* [PATCH 1/4] powerpc: enable relocatable support for 6xx
2013-06-19 9:20 [PATCH 0/4] powerpc: enable relocatable support for 6xx Kevin Hao
@ 2013-06-19 9:20 ` Kevin Hao
2013-06-19 9:20 ` [PATCH 2/4] powerpc: move the exception trampoline helper functions to a separate file Kevin Hao
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: Kevin Hao @ 2013-06-19 9:20 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc
This is based on the codes in head_44x.S. With this patch the kernel
can only boot from 0 with CONFIG_RELOCATABLE enabled. We will add the
support to boot from a non 0 address in the following patches.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/include/asm/page.h | 2 +-
arch/powerpc/kernel/head_32.S | 103 +++++++++++++++++++++++++++++++++
arch/powerpc/kernel/prom_init_check.sh | 2 +-
4 files changed, 106 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index c33e3ad..8fe2792 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -866,7 +866,7 @@ config DYNAMIC_MEMSTART
config RELOCATABLE
bool "Build a relocatable kernel"
- depends on ADVANCED_OPTIONS && FLATMEM && 44x
+ depends on ADVANCED_OPTIONS && FLATMEM && (44x || 6xx)
select NONSTATIC_KERNEL
help
This builds a kernel image that is capable of running at the
diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h
index 988c812..7145c14 100644
--- a/arch/powerpc/include/asm/page.h
+++ b/arch/powerpc/include/asm/page.h
@@ -207,7 +207,7 @@ extern long long virt_phys_offset;
* On non-Book-E PPC64 PAGE_OFFSET and MEMORY_START are constants so use
* the other definitions for __va & __pa.
*/
-#ifdef CONFIG_BOOKE
+#if defined(CONFIG_BOOKE) || defined(CONFIG_6xx)
#define __va(x) ((void *)(unsigned long)((phys_addr_t)(x) + VIRT_PHYS_OFFSET))
#define __pa(x) ((unsigned long)(x) - VIRT_PHYS_OFFSET)
#else
diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index dc0488b..eb47b13 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -73,6 +73,8 @@ _ENTRY(_start);
nop /* used by __secondary_hold on prep (mtx) and chrp smp */
nop
+ bl perform_relocation
+
/* PMAC
* Enter here with the kernel text, data and bss loaded starting at
* 0, running with virtual == physical mapping.
@@ -149,6 +151,8 @@ __start:
*/
bl early_init
+ bl after_relocation_init
+
/* Switch MMU off, clear BATs and flush TLB. At this point, r3 contains
* the physical address we are running at, returned by early_init()
*/
@@ -180,6 +184,7 @@ __after_mmu_off:
#endif /* CONFIG_6xx */
+#ifndef CONFIG_RELOCATABLE
/*
* We need to run with _start at physical address 0.
* On CHRP, we are loaded at 0x10000 since OF on CHRP uses
@@ -193,6 +198,8 @@ __after_mmu_off:
lis r5,PHYSICAL_START@h
cmplw 0,r4,r5 /* already running at PHYSICAL_START? */
bne relocate_kernel
+#endif
+
/*
* we now have the 1st 16M of ram mapped with the bats.
* prep needs the mmu to be turned on here, but pmac already has it on.
@@ -1263,6 +1270,102 @@ m8260_gorom:
blr
#endif
+perform_relocation:
+#ifdef CONFIG_RELOCATABLE
+/*
+ * Relocate ourselves to the current runtime address.
+ * This is called only by the Boot CPU.
+ * r21 will be loaded with the physical runtime address of _stext
+ * Save the r3~r7 since these registers may contain the values needed
+ * by the following boot code.
+ */
+ mr r22,r3
+ mr r23,r4
+ mr r24,r5
+ mr r25,r6
+ mr r26,r7
+
+ mflr r20
+ bl 0f /* Get our runtime address */
+0: mflr r21 /* Make it accessible */
+ addis r21,r21,(_stext - 0b)@ha
+ addi r21,r21,(_stext - 0b)@l /*Get our current runtime base*/
+
+ /*
+ * We have the runtime address of our base.
+ * We calculate our shift of offset from a 256M page.
+ * We could map the 256M page we belong to at PAGE_OFFSET and
+ * get going from there.
+ */
+ lis r4,KERNELBASE@h
+ ori r4,r4,KERNELBASE@l
+ rlwinm r6,r21,0,4,31 /* r6 = PHYS_START % 256M */
+ rlwinm r5,r4,0,4,31 /* r5 = KERNELBASE % 256M */
+ subf r3,r5,r6 /* r3 = r6 - r5 */
+ add r3,r4,r3 /* Required Virutal Address */
+
+ bl relocate
+ mtlr r20
+ mr r3,r22
+ mr r4,r23
+ mr r5,r24
+ mr r6,r25
+ mr r7,r26
+#endif
+ blr
+
+after_relocation_init:
+#ifdef CONFIG_RELOCATABLE
+ /*
+ * Relocatable kernel support based on processing of dynamic
+ * relocation entries.
+ *
+ * r21 will contain the current offset of _stext
+ */
+ lis r3,kernstart_addr@ha
+ la r3,kernstart_addr@l(r3)
+
+ /* Store kernstart_addr */
+ tophys(r3,r3)
+ stw r21,0(r3)
+
+ /*
+ * Compute the virt_phys_offset :
+ * virt_phys_offset = stext.run - kernstart_addr
+ *
+ * stext.run = (KERNELBASE & ~0xfffffff) + (kernstart_addr & 0xfffffff)
+ * When we relocate, we have :
+ *
+ * (kernstart_addr & 0xfffffff) = (stext.run & 0xfffffff)
+ *
+ * hence:
+ * virt_phys_offset = (KERNELBASE & ~0xfffffff)
+ * - (kernstart_addr & ~0xfffffff)
+ *
+ */
+
+ /* KERNELBASE&~0xfffffff => (r4,r5) */
+ lis r5,KERNELBASE@h
+ rlwinm r5,r5,0,0,3 /* Align to 256M, lower 32bit */
+
+ /* kernelstart_addr & ~0xfffffff => (r6,r7) */
+ rlwinm r7,r21,0,0,3 /* Align to 256M, lower 32bit */
+
+ /*
+ * 64bit subtraction.
+ */
+ subf r5,r7,r5
+
+ /* Store virt_phys_offset */
+ lis r3,virt_phys_offset@h
+ ori r3,r3,virt_phys_offset@l
+
+ tophys(r3,r3)
+ li r4,0
+ stw r4,0(r3) /* Higher 32bit */
+ stw r5,4(r3) /* Lower 32bit */
+#endif
+ blr
/*
* We put a few things here that have to be page-aligned.
diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 3765da6..a24c208 100644
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -22,7 +22,7 @@ __secondary_hold_acknowledge __secondary_hold_spinloop __start
strcmp strcpy strlcpy strlen strncmp strstr logo_linux_clut224
reloc_got2 kernstart_addr memstart_addr linux_banner _stext
opal_query_takeover opal_do_takeover opal_enter_rtas opal_secondary_entry
-boot_command_line __prom_init_toc_start __prom_init_toc_end"
+boot_command_line __prom_init_toc_start __prom_init_toc_end virt_phys_offset"
NM="$1"
OBJ="$2"
--
1.8.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 2/4] powerpc: move the exception trampoline helper functions to a separate file
2013-06-19 9:20 [PATCH 0/4] powerpc: enable relocatable support for 6xx Kevin Hao
2013-06-19 9:20 ` [PATCH 1/4] " Kevin Hao
@ 2013-06-19 9:20 ` Kevin Hao
2013-06-19 9:20 ` [PATCH 3/4] powerpc: s/kdump/exception/ for the exception trampoline functions Kevin Hao
2013-06-19 9:20 ` [PATCH 4/4] powerpc: make the kernel bootable from non 0 address for 6xx Kevin Hao
3 siblings, 0 replies; 5+ messages in thread
From: Kevin Hao @ 2013-06-19 9:20 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc
For some platform such as 6xx we need to setup the exception
trampoline for a relocatable kernel even through the CONFIG_CRASH_DUMP
is disabled. So move these functions to a separate file so they can
be used by non dump kernel. This patch doesn't introduce any function
change.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
---
arch/powerpc/include/asm/exception_trampoline.h | 35 +++++++++++++
arch/powerpc/include/asm/kdump.h | 32 -----------
arch/powerpc/kernel/Makefile | 2 +-
arch/powerpc/kernel/crash_dump.c | 41 ---------------
arch/powerpc/kernel/exception_trampoline.c | 70 +++++++++++++++++++++++++
arch/powerpc/kernel/prom.c | 2 +-
arch/powerpc/kernel/setup_32.c | 1 +
arch/powerpc/kernel/setup_64.c | 2 +-
8 files changed, 109 insertions(+), 76 deletions(-)
create mode 100644 arch/powerpc/include/asm/exception_trampoline.h
create mode 100644 arch/powerpc/kernel/exception_trampoline.c
diff --git a/arch/powerpc/include/asm/exception_trampoline.h b/arch/powerpc/include/asm/exception_trampoline.h
new file mode 100644
index 0000000..707ad6c
--- /dev/null
+++ b/arch/powerpc/include/asm/exception_trampoline.h
@@ -0,0 +1,35 @@
+#ifndef _EXCEPTION_TRAMPOLINE_H
+#define _EXCEPTION_TRAMPOLINE_H
+
+/* How many bytes to reserve at zero for kdump. The reserve limit should
+ * be greater or equal to the trampoline's end address.
+ * Reserve to the end of the FWNMI area, see head_64.S */
+#define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
+
+/*
+ * On PPC64 translation is disabled during trampoline setup, so we use
+ * physical addresses. Though on PPC32 translation is already enabled,
+ * so we can't do the same. Luckily create_trampoline() creates relative
+ * branches, so we can just add the PAGE_OFFSET and don't worry about it.
+ */
+#ifdef __powerpc64__
+#define KDUMP_TRAMPOLINE_START 0x0100
+#define KDUMP_TRAMPOLINE_END 0x3000
+#else
+#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
+#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
+#endif /* __powerpc64__ */
+
+#ifndef __ASSEMBLY__
+
+#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
+extern void reserve_kdump_trampoline(void);
+extern void setup_kdump_trampoline(void);
+#else
+/* !CRASH_DUMP || !NONSTATIC_KERNEL */
+static inline void reserve_kdump_trampoline(void) { ; }
+static inline void setup_kdump_trampoline(void) { ; }
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* _EXCEPTION_TRAMPOLINE_H */
diff --git a/arch/powerpc/include/asm/kdump.h b/arch/powerpc/include/asm/kdump.h
index c977620..7ac3553 100644
--- a/arch/powerpc/include/asm/kdump.h
+++ b/arch/powerpc/include/asm/kdump.h
@@ -5,42 +5,10 @@
#define KDUMP_KERNELBASE 0x2000000
-/* How many bytes to reserve at zero for kdump. The reserve limit should
- * be greater or equal to the trampoline's end address.
- * Reserve to the end of the FWNMI area, see head_64.S */
-#define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
-
#ifdef CONFIG_CRASH_DUMP
-/*
- * On PPC64 translation is disabled during trampoline setup, so we use
- * physical addresses. Though on PPC32 translation is already enabled,
- * so we can't do the same. Luckily create_trampoline() creates relative
- * branches, so we can just add the PAGE_OFFSET and don't worry about it.
- */
-#ifdef __powerpc64__
-#define KDUMP_TRAMPOLINE_START 0x0100
-#define KDUMP_TRAMPOLINE_END 0x3000
-#else
-#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
-#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
-#endif /* __powerpc64__ */
-
#define KDUMP_MIN_TCE_ENTRIES 2048
#endif /* CONFIG_CRASH_DUMP */
-#ifndef __ASSEMBLY__
-
-#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
-extern void reserve_kdump_trampoline(void);
-extern void setup_kdump_trampoline(void);
-#else
-/* !CRASH_DUMP || !NONSTATIC_KERNEL */
-static inline void reserve_kdump_trampoline(void) { ; }
-static inline void setup_kdump_trampoline(void) { ; }
-#endif
-
-#endif /* __ASSEMBLY__ */
-
#endif /* __PPC64_KDUMP_H */
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index f960a79..c73a0e3 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -59,7 +59,7 @@ obj-$(CONFIG_LPARCFG) += lparcfg.o
obj-$(CONFIG_IBMVIO) += vio.o
obj-$(CONFIG_IBMEBUS) += ibmebus.o
obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o
-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+obj-$(CONFIG_CRASH_DUMP) += crash_dump.o exception_trampoline.o
obj-$(CONFIG_FA_DUMP) += fadump.o
ifeq ($(CONFIG_PPC32),y)
obj-$(CONFIG_E500) += idle_e500.o
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c
index 9ec3fe1..56dab87 100644
--- a/arch/powerpc/kernel/crash_dump.c
+++ b/arch/powerpc/kernel/crash_dump.c
@@ -28,47 +28,6 @@
#define DBG(fmt...)
#endif
-#ifndef CONFIG_NONSTATIC_KERNEL
-void __init reserve_kdump_trampoline(void)
-{
- memblock_reserve(0, KDUMP_RESERVE_LIMIT);
-}
-
-static void __init create_trampoline(unsigned long addr)
-{
- unsigned int *p = (unsigned int *)addr;
-
- /* The maximum range of a single instruction branch, is the current
- * instruction's address + (32 MB - 4) bytes. For the trampoline we
- * need to branch to current address + 32 MB. So we insert a nop at
- * the trampoline address, then the next instruction (+ 4 bytes)
- * does a branch to (32 MB - 4). The net effect is that when we
- * branch to "addr" we jump to ("addr" + 32 MB). Although it requires
- * two instructions it doesn't require any registers.
- */
- patch_instruction(p, PPC_INST_NOP);
- patch_branch(++p, addr + PHYSICAL_START, 0);
-}
-
-void __init setup_kdump_trampoline(void)
-{
- unsigned long i;
-
- DBG(" -> setup_kdump_trampoline()\n");
-
- for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
- create_trampoline(i);
- }
-
-#ifdef CONFIG_PPC_PSERIES
- create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
- create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
-#endif /* CONFIG_PPC_PSERIES */
-
- DBG(" <- setup_kdump_trampoline()\n");
-}
-#endif /* CONFIG_NONSTATIC_KERNEL */
-
static int __init parse_savemaxmem(char *p)
{
if (p)
diff --git a/arch/powerpc/kernel/exception_trampoline.c b/arch/powerpc/kernel/exception_trampoline.c
new file mode 100644
index 0000000..71f4b72
--- /dev/null
+++ b/arch/powerpc/kernel/exception_trampoline.c
@@ -0,0 +1,70 @@
+/*
+ * Routines for doing kexec-based kdump.
+ *
+ * Copyright (C) 2005, IBM Corp.
+ *
+ * Created by: Michael Ellerman
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#undef DEBUG
+
+#include <linux/crash_dump.h>
+#include <linux/bootmem.h>
+#include <linux/memblock.h>
+#include <asm/code-patching.h>
+#include <asm/kdump.h>
+#include <asm/prom.h>
+#include <asm/firmware.h>
+#include <asm/uaccess.h>
+#include <asm/rtas.h>
+
+#ifdef DEBUG
+#include <asm/udbg.h>
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+#ifndef CONFIG_NONSTATIC_KERNEL
+void __init reserve_kdump_trampoline(void)
+{
+ memblock_reserve(0, KDUMP_RESERVE_LIMIT);
+}
+
+static void __init create_trampoline(unsigned long addr)
+{
+ unsigned int *p = (unsigned int *)addr;
+
+ /* The maximum range of a single instruction branch, is the current
+ * instruction's address + (32 MB - 4) bytes. For the trampoline we
+ * need to branch to current address + 32 MB. So we insert a nop at
+ * the trampoline address, then the next instruction (+ 4 bytes)
+ * does a branch to (32 MB - 4). The net effect is that when we
+ * branch to "addr" we jump to ("addr" + 32 MB). Although it requires
+ * two instructions it doesn't require any registers.
+ */
+ patch_instruction(p, PPC_INST_NOP);
+ patch_branch(++p, addr + PHYSICAL_START, 0);
+}
+
+void __init setup_kdump_trampoline(void)
+{
+ unsigned long i;
+
+ DBG(" -> setup_kdump_trampoline()\n");
+
+ for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
+ create_trampoline(i);
+ }
+
+#ifdef CONFIG_PPC_PSERIES
+ create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START);
+ create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
+#endif /* CONFIG_PPC_PSERIES */
+
+ DBG(" <- setup_kdump_trampoline()\n");
+}
+#endif /* CONFIG_NONSTATIC_KERNEL */
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 8b6f7a9..4a13ac5 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -40,7 +40,7 @@
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/io.h>
-#include <asm/kdump.h>
+#include <asm/exception_trampoline.h>
#include <asm/smp.h>
#include <asm/mmu.h>
#include <asm/paca.h>
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index a8f54ec..9f3aa43 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -38,6 +38,7 @@
#include <asm/serial.h>
#include <asm/udbg.h>
#include <asm/mmu_context.h>
+#include <asm/exception_trampoline.h>
#include "setup.h"
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index e379d3f..06b8562 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -38,7 +38,7 @@
#include <linux/hugetlb.h>
#include <asm/io.h>
-#include <asm/kdump.h>
+#include <asm/exception_trampoline.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
--
1.8.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 3/4] powerpc: s/kdump/exception/ for the exception trampoline functions
2013-06-19 9:20 [PATCH 0/4] powerpc: enable relocatable support for 6xx Kevin Hao
2013-06-19 9:20 ` [PATCH 1/4] " Kevin Hao
2013-06-19 9:20 ` [PATCH 2/4] powerpc: move the exception trampoline helper functions to a separate file Kevin Hao
@ 2013-06-19 9:20 ` Kevin Hao
2013-06-19 9:20 ` [PATCH 4/4] powerpc: make the kernel bootable from non 0 address for 6xx Kevin Hao
3 siblings, 0 replies; 5+ messages in thread
From: Kevin Hao @ 2013-06-19 9:20 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc
These functions are not just kdump specific. Replace the 'kdump' with
the 'exception' to make them more general.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
---
arch/powerpc/include/asm/exception_trampoline.h | 20 ++++++++++----------
arch/powerpc/kernel/exception_trampoline.c | 14 +++++++-------
arch/powerpc/kernel/prom.c | 2 +-
arch/powerpc/kernel/setup_32.c | 2 +-
arch/powerpc/kernel/setup_64.c | 2 +-
5 files changed, 20 insertions(+), 20 deletions(-)
diff --git a/arch/powerpc/include/asm/exception_trampoline.h b/arch/powerpc/include/asm/exception_trampoline.h
index 707ad6c..88281c9 100644
--- a/arch/powerpc/include/asm/exception_trampoline.h
+++ b/arch/powerpc/include/asm/exception_trampoline.h
@@ -1,10 +1,10 @@
#ifndef _EXCEPTION_TRAMPOLINE_H
#define _EXCEPTION_TRAMPOLINE_H
-/* How many bytes to reserve at zero for kdump. The reserve limit should
+/* How many bytes to reserve at zero for exception. The reserve limit should
* be greater or equal to the trampoline's end address.
* Reserve to the end of the FWNMI area, see head_64.S */
-#define KDUMP_RESERVE_LIMIT 0x10000 /* 64K */
+#define EXCEPTION_RESERVE_LIMIT 0x10000 /* 64K */
/*
* On PPC64 translation is disabled during trampoline setup, so we use
@@ -13,22 +13,22 @@
* branches, so we can just add the PAGE_OFFSET and don't worry about it.
*/
#ifdef __powerpc64__
-#define KDUMP_TRAMPOLINE_START 0x0100
-#define KDUMP_TRAMPOLINE_END 0x3000
+#define EXCEPTION_TRAMPOLINE_START 0x0100
+#define EXCEPTION_TRAMPOLINE_END 0x3000
#else
-#define KDUMP_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
-#define KDUMP_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
+#define EXCEPTION_TRAMPOLINE_START (0x0100 + PAGE_OFFSET)
+#define EXCEPTION_TRAMPOLINE_END (0x3000 + PAGE_OFFSET)
#endif /* __powerpc64__ */
#ifndef __ASSEMBLY__
#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
-extern void reserve_kdump_trampoline(void);
-extern void setup_kdump_trampoline(void);
+extern void reserve_exception_trampoline(void);
+extern void setup_exception_trampoline(void);
#else
/* !CRASH_DUMP || !NONSTATIC_KERNEL */
-static inline void reserve_kdump_trampoline(void) { ; }
-static inline void setup_kdump_trampoline(void) { ; }
+static inline void reserve_exception_trampoline(void) { ; }
+static inline void setup_exception_trampoline(void) { ; }
#endif
#endif /* __ASSEMBLY__ */
diff --git a/arch/powerpc/kernel/exception_trampoline.c b/arch/powerpc/kernel/exception_trampoline.c
index 71f4b72..b725116 100644
--- a/arch/powerpc/kernel/exception_trampoline.c
+++ b/arch/powerpc/kernel/exception_trampoline.c
@@ -15,7 +15,7 @@
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <asm/code-patching.h>
-#include <asm/kdump.h>
+#include <asm/exception_trampoline.h>
#include <asm/prom.h>
#include <asm/firmware.h>
#include <asm/uaccess.h>
@@ -29,9 +29,9 @@
#endif
#ifndef CONFIG_NONSTATIC_KERNEL
-void __init reserve_kdump_trampoline(void)
+void __init reserve_exception_trampoline(void)
{
- memblock_reserve(0, KDUMP_RESERVE_LIMIT);
+ memblock_reserve(0, EXCEPTION_RESERVE_LIMIT);
}
static void __init create_trampoline(unsigned long addr)
@@ -50,13 +50,13 @@ static void __init create_trampoline(unsigned long addr)
patch_branch(++p, addr + PHYSICAL_START, 0);
}
-void __init setup_kdump_trampoline(void)
+void __init setup_exception_trampoline(void)
{
unsigned long i;
- DBG(" -> setup_kdump_trampoline()\n");
+ DBG(" -> setup_exception_trampoline()\n");
- for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) {
+ for (i = EXCEPTION_TRAMPOLINE_START; i < EXCEPTION_TRAMPOLINE_END; i += 8) {
create_trampoline(i);
}
@@ -65,6 +65,6 @@ void __init setup_kdump_trampoline(void)
create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START);
#endif /* CONFIG_PPC_PSERIES */
- DBG(" <- setup_kdump_trampoline()\n");
+ DBG(" <- setup_exception_trampoline()\n");
}
#endif /* CONFIG_NONSTATIC_KERNEL */
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 4a13ac5..57214ee 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -669,7 +669,7 @@ void __init early_init_devtree(void *params)
/* If relocatable, reserve first 32k for interrupt vectors etc. */
if (PHYSICAL_START > MEMORY_START)
memblock_reserve(MEMORY_START, 0x8000);
- reserve_kdump_trampoline();
+ reserve_exception_trampoline();
#ifdef CONFIG_FA_DUMP
/*
* If we fail to reserve memory for firmware-assisted dump then
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 9f3aa43..e040bb2 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -133,7 +133,7 @@ notrace void __init machine_init(u64 dt_ptr)
probe_machine();
- setup_kdump_trampoline();
+ setup_exception_trampoline();
#ifdef CONFIG_6xx
if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 06b8562..b077847 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -222,7 +222,7 @@ void __init early_setup(unsigned long dt_ptr)
/* Probe the machine type */
probe_machine();
- setup_kdump_trampoline();
+ setup_exception_trampoline();
DBG("Found, Initializing memory management...\n");
--
1.8.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH 4/4] powerpc: make the kernel bootable from non 0 address for 6xx
2013-06-19 9:20 [PATCH 0/4] powerpc: enable relocatable support for 6xx Kevin Hao
` (2 preceding siblings ...)
2013-06-19 9:20 ` [PATCH 3/4] powerpc: s/kdump/exception/ for the exception trampoline functions Kevin Hao
@ 2013-06-19 9:20 ` Kevin Hao
3 siblings, 0 replies; 5+ messages in thread
From: Kevin Hao @ 2013-06-19 9:20 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linuxppc
Add the support to boot the kernel from a non 0 address for 6xx.
Setup the exception trampoline if the physical start address is
not 0.
For a kdump kernel, enable the relocatable support implicitly.
Since the memstart_adddr of the kdump is not 0, we definitely
should regard this when setting up the BAT map.
Signed-off-by: Kevin Hao <haokexin@gmail.com>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/include/asm/exception_trampoline.h | 4 ++--
arch/powerpc/kernel/Makefile | 3 ++-
arch/powerpc/kernel/exception_trampoline.c | 18 +++++++++++++++---
arch/powerpc/mm/ppc_mmu_32.c | 7 +------
5 files changed, 21 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 8fe2792..6e03028 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -382,7 +382,7 @@ config KEXEC
config CRASH_DUMP
bool "Build a kdump crash kernel"
depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
- select RELOCATABLE if PPC64 || 44x
+ select RELOCATABLE if PPC64 || 44x || 6xx
select DYNAMIC_MEMSTART if FSL_BOOKE
help
Build a kernel suitable for use as a kdump capture kernel.
diff --git a/arch/powerpc/include/asm/exception_trampoline.h b/arch/powerpc/include/asm/exception_trampoline.h
index 88281c9..df4af6a 100644
--- a/arch/powerpc/include/asm/exception_trampoline.h
+++ b/arch/powerpc/include/asm/exception_trampoline.h
@@ -22,11 +22,11 @@
#ifndef __ASSEMBLY__
-#if defined(CONFIG_CRASH_DUMP) && !defined(CONFIG_NONSTATIC_KERNEL)
+#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_6xx)
extern void reserve_exception_trampoline(void);
extern void setup_exception_trampoline(void);
#else
-/* !CRASH_DUMP || !NONSTATIC_KERNEL */
+/* !CONFIG_RELOCATABLE || !CONFIG_6xx */
static inline void reserve_exception_trampoline(void) { ; }
static inline void setup_exception_trampoline(void) { ; }
#endif
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index c73a0e3..c722156 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -59,7 +59,8 @@ obj-$(CONFIG_LPARCFG) += lparcfg.o
obj-$(CONFIG_IBMVIO) += vio.o
obj-$(CONFIG_IBMEBUS) += ibmebus.o
obj-$(CONFIG_GENERIC_TBSYNC) += smp-tbsync.o
-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o exception_trampoline.o
+obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
+obj-$(CONFIG_RELOCATABLE) += exception_trampoline.o
obj-$(CONFIG_FA_DUMP) += fadump.o
ifeq ($(CONFIG_PPC32),y)
obj-$(CONFIG_E500) += idle_e500.o
diff --git a/arch/powerpc/kernel/exception_trampoline.c b/arch/powerpc/kernel/exception_trampoline.c
index b725116..68aed9e 100644
--- a/arch/powerpc/kernel/exception_trampoline.c
+++ b/arch/powerpc/kernel/exception_trampoline.c
@@ -28,10 +28,16 @@
#define DBG(fmt...)
#endif
-#ifndef CONFIG_NONSTATIC_KERNEL
+#ifdef CONFIG_6xx
void __init reserve_exception_trampoline(void)
{
- memblock_reserve(0, EXCEPTION_RESERVE_LIMIT);
+ /*
+ * We don't need to reserve this memory region for a kdump kernel
+ * since this is not included in the memory regions of kdump kernel.
+ */
+
+ if (!memstart_addr && PHYSICAL_START)
+ memblock_reserve(0, EXCEPTION_RESERVE_LIMIT);
}
static void __init create_trampoline(unsigned long addr)
@@ -54,6 +60,12 @@ void __init setup_exception_trampoline(void)
{
unsigned long i;
+ if (!PHYSICAL_START)
+ return;
+
+ if (PHYSICAL_START > 0x2000000)
+ panic("Don't support to load a kernel above 32M address");
+
DBG(" -> setup_exception_trampoline()\n");
for (i = EXCEPTION_TRAMPOLINE_START; i < EXCEPTION_TRAMPOLINE_END; i += 8) {
@@ -67,4 +79,4 @@ void __init setup_exception_trampoline(void)
DBG(" <- setup_exception_trampoline()\n");
}
-#endif /* CONFIG_NONSTATIC_KERNEL */
+#endif /* CONFIG_6xx */
diff --git a/arch/powerpc/mm/ppc_mmu_32.c b/arch/powerpc/mm/ppc_mmu_32.c
index 11571e1..99ce477 100644
--- a/arch/powerpc/mm/ppc_mmu_32.c
+++ b/arch/powerpc/mm/ppc_mmu_32.c
@@ -86,7 +86,7 @@ unsigned long __init mmu_mapin_ram(unsigned long top)
/* Make sure we don't map a block larger than the
smallest alignment of the physical address. */
- tot = top;
+ tot = top + memstart_addr;
for (bl = 128<<10; bl < max_size; bl <<= 1) {
if (bl * 2 > tot)
break;
@@ -275,11 +275,6 @@ void __init MMU_init_hw(void)
void setup_initial_memory_limit(phys_addr_t first_memblock_base,
phys_addr_t first_memblock_size)
{
- /* We don't currently support the first MEMBLOCK not mapping 0
- * physical on those processors
- */
- BUG_ON(first_memblock_base != 0);
-
/* 601 can only access 16MB at the moment */
if (PVR_VER(mfspr(SPRN_PVR)) == 1)
memblock_set_current_limit(min_t(u64, first_memblock_size, 0x01000000));
--
1.8.1.4
^ permalink raw reply related [flat|nested] 5+ messages in thread