tg = (read_cpuid(ID_AA64MMFR0_EL1) >> ID_AA64MMFR0_TGRAN_SHIFT) & 0xf;
if (tg != ID_AA64MMFR0_TGRAN_SUPPORTED) {
if (IS_ENABLED(CONFIG_ARM64_64K_PAGES))
- pr_efi_err("This 64 KB granular kernel is not supported by your CPU\n");
+ efi_err("This 64 KB granular kernel is not supported by your CPU\n");
else
- pr_efi_err("This 16 KB granular kernel is not supported by your CPU\n");
+ efi_err("This 16 KB granular kernel is not supported by your CPU\n");
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
+/*
+ * Relocatable kernels can fix up the misalignment with respect to
+ * MIN_KIMG_ALIGN, so they only require a minimum alignment of EFI_KIMG_ALIGN
+ * (which accounts for the alignment of statically allocated objects such as
+ * the swapper stack.)
+ */
+static const u64 min_kimg_align = IS_ENABLED(CONFIG_RELOCATABLE) ? EFI_KIMG_ALIGN
+ : MIN_KIMG_ALIGN;
+
efi_status_t handle_kernel_image(unsigned long *image_addr,
unsigned long *image_size,
unsigned long *reserve_addr,
{
efi_status_t status;
unsigned long kernel_size, kernel_memsize = 0;
- unsigned long preferred_offset;
- u64 phys_seed = 0;
+ u32 phys_seed = 0;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE)) {
- if (!nokaslr()) {
+ if (!efi_nokaslr) {
status = efi_get_random_bytes(sizeof(phys_seed),
(u8 *)&phys_seed);
if (status == EFI_NOT_FOUND) {
- pr_efi("EFI_RNG_PROTOCOL unavailable, no randomness supplied\n");
+ efi_info("EFI_RNG_PROTOCOL unavailable, no randomness supplied\n");
} else if (status != EFI_SUCCESS) {
- pr_efi_err("efi_get_random_bytes() failed\n");
+ efi_err("efi_get_random_bytes() failed\n");
return status;
}
} else {
- pr_efi("KASLR disabled on kernel command line\n");
+ efi_info("KASLR disabled on kernel command line\n");
}
}
- /*
- * The preferred offset of the kernel Image is TEXT_OFFSET bytes beyond
- * a 2 MB aligned base, which itself may be lower than dram_base, as
- * long as the resulting offset equals or exceeds it.
- */
- preferred_offset = round_down(dram_base, MIN_KIMG_ALIGN) + TEXT_OFFSET;
- if (preferred_offset < dram_base)
- preferred_offset += MIN_KIMG_ALIGN;
+ if (image->image_base != _text)
+ efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
kernel_size = _edata - _text;
kernel_memsize = kernel_size + (_end - _edata);
+ *reserve_size = kernel_memsize + TEXT_OFFSET % min_kimg_align;
if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && phys_seed != 0) {
- /*
- * Produce a displacement in the interval [0, MIN_KIMG_ALIGN)
- * that doesn't violate this kernel's de-facto alignment
- * constraints.
- */
- u32 mask = (MIN_KIMG_ALIGN - 1) & ~(EFI_KIMG_ALIGN - 1);
- u32 offset = (phys_seed >> 32) & mask;
-
- /*
- * With CONFIG_RANDOMIZE_TEXT_OFFSET=y, TEXT_OFFSET may not
- * be a multiple of EFI_KIMG_ALIGN, and we must ensure that
- * we preserve the misalignment of 'offset' relative to
- * EFI_KIMG_ALIGN so that statically allocated objects whose
- * alignment exceeds PAGE_SIZE appear correctly aligned in
- * memory.
- */
- offset |= TEXT_OFFSET % EFI_KIMG_ALIGN;
-
/*
* If KASLR is enabled, and we have some randomness available,
* locate the kernel at a randomized offset in physical memory.
*/
- *reserve_size = kernel_memsize + offset;
- status = efi_random_alloc(*reserve_size,
- MIN_KIMG_ALIGN, reserve_addr,
- (u32)phys_seed);
-
- *image_addr = *reserve_addr + offset;
+ status = efi_random_alloc(*reserve_size, min_kimg_align,
+ reserve_addr, phys_seed);
} else {
- /*
- * Else, try a straight allocation at the preferred offset.
- * This will work around the issue where, if dram_base == 0x0,
- * efi_low_alloc() refuses to allocate at 0x0 (to prevent the
- * address of the allocation to be mistaken for a FAIL return
- * value or a NULL pointer). It will also ensure that, on
- * platforms where the [dram_base, dram_base + TEXT_OFFSET)
- * interval is partially occupied by the firmware (like on APM
- * Mustang), we can still place the kernel at the address
- * 'dram_base + TEXT_OFFSET'.
- */
- *image_addr = (unsigned long)_text;
- if (*image_addr == preferred_offset)
- return EFI_SUCCESS;
-
- *image_addr = *reserve_addr = preferred_offset;
- *reserve_size = round_up(kernel_memsize, EFI_ALLOC_ALIGN);
-
- status = efi_bs_call(allocate_pages, EFI_ALLOCATE_ADDRESS,
- EFI_LOADER_DATA,
- *reserve_size / EFI_PAGE_SIZE,
- (efi_physical_addr_t *)reserve_addr);
+ status = EFI_OUT_OF_RESOURCES;
}
if (status != EFI_SUCCESS) {
- *reserve_size = kernel_memsize + TEXT_OFFSET;
- status = efi_low_alloc(*reserve_size,
- MIN_KIMG_ALIGN, reserve_addr);
+ if (IS_ALIGNED((u64)_text - TEXT_OFFSET, min_kimg_align)) {
+ /*
+ * Just execute from wherever we were loaded by the
+ * UEFI PE/COFF loader if the alignment is suitable.
+ */
+ *image_addr = (u64)_text;
+ *reserve_size = 0;
+ return EFI_SUCCESS;
+ }
+
+ status = efi_allocate_pages_aligned(*reserve_size, reserve_addr,
+ ULONG_MAX, min_kimg_align);
if (status != EFI_SUCCESS) {
- pr_efi_err("Failed to relocate kernel\n");
+ efi_err("Failed to relocate kernel\n");
*reserve_size = 0;
return status;
}
- *image_addr = *reserve_addr + TEXT_OFFSET;
}
- if (image->image_base != _text)
- pr_efi_err("FIRMWARE BUG: efi_loaded_image_t::image_base has bogus value\n");
-
+ *image_addr = *reserve_addr + TEXT_OFFSET % min_kimg_align;
memcpy((void *)*image_addr, _text, kernel_size);
return EFI_SUCCESS;
projects / thirdparty / linux.git / blobdiff