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e15db02362
The existing mechanism is pretty painful as it requires manual calculations for anything but a trivial setup. Add a new API for adding e820 entries. Signed-off-by: Simon Glass <sjg@chromium.org>
138 lines
3.1 KiB
C
138 lines
3.1 KiB
C
#ifndef _ASM_X86_E820_H
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#define _ASM_X86_E820_H
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#define E820MAX 128 /* number of entries in E820MAP */
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#ifdef __ASSEMBLY__
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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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#define E820_UNUSABLE 5
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#define E820_COUNT 6 /* Number of types */
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#else
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#include <linux/types.h>
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/* Available e820 memory-region types */
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enum e820_type {
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E820_RAM = 1,
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E820_RESERVED,
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E820_ACPI,
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E820_NVS,
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E820_UNUSABLE,
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E820_COUNT,
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};
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struct e820_entry {
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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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#define ISA_START_ADDRESS 0xa0000
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#define ISA_END_ADDRESS 0x100000
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/**
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* Context to use for e820_add()
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*
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* @entries: Table being filled in
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* @addr: Current address we are up to
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* @count: Number of entries added to @entries so far
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* @max_entries: Maximum number of entries allowed
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*/
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struct e820_ctx {
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struct e820_entry *entries;
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u64 addr;
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int count;
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int max_entries;
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};
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/**
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* e820_init() - Start setting up an e820 table
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*
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* @ctx: Context to set up
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* @entries: Place to put entries
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* @max_entries: Maximum size of @entries
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*/
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void e820_init(struct e820_ctx *ctx, struct e820_entry *entries,
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int max_entries);
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/**
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* e820_add() - Add an entry to the table
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*
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* @ctx: Context
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* @type: Type of entry
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* @addr: Start address of entry
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* @size Size of entry
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*/
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void e820_add(struct e820_ctx *ctx, enum e820_type type, u64 addr, u64 size);
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/**
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* e820_to_addr() - Add an entry that covers the space up to a given address
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*
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* @ctx: Context
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* @type: Type of entry
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* @end_addr: Address where the entry should finish
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*/
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void e820_to_addr(struct e820_ctx *ctx, enum e820_type type, u64 end_addr);
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/**
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* e820_next() - Add an entry that carries on from the last one
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*
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* @ctx: Context
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* @type: Type of entry
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* @size Size of entry
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*/
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void e820_next(struct e820_ctx *ctx, enum e820_type type, u64 size);
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/**
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* e820_finish() - Finish the table
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*
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* Checks the table is not too large, panics if so
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*
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* @ctx: Context
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* Returns: Number of entries
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*/
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int e820_finish(struct e820_ctx *ctx);
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/* Implementation-defined function to install an e820 map */
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unsigned int install_e820_map(unsigned int max_entries,
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struct e820_entry *);
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/**
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* e820_dump() - Dump the e820 table
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*
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* @entries: Pointer to start of table
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* @count: Number of entries in the table
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*/
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void e820_dump(struct e820_entry *entries, uint count);
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/**
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* cb_install_e820_map() - Install e820 map provided by coreboot sysinfo
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*
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* This should be used when booting from coreboot, since in that case the
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* memory areas are provided by coreboot in its sysinfo.
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*
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* @max_entries: Maximum number of entries to write
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* @entries: Place to put entires
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* Return: number of entries written
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*/
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unsigned int cb_install_e820_map(unsigned int max_entries,
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struct e820_entry *entries);
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/**
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* e820_dump() - Dump an e820 table
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*
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* @entries: Pointer to first entry
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* @count: Number of entries in the table
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*/
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void e820_dump(struct e820_entry *entries, uint count);
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_E820_H */
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