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#include <stddef.h>
#include <stdint.h>
#include <system.h>
#include <lib/stdio.h>
#include <memory/paging.h>
#include <multiboot.h>
void *memcpy(void *dest, const void *src, u32 count)
{
const char *sp = (const char *)src;
char *dp = (char *)dest;
for (; count != 0; count--)
*dp++ = *sp++;
return dest;
}
void *memset(void *dest, char val, u32 count)
{
char *temp = (char *)dest;
for (; count != 0; count--)
*temp++ = val;
return dest;
}
int memcmp(const void *a_ptr, const void *b_ptr, u32 size)
{
const u8 *a = (const u8 *)a_ptr;
const u8 *b = (const u8 *)b_ptr;
for (u32 i = 0; i < size; i++) {
if (a[i] < b[i])
return -1;
else if (b[i] < a[i])
return 1;
}
return 0;
}
u32 total = 0;
struct multiboot_tag_basic_meminfo *meminfo = NULL;
u32 memory_get_all()
{
if (total != 0) {
return total;
} else if (meminfo != NULL) {
return meminfo->mem_lower + meminfo->mem_upper;
} else {
warn("Got no memory info, guessing size!");
return 42000; // This should not happen on a modern pc but well idk, 42MB?
}
}
u32 memory_get_free()
{
return memory_get_all() /*- paging_get_used_pages() * 4*/;
}
void memory_print()
{
// TODO: Fix multiboot mem lower/upper
/*if (meminfo != NULL) {
info("Mem lower: 0x%x", meminfo->mem_lower);
info("Mem upper: 0x%x", meminfo->mem_upper);
}*/
info("Total memory found: %dMiB", (memory_get_all() >> 10) + 1);
info("Total free memory: %dMiB", (memory_get_free() >> 10) + 1);
}
void memory_info_init(struct multiboot_tag_basic_meminfo *tag)
{
meminfo = tag;
}
void memory_mmap_init(struct multiboot_tag_mmap *tag)
{
u32 sum = 0;
struct multiboot_mmap_entry *mmap;
for (mmap = ((struct multiboot_tag_mmap *)tag)->entries;
(multiboot_u8 *)mmap < (multiboot_u8 *)tag + tag->size;
mmap = (multiboot_memory_map_t *)((u32)mmap +
((struct multiboot_tag_mmap *)tag)->entry_size)) {
if (mmap->type == MULTIBOOT_MEMORY_AVAILABLE) {
debug("Found free memory");
/* paging_set_present(mmap->addr, mmap->len >> 12); */
sum += mmap->len;
} else if (mmap->type == MULTIBOOT_MEMORY_RESERVED) {
debug("Found reserved memory");
/* paging_set_present(mmap->addr, mmap->len >> 12); */
/* paging_set_used(mmap->addr, mmap->len >> 12); */
} else if (mmap->type == MULTIBOOT_MEMORY_ACPI_RECLAIMABLE) {
debug("Found ACPI reclaimable memory");
} else if (mmap->type == MULTIBOOT_MEMORY_NVS) {
debug("Found NVS memory");
} else if (mmap->type == MULTIBOOT_MEMORY_BADRAM) {
warn("Found bad memory!");
}
}
total = sum >> 10; // I want kb
}
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