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authorAlexander Graf <agraf@suse.de>2016-04-11 23:51:01 +0200
committerTom Rini <trini@konsulko.com>2016-04-18 17:11:40 -0400
commitad0c1a3d2cea03011091b07e9e066bf261d1556e (patch)
tree87993cec46ca147be4dd3fef017dd2e049e0375f /cmd
parent36c37a8481551a6958fd91ccafc6936bf81e00f3 (diff)
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efi_loader: Put fdt into convenient location
The uEFI spec doesn't dictate where the device tree should live at, but legacy 32bit ARM grub2 has some assumptions that it may stay at its place when it's already loaded by the firmware. So let's put it somewhere where Linux that comes after would happily find it - around the recommended 128MB line. Signed-off-by: Alexander Graf <agraf@suse.de> Tested-by: Andreas Färber <afaerber@suse.de>
Diffstat (limited to 'cmd')
-rw-r--r--cmd/bootefi.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/cmd/bootefi.c b/cmd/bootefi.c
index 9b8af65..b213ef1 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -12,7 +12,7 @@
#include <errno.h>
#include <libfdt.h>
#include <libfdt_env.h>
-#include <malloc.h>
+#include <memalign.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -104,12 +104,34 @@ static struct efi_object bootefi_device_obj = {
static void *copy_fdt(void *fdt)
{
u64 fdt_size = fdt_totalsize(fdt);
+ unsigned long fdt_ram_start = -1L, fdt_pages;
+ u64 new_fdt_addr;
void *new_fdt;
+ int i;
- /* Give us 64kb breathing room */
- fdt_size += 64 * 1024;
+ for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
+ u64 ram_start = gd->bd->bi_dram[i].start;
+ u64 ram_size = gd->bd->bi_dram[i].size;
- new_fdt = malloc(fdt_size);
+ if (!ram_size)
+ continue;
+
+ if (ram_start < fdt_ram_start)
+ fdt_ram_start = ram_start;
+ }
+
+ /* Give us at least 4kb breathing room */
+ fdt_size = ALIGN(fdt_size + 4096, 4096);
+ fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
+
+ /* Safe fdt location is at 128MB */
+ new_fdt_addr = fdt_ram_start + (128 * 1024 * 1024) + fdt_size;
+ if (efi_allocate_pages(1, EFI_BOOT_SERVICES_DATA, fdt_pages,
+ &new_fdt_addr) != EFI_SUCCESS) {
+ /* If we can't put it there, put it somewhere */
+ new_fdt_addr = (ulong)memalign(4096, fdt_size);
+ }
+ new_fdt = (void*)(ulong)new_fdt_addr;
memcpy(new_fdt, fdt, fdt_totalsize(fdt));
fdt_set_totalsize(new_fdt, fdt_size);