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powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE

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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: Scott Wood <scottwood@freescale.com>
Tested-by: Scott Wood <scottwood@freescale.com>

Signed-off-by: Suzuki 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: Josh Boyer <jwboyer@gmail.com>
This commit is contained in:
Suzuki Poulose 2011-12-14 22:57:15 +00:00 committed by Josh Boyer
parent 3f53638c80
commit 0f890c8d20
10 changed files with 53 additions and 28 deletions
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54
arch/powerpc/Kconfig
View File

@ -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)
select NONSTATIC_KERNEL
help
This builds a kernel image that is capable of running at the
location the kernel is loaded at (some alignment restrictions may
exist).
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.
One use is for the kexec on panic case where the recovery kernel
must live at a different physical address than the primary
kernel.
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.
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).
# 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.

3
arch/powerpc/configs/44x/iss476-smp_defconfig
View File

@ -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

4
arch/powerpc/include/asm/kdump.h
View File

@ -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

4
arch/powerpc/include/asm/page.h
View File

@ -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)

4
arch/powerpc/kernel/crash_dump.c
View File

@ -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)
{

4
arch/powerpc/kernel/head_44x.S
View File

@ -86,8 +86,10 @@ _ENTRY(_start);
bl early_init
#ifdef CONFIG_RELOCATABLE
#ifdef CONFIG_DYNAMIC_MEMSTART
/*
* Mapping based, page aligned dynamic kernel loading.
*
* r25 will contain RPN/ERPN for the start address of memory
*
* Add the difference between KERNELBASE and PAGE_OFFSET to the

2
arch/powerpc/kernel/head_fsl_booke.S
View File

@ -197,7 +197,7 @@ _ENTRY(__early_start)
bl early_init
#ifdef CONFIG_RELOCATABLE
#ifdef CONFIG_DYNAMIC_MEMSTART
lis r3,kernstart_addr@ha
la r3,kernstart_addr@l(r3)
#ifdef CONFIG_PHYS_64BIT

2
arch/powerpc/kernel/machine_kexec.c
View File

@ -128,7 +128,7 @@ void __init reserve_crashkernel(void)
crash_size = resource_size(&crashk_res);
#ifndef CONFIG_RELOCATABLE
#ifndef CONFIG_NONSTATIC_KERNEL
if (crashk_res.start != KDUMP_KERNELBASE)
printk("Crash kernel location must be 0x%x\n",
KDUMP_KERNELBASE);

2
arch/powerpc/kernel/prom_init.c
View File

@ -2845,7 +2845,7 @@ unsigned long __init prom_init(unsigned long r3, unsigned long r4,
RELOC(of_platform) = prom_find_machine_type();
prom_printf("Detected machine type: %x\n", RELOC(of_platform));
#ifndef CONFIG_RELOCATABLE
#ifndef CONFIG_NONSTATIC_KERNEL
/* Bail if this is a kdump kernel. */
if (PHYSICAL_START > 0)
prom_panic("Error: You can't boot a kdump kernel from OF!\n");

2
arch/powerpc/mm/44x_mmu.c
View File

@ -217,7 +217,7 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
{
u64 size;
#ifndef CONFIG_RELOCATABLE
#ifndef CONFIG_NONSTATIC_KERNEL
/* We don't currently support the first MEMBLOCK not mapping 0
* physical on those processors
*/