OSDev.org

Posted: **Wed Aug 22, 2012 1:12 am**

This looks perfectly fine to me for a 4 MB machine, so if your code works correctly, it should print the same values:

// lower memory
   Usable RAM:  Base Address:  0x0 X 4GB + 0x0,
      Length:   0x0 X 4GB + 0x9f400 bytes
// EBDA
   Reserved:  Base Address:  0x0 X 4GB + 0x9f400,
      Length:   0x0 X 4GB + 0xc00 bytes
// BIOS ROM
   Reserved:  Base Address:  0x0 X 4GB + 0xf0000,
      Length:   0x0 X 4GB + 0x10000 bytes
// upper memory (3 MB - 8 kB)
   Usable RAM:  Base Address:  0x0 X 4GB + 0x100000,
      Length:   0x0 X 4GB + 0x2fe000 bytes
// ACPI reserved (8 kB)
   Reserved:  Base Address:  0x0 X 4GB + 0x3fe000,
      Length:   0x0 X 4GB + 0x2000 bytes
// some other ROM
   Reserved:  Base Address:  0x0 X 4GB + 0xfffc0000,
      Length:   0x0 X 4GB + 0x40000 bytes

Since you don't use GRUB, how do you obtain the memory map? Using int 15h? Have you checked that part of your code?

Posted: **Wed Aug 22, 2012 12:17 pm**

My memory map works fine. I think we are both trying to help the OP (requimrar).

Posted: **Wed Aug 22, 2012 12:42 pm**

sounds wrote:My memory map works fine. I think we are both trying to help the OP (requimrar).

Indeed, I didn't see that you posted the memory map, I thought requimrar had written that post... Never mind.

Posted: **Thu Aug 23, 2012 2:30 am**

Apologies. My computer fried, so I had to replace the hard drive. I'll be posting the memory map up in a while, thanks for the help in the meantime.

EDIT: I got my machine up and running. This time though, I compiled QEMU from source. However, I'm still getting that bogus memory from 0x100000, 0x1efe000 in length.

Is it safe to assume that memory actually exists?

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