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[[!meta copyright="Copyright © 2007, 2008, 2011, 2013 Free Software Foundation,
Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]
`if NCPUS > 1` stuff is not being considered so far.
> i386/i386at/boothdr.S: \_start
> i386/i386at/boothdr.S: boot\_entry
>> i386/i386at/model\_dep.c: c\_boot\_entry
>>> i386/i386at/boothdr.S: discover\_x86\_cpu\_type
>>> i386/i386at/model\_dep.c: i386at\_init
>>>> i386/i386/pic.c: picinit
>>>> i386/i386at/model\_dep.c: mem\_size\_init
>>>> i386/intel/pmap.c: pmap\_bootstrap
>>>> i386/i386/gdt.c: gdt\_init
>>>> i386/i386/idt.c: idt\_init
>>>> i386/i386at/int\_init.c: int\_init
>>>> i386/i386/ldt.c: ldt\_init
>>>> i386/i386/ktss.c: ktss\_init
>>> kern/startup.c: setup\_main
>>>> kern/debug.c: panic\_init
>>>> kern/printf.c: printf\_init
>>>> kern/sched\_prim.c: sched\_init
>>>>> kern/sched\_prim.c: wait\_queue\_init
>>>>> kern/processor.c: pset\_sys\_bootstrap
>>>>> kern/ast.c: ast\_init
>>>> vm/vm\_init.c: vm\_mem\_bootstrap
>>>>> vm/vm\_resident.c: vm\_page\_bootstrap
>>>>>> vm/vm\_resident.c: pmap\_startup
>>>>> kern/zalloc.c: zone\_bootstrap
>>>>> vm/vm\_object.c: vm\_object\_bootstrap
>>>>>> vm/vm\_external.c: vm\_external\_module\_initialize
>>>>> vm/vm\_map.c: vm\_map\_init
>>>>> vm/vm\_kern.c: kmem\_init
>>>>> i386/intel/pmap.c: pmap\_init
>>>>> kern/zalloc.c: zone\_init
>>>>> kern/kalloc.c: kalloc\_init
>>>>> vm/vm\_fault.c: vm\_fault\_init
>>>>> vm/vm\_resident.c: vm\_page\_module\_init
>>>>> vm/memory\_object.c: memory\_manager\_default\_init
>>>> ipc/ipc\_init.c: ipc\_bootstrap
>>>>> ipc/ipc\_table.c: ipc\_table\_init
>>>>> ipc/ipc\_notify.c: ipc\_notify\_init
>>>>> ipc/ipc\_hash.c: ipc\_hash\_init
>>>>> ipc/ipc\_marequest.c: ipc\_marequest\_init
>>>> vm/vm\_init.c: vm\_mem\_init
>>>>> vm/vm\_object.c: vm\_object\_init
>>>> ipc/ipc\_init.c: ipc\_init
>>>>> kern/ipc\_host.c: ipc\_host\_init
>>>>>> kern/ipc\_host.c: ipc\_pset\_init
>>>>>> kern/ipc\_host.c: ipc\_pset\_enable
>>>>>> kern/ipc\_host.c: ipc\_processor\_init
>>>> i386/intel/pmap.h: PMAP\_ACTIVATE\_KERNEL
>>>> kern/timer.c: init\_timers
>>>> kern/mach\_clock.c: init\_timeout
>>>> kern/xpr.c: xprbootstrap
>>>> kern/time\_stamp.c: timestamp\_init
>>>> kern/mach\_clock.c: [[mapable\_time\_init|interface/device/time]]
>>>> i386/i386at/model\_dep.c: machine\_init
>>>>> device/cons.c: cninit
>>>>> i386/i386/fpu.c: init\_fpu
>>>>> linux/dev/init/main.c: linux\_init
>>>>>> linux/dev/arch/i386/kernel/irq.c: init\_IRQ
>>>>>>> linux/dev/arch/i386/kernel/irq.c: reserve\_mach\_irqs
>>>>>> linux/dev/kernel/sched.c: linux\_sched\_init
>>>>>> linux/dev/init/main.c: calibrate\_delay
>>>>>> linux/dev/glue/kmem.c: linux\_kmem\_init
>>>>>> linux/src/drivers/pci/pci.c: pci\_init
>>>>>>> linux/src/arch/i386/kernel/bios32.c: pcibios\_init
>>>>>>> linux/src/drivers/pci/pci.c: scan\_bus
>>>>>>> linux/src/arch/i386/kernel/bios32.c: pcibios\_fixup
>>>>>> linux/dev/glue/net.c: linux\_net\_emulation\_init
>>>>>> linux/dev/drivers/block/genhd.c: device\_setup
>>>>>>> linux/dev/glue/block.c: blk\_dev\_init
>>>>>>>> linux/src/drivers/block/ide.c: ide\_init
>>>>>>>> linux/dev/drivers/block/floppy.c: floppy\_init
>>>>>>> linux/src/drivers/scsi/scsi.c: scsi\_dev\_init
>>>>>>> linux/dev/net/core/dev.c: net\_dev\_init
>>>>>> linux/pcmcia-cs/glue/pcmcia.c: pcmcia\_init
>>>>> i386/i386at/autoconf.c: probeio
>>>>> i386/i386at/model\_dep.c: inittodr
>>>>> i386/intel/pmap.c: pmap\_unmap\_page\_zero
>>>> kern/task.c: task\_init
>>>>> kern/syscall\_emulation.c: eml\_init
>>>> kern/thread.c: thread\_init
>>>>> i386/i386/pcb.c: pcb\_module\_init
>>>>>> i386/i386/fpu.c: fpu\_module\_init
>>>>>> i386/i386/iopb.c: iopb\_init
>>>> kern/thread\_swap.c: swapper\_init
>>>> kern/sched\_prim.c: recompute\_priorities
>>>> kern/mach\_factor.c: compute\_mach\_factor
>>>> kern/startup.c: start\_kernel\_threads
[...]
>>>> kern/startup.c: cpu\_launch\_first\_thread
>>>>> i386/i386at/model\_dep.c: startrtclock
>>>>>> i386/i386/pit.c: clkstart
>>>>> i386/intel/pmap.h: PMAP\_ACTIVATE\_KERNEL
>>>>> i386/i386/pcb.c: load\_context
[...]
> kern/startup.c: start\_kernel\_threads
> Threads get created.
>> kern/sched\_prim.c: idle\_thread
>> One for each CPU.
>> kern/thread.c: reaper\_thread
>> kern/thread\_swap.c: swapin\_thread
>> kern/sched\_prim.c: sched\_thread
>> [...]
>> kern/bootstrap.c: bootstrap\_create
>>> The [[grub/multiboot]] modules have been put somewhere into memory by
>>> [[GRUB]]. The boot scripts are parsed. The modules' ELF image's `PT_LOAD`
>>> sections are \`\`read'' (that is, `vm_allocate` and `copyout`) and turned
>>> into real [[task]]s. The multiboot modules' memory regions can be
>>> deallocated then.
>> [...]
>> vm\_pageout
>> Does not return.
# IRC, freenode, #hurd, 2013-10-07
<cureOS> look, where should i dig or where from should i start from, if i
have desire to know how the kernel was written from baremetal? Can it be
ever done nowadays?
<youpi> cureOS: the boot entry of the kernel is i386/i386at/boothdr.S ,
boot_entry
<youpi> that's what grub jumps to
<youpi> then that jumps to c_boot_entry
<youpi> and everything else is C
<cureOS> grub loads it somehow. how does it prepare cpu and memoty, cpu
cache control if any... segments for stack..
<youpi> see the grub documentation
<youpi> basically it's all flat linear space
<cureOS> does kernel transform it after that?
<youpi> see the ldt/gdt initialization
<youpi> from i386at_init and children
<youpi> nothing much fancy, a kernel cs/ds, and user cs/ds
<braunr> and paging, naturally
<youpi> sure
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