86 lines
2.1 KiB
C
86 lines
2.1 KiB
C
#include "stdint.h"
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#include "stddef.h"
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#include "registers.h"
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#include "string.h"
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#include "hooks.h"
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#include "init.h"
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#include "main.h"
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#include "relocate.h"
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#include "etherboot.h"
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/* Symbols defined by the linker */
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extern char _bss[], _ebss[];
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/*
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* This file provides the basic entry points from assembly code. See
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* README.i386 for a description of the entry code path.
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*
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*/
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/*
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* arch_initialise(): perform any required initialisation such as
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* setting up the console device and relocating to high memory. Note
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* that if we relocate to high memory and the prefix is in base
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* memory, then we will need to install a copy of librm in base
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* memory. librm's reset function takes care of this.
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*
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*/
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#include "librm.h"
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void arch_initialise ( struct i386_all_regs *regs __unused ) {
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/* Zero the BSS */
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memset ( _bss, 0, _ebss - _bss );
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/* Call all registered initialisation functions.
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*/
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call_init_fns ();
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/* Relocate to high memory. (This is a no-op under
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* -DKEEP_IT_REAL.)
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*/
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relocate();
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/* Call all registered reset functions. Note that if librm is
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* included, it is the reset function that will install a
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* fresh copy of librm in base memory. It follows from this
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* that (a) librm must be first in the reset list and (b) you
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* cannot call console output functions between relocate() and
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* call_reset_fns(), because real-mode calls will crash the
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* machine.
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*/
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call_reset_fns();
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printf ( "init finished\n" );
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regs->es = virt_to_phys ( installed_librm ) >> 4;
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__asm__ ( "xchgw %bx, %bx" );
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}
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/*
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* arch_main() : call main() and then exit via whatever exit mechanism
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* the prefix requested.
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*
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*/
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void arch_main ( struct i386_all_regs *regs ) {
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void (*exit_path) ( struct i386_all_regs *regs );
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/* Determine exit path requested by prefix */
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exit_path = ( typeof ( exit_path ) ) regs->eax;
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/* Call to main() */
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regs->eax = main();
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/* Call registered per-object exit functions */
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call_exit_fns ();
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if ( exit_path ) {
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/* Prefix requested that we use a particular function
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* as the exit path, so we call this function, which
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* must not return.
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*/
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exit_path ( regs );
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}
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}
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