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efi/loongarch: Directly position the loaded image file

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The use of the 'kernel_offset' variable to position the image file that
has been loaded by UEFI or GRUB is unnecessary, because we can directly
position the loaded image file through using the image_base field of the
efi_loaded_image struct provided by UEFI.

Replace kernel_offset with image_base to position the image file that has
been loaded by UEFI or GRUB.

Signed-off-by: Wang Yao <wangyao@lemote.com>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Wang Yao 2023-12-19 17:14:05 +08:00 committed by Ard Biesheuvel
parent a42da7f0f9
commit 174a0c565c
7 changed files with 13 additions and 11 deletions
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2
arch/loongarch/include/asm/efi.h
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@ -32,6 +32,4 @@ static inline unsigned long efi_get_kimg_min_align(void)
#define EFI_KIMG_PREFERRED_ADDRESS PHYSADDR(VMLINUX_LOAD_ADDRESS)
unsigned long kernel_entry_address(unsigned long kernel_addr);
#endif /* _ASM_LOONGARCH_EFI_H */

1
arch/loongarch/kernel/head.S
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@ -34,7 +34,6 @@ pe_header:
SYM_DATA(kernel_asize, .long _kernel_asize);
SYM_DATA(kernel_fsize, .long _kernel_fsize);
SYM_DATA(kernel_offset, .long _kernel_offset);
#endif

1
arch/loongarch/kernel/image-vars.h
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@ -11,7 +11,6 @@ __efistub_strcmp = strcmp;
__efistub_kernel_entry = kernel_entry;
__efistub_kernel_asize = kernel_asize;
__efistub_kernel_fsize = kernel_fsize;
__efistub_kernel_offset = kernel_offset;
#if defined(CONFIG_EFI_EARLYCON) || defined(CONFIG_SYSFB)
__efistub_screen_info = screen_info;
#endif

1
arch/loongarch/kernel/vmlinux.lds.S
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@ -143,7 +143,6 @@ SECTIONS
_kernel_fsize = _edata - _text;
_kernel_vsize = _end - __initdata_begin;
_kernel_rsize = _edata - __initdata_begin;
_kernel_offset = kernel_offset - _text;
#endif
.gptab.sdata : {

9
drivers/firmware/efi/libstub/loongarch-stub.c
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@ -8,10 +8,10 @@
#include <asm/efi.h>
#include <asm/addrspace.h>
#include "efistub.h"
#include "loongarch-stub.h"
extern int kernel_asize;
extern int kernel_fsize;
extern int kernel_offset;
extern int kernel_entry;
efi_status_t handle_kernel_image(unsigned long *image_addr,
@ -24,7 +24,7 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
efi_status_t status;
unsigned long kernel_addr = 0;
kernel_addr = (unsigned long)&kernel_offset - kernel_offset;
kernel_addr = (unsigned long)image->image_base;
status = efi_relocate_kernel(&kernel_addr, kernel_fsize, kernel_asize,
EFI_KIMG_PREFERRED_ADDRESS, efi_get_kimg_min_align(), 0x0);
@ -35,9 +35,10 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
return status;
}
unsigned long kernel_entry_address(unsigned long kernel_addr)
unsigned long kernel_entry_address(unsigned long kernel_addr,
efi_loaded_image_t *image)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
unsigned long base = (unsigned long)image->image_base;
return (unsigned long)&kernel_entry - base + kernel_addr;
}

4
drivers/firmware/efi/libstub/loongarch-stub.h Normal file
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@ -0,0 +1,4 @@
/* SPDX-License-Identifier: GPL-2.0-only */
unsigned long kernel_entry_address(unsigned long kernel_addr,
efi_loaded_image_t *image);

6
drivers/firmware/efi/libstub/loongarch.c
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@ -8,6 +8,7 @@
#include <asm/efi.h>
#include <asm/addrspace.h>
#include "efistub.h"
#include "loongarch-stub.h"
typedef void __noreturn (*kernel_entry_t)(bool efi, unsigned long cmdline,
unsigned long systab);
@ -37,7 +38,8 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
return EFI_SUCCESS;
}
unsigned long __weak kernel_entry_address(unsigned long kernel_addr)
unsigned long __weak kernel_entry_address(unsigned long kernel_addr,
efi_loaded_image_t *image)
{
return *(unsigned long *)(kernel_addr + 8) - VMLINUX_LOAD_ADDRESS + kernel_addr;
}
@ -73,7 +75,7 @@ efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
csr_write64(CSR_DMW0_INIT, LOONGARCH_CSR_DMWIN0);
csr_write64(CSR_DMW1_INIT, LOONGARCH_CSR_DMWIN1);
real_kernel_entry = (void *)kernel_entry_address(kernel_addr);
real_kernel_entry = (void *)kernel_entry_address(kernel_addr, image);
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);