linux-kernel - [PATCH v1 3/3] efi/efistub: Make libstub to supply boot

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Message-ID: <20250623081656.1303-1-khaliidcaliy@gmail.com>
Date: Mon, 23 Jun 2025 08:16:39 +0000
From: Khalid Ali <khaliidcaliy@...il.com>
To: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	ubizjak@...il.com
Cc: x86@...nel.org,
	hpa@...or.com,
	linux-efi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Khalid Ali <khaliidcaliy@...il.com>
Subject: [PATCH v1 3/3] efi/efistub: Make libstub to supply boot_param from RDI

From: Khalid Ali <khaliidcaliy@...il.com>

This adjusts the libstub to supply argument from RDI instead of RSI.

Signed-off-by: Khalid Ali <khaliidcaliy@...il.com>
---
 drivers/firmware/efi/libstub/x86-stub.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index 09ed1c122106..9da9b6295b1d 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -794,8 +794,8 @@ static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry,
 static void __noreturn enter_kernel(unsigned long kernel_addr,
 				    struct boot_params *boot_params)
 {
-	/* enter decompressed kernel with boot_params pointer in RSI/ESI */
-	asm("jmp *%0"::"r"(kernel_addr), "S"(boot_params));
+	/* enter decompressed kernel with boot_params pointer in RDI/EDI */
+	asm("jmp *%0"::"r"(kernel_addr), "D"(boot_params));
 
 	unreachable();
 }
-- 
2.49.0