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| author | Kartik Agaram <vc@akkartik.com> | 2021-01-24 11:56:58 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2021-01-24 19:43:23 -0800 |
| commit | 0cf7cecedc463891c236e3c81a19cd24ce6efc70 (patch) | |
| tree | c6cd3b42f10d89d0f2e2d807cd14e1cc53a7ffd0 | |
| parent | 1c490388d13bb0fa3cab4fa245d6e17da1b22b87 (diff) | |
| download | mu-0cf7cecedc463891c236e3c81a19cd24ce6efc70.tar.gz | |
7557
Oh, stupid mistake in segmented address calculation. Now Qemu's working again everywhere. Bochs is again broken everywhere. But I think we're getting closer. I think Bochs's BIOS implementation for reading sectors has two interacting constraints: - Can't write to more than 0x10000 bytes past segment register. - Can't write across segment alignment boundaries. Qemu only cares about the first.
| -rw-r--r-- | baremetal/boot.hex | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/baremetal/boot.hex b/baremetal/boot.hex index c05a3f19..491e3718 100644 --- a/baremetal/boot.hex +++ b/baremetal/boot.hex @@ -100,7 +100,7 @@ # "Addressing of Buffer should guarantee that the complete buffer is inside # the given segment, i.e. ( BX + size_of_buffer ) <= 10000h." # https://en.wikipedia.org/wiki/INT_13H#INT_13h_AH=02h:_Read_Sectors_From_Drive - bb 00 fa # bx <- 0xfa00 [label] + bb a0 0f # bx <- 0xfa0 8e c3 # es <- bx bb 00 00 # bx <- 0 cd 13 # int 13h, BIOS disk service |