| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/delay.h> |
| #include <linux/init.h> |
| #include <linux/interrupt.h> |
| #include <linux/mc146818rtc.h> |
| #include <linux/efi.h> |
| #include <linux/dmi.h> |
| #include <linux/ctype.h> |
| #include <linux/pm.h> |
| #include <linux/reboot.h> |
| #include <asm/uaccess.h> |
| #include <asm/apic.h> |
| #include <asm/hpet.h> |
| #include <asm/desc.h> |
| #include "mach_reboot.h" |
| #include <asm/reboot_fixups.h> |
| #include <asm/reboot.h> |
| |
| /* |
| * Power off function, if any |
| */ |
| void (*pm_power_off)(void); |
| EXPORT_SYMBOL(pm_power_off); |
| |
| static int reboot_mode; |
| static int reboot_thru_bios; |
| |
| #ifdef CONFIG_SMP |
| static int reboot_cpu = -1; |
| #endif |
| static int __init reboot_setup(char *str) |
| { |
| while(1) { |
| switch (*str) { |
| case 'w': /* "warm" reboot (no memory testing etc) */ |
| reboot_mode = 0x1234; |
| break; |
| case 'c': /* "cold" reboot (with memory testing etc) */ |
| reboot_mode = 0x0; |
| break; |
| case 'b': /* "bios" reboot by jumping through the BIOS */ |
| reboot_thru_bios = 1; |
| break; |
| case 'h': /* "hard" reboot by toggling RESET and/or crashing the CPU */ |
| reboot_thru_bios = 0; |
| break; |
| #ifdef CONFIG_SMP |
| case 's': /* "smp" reboot by executing reset on BSP or other CPU*/ |
| if (isdigit(*(str+1))) { |
| reboot_cpu = (int) (*(str+1) - '0'); |
| if (isdigit(*(str+2))) |
| reboot_cpu = reboot_cpu*10 + (int)(*(str+2) - '0'); |
| } |
| /* we will leave sorting out the final value |
| when we are ready to reboot, since we might not |
| have set up boot_cpu_id or smp_num_cpu */ |
| break; |
| #endif |
| } |
| if((str = strchr(str,',')) != NULL) |
| str++; |
| else |
| break; |
| } |
| return 1; |
| } |
| |
| __setup("reboot=", reboot_setup); |
| |
| /* |
| * Reboot options and system auto-detection code provided by |
| * Dell Inc. so their systems "just work". :-) |
| */ |
| |
| /* |
| * Some machines require the "reboot=b" commandline option, this quirk makes that automatic. |
| */ |
| static int __init set_bios_reboot(const struct dmi_system_id *d) |
| { |
| if (!reboot_thru_bios) { |
| reboot_thru_bios = 1; |
| printk(KERN_INFO "%s series board detected. Selecting BIOS-method for reboots.\n", d->ident); |
| } |
| return 0; |
| } |
| |
| static struct dmi_system_id __initdata reboot_dmi_table[] = { |
| { /* Handle problems with rebooting on Dell E520's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell E520", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "Dell DM061"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell 1300's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell PowerEdge 1300", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 1300/"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell 300's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell PowerEdge 300", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 300/"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell Optiplex 745's SFF*/ |
| .callback = set_bios_reboot, |
| .ident = "Dell OptiPlex 745", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
| DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 745"), |
| DMI_MATCH(DMI_BOARD_NAME, "0WF810"), |
| }, |
| }, |
| { /* Handle problems with rebooting on Dell 2400's */ |
| .callback = set_bios_reboot, |
| .ident = "Dell PowerEdge 2400", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "PowerEdge 2400"), |
| }, |
| }, |
| { /* Handle problems with rebooting on HP laptops */ |
| .callback = set_bios_reboot, |
| .ident = "HP Compaq Laptop", |
| .matches = { |
| DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"), |
| DMI_MATCH(DMI_PRODUCT_NAME, "HP Compaq"), |
| }, |
| }, |
| { } |
| }; |
| |
| static int __init reboot_init(void) |
| { |
| dmi_check_system(reboot_dmi_table); |
| return 0; |
| } |
| |
| core_initcall(reboot_init); |
| |
| /* The following code and data reboots the machine by switching to real |
| mode and jumping to the BIOS reset entry point, as if the CPU has |
| really been reset. The previous version asked the keyboard |
| controller to pulse the CPU reset line, which is more thorough, but |
| doesn't work with at least one type of 486 motherboard. It is easy |
| to stop this code working; hence the copious comments. */ |
| |
| static unsigned long long |
| real_mode_gdt_entries [3] = |
| { |
| 0x0000000000000000ULL, /* Null descriptor */ |
| 0x00009a000000ffffULL, /* 16-bit real-mode 64k code at 0x00000000 */ |
| 0x000092000100ffffULL /* 16-bit real-mode 64k data at 0x00000100 */ |
| }; |
| |
| static struct Xgt_desc_struct |
| real_mode_gdt = { sizeof (real_mode_gdt_entries) - 1, (long)real_mode_gdt_entries }, |
| real_mode_idt = { 0x3ff, 0 }, |
| no_idt = { 0, 0 }; |
| |
| |
| /* This is 16-bit protected mode code to disable paging and the cache, |
| switch to real mode and jump to the BIOS reset code. |
| |
| The instruction that switches to real mode by writing to CR0 must be |
| followed immediately by a far jump instruction, which set CS to a |
| valid value for real mode, and flushes the prefetch queue to avoid |
| running instructions that have already been decoded in protected |
| mode. |
| |
| Clears all the flags except ET, especially PG (paging), PE |
| (protected-mode enable) and TS (task switch for coprocessor state |
| save). Flushes the TLB after paging has been disabled. Sets CD and |
| NW, to disable the cache on a 486, and invalidates the cache. This |
| is more like the state of a 486 after reset. I don't know if |
| something else should be done for other chips. |
| |
| More could be done here to set up the registers as if a CPU reset had |
| occurred; hopefully real BIOSs don't assume much. */ |
| |
| static unsigned char real_mode_switch [] = |
| { |
| 0x66, 0x0f, 0x20, 0xc0, /* movl %cr0,%eax */ |
| 0x66, 0x83, 0xe0, 0x11, /* andl $0x00000011,%eax */ |
| 0x66, 0x0d, 0x00, 0x00, 0x00, 0x60, /* orl $0x60000000,%eax */ |
| 0x66, 0x0f, 0x22, 0xc0, /* movl %eax,%cr0 */ |
| 0x66, 0x0f, 0x22, 0xd8, /* movl %eax,%cr3 */ |
| 0x66, 0x0f, 0x20, 0xc3, /* movl %cr0,%ebx */ |
| 0x66, 0x81, 0xe3, 0x00, 0x00, 0x00, 0x60, /* andl $0x60000000,%ebx */ |
| 0x74, 0x02, /* jz f */ |
| 0x0f, 0x09, /* wbinvd */ |
| 0x24, 0x10, /* f: andb $0x10,al */ |
| 0x66, 0x0f, 0x22, 0xc0 /* movl %eax,%cr0 */ |
| }; |
| static unsigned char jump_to_bios [] = |
| { |
| 0xea, 0x00, 0x00, 0xff, 0xff /* ljmp $0xffff,$0x0000 */ |
| }; |
| |
| /* |
| * Switch to real mode and then execute the code |
| * specified by the code and length parameters. |
| * We assume that length will aways be less that 100! |
| */ |
| void machine_real_restart(unsigned char *code, int length) |
| { |
| local_irq_disable(); |
| |
| /* Write zero to CMOS register number 0x0f, which the BIOS POST |
| routine will recognize as telling it to do a proper reboot. (Well |
| that's what this book in front of me says -- it may only apply to |
| the Phoenix BIOS though, it's not clear). At the same time, |
| disable NMIs by setting the top bit in the CMOS address register, |
| as we're about to do peculiar things to the CPU. I'm not sure if |
| `outb_p' is needed instead of just `outb'. Use it to be on the |
| safe side. (Yes, CMOS_WRITE does outb_p's. - Paul G.) |
| */ |
| |
| spin_lock(&rtc_lock); |
| CMOS_WRITE(0x00, 0x8f); |
| spin_unlock(&rtc_lock); |
| |
| /* Remap the kernel at virtual address zero, as well as offset zero |
| from the kernel segment. This assumes the kernel segment starts at |
| virtual address PAGE_OFFSET. */ |
| |
| memcpy (swapper_pg_dir, swapper_pg_dir + USER_PGD_PTRS, |
| sizeof (swapper_pg_dir [0]) * KERNEL_PGD_PTRS); |
| |
| /* |
| * Use `swapper_pg_dir' as our page directory. |
| */ |
| load_cr3(swapper_pg_dir); |
| |
| /* Write 0x1234 to absolute memory location 0x472. The BIOS reads |
| this on booting to tell it to "Bypass memory test (also warm |
| boot)". This seems like a fairly standard thing that gets set by |
| REBOOT.COM programs, and the previous reset routine did this |
| too. */ |
| |
| *((unsigned short *)0x472) = reboot_mode; |
| |
| /* For the switch to real mode, copy some code to low memory. It has |
| to be in the first 64k because it is running in 16-bit mode, and it |
| has to have the same physical and virtual address, because it turns |
| off paging. Copy it near the end of the first page, out of the way |
| of BIOS variables. */ |
| |
| memcpy ((void *) (0x1000 - sizeof (real_mode_switch) - 100), |
| real_mode_switch, sizeof (real_mode_switch)); |
| memcpy ((void *) (0x1000 - 100), code, length); |
| |
| /* Set up the IDT for real mode. */ |
| |
| load_idt(&real_mode_idt); |
| |
| /* Set up a GDT from which we can load segment descriptors for real |
| mode. The GDT is not used in real mode; it is just needed here to |
| prepare the descriptors. */ |
| |
| load_gdt(&real_mode_gdt); |
| |
| /* Load the data segment registers, and thus the descriptors ready for |
| real mode. The base address of each segment is 0x100, 16 times the |
| selector value being loaded here. This is so that the segment |
| registers don't have to be reloaded after switching to real mode: |
| the values are consistent for real mode operation already. */ |
| |
| __asm__ __volatile__ ("movl $0x0010,%%eax\n" |
| "\tmovl %%eax,%%ds\n" |
| "\tmovl %%eax,%%es\n" |
| "\tmovl %%eax,%%fs\n" |
| "\tmovl %%eax,%%gs\n" |
| "\tmovl %%eax,%%ss" : : : "eax"); |
| |
| /* Jump to the 16-bit code that we copied earlier. It disables paging |
| and the cache, switches to real mode, and jumps to the BIOS reset |
| entry point. */ |
| |
| __asm__ __volatile__ ("ljmp $0x0008,%0" |
| : |
| : "i" ((void *) (0x1000 - sizeof (real_mode_switch) - 100))); |
| } |
| #ifdef CONFIG_APM_MODULE |
| EXPORT_SYMBOL(machine_real_restart); |
| #endif |
| |
| static void native_machine_shutdown(void) |
| { |
| #ifdef CONFIG_SMP |
| int reboot_cpu_id; |
| |
| /* The boot cpu is always logical cpu 0 */ |
| reboot_cpu_id = 0; |
| |
| /* See if there has been given a command line override */ |
| if ((reboot_cpu != -1) && (reboot_cpu < NR_CPUS) && |
| cpu_isset(reboot_cpu, cpu_online_map)) { |
| reboot_cpu_id = reboot_cpu; |
| } |
| |
| /* Make certain the cpu I'm rebooting on is online */ |
| if (!cpu_isset(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, cpumask_of_cpu(reboot_cpu_id)); |
| |
| /* O.K. Now that I'm on the appropriate processor, stop |
| * all of the others, and disable their local APICs. |
| */ |
| |
| smp_send_stop(); |
| #endif /* CONFIG_SMP */ |
| |
| lapic_shutdown(); |
| |
| #ifdef CONFIG_X86_IO_APIC |
| disable_IO_APIC(); |
| #endif |
| #ifdef CONFIG_HPET_TIMER |
| hpet_disable(); |
| #endif |
| } |
| |
| void __attribute__((weak)) mach_reboot_fixups(void) |
| { |
| } |
| |
| static void native_machine_emergency_restart(void) |
| { |
| if (!reboot_thru_bios) { |
| if (efi_enabled) { |
| efi.reset_system(EFI_RESET_COLD, EFI_SUCCESS, 0, NULL); |
| load_idt(&no_idt); |
| __asm__ __volatile__("int3"); |
| } |
| /* rebooting needs to touch the page at absolute addr 0 */ |
| *((unsigned short *)__va(0x472)) = reboot_mode; |
| for (;;) { |
| mach_reboot_fixups(); /* for board specific fixups */ |
| mach_reboot(); |
| /* That didn't work - force a triple fault.. */ |
| load_idt(&no_idt); |
| __asm__ __volatile__("int3"); |
| } |
| } |
| if (efi_enabled) |
| efi.reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL); |
| |
| machine_real_restart(jump_to_bios, sizeof(jump_to_bios)); |
| } |
| |
| static void native_machine_restart(char * __unused) |
| { |
| machine_shutdown(); |
| machine_emergency_restart(); |
| } |
| |
| static void native_machine_halt(void) |
| { |
| } |
| |
| static void native_machine_power_off(void) |
| { |
| if (pm_power_off) { |
| machine_shutdown(); |
| pm_power_off(); |
| } |
| } |
| |
| |
| struct machine_ops machine_ops = { |
| .power_off = native_machine_power_off, |
| .shutdown = native_machine_shutdown, |
| .emergency_restart = native_machine_emergency_restart, |
| .restart = native_machine_restart, |
| .halt = native_machine_halt, |
| }; |
| |
| void machine_power_off(void) |
| { |
| machine_ops.power_off(); |
| } |
| |
| void machine_shutdown(void) |
| { |
| machine_ops.shutdown(); |
| } |
| |
| void machine_emergency_restart(void) |
| { |
| machine_ops.emergency_restart(); |
| } |
| |
| void machine_restart(char *cmd) |
| { |
| machine_ops.restart(cmd); |
| } |
| |
| void machine_halt(void) |
| { |
| machine_ops.halt(); |
| } |