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efi_loader: macro efi_size_in_pages()

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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.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Heinrich Schuchardt 2018-11-18 17:58:49 +01:00 committed by Alexander Graf
parent 42910ff1ba
commit c3772ca1e3
3 changed files with 19 additions and 13 deletions
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15
cmd/bootefi.c
View File

@ -149,7 +149,7 @@ 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
@ -177,14 +177,12 @@ 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;
@ -282,8 +280,7 @@ 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))

11
include/efi_loader.h
View File

@ -344,7 +344,16 @@ 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)
/* 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 */

6
lib/efi_loader/efi_memory.c
View File

@ -397,7 +397,7 @@ 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,
@ -440,8 +440,8 @@ 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;