60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <brados/printk.h>
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#include <brados/string.h>
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#include <video/vga.h>
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#include <multiboot.h>
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// Make sure we are using the right compiler
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#if defined(__linux__)
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#error "You are using the wrong compiler."
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#endif
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// Main kernel function
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void brados_main(uint32_t multiMagic, uint32_t multiAddr)
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{
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// Initialize VGA terminal
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struct vgastate term;
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term_init(&term);
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// Welcome message
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printk(&term, "Welcome to BRaDOS!\n");
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printk(&term, "written by L. Bradley LaBoon\n\n");
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// Get multiboot info
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if (multiMagic != 0x2BADB002) {
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printk(&term, "Error! Multiboot header not present. Quitting.\n");
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return;
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}
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struct multiboot_header *multiHead = (struct multiboot_header *) multiAddr;
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if ((multiHead->flags >> 6) % 2 != 1) {
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printk(&term, "Error! Memory map not available from bootloader. Quitting.\n");
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return;
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}
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struct multiboot_mmap *memmap = (struct multiboot_mmap *) multiHead->mmap_addr;
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// Print memory map
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printk(&term, "Memory map:\n");
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int numEntries = multiHead->mmap_length / sizeof(struct multiboot_mmap);
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uint64_t lastAddr = 0;
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for (int i = 0; i < numEntries; i++) {
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if (memmap[i].base_addr != lastAddr) {
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printk(&term, "%llx - %llx: Unknown\n", lastAddr, memmap[i].base_addr - 1);
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lastAddr = memmap[i].base_addr;
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}
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printk(&term, "%llx - %llx: ", memmap[i].base_addr, memmap[i].base_addr + memmap[i].length - 1);
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if (memmap[i].type == 1)
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printk(&term, "Available\n");
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else
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printk(&term, "Reserved\n");
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lastAddr = memmap[i].base_addr + memmap[i].length;
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}
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// Done
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term_writeStr(&term, "\nDone.");
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}
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