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Commit 2f812c0b authored by Robin Getz's avatar Robin Getz Committed by Mike Frysinger
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Blackfin: clean up early memory setup code 



Remove code duplication, and only print out memory warnings when they are
an actual problem.

Signed-off-by: default avatarRobin Getz <robin.getz@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent a7690940

arch/blackfin/kernel/setup.c

+32 −28
Original line number Diff line number Diff line
@@ -511,6 +511,7 @@ static __init void memory_setup(void) 
#ifdef CONFIG_MTD_UCLINUX

	unsigned long mtd_phys = 0;

#endif

	unsigned long max_mem;



	_rambase = (unsigned long)_stext;

	_ramstart = (unsigned long)_end;
@@ -520,7 +521,22 @@ static __init void memory_setup(void) 
		panic("DMA region exceeds memory limit: %lu.",

			_ramend - _ramstart);

	}

	memory_end = _ramend - DMA_UNCACHED_REGION;

	max_mem = memory_end = _ramend - DMA_UNCACHED_REGION;



#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)

	/* Due to a Hardware Anomaly we need to limit the size of usable

	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on

	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception

	 */

# if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))

	if (max_mem >= 56 * 1024 * 1024)

		max_mem = 56 * 1024 * 1024;

# else

	if (max_mem >= 60 * 1024 * 1024)

		max_mem = 60 * 1024 * 1024;

# endif				/* CONFIG_DEBUG_HUNT_FOR_ZERO */

#endif				/* ANOMALY_05000263 */





#ifdef CONFIG_MPU

	/* Round up to multiple of 4MB */
@@ -549,22 +565,16 @@ static __init void memory_setup(void) 


# if defined(CONFIG_ROMFS_FS)

	if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0

	    && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)

	    && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1) {

		mtd_size =

		    PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));

#  if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)

	/* Due to a Hardware Anomaly we need to limit the size of usable

	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on

	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception

	 */

#   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))

	if (memory_end >= 56 * 1024 * 1024)

		memory_end = 56 * 1024 * 1024;

#   else

	if (memory_end >= 60 * 1024 * 1024)

		memory_end = 60 * 1024 * 1024;

#   endif				/* CONFIG_DEBUG_HUNT_FOR_ZERO */

#  endif				/* ANOMALY_05000263 */



		/* ROM_FS is XIP, so if we found it, we need to limit memory */

		if (memory_end > max_mem) {

			pr_info("Limiting kernel memory to %liMB due to anomaly 05000263\n", max_mem >> 20);

			memory_end = max_mem;

		}

	}

# endif				/* CONFIG_ROMFS_FS */



	/* Since the default MTD_UCLINUX has no magic number, we just blindly
@@ -586,20 +596,14 @@ static __init void memory_setup(void) 
	}

#endif				/* CONFIG_MTD_UCLINUX */



#if (defined(CONFIG_BFIN_EXTMEM_ICACHEABLE) && ANOMALY_05000263)

	/* Due to a Hardware Anomaly we need to limit the size of usable

	 * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on

	 * 05000263 - Hardware loop corrupted when taking an ICPLB exception

	/* We need lo limit memory, since everything could have a text section

	 * of userspace in it, and expose anomaly 05000263. If the anomaly

	 * doesn't exist, or we don't need to - then dont.

	 */

#if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))

	if (memory_end >= 56 * 1024 * 1024)

		memory_end = 56 * 1024 * 1024;

#else

	if (memory_end >= 60 * 1024 * 1024)

		memory_end = 60 * 1024 * 1024;

#endif				/* CONFIG_DEBUG_HUNT_FOR_ZERO */

	printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);

#endif				/* ANOMALY_05000263 */

	if (memory_end > max_mem) {

		pr_info("Limiting kernel memory to %liMB due to anomaly 05000263\n", max_mem >> 20);

		memory_end = max_mem;

	}



#ifdef CONFIG_MPU

	page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;