From: Tiejun Chen <tiejun.chen@xxxxxxxxxxxxx>
Allow KEXEC for book3e, and bypass or convert non-book3e stuff
in kexec code.
Signed-off-by: Tiejun Chen <tiejun.chen at windriver.com>
[scottwood at freescale.com: move code to minimize diff, and cleanup]
Signed-off-by: Scott Wood <scottwood at freescale.com>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/kernel/machine_kexec_64.c | 19 +++++++++++++++++++
arch/powerpc/kernel/misc_64.S | 6 ++++++
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 5ef2711..710dcdb 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -414,7 +414,7 @@ config PPC64_SUPPORTS_MEMORY_FAILURE
config KEXEC
bool "kexec system call"
- depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP))
+ depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index 1a74446..b0d42a7 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -30,6 +30,21 @@
#include <asm/smp.h>
#include <asm/hw_breakpoint.h>
+#ifdef CONFIG_PPC_BOOK3E
+int default_machine_kexec_prepare(struct kimage *image)
+{
+ int i;
+ /*
+ * Since we use the kernel fault handlers and paging code to
+ * handle the virtual mode, we must make sure no destination
+ * overlaps kernel static data or bss.
+ */
+ for (i = 0; i < image->nr_segments; i++)
+ if (image->segment[i].mem < __pa(_end))
+ return -ETXTBSY;
+ return 0;
+}
+#else
int default_machine_kexec_prepare(struct kimage *image)
{
int i;
@@ -95,6 +110,7 @@ int default_machine_kexec_prepare(struct kimage *image)
return 0;
}
+#endif /* !CONFIG_PPC_BOOK3E */
static void copy_segments(unsigned long ind)
{
@@ -365,6 +381,7 @@ void default_machine_kexec(struct kimage *image)
/* NOTREACHED */
}
+#ifndef CONFIG_PPC_BOOK3E
/* Values we need to export to the second kernel via the device tree. */
static unsigned long htab_base;
static unsigned long htab_size;
@@ -411,3 +428,5 @@ static int __init export_htab_values(void)
return 0;
}
late_initcall(export_htab_values);
+#endif /* !CONFIG_PPC_BOOK3E */
+
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index fb955d9..8cf0b8ae 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -624,9 +624,13 @@ _GLOBAL(kexec_sequence)
lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */
/* disable interrupts, we are overwriting kernel data next */
+#ifdef CONFIG_PPC_BOOK3E
+ wrteei 0
+#else
mfmsr r3
rlwinm r3,r3,0,17,15
mtmsrd r3,1
+#endif
/* copy dest pages, flush whole dest image */
mr r3,r29
@@ -648,6 +652,7 @@ _GLOBAL(kexec_sequence)
li r6,1
stw r6,kexec_flag-1b(5)
+#ifndef CONFIG_PPC_BOOK3E
/* clear out hardware hash page table and tlb */
#if !defined(_CALL_ELF) || _CALL_ELF != 2
ld r12,0(r27) /* deref function descriptor */
@@ -656,6 +661,7 @@ _GLOBAL(kexec_sequence)
#endif
mtctr r12
bctrl /* ppc_md.hpte_clear_all(void); */
+#endif /* !CONFIG_PPC_BOOK3E */
/*
* kexec image calling is:
--
2.1.4
