LCOV - code coverage report
Current view: top level - arch/x86/include/asm - e820.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 1 1 100.0 %
Date: 2017-01-25 Functions: 0 0 -

          Line data    Source code
       1             : #ifndef _ASM_X86_E820_H
       2             : #define _ASM_X86_E820_H
       3             : #define E820MAP 0x2d0           /* our map */
       4             : #define E820MAX 128             /* number of entries in E820MAP */
       5             : 
       6             : /*
       7             :  * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the
       8             :  * constrained space in the zeropage.  If we have more nodes than
       9             :  * that, and if we've booted off EFI firmware, then the EFI tables
      10             :  * passed us from the EFI firmware can list more nodes.  Size our
      11             :  * internal memory map tables to have room for these additional
      12             :  * nodes, based on up to three entries per node for which the
      13             :  * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT),
      14             :  * plus E820MAX, allowing space for the possible duplicate E820
      15             :  * entries that might need room in the same arrays, prior to the
      16             :  * call to sanitize_e820_map() to remove duplicates.  The allowance
      17             :  * of three memory map entries per node is "enough" entries for
      18             :  * the initial hardware platform motivating this mechanism to make
      19             :  * use of additional EFI map entries.  Future platforms may want
      20             :  * to allow more than three entries per node or otherwise refine
      21             :  * this size.
      22             :  */
      23             : 
      24             : /*
      25             :  * Odd: 'make headers_check' complains about numa.h if I try
      26             :  * to collapse the next two #ifdef lines to a single line:
      27             :  *      #if defined(__KERNEL__) && defined(CONFIG_EFI)
      28             :  */
      29             : #ifdef __KERNEL__
      30             : #ifdef CONFIG_EFI
      31             : #include <linux/numa.h>
      32             : #define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES)
      33             : #else   /* ! CONFIG_EFI */
      34             : #define E820_X_MAX E820MAX
      35             : #endif
      36             : #else   /* ! __KERNEL__ */
      37             : #define E820_X_MAX E820MAX
      38             : #endif
      39             : 
      40             : #define E820NR  0x1e8           /* # entries in E820MAP */
      41             : 
      42             : #define E820_RAM        1
      43             : #define E820_RESERVED   2
      44             : #define E820_ACPI       3
      45             : #define E820_NVS        4
      46             : #define E820_UNUSABLE   5
      47             : 
      48             : /* reserved RAM used by kernel itself */
      49             : #define E820_RESERVED_KERN        128
      50             : 
      51             : #ifndef __ASSEMBLY__
      52             : #include <linux/types.h>
      53             : struct e820entry {
      54             :         __u64 addr;     /* start of memory segment */
      55             :         __u64 size;     /* size of memory segment */
      56             :         __u32 type;     /* type of memory segment */
      57             : } __attribute__((packed));
      58             : 
      59             : struct e820map {
      60             :         __u32 nr_map;
      61             :         struct e820entry map[E820_X_MAX];
      62             : };
      63             : 
      64             : #define ISA_START_ADDRESS       0xa0000
      65             : #define ISA_END_ADDRESS         0x100000
      66             : 
      67             : #define BIOS_BEGIN              0x000a0000
      68             : #define BIOS_END                0x00100000
      69             : 
      70             : #ifdef __KERNEL__
      71             : /* see comment in arch/x86/kernel/e820.c */
      72             : extern struct e820map e820;
      73             : extern struct e820map e820_saved;
      74             : 
      75             : extern unsigned long pci_mem_start;
      76             : extern int e820_any_mapped(u64 start, u64 end, unsigned type);
      77             : extern int e820_all_mapped(u64 start, u64 end, unsigned type);
      78             : extern void e820_add_region(u64 start, u64 size, int type);
      79             : extern void e820_print_map(char *who);
      80             : extern int
      81             : sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map);
      82             : extern u64 e820_update_range(u64 start, u64 size, unsigned old_type,
      83             :                                unsigned new_type);
      84             : extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type,
      85             :                              int checktype);
      86             : extern void update_e820(void);
      87             : extern void e820_setup_gap(void);
      88             : extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize,
      89             :                         unsigned long start_addr, unsigned long long end_addr);
      90             : struct setup_data;
      91             : extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data);
      92             : 
      93             : #if defined(CONFIG_X86_64) || \
      94             :         (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION))
      95             : extern void e820_mark_nosave_regions(unsigned long limit_pfn);
      96             : #else
      97             : static inline void e820_mark_nosave_regions(unsigned long limit_pfn)
      98             : {
      99             : }
     100             : #endif
     101             : 
     102             : #ifdef CONFIG_MEMTEST
     103             : extern void early_memtest(unsigned long start, unsigned long end);
     104             : #else
     105             : static inline void early_memtest(unsigned long start, unsigned long end)
     106             : {
     107             : }
     108             : #endif
     109             : 
     110             : extern unsigned long end_user_pfn;
     111             : 
     112             : extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align);
     113             : extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align);
     114             : extern void reserve_early(u64 start, u64 end, char *name);
     115             : extern void reserve_early_overlap_ok(u64 start, u64 end, char *name);
     116             : extern void free_early(u64 start, u64 end);
     117             : extern void early_res_to_bootmem(u64 start, u64 end);
     118             : extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align);
     119             : 
     120             : extern unsigned long e820_end_of_ram_pfn(void);
     121             : extern unsigned long e820_end_of_low_ram_pfn(void);
     122             : extern int e820_find_active_region(const struct e820entry *ei,
     123             :                                   unsigned long start_pfn,
     124             :                                   unsigned long last_pfn,
     125             :                                   unsigned long *ei_startpfn,
     126             :                                   unsigned long *ei_endpfn);
     127             : extern void e820_register_active_regions(int nid, unsigned long start_pfn,
     128             :                                          unsigned long end_pfn);
     129             : extern u64 e820_hole_size(u64 start, u64 end);
     130             : extern void finish_e820_parsing(void);
     131             : extern void e820_reserve_resources(void);
     132             : extern void e820_reserve_resources_late(void);
     133             : extern void setup_memory_map(void);
     134             : extern char *default_machine_specific_memory_setup(void);
     135             : 
     136             : /*
     137             :  * Returns true iff the specified range [s,e) is completely contained inside
     138             :  * the ISA region.
     139             :  */
     140             : static inline bool is_ISA_range(u64 s, u64 e)
     141             : {
     142             :         return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS;
     143             : }
     144           1 : 
     145             : #endif /* __KERNEL__ */
     146             : #endif /* __ASSEMBLY__ */
     147             : 
     148             : #ifdef __KERNEL__
     149             : #include <linux/ioport.h>
     150             : 
     151             : #define HIGH_MEMORY     (1024*1024)
     152             : #endif /* __KERNEL__ */
     153             : 
     154             : #endif /* _ASM_X86_E820_H */

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