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/*
* Copyright (c) 2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Hyra nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPKERNE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LKERNS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* PKERNSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <kern/panic.h>
#include <os/trace.h>
#include <vm/phys.h>
#include <lib/limine.h>
#define dtrace(fmt, ...) trace("phys: " fmt, ##__VA_ARGS__)
#define MEM_GIB 0x40000000
#define MEM_MIB 0x100000
/* Aliases for portability */
#define MEM_USABLE (LIMINE_MEMMAP_USABLE)
#define MEM_RESERVED (LIMINE_MEMMAP_RESERVED)
#define MEM_ACPI_RECLAIMABLE (LIMINE_MEMMAP_ACPI_RECLAIMABLE)
#define MEM_ACPI_NVS (LIMINE_MEMMAP_ACPI_NVS)
#define MEM_BAD (LIMINE_MEMMAP_BAD_MEMORY)
#define MEM_BOOTLOADER (LIMINE_MEMMAP_BOOTLOADER_RECLAIMABLE)
#define MEM_KERNEL (LIMINE_MEMMAP_KERNEL_AND_MODULES)
#define MEM_FRAMEBUFFER (LIMINE_MEMMAP_FRAMEBUFFER)
#define MEM_ENTRY(INDEX) (memmap_resp->entries[(INDEX)])
#define MEM_ENTRY_COUNT (memmap_resp->entry_count)
typedef struct limine_memmap_entry mementry_t;
/* Memory statistics */
static size_t total_mem = 0;
static size_t free_mem = 0;
static size_t reserved_mem = 0;
static uintptr_t highest_usable = 0;
/*
* Request a memor map from the bootloader
*/
static struct limine_memmap_response *memmap_resp;
static volatile struct limine_memmap_request memmap_req = {
.id = LIMINE_MEMMAP_REQUEST,
.revision = 0
};
/*
* Print memory size related stats
*/
static void
vm_printstat(const char *name, size_t size)
{
if (size >= MEM_GIB) {
dtrace("%s %d GiB\n", name, size / MEM_GIB);
} else {
dtrace("%s %d MiB\n", name, size / MEM_MIB);
}
}
/*
* Probe for usable memory
*/
static void
vm_probe(void)
{
mementry_t *entry;
for (size_t i = 0; i < MEM_ENTRY_COUNT; ++i) {
entry = MEM_ENTRY(i);
if (entry->type != MEM_USABLE) {
total_mem += entry->length;
reserved_mem += entry->length;
continue;
}
total_mem += entry->length;
free_mem += entry->length;
if ((entry->base + entry->length) > highest_usable) {
highest_usable = entry->base + entry->length;
}
}
vm_printstat("memory installed", total_mem);
vm_printstat("memory usable", free_mem);
vm_printstat("memory reserved", reserved_mem);
dtrace("usable top @ %p\n", highest_usable);
}
void
vm_phys_init(void)
{
memmap_resp = memmap_req.response;
if (__unlikely(memmap_resp == NULL)) {
panic("vm: unable to get memory map\n");
}
dtrace("checking memory resources...\n");
vm_probe();
}
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