On 12.11.18 18:55, Heinrich Schuchardt wrote:
> When allocating EFI memory pages the size in bytes has to be converted to
> pages.
>
> Provide a macro efi_size_in_pages() for this conversion.
> Use it in the EFI subsystem and correct related comments.
>
> Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
> ---
> v2:
> no change
> ---
> cmd/bootefi.c | 15 ++++++---------
> include/efi_loader.h | 11 ++++++++++-
> lib/efi_loader/efi_memory.c | 6 +++---
> 3 files changed, 19 insertions(+), 13 deletions(-)
>
> diff --git a/cmd/bootefi.c b/cmd/bootefi.c
> index c73e6228d3e..2c9b2eb8b6f 100644
> --- a/cmd/bootefi.c
> +++ b/cmd/bootefi.c
> @@ -154,7 +154,7 @@ static void set_load_options(struct efi_loaded_image
> *loaded_image_info,
> * copy_fdt() - Copy the device tree to a new location available to EFI
> *
> * The FDT is relocated into a suitable location within the EFI memory map.
> - * An additional 12KB is added to the space in case the device tree needs to
> be
> + * Additional 12 KiB are added to the space in case the device tree needs to
> be
> * expanded later with fdt_open_into().
> *
> * @fdt_addr: On entry, address of start of FDT. On exit, address of
> relocated
> @@ -182,14 +182,12 @@ static efi_status_t copy_fdt(ulong *fdt_addrp)
> }
>
> /*
> - * Give us at least 4KB of breathing room in case the device tree needs
> - * to be expanded later. Round up to the nearest EFI page boundary.
> + * Give us at least 12 KiB of breathing room in case the device tree
> + * needs to be expanded later.
> */
> fdt = map_sysmem(*fdt_addrp, 0);
> - fdt_size = fdt_totalsize(fdt);
> - fdt_size += 4096 * 3;
> - fdt_size = ALIGN(fdt_size + EFI_PAGE_SIZE - 1, EFI_PAGE_SIZE);
> - fdt_pages = fdt_size >> EFI_PAGE_SHIFT;
> + fdt_pages = efi_size_in_pages(fdt_totalsize(fdt) + 0x3000);
> + fdt_size = fdt_pages << EFI_PAGE_SHIFT;
>
> /* Safe fdt location is at 127MB */
> new_fdt_addr = fdt_ram_start + (127 * 1024 * 1024) + fdt_size;
> @@ -287,8 +285,7 @@ static void efi_carve_out_dt_rsv(void *fdt)
> if (addr == (uintptr_t)fdt)
> continue;
>
> - pages = ALIGN(size + (addr & EFI_PAGE_MASK), EFI_PAGE_SIZE) >>
> - EFI_PAGE_SHIFT;
> + pages = efi_size_in_pages(size + (addr & EFI_PAGE_MASK));
> addr &= ~EFI_PAGE_MASK;
> if (!efi_add_memory_map(addr, pages, EFI_RESERVED_MEMORY_TYPE,
> false))
> diff --git a/include/efi_loader.h b/include/efi_loader.h
> index bdb806cfce4..244e754e8fd 100644
> --- a/include/efi_loader.h
> +++ b/include/efi_loader.h
> @@ -350,7 +350,16 @@ struct efi_simple_file_system_protocol
> *efi_simple_file_system(
> /* open file from device-path: */
> struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
>
> -
> +/**
> + * efi_size_in_pages() - convert size in bytes to size in pages
> + *
> + * This macro returns the number of EFI memory pages required to hold 'size'
> + * bytes.
> + *
> + * @size: size in bytes
> + * Return: size in pages
> + */
> +#define efi_size_in_pages(size) ((size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
Please make this a static inline function instead so we preserve type
checks.
Alex
> /* Generic EFI memory allocator, call this to get memory */
> void *efi_alloc(uint64_t len, int memory_type);
> /* More specific EFI memory allocator, called by EFI payloads */
> diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
> index 490e4921cce..5c387fa8024 100644
> --- a/lib/efi_loader/efi_memory.c
> +++ b/lib/efi_loader/efi_memory.c
> @@ -400,7 +400,7 @@ efi_status_t efi_allocate_pages(int type, int memory_type,
> void *efi_alloc(uint64_t len, int memory_type)
> {
> uint64_t ret = 0;
> - uint64_t pages = (len + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
> + uint64_t pages = efi_size_in_pages(len);
> efi_status_t r;
>
> r = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, memory_type, pages,
> @@ -444,8 +444,8 @@ efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t
> size, void **buffer)
> {
> efi_status_t r;
> struct efi_pool_allocation *alloc;
> - u64 num_pages = (size + sizeof(struct efi_pool_allocation) +
> - EFI_PAGE_MASK) >> EFI_PAGE_SHIFT;
> + u64 num_pages = efi_size_in_pages(size +
> + sizeof(struct efi_pool_allocation));
>
> if (!buffer)
> return EFI_INVALID_PARAMETER;
>
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