1 #ifndef HEADER_LOADER_H
2 #define HEADER_LOADER_H
4 /* Constants fixed by the PC BIOS. */
5 #define LOADER_BASE 0x7c00 /* Physical address of loader's base. */
6 #define LOADER_SIZE 0x200 /* Loader size in bytes (one disk sector). */
8 /* Physical address of kernel base. */
9 #define LOADER_KERN_BASE 0x100000 /* 1 MB. */
11 /* The loader maps 4 MB of the start of physical memory to this
12 virtual base address. Later, the kernel adds the rest of
13 physical memory to the mapping.
14 This must be aligned on a 4 MB boundary. */
15 #define LOADER_PHYS_BASE 0xb0000000 /* 3 GB. */
17 /* Offsets within the loader. */
18 #define LOADER_BIOS_SIG (LOADER_SIZE - 2) /* aa55 BIOS signature. */
19 #define LOADER_CMD_LINE (LOADER_BIOS_SIG - 0x80) /* Kernel command line. */
20 #define LOADER_RAM_PAGES (LOADER_CMD_LINE - 4) /* # of pages of RAM. */