68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* memory.h - describe the memory map */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_MEMORY_MACHINE_HEADER
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#define GRUB_MEMORY_MACHINE_HEADER 1
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/* The scratch buffer used in real mode code. */
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#define GRUB_MEMORY_MACHINE_SCRATCH_ADDR 0x68000
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#define GRUB_MEMORY_MACHINE_SCRATCH_SEG (GRUB_MEMORY_MACHINE_SCRATCH_ADDR >> 4)
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#define GRUB_MEMORY_MACHINE_SCRATCH_SIZE 0x10000
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/* The real mode stack. */
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#define GRUB_MEMORY_MACHINE_REAL_STACK (0x2000 - 0x10)
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/* The size of the protect mode stack. */
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#define GRUB_MEMORY_MACHINE_PROT_STACK_SIZE 0x8000
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/* The protected mode stack. */
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#define GRUB_MEMORY_MACHINE_PROT_STACK \
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(GRUB_MEMORY_MACHINE_SCRATCH_ADDR + GRUB_MEMORY_MACHINE_SCRATCH_SIZE \
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+ GRUB_MEMORY_MACHINE_PROT_STACK_SIZE - 0x10)
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/* The memory area where GRUB uses its own purpose. This part is not added
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into free memory for dynamic allocations. */
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#define GRUB_MEMORY_MACHINE_RESERVED_START \
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GRUB_MEMORY_MACHINE_SCRATCH_ADDR
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#define GRUB_MEMORY_MACHINE_RESERVED_END \
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(GRUB_MEMORY_MACHINE_PROT_STACK + 0x10)
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/* The address of a partition table passed to another boot loader. */
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#define GRUB_MEMORY_MACHINE_PART_TABLE_ADDR 0x7be
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/* The address where another boot loader is loaded. */
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#define GRUB_MEMORY_MACHINE_BOOT_LOADER_ADDR 0x7c00
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/* The flag for protected mode. */
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#define GRUB_MEMORY_MACHINE_CR0_PE_ON 0x1
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/* The code segment of the protected mode. */
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#define GRUB_MEMORY_MACHINE_PROT_MODE_CSEG 0x8
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/* The data segment of the protected mode. */
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#define GRUB_MEMORY_MACHINE_PROT_MODE_DSEG 0x10
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/* The code segment of the pseudo real mode. */
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#define GRUB_MEMORY_MACHINE_PSEUDO_REAL_CSEG 0x18
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/* The data segment of the pseudo real mode. */
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#define GRUB_MEMORY_MACHINE_PSEUDO_REAL_DSEG 0x20
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#endif /* ! GRUB_MEMORY_MACHINE_HEADER */
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