X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=arch%2Fx86%2Fcpu%2Fstart.S;h=e94ddc45ddb78475eefa3e306b9f352d1f378755;hb=f0c7d9c74642ccd6c76993b721b0fb87aab685fa;hp=7ef8b880ec600971207ad33caed4208b36c6cdc5;hpb=da3a95d60bb4476776126f453a0dc2c522d5d711;p=u-boot

diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index 7ef8b880ec..e94ddc45dd 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -41,17 +41,32 @@ _x86boot_start:
 	wbinvd
 
 	/* Tell 32-bit code it is being entered from an in-RAM copy */
-	movw	$GD_FLG_WARM_BOOT, %bx
+	movl	$GD_FLG_WARM_BOOT, %ebx
+
+	/*
+	 * Zero the BIST (Built-In Self Test) value since we don't have it.
+	 * It must be 0 or the previous loader would have reported an error.
+	 */
+	movl	$0, %ebp
+
 	jmp	1f
+
+	/* Add a way for tools to discover the _start entry point */
+	.align	4
+	.long	0x12345678
 _start:
 	/*
 	 * This is the 32-bit cold-reset entry point, coming from start16.
-	 * Set %bx to 0 to indicate this.
+	 * Set %ebx to GD_FLG_COLD_BOOT to indicate this.
 	 */
-	movw	$GD_FLG_COLD_BOOT, %bx
-1:
+	movl	$GD_FLG_COLD_BOOT, %ebx
+
 	/* Save BIST */
 	movl	%eax, %ebp
+1:
+
+	/* Save table pointer */
+	movl	%ecx, %esi
 
 	/* Load the segement registers to match the GDT loaded in start16.S */
 	movl	$(X86_GDT_ENTRY_32BIT_DS * X86_GDT_ENTRY_SIZE), %eax
@@ -89,8 +104,7 @@ car_init_ret:
 	 *
 	 * top-> CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE
 	 *	MRC area
-	 *	global_data
-	 *	x86 global descriptor table
+	 *	global_data with x86 global descriptor table
 	 *	early malloc area
 	 *	stack
 	 * bottom-> CONFIG_SYS_CAR_ADDR
@@ -105,58 +119,35 @@ car_init_ret:
 	 * and esi holds the HOB list address returned by the FSP.
 	 */
 #endif
+	/* Set up global data */
+	mov	%esp, %eax
+	call	board_init_f_mem
+	mov	%eax, %esp
 
-	/* Reserve space on stack for global data */
-	subl	$GENERATED_GBL_DATA_SIZE, %esp
-
-	/* Align global data to 16-byte boundary */
-	andl	$0xfffffff0, %esp
-	post_code(POST_START_STACK)
-
-	/* Zero the global data since it won't happen later */
-	xorl	%eax, %eax
-	movl	$GENERATED_GBL_DATA_SIZE, %ecx
-	movl	%esp, %edi
-	rep	stosb
+	/*
+	 * Debug UART is available here although it may not be plumbed out
+	 * to pins depending on the board. To use it:
+	 *
+	 * call  debug_uart_init
+	 * mov   $'a', %eax
+	 * call  printch
+	 */
 
+	/* Get address of global_data */
+	mov	%fs:0, %edx
 #ifdef CONFIG_HAVE_FSP
+	/* Store the HOB list if we have one */
 	test	%esi, %esi
 	jz	skip_hob
-
-	/* Store HOB list */
-	movl	%esp, %edx
-	addl	$GD_HOB_LIST, %edx
-	movl	%esi, (%edx)
+	movl	%esi, GD_HOB_LIST(%edx)
 
 skip_hob:
+#else
+	/* Store table pointer */
+	movl	%esi, GD_TABLE(%edx)
 #endif
-	/* Setup first parameter to setup_gdt, pointer to global_data */
-	movl	%esp, %eax
-
-	/* Reserve space for global descriptor table */
-	subl	$X86_GDT_SIZE, %esp
-
-	/* Align temporary global descriptor table to 16-byte boundary */
-	andl	$0xfffffff0, %esp
-	movl	%esp, %ecx
-
-#if defined(CONFIG_SYS_MALLOC_F_LEN)
-	/* Set up the pre-relocation malloc pool */
-	subl	$CONFIG_SYS_MALLOC_F_LEN, %esp
-	movl	%eax, %edx
-	addl	$GD_MALLOC_BASE, %edx
-	movl	%esp, (%edx)
-#endif
-	/* Store BIST into global_data */
-	movl	%eax, %edx
-	addl	$GD_BIST, %edx
-	movl	%ebp, (%edx)
-
-	/* Set second parameter to setup_gdt() */
-	movl	%ecx, %edx
-
-	/* Setup global descriptor table so gd->xyz works */
-	call	setup_gdt
+	/* Store BIST */
+	movl	%ebp, GD_BIST(%edx)
 
 	/* Set parameter to board_init_f() to boot flags */
 	post_code(POST_START_DONE)
@@ -183,37 +174,7 @@ board_init_f_r_trampoline:
 	/* Stack grows down from top of SDRAM */
 	movl	%eax, %esp
 
-	/* Reserve space on stack for global data */
-	subl	$GENERATED_GBL_DATA_SIZE, %esp
-
-	/* Align global data to 16-byte boundary */
-	andl	$0xfffffff0, %esp
-
-	/* Setup first parameter to memcpy() and setup_gdt() */
-	movl	%esp, %eax
-
-	/* Setup second parameter to memcpy() */
-	fs movl 0, %edx
-
-	/* Set third parameter to memcpy() */
-	movl	$GENERATED_GBL_DATA_SIZE, %ecx
-
-	/* Copy global data from CAR to SDRAM stack */
-	call	memcpy
-
-	/* Reserve space for global descriptor table */
-	subl	$X86_GDT_SIZE, %esp
-
-	/* Align global descriptor table to 16-byte boundary */
-	andl	$0xfffffff0, %esp
-
-	/* Set second parameter to setup_gdt() */
-	movl	%esp, %edx
-
-	/* Setup global descriptor table so gd->xyz works */
-	call	setup_gdt
-
-	/* Set if we need to disable CAR */
+	/* See if we need to disable CAR */
 .weak	car_uninit
 	movl	$car_uninit, %eax
 	cmpl	$0, %eax