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* 7457Kartik Agaram2020-12-282-10/+14
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* 7456Kartik Agaram2020-12-281-2/+1
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* 7454Kartik Agaram2020-12-284-338/+119
| | | | Go back to commit 7448.
* 7453Kartik Agaram2020-12-281-74/+23
| | | | | Snapshot: this approach of disambiguating /disp32 based on metadata doesn't work. The `survey` phase runs after `pack`, which gets rid of most metadata.
* 7452Kartik Agaram2020-12-284-24/+286
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* 7451Kartik Agaram2020-12-284-20/+28
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* 7450Kartik Agaram2020-12-282-2/+2
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* 7447Kartik Agaram2020-12-282-2/+2
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* 7446Kartik Agaram2020-12-282-185/+0
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* 7445Kartik Agaram2020-12-282-185/+0
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* 7444Kartik Agaram2020-12-281-1/+1
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* 7443Kartik Agaram2020-12-282-0/+4772
| | | | | A new phase for baremetal compilations. Doesn't work yet, but it passes all its tests, so we can add it to CI.
* 7442Kartik Agaram2020-12-281-0/+0
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* 7441Kartik Agaram2020-12-2816-16/+16
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* 7439 - start translating Mu programs to baremetalKartik Agaram2020-12-283-6/+6
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* 7403 - baremetal/ for apps without a kernelKartik Agaram2020-12-2610-905/+0
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* 7402Kartik Agaram2020-12-261-3/+3
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* 7399Kartik Agaram2020-12-241-3/+3
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* 7398Kartik Agaram2020-12-231-2/+2
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* 7395 - boot.hex: recognize '1' press on keyboardKartik Agaram2020-12-231-5/+9
| | | | | https://stackoverflow.com/questions/37618111/keyboard-irq-within-an-x86-kernel is right, no need to mess with the status port at the start.
* 7394Kartik Agaram2020-12-231-1/+1
| | | | | | I think https://stackoverflow.com/questions/37618111/keyboard-irq-within-an-x86-kernel has more insight to provide. Among other things the comment about grub may answer the distinction between entry 0x21 and entry 9.
* 7393Kartik Agaram2020-12-231-9/+46
| | | | | | | | | | | | | | Snapshot. Keyboard interrupt being triggered. This was hard to debug until https://stackoverflow.com/questions/37618111/keyboard-irq-within-an-x86-kernel reminded me that I'd forgotten to enable IRQ1 on port 0x21. For a while I was confused by never hitting a breakpoint at the start of the keyboard handler. Then I found https://sourceforge.net/p/bochs/discussion/39592/thread/5e397455 and started skipping one instruction in my breakpoint. I still don't understand the discrepancy between some people installing the handler at entry 9, and others installing at entry 0x21 = 33.
* 7392Kartik Agaram2020-12-231-2/+2
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* 7391Kartik Agaram2020-12-231-62/+9
| | | | | | | | Turns out we just need a null handler at offset 8 rather than offset 9. If the keyboard handler is indeed at offset 9 as https://alex.dzyoba.com/blog/os-interrupts says (I don't understand why), then the clock handler's at offset 8, which makes sense.
* 7390 - null interrupt tablesKartik Agaram2020-12-231-11/+69
| | | | | Looks like the reset loops stop if we create null handlers for the first 10 indexes in the IDT.
* 7389 - snapshotKartik Agaram2020-12-231-6/+6
| | | | | | | | | | | | | Ok, we're back at the reset loop. Let's keep going; maybe having a decent keyboard handler will fix it. The bug I fixed here was caused by misunderstanding what m16&32 mean in the Intel manual. It's still a regular regmem operand that uses all of the ModR/M byte (which can be interpreted in 16-bit mode, adding to the complication). It's just constrained to not allow direct addressing (mod 00). I needed to better internalize the format of the instruction set references at the start of Volume 2, Chapter 3.
* 7388 - snapshot initializing interrupt tableKartik Agaram2020-12-231-24/+69
| | | | | | | | | | | | | | | | | | | | | | | | | I'm now back at the state of commit 7382 (including 7376). The existing print to screen surprisingly seems to work without reset-looping, but when I step through I notice that the lidt isn't doing what I expect. Desired: at address 0x7cce, the processor executes: 0f 01 1e 00 7f # lidt ds:*idt_descriptor Observed: at address 0x7cce, the processor executes: 0f 01 1e # lidt ds:*esi As a result the next instruction is: 00 7f fb So the `fb` isn't interpreted to enable interrupts. So the problem of commit 7376 is latent. Past this point the instruction stream is lined up again, and everything occurs as it should. Purely by chance. I fully expect all hell to break loose again, like it did in commit 7376, once I debug the lidt encoding. There's still something I don't understand about enabling interrupts. Perhaps I need to fill in more entries in the table.
* 7387Kartik Agaram2020-12-231-3/+4
| | | | | | Redo commit 7381. There was a bug. Current state: commit 7381 excluding 7376.
* 7386Kartik Agaram2020-12-231-2/+3
| | | | Commit 7380 excluding 7376.
* 7385Kartik Agaram2020-12-231-6/+6
| | | | Commit 7379 excluding 7376.
* 7384Kartik Agaram2020-12-231-4/+23
| | | | | Currently at commit 7378 (reset the A20 address line) except without 7376 (enabling interrupts).
* 7383Kartik Agaram2020-12-231-101/+36
| | | | | Currently at commit 7377 except without 7376 (enabling interrupts). Works as advertised.
* 7382 - snapshotKartik Agaram2020-12-231-21/+62
| | | | | Turns out I've been "testing" with a stale file since commit 7373. We need to go over everything since then.
* 7381Kartik Agaram2020-12-231-3/+3
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* 7380Kartik Agaram2020-12-231-2/+3
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* 7379Kartik Agaram2020-12-231-6/+6
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* 7378Kartik Agaram2020-12-231-4/+23
| | | | | | | | Turns out we only had access to 50% of RAM so far. Closing my nose and moving right along.. Though this _does_ give me practice interacting with ports. That'll be handy for the keyboard.
* 7377Kartik Agaram2020-12-231-5/+5
| | | | | | | Ooh, look at that, the device number comes conveniently initialized in the right register. No need to hardcode it. https://wiki.osdev.org/MBR_(x86)
* 7376Kartik Agaram2020-12-231-3/+7
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* 7375Kartik Agaram2020-12-231-9/+20
| | | | A little more robustness after reading https://stackoverflow.com/questions/43786251/int-13h-42h-doesnt-load-anything-in-bochs/43787939#43787939
* 7373Kartik Agaram2020-12-211-1/+1
| | | | | apps/boot.hex doesn't need much by way of syntax highlighting. Have it work even for people who haven't installed subx.vim
* 7372 - successful read from disk using BIOSKartik Agaram2020-12-211-13/+48
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* 7371Kartik Agaram2020-12-211-1/+1
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* 7370Kartik Agaram2020-12-212-7/+8
| | | | Use a more realistically sized disk image. Now we can read the second sector.
* 7369 - read hard disk using BIOSKartik Agaram2020-12-202-8/+2
| | | | | | There were two problems: a) We have only 1 sector per track (spt=1), so 'second sector' is meaningless. b) Drives 0-127 are reserved for floppies.
* 7368 - ooh, int 13h works with a floppyKartik Agaram2020-12-201-0/+6
| | | | | Lots of great tips here: https://stackoverflow.com/questions/43786251/int-13h-42h-doesnt-load-anything-in-bochs/43787939#43787939
* 7367 - start of boot sector for Mu computerKartik Agaram2020-12-202-0/+191
| | | | | Not working yet. Reading sectors from disk returns an error (sets carry flag).
* 7366Kartik Agaram2020-12-201-22/+24
| | | | | | Move more padding around. Reading a sector from disk requires about 24 bytes of code.
* 7365Kartik Agaram2020-12-201-4/+4
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* 7364Kartik Agaram2020-12-201-11/+12
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