6e9bcc796b
The map size counter passed into, and back out of, sanitize_e820_map(), was an eight bit type (char or u8), as derived from its origins in legacy BIOS E820 structures. This patch changes that type to an 'int', to allow this sanitize routine to also be used on larger maps (larger than the 256 count that fits in a char). The legacy BIOS E820 interface of course does not change; that remains at 8 bits for this count, holding up to E820MAX == 128 entries. But the kernel internals can handle more when those additional memory map entries are passed from the BIOS via EFI interfaces. Signed-off-by: Paul Jackson <pj@sgi.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
#ifndef __ASM_E820_H
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#define __ASM_E820_H
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#define E820MAP 0x2d0 /* our map */
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#define E820MAX 128 /* number of entries in E820MAP */
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/*
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* Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
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* constrained space in the zeropage. If we have more nodes than
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* that, and if we've booted off EFI firmware, then the EFI tables
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* passed us from the EFI firmware can list more nodes. Size our
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* internal memory map tables to have room for these additional
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* nodes, based on up to three entries per node for which the
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* kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
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* plus E820MAX, allowing space for the possible duplicate E820
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* entries that might need room in the same arrays, prior to the
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* call to sanitize_e820_map() to remove duplicates. The allowance
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* of three memory map entries per node is "enough" entries for
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* the initial hardware platform motivating this mechanism to make
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* use of additional EFI map entries. Future platforms may want
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* to allow more than three entries per node or otherwise refine
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* this size.
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*/
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/*
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* Odd: 'make headers_check' complains about numa.h if I try
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* to collapse the next two #ifdef lines to a single line:
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* #if defined(__KERNEL__) && defined(CONFIG_EFI)
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*/
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#ifdef __KERNEL__
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#ifdef CONFIG_EFI
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#include <linux/numa.h>
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#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
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#else /* ! CONFIG_EFI */
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#define E820_X_MAX E820MAX
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#endif
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#else /* ! __KERNEL__ */
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#define E820_X_MAX E820MAX
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#endif
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#define E820NR 0x1e8 /* # entries in E820MAP */
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#define E820_RAM 1
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#define E820_RESERVED 2
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#define E820_ACPI 3
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#define E820_NVS 4
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#ifndef __ASSEMBLY__
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struct e820entry {
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__u64 addr; /* start of memory segment */
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__u64 size; /* size of memory segment */
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__u32 type; /* type of memory segment */
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} __attribute__((packed));
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struct e820map {
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__u32 nr_map;
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struct e820entry map[E820_X_MAX];
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};
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extern struct e820map e820;
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extern int e820_any_mapped(u64 start, u64 end, unsigned type);
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extern int e820_all_mapped(u64 start, u64 end, unsigned type);
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extern void add_memory_region(u64 start, u64 size, int type);
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extern void e820_print_map(char *who);
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extern int
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sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, int *pnr_map);
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extern int copy_e820_map(struct e820entry *biosmap, int nr_map);
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extern u64 update_memory_range(u64 start, u64 size, unsigned old_type,
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unsigned new_type);
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extern void update_e820(void);
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extern void e820_setup_gap(void);
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#endif /* __ASSEMBLY__ */
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#define ISA_START_ADDRESS 0xa0000
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#define ISA_END_ADDRESS 0x100000
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#define BIOS_BEGIN 0x000a0000
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#define BIOS_END 0x00100000
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#ifdef __KERNEL__
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#ifdef CONFIG_X86_32
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# include "e820_32.h"
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#else
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# include "e820_64.h"
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#endif
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#endif /* __KERNEL__ */
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#endif /* __ASM_E820_H */
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