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mapping in kernel virtual address space

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git-svn-id: svn://anubis/hos/trunk@39 5b3e749e-e535-0410-8002-a9bb6afbdfca
This commit is contained in:
josh 2009-07-03 20:48:51 +00:00
parent edb1a6426d
commit e55f2cdfc4
1 changed files with 12 additions and 5 deletions
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17
kernel/mm/mm.cc
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@ -114,18 +114,25 @@ void mm_bootstrap()
page_directory[i] = 0; page_directory[i] = 0;
} }
/* /*
* now map all of RAM into the virtual address space * map all of RAM into the virtual address space
* starting at address 0x0 * starting at address 0x0 (except the null page)
*/ */
for (u32_t page_base = 0; for (u32_t page_base = PAGE_SIZE;
page_base < max_ram_address; page_base < max_ram_address;
page_base += PAGE_SIZE) page_base += PAGE_SIZE)
{ {
mm_map(page_base, page_base, 0, 1); mm_map(page_base, page_base, 0, 1);
} }
/* TODO: map kernel memory to KERNEL_OFFSET virtual region */ /* now map the kernel's virtual address space into RAM */
for (u32_t page_base = KERNEL_VIRTUAL_ADDRESS;
page_base < KERNEL_VIRTUAL_ADDRESS + KERNEL_SIZE;
page_base += PAGE_SIZE)
{
/* map page_base to page_base - KERNEL_OFFSET */
mm_map(page_base, page_base - KERNEL_OFFSET, 0, 1);
}
mm_use_virtual_offset = false; mm_use_virtual_offset = false;
} }