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/*
* CMOS
* Copyright (C) 2025 Raghuram Subramani <raghus2247@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdint.h>
#include <common.h>
#include <kernel/halt.h>
#include <libk/stdio.h>
#include <mm/multiboot.h>
ALWAYS_INLINE static char *
memory_map_fetch_type(multiboot_memory_map_t *mmap)
{
switch (mmap->type) {
case MULTIBOOT_MEMORY_AVAILABLE:
return "AVAILABLE";
case MULTIBOOT_MEMORY_RESERVED:
return "RESERVED";
case MULTIBOOT_MEMORY_ACPI_RECLAIMABLE:
return "ACPI_RECLAIMABLE";
case MULTIBOOT_MEMORY_NVS:
return "NVS";
case MULTIBOOT_MEMORY_BADRAM:
return "BADRAM";
default:
return "UNKNOWN";
}
}
void
memory_map_load(multiboot_info_t *multiboot_info)
{
printk("mm", "Loading Memory Map:");
/* https://www.gnu.org/software/grub/manual/multiboot/multiboot.html:
*
* If bit 6 in the ‘flags’ word is set, then the ‘mmap_*’ fields are
* valid, and indicate the address and length of a buffer containing a
* memory map of the machine provided by the BIOS. ‘mmap_addr’ is the
* address, and ‘mmap_length’ is the total size of the buffer. The buffer
* consists of one or more of the following size/structure pairs (‘size’
* is really used for skipping to the next pair): */
if (!(multiboot_info->flags & MULTIBOOT_INFO_ELF_SHDR)) {
printk("mm", "Invalid memory map!");
halt();
}
for (uint32_t i = 0; i < multiboot_info->mmap_length;
i += sizeof(multiboot_memory_map_t)) {
multiboot_memory_map_t *mmap
= (multiboot_memory_map_t *) (multiboot_info->mmap_addr + i);
printk("mm",
"start: 0x%x | length: 0x%x | size: 0x%x | type: %s",
mmap->addr_low,
mmap->len_low,
mmap->size,
memory_map_fetch_type(mmap));
}
}
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