Initial commit

kernel/mem/mem.c

@@ -0,0 +1,88 @@
+//
+// Created by rick on 22-04-20.
+//
+
+#include <types.h>
+#include <kprint.h>
+#include <mem/mem.h>
+#include <libc/libc.h>
+
+char *msg_index = "Idx: ";
+char *msg_addr = "Address: ";
+char *msg_len = "Length:  ";
+char *msg_type = "Type:    ";
+char *msg_nl = "\n";
+
+typedef struct {
+    u64 address;
+    u64 length;
+#define MMAP_TYPE_UNDEFINED              0
+#define MMAP_TYPE_AVAILABLE              1
+#define MMAP_TYPE_RESERVED               2
+#define MMAP_TYPE_ACPI_RECLAIMABLE       3
+#define MMAP_TYPE_NVS                    4
+#define MMAP_TYPE_BADRAM                 5
+    u32 type;
+} __attribute((packed)) mmap_entry;
+
+char *msg_lu = "0123456789ABCDEF";
+
+mmap_entry memmap[16] = {
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+        {0, 0, 0},
+};
+
+void init_mmap(struct multiboot_mmap_entry *entries, u32 count) {
+    for (u32 i = 0; i < count; ++i) {
+        memmap[i].address = entries[i].addr;
+        memmap[i].length = entries[i].len;
+        memmap[i].type = entries[i].type;
+    }
+}
+
+void print_hex_u64(u64 input) {
+    char msg[18] = "0x0000000000000000";
+    for (int i = 0; i < 16; ++i) {
+        int val = input >> (4 * i) & 0xF;
+        msg[17 - i] = msg_lu[val];
+    }
+    kprint(msg);
+}
+
+void print_mmap_info() {
+    for (int i = 0; i < 16; ++i) {
+        if (memmap[i].type == 0) {
+            break;
+        }
+        char *tmp_str = "  ";
+        kprint(msg_index);
+        itoa(i, tmp_str);
+        kprint(tmp_str);
+        kprint(msg_nl);
+        kprint(msg_addr);
+        print_hex_u64(memmap[i].address);
+        kprint(msg_nl);
+        kprint(msg_len);
+        print_hex_u64(memmap[i].length);
+        kprint(msg_nl);
+        kprint(msg_type);
+        itoa(memmap[i].type, tmp_str);
+        kprint(tmp_str);
+        kprint(msg_nl);
+        kprint(msg_nl);
+    }
+}

kernel/mem/mem.h

@@ -0,0 +1,14 @@
+//
+// Created by rick on 22-04-20.
+//
+
+#ifndef NEW_KERNEL_MEM_H
+#define NEW_KERNEL_MEM_H
+
+#include <multiboot.h>
+
+void init_mmap(struct multiboot_mmap_entry *entries, u32 count);
+
+void print_mmap_info();
+
+#endif //NEW_KERNEL_MEM_H