60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
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#include "mm.h"
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#include "boot/k_early_panic.h"
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#define MM_MAX_MMAP_ENTRIES 64
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extern "C" {
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pagedirectory_t page_directory __attribute__ ((aligned (4096)));
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static mm_mem_range_t mm_mmap_entries[MM_MAX_MMAP_ENTRIES];
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static int mm_mmap_num_entries = 0;
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/**************************************************************************
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* This function is run in segmented memory before paging is in effect. *
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*************************************************************************/
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void mm_record_mmap_entry(mb_mmap_t * mmap)
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{
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if (mm_mmap_num_entries < MM_MAX_MMAP_ENTRIES)
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{
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if (mmap->type == MB_MMAP_TYPE_RAM)
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{
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mm_mmap_entries[mm_mmap_num_entries].base = mmap->base;
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mm_mmap_entries[mm_mmap_num_entries].length = mmap->length;
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mm_mmap_num_entries++;
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}
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}
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else
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{
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k_early_panic("Too many mmap_entries!");
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}
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}
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/**************************************************************************
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* This function is run in segmented memory before paging is in effect. *
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* It is run after the bootloader information has been read, so we can *
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* overwrite that memory now. *
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*************************************************************************/
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void mm_bootstrap()
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{
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if (mm_mmap_num_entries < 1)
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{
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k_early_panic("No mmap entries read from bootloader!");
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}
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for (int mmap_idx = 0; mmap_idx < mm_mmap_num_entries; mmap_idx++)
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{
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}
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/* Clear the page directory */
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for (unsigned int i = 0;
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i < sizeof(page_directory) / sizeof(page_directory[0]);
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i++)
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{
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page_directory[i] = 0;
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}
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}
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} /* extern "C" */
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