diff options
Diffstat (limited to 'drivers/firmware/efi/libstub/mem.c')
| -rw-r--r-- | drivers/firmware/efi/libstub/mem.c | 29 |
1 files changed, 20 insertions, 9 deletions
diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c index 94b029965f41..869a79c8946f 100644 --- a/drivers/firmware/efi/libstub/mem.c +++ b/drivers/firmware/efi/libstub/mem.c @@ -230,15 +230,26 @@ void efi_free(unsigned long size, unsigned long addr) efi_bs_call(free_pages, addr, nr_pages); } -/* - * Relocate a kernel image, either compressed or uncompressed. - * In the ARM64 case, all kernel images are currently - * uncompressed, and as such when we relocate it we need to - * allocate additional space for the BSS segment. Any low - * memory that this function should avoid needs to be - * unavailable in the EFI memory map, as if the preferred - * address is not available the lowest available address will - * be used. +/** + * efi_relocate_kernel() - copy memory area + * @image_addr: pointer to address of memory area to copy + * @image_size: size of memory area to copy + * @alloc_size: minimum size of memory to allocate, must be greater or + * equal to image_size + * @preferred_addr: preferred target address + * @alignment: minimum alignment of the allocated memory area. It + * should be a power of two. + * @min_addr: minimum target address + * + * Copy a memory area to a newly allocated memory area aligned according + * to @alignment but at least EFI_ALLOC_ALIGN. If the preferred address + * is not available, the allocated address will not be below @min_addr. + * On exit, @image_addr is updated to the target copy address that was used. + * + * This function is used to copy the Linux kernel verbatim. It does not apply + * any relocation changes. + * + * Return: status code */ efi_status_t efi_relocate_kernel(unsigned long *image_addr, unsigned long image_size, |