diff -purN -X /home/mbligh/.diff.exclude reference/MAINTAINERS current/MAINTAINERS
--- reference/MAINTAINERS Thu Jun 17 12:57:18 2004
+++ current/MAINTAINERS Wed Jun 16 16:08:24 2004
@@ -1207,6 +1207,15 @@ W: http://nfs.sourceforge.net/
W: http://www.cse.unsw.edu.au/~neilb/patches/linux-devel/
S: Maintained
+KEXEC
+P: Eric Biederman
+M: ebiederm@xmission.com
+M: ebiederman@lnxi.com
+W: http://www.xmission.com/~ebiederm/files/kexec/
+L: linux-kernel@vger.kernel.org
+L: fastboot@osdl.org
+S: Maintained
+
LANMEDIA WAN CARD DRIVER
P: Andrew Stanley-Jones
M: asj@lanmedia.com
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/Kconfig current/arch/i386/Kconfig
--- reference/arch/i386/Kconfig Thu Jun 17 12:57:23 2004
+++ current/arch/i386/Kconfig Wed Jun 16 16:08:24 2004
@@ -931,6 +931,23 @@ config REGPARM
generate incorrect output with certain kernel constructs when
-mregparm=3 is used.
+config KEXEC
+ bool "kexec system call (EXPERIMENTAL)"
+ depends on 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
+ but it is indepedent of the system firmware. And like a reboot
+ you can start any kernel with it, not just Linux.
+
+ The name comes from the similiarity to the exec system call.
+
+ It is an ongoing process to be certain the hardware in a machine
+ is properly shutdown, so do not be surprised if this code does not
+ initially work for you. It may help to enable device hotplugging
+ support. As of this writing the exact hardware interface is
+ strongly in flux, so no good recommendation can be made.
+
endmenu
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/defconfig current/arch/i386/defconfig
--- reference/arch/i386/defconfig Wed Jun 16 08:19:15 2004
+++ current/arch/i386/defconfig Wed Jun 16 16:08:24 2004
@@ -94,6 +94,7 @@ CONFIG_SMP=y
CONFIG_NR_CPUS=8
CONFIG_SCHED_SMT=y
CONFIG_PREEMPT=y
+CONFIG_KEXEC=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_TSC=y
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/Makefile current/arch/i386/kernel/Makefile
--- reference/arch/i386/kernel/Makefile Thu Jun 17 12:57:20 2004
+++ current/arch/i386/kernel/Makefile Wed Jun 16 16:08:24 2004
@@ -24,6 +24,7 @@ obj-$(CONFIG_X86_TRAMPOLINE) += trampoli
obj-$(CONFIG_X86_MPPARSE) += mpparse.o
obj-$(CONFIG_X86_LOCAL_APIC) += apic.o nmi.o
obj-$(CONFIG_X86_IO_APIC) += io_apic.o
+obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
obj-$(CONFIG_X86_NUMAQ) += numaq.o
obj-$(CONFIG_X86_SUMMIT_NUMA) += summit.o
obj-$(CONFIG_MODULES) += module.o
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/apic.c current/arch/i386/kernel/apic.c
--- reference/arch/i386/kernel/apic.c Thu Jun 17 12:57:21 2004
+++ current/arch/i386/kernel/apic.c Wed Jun 16 16:08:24 2004
@@ -26,6 +26,7 @@
#include <linux/mc146818rtc.h>
#include <linux/kernel_stat.h>
#include <linux/sysdev.h>
+#include <linux/reboot.h>
#include <asm/atomic.h>
#include <asm/smp.h>
@@ -183,6 +184,39 @@ void disconnect_bsp_APIC(void)
outb(0x70, 0x22);
outb(0x00, 0x23);
}
+#ifdef CONFIG_KEXEC
+ else {
+ /* Go back to Virtual Wire compatibility mode */
+ unsigned long value;
+
+ /* For the spurious interrupt use vector F, and enable it */
+ value = apic_read(APIC_SPIV);
+ value &= ~APIC_VECTOR_MASK;
+ value |= APIC_SPIV_APIC_ENABLED;
+ value |= 0xf;
+ apic_write_around(APIC_SPIV, value);
+
+ /* For LVT0 make it edge triggered, active high, external and enabled */
+ value = apic_read(APIC_LVT0);
+ value &= ~(APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED );
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_EXINT);
+ apic_write_around(APIC_LVT0, value);
+
+ /* For LVT1 make it edge triggered, active high, nmi and enabled */
+ value = apic_read(APIC_LVT1);
+ value &= ~(
+ APIC_MODE_MASK | APIC_SEND_PENDING |
+ APIC_INPUT_POLARITY | APIC_LVT_REMOTE_IRR |
+ APIC_LVT_LEVEL_TRIGGER | APIC_LVT_MASKED);
+ value |= APIC_LVT_REMOTE_IRR | APIC_SEND_PENDING;
+ value = SET_APIC_DELIVERY_MODE(value, APIC_MODE_NMI);
+ apic_write_around(APIC_LVT1, value);
+ }
+#endif /* CONFIG_KEXEC */
+
}
void disable_local_APIC(void)
@@ -1153,6 +1187,28 @@ asmlinkage void smp_error_interrupt(void
printk (KERN_INFO "APIC error on CPU%d: %02lx(%02lx)\n",
smp_processor_id(), v , v1);
irq_exit();
+}
+
+void stop_apics(void)
+{
+ /* By resetting the APIC's we disable the nmi watchdog */
+#if CONFIG_SMP
+ /*
+ * Stop all CPUs and turn off local APICs and the IO-APIC, so
+ * other OSs see a clean IRQ state.
+ */
+ smp_send_stop();
+#else
+ if (cpu_has_apic) {
+ local_irq_disable();
+ disable_local_APIC();
+ local_irq_enable();
+ }
+#endif
+#if defined(CONFIG_X86_IO_APIC)
+ disable_IO_APIC();
+#endif
+ disconnect_bsp_APIC();
}
/*
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/dmi_scan.c current/arch/i386/kernel/dmi_scan.c
--- reference/arch/i386/kernel/dmi_scan.c Wed Jun 16 08:19:15 2004
+++ current/arch/i386/kernel/dmi_scan.c Wed Jun 16 16:08:24 2004
@@ -216,31 +216,6 @@ static __init int set_bios_reboot(struct
return 0;
}
-/*
- * Some machines require the "reboot=s" commandline option, this quirk makes that automatic.
- */
-static __init int set_smp_reboot(struct dmi_blacklist *d)
-{
-#ifdef CONFIG_SMP
- extern int reboot_smp;
- if (reboot_smp == 0)
- {
- reboot_smp = 1;
- printk(KERN_INFO "%s series board detected. Selecting SMP-method for reboots.\n", d->ident);
- }
-#endif
- return 0;
-}
-
-/*
- * Some machines require the "reboot=b,s" commandline option, this quirk makes that automatic.
- */
-static __init int set_smp_bios_reboot(struct dmi_blacklist *d)
-{
- set_smp_reboot(d);
- set_bios_reboot(d);
- return 0;
-}
/*
* Some bioses have a broken protected mode poweroff and need to use realmode
@@ -612,7 +587,7 @@ static __initdata struct dmi_blacklist d
MATCH(DMI_BIOS_VERSION, "4.60 PGMA"),
MATCH(DMI_BIOS_DATE, "134526184"), NO_MATCH
} },
- { set_smp_bios_reboot, "Dell PowerEdge 1300", { /* Handle problems with rebooting on Dell 1300's */
+ { set_bios_reboot, "Dell PowerEdge 1300", { /* Handle problems with rebooting on Dell 1300's */
MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"),
NO_MATCH, NO_MATCH
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/entry.S current/arch/i386/kernel/entry.S
--- reference/arch/i386/kernel/entry.S Thu Jun 17 12:57:20 2004
+++ current/arch/i386/kernel/entry.S Wed Jun 16 16:08:24 2004
@@ -1050,6 +1050,6 @@ ENTRY(sys_call_table)
.long sys_mq_timedreceive /* 280 */
.long sys_mq_notify
.long sys_mq_getsetattr
- .long sys_ni_syscall /* reserved for kexec */
+ .long sys_kexec_load
syscall_table_size=(.-sys_call_table)
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/i8259.c current/arch/i386/kernel/i8259.c
--- reference/arch/i386/kernel/i8259.c Tue Jun 15 11:09:27 2004
+++ current/arch/i386/kernel/i8259.c Wed Jun 16 16:08:24 2004
@@ -244,9 +244,21 @@ static int i8259A_resume(struct sys_devi
return 0;
}
+static int i8259A_shutdown(struct sys_device *dev)
+{
+ /* Put the i8259A into a quiescent state that
+ * the kernel initialization code can get it
+ * out of.
+ */
+ outb(0xff, 0x21); /* mask all of 8259A-1 */
+ outb(0xff, 0xA1); /* mask all of 8259A-1 */
+ return 0;
+}
+
static struct sysdev_class i8259_sysdev_class = {
set_kset_name("i8259"),
.resume = i8259A_resume,
+ .shutdown = i8259A_shutdown,
};
static struct sys_device device_i8259A = {
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/io_apic.c current/arch/i386/kernel/io_apic.c
--- reference/arch/i386/kernel/io_apic.c Thu Jun 17 12:57:21 2004
+++ current/arch/i386/kernel/io_apic.c Wed Jun 16 16:08:24 2004
@@ -1643,8 +1643,6 @@ void disable_IO_APIC(void)
* Clear the IO-APIC before rebooting:
*/
clear_IO_APIC();
-
- disconnect_bsp_APIC();
}
/*
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/machine_kexec.c current/arch/i386/kernel/machine_kexec.c
--- reference/arch/i386/kernel/machine_kexec.c Wed Dec 31 16:00:00 1969
+++ current/arch/i386/kernel/machine_kexec.c Wed Jun 16 16:08:24 2004
@@ -0,0 +1,122 @@
+/*
+ * machine_kexec.c - handle transition of Linux booting another kernel
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/kexec.h>
+#include <linux/delay.h>
+#include <asm/pgtable.h>
+#include <asm/pgalloc.h>
+#include <asm/tlbflush.h>
+#include <asm/mmu_context.h>
+#include <asm/io.h>
+#include <asm/apic.h>
+#include <asm/cpufeature.h>
+
+
+static void set_idt(void *newidt, __u16 limit)
+{
+ unsigned char curidt[6];
+
+ /* ia32 supports unaliged loads & stores */
+ (*(__u16 *)(curidt)) = limit;
+ (*(__u32 *)(curidt +2)) = (unsigned long)(newidt);
+
+ __asm__ __volatile__ (
+ "lidt %0\n"
+ : "=m" (curidt)
+ );
+};
+
+
+static void set_gdt(void *newgdt, __u16 limit)
+{
+ unsigned char curgdt[6];
+
+ /* ia32 supports unaligned loads & stores */
+ (*(__u16 *)(curgdt)) = limit;
+ (*(__u32 *)(curgdt +2)) = (unsigned long)(newgdt);
+
+ __asm__ __volatile__ (
+ "lgdt %0\n"
+ : "=m" (curgdt)
+ );
+};
+
+static void load_segments(void)
+{
+#define __STR(X) #X
+#define STR(X) __STR(X)
+
+ __asm__ __volatile__ (
+ "\tljmp $"STR(__KERNEL_CS)",$1f\n"
+ "\t1:\n"
+ "\tmovl $"STR(__KERNEL_DS)",%eax\n"
+ "\tmovl %eax,%ds\n"
+ "\tmovl %eax,%es\n"
+ "\tmovl %eax,%fs\n"
+ "\tmovl %eax,%gs\n"
+ "\tmovl %eax,%ss\n"
+ );
+#undef STR
+#undef __STR
+}
+
+typedef void (*relocate_new_kernel_t)(
+ unsigned long indirection_page, unsigned long reboot_code_buffer,
+ unsigned long start_address, unsigned int has_pae);
+
+const extern unsigned char relocate_new_kernel[];
+extern void relocate_new_kernel_end(void);
+const extern unsigned int relocate_new_kernel_size;
+extern void use_mm(struct mm_struct *mm);
+
+/*
+ * Do not allocate memory (or fail in any way) in machine_kexec().
+ * We are past the point of no return, committed to rebooting now.
+ */
+void machine_kexec(struct kimage *image)
+{
+ unsigned long indirection_page;
+ unsigned long reboot_code_buffer;
+ relocate_new_kernel_t rnk;
+
+ /* switch to an mm where the reboot_code_buffer is identity mapped */
+ use_mm(&init_mm);
+ stop_apics();
+
+ /* Interrupts aren't acceptable while we reboot */
+ local_irq_disable();
+ reboot_code_buffer = page_to_pfn(image->reboot_code_pages) << PAGE_SHIFT;
+ indirection_page = image->head & PAGE_MASK;
+
+ /* copy it out */
+ memcpy((void *)reboot_code_buffer, relocate_new_kernel, relocate_new_kernel_size);
+
+ /* The segment registers are funny things, they are
+ * automatically loaded from a table, in memory wherever you
+ * set them to a specific selector, but this table is never
+ * accessed again you set the segment to a different selector.
+ *
+ * The more common model is are caches where the behide
+ * the scenes work is done, but is also dropped at arbitrary
+ * times.
+ *
+ * I take advantage of this here by force loading the
+ * segments, before I zap the gdt with an invalid value.
+ */
+ load_segments();
+ /* The gdt & idt are now invalid.
+ * If you want to load them you must set up your own idt & gdt.
+ */
+ set_gdt(phys_to_virt(0),0);
+ set_idt(phys_to_virt(0),0);
+
+ /* now call it */
+ rnk = (relocate_new_kernel_t) reboot_code_buffer;
+ (*rnk)(indirection_page, reboot_code_buffer, image->start, cpu_has_pae);
+}
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/reboot.c current/arch/i386/kernel/reboot.c
--- reference/arch/i386/kernel/reboot.c Thu Jun 17 12:57:20 2004
+++ current/arch/i386/kernel/reboot.c Wed Jun 16 16:08:24 2004
@@ -22,8 +22,7 @@ static int reboot_mode;
int reboot_thru_bios;
#ifdef CONFIG_SMP
-int reboot_smp = 0;
-static int reboot_cpu = -1;
+int reboot_cpu = -1; /* specifies the internal linux cpu id, not the apicid */
/* shamelessly grabbed from lib/vsprintf.c for readability */
#define is_digit(c) ((c) >= '0' && (c) <= '9')
#endif
@@ -45,7 +44,6 @@ static int __init reboot_setup(char *str
break;
#ifdef CONFIG_SMP
case 's': /* "smp" reboot by executing reset on BSP or other CPU*/
- reboot_smp = 1;
if (is_digit(*(str+1))) {
reboot_cpu = (int) (*(str+1) - '0');
if (is_digit(*(str+2)))
@@ -218,50 +216,7 @@ void machine_real_restart(unsigned char
void machine_restart(char * __unused)
{
-#ifdef CONFIG_SMP
- int cpuid;
-
- cpuid = GET_APIC_ID(apic_read(APIC_ID));
-
- if (reboot_smp) {
-
- /* check to see if reboot_cpu is valid
- if its not, default to the BSP */
- if ((reboot_cpu == -1) ||
- (reboot_cpu > (NR_CPUS -1)) ||
- !physid_isset(cpuid, phys_cpu_present_map))
- reboot_cpu = boot_cpu_physical_apicid;
-
- reboot_smp = 0; /* use this as a flag to only go through this once*/
- /* re-run this function on the other CPUs
- it will fall though this section since we have
- cleared reboot_smp, and do the reboot if it is the
- correct CPU, otherwise it halts. */
- if (reboot_cpu != cpuid)
- smp_call_function((void *)machine_restart , NULL, 1, 0);
- }
-
- /* if reboot_cpu is still -1, then we want a tradional reboot,
- and if we are not running on the reboot_cpu,, halt */
- if ((reboot_cpu != -1) && (cpuid != reboot_cpu)) {
- for (;;)
- __asm__ __volatile__ ("hlt");
- }
- /*
- * Stop all CPUs and turn off local APICs and the IO-APIC, so
- * other OSs see a clean IRQ state.
- */
- smp_send_stop();
-#elif defined(CONFIG_X86_LOCAL_APIC)
- if (cpu_has_apic) {
- local_irq_disable();
- disable_local_APIC();
- local_irq_enable();
- }
-#endif
-#ifdef CONFIG_X86_IO_APIC
- disable_IO_APIC();
-#endif
+ stop_apics();
if (!reboot_thru_bios) {
if (efi_enabled) {
@@ -288,12 +243,14 @@ EXPORT_SYMBOL(machine_restart);
void machine_halt(void)
{
+ stop_apics();
}
EXPORT_SYMBOL(machine_halt);
void machine_power_off(void)
{
+ stop_apics();
if (efi_enabled)
efi.reset_system(EFI_RESET_SHUTDOWN, EFI_SUCCESS, 0, 0);
if (pm_power_off)
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/relocate_kernel.S current/arch/i386/kernel/relocate_kernel.S
--- reference/arch/i386/kernel/relocate_kernel.S Wed Dec 31 16:00:00 1969
+++ current/arch/i386/kernel/relocate_kernel.S Wed Jun 16 16:08:24 2004
@@ -0,0 +1,118 @@
+/*
+ * relocate_kernel.S - put the kernel image in place to boot
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/linkage.h>
+
+ /*
+ * Must be relocatable PIC code callable as a C function, that once
+ * it starts can not use the previous processes stack.
+ */
+ .globl relocate_new_kernel
+relocate_new_kernel:
+ /* read the arguments and say goodbye to the stack */
+ movl 4(%esp), %ebx /* indirection_page */
+ movl 8(%esp), %ebp /* reboot_code_buffer */
+ movl 12(%esp), %edx /* start address */
+ movl 16(%esp), %ecx /* cpu_has_pae */
+
+ /* zero out flags, and disable interrupts */
+ pushl $0
+ popfl
+
+ /* set a new stack at the bottom of our page... */
+ lea 4096(%ebp), %esp
+
+ /* store the parameters back on the stack */
+ pushl %edx /* store the start address */
+
+ /* Set cr0 to a known state:
+ * 31 0 == Paging disabled
+ * 18 0 == Alignment check disabled
+ * 16 0 == Write protect disabled
+ * 3 0 == No task switch
+ * 2 0 == Don't do FP software emulation.
+ * 0 1 == Proctected mode enabled
+ */
+ movl %cr0, %eax
+ andl $~((1<<31)|(1<<18)|(1<<16)|(1<<3)|(1<<2)), %eax
+ orl $(1<<0), %eax
+ movl %eax, %cr0
+
+ /* clear cr4 if applicable */
+ testl %ecx, %ecx
+ jz 1f
+ /* Set cr4 to a known state:
+ * Setting everything to zero seems safe.
+ */
+ movl %cr4, %eax
+ andl $0, %eax
+ movl %eax, %cr4
+
+ jmp 1f
+1:
+
+ /* Flush the TLB (needed?) */
+ xorl %eax, %eax
+ movl %eax, %cr3
+
+ /* Do the copies */
+ cld
+0: /* top, read another word for the indirection page */
+ movl %ebx, %ecx
+ movl (%ebx), %ecx
+ addl $4, %ebx
+ testl $0x1, %ecx /* is it a destination page */
+ jz 1f
+ movl %ecx, %edi
+ andl $0xfffff000, %edi
+ jmp 0b
+1:
+ testl $0x2, %ecx /* is it an indirection page */
+ jz 1f
+ movl %ecx, %ebx
+ andl $0xfffff000, %ebx
+ jmp 0b
+1:
+ testl $0x4, %ecx /* is it the done indicator */
+ jz 1f
+ jmp 2f
+1:
+ testl $0x8, %ecx /* is it the source indicator */
+ jz 0b /* Ignore it otherwise */
+ movl %ecx, %esi /* For every source page do a copy */
+ andl $0xfffff000, %esi
+
+ movl $1024, %ecx
+ rep ; movsl
+ jmp 0b
+
+2:
+
+ /* To be certain of avoiding problems with self-modifying code
+ * I need to execute a serializing instruction here.
+ * So I flush the TLB, it's handy, and not processor dependent.
+ */
+ xorl %eax, %eax
+ movl %eax, %cr3
+
+ /* set all of the registers to known values */
+ /* leave %esp alone */
+
+ xorl %eax, %eax
+ xorl %ebx, %ebx
+ xorl %ecx, %ecx
+ xorl %edx, %edx
+ xorl %esi, %esi
+ xorl %edi, %edi
+ xorl %ebp, %ebp
+ ret
+relocate_new_kernel_end:
+
+ .globl relocate_new_kernel_size
+relocate_new_kernel_size:
+ .long relocate_new_kernel_end - relocate_new_kernel
diff -purN -X /home/mbligh/.diff.exclude reference/arch/i386/kernel/smp.c current/arch/i386/kernel/smp.c
--- reference/arch/i386/kernel/smp.c Thu Jun 17 12:57:20 2004
+++ current/arch/i386/kernel/smp.c Wed Jun 16 16:08:24 2004
@@ -567,6 +567,30 @@ static void stop_this_cpu (void * dummy)
void smp_send_stop(void)
{
+ extern int reboot_cpu;
+ int reboot_cpu_id;
+
+ /* The boot cpu is always logical cpu 0 */
+ reboot_cpu_id = 0;
+
+ /* See if there has been give a command line override.
+ */
+ if ((reboot_cpu != -1) && !(reboot_cpu >= NR_CPUS) &&
+ test_bit(reboot_cpu, &cpu_online_map)) {
+ reboot_cpu_id = reboot_cpu;
+ }
+
+ /* Make certain the the cpu I'm rebooting on is online */
+ if (!test_bit(reboot_cpu_id, &cpu_online_map)) {
+ reboot_cpu_id = smp_processor_id();
+ }
+
+ /* Make certain I only run on the appropriate processor */
+ set_cpus_allowed(current, 1 << reboot_cpu_id);
+
+ /* O.K. Now that I'm on the appropriate processor, stop
+ * all of the others.
+ */
smp_call_function(stop_this_cpu, NULL, 1, 0);
local_irq_disable();
diff -purN -X /home/mbligh/.diff.exclude reference/fs/aio.c current/fs/aio.c
--- reference/fs/aio.c Thu Jun 17 12:57:21 2004
+++ current/fs/aio.c Wed Jun 16 16:08:24 2004
@@ -538,7 +538,7 @@ struct kioctx *lookup_ioctx(unsigned lon
return ioctx;
}
-static void use_mm(struct mm_struct *mm)
+void use_mm(struct mm_struct *mm)
{
struct mm_struct *active_mm;
diff -purN -X /home/mbligh/.diff.exclude reference/include/asm-i386/apic.h current/include/asm-i386/apic.h
--- reference/include/asm-i386/apic.h Tue Jun 15 11:09:33 2004
+++ current/include/asm-i386/apic.h Wed Jun 16 16:08:24 2004
@@ -99,6 +99,9 @@ extern unsigned int nmi_watchdog;
#define NMI_LOCAL_APIC 2
#define NMI_INVALID 3
+extern void stop_apics(void);
+#else
+static inline void stop_apics(void) { }
#endif /* CONFIG_X86_LOCAL_APIC */
#endif /* __ASM_APIC_H */
diff -purN -X /home/mbligh/.diff.exclude reference/include/asm-i386/apicdef.h current/include/asm-i386/apicdef.h
--- reference/include/asm-i386/apicdef.h Wed Dec 17 18:58:56 2003
+++ current/include/asm-i386/apicdef.h Wed Jun 16 16:08:24 2004
@@ -86,6 +86,7 @@
#define APIC_LVT_REMOTE_IRR (1<<14)
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
+#define APIC_MODE_MASK 0x700
#define GET_APIC_DELIVERY_MODE(x) (((x)>>8)&0x7)
#define SET_APIC_DELIVERY_MODE(x,y) (((x)&~0x700)|((y)<<8))
#define APIC_MODE_FIXED 0x0
diff -purN -X /home/mbligh/.diff.exclude reference/include/asm-i386/kexec.h current/include/asm-i386/kexec.h
--- reference/include/asm-i386/kexec.h Wed Dec 31 16:00:00 1969
+++ current/include/asm-i386/kexec.h Wed Jun 16 16:08:24 2004
@@ -0,0 +1,23 @@
+#ifndef _I386_KEXEC_H
+#define _I386_KEXEC_H
+
+#include <asm/fixmap.h>
+
+/*
+ * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
+ * I.e. Maximum page that is mapped directly into kernel memory,
+ * and kmap is not required.
+ *
+ * Someone correct me if FIXADDR_START - PAGEOFFSET is not the correct
+ * calculation for the amount of memory directly mappable into the
+ * kernel memory space.
+ */
+
+/* Maximum physical address we can use pages from */
+#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
+/* Maximum address we can reach in physical address mode */
+#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
+
+#define KEXEC_REBOOT_CODE_SIZE 4096
+
+#endif /* _I386_KEXEC_H */
diff -purN -X /home/mbligh/.diff.exclude reference/include/linux/kexec.h current/include/linux/kexec.h
--- reference/include/linux/kexec.h Wed Dec 31 16:00:00 1969
+++ current/include/linux/kexec.h Wed Jun 16 16:08:24 2004
@@ -0,0 +1,53 @@
+#ifndef LINUX_KEXEC_H
+#define LINUX_KEXEC_H
+
+#if CONFIG_KEXEC
+#include <linux/types.h>
+#include <linux/list.h>
+#include <asm/kexec.h>
+
+/*
+ * This structure is used to hold the arguments that are used when loading
+ * kernel binaries.
+ */
+
+typedef unsigned long kimage_entry_t;
+#define IND_DESTINATION 0x1
+#define IND_INDIRECTION 0x2
+#define IND_DONE 0x4
+#define IND_SOURCE 0x8
+
+#define KEXEC_SEGMENT_MAX 8
+struct kexec_segment {
+ void *buf;
+ size_t bufsz;
+ void *mem;
+ size_t memsz;
+};
+
+struct kimage {
+ kimage_entry_t head;
+ kimage_entry_t *entry;
+ kimage_entry_t *last_entry;
+
+ unsigned long destination;
+ unsigned long offset;
+
+ unsigned long start;
+ struct page *reboot_code_pages;
+
+ unsigned long nr_segments;
+ struct kexec_segment segment[KEXEC_SEGMENT_MAX+1];
+
+ struct list_head dest_pages;
+ struct list_head unuseable_pages;
+};
+
+
+/* kexec interface functions */
+extern void machine_kexec(struct kimage *image);
+extern asmlinkage long sys_kexec(unsigned long entry, long nr_segments,
+ struct kexec_segment *segments);
+extern struct kimage *kexec_image;
+#endif
+#endif /* LINUX_KEXEC_H */
diff -purN -X /home/mbligh/.diff.exclude reference/kernel/Makefile current/kernel/Makefile
--- reference/kernel/Makefile Thu Jun 17 12:57:21 2004
+++ current/kernel/Makefile Wed Jun 16 16:08:24 2004
@@ -18,6 +18,7 @@ obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_PM) += power/
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
+obj-$(CONFIG_KEXEC) += kexec.o
obj-$(CONFIG_COMPAT) += compat.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_IKCONFIG_PROC) += configs.o
diff -purN -X /home/mbligh/.diff.exclude reference/kernel/kexec.c current/kernel/kexec.c
--- reference/kernel/kexec.c Wed Dec 31 16:00:00 1969
+++ current/kernel/kexec.c Wed Jun 16 16:08:24 2004
@@ -0,0 +1,639 @@
+/*
+ * kexec.c - kexec system call
+ * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2. See the file COPYING for more details.
+ */
+
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/version.h>
+#include <linux/compile.h>
+#include <linux/kexec.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/highmem.h>
+#include <net/checksum.h>
+#include <asm/page.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/system.h>
+
+/* When kexec transitions to the new kernel there is a one to one
+ * mapping between physical and virtual addresses. On processors
+ * where you can disable the MMU this is trivial, and easy. For
+ * others it is still a simple predictable page table to setup.
+ *
+ * In that environment kexec copies the new kernel to it's final
+ * resting place. This means I can only support memory whose
+ * physical address can fit in an unsigned long. In particular
+ * addresses where (pfn << PAGE_SHIFT) > ULONG_MAX cannot be handled.
+ * If the assembly stub has more restrictive requirements
+ * KEXEC_SOURCE_MEMORY_LIMIT and KEXEC_DEST_MEMORY_LIMIT can be
+ * defined more restrictively in <asm/kexec.h>.
+ *
+ * The code for the transition from the current kernel to the
+ * the new kernel is placed in the reboot_code_buffer, whose size
+ * is given by KEXEC_REBOOT_CODE_SIZE. In the best case only a single
+ * page of memory is necessary, but some architectures require more.
+ * Because this memory must be identity mapped in the transition from
+ * virtual to physical addresses it must live in the range
+ * 0 - TASK_SIZE, as only the user space mappings are arbitrarily
+ * modifyable.
+ *
+ * The assembly stub in the reboot code buffer is passed a linked list
+ * of descriptor pages detailing the source pages of the new kernel,
+ * and the destination addresses of those source pages. As this data
+ * structure is not used in the context of the current OS, it must
+ * be self contained.
+ *
+ * The code has been made to work with highmem pages and will use a
+ * destination page in it's final resting place (if it happens
+ * to allocate it). The end product of this is that most of the
+ * physical address space, and most of ram can be used.
+ *
+ * Future directions include:
+ * - allocating a page table with the reboot code buffer identity
+ * mapped, to simplify machine_kexec and make kexec_on_panic, more
+ * reliable.
+ * - allocating the pages for a page table for machines that cannot
+ * disable their MMUs. (Hammer, Alpha...)
+ */
+
+/* KIMAGE_NO_DEST is an impossible destination address..., for
+ * allocating pages whose destination address we do not care about.
+ */
+#define KIMAGE_NO_DEST (-1UL)
+
+static int kimage_is_destination_range(
+ struct kimage *image, unsigned long start, unsigned long end);
+static struct page *kimage_alloc_reboot_code_pages(struct kimage *image);
+static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mask, unsigned long dest);
+
+
+static int kimage_alloc(struct kimage **rimage,
+ unsigned long nr_segments, struct kexec_segment *segments)
+{
+ int result;
+ struct kimage *image;
+ size_t segment_bytes;
+ struct page *reboot_pages;
+ unsigned long i;
+
+ /* Allocate a controlling structure */
+ result = -ENOMEM;
+ image = kmalloc(sizeof(*image), GFP_KERNEL);
+ if (!image) {
+ goto out;
+ }
+ memset(image, 0, sizeof(*image));
+ image->head = 0;
+ image->entry = &image->head;
+ image->last_entry = &image->head;
+
+ /* Initialize the list of destination pages */
+ INIT_LIST_HEAD(&image->dest_pages);
+
+ /* Initialize the list of unuseable pages */
+ INIT_LIST_HEAD(&image->unuseable_pages);
+
+ /* Read in the segments */
+ image->nr_segments = nr_segments;
+ segment_bytes = nr_segments * sizeof*segments;
+ result = copy_from_user(image->segment, segments, segment_bytes);
+ if (result)
+ goto out;
+
+ /* Verify we have good destination addresses. The caller is
+ * responsible for making certain we don't attempt to load
+ * the new image into invalid or reserved areas of RAM. This
+ * just verifies it is an address we can use.
+ */
+ result = -EADDRNOTAVAIL;
+ for(i = 0; i < nr_segments; i++) {
+ unsigned long mend;
+ mend = ((unsigned long)(image->segment[i].mem)) +
+ image->segment[i].memsz;
+ if (mend >= KEXEC_DESTINATION_MEMORY_LIMIT)
+ goto out;
+ }
+
+ /* Find a location for the reboot code buffer, and add it
+ * the vector of segments so that it's pages will also be
+ * counted as destination pages.
+ */
+ result = -ENOMEM;
+ reboot_pages = kimage_alloc_reboot_code_pages(image);
+ if (!reboot_pages) {
+ printk(KERN_ERR "Could not allocate reboot_code_buffer\n");
+ goto out;
+ }
+ image->reboot_code_pages = reboot_pages;
+ image->segment[nr_segments].buf = 0;
+ image->segment[nr_segments].bufsz = 0;
+ image->segment[nr_segments].mem = (void *)(page_to_pfn(reboot_pages) << PAGE_SHIFT);
+ image->segment[nr_segments].memsz = KEXEC_REBOOT_CODE_SIZE;
+ image->nr_segments++;
+
+ result = 0;
+ out:
+ if (result == 0) {
+ *rimage = image;
+ } else {
+ kfree(image);
+ }
+ return result;
+}
+
+static int kimage_is_destination_range(
+ struct kimage *image, unsigned long start, unsigned long end)
+{
+ unsigned long i;
+ for(i = 0; i < image->nr_segments; i++) {
+ unsigned long mstart, mend;
+ mstart = (unsigned long)image->segment[i].mem;
+ mend = mstart + image->segment[i].memsz;
+ if ((end > mstart) && (start < mend)) {
+ return 1;
+ }
+ }
+ return 0;
+}
+
+#ifdef CONFIG_MMU
+static int identity_map_pages(struct page *pages, int order)
+{
+ struct mm_struct *mm;
+ struct vm_area_struct *vma;
+ int error;
+ mm = &init_mm;
+ vma = 0;
+
+ down_write(&mm->mmap_sem);
+ error = -ENOMEM;
+ vma = kmem_cache_alloc(vm_area_cachep, SLAB_KERNEL);
+ if (!vma) {
+ goto out;
+ }
+
+ memset(vma, 0, sizeof(*vma));
+ vma->vm_mm = mm;
+ vma->vm_start = page_to_pfn(pages) << PAGE_SHIFT;
+ vma->vm_end = vma->vm_start + (1 << (order + PAGE_SHIFT));
+ vma->vm_ops = 0;
+ vma->vm_flags = VM_SHARED \
+ | VM_READ | VM_WRITE | VM_EXEC \
+ | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC \
+ | VM_DONTCOPY | VM_RESERVED;
+ vma->vm_page_prot = protection_map[vma->vm_flags & 0xf];
+ vma->vm_file = NULL;
+ vma->vm_private_data = NULL;
+ INIT_LIST_HEAD(&vma->shared);
+ insert_vm_struct(mm, vma);
+
+ error = remap_page_range(vma, vma->vm_start, vma->vm_start,
+ vma->vm_end - vma->vm_start, vma->vm_page_prot);
+ if (error) {
+ goto out;
+ }
+
+ error = 0;
+ out:
+ if (error && vma) {
+ kmem_cache_free(vm_area_cachep, vma);
+ vma = 0;
+ }
+ up_write(&mm->mmap_sem);
+
+ return error;
+}
+#else
+#define identity_map_pages(pages, order) 0
+#endif
+
+struct page *kimage_alloc_reboot_code_pages(struct kimage *image)
+{
+ /* The reboot code buffer is special. It is the only set of
+ * pages that must be allocated in their final resting place,
+ * and the only set of pages whose final resting place we can
+ * pick.
+ *
+ * At worst this runs in O(N) of the image size.
+ */
+ struct list_head extra_pages, *pos, *next;
+ struct page *pages;
+ unsigned long addr;
+ int order, count;
+ order = get_order(KEXEC_REBOOT_CODE_SIZE);
+ count = 1 << order;
+ INIT_LIST_HEAD(&extra_pages);
+ do {
+ int i;
+ pages = alloc_pages(GFP_KERNEL, order);
+ if (!pages)
+ break;
+ for(i = 0; i < count; i++) {
+ SetPageReserved(pages +i);
+ }
+ addr = page_to_pfn(pages) << PAGE_SHIFT;
+ if ((page_to_pfn(pages) >= (TASK_SIZE >> PAGE_SHIFT)) ||
+ kimage_is_destination_range(image, addr, addr + KEXEC_REBOOT_CODE_SIZE)) {
+ list_add(&pages->list, &extra_pages);
+ pages = 0;
+ }
+ } while(!pages);
+ if (pages) {
+ int result;
+ result = identity_map_pages(pages, order);
+ if (result < 0) {
+ list_add(&pages->list, &extra_pages);
+ pages = 0;
+ }
+ }
+ /* If I could convert a multi page allocation into a buch of
+ * single page allocations I could add these pages to
+ * image->dest_pages. For now it is simpler to just free the
+ * pages again.
+ */
+ list_for_each_safe(pos, next, &extra_pages) {
+ struct page *page;
+ int i;
+ page = list_entry(pos, struct page, list);
+ for(i = 0; i < count; i++) {
+ ClearPageReserved(pages +i);
+ }
+ list_del(&extra_pages);
+ __free_pages(page, order);
+ }
+ return pages;
+}
+
+static int kimage_add_entry(struct kimage *image, kimage_entry_t entry)
+{
+ if (image->offset != 0) {
+ image->entry++;
+ }
+ if (image->entry == image->last_entry) {
+ kimage_entry_t *ind_page;
+ struct page *page;
+ page = kimage_alloc_page(image, GFP_KERNEL, KIMAGE_NO_DEST);
+ if (!page) {
+ return -ENOMEM;
+ }
+ ind_page = page_address(page);
+ *image->entry = virt_to_phys(ind_page) | IND_INDIRECTION;
+ image->entry = ind_page;
+ image->last_entry =
+ ind_page + ((PAGE_SIZE/sizeof(kimage_entry_t)) - 1);
+ }
+ *image->entry = entry;
+ image->entry++;
+ image->offset = 0;
+ return 0;
+}
+
+static int kimage_set_destination(
+ struct kimage *image, unsigned long destination)
+{
+ int result;
+ destination &= PAGE_MASK;
+ result = kimage_add_entry(image, destination | IND_DESTINATION);
+ if (result == 0) {
+ image->destination = destination;
+ }
+ return result;
+}
+
+
+static int kimage_add_page(struct kimage *image, unsigned long page)
+{
+ int result;
+ page &= PAGE_MASK;
+ result = kimage_add_entry(image, page | IND_SOURCE);
+ if (result == 0) {
+ image->destination += PAGE_SIZE;
+ }
+ return result;
+}
+
+
+static void kimage_free_extra_pages(struct kimage *image)
+{
+ /* Walk through and free any extra destination pages I may have */
+ struct list_head *pos, *next;
+ list_for_each_safe(pos, next, &image->dest_pages) {
+ struct page *page;
+ page = list_entry(pos, struct page, list);
+ list_del(&page->list);
+ ClearPageReserved(page);
+ __free_page(page);
+ }
+ /* Walk through and free any unuseable pages I have cached */
+ list_for_each_safe(pos, next, &image->unuseable_pages) {
+ struct page *page;
+ page = list_entry(pos, struct page, list);
+ list_del(&page->list);
+ ClearPageReserved(page);
+ __free_page(page);
+ }
+
+}
+static int kimage_terminate(struct kimage *image)
+{
+ int result;
+ result = kimage_add_entry(image, IND_DONE);
+ if (result == 0) {
+ /* Point at the terminating element */
+ image->entry--;
+ kimage_free_extra_pages(image);
+ }
+ return result;
+}
+
+#define for_each_kimage_entry(image, ptr, entry) \
+ for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE); \
+ ptr = (entry & IND_INDIRECTION)? \
+ phys_to_virt((entry & PAGE_MASK)): ptr +1)
+
+static void kimage_free(struct kimage *image)
+{
+ kimage_entry_t *ptr, entry;
+ kimage_entry_t ind = 0;
+ int i, count, order;
+ if (!image)
+ return;
+ kimage_free_extra_pages(image);
+ for_each_kimage_entry(image, ptr, entry) {
+ if (entry & IND_INDIRECTION) {
+ /* Free the previous indirection page */
+ if (ind & IND_INDIRECTION) {
+ free_page((unsigned long)phys_to_virt(ind & PAGE_MASK));
+ }
+ /* Save this indirection page until we are
+ * done with it.
+ */
+ ind = entry;
+ }
+ else if (entry & IND_SOURCE) {
+ free_page((unsigned long)phys_to_virt(entry & PAGE_MASK));
+ }
+ }
+ order = get_order(KEXEC_REBOOT_CODE_SIZE);
+ count = 1 << order;
+ do_munmap(&init_mm,
+ page_to_pfn(image->reboot_code_pages) << PAGE_SHIFT,
+ count << PAGE_SHIFT);
+ for(i = 0; i < count; i++) {
+ ClearPageReserved(image->reboot_code_pages + i);
+ }
+ __free_pages(image->reboot_code_pages, order);
+ kfree(image);
+}
+
+static kimage_entry_t *kimage_dst_used(struct kimage *image, unsigned long page)
+{
+ kimage_entry_t *ptr, entry;
+ unsigned long destination = 0;
+ for_each_kimage_entry(image, ptr, entry) {
+ if (entry & IND_DESTINATION) {
+ destination = entry & PAGE_MASK;
+ }
+ else if (entry & IND_SOURCE) {
+ if (page == destination) {
+ return ptr;
+ }
+ destination += PAGE_SIZE;
+ }
+ }
+ return 0;
+}
+
+static struct page *kimage_alloc_page(struct kimage *image, unsigned int gfp_mask, unsigned long destination)
+{
+ /* Here we implment safe guards to ensure that a source page
+ * is not copied to it's destination page before the data on
+ * the destination page is no longer useful.
+ *
+ * To do this we maintain the invariant that a source page is
+ * either it's own destination page, or it is not a
+ * destination page at all.
+ *
+ * That is slightly stronger than required, but the proof
+ * that no problems will not occur is trivial, and the
+ * implemenation is simply to verify.
+ *
+ * When allocating all pages normally this algorithm will run
+ * in O(N) time, but in the worst case it will run in O(N^2)
+ * time. If the runtime is a problem the data structures can
+ * be fixed.
+ */
+ struct page *page;
+ unsigned long addr;
+
+ /* Walk through the list of destination pages, and see if I
+ * have a match.
+ */
+ list_for_each_entry(page, &image->dest_pages, list) {
+ addr = page_to_pfn(page) << PAGE_SHIFT;
+ if (addr == destination) {
+ list_del(&page->list);
+ return page;
+ }
+ }
+ page = 0;
+ while(1) {
+ kimage_entry_t *old;
+ /* Allocate a page, if we run out of memory give up */
+ page = alloc_page(gfp_mask);
+ if (!page) {
+ return 0;
+ }
+ SetPageReserved(page);
+ /* If the page cannot be used file it away */
+ if (page_to_pfn(page) > (KEXEC_SOURCE_MEMORY_LIMIT >> PAGE_SHIFT)) {
+ list_add(&page->list, &image->unuseable_pages);
+ continue;
+ }
+ addr = page_to_pfn(page) << PAGE_SHIFT;
+
+ /* If it is the destination page we want use it */
+ if (addr == destination)
+ break;
+
+ /* If the page is not a destination page use it */
+ if (!kimage_is_destination_range(image, addr, addr + PAGE_SIZE))
+ break;
+
+ /* I know that the page is someones destination page.
+ * See if there is already a source page for this
+ * destination page. And if so swap the source pages.
+ */
+ old = kimage_dst_used(image, addr);
+ if (old) {
+ /* If so move it */
+ unsigned long old_addr;
+ struct page *old_page;
+
+ old_addr = *old & PAGE_MASK;
+ old_page = pfn_to_page(old_addr >> PAGE_SHIFT);
+ copy_highpage(page, old_page);
+ *old = addr | (*old & ~PAGE_MASK);
+
+ /* The old page I have found cannot be a
+ * destination page, so return it.
+ */
+ addr = old_addr;
+ page = old_page;
+ break;
+ }
+ else {
+ /* Place the page on the destination list I
+ * will use it later.
+ */
+ list_add(&page->list, &image->dest_pages);
+ }
+ }
+ return page;
+}
+
+static int kimage_load_segment(struct kimage *image,
+ struct kexec_segment *segment)
+{
+ unsigned long mstart;
+ int result;
+ unsigned long offset;
+ unsigned long offset_end;
+ unsigned char *buf;
+
+ result = 0;
+ buf = segment->buf;
+ mstart = (unsigned long)segment->mem;
+
+ offset_end = segment->memsz;
+
+ result = kimage_set_destination(image, mstart);
+ if (result < 0) {
+ goto out;
+ }
+ for(offset = 0; offset < segment->memsz; offset += PAGE_SIZE) {
+ struct page *page;
+ char *ptr;
+ size_t size, leader;
+ page = kimage_alloc_page(image, GFP_HIGHUSER, mstart + offset);
+ if (page == 0) {
+ result = -ENOMEM;
+ goto out;
+ }
+ result = kimage_add_page(image, page_to_pfn(page) << PAGE_SHIFT);
+ if (result < 0) {
+ goto out;
+ }
+ ptr = kmap(page);
+ if (segment->bufsz < offset) {
+ /* We are past the end zero the whole page */
+ memset(ptr, 0, PAGE_SIZE);
+ kunmap(page);
+ continue;
+ }
+ size = PAGE_SIZE;
+ leader = 0;
+ if ((offset == 0)) {
+ leader = mstart & ~PAGE_MASK;
+ }
+ if (leader) {
+ /* We are on the first page zero the unused portion */
+ memset(ptr, 0, leader);
+ size -= leader;
+ ptr += leader;
+ }
+ if (size > (segment->bufsz - offset)) {
+ size = segment->bufsz - offset;
+ }
+ if (size < (PAGE_SIZE - leader)) {
+ /* zero the trailing part of the page */
+ memset(ptr + size, 0, (PAGE_SIZE - leader) - size);
+ }
+ result = copy_from_user(ptr, buf + offset, size);
+ kunmap(page);
+ if (result) {
+ result = (result < 0)?result : -EIO;
+ goto out;
+ }
+ }
+ out:
+ return result;
+}
+
+/*
+ * Exec Kernel system call: for obvious reasons only root may call it.
+ *
+ * This call breaks up into three pieces.
+ * - A generic part which loads the new kernel from the current
+ * address space, and very carefully places the data in the
+ * allocated pages.
+ *
+ * - A generic part that interacts with the kernel and tells all of
+ * the devices to shut down. Preventing on-going dmas, and placing
+ * the devices in a consistent state so a later kernel can
+ * reinitialize them.
+ *
+ * - A machine specific part that includes the syscall number
+ * and the copies the image to it's final destination. And
+ * jumps into the image at entry.
+ *
+ * kexec does not sync, or unmount filesystems so if you need
+ * that to happen you need to do that yourself.
+ */
+struct kimage *kexec_image = 0;
+
+asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
+ struct kexec_segment *segments, unsigned long flags)
+{
+ struct kimage *image;
+ int result;
+
+ /* We only trust the superuser with rebooting the system. */
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ /* In case we need just a little bit of special behavior for
+ * reboot on panic
+ */
+ if (flags != 0)
+ return -EINVAL;
+
+ if (nr_segments > KEXEC_SEGMENT_MAX)
+ return -EINVAL;
+
+ image = 0;
+ result = 0;
+
+ if (nr_segments > 0) {
+ unsigned long i;
+ result = kimage_alloc(&image, nr_segments, segments);
+ if (result) {
+ goto out;
+ }
+ image->start = entry;
+ for (i = 0; i < nr_segments; i++) {
+ ///result = kimage_load_segment(image, &segments[i]);
+ result = kimage_load_segment(image, &image->segment[i]);
+ if (result) {
+ goto out;
+ }
+ }
+ result = kimage_terminate(image);
+ if (result) {
+ goto out;
+ }
+ }
+
+ image = xchg(&kexec_image, image);
+
+ out:
+ kimage_free(image);
+ return result;
+}
diff -purN -X /home/mbligh/.diff.exclude reference/kernel/sys.c current/kernel/sys.c
--- reference/kernel/sys.c Wed Jun 16 08:19:27 2004
+++ current/kernel/sys.c Thu Jun 17 12:58:19 2004
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/fs.h>
+#include <linux/kexec.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/times.h>
@@ -224,6 +225,7 @@ cond_syscall(sys_acct)
cond_syscall(sys_lookup_dcookie)
cond_syscall(sys_swapon)
cond_syscall(sys_swapoff)
+cond_syscall(sys_kexec_load)
cond_syscall(sys_init_module)
cond_syscall(sys_delete_module)
cond_syscall(sys_socketpair)
@@ -503,6 +505,27 @@ asmlinkage long sys_reboot(int magic1, i
machine_restart(buffer);
break;
+#ifdef CONFIG_KEXEC
+ case LINUX_REBOOT_CMD_KEXEC:
+ {
+ struct kimage *image;
+ if (arg) {
+ unlock_kernel();
+ return -EINVAL;
+ }
+ image = xchg(&kexec_image, 0);
+ if (!image) {
+ unlock_kernel();
+ return -EINVAL;
+ }
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+ system_state = SYSTEM_RESTART;
+ device_shutdown();
+ printk(KERN_EMERG "Starting new kernel\n");
+ machine_kexec(image);
+ break;
+ }
+#endif
#ifdef CONFIG_SOFTWARE_SUSPEND
case LINUX_REBOOT_CMD_SW_SUSPEND:
{