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39 lines
1.5 KiB
ArmAsm
39 lines
1.5 KiB
ArmAsm
%ifndef BOOT_GLOBALS_H
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%define BOOT_GLOBALS_H
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; Stage 1 base stack frame variable offsets / globals
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; (we use the same offsets once we copy the variables to the globals section)
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; -------------------------------------------------------------------------------------------------
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; The boot drive number given to us by the BIOS.
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%define BOOT_DRIVE 0x02
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; Boot drive geometry
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%define SECTORS_PER_TRACK 0x04
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%define N_HEADS 0x06
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; Starting LBA of the GPT partition entries array.
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%define GPT_ENTRIES_START_LBA 0x08
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; Number of GPT entries, saturated to 16 bits.
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%define GPT_N_ENTRIES_16 0x0a
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; Number of sectors to advance by once we've read every GPT entry in the current sector.
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%define GPT_SECTOR_STRIDE 0x0c
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; Number of bytes to advance by in the current sector once we've read a GPT entry.
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%define GPT_BYTE_STRIDE 0x0e
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; Number of GPT entries which can fit in a single sector.
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%define GPT_ENTRIES_PER_SECTOR 0x10
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%define GPT_CURRENT_ENTRY_IDX 0x12
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%define GPT_SECTOR_ENTRY_IDX 0x14
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%define GPT_SECTORS_LOADED 0x16
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%define GPT_CURRENT_LBA 0x18
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; 2-byte address of the partition GPT entry loaded into memory.
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%define STAGE_2_GPT_ENTRY_ADDR 0x1a
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; Stage 2 globals
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; -------------------------------------------------------------------------------------------------
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; 4-byte partition end LBA.
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%define LOADER_PART_END_LBA 0x1c
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; 2-byte stage 2 start LBA.
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%define STAGE_2_START_LBA 0x20
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; 2-byte stage 2 start LBA (inclusive).
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%define STAGE_2_END_LBA 0x22
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%endif
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