diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/firmware/efi/efi-stub-helper.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi-stub-helper.c b/drivers/firmware/efi/efi-stub-helper.c index a2567583359..333ed9c3775 100644 --- a/drivers/firmware/efi/efi-stub-helper.c +++ b/drivers/firmware/efi/efi-stub-helper.c @@ -485,3 +485,38 @@ fail: return status; } + +static efi_status_t relocate_kernel(struct setup_header *hdr) +{ + unsigned long start, nr_pages; + efi_status_t status; + + /* + * The EFI firmware loader could have placed the kernel image + * anywhere in memory, but the kernel has various restrictions + * on the max physical address it can run at. Attempt to move + * the kernel to boot_params.pref_address, or as low as + * possible. + */ + start = hdr->pref_address; + nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE; + + status = efi_call_phys4(sys_table->boottime->allocate_pages, + EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA, + nr_pages, &start); + if (status != EFI_SUCCESS) { + status = efi_low_alloc(sys_table, hdr->init_size, + hdr->kernel_alignment, &start); + if (status != EFI_SUCCESS) + efi_printk(sys_table, "Failed to alloc mem for kernel\n"); + } + + if (status == EFI_SUCCESS) + memcpy((void *)start, (void *)(unsigned long)hdr->code32_start, + hdr->init_size); + + hdr->pref_address = hdr->code32_start; + hdr->code32_start = (__u32)start; + + return status; +} |