diff options
Diffstat (limited to 'arch/x86/include/asm/e820.h')
| -rw-r--r-- | arch/x86/include/asm/e820.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/arch/x86/include/asm/e820.h b/arch/x86/include/asm/e820.h new file mode 100644 index 0000000..d155ce9 --- /dev/null +++ b/arch/x86/include/asm/e820.h @@ -0,0 +1,155 @@ +#ifndef _ASM_X86_E820_H +#define _ASM_X86_E820_H +#define E820MAP 0x2d0 /* our map */ +#define E820MAX 128 /* number of entries in E820MAP */ + +/* + * Legacy E820 BIOS limits us to 128 (E820MAX) nodes due to the + * constrained space in the zeropage. If we have more nodes than + * that, and if we've booted off EFI firmware, then the EFI tables + * passed us from the EFI firmware can list more nodes. Size our + * internal memory map tables to have room for these additional + * nodes, based on up to three entries per node for which the + * kernel was built: MAX_NUMNODES == (1 << CONFIG_NODES_SHIFT), + * plus E820MAX, allowing space for the possible duplicate E820 + * entries that might need room in the same arrays, prior to the + * call to sanitize_e820_map() to remove duplicates. The allowance + * of three memory map entries per node is "enough" entries for + * the initial hardware platform motivating this mechanism to make + * use of additional EFI map entries. Future platforms may want + * to allow more than three entries per node or otherwise refine + * this size. + */ + +/* + * Odd: 'make headers_check' complains about numa.h if I try + * to collapse the next two #ifdef lines to a single line: + * #if defined(__KERNEL__) && defined(CONFIG_EFI) + */ +#ifdef __KERNEL__ +#ifdef CONFIG_EFI +#include <linux/numa.h> +#define E820_X_MAX (E820MAX + 3 * MAX_NUMNODES) +#else /* ! CONFIG_EFI */ +#define E820_X_MAX E820MAX +#endif +#else /* ! __KERNEL__ */ +#define E820_X_MAX E820MAX +#endif + +#define E820NR 0x1e8 /* # entries in E820MAP */ + +#define E820_RAM 1 +#define E820_RESERVED 2 +#define E820_ACPI 3 +#define E820_NVS 4 +#define E820_UNUSABLE 5 + +/* reserved RAM used by kernel itself */ +#define E820_RESERVED_KERN 128 + +#ifndef __ASSEMBLY__ +#include <linux/types.h> +struct e820entry { + __u64 addr; /* start of memory segment */ + __u64 size; /* size of memory segment */ + __u32 type; /* type of memory segment */ +} __attribute__((packed)); + +struct e820map { + __u32 nr_map; + struct e820entry map[E820_X_MAX]; +}; + +#define ISA_START_ADDRESS 0xa0000 +#define ISA_END_ADDRESS 0x100000 + +#define BIOS_BEGIN 0x000a0000 +#define BIOS_END 0x00100000 + +#ifdef __KERNEL__ +/* see comment in arch/x86/kernel/e820.c */ +extern struct e820map e820; +extern struct e820map e820_saved; + +extern unsigned long pci_mem_start; +extern int e820_any_mapped(u64 start, u64 end, unsigned type); +extern int e820_all_mapped(u64 start, u64 end, unsigned type); +extern void e820_add_region(u64 start, u64 size, int type); +extern void e820_print_map(char *who); +extern int +sanitize_e820_map(struct e820entry *biosmap, int max_nr_map, u32 *pnr_map); +extern u64 e820_update_range(u64 start, u64 size, unsigned old_type, + unsigned new_type); +extern u64 e820_remove_range(u64 start, u64 size, unsigned old_type, + int checktype); +extern void update_e820(void); +extern void e820_setup_gap(void); +extern int e820_search_gap(unsigned long *gapstart, unsigned long *gapsize, + unsigned long start_addr, unsigned long long end_addr); +struct setup_data; +extern void parse_e820_ext(struct setup_data *data, unsigned long pa_data); + +#if defined(CONFIG_X86_64) || \ + (defined(CONFIG_X86_32) && defined(CONFIG_HIBERNATION)) +extern void e820_mark_nosave_regions(unsigned long limit_pfn); +#else +static inline void e820_mark_nosave_regions(unsigned long limit_pfn) +{ +} +#endif + +#ifdef CONFIG_MEMTEST +extern void early_memtest(unsigned long start, unsigned long end); +#else +static inline void early_memtest(unsigned long start, unsigned long end) +{ +} +#endif + +extern unsigned long end_user_pfn; + +extern u64 find_e820_area(u64 start, u64 end, u64 size, u64 align); +extern u64 find_e820_area_size(u64 start, u64 *sizep, u64 align); +extern void reserve_early(u64 start, u64 end, char *name); +extern void reserve_early_overlap_ok(u64 start, u64 end, char *name); +extern void free_early(u64 start, u64 end); +extern void early_res_to_bootmem(u64 start, u64 end); +extern u64 early_reserve_e820(u64 startt, u64 sizet, u64 align); + +extern unsigned long e820_end_of_ram_pfn(void); +extern unsigned long e820_end_of_low_ram_pfn(void); +extern int e820_find_active_region(const struct e820entry *ei, + unsigned long start_pfn, + unsigned long last_pfn, + unsigned long *ei_startpfn, + unsigned long *ei_endpfn); +extern void e820_register_active_regions(int nid, unsigned long start_pfn, + unsigned long end_pfn); +extern u64 e820_hole_size(u64 start, u64 end); +extern void finish_e820_parsing(void); +extern void e820_reserve_resources(void); +extern void e820_reserve_resources_late(void); +extern void setup_memory_map(void); +extern char *default_machine_specific_memory_setup(void); + +/* + * Returns true iff the specified range [s,e) is completely contained inside + * the ISA region. + */ +/* +static inline bool is_ISA_range(u64 s, u64 e) +{ + return s >= ISA_START_ADDRESS && e <= ISA_END_ADDRESS; +} +*/ +#endif /* __KERNEL__ */ +#endif /* __ASSEMBLY__ */ + +#ifdef __KERNEL__ +/* #include <linux/ioport.h> */ + +#define HIGH_MEMORY (1024*1024) +#endif /* __KERNEL__ */ + +#endif /* _ASM_X86_E820_H */ |