37ba7ab5e3
Make the kernel_alignment field adjustable; this allows us to set it to a large value (intended to be 16 MB to avoid ZONE_DMA contention, memory holes and other weirdness) while a smart bootloader can still force a loading at a lesser alignment if absolutely necessary. Also export pref_address (preferred loading address, corresponding to the link-time address) and init_size, the total amount of linear memory the kernel will require during initialization. [ Impact: allows better kernel placement, gives bootloader more info ] Signed-off-by: H. Peter Anvin <hpa@zytor.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#ifndef _ASM_X86_BOOT_H
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#define _ASM_X86_BOOT_H
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/* Internal svga startup constants */
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#define NORMAL_VGA 0xffff /* 80x25 mode */
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#define EXTENDED_VGA 0xfffe /* 80x50 mode */
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#define ASK_VGA 0xfffd /* ask for it at bootup */
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#ifdef __KERNEL__
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#include <asm/page_types.h>
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/* Physical address where kernel should be loaded. */
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#define LOAD_PHYSICAL_ADDR ((CONFIG_PHYSICAL_START \
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+ (CONFIG_PHYSICAL_ALIGN - 1)) \
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& ~(CONFIG_PHYSICAL_ALIGN - 1))
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/* Minimum kernel alignment, as a power of two */
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#ifdef CONFIG_x86_64
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#define MIN_KERNEL_ALIGN_LG2 PMD_SHIFT
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#else
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#define MIN_KERNEL_ALIGN_LG2 (PAGE_SHIFT+1)
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#endif
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#define MIN_KERNEL_ALIGN (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2)
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#if (CONFIG_PHYSICAL_ALIGN & (CONFIG_PHYSICAL_ALIGN-1)) || \
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(CONFIG_PHYSICAL_ALIGN < (_AC(1, UL) << MIN_KERNEL_ALIGN_LG2))
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#error "Invalid value for CONFIG_PHYSICAL_ALIGN"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#define BOOT_HEAP_SIZE 0x400000
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#else /* !CONFIG_KERNEL_BZIP2 */
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#ifdef CONFIG_X86_64
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#define BOOT_HEAP_SIZE 0x7000
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#else
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#define BOOT_HEAP_SIZE 0x4000
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#endif
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#endif /* !CONFIG_KERNEL_BZIP2 */
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#ifdef CONFIG_X86_64
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#define BOOT_STACK_SIZE 0x4000
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#else
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#define BOOT_STACK_SIZE 0x1000
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#endif
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_BOOT_H */
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