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Added post-relocation function table.

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This commit is contained in:
Michael Brown 2005-04-10 18:18:37 +00:00
parent 9abceef561
commit f06e8c9707
3 changed files with 40 additions and 10 deletions
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25
src/arch/i386/core/relocate.c
View File

@ -2,6 +2,7 @@
#include "memsizes.h"
#include "osdep.h"
#include "etherboot.h"
#include "init.h"
#include "relocate.h"
#ifndef KEEP_IT_REAL
@ -38,6 +39,8 @@ extern char _max_align[];
/* Linker symbols */
extern char _text[];
extern char _end[];
extern struct post_reloc_fn post_reloc_fns[];
extern struct post_reloc_fn post_reloc_fns_end[];
#undef DBG
#ifdef DEBUG_RELOCATE
@ -46,9 +49,10 @@ extern char _end[];
#define DBG(...)
#endif
void relocate ( void ) {
static void relocate ( void ) {
unsigned long addr, eaddr, size;
unsigned i;
struct post_reloc_fn *post_reloc_fn;
/* Walk through the memory map and find the highest address
* below 4GB that etherboot will fit into. Ensure etherboot
@ -186,12 +190,23 @@ void relocate ( void ) {
relocate_to ( addr );
/* Note that we cannot make real-mode calls
* (e.g. printf) at this point, because the pointer
* installed_librm uses a virtual address (in order
* that it can have a valid initialiser) and so is
* currently invalid.
* (e.g. printf) at this point, because librm has just
* been moved to high memory.
*/
/* Call any registered post-relocation functions.
* librm has a post-relocation function to install a
* new librm into base memory.
*/
for ( post_reloc_fn = post_reloc_fns;
post_reloc_fn < post_reloc_fns_end ; post_reloc_fn++ ) {
if ( post_reloc_fn->post_reloc )
post_reloc_fn->post_reloc ();
}
}
}
INIT_FN ( INIT_RELOCATE, relocate, NULL, NULL );
#endif /* ! KEEP_IT_REAL */

20
src/arch/i386/include/relocate.h
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@ -1,14 +1,24 @@
#ifndef RELOCATE_H
#define RELOCATE_H
#ifdef KEEP_IT_REAL
/* relocate() is conceptually impossible with KEEP_IT_REAL */
#define relocate()
#ifndef KEEP_IT_REAL
#else
/* An entry in the post-relocation function table */
struct post_reloc_fn {
void ( *post_reloc ) ( void );
};
extern void relocate ( void );
/* Use double digits to avoid problems with "10" < "9" on alphabetic sort */
#define POST_RELOC_LIBRM "00"
/* Macro for creating a post-relocation function table entry */
#define POST_RELOC_FN( post_reloc_order, post_reloc_func ) \
static struct post_reloc_fn post_reloc_functions \
__attribute__ (( used, __section__( ".post_reloc_fns." \
post_reloc_order ) )) = { \
.post_reloc = post_reloc_func, \
};
#endif

5
src/arch/i386/scripts/i386.lds
View File

@ -140,6 +140,8 @@ SECTIONS {
__data = .;
*(.data)
*(.data.*)
/* Various tables */
pci_drivers = .;
*(.drivers.pci)
pci_drivers_end = .;
@ -149,6 +151,9 @@ SECTIONS {
console_drivers = .;
*(.drivers.console)
console_drivers_end = .;
post_reloc_fns = .;
*(SORT(.post_reloc_fns.*))
post_reloc_fns_end = .;
init_fns = .;
*(SORT(.init_fns.*))
init_fns_end = .;