From: wangyao@lemote.com
To: ardb@kernel.org, chenhuacai@kernel.org, wangrui@loongson.cn
Cc: linux-efi@vger.kernel.org, ainux.wang@gmail.com,
Wang Yao <wangyao@lemote.com>,
Huacai Chen <chenhuacai@loongson.cn>
Subject: [PATCH v4] efi/loongarch: Use load address to calculate kernel entry address
Date: Wed, 6 Dec 2023 08:24:27 +0800 [thread overview]
Message-ID: <20231206002427.25480-1-wangyao@lemote.com> (raw)
From: Wang Yao <wangyao@lemote.com>
The efi_relocate_kernel() may load the PIE kernel to anywhere, the loaded
address may not be equal to link address or EFI_KIMG_PREFERRED_ADDRESS.
Acked-by: Huacai Chen <chenhuacai@loongson.cn>
Signed-off-by: Wang Yao <wangyao@lemote.com>
---
v3->v4:
Add Acked-by: Huacai Chen <chenhuacai@loongson.cn>
v2->v3:
Dropped TO_CACHE:
kernel_addr may be DA/PG address, both access kernel entry.
v1->v2:
Use link address that from DOS header to calculate kernel entry,
corrected by Huacai Chen.
arch/loongarch/include/asm/efi.h | 2 +-
drivers/firmware/efi/libstub/loongarch-stub.c | 4 ++--
drivers/firmware/efi/libstub/loongarch.c | 6 +++---
3 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/loongarch/include/asm/efi.h b/arch/loongarch/include/asm/efi.h
index 091897d40b03..91d81f9730ab 100644
--- a/arch/loongarch/include/asm/efi.h
+++ b/arch/loongarch/include/asm/efi.h
@@ -32,6 +32,6 @@ static inline unsigned long efi_get_kimg_min_align(void)
#define EFI_KIMG_PREFERRED_ADDRESS PHYSADDR(VMLINUX_LOAD_ADDRESS)
-unsigned long kernel_entry_address(void);
+unsigned long kernel_entry_address(unsigned long kernel_addr);
#endif /* _ASM_LOONGARCH_EFI_H */
diff --git a/drivers/firmware/efi/libstub/loongarch-stub.c b/drivers/firmware/efi/libstub/loongarch-stub.c
index 72c71ae201f0..d6ec5d4b8dbe 100644
--- a/drivers/firmware/efi/libstub/loongarch-stub.c
+++ b/drivers/firmware/efi/libstub/loongarch-stub.c
@@ -35,9 +35,9 @@ efi_status_t handle_kernel_image(unsigned long *image_addr,
return status;
}
-unsigned long kernel_entry_address(void)
+unsigned long kernel_entry_address(unsigned long kernel_addr)
{
unsigned long base = (unsigned long)&kernel_offset - kernel_offset;
- return (unsigned long)&kernel_entry - base + VMLINUX_LOAD_ADDRESS;
+ return (unsigned long)&kernel_entry - base + kernel_addr;
}
diff --git a/drivers/firmware/efi/libstub/loongarch.c b/drivers/firmware/efi/libstub/loongarch.c
index 807cba2693fc..0e0aa6cda73f 100644
--- a/drivers/firmware/efi/libstub/loongarch.c
+++ b/drivers/firmware/efi/libstub/loongarch.c
@@ -37,9 +37,9 @@ static efi_status_t exit_boot_func(struct efi_boot_memmap *map, void *priv)
return EFI_SUCCESS;
}
-unsigned long __weak kernel_entry_address(void)
+unsigned long __weak kernel_entry_address(unsigned long kernel_addr)
{
- return *(unsigned long *)(PHYSADDR(VMLINUX_LOAD_ADDRESS) + 8);
+ return *(unsigned long *)(kernel_addr + 8) - VMLINUX_LOAD_ADDRESS + kernel_addr;
}
efi_status_t efi_boot_kernel(void *handle, efi_loaded_image_t *image,
@@ -73,7 +73,7 @@ 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();
+ real_kernel_entry = (void *)kernel_entry_address(kernel_addr);
real_kernel_entry(true, (unsigned long)cmdline_ptr,
(unsigned long)efi_system_table);
--
2.27.0
next reply other threads:[~2023-12-06 0:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-06 0:24 wangyao [this message]
2023-12-07 16:08 ` [PATCH v4] efi/loongarch: Use load address to calculate kernel entry address Ard Biesheuvel
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