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From: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/6] spl: arm: implement SPL_CLEAR_BSS_F
Date: Mon, 11 Mar 2019 22:35:20 +0100	[thread overview]
Message-ID: <20190311213524.15893-3-simon.k.r.goldschmidt@gmail.com> (raw)
In-Reply-To: <20190311213524.15893-1-simon.k.r.goldschmidt@gmail.com>

This implements the new option to clear BSS early in SPL for standard arm
crt0.

BSS is cleared before calling board_init_f() and thus not cleared before
calling board_init_r() as it is not relocated in SPL.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
---

 arch/arm/lib/crt0.S | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/arch/arm/lib/crt0.S b/arch/arm/lib/crt0.S
index fe312db690..b06e54e144 100644
--- a/arch/arm/lib/crt0.S
+++ b/arch/arm/lib/crt0.S
@@ -80,6 +80,26 @@ ENTRY(_main)
 	mov	r9, r0
 	bl	board_init_f_init_reserve
 
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_CLEAR_BSS_F)
+	ldr	r0, =__bss_start
+
+#ifdef CONFIG_USE_ARCH_MEMSET
+	ldr	r3, =__bss_end
+	mov	r1, #0x00000000		/* prepare zero to clear BSS */
+
+	subs	r2, r3, r0		/* r2 = memset len */
+	bl	memset
+#else
+	ldr	r1, =__bss_end
+	mov	r2, #0x00000000		/* prepare zero to clear BSS */
+
+clbss_l:cmp	r0, r1			/* while not at end of BSS */
+	strlo	r2, [r0]		/* clear 32-bit BSS word */
+	addlo	r0, r0, #4		/* move to next */
+	blo	clbss_l
+#endif
+#endif
+
 	mov	r0, #0
 	bl	board_init_f
 
@@ -124,6 +144,7 @@ here:
 	movne	sp, r0
 	movne	r9, r0
 # endif
+#if !defined(CONFIG_SPL_BUILD) || !defined(CONFIG_SPL_CLEAR_BSS_F)
 	ldr	r0, =__bss_start	/* this is auto-relocated! */
 
 #ifdef CONFIG_USE_ARCH_MEMSET
@@ -141,6 +162,7 @@ clbss_l:cmp	r0, r1			/* while not at end of BSS */
 	addlo	r0, r0, #4		/* move to next */
 	blo	clbss_l
 #endif
+#endif
 
 #if ! defined(CONFIG_SPL_BUILD)
 	bl coloured_LED_init
-- 
2.17.1

  parent reply	other threads:[~2019-03-11 21:35 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-11 21:35 [U-Boot] [PATCH 0/6] spl: full-featured heap cleanups Simon Goldschmidt
2019-03-11 21:35 ` [U-Boot] [PATCH 1/6] spl: add Kconfig option to clear bss early Simon Goldschmidt
2019-03-12  6:02   ` Stefan Roese
2019-03-12 20:52     ` Simon Goldschmidt
2019-03-11 21:35 ` Simon Goldschmidt [this message]
2019-03-11 21:35 ` [U-Boot] [PATCH 3/6] dlmalloc: fix malloc range at end of ram Simon Goldschmidt
2019-03-11 21:35 ` [U-Boot] [PATCH 4/6] dlmalloc: be compatible to tiny printf Simon Goldschmidt
2019-03-11 21:35 ` [U-Boot] [PATCH 5/6] spl: support using full malloc with SYS_MALLOC_F_LEN Simon Goldschmidt
2019-03-19  1:24   ` Simon Glass
2019-03-19 18:52     ` Simon Goldschmidt
2019-03-11 21:35 ` [U-Boot] [PATCH 6/6] arm: socfpga: a10: move SPL stack size to Kconfig Simon Goldschmidt
2019-03-18  7:45   ` Chee, Tien Fong

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