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Author SHA1 Message Date
Andreas Kling fc88368582 Have Console::write() directly call vga_putch. 2018-10-21 22:44:26 +02:00
Andreas Kling a70bfb87d5 Add a Console device and start refactoring screen output. 2018-10-21 21:59:43 +02:00
Andreas Kling d5ec18027e Protect the first 4 KB of memory. 
This makes null pointers crashy, tremendously useful :^)
 2018-10-21 21:59:11 +02:00
Andreas Kling dd6706a1a1 Fix null deref in contextSwitch(). 2018-10-21 21:57:43 +02:00
Andreas Kling 2f99ff801e Move post-boot kernel stack pointer to 0x4000. 2018-10-21 21:51:12 +02:00
Andreas Kling 46ff281695 Turn the syscall interrupt into a trap (by switching the gate type.) 
This leaves interrupts enabled while we're in the kernel, which is
precisely what we want.

This uncovered a horrendous problem with kernel tasks silently
overflowing their stacks. For now I've simply increased the stack size
but I need a more MMU-y solution for this eventually.
 2018-10-19 11:31:18 +02:00
Andreas Kling 2d1d01661b Add a way to initialize VFS globals. 
This is needed since the kernel loader doesn't even zero out bss,
much less call any static constructors.
 2018-10-19 11:20:49 +02:00
Andreas Kling 97e0d75bcb ELFLoader works inside the kernel! 
We load /_hello.o which just prints out a simple message.
It executes inside the kernel itself, so no fancy userspace process
or anything, but this is still so cool!
 2018-10-18 15:46:08 +02:00
Andreas Kling 6ab0649ad6 ksprintf() should null-terminate strings. 2018-10-18 15:24:07 +02:00
Andreas Kling c149d2a8f0 Build ELFLoader into Kernel. 2018-10-18 15:03:10 +02:00
Andreas Kling 3649638259 Add Regions concept to Task. 2018-10-18 14:55:20 +02:00
Andreas Kling 5b10846bed Add a simple ELF binary called _test.o to the test fs. 2018-10-18 13:16:30 +02:00
Andreas Kling f67d695254 More paging stuff. 
The test userspace process now runs at linear address 0x300000 which is
mapped to a dynamically allocated page from the MemoryManager. Cool!
 2018-10-18 13:05:00 +02:00
Andreas Kling 89851a9ded Use FileHandle from VFS. 2018-10-18 10:28:09 +02:00
Andreas Kling e86cadc7af Add an fd field to FileHandle in Kernel builds. 2018-10-18 10:27:07 +02:00
Andreas Kling 9d5de91cf3 Actually destroy tasks after they crash. 2018-10-18 00:26:30 +02:00
Andreas Kling 1a801e5737 Hang if we GPF in ring 0. 2018-10-18 00:13:06 +02:00
Andreas Kling 56c1f9db8e A userspace process can now GPF and the OS goes on! 
This is really rickety, but it kinda sorta works for my test GPF!
 2018-10-17 23:49:32 +02:00
Andreas Kling 77299cf54d Add basic paging. Only identity maps the bottom 4MB as a start. 2018-10-17 23:13:55 +02:00
Andreas Kling 286e27ef40 Allow running in QEMU with "./run q" 
The kernel doesn't run in QEMU right now and I don't know why.
 2018-10-17 16:58:35 +02:00
Andreas Kling 8ff394f83f Fix a dumb in buffer_putch. 2018-10-17 16:56:47 +02:00
Andreas Kling 9aa88fe186 Add a PIC::getISR() helper. 2018-10-17 16:54:49 +02:00
Andreas Kling e0f31d38a2 Add -fno-pic -fno-pie to build flags. 2018-10-17 16:49:30 +02:00
Andreas Kling f82b25d4f9 Fix some minor build warnings. 2018-10-17 16:48:43 +02:00
Andreas Kling 347e202f7f Add size_t and ssize_t to kernel builds. 2018-10-17 16:47:19 +02:00
Andreas Kling 7580ac576f Make VFS host build work again. 2018-10-17 12:23:19 +02:00
Andreas Kling 39fa1eb2c2 Print the contents of motd.txt on boot. 2018-10-17 12:07:39 +02:00
Andreas Kling 705832f387 List the root directory after mounting /. 
So cool that it works! It's spewing out a bunch of terminal escape sequences
that the OS console obviously doesn't support, but we'll get there too.
 2018-10-17 11:47:14 +02:00
Andreas Kling b05ed591ab VFS mounts an ext2fs root! :^) 2018-10-17 11:44:06 +02:00
Andreas Kling d2425495ca VirtualFileSystem class builds inside Kernel. 2018-10-17 11:40:58 +02:00
Andreas Kling 9171521752 Integrate ext2 from VFS into Kernel. 2018-10-17 10:57:23 +02:00
Andreas Kling aec8ab0a60 Add the basic character devices to kernel. 2018-10-16 14:33:16 +02:00
Andreas Kling 12e515735b Add a simple IDEDiskDevice class that implements DiskDevice from VFS. 2018-10-16 14:17:43 +02:00
Andreas Kling 8293a0ff36 Rework DiskDevice's read() and write() to be non-virtual wrappers. 
This way subclasses only have to implement readBlock() and writeBlock().
read() and write() require that the offset and length are both divisible
by the blockSize().
 2018-10-16 14:13:32 +02:00
Andreas Kling cafb5b2ad6 Fixup small.fs again. 2018-10-16 14:00:44 +02:00
Andreas Kling 5d465582a3 Start fixing up AK to work inside the kernel. 2018-10-16 13:59:28 +02:00
Andreas Kling 1203c327c7 Merge some features from gerbert into OwnPtr and RetainPtr. 2018-10-16 12:21:06 +02:00
Andreas Kling fd708a4cb1 Reduce dependence on STL. 2018-10-16 12:11:27 +02:00
Andreas Kling 0c1a4e8de3 Add String::substring(). 2018-10-16 12:07:17 +02:00
Andreas Kling 9cd0a34b5c BlockDevice -> DiskDevice. 
BlockDevice was the wrong name for this abstraction, since a block device
is a type of file in a unix system, and we should use that name for that
concept in the fs implementation.
 2018-10-16 11:21:49 +02:00
Andreas Kling 72bb80a9ae These changes were lying around uncommitted in the old repo. 
I'm just gonna commit them without too much thinking and then take
it from there.
 2018-10-16 11:06:35 +02:00
Andreas Kling 87d41bdca4 If an interrupt comes from the slave PIC, both PICs need an EOI. 2018-10-16 11:05:29 +02:00
Andreas Kling 9396108034 Import the "gerbert" kernel I worked on earlier this year. 
It's a lot crappier than I remembered it. It's gonna need a lot of work.
 2018-10-16 11:02:00 +02:00
Andreas Kling f608629704 Implement creating a new directory. 2018-10-16 00:35:03 +02:00
Andreas Kling 5c50d02c2e Fix bug where allocating a new inode forgot that inodes are 1-based. 2018-10-15 02:42:24 +02:00
Andreas Kling b0eaca436c "stat" command should print st_mode in octal. 2018-10-15 02:12:09 +02:00
Andreas Kling 47fc6344ac Support the ext2 directory entry file_type field. 2018-10-15 01:57:57 +02:00
Andreas Kling e7901476d3 Bring back the intentionally broken symlink I had for testing. 2018-10-15 01:00:01 +02:00
Andreas Kling 05b088ee2f Add a simple /dev/random. 2018-10-15 00:44:54 +02:00
Andreas Kling 9528edab92 Move readEntireInode() up to FileSystem (from ext2.) 
It's just a wrapper around multiple calls to readInodeBytes() now.
 2018-10-15 00:16:14 +02:00