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