powerpc/kexec: Add support for FSL-BookE
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.
(Kumar: Added minor change to build to ifdef CONFIG_PPC_STD_MMU_64 some
code that was PPC64 specific)
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/crash.c b/arch/powerpc/kernel/crash.c
index 8c066d6..b46f2e0 100644
--- a/arch/powerpc/kernel/crash.c
+++ b/arch/powerpc/kernel/crash.c
@@ -163,6 +163,7 @@
}
/* wait for all the CPUs to hit real mode but timeout if they don't come in */
+#ifdef CONFIG_PPC_STD_MMU_64
static void crash_kexec_wait_realmode(int cpu)
{
unsigned int msecs;
@@ -187,6 +188,7 @@
}
mb();
}
+#endif
/*
* This function will be called by secondary cpus or by kexec cpu
@@ -445,7 +447,9 @@
crash_kexec_prepare_cpus(crashing_cpu);
cpu_set(crashing_cpu, cpus_in_crash);
crash_kexec_stop_spus();
+#ifdef CONFIG_PPC_STD_MMU_64
crash_kexec_wait_realmode(crashing_cpu);
+#endif
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(1, 0);
}
diff --git a/arch/powerpc/kernel/fsl_booke_entry_mapping.S b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
index cdb1296..beb4d78 100644
--- a/arch/powerpc/kernel/fsl_booke_entry_mapping.S
+++ b/arch/powerpc/kernel/fsl_booke_entry_mapping.S
@@ -159,6 +159,8 @@
#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
@@ -174,6 +176,41 @@
/* 7. Jump to KERNELBASE mapping */
lis r6,(KERNELBASE & ~0xfff)@h
ori r6,r6,(KERNELBASE & ~0xfff)@l
+
+#elif defined(ENTRY_MAPPING_KEXEC_SETUP)
+/*
+ * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp
+ * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This
+ * will cover the first 2GiB of memory.
+ */
+
+ lis r10, (MAS1_VALID|MAS1_IPROT)@h
+ ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l
+ li r11, 0
+ li r0, 8
+ mtctr r0
+
+next_tlb_setup:
+ addi r0, r11, 3
+ rlwinm r0, r0, 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 our 1:1 mapping */
+ li r6, 0
+
+#else
+ #error You need to specify the mapping or not use this at all.
+#endif
+
lis r7,MSR_KERNEL@h
ori r7,r7,MSR_KERNEL@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 6b5b1f3..4faeba2 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -95,7 +95,9 @@
_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 8043d1b..dc66d52 100644
--- a/arch/powerpc/kernel/misc_32.S
+++ b/arch/powerpc/kernel/misc_32.S
@@ -711,6 +711,22 @@
/* 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
/*
@@ -727,6 +743,7 @@
rfi
1:
+#endif
/* from this point address translation is turned off */
/* and interrupts are disabled */