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#ifndef THREADS_LOADER_H
#define THREADS_LOADER_H
/* Constants fixed by the PC BIOS. */
#define LOADER_BASE 0x7c00 /* Physical address of loader's base. */
#define LOADER_END 0x7e00 /* Physical address of end of loader. */
/* Physical address of kernel base. */
#define LOADER_KERN_BASE 0x20000 /* 128 kB. */
/* Kernel virtual address at which all physical memory is mapped.
Must be aligned on a 4 MB boundary. */
#define LOADER_PHYS_BASE 0xc0000000 /* 3 GB. */
/* Important loader physical addresses. */
#define LOADER_SIG (LOADER_END - LOADER_SIG_LEN) /* 0xaa55 BIOS signature. */
#define LOADER_PARTS (LOADER_SIG - LOADER_PARTS_LEN) /* Partition table. */
#define LOADER_ARGS (LOADER_PARTS - LOADER_ARGS_LEN) /* Command-line args. */
#define LOADER_ARG_CNT (LOADER_ARGS - LOADER_ARG_CNT_LEN) /* Number of args. */
/* Sizes of loader data structures. */
#define LOADER_SIG_LEN 2
#define LOADER_PARTS_LEN 64
#define LOADER_ARGS_LEN 128
#define LOADER_ARG_CNT_LEN 4
/* GDT selectors defined by loader.
More selectors are defined by userprog/gdt.h. */
#define SEL_NULL 0x00 /* Null selector. */
#define SEL_KCSEG 0x08 /* Kernel code selector. */
#define SEL_KDSEG 0x10 /* Kernel data selector. */
#ifndef __ASSEMBLER__
#include <stdint.h>
/* Amount of physical memory, in 4 kB pages. */
extern uint32_t init_ram_pages;
#endif
#endif /* threads/loader.h */
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