brad/brados
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Prints initial memory map. Improvements to printk. Changed Makefile so that lgcc is linked after everything else.

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L. Bradley LaBoon
2014-02-11 11:57:26 -05:00
parent f23f3a8a8d
commit 9994b80c0d
3 changed files with 218 additions and 56 deletions
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41
kernel/brados.c
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@@ -19,24 +19,41 @@ void brados_main(uint32_t multiMagic, uint32_t multiAddr)
term_init(&term);
// Welcome message
term_writeStr(&term, "Welcome to BRaDOS!\n");
term_writeStr(&term, "written by L. Bradley LaBoon\n\n");
// VGA tests
//term_test(&term);
printk(&term, "Welcome to BRaDOS!\n");
printk(&term, "written by L. Bradley LaBoon\n\n");
// Get multiboot info
printk(&term, "Multiboot value: %x\n", multiMagic);
if (multiMagic != 0x2BADB002) {
term_writeStr(&term, "Error! Multiboot header not present. Quitting.\n");
printk(&term, "Error! Multiboot header not present. Quitting.\n");
return;
}
printk(&term, "Multiboot address: %x\n", multiAddr);
struct multiboot_header *multiHead = (struct multiboot_header *) multiAddr;
printk(&term, "Flags: %x\nMem Lower: %x\nMem Upper: %x\n", multiHead->flags, multiHead->mem_lower, multiHead->mem_upper);
char *bootName = (char *) multiHead->boot_loader_name;
printk(&term, "Boot loader: %s\n\n", bootName);
if ((multiHead->flags >> 6) % 2 != 1) {
printk(&term, "Error! Memory map not available from bootloader. Quitting.\n");
return;
}
struct multiboot_mmap *memmap = (struct multiboot_mmap *) multiHead->mmap_addr;
// Print memory map
printk(&term, "Memory map:\n");
int numEntries = multiHead->mmap_length / sizeof(struct multiboot_mmap);
uint64_t lastAddr = 0;
for (int i = 0; i < numEntries; i++) {
if (memmap[i].base_addr != lastAddr) {
printk(&term, "%llx - %llx: Unknown\n", lastAddr, memmap[i].base_addr - 1);
lastAddr = memmap[i].base_addr;
}
printk(&term, "%llx - %llx: ", memmap[i].base_addr, memmap[i].base_addr + memmap[i].length - 1);
if (memmap[i].type == 1)
printk(&term, "Available\n");
else
printk(&term, "Reserved\n");
lastAddr = memmap[i].base_addr + memmap[i].length;
}
// Done
term_writeStr(&term, "Done.");
term_writeStr(&term, "\nDone.");
}