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Diffstat (limited to 'baremetal/README.md')
| -rw-r--r-- | baremetal/README.md | 22 |
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diff --git a/baremetal/README.md b/baremetal/README.md index af45760c..8a29a991 100644 --- a/baremetal/README.md +++ b/baremetal/README.md @@ -1,2 +1,24 @@ Some apps written in SubX and Mu. Where the rest of this repo relies on a few Linux syscalls, the apps in this subdirectory interface directly with hardware. + +I'd like to eventually test these programs on real hardware, and to that end +they are extremely parsimonious in the hardware they assume: + 0. Lots (more than 640KB/1MB) of RAM + 1. Pure-graphics video mode (1280x1024 pixels) in 256-color mode. + 2. Keyboard + +That's it: + * No wifi, no networking + * No multitouch, no touchscreen, no mouse + * No graphics acceleration, no graphics + * No virtual memory, no memory reclamation +Just your processor, gigabytes of RAM, a moderately-sized monitor and a +keyboard. + +These programs don't convert to ELF, so there's also currently no code/data +segment separation. Just labels and bytes. + +Most programs here assume `main` starts at address 0x8000 (1KB or 2 disk +sectors past the BIOS entrypoint). See baremetal/boot.hex for details. + +So far the programs have only been tested in Qemu and Bochs emulators. |