 void mem_debugprint(void) {
 	size_t total = 0;
 	kprintf("current kmallocs:\n");
-- 
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