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https://github.com/RGBCube/serenity
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Lots of hacking:
- Turn Keyboard into a CharacterDevice (85,1) at /dev/keyboard. - Implement MM::unmapRegionsForTask() and MM::unmapRegion() - Save SS correctly on interrupt. - Add a simple Spawn syscall for launching another process. - Move a bunch of IO syscall debug output behind DEBUG_IO. - Have ASSERT do a "cli" immediately when failing. This makes the output look proper every time. - Implement a bunch of syscalls in LibC. - Add a simple shell ("sh"). All it can do now is read a line of text from /dev/keyboard and then try launching the specified executable by calling spawn(). There are definitely bugs in here, but we're moving on forward.
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parent
72514c8b97
commit
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29 changed files with 276 additions and 32 deletions
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@ -28,6 +28,7 @@ asm(
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" pushw %ss\n"
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" popw %ds\n"
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" popw %es\n"
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" popw %fs\n"
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@ -35,6 +36,7 @@ asm(
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" mov %esp, state_dump\n"
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" call clock_handle\n"
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" popw %gs\n"
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" popw %gs\n"
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" popw %fs\n"
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" popw %es\n"
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" popw %ds\n"
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@ -117,13 +119,18 @@ void clock_handle()
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// If this IRQ occurred while in a user task, wouldn't that also push the stack ptr?
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current->tss().esp = regs.esp + 12;
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// FIXME: Is this really safe? What if the interrupted process didn't have SS==DS?
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current->tss().ss = regs.ds;
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current->tss().ss = regs.ss;
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if ((current->tss().cs & 3) != 0) {
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// What do I do now?
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kprintf("clk'ed across to ring0\n");
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HANG;
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#if 0
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kprintf("clock'ed across to ring0\n");
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kprintf("code: %w:%x\n", current->tss().cs, current->tss().eip);
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kprintf(" stk: %w:%x\n", current->tss().ss, current->tss().esp);
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kprintf("astk: %w:%x\n", regs.ss_if_crossRing, regs.esp_if_crossRing);
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//HANG;
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#endif
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current->tss().ss = regs.ss_if_crossRing;
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current->tss().esp = regs.esp_if_crossRing;
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}
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// Prepare a new task to run;
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