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// MIT License, Copyright (c) 2021 Marvin Borner
#include <assert.h>
#include <def.h>
#include <drivers/serial.h>
#include <mem.h>
#include <mm.h>
#include <multiboot.h>
PROTECTED static struct multiboot_info *info = NULL;
PROTECTED static u8 vbe_available = 0;
PROTECTED static char vbe[256] = { 0 };
CLEAR static void multiboot_parse_cmdline(const char *line)
{
const char *start = line;
for (const char *p = line; p && *p; p++) {
if (*p == ' ')
start = p + 1;
if (memcmp(start, "log", 3) == 0 && !ALPHANUMERIC(start[3])) {
serial_enable();
start += 3;
}
}
}
CLEAR u32 multiboot_vbe(void)
{
return vbe_available ? (u32)vbe : 0;
}
CLEAR void multiboot_mmap(void)
{
assert(info->flags & MULTIBOOT_INFO_MEM_MAP);
struct multiboot_mmap_entry *mmap = (void *)info->mmap_addr;
u32 length = info->mmap_length;
u32 count = length / sizeof(*mmap);
u32 total = 0;
for (u32 i = 0; i < count; i++) {
/* printf("Memory region 0x%x-0x%x\n", mmap->addr, mmap->addr + mmap->len); */
if (mmap->type == MULTIBOOT_MEMORY_AVAILABLE) {
total += mmap->len;
physical_set_free(memory_range_from(mmap->addr, mmap->len));
} else if (mmap->type == MULTIBOOT_MEMORY_BADRAM) {
printf("Defect memory at 0x%x-0x%x\n", mmap->addr, mmap->addr + mmap->len);
} else {
// Memory is set to 'used' by default
}
mmap++;
}
physical_set_total(total);
}
CLEAR void multiboot_init(u32 magic, u32 addr)
{
assert(magic == MULTIBOOT_MAGIC);
info = (void *)addr;
if (info->flags & MULTIBOOT_INFO_CMDLINE)
multiboot_parse_cmdline((const char *)info->cmdline);
if (info->flags & MULTIBOOT_INFO_VBE_INFO) {
memcpy(vbe, (void *)info->vbe_mode_info, sizeof(vbe));
vbe_available = 1;
}
serial_print("Kernel was compiled at " __TIME__ " on " __DATE__ "\n");
}
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