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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/boot/compressed/efi_thunk_64.S
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@@ -10,7 +10,7 @@
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  * needs to be able to service interrupts.
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  *
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  * On the plus side, we don't have to worry about mangling 64-bit
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- * addresses into 32-bits because we're executing with an identify
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+ * addresses into 32-bits because we're executing with an identity
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  * mapped pagetable and haven't transitioned to 64-bit virtual addresses
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  * yet.
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  */
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@@ -23,16 +23,11 @@
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 	.code64
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 	.text
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-ENTRY(efi64_thunk)
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+SYM_FUNC_START(__efi64_thunk)
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 	push	%rbp
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 	push	%rbx
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-	subq	$8, %rsp
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-	leaq	efi_exit32(%rip), %rax
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-	movl	%eax, 4(%rsp)
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-	leaq	efi_gdt64(%rip), %rax
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-	movl	%eax, (%rsp)
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-	movl	%eax, 2(%rax)		/* Fixup the gdt base address */
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+	leaq	1f(%rip), %rbp
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31
 
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 	movl	%ds, %eax
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 	push	%rax
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@@ -48,32 +43,32 @@
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 	movl	%esi, 0x0(%rsp)
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 	movl	%edx, 0x4(%rsp)
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 	movl	%ecx, 0x8(%rsp)
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-	movq	%r8, %rsi
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-	movl	%esi, 0xc(%rsp)
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-	movq	%r9, %rsi
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-	movl	%esi,  0x10(%rsp)
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+	movl	%r8d, 0xc(%rsp)
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+	movl	%r9d, 0x10(%rsp)
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48
 
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-	sgdt	save_gdt(%rip)
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-
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-	leaq	1f(%rip), %rbx
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-	movq	%rbx, func_rt_ptr(%rip)
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+	leaq	0x14(%rsp), %rbx
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+	sgdt	(%rbx)
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 	/*
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 	 * Switch to gdt with 32-bit segments. This is the firmware GDT
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 	 * that was installed when the kernel started executing. This
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 	 * pointer was saved at the EFI stub entry point in head_64.S.
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+	 *
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+	 * Pass the saved DS selector to the 32-bit code, and use far return to
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+	 * restore the saved CS selector.
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 	 */
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 	leaq	efi32_boot_gdt(%rip), %rax
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 	lgdt	(%rax)
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-	pushq	$__KERNEL_CS
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+	movzwl	efi32_boot_ds(%rip), %edx
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+	movzwq	efi32_boot_cs(%rip), %rax
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+	pushq	%rax
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 	leaq	efi_enter32(%rip), %rax
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 	pushq	%rax
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 	lretq
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 1:	addq	$32, %rsp
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-
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-	lgdt	save_gdt(%rip)
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+	movq	%rdi, %rax
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 	pop	%rbx
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 	movl	%ebx, %ss
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@@ -81,30 +76,21 @@
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 	movl	%ebx, %es
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 	pop	%rbx
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 	movl	%ebx, %ds
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+	/* Clear out 32-bit selector from FS and GS */
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+	xorl	%ebx, %ebx
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+	movl	%ebx, %fs
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+	movl	%ebx, %gs
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 	/*
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 	 * Convert 32-bit status code into 64-bit.
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 	 */
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-	test	%rax, %rax
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-	jz	1f
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-	movl	%eax, %ecx
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-	andl	$0x0fffffff, %ecx
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-	andl	$0xf0000000, %eax
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-	shl	$32, %rax
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-	or	%rcx, %rax
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-1:
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-	addq	$8, %rsp
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+	roll	$1, %eax
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+	rorq	$1, %rax
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+
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 	pop	%rbx
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 	pop	%rbp
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-	ret
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-ENDPROC(efi64_thunk)
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-
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-ENTRY(efi_exit32)
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-	movq	func_rt_ptr(%rip), %rax
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-	push	%rax
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-	mov	%rdi, %rax
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-	ret
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-ENDPROC(efi_exit32)
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+	RET
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+SYM_FUNC_END(__efi64_thunk)
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 	.code32
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 /*
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@@ -112,11 +98,13 @@
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  *
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  * The stack should represent the 32-bit calling convention.
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  */
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-ENTRY(efi_enter32)
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-	movl	$__KERNEL_DS, %eax
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-	movl	%eax, %ds
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-	movl	%eax, %es
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-	movl	%eax, %ss
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+SYM_FUNC_START_LOCAL(efi_enter32)
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+	/* Load firmware selector into data and stack segment registers */
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+	movl	%edx, %ds
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+	movl	%edx, %es
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+	movl	%edx, %fs
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+	movl	%edx, %gs
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+	movl	%edx, %ss
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 	/* Reload pgtables */
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 	movl	%cr3, %eax
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@@ -144,9 +132,7 @@
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 	 */
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 	cli
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-	movl	56(%esp), %eax
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-	movl	%eax, 2(%eax)
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-	lgdtl	(%eax)
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+	lgdtl	(%ebx)
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 	movl	%cr4, %eax
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 	btsl	$(X86_CR4_PAE_BIT), %eax
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@@ -163,35 +149,27 @@
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 	xorl	%eax, %eax
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 	lldt	%ax
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-	movl	60(%esp), %eax
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 	pushl	$__KERNEL_CS
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-	pushl	%eax
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+	pushl	%ebp
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 	/* Enable paging */
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 	movl	%cr0, %eax
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 	btsl	$X86_CR0_PG_BIT, %eax
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 	movl	%eax, %cr0
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 	lret
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-ENDPROC(efi_enter32)
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+SYM_FUNC_END(efi_enter32)
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 	.data
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 	.balign	8
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-	.global	efi32_boot_gdt
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-efi32_boot_gdt:	.word	0
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-		.quad	0
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-
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-save_gdt:	.word	0
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-		.quad	0
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-func_rt_ptr:	.quad	0
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-
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-	.global efi_gdt64
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-efi_gdt64:
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-	.word	efi_gdt64_end - efi_gdt64
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-	.long	0			/* Filled out by user */
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+SYM_DATA_START(efi32_boot_gdt)
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 	.word	0
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-	.quad	0x0000000000000000	/* NULL descriptor */
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-	.quad	0x00af9a000000ffff	/* __KERNEL_CS */
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-	.quad	0x00cf92000000ffff	/* __KERNEL_DS */
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-	.quad	0x0080890000000000	/* TS descriptor */
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-	.quad   0x0000000000000000	/* TS continued */
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-efi_gdt64_end:
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+	.quad	0
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+SYM_DATA_END(efi32_boot_gdt)
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+
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+SYM_DATA_START(efi32_boot_cs)
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+	.word	0
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+SYM_DATA_END(efi32_boot_cs)
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+
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+SYM_DATA_START(efi32_boot_ds)
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+	.word	0
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+SYM_DATA_END(efi32_boot_ds)