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https://github.com/edk2-porting/linux-next.git
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093af8d7f0
when MTRRs are not covering the whole e820 table, we need to trim the RAM and need to update e820. reuse some code on 64-bit as well. here need to add early_get_cap and use it in early_cpu_detect, and move mtrr_bp_init early. The code successfully trimmed the memory map on Justin's system: from: [ 0.000000] BIOS-e820: 0000000100000000 - 000000022c000000 (usable) to: [ 0.000000] modified: 0000000100000000 - 0000000228000000 (usable) [ 0.000000] modified: 0000000228000000 - 000000022c000000 (reserved) According to Justin it makes quite a difference: | When I boot the box without any trimming it acts like a 286 or 386, | takes about 10 minutes to boot (using raptor disks). Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Tested-by: Justin Piszcz <jpiszcz@lucidpixels.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/*
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* structures and definitions for the int 15, ax=e820 memory map
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* scheme.
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*
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* In a nutshell, arch/i386/boot/setup.S populates a scratch table
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* in the empty_zero_block that contains a list of usable address/size
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* duples. In arch/i386/kernel/setup.c, this information is
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* transferred into the e820map, and in arch/i386/mm/init.c, that
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* new information is used to mark pages reserved or not.
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*
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*/
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#ifndef __E820_HEADER
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#define __E820_HEADER
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#include <linux/ioport.h>
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#define HIGH_MEMORY (1024*1024)
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#ifndef __ASSEMBLY__
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extern struct e820map e820;
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extern void update_e820(void);
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extern int e820_all_mapped(unsigned long start, unsigned long end,
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unsigned type);
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extern int e820_any_mapped(u64 start, u64 end, unsigned type);
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extern void find_max_pfn(void);
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extern void register_bootmem_low_pages(unsigned long max_low_pfn);
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extern void add_memory_region(unsigned long long start,
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unsigned long long size, int type);
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extern void e820_register_memory(void);
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extern void limit_regions(unsigned long long size);
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extern void print_memory_map(char *who);
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extern void init_iomem_resources(struct resource *code_resource,
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struct resource *data_resource,
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struct resource *bss_resource);
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#if defined(CONFIG_PM) && defined(CONFIG_HIBERNATION)
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extern void e820_mark_nosave_regions(void);
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#else
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static inline void e820_mark_nosave_regions(void)
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{
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}
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#endif
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#endif/*!__ASSEMBLY__*/
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#endif/*__E820_HEADER*/
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