[U-Boot] [PATCH 1/5] arm: Use r2 instead of r0 in start.S

[Simon Glass]

Allow r0 to be used for other purposes in this file.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 arch/arm/cpu/armv7/start.S | 88 +++++++++++++++++++++++-----------------------
 1 file changed, 44 insertions(+), 44 deletions(-)

diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
index 70048c1..c5f94ef 100644
--- a/arch/arm/cpu/armv7/start.S
+++ b/arch/arm/cpu/armv7/start.S
@@ -38,13 +38,13 @@ reset:
 	 * disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode,
 	 * except if in HYP mode already
 	 */
-	mrs	r0, cpsr
-	and	r1, r0, #0x1f		@ mask mode bits
+	mrs	r2, cpsr
+	and	r1, r2, #0x1f		@ mask mode bits
 	teq	r1, #0x1a		@ test for HYP mode
-	bicne	r0, r0, #0x1f		@ clear all mode bits
-	orrne	r0, r0, #0x13		@ set SVC mode
-	orr	r0, r0, #0xc0		@ disable FIQ and IRQ
-	msr	cpsr,r0
+	bicne	r2, r2, #0x1f		@ clear all mode bits
+	orrne	r2, r2, #0x13		@ set SVC mode
+	orr	r2, r2, #0xc0		@ disable FIQ and IRQ
+	msr	cpsr, r2
 
 /*
  * Setup vector:
@@ -53,13 +53,13 @@ reset:
  */
 #if !(defined(CONFIG_OMAP44XX) && defined(CONFIG_SPL_BUILD))
 	/* Set V=0 in CP15 SCTLR register - for VBAR to point to vector */
-	mrc	p15, 0, r0, c1, c0, 0	@ Read CP15 SCTLR Register
-	bic	r0, #CR_V		@ V = 0
-	mcr	p15, 0, r0, c1, c0, 0	@ Write CP15 SCTLR Register
+	mrc	p15, 0, r2, c1, c0, 0	@ Read CP15 SCTLR Register
+	bic	r2, #CR_V		@ V = 0
+	mcr	p15, 0, r2, c1, c0, 0	@ Write CP15 SCTLR Register
 
 	/* Set vector address in CP15 VBAR register */
-	ldr	r0, =_start
-	mcr	p15, 0, r0, c12, c0, 0	@Set VBAR
+	ldr	r2, =_start
+	mcr	p15, 0, r2, c12, c0, 0	@Set VBAR
 #endif
 
 	/* the mask ROM code should have PLL and others stable */
@@ -77,9 +77,9 @@ ENTRY(c_runtime_cpu_setup)
  * If I-cache is enabled invalidate it
  */
 #ifndef CONFIG_SYS_ICACHE_OFF
-	mcr	p15, 0, r0, c7, c5, 0	@ invalidate icache
-	mcr     p15, 0, r0, c7, c10, 4	@ DSB
-	mcr     p15, 0, r0, c7, c5, 4	@ ISB
+	mcr	p15, 0, r2, c7, c5, 0	@ invalidate icache
+	mcr     p15, 0, r2, c7, c10, 4	@ DSB
+	mcr     p15, 0, r2, c7, c5, 4	@ ISB
 #endif
 
 	bx	lr
@@ -88,7 +88,7 @@ ENDPROC(c_runtime_cpu_setup)
 
 /*************************************************************************
  *
- * void save_boot_params(u32 r0, u32 r1, u32 r2, u32 r3)
+ * void save_boot_params(u32 r2, u32 r1, u32 r2, u32 r3)
  *	__attribute__((weak));
  *
  * Stack pointer is not yet initialized at this moment
@@ -112,55 +112,55 @@ ENTRY(cpu_init_cp15)
 	/*
 	 * Invalidate L1 I/D
 	 */
-	mov	r0, #0			@ set up for MCR
-	mcr	p15, 0, r0, c8, c7, 0	@ invalidate TLBs
-	mcr	p15, 0, r0, c7, c5, 0	@ invalidate icache
-	mcr	p15, 0, r0, c7, c5, 6	@ invalidate BP array
-	mcr     p15, 0, r0, c7, c10, 4	@ DSB
-	mcr     p15, 0, r0, c7, c5, 4	@ ISB
+	mov	r2, #0			@ set up for MCR
+	mcr	p15, 0, r2, c8, c7, 0	@ invalidate TLBs
+	mcr	p15, 0, r2, c7, c5, 0	@ invalidate icache
+	mcr	p15, 0, r2, c7, c5, 6	@ invalidate BP array
+	mcr     p15, 0, r2, c7, c10, 4	@ DSB
+	mcr     p15, 0, r2, c7, c5, 4	@ ISB
 
 	/*
 	 * disable MMU stuff and caches
 	 */
-	mrc	p15, 0, r0, c1, c0, 0
-	bic	r0, r0, #0x00002000	@ clear bits 13 (--V-)
-	bic	r0, r0, #0x00000007	@ clear bits 2:0 (-CAM)
-	orr	r0, r0, #0x00000002	@ set bit 1 (--A-) Align
-	orr	r0, r0, #0x00000800	@ set bit 11 (Z---) BTB
+	mrc	p15, 0, r2, c1, c0, 0
+	bic	r2, r2, #0x00002000	@ clear bits 13 (--V-)
+	bic	r2, r2, #0x00000007	@ clear bits 2:0 (-CAM)
+	orr	r2, r2, #0x00000002	@ set bit 1 (--A-) Align
+	orr	r2, r2, #0x00000800	@ set bit 11 (Z---) BTB
 #ifdef CONFIG_SYS_ICACHE_OFF
-	bic	r0, r0, #0x00001000	@ clear bit 12 (I) I-cache
+	bic	r2, r2, #0x00001000	@ clear bit 12 (I) I-cache
 #else
-	orr	r0, r0, #0x00001000	@ set bit 12 (I) I-cache
+	orr	r2, r2, #0x00001000	@ set bit 12 (I) I-cache
 #endif
-	mcr	p15, 0, r0, c1, c0, 0
+	mcr	p15, 0, r2, c1, c0, 0
 
 #ifdef CONFIG_ARM_ERRATA_716044
-	mrc	p15, 0, r0, c1, c0, 0	@ read system control register
-	orr	r0, r0, #1 << 11	@ set bit #11
-	mcr	p15, 0, r0, c1, c0, 0	@ write system control register
+	mrc	p15, 0, r2, c1, c0, 0	@ read system control register
+	orr	r2, r2, #1 << 11	@ set bit #11
+	mcr	p15, 0, r2, c1, c0, 0	@ write system control register
 #endif
 
 #if (defined(CONFIG_ARM_ERRATA_742230) || defined(CONFIG_ARM_ERRATA_794072))
-	mrc	p15, 0, r0, c15, c0, 1	@ read diagnostic register
-	orr	r0, r0, #1 << 4		@ set bit #4
-	mcr	p15, 0, r0, c15, c0, 1	@ write diagnostic register
+	mrc	p15, 0, r2, c15, c0, 1	@ read diagnostic register
+	orr	r2, r2, #1 << 4		@ set bit #4
+	mcr	p15, 0, r2, c15, c0, 1	@ write diagnostic register
 #endif
 
 #ifdef CONFIG_ARM_ERRATA_743622
-	mrc	p15, 0, r0, c15, c0, 1	@ read diagnostic register
-	orr	r0, r0, #1 << 6		@ set bit #6
-	mcr	p15, 0, r0, c15, c0, 1	@ write diagnostic register
+	mrc	p15, 0, r2, c15, c0, 1	@ read diagnostic register
+	orr	r2, r2, #1 << 6		@ set bit #6
+	mcr	p15, 0, r2, c15, c0, 1	@ write diagnostic register
 #endif
 
 #ifdef CONFIG_ARM_ERRATA_751472
-	mrc	p15, 0, r0, c15, c0, 1	@ read diagnostic register
-	orr	r0, r0, #1 << 11	@ set bit #11
-	mcr	p15, 0, r0, c15, c0, 1	@ write diagnostic register
+	mrc	p15, 0, r2, c15, c0, 1	@ read diagnostic register
+	orr	r2, r2, #1 << 11	@ set bit #11
+	mcr	p15, 0, r2, c15, c0, 1	@ write diagnostic register
 #endif
 #ifdef CONFIG_ARM_ERRATA_761320
-	mrc	p15, 0, r0, c15, c0, 1	@ read diagnostic register
-	orr	r0, r0, #1 << 21	@ set bit #21
-	mcr	p15, 0, r0, c15, c0, 1	@ write diagnostic register
+	mrc	p15, 0, r2, c15, c0, 1	@ read diagnostic register
+	orr	r2, r2, #1 << 21	@ set bit #21
+	mcr	p15, 0, r2, c15, c0, 1	@ write diagnostic register
 #endif
 
 	mov	pc, lr			@ back to my caller
-- 
2.2.0.rc0.207.ga3a616c