[PATCH 5/5] powerpc/kexec: Add support for FSL-BookE
Sebastian Andrzej Siewior
linuxppc-dev at ml.breakpoint.cc
Sat Jan 16 03:41:37 EST 2010
From: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
This adds support kexec on FSL-BookE where the MMU can not be simply
switched off. The code borrows the initial MMU-setup code to create the
identical mapping mapping. The only difference to the original boot code
is the size of the mapping(s) and the executeable address.
The kexec code maps the first 2 GiB of memory in 256 MiB steps. This
should work also on e500v1 boxes.
SMP support is still not available.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy at linutronix.de>
---
arch/powerpc/Kconfig | 2 +-
arch/powerpc/include/asm/kexec.h | 13 +++++++++
arch/powerpc/kernel/fsl_booke_entry_mapping.S | 34 +++++++++++++++++++++++++
arch/powerpc/kernel/head_fsl_booke.S | 2 +
arch/powerpc/kernel/misc_32.S | 17 ++++++++++++
5 files changed, 67 insertions(+), 1 deletions(-)
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index ba3948c..788a154 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -335,7 +335,7 @@ config ARCH_ENABLE_MEMORY_HOTREMOVE
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
- depends on PPC_BOOK3S && EXPERIMENTAL
+ depends on (PPC_BOOK3S || (FSL_BOOKE && !SMP)) && EXPERIMENTAL
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/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 7e06b43..83f6481 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -2,6 +2,18 @@
#define _ASM_POWERPC_KEXEC_H
#ifdef __KERNEL__
+#ifdef CONFIG_FSL_BOOKE
+
+/*
+ * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
+ * and therefore we can only deal with memory within this range
+ */
+#define KEXEC_SOURCE_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
+#define KEXEC_DESTINATION_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
+#define KEXEC_CONTROL_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL)
+
+#else
+
/*
* Maximum page that is mapped directly into kernel memory.
* XXX: Since we copy virt we can use any page we allocate
@@ -21,6 +33,7 @@
/* TASK_SIZE, probably left over from use_mm ?? */
#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
#endif
+#endif
#define KEXEC_CONTROL_PAGE_SIZE 4096
diff --git a/arch/powerpc/kernel/fsl_booke_entry_mapping.S b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
index d629618..1fc283a 100644
--- a/arch/powerpc/kernel/fsl_booke_entry_mapping.S
+++ b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
@@ -155,6 +155,8 @@ skpinv: addi r6,r6,1 /* Increment */
#define M_IF_SMP 0
#endif
+#if defined(ENTRY_MAPPING_BOOT_SETUP)
+
/* 6. Setup KERNELBASE mapping in TLB1[0] */
lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */
mtspr SPRN_MAS0,r6
@@ -170,6 +172,38 @@ skpinv: addi r6,r6,1 /* Increment */
/* 7. Jump to KERNELBASE mapping */
lis r6,(KERNELBASE & ~0xfff)@h
ori r6,r6,(KERNELBASE & ~0xfff)@l
+
+#elif defined(ENTRY_MAPPING_KEXEC_SETUP)
+/*
+ * 6. Setup 1:1 mapping TLB1[0 - 8]. We start 0 and map in 256 MiB steps the
+ * first 2GiB of memory.
+ */
+ lis r10, (MAS1_VALID|MAS1_IPROT)@h
+ ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l
+ li r11, 0 // We use 16 esel slots and map 4 GiB
+ li r0, 8 // of mem 1:1 from 0 to 4 GiB - 1 in
+ mtctr r0 // 256 MiB mem steps
+
+next_tlb_setup:
+ rlwinm r0, r11, 16, 4, 15 // Compute esel
+ rlwinm r9, r11, 28, 0, 3 // Compute [ER]PN
+ oris r0, r0, (MAS0_TLBSEL(1))@h
+ mtspr SPRN_MAS0,r0
+ mtspr SPRN_MAS1,r10
+ mtspr SPRN_MAS2,r9
+ ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR)
+ mtspr SPRN_MAS3,r9
+ tlbwe
+ addi r11, r11, 1
+ bdnz+ next_tlb_setup
+
+/* 7. Jump to KERNELBASE mapping */
+ li r6, 0
+
+#else
+ #error You need to specify the mapping or not use this at all.
+#endif
+
lis r7,MSR_KERNEL at h
ori r7,r7,MSR_KERNEL at l
bl 1f /* Find our address */
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 4de9bc5..fcace7b 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -95,7 +95,9 @@ _ENTRY(_start);
_ENTRY(__early_start)
+#define ENTRY_MAPPING_BOOT_SETUP
#include "fsl_booke_entry_mapping.S"
+#undef ENTRY_MAPPING_BOOT_SETUP
/* Establish the interrupt vector offsets */
SET_IVOR(0, CriticalInput);
diff --git a/arch/powerpc/kernel/misc_32.S b/arch/powerpc/kernel/misc_32.S
index 8649f53..99bc652 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -706,6 +706,22 @@ relocate_new_kernel:
/* r4 = reboot_code_buffer */
/* r5 = start_address */
+#ifdef CONFIG_FSL_BOOKE
+
+ mr r29, r3
+ mr r30, r4
+ mr r31, r5
+
+#define ENTRY_MAPPING_KEXEC_SETUP
+#include "fsl_booke_entry_mapping.S"
+#undef ENTRY_MAPPING_KEXEC_SETUP
+
+ mr r3, r29
+ mr r4, r30
+ mr r5, r31
+
+ li r0, 0
+#else
li r0, 0
/*
@@ -722,6 +738,7 @@ relocate_new_kernel:
rfi
1:
+#endif
/* from this point address translation is turned off */
/* and interrupts are disabled */
--
1.6.2.5
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