[[!meta copyright="Copyright © 2007, 2008, 2011, 2013, 2015 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. grub starts the execution at boot\_entry > i386/i386at/boothdr.S: boot\_entry: sets up C environment, i.e. sets up a basic stack and clears BSS, fixes ifunc. > i386/i386at/model\_dep.c: c\_boot\_entry: gets multiboot parameters >> i386/i386at/boothdr.S: discover\_x86\_cpu\_type: detect processor type >> i386/i386at/model\_dep.c: i386at\_init: initialize PC-specific stuff >>> i386/i386/pic.c: picinit: initialize 8259 PIC >>> i386/i386at/model\_dep.c: mem\_size\_init: compute memory size >>> i386/intel/pmap.c: pmap\_bootstrap: initialize x86 page table >>> i386/i386/gdt.c: gdt\_init: initialize x86 segmentation >>> i386/i386/idt.c: idt\_init: initialize x86 traps >>> i386/i386at/int\_init.c: int\_init: initialize PC interrupts >>> i386/i386/ldt.c: ldt\_init: initialize x86 segmentation >>> i386/i386/ktss.c: ktss\_init: initialize x86 task switching >> kern/startup.c: setup\_main: set up non-hardware specific stuff >>> kern/debug.c: panic\_init: initialize panic data >>> kern/printf.c: printf\_init: initialize printf >>> kern/sched\_prim.c: sched\_init: initialize scheduler >>>> kern/processor.c: pset\_sys\_bootstrap: initialize processor sets >>>> kern/ast.c: ast\_init: initialize Asychronous System Traps >>> vm/vm\_init.c: vm\_mem\_bootstrap: initialize virtual memory >>>> vm/vm\_resident.c: vm\_page\_bootstrap: turn physical pages into virtually allocatable pages >>>>> vm/vm\_resident.c: pmap\_startup: initialize pages >>>> kern/slab.c: slab\_bootstrap: early-initialize SLAB >>>> vm/vm\_object.c: vm\_object\_bootstrap: initialize VM object management >>>>> vm/vm\_external.c: vm\_external\_module\_initialize: initialize VM external object management >>>> vm/vm\_map.c: vm\_map\_init: initialize VM maps >>>> vm/vm\_kern.c: kmem\_init: initialize kernel's virtual memory >>>> i386/intel/pmap.c: pmap\_init: initialize remainder of x86 page table >>>> kern/slab.c: slab\_init: initialize remainder of SLAB >>>> kern/kalloc.c: kalloc\_init: initialize kallocator >>>> vm/vm\_fault.c: vm\_fault\_init: initialize VM fault management >>>> vm/vm\_resident.c: vm\_page\_module\_init: initialize remainder of virtual memory >>>> vm/memory\_object.c: memory\_manager\_default\_init: initialize remainder of VM object management >>> ipc/ipc\_init.c: ipc\_bootstrap: initialize IPC >>>> ipc/ipc\_table.c: ipc\_table\_init: initialize IPC tables >>>> ipc/ipc\_notify.c: ipc\_notify\_init: initialize IPC notification >>>> ipc/ipc\_hash.c: ipc\_hash\_init: initialize IPC reverse hash table >>>> ipc/ipc\_marequest.c: ipc\_marequest\_init: initialize msg-accepted request >>> vm/vm\_init.c: vm\_mem\_init: finish initializing VM >>>> vm/vm\_object.c: vm\_object\_init: finish initializing kernel object >>>> vm/memory\_object\_proxy: memory\_object\_proxy\_init: initialize memory object proxy >>> ipc/ipc\_init.c: ipc\_init: finish initializing IPC >>>> kern/ipc\_host.c: ipc\_host\_init: initialize host IPC >>>>> kern/ipc\_host.c: ipc\_pset\_init: initialize processor sets ports >>>>> kern/ipc\_host.c: ipc\_processor\_init: initialize processor ports >>> i386/intel/pmap.h: PMAP\_ACTIVATE\_KERNEL: activate kernel page table >>> kern/timer.c: init\_timers: initialize timers >>> kern/mach\_clock.c: init\_timeout: initialize timeout >>> kern/xpr.c: xprbootstrap: initialize xpr buffer >>> kern/time\_stamp.c: timestamp\_init: initialize tick >>> kern/mach\_clock.c: [[mapable\_time\_init|interface/device/time]] >>> i386/i386at/model\_dep.c: machine\_init: initialize x86 machine >>>> device/cons.c: cninit: initialize console >>>> i386/i386/fpu.c: init\_fpu: initialize 8087 FPU >>>> linux/dev/init/main.c: linux\_init: initialize linux drivers >>>>> linux/dev/arch/i386/kernel/irq.c: init\_IRQ: initialize IRQs >>>>>> linux/dev/arch/i386/kernel/irq.c: reserve\_mach\_irqs: register IRQs to mach >>>>> linux/dev/kernel/sched.c: linux\_sched\_init: initialize dumb scheduler >>>>> linux/dev/init/main.c: calibrate\_delay: calibrate delay loop >>>>> linux/dev/glue/kmem.c: linux\_kmem\_init: initialize memory management >>>>> linux/src/drivers/pci/pci.c: pci\_init: initialize PCI bus >>>>>> linux/src/arch/i386/kernel/bios32.c: pcibios\_init: call PCI BIOS32 initialization >>>>>> linux/src/drivers/pci/pci.c: scan\_bus: enumerate PCI devices >>>>>> linux/src/arch/i386/kernel/bios32.c: pcibios\_fixup: apply platform-specific fixes >>>>> linux/dev/glue/net.c: linux\_net\_emulation\_init: initialize network glue >>>>> linux/dev/drivers/block/genhd.c: device\_setup: initialize block devices >>>>>> linux/dev/glue/block.c: blk\_dev\_init: initialize linux block devices >>>>>>> linux/src/drivers/block/ide.c: ide\_init: initialize IDE driver >>>>>>> linux/dev/drivers/block/floppy.c: floppy\_init: initialize floppy driver >>>>>> linux/src/drivers/scsi/scsi.c: scsi\_dev\_init: initialize SCSI drivers >>>>>> linux/dev/net/core/dev.c: net\_dev\_init: initialize network drivers >>>>> linux/pcmcia-cs/glue/pcmcia.c: pcmcia\_init: initialize PCMCIA drivers >>>> i386/i386at/autoconf.c: probeio: probe mach-managed devices (com, lpr) >>>> i386/i386at/model\_dep.c: inittodr: get RTC time >>>> i386/intel/pmap.c: pmap\_unmap\_page\_zero: unmap address 0 >>>> kern/mach\_clock.c: mapable\_time\_init: initialize mappable time >>> kern/task.c: task\_init: initialize gnuamch atsk >>>> kern/syscall\_emulation.c: eml\_init: initialize user space emulation code >>> kern/thread.c: thread\_init: initialize thread management >>>> i386/i386/pcb.c: pcb\_module\_init: initialize PCB management >>>>> i386/i386/fpu.c: fpu\_module\_init: initialize FPU management >>> kern/thread\_swap.c: swapper\_init: initialize thread swapper >>> kern/sched\_prim.c: recompute\_priorities: initial priorities computation >>> kern/mach\_factor.c: compute\_mach\_factor: initial mach factor computation >>> kern/startup.c: thread\_start: create initial kernel thread >>> kern/startup.c: cpu\_launch\_first\_thread: start first user thread >>>> i386/intel/pmap.h: PMAP\_ACTIVATE\_KERNEL: activate kernel page table >>>> i386/i386at/model\_dep.c: startrtclock: start clock >>>>> i386/i386/pit.c: clkstart: start 8254 PIT >>>> i386/intel/pmap.h: PMAP\_ACTIVATE\_KERNEL: activate user page table >>>> i386/i386/pcb.c: load\_context: load first 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: run the paging out daemon >> Does not return. # IRC, freenode, #hurd, 2013-10-07 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? cureOS: the boot entry of the kernel is i386/i386at/boothdr.S , boot_entry that's what grub jumps to then that jumps to c_boot_entry and everything else is C grub loads it somehow. how does it prepare cpu and memoty, cpu cache control if any... segments for stack.. see the grub documentation basically it's all flat linear space does kernel transform it after that? see the ldt/gdt initialization from i386at_init and children nothing much fancy, a kernel cs/ds, and user cs/ds and paging, naturally sure