97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
#include <multiboot2.h>
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#include <pmm.h>
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#include <cdef.h>
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#include <print.h>
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#include <memory_layout.h>
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// Putting multiboot device info here
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static char *loader_name = 0x0;
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static void *file_mod = 0x0;
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// OH BOY DON"T I FUCKING LOVE THIS SHIT
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static uint64 _low = 0;
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static uint64 _high = 0;
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void
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process_mmap(struct multiboot_tag_mmap *mmap)
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{
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struct multiboot_mmap_entry entry;
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uint16 num_entries = (mmap->size - sizeof(*mmap)) / mmap->entry_size;
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for (uint16 i = 0; i < num_entries; i++)
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{
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entry = mmap->entries[i];
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if ((entry.type == 1) && (entry.len > _high - _low))
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{
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#ifdef KDBG
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kprintf("Update low: 0x%x high: 0x%x\n", (uint64) entry.addr, (uint64) (entry.addr + entry.len));
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#endif
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_high = entry.addr + entry.len;
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_low = entry.addr;
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}
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}
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}
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void
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process_tag(htag *tag)
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{
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struct multiboot_tag_mmap *mmap_tag;
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struct multiboot_tag_string *strtag;
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struct multiboot_tag_module *modtag;
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while(1)
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{
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if(tag->type == MULTIBOOT_HEADER_TAG_END)
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{
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break;
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}
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switch (tag->type)
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{
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case MULTIBOOT_TAG_TYPE_BOOT_LOADER_NAME:
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strtag = (struct multiboot_tag_string *) tag;
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loader_name = &strtag->string[0];
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tag = (void*)ALIGN(uintptr, (uintptr)tag + tag->size, MULTIBOOT_TAG_ALIGN);
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break;
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case MULTIBOOT_TAG_TYPE_MMAP:
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mmap_tag = (struct multiboot_tag_mmap *) tag;
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process_mmap(mmap_tag);
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tag = (void*)ALIGN(uintptr, (uintptr)tag + tag->size, MULTIBOOT_TAG_ALIGN);
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break;
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case MULTIBOOT_TAG_TYPE_MODULE:
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modtag = (struct multiboot_tag_module *)tag;
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file_mod = modtag;
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tag = (void*)ALIGN(uintptr, (uintptr)tag + tag->size, MULTIBOOT_TAG_ALIGN);
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break;
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default:
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tag = (void*)ALIGN(uintptr, (uintptr)tag + tag->size, MULTIBOOT_TAG_ALIGN);
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break;
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}
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}
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}
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void parse_mb2(mbentry *mb, void **module, char **ld_name, uint64 *low, uint64 *high)
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{
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uint64 tag_base0 = (uint64) mb;
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uint64 next_entry;
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uint64 last_entry;
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next_entry = tag_base0 + 8;
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last_entry = tag_base0 + mb->total_size - 8;
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htag *last_tag = (htag *) last_entry;
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if (!(last_tag->type == 0 && last_tag->size == 8))
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{ return; }
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htag *tag = (htag *) next_entry;
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process_tag(tag);
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*module = file_mod;
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*ld_name = loader_name;
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*low = _low;
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*high = _high;
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}
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