x86: fsp: Simplify fsp_continue()

There is no need to pass shared_data to fsp_continue() so we can
remove unnecessary codes that simplifies the function a lot.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

arch/x86/include/asm/fsp/fsp_support.h

@@ -49,14 +49,12 @@ void fsp_init_done(void *hob_list);
 /**
  * FSP Continuation function
  *
- * @shared_data: Shared data base before stack migration
  * @status:      Always 0
  * @hob_list:    HOB list pointer
  *
  * @retval:      Never returns
  */
-void fsp_continue(struct shared_data *shared_data, u32 status,
-		  void *hob_list);
+void fsp_continue(u32 status, void *hob_list);
 
 /**
  * Find FSP header offset in FSP image

arch/x86/lib/fsp/fsp_support.c

@@ -87,28 +87,12 @@ struct fsp_header *__attribute__((optimize("O0"))) find_fsp_header(void)
 	return (struct fsp_header *)fsp;
 }
 
-void fsp_continue(struct shared_data *shared_data, u32 status, void *hob_list)
+void fsp_continue(u32 status, void *hob_list)
 {
-	u32 stack_len;
-	u32 stack_base;
-	u32 stack_top;
-
 	post_code(POST_MRC);
 
 	assert(status == 0);
 
-	/* Get the migrated stack in normal memory */
-	stack_base = (u32)fsp_get_bootloader_tmp_mem(hob_list, &stack_len);
-	assert(stack_base != 0);
-	stack_top  = stack_base + stack_len - sizeof(u32);
-
-	/*
-	 * Old stack base is stored at the very end of the stack top,
-	 * use it to calculate the migrated shared data base
-	 */
-	shared_data = (struct shared_data *)(stack_base +
-			((u32)shared_data - *(u32 *)stack_top));
-
 	/* The boot loader main function entry */
 	fsp_init_done(hob_list);
 }
@@ -176,19 +160,18 @@ void fsp_init(u32 stack_top, u32 boot_mode, void *nvs_buf)
 	setup_fsp_gdt();
 
 	/*
-	 * Use ASM code to ensure the register value in EAX & ECX
-	 * will be passed into BlContinuationFunc
+	 * Use ASM code to ensure the register value in EAX & EDX
+	 * will be passed into fsp_continue
 	 */
 	asm volatile (
 		"pushl	%0;"
 		"call	*%%eax;"
 		".global asm_continuation;"
 		"asm_continuation:;"
-		"movl	%%ebx, %%eax;"		/* shared_data */
-		"movl	4(%%esp), %%edx;"	/* status */
-		"movl	8(%%esp), %%ecx;"	/* hob_list */
+		"movl	4(%%esp), %%eax;"	/* status */
+		"movl	8(%%esp), %%edx;"	/* hob_list */
 		"jmp	fsp_continue;"
-		: : "m"(params_ptr), "a"(init), "b"(&shared_data)
+		: : "m"(params_ptr), "a"(init)
 	);
 
 	/*