- I have implemented a first cut of kexec hardboot patch for the Apollo and Thor Devices
- @Tasssadar created the excellent MultiROM
- I am working to provide support for our devices (Apollo and Thor) and as such this is first step
- The commit in my SlimLP kernel is here.
- This is the patch:
- @Tasssadar created the excellent MultiROM
- I am working to provide support for our devices (Apollo and Thor) and as such this is first step
- The commit in my SlimLP kernel is here.
- This is the patch:
Code:
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9468df5..a8b637a 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2249,6 +2249,32 @@ config ATAGS_PROC
Should the atags used to boot the kernel be exported in an "atags"
file in procfs. Useful with kexec.
+config KEXEC_HARDBOOT
+ bool "Support hard booting to a kexec kernel"
+ depends on KEXEC
+ help
+ Allows hard booting (i.e., with a full hardware reboot) to a kernel
+ previously loaded in memory by kexec. This works around the problem of
+ soft-booted kernel hangs due to improper device shutdown and/or
+ reinitialization. Support is comprised of two components:
+
+ First, a "hardboot" flag is added to the kexec syscall to force a hard
+ reboot in relocate_new_kernel() (which requires machine-specific assembly
+ code). This also requires the kexec userspace tool to load the kexec'd
+ kernel in memory region left untouched by the bootloader (i.e., not
+ explicitly cleared and not overwritten by the boot kernel). Just prior
+ to reboot, the kexec kernel arguments are stashed in a machine-specific
+ memory page that must also be preserved. Note that this hardboot page
+ need not be reserved during regular kernel execution.
+
+ Second, the zImage decompresor of the boot (bootloader-loaded) kernel is
+ modified to check the hardboot page for fresh kexec arguments, and if
+ present, attempts to jump to the kexec'd kernel preserved in memory.
+
+ Note that hardboot support is only required in the boot kernel and any
+ kernel capable of performing a hardboot kexec. It is _not_ required by a
+ kexec'd kernel.
+
config CRASH_DUMP
bool "Build kdump crash kernel (EXPERIMENTAL)"
depends on EXPERIMENTAL
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 64a6d6f..6c9d423 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -10,6 +10,13 @@
*/
#include <linux/linkage.h>
+ .arch armv7-a
+
+#ifdef CONFIG_KEXEC_HARDBOOT
+ #include <asm/kexec.h>
+ #include <asm/memory.h>
+#endif
+
/*
* Debugging stuff
*
@@ -135,6 +142,64 @@ start:
1: mov r7, r1 @ save architecture ID
mov r8, r2 @ save atags pointer
+#ifdef CONFIG_KEXEC_HARDBOOT
+ /* Check hardboot page for a kexec kernel. */
+ ldr r3, =KEXEC_HB_PAGE_ADDR
+ ldr r0, [r3]
+ ldr r1, =KEXEC_HB_PAGE_MAGIC
+ teq r0, r1
+ bne not_booting_other
+
+ /* Clear hardboot page magic to avoid boot loop. */
+ mov r0, #0
+ str r0, [r3]
+
+ /*
+ * Copy dtb from location up high in memory to default location.
+ * Kernel freezes if this is not done.
+ */
+ ldr r1, [r3, #12] @ kexec_boot_atags
+ ldr r2, [r3, #16] @ kexec_boot_atags_len
+ mov r5, #0 @ iterator
+catags_cpy:
+ ldr r0, [r1, r5] @ from kexec_boot_atags
+ str r0, [r8, r5] @ to atags_pointer
+ add r5, r5, #4
+ cmp r5, r2
+ blo catags_cpy
+
+#ifdef KEXEC_HB_KERNEL_LOC
+ /*
+ * Copy kernel from location up high in memory to location in first 128MB.
+ * Bootloader on hammerhead erases first 128MB of ram on reboot, so it can't
+ * be in there before reboot, but decompressing in location above 128MB takes
+ * a long time. This memcpy is much quicker, for some reason.
+ */
+ ldr r2, [r3, #4] @ kexec_start_address
+ ldr r4, [r3, #20] @ kexec_kernel_len
+ ldr r6, =KEXEC_HB_KERNEL_LOC @ target
+ mov r5, #0 @ iterator
+kernel_cpy:
+ ldr r0, [r2, r5] @ from kexec_start_address
+ str r0, [r6, r5] @ to KEXEC_HB_KERNEL_LOC
+ add r5, r5, #4
+ cmp r5, r4
+ blo kernel_cpy
+#else
+ ldr r6, [r3, #4] @ kexec_start_address
+#endif
+
+ /* set registers and boot kexecd' kernel */
+ mov r0, #0
+ ldr r1, [r3, #8] @ kexec_mach_type
+ mov r2, r8 @ atags pointer
+ mov pc, r6
+
+ .ltorg
+
+not_booting_other:
+#endif
+
#ifndef __ARM_ARCH_2__
/*
* Booting from Angel - need to enter SVC mode and disable
@@ -176,7 +241,19 @@ not_angel:
ldr r4, =zreladdr
#endif
- bl cache_on
+ /*
+ * Set up a page table only if it won't overwrite ourself.
+ * That means r4 < pc && r4 - 16k page directory > &_end.
+ * Given that r4 > &_end is most unfrequent, we add a rough
+ * additional 1MB of room for a possible appended DTB.
+ */
+ mov r0, pc
+ cmp r0, r4
+ ldrcc r0, LC0+32
+ addcc r0, r0, pc
+ cmpcc r4, r0
+ orrcc r4, r4, #1 @ remember we skipped cache_on
+ blcs cache_on
restart: adr r0, LC0
ldmia r0, {r1, r2, r3, r6, r10, r11, r12}
@@ -222,7 +299,7 @@ restart: adr r0, LC0
* r0 = delta
* r2 = BSS start
* r3 = BSS end
- * r4 = final kernel address
+ * r4 = final kernel address (possibly with LSB set)
* r5 = appended dtb size (still unknown)
* r6 = _edata
* r7 = architecture ID
@@ -270,6 +347,7 @@ restart: adr r0, LC0
*/
cmp r0, #1
sub r0, r4, #TEXT_OFFSET
+ bic r0, r0, #1
add r0, r0, #0x100
mov r1, r6
sub r2, sp, r6
@@ -316,12 +394,13 @@ dtb_check_done:
/*
* Check to see if we will overwrite ourselves.
- * r4 = final kernel address
+ * r4 = final kernel address (possibly with LSB set)
* r9 = size of decompressed image
* r10 = end of this image, including bss/stack/malloc space if non XIP
* We basically want:
* r4 - 16k page directory >= r10 -> OK
* r4 + image length <= address of wont_overwrite -> OK
+ * Note: the possible LSB in r4 is harmless here.
*/
add r10, r10, #16384
cmp r4, r10
@@ -369,7 +448,8 @@ dtb_check_done:
add sp, sp, r6
#endif
- bl cache_clean_flush
+ tst r4, #1
+ bleq cache_clean_flush
adr r0, BSYM(restart)
add r0, r0, r6
@@ -381,7 +461,7 @@ wont_overwrite:
* r0 = delta
* r2 = BSS start
* r3 = BSS end
- * r4 = kernel execution address
+ * r4 = kernel execution address (possibly with LSB set)
* r5 = appended dtb size (0 if not present)
* r7 = architecture ID
* r8 = atags pointer
@@ -444,6 +524,15 @@ not_relocated: mov r0, #0
cmp r2, r3
blo 1b
+ /*
+ * Did we skip the cache setup earlier?
+ * That is indicated by the LSB in r4.
+ * Do it now if so.
+ */
+ tst r4, #1
+ bic r4, r4, #1
+ blne cache_on
+
/*
* The C runtime environment should now be setup sufficiently.
* Set up some pointers, and start decompressing.
@@ -474,6 +563,7 @@ LC0: .word LC0 @ r1
.word _got_start @ r11
.word _got_end @ ip
.word .L_user_stack_end @ sp
+ .word _end - restart + 16384 + 1024*1024
.size LC0, . - LC0
#ifdef CONFIG_ARCH_RPC
@@ -510,6 +600,7 @@ cache_on: mov r3, #8 @ cache_on function
* to cover all 32bit address and cacheable and bufferable.
*/
__armv4_mpu_cache_on:
+ .arch armv4
mov r0, #0x3f @ 4G, the whole
mcr p15, 0, r0, c6, c7, 0 @ PR7 Area Setting
mcr p15, 0, r0, c6, c7, 1
@@ -614,13 +705,24 @@ __setup_mmu: sub r3, r4, #16384 @ Page directory size
mov pc, lr
ENDPROC(__setup_mmu)
+@ Enable unaligned access on v6, to allow better code generation
+@ for the decompressor C code:
+__armv6_mmu_cache_on:
+ mrc p15, 0, r0, c1, c0, 0 @ read SCTLR
+ bic r0, r0, #2 @ A (no unaligned access fault)
+ orr r0, r0, #1 << 22 @ U (v6 unaligned access model)
+ mcr p15, 0, r0, c1, c0, 0 @ write SCTLR
+ b __armv4_mmu_cache_on
+
__arm926ejs_mmu_cache_on:
#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+ .arch armv5
mov r0, #4 @ put dcache in WT mode
mcr p15, 7, r0, c15, c0, 0
#endif
__armv4_mmu_cache_on:
+ .arch armv4
mov r12, lr
#ifdef CONFIG_MMU
mov r6, #CB_BITS | 0x12 @ U
@@ -641,6 +743,7 @@ __armv4_mmu_cache_on:
mov pc, r12
__armv7_mmu_cache_on:
+ .arch armv7-a
mov r12, lr
#ifdef CONFIG_MMU
mrc p15, 0, r11, c0, c1, 4 @ read ID_MMFR0
@@ -653,8 +756,12 @@ __armv7_mmu_cache_on:
mcrne p15, 0, r0, c8, c7, 0 @ flush I,D TLBs
#endif
mrc p15, 0, r0, c1, c0, 0 @ read control reg
+ bic r0, r0, #1 << 28 @ clear SCTLR.TRE
orr r0, r0, #0x5000 @ I-cache enable, RR cache replacement
orr r0, r0, #0x003c @ write buffer
+ bic r0, r0, #2 @ A (no unaligned access fault)
+ orr r0, r0, #1 << 22 @ U (v6 unaligned access model)
+ @ (needed for ARM1176)
#ifdef CONFIG_MMU
#ifdef CONFIG_CPU_ENDIAN_BE8
orr r0, r0, #1 << 25 @ big-endian page tables
@@ -687,6 +794,7 @@ __fa526_cache_on:
mov pc, r12
__arm6_mmu_cache_on:
+ .arch armv6
mov r12, lr
mov r6, #CB_BITS | 0x12 @ U
bl __setup_mmu
@@ -895,7 +1003,7 @@ proc_types:
.word 0x0007b000 @ ARMv6
.word 0x000ff000
- W(b) __armv4_mmu_cache_on
+ W(b) __armv6_mmu_cache_on
W(b) __armv4_mmu_cache_off
W(b) __armv6_mmu_cache_flush
@@ -1015,7 +1123,10 @@ cache_clean_flush:
mov r3, #16
b call_cache_fn
+ .arch armv4
__armv4_mpu_cache_flush:
+ tst r4, #1
+ movne pc, lr
mov r2, #1
mov r3, #0
mcr p15, 0, ip, c7, c6, 0 @ invalidate D cache
@@ -1033,6 +1144,8 @@ __armv4_mpu_cache_flush:
mov pc, lr
__fa526_cache_flush:
+ tst r4, #1
+ movne pc, lr
mov r1, #0
mcr p15, 0, r1, c7, c14, 0 @ clean and invalidate D cache
mcr p15, 0, r1, c7, c5, 0 @ flush I cache
@@ -1040,14 +1153,19 @@ __fa526_cache_flush:
mov pc, lr
__armv6_mmu_cache_flush:
+ .arch armv6
mov r1, #0
- mcr p15, 0, r1, c7, c14, 0 @ clean+invalidate D
+ tst r4, #1
+ mcreq p15, 0, r1, c7, c14, 0 @ clean+invalidate D
mcr p15, 0, r1, c7, c5, 0 @ invalidate I+BTB
- mcr p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
+ mcreq p15, 0, r1, c7, c15, 0 @ clean+invalidate unified
mcr p15, 0, r1, c7, c10, 4 @ drain WB
mov pc, lr
+ .arch armv7-a
__armv7_mmu_cache_flush:
+ tst r4, #1
+ bne iflush
mrc p15, 0, r10, c0, c1, 5 @ read ID_MMFR1
tst r10, #0xf << 16 @ hierarchical cache (ARMv7)
mov r10, #0
@@ -1107,14 +1225,20 @@ iflush:
mcr p15, 0, r10, c7, c5, 4 @ ISB
mov pc, lr
+ .arch armv5
__armv5tej_mmu_cache_flush:
+ tst r4, #1
+ movne pc, lr
1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate D cache
bne 1b
mcr p15, 0, r0, c7, c5, 0 @ flush I cache
mcr p15, 0, r0, c7, c10, 4 @ drain WB
mov pc, lr
+ .arch armv4
__armv4_mmu_cache_flush:
+ tst r4, #1
+ movne pc, lr
mov r2, #64*1024 @ default: 32K dcache size (*2)
mov r11, #32 @ default: 32 byte line size
mrc p15, 0, r3, c0, c0, 1 @ read cache type
@@ -1148,10 +1272,14 @@ no_cache_id:
__armv3_mmu_cache_flush:
__armv3_mpu_cache_flush:
+ tst r4, #1
+ movne pc, lr
mov r1, #0
mcr p15, 0, r1, c7, c0, 0 @ invalidate whole cache v3
mov pc, lr
+ .arch armv4
+
/*
* Various debugging routines for printing hex characters and
* memory, which again must be relocatable.
diff --git a/arch/arm/configs/apollo-android_defconfig b/arch/arm/configs/apollo-android_defconfig
index 4f143ea..1d498b6 100644
--- a/arch/arm/configs/apollo-android_defconfig
+++ b/arch/arm/configs/apollo-android_defconfig
@@ -674,7 +674,8 @@ CONFIG_ZBOOT_ROM_BSS=0
# CONFIG_ARM_APPENDED_DTB is not set
CONFIG_CMDLINE=""
# CONFIG_XIP_KERNEL is not set
-# CONFIG_KEXEC is not set
+CONFIG_KEXEC=y
+CONFIG_KEXEC_HARDBOOT=y
# CONFIG_CRASH_DUMP is not set
# CONFIG_AUTO_ZRELADDR is not set
diff --git a/arch/arm/include/asm/kexec.h b/arch/arm/include/asm/kexec.h
index c2b9b4b..564c55b 100644
--- a/arch/arm/include/asm/kexec.h
+++ b/arch/arm/include/asm/kexec.h
@@ -17,6 +17,10 @@
#define KEXEC_ARM_ATAGS_OFFSET 0x1000
#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
+#ifdef CONFIG_KEXEC_HARDBOOT
+ #define KEXEC_HB_PAGE_MAGIC 0x4a5db007
+#endif
+
#ifndef __ASSEMBLY__
/**
@@ -53,6 +57,10 @@ static inline void crash_setup_regs(struct pt_regs *newregs,
/* Function pointer to optional machine-specific reinitialization */
extern void (*kexec_reinit)(void);
+#ifdef CONFIG_KEXEC_HARDBOOT
+extern void (*kexec_hardboot_hook)(void);
+#endif
+
#endif /* __ASSEMBLY__ */
#endif /* CONFIG_KEXEC */
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index c355aeb..29cdd2f 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -14,6 +14,9 @@
#include <asm/cacheflush.h>
#include <asm/mach-types.h>
#include <asm/system_misc.h>
+#include <linux/memblock.h>
+#include <linux/of_fdt.h>
+#include <asm/mmu_writeable.h>
extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
@@ -22,6 +25,12 @@ extern unsigned long kexec_start_address;
extern unsigned long kexec_indirection_page;
extern unsigned long kexec_mach_type;
extern unsigned long kexec_boot_atags;
+#ifdef CONFIG_KEXEC_HARDBOOT
+extern unsigned long kexec_hardboot;
+extern unsigned long kexec_boot_atags_len;
+extern unsigned long kexec_kernel_len;
+void (*kexec_hardboot_hook)(void);
+#endif
static atomic_t waiting_for_crash_ipi;
@@ -32,6 +41,37 @@ static atomic_t waiting_for_crash_ipi;
int machine_kexec_prepare(struct kimage *image)
{
+ struct kexec_segment *current_segment;
+ __be32 header;
+ int i, err;
+
+ /* No segment at default ATAGs address. try to locate
+ * a dtb using magic */
+ for (i = 0; i < image->nr_segments; i++) {
+ current_segment = &image->segment[i];
+
+ err = memblock_is_region_memory(current_segment->mem,
+ current_segment->memsz);
+ if (!err)
+ return - EINVAL;
+
+#ifdef CONFIG_KEXEC_HARDBOOT
+ if(current_segment->mem == image->start)
+ mem_text_write_kernel_word(&kexec_kernel_len, current_segment->memsz);
+#endif
+
+ err = get_user(header, (__be32*)current_segment->buf);
+ if (err)
+ return err;
+
+ if (be32_to_cpu(header) == OF_DT_HEADER)
+ {
+ mem_text_write_kernel_word(&kexec_boot_atags, current_segment->mem);
+#ifdef CONFIG_KEXEC_HARDBOOT
+ mem_text_write_kernel_word(&kexec_boot_atags_len, current_segment->memsz);
+#endif
+ }
+ }
return 0;
}
@@ -110,7 +150,10 @@ void machine_kexec(struct kimage *image)
unsigned long reboot_code_buffer_phys;
void *reboot_code_buffer;
- arch_kexec();
+ if (num_online_cpus() > 1) {
+ pr_err("kexec: error: multiple CPUs still online\n");
+ return;
+ }
page_list = image->head & PAGE_MASK;
@@ -120,10 +163,14 @@ void machine_kexec(struct kimage *image)
reboot_code_buffer = page_address(image->control_code_page);
/* Prepare parameters for reboot_code_buffer*/
- kexec_start_address = image->start;
- kexec_indirection_page = page_list;
- kexec_mach_type = machine_arch_type;
- kexec_boot_atags = image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET;
+ mem_text_write_kernel_word(&kexec_start_address, image->start);
+ mem_text_write_kernel_word(&kexec_indirection_page, page_list);
+ mem_text_write_kernel_word(&kexec_mach_type, machine_arch_type);
+ if (!kexec_boot_atags)
+ mem_text_write_kernel_word(&kexec_boot_atags, image->start - KEXEC_ARM_ZIMAGE_OFFSET + KEXEC_ARM_ATAGS_OFFSET);
+#ifdef CONFIG_KEXEC_HARDBOOT
+ mem_text_write_kernel_word(&kexec_hardboot, image->hardboot);
+#endif
/* copy our kernel relocation code to the control code page */
memcpy(reboot_code_buffer,
@@ -137,5 +184,18 @@ void machine_kexec(struct kimage *image)
if (kexec_reinit)
kexec_reinit();
+#ifdef CONFIG_KEXEC_HARDBOOT
+ /* Run any final machine-specific shutdown code. */
+ if (image->hardboot && kexec_hardboot_hook)
+ kexec_hardboot_hook();
+#endif
+
soft_restart(reboot_code_buffer_phys);
}
+
+void arch_crash_save_vmcoreinfo(void)
+{
+#ifdef CONFIG_ARM_LPAE
+ VMCOREINFO_CONFIG(ARM_LPAE);
+#endif
+}
diff --git a/arch/arm/kernel/relocate_kernel.S b/arch/arm/kernel/relocate_kernel.S
index d0cdedf..0e45ffc 100644
--- a/arch/arm/kernel/relocate_kernel.S
+++ b/arch/arm/kernel/relocate_kernel.S
@@ -4,6 +4,15 @@
#include <asm/kexec.h>
+#ifdef CONFIG_KEXEC_HARDBOOT
+#include <asm/memory.h>
+#if defined(CONFIG_ARCH_TEGRA_2x_SOC) || defined(CONFIG_ARCH_TEGRA_3x_SOC)
+ #include <mach/iomap.h>
+#elif defined(CONFIG_ARCH_APQ8064) || defined(CONFIG_ARCH_MSM8974)
+ #include <mach/msm_iomap.h>
+#endif
+#endif
+
.globl relocate_new_kernel
relocate_new_kernel:
@@ -52,6 +61,12 @@ relocate_new_kernel:
b 0b
2:
+#ifdef CONFIG_KEXEC_HARDBOOT
+ ldr r0, kexec_hardboot
+ teq r0, #0
+ bne hardboot
+#endif
+
/* Jump to relocated kernel */
mov lr,r1
mov r0,#0
@@ -60,6 +75,52 @@ relocate_new_kernel:
ARM( mov pc, lr )
THUMB( bx lr )
+#ifdef CONFIG_KEXEC_HARDBOOT
+hardboot:
+ /* Stash boot arguments in hardboot page:
+ * 0: KEXEC_HB_PAGE_MAGIC
+ * 4: kexec_start_address
+ * 8: kexec_mach_type
+ * 12: kexec_boot_atags
+ * 16: kexec_boot_atags_len
+ * 20: kexec_kernel_len */
+ ldr r0, =KEXEC_HB_PAGE_ADDR
+ str r1, [r0, #4]
+ ldr r1, kexec_mach_type
+ str r1, [r0, #8]
+ ldr r1, kexec_boot_atags
+ str r1, [r0, #12]
+ ldr r1, kexec_boot_atags_len
+ str r1, [r0, #16]
+ ldr r1, kexec_kernel_len
+ str r1, [r0, #20]
+ ldr r1, =KEXEC_HB_PAGE_MAGIC
+ str r1, [r0]
+
+#if defined(CONFIG_ARCH_TEGRA_2x_SOC) || defined(CONFIG_ARCH_TEGRA_3x_SOC)
+ ldr r0, =TEGRA_PMC_BASE
+ ldr r1, [r0]
+ orr r1, r1, #0x10
+ str r1, [r0]
+loop: b loop
+#elif defined(CONFIG_ARCH_APQ8064)
+ /* Restart using the PMIC chip, see mach-msm/restart.c */
+ ldr r0, =APQ8064_TLMM_PHYS
+ mov r1, #0
+ str r1, [r0, #0x820] @ PSHOLD_CTL_SU
+loop: b loop
+#elif defined(CONFIG_ARCH_MSM8974)
+ /* Restart using the PMIC chip, see mach-msm/restart.c */
+ ldr r0, =MSM8974_MPM2_PSHOLD_PHYS
+ mov r1, #0
+ str r1, [r0, #0]
+loop: b loop
+#else
+#error "No reboot method defined for hardboot."
+#endif
+
+ .ltorg
+#endif
.align
.globl kexec_start_address
@@ -79,6 +140,20 @@ kexec_mach_type:
kexec_boot_atags:
.long 0x0
+#ifdef CONFIG_KEXEC_HARDBOOT
+ .globl kexec_boot_atags_len
+kexec_boot_atags_len:
+ .long 0x0
+
+ .globl kexec_kernel_len
+kexec_kernel_len:
+ .long 0x0
+
+ .globl kexec_hardboot
+kexec_hardboot:
+ .long 0x0
+#endif
+
relocate_new_kernel_end:
.globl relocate_new_kernel_size
diff --git a/arch/arm/mach-msm/board-8974.c b/arch/arm/mach-msm/board-8974.c
index 6d52ccc..21b40dd 100644
--- a/arch/arm/mach-msm/board-8974.c
+++ b/arch/arm/mach-msm/board-8974.c
@@ -52,6 +52,13 @@
#include "amzn_ram_console.h"
#endif
+#ifdef CONFIG_KEXEC_HARDBOOT
+#include <asm/setup.h>
+#include <asm/memory.h>
+#include <linux/memblock.h>
+#define HDX_PERSISTENT_RAM_SIZE (SZ_1M)
+#endif
+
#if defined(CONFIG_ARCH_MSM8974_THOR) || defined(CONFIG_ARCH_MSM8974_APOLLO)
enum WLANBT_STATUS {
WLANOFF_BTOFF = 1,
@@ -84,12 +91,35 @@ static struct reserve_info msm8974_reserve_info __initdata = {
void __init msm_8974_reserve(void)
{
+#ifdef CONFIG_KEXEC_HARDBOOT
+ // Reserve space for hardboot page - just after ram_console,
+ // at the start of second memory bank
+ int ret;
+ phys_addr_t start;
+ struct membank* bank;
+#endif
+
reserve_info = &msm8974_reserve_info;
of_scan_flat_dt(dt_scan_for_memory_reserve, msm8974_reserve_table);
msm_reserve();
#if defined(CONFIG_AMZN_RAM_CONSOLE) && (defined(CONFIG_ARCH_MSM8974_THOR) || defined(CONFIG_ARCH_MSM8974_APOLLO))
amzn_ram_console_init(AMZN_RAM_CONSOLE_START_DEFAULT, AMZN_RAM_CONSOLE_SIZE_DEFAULT);
#endif
+
+#ifdef CONFIG_KEXEC_HARDBOOT
+ if (meminfo.nr_banks < 2) {
+ pr_err("%s: not enough membank\n", __func__);
+ return;
+ }
+
+ bank = &meminfo.bank[1];
+ start = bank->start + SZ_1M + HDX_PERSISTENT_RAM_SIZE;
+ ret = memblock_remove(start, SZ_1M);
+ if(!ret)
+ pr_info("Hardboot page reserved at 0x%X\n", start);
+ else
+ pr_err("Failed to reserve space for hardboot page at 0x%X!\n", start);
+#endif
}
static void __init msm8974_early_memory(void)
diff --git a/arch/arm/mach-msm/include/mach/memory.h b/arch/arm/mach-msm/include/mach/memory.h
index 6119a3c..abe4882 100644
--- a/arch/arm/mach-msm/include/mach/memory.h
+++ b/arch/arm/mach-msm/include/mach/memory.h
@@ -20,6 +20,15 @@
/* physical offset of RAM */
#define PLAT_PHYS_OFFSET UL(CONFIG_PHYS_OFFSET)
+#if defined(CONFIG_KEXEC_HARDBOOT)
+#if defined(CONFIG_ARCH_MSM8974_THOR) || defined(CONFIG_ARCH_MSM8974_APOLLO)
+#define KEXEC_HB_PAGE_ADDR UL(0x2F600000)
+#define KEXEC_HB_KERNEL_LOC UL(0x3208000)
+#else
+#error "Adress for kexec hardboot page not defined"
+#endif
+#endif
+
#define MAX_PHYSMEM_BITS 32
#define SECTION_SIZE_BITS 28
diff --git a/arch/arm/mach-msm/restart.c b/arch/arm/mach-msm/restart.c
index a96b02f..da157a4 100644
--- a/arch/arm/mach-msm/restart.c
+++ b/arch/arm/mach-msm/restart.c
@@ -38,6 +38,10 @@
#include "timer.h"
#include "wdog_debug.h"
+#ifdef CONFIG_KEXEC_HARDBOOT
+#include <asm/kexec.h>
+#endif
+
#define WDT0_RST 0x38
#define WDT0_EN 0x40
#define WDT0_BARK_TIME 0x4C
@@ -351,6 +355,26 @@ static int __init msm_pmic_restart_init(void)
late_initcall(msm_pmic_restart_init);
+#ifdef CONFIG_KEXEC_HARDBOOT
+static void msm_kexec_hardboot_hook(void)
+{
+ set_dload_mode(0);
+
+ // Set PMIC to restart-on-poweroff
+ pm8xxx_reset_pwr_off(1);
+
+ // These are executed on normal reboot, but with kexec-hardboot,
+ // they reboot/panic the system immediately.
+#if 0
+ qpnp_pon_system_pwr_off(PON_POWER_OFF_WARM_RESET);
+
+ /* Needed to bypass debug image on some chips */
+ msm_disable_wdog_debug();
+ halt_spmi_pmic_arbiter();
+#endif
+}
+#endif
+
static int __init msm_restart_init(void)
{
#ifdef CONFIG_MSM_DLOAD_MODE
@@ -367,6 +391,10 @@ static int __init msm_restart_init(void)
if (scm_is_call_available(SCM_SVC_PWR, SCM_IO_DISABLE_PMIC_ARBITER) > 0)
scm_pmic_arbiter_disable_supported = true;
+#ifdef CONFIG_KEXEC_HARDBOOT
+ kexec_hardboot_hook = msm_kexec_hardboot_hook;
+#endif
+
return 0;
}
early_initcall(msm_restart_init);
diff --git a/include/linux/kexec.h b/include/linux/kexec.h
index af84a25..a4509ad 100644
--- a/include/linux/kexec.h
+++ b/include/linux/kexec.h
@@ -111,6 +111,10 @@ struct kimage {
#define KEXEC_TYPE_CRASH 1
unsigned int preserve_context : 1;
+#ifdef CONFIG_KEXEC_HARDBOOT
+ unsigned int hardboot : 1;
+#endif
+
#ifdef ARCH_HAS_KIMAGE_ARCH
struct kimage_arch arch;
#endif
@@ -178,6 +182,11 @@ extern struct kimage *kexec_crash_image;
#define KEXEC_ON_CRASH 0x00000001
#define KEXEC_PRESERVE_CONTEXT 0x00000002
+
+#ifdef CONFIG_KEXEC_HARDBOOT
+#define KEXEC_HARDBOOT 0x00000004
+#endif
+
#define KEXEC_ARCH_MASK 0xffff0000
/* These values match the ELF architecture values.
@@ -196,10 +205,14 @@ extern struct kimage *kexec_crash_image;
#define KEXEC_ARCH_MIPS ( 8 << 16)
/* List of defined/legal kexec flags */
-#ifndef CONFIG_KEXEC_JUMP
-#define KEXEC_FLAGS KEXEC_ON_CRASH
-#else
+#if defined(CONFIG_KEXEC_JUMP) && defined(CONFIG_KEXEC_HARDBOOT)
+#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT | KEXEC_HARDBOOT)
+#elif defined(CONFIG_KEXEC_JUMP)
#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_PRESERVE_CONTEXT)
+#elif defined(CONFIG_KEXEC_HARDBOOT)
+#define KEXEC_FLAGS (KEXEC_ON_CRASH | KEXEC_HARDBOOT)
+#else
+#define KEXEC_FLAGS (KEXEC_ON_CRASH)
#endif
#define VMCOREINFO_BYTES (4096)
diff --git a/kernel/kexec.c b/kernel/kexec.c
index 4e2e472..aef7893 100644
--- a/kernel/kexec.c
+++ b/kernel/kexec.c
@@ -1004,6 +1004,10 @@ SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
if (flags & KEXEC_PRESERVE_CONTEXT)
image->preserve_context = 1;
+#ifdef CONFIG_KEXEC_HARDBOOT
+ if (flags & KEXEC_HARDBOOT)
+ image->hardboot = 1;
+#endif
result = machine_kexec_prepare(image);
if (result)
goto out;
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