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Merge Perforce change @219948 to head:

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Add code so that the BERI boot process can ask the kernel linker for
  DTB blobs that may have been left for it by the boot loader, as done
  on PowerPC and ARM.  This will require both a more mature boot
  loader, and more mature boot loader argument passing mechanism,
  than currently supported on BERI.

Sponsored by:	DARPA, AFRL
This commit is contained in:
rwatson 2013-01-12 13:20:21 +00:00
parent fe7ea72483
commit 9a5b2389dd
2 changed files with 25 additions and 2 deletions
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26
sys/mips/beri/beri_machdep.c
View File

@ -45,6 +45,7 @@ __FBSDID("$FreeBSD$");
#include <sys/cpu.h>
#include <sys/cons.h>
#include <sys/exec.h>
#include <sys/linker.h>
#include <sys/ucontext.h>
#include <sys/proc.h>
#include <sys/kdb.h>
@ -70,6 +71,7 @@ __FBSDID("$FreeBSD$");
#include <machine/cpuregs.h>
#include <machine/hwfunc.h>
#include <machine/md_var.h>
#include <machine/metadata.h>
#include <machine/pmap.h>
#include <machine/trap.h>
@ -135,6 +137,10 @@ platform_start(__register_t a0, __register_t a1, __register_t a2,
char **argv = (char **)a1;
char **envp = (char **)a2;
unsigned int memsize = a3;
#ifdef FDT
vm_offset_t dtbp;
void *kmdp;
#endif
int i;
/* clear the BSS and SBSS segments */
@ -146,8 +152,24 @@ platform_start(__register_t a0, __register_t a1, __register_t a2,
mips_pcpu0_init();
#ifdef FDT
#ifndef FDT_DTB_STATIC
#error "mips_init with FDT requires FDT_DTB_STATIC"
/*
* Find the dtb passed in by the boot loader (currently fictional).
*/
kmdp = preload_search_by_type("elf kernel");
if (kmdp != NULL)
dtbp = MD_FETCH(kmdp, MODINFOMD_DTBP, vm_offset_t);
else
dtbp = (vm_offset_t)NULL;
#if defined(FDT_DTB_STATIC)
/*
* In case the device tree blob was not retrieved (from metadata) try
* to use the statically embedded one.
*/
if (dtbp == (vm_offset_t)NULL)
dtbp = (vm_offset_t)&fdt_static_dtb;
#else
#error "Non-static FDT not yet supported on BERI"
#endif
if (OF_install(OFW_FDT, 0) == FALSE)

1
sys/mips/include/metadata.h
View File

@ -30,5 +30,6 @@
#define _MACHINE_METADATA_H_
#define MODINFOMD_SMAP 0x1001
#define MODINFOMD_DTBP 0x1002
#endif /* !_MACHINE_METADATA_H_ */