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stub: various modernizations to linux.c

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Let's make some stuff const. Most importanly call AllocatePages() with
a pointer to an EFI_PHYSICAL_ADDRESS instead of a pointer to a
pointer. On 64bit this makes no difference, but on i386 this is simply
not correct, since EFI_PHYSICAL_ADDRESS is 64bit there, even though
pointers are 32bit.
This commit is contained in:
Lennart Poettering 2021-09-21 22:00:06 +02:00
parent a0a644be70
commit 0d43ce5266
1 changed files with 23 additions and 11 deletions
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34
src/boot/efi/linux.c
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@ -13,6 +13,7 @@
#endif
typedef VOID(*handover_f)(VOID *image, EFI_SYSTEM_TABLE *table, struct boot_params *params) __regparm0__;
static VOID linux_efi_handover(EFI_HANDLE image, struct boot_params *params) {
handover_f handover;
UINTN start = (UINTN)params->hdr.code32_start;
@ -31,16 +32,17 @@ EFI_STATUS linux_exec(EFI_HANDLE image,
CHAR8 *cmdline, UINTN cmdline_len,
UINTN linux_addr,
UINTN initrd_addr, UINTN initrd_size) {
struct boot_params *image_params;
const struct boot_params *image_params;
struct boot_params *boot_params;
UINT8 setup_sectors;
EFI_PHYSICAL_ADDRESS addr;
UINT8 setup_sectors;
EFI_STATUS err;
assert(image);
assert(cmdline);
image_params = (struct boot_params *) linux_addr;
image_params = (const struct boot_params *) linux_addr;
if (image_params->hdr.boot_flag != 0xAA55 ||
image_params->hdr.header != SETUP_MAGIC ||
@ -48,22 +50,32 @@ EFI_STATUS linux_exec(EFI_HANDLE image,
!image_params->hdr.relocatable_kernel)
return EFI_LOAD_ERROR;
boot_params = (struct boot_params *) 0xFFFFFFFF;
err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
EFI_SIZE_TO_PAGES(0x4000), (EFI_PHYSICAL_ADDRESS*) &boot_params);
addr = UINT32_MAX; /* Below the 32bit boundary */
err = uefi_call_wrapper(
BS->AllocatePages, 4,
AllocateMaxAddress,
EfiLoaderData,
EFI_SIZE_TO_PAGES(0x4000),
&addr);
if (EFI_ERROR(err))
return err;
boot_params = (struct boot_params *) PHYSICAL_ADDRESS_TO_POINTER(addr);
ZeroMem(boot_params, 0x4000);
CopyMem(&boot_params->hdr, &image_params->hdr, sizeof(struct setup_header));
boot_params->hdr = image_params->hdr;
boot_params->hdr.type_of_loader = 0xff;
setup_sectors = image_params->hdr.setup_sects > 0 ? image_params->hdr.setup_sects : 4;
boot_params->hdr.code32_start = (UINT32)linux_addr + (setup_sectors + 1) * 512;
if (cmdline) {
addr = 0xA0000;
err = uefi_call_wrapper(BS->AllocatePages, 4, AllocateMaxAddress, EfiLoaderData,
EFI_SIZE_TO_PAGES(cmdline_len + 1), &addr);
err = uefi_call_wrapper(
BS->AllocatePages, 4,
AllocateMaxAddress,
EfiLoaderData,
EFI_SIZE_TO_PAGES(cmdline_len + 1),
&addr);
if (EFI_ERROR(err))
return err;
@ -72,8 +84,8 @@ EFI_STATUS linux_exec(EFI_HANDLE image,
boot_params->hdr.cmd_line_ptr = (UINT32) addr;
}
boot_params->hdr.ramdisk_image = (UINT32)initrd_addr;
boot_params->hdr.ramdisk_size = (UINT32)initrd_size;
boot_params->hdr.ramdisk_image = (UINT32) initrd_addr;
boot_params->hdr.ramdisk_size = (UINT32) initrd_size;
linux_efi_handover(image, boot_params);
return EFI_LOAD_ERROR;