Get memory map from BIOS E820

[nameless-os.git] / kernel / kernel.c

diff --git a/kernel/kernel.c b/kernel/kernel.c
index 060051c25782f3317f426f0ea44362e420a98b80..0aa8fc260ddfd604789fa6e2ff0050cb2f4a8970 100644 (file)
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -11,13 +11,38 @@ extern void pf_handler(struct fault_frame *frame);
 static struct idt_descriptor idt[256] __attribute__((aligned(0x10)));
 static struct idtr idtr __attribute__((aligned(0x10)));
 
+struct e820_map {
+       uint64_t base;
+       uint64_t length;
+       uint32_t type;
+       uint32_t attrib;
+};
 
-void kmain(void)
+void print_e820(struct e820_map *mmap, int mmap_size)
+{
+       kprint("       Base       |      Length      |   Type   |  Attrib  |\n", 0);
+       kprint("------------------------------------------------------------\n", 0);
+       for (int i=0; i<mmap_size; i++) {
+               kprintq(mmap[i].base);
+               kprintc('|', 0);
+               kprintq(mmap[i].length);
+               kprintc('|', 0);
+               kprintd(mmap[i].type);
+               kprintc('|', 0);
+               kprintd(mmap[i].attrib);
+               kprintc('|', 0);
+               kprintc('\n', 0);
+       }
+}
+
+void kmain(struct e820_map *mmap, int mmap_size)
 {
        screen_clear();
        kprint("Welcome to Nameless OS!\nRunning revision: ", 0);
        kprint(GIT_COMMIT, 0);
        kprint("\n", 0);
+       kprint("BIOS memory map:\n", 0);
+       print_e820(mmap, mmap_size);
        kprint("Preparing IDT...\n", 0);
        idt_set_descriptor(idt, 8, 0x8, (uint32_t) double_fault, IDT_INTERRUPT_GATE, 0x0);
        idt_set_descriptor(idt, 14, 0x8, (uint32_t) pf_handler, IDT_INTERRUPT_GATE, 0x0);