60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
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/*
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* QEMU BIOS e820 routines
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*
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* Copyright (c) 2003-2004 Fabrice Bellard
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "qemu/osdep.h"
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#include "qemu/bswap.h"
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#include "e820_memory_layout.h"
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static size_t e820_entries;
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struct e820_table e820_reserve;
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struct e820_entry *e820_table;
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int e820_add_entry(uint64_t address, uint64_t length, uint32_t type)
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{
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int index = le32_to_cpu(e820_reserve.count);
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struct e820_entry *entry;
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if (type != E820_RAM) {
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/* old FW_CFG_E820_TABLE entry -- reservations only */
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if (index >= E820_NR_ENTRIES) {
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return -EBUSY;
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}
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entry = &e820_reserve.entry[index++];
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entry->address = cpu_to_le64(address);
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entry->length = cpu_to_le64(length);
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entry->type = cpu_to_le32(type);
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e820_reserve.count = cpu_to_le32(index);
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}
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/* new "etc/e820" file -- include ram too */
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e820_table = g_renew(struct e820_entry, e820_table, e820_entries + 1);
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e820_table[e820_entries].address = cpu_to_le64(address);
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e820_table[e820_entries].length = cpu_to_le64(length);
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e820_table[e820_entries].type = cpu_to_le32(type);
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e820_entries++;
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return e820_entries;
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}
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int e820_get_num_entries(void)
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{
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return e820_entries;
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}
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bool e820_get_entry(int idx, uint32_t type, uint64_t *address, uint64_t *length)
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{
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if (idx < e820_entries && e820_table[idx].type == cpu_to_le32(type)) {
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*address = le64_to_cpu(e820_table[idx].address);
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*length = le64_to_cpu(e820_table[idx].length);
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return true;
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}
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return false;
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}
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