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Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_missing/1159')
| -rw-r--r-- | gitlab/issues_text/target_missing/host_missing/accel_missing/1159 | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/gitlab/issues_text/target_missing/host_missing/accel_missing/1159 b/gitlab/issues_text/target_missing/host_missing/accel_missing/1159 deleted file mode 100644 index 6275e1d5c..000000000 --- a/gitlab/issues_text/target_missing/host_missing/accel_missing/1159 +++ /dev/null @@ -1,32 +0,0 @@ -Strange invalid access errors for very basic OS -Description of problem: -Currently I'm studying OS development. I found numerous guides on that topic, however [this one](https://github.com/cfenollosa/os-tutorial/tree/master/01-bootsector-barebones) is most close to what I have been doing. -When `.bin` file is launched with `-d guest_errors` flag, before any OS output exactly 512 error messages appear in logs, that look like that: -``` -Invalid access at addr 0xFEBB0000, size 1, region '(null)', reason: rejected -Invalid access at addr 0x0, size 1, region '(null)', reason: rejected -Invalid access at addr 0xFEBB0001, size 1, region '(null)', reason: rejected -Invalid access at addr 0x1, size 1, region '(null)', reason: rejected -Invalid access at addr 0xFEBB0002, size 1, region '(null)', reason: rejected -... -and it goes up to -... -Invalid access at addr 0xFEBB00FE, size 1, region '(null)', reason: rejected -Invalid access at addr 0xFE, size 1, region '(null)', reason: rejected -Invalid access at addr 0xFEBB00FF, size 1, region '(null)', reason: rejected -Invalid access at addr 0xFF, size 1, region '(null)', reason: rejected -``` -Apparently, the OS boots normally after that. Should I be concerned about these messages or Should I just ignore them? -That looks strange and confusing, not a piece of my code calls these addresses. Maybe I'm doing something wrong? -Steps to reproduce: -1. Install `nasm` compiler (nasm package for apt) -2. Create a file named `os.asm` with exactly four lines: -```asm -loop: - jmp loop -times 510-($-$$) db 0 -dw 0xaa55 -``` -3. Build it with `nasm -f bin os.asm -o os.bin` -4. Run it with `qemu-system-i386 -d guest_errors -drive format=raw,file=./os.bin` -5. ...enjoy error messages. |