Commit 0f890c8d authored by Suzuki Poulose's avatar Suzuki Poulose Committed by Josh Boyer
Browse files

powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE 



The current implementation of CONFIG_RELOCATABLE in BookE is based
on mapping the page aligned kernel load address to KERNELBASE. This
approach however is not enough for platforms, where the TLB page size
is large (e.g, 256M on 44x). So we are renaming the RELOCATABLE used
currently in BookE to DYNAMIC_MEMSTART to reflect the actual method.

The CONFIG_RELOCATABLE for PPC32(BookE) based on processing of the
dynamic relocations will be introduced in the later in the patch series.

This change would allow the use of the old method of RELOCATABLE for
platforms which can afford to enforce the page alignment (platforms with
smaller TLB size).

Changes since v3:

* Introduced a new config, NONSTATIC_KERNEL, to denote a kernel which is
  either a RELOCATABLE or DYNAMIC_MEMSTART(Suggested by: Josh Boyer)

Suggested-by: default avatarScott Wood <scottwood@freescale.com>
Tested-by: default avatarScott Wood <scottwood@freescale.com>

Signed-off-by: default avatarSuzuki K. Poulose <suzuki@in.ibm.com>
Cc: Scott Wood <scottwood@freescale.com>
Cc: Kumar Gala <galak@kernel.crashing.org>
Cc: Josh Boyer <jwboyer@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux ppc dev <linuxppc-dev@lists.ozlabs.org>
Signed-off-by: default avatarJosh Boyer <jwboyer@gmail.com>
parent 3f53638c

arch/powerpc/Kconfig

+41 −19
Original line number Diff line number Diff line
@@ -368,7 +368,8 @@ config KEXEC 
config CRASH_DUMP

	bool "Build a kdump crash kernel"

	depends on PPC64 || 6xx || FSL_BOOKE

	select RELOCATABLE if PPC64 || FSL_BOOKE

	select RELOCATABLE if PPC64

	select DYNAMIC_MEMSTART if FSL_BOOKE

	help

	  Build a kernel suitable for use as a kdump capture kernel.

	  The same kernel binary can be used as production kernel and dump
@@ -777,6 +778,10 @@ source "drivers/rapidio/Kconfig" 


endmenu



config NONSTATIC_KERNEL

	bool

	default n



menu "Advanced setup"

	depends on PPC32
@@ -826,23 +831,39 @@ config LOWMEM_CAM_NUM 
	int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL

	default 3



config RELOCATABLE

	bool "Build a relocatable kernel (EXPERIMENTAL)"

config DYNAMIC_MEMSTART

	bool "Enable page aligned dynamic load address for kernel (EXPERIMENTAL)"

	depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || PPC_47x)

	help

	  This builds a kernel image that is capable of running at the

	  location the kernel is loaded at (some alignment restrictions may

	  exist).



	  One use is for the kexec on panic case where the recovery kernel

	  must live at a different physical address than the primary

	  kernel.



	  Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address

	  it has been loaded at and the compile time physical addresses

	  CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START

	  setting can still be useful to bootwrappers that need to know the

	  load location of the kernel (eg. u-boot/mkimage).

	select NONSTATIC_KERNEL

	help

	  This option enables the kernel to be loaded at any page aligned

	  physical address. The kernel creates a mapping from KERNELBASE to 

	  the address where the kernel is loaded. The page size here implies

	  the TLB page size of the mapping for kernel on the particular platform.

	  Please refer to the init code for finding the TLB page size.



	  DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE

	  kernel image, where the only restriction is the page aligned kernel

	  load address. When this option is enabled, the compile time physical 

	  address CONFIG_PHYSICAL_START is ignored.



# Mapping based RELOCATABLE is moved to DYNAMIC_MEMSTART

# config RELOCATABLE

#	bool "Build a relocatable kernel (EXPERIMENTAL)"

#	depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || PPC_47x)

#	help

#	  This builds a kernel image that is capable of running at the

#	  location the kernel is loaded at, without any alignment restrictions.

#

#	  One use is for the kexec on panic case where the recovery kernel

#	  must live at a different physical address than the primary

#	  kernel.

#

#	  Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address

#	  it has been loaded at and the compile time physical addresses

#	  CONFIG_PHYSICAL_START is ignored.  However CONFIG_PHYSICAL_START

#	  setting can still be useful to bootwrappers that need to know the

#	  load location of the kernel (eg. u-boot/mkimage).



config PAGE_OFFSET_BOOL

	bool "Set custom page offset address"
@@ -872,7 +893,7 @@ config KERNEL_START_BOOL 
config KERNEL_START

	hex "Virtual address of kernel base" if KERNEL_START_BOOL

	default PAGE_OFFSET if PAGE_OFFSET_BOOL

	default "0xc2000000" if CRASH_DUMP && !RELOCATABLE

	default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL

	default "0xc0000000"



config PHYSICAL_START_BOOL
@@ -885,7 +906,7 @@ config PHYSICAL_START_BOOL 


config PHYSICAL_START

	hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL

	default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !RELOCATABLE

	default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL

	default "0x00000000"



config PHYSICAL_ALIGN
@@ -931,6 +952,7 @@ endmenu 
if PPC64

config RELOCATABLE

	bool "Build a relocatable kernel"

	select NONSTATIC_KERNEL

	help

	  This builds a kernel image that is capable of running anywhere

	  in the RMA (real memory area) at any 16k-aligned base address.

arch/powerpc/configs/44x/iss476-smp_defconfig

+2 −1
Original line number Diff line number Diff line
@@ -25,7 +25,8 @@ CONFIG_CMDLINE_BOOL=y 
CONFIG_CMDLINE="root=/dev/issblk0"

# CONFIG_PCI is not set

CONFIG_ADVANCED_OPTIONS=y

CONFIG_RELOCATABLE=y

CONFIG_NONSTATIC_KERNEL=y

CONFIG_DYNAMIC_MEMSTART=y

CONFIG_NET=y

CONFIG_PACKET=y

CONFIG_UNIX=y

arch/powerpc/include/asm/kdump.h

+2 −2
Original line number Diff line number Diff line
@@ -32,11 +32,11 @@ 


#ifndef __ASSEMBLY__



#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_RELOCATABLE)

#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)

extern void reserve_kdump_trampoline(void);

extern void setup_kdump_trampoline(void);

#else

/* !CRASH_DUMP || RELOCATABLE */

/* !CRASH_DUMP || !NONSTATIC_KERNEL */

static inline void reserve_kdump_trampoline(void) { ; }

static inline void setup_kdump_trampoline(void) { ; }

#endif

arch/powerpc/include/asm/page.h

+2 −2
Original line number Diff line number Diff line
@@ -92,7 +92,7 @@ extern unsigned int HPAGE_SHIFT; 
#define PAGE_OFFSET	ASM_CONST(CONFIG_PAGE_OFFSET)

#define LOAD_OFFSET	ASM_CONST((CONFIG_KERNEL_START-CONFIG_PHYSICAL_START))



#if defined(CONFIG_RELOCATABLE)

#if defined(CONFIG_NONSTATIC_KERNEL)

#ifndef __ASSEMBLY__



extern phys_addr_t memstart_addr;
@@ -105,7 +105,7 @@ extern phys_addr_t kernstart_addr; 


#ifdef CONFIG_PPC64

#define MEMORY_START	0UL

#elif defined(CONFIG_RELOCATABLE)

#elif defined(CONFIG_NONSTATIC_KERNEL)

#define MEMORY_START	memstart_addr

#else

#define MEMORY_START	(PHYSICAL_START + PAGE_OFFSET - KERNELBASE)

arch/powerpc/kernel/crash_dump.c

+2 −2
Original line number Diff line number Diff line
@@ -28,7 +28,7 @@ 
#define DBG(fmt...)

#endif



#ifndef CONFIG_RELOCATABLE

#ifndef CONFIG_NONSTATIC_KERNEL

void __init reserve_kdump_trampoline(void)

{

	memblock_reserve(0, KDUMP_RESERVE_LIMIT);
@@ -67,7 +67,7 @@ void __init setup_kdump_trampoline(void) 


	DBG(" <- setup_kdump_trampoline()\n");

}

#endif /* CONFIG_RELOCATABLE */

#endif /* CONFIG_NONSTATIC_KERNEL */



static int __init parse_savemaxmem(char *p)

{

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