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x86-64, reboot: Allow reboot=bios and reboot-cpu override on x86-64
With the revamped realmode trampoline code, it is trivial to extend support for reboot=bios to x86-64. Furthermore, while we are at it, remove the restriction that only we can only override the reboot CPU on 32 bits. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Link: http://lkml.kernel.org/n/tip-jopx7y6g6dbcx4tpal8q0jlr@git.kernel.org
This commit is contained in:
H. Peter Anvin
parent
cfaf025112
commit
650513979a
@ -4,9 +4,7 @@
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enum reboot_type {
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BOOT_TRIPLE = 't',
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BOOT_KBD = 'k',
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#ifdef CONFIG_X86_32
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BOOT_BIOS = 'b',
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#endif
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BOOT_ACPI = 'a',
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BOOT_EFI = 'e',
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BOOT_CF9 = 'p',
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@ -21,8 +21,9 @@ struct real_mode_header {
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u32 wakeup_header;
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#endif
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/* APM/BIOS reboot */
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#ifdef CONFIG_X86_32
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u32 machine_real_restart_asm;
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#ifdef CONFIG_X86_64
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u32 machine_real_restart_seg;
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#endif
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};
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@ -18,8 +18,8 @@ extern struct machine_ops machine_ops;
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void native_machine_crash_shutdown(struct pt_regs *regs);
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void native_machine_shutdown(void);
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void machine_real_restart(unsigned int type);
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/* These must match dispatch_table in reboot_32.S */
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void __noreturn machine_real_restart(unsigned int type);
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/* These must match dispatch in arch/x86/realmore/rm/reboot.S */
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#define MRR_BIOS 0
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#define MRR_APM 1
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@ -20,14 +20,12 @@
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#include <asm/virtext.h>
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#include <asm/cpu.h>
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#include <asm/nmi.h>
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#include <asm/smp.h>
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#ifdef CONFIG_X86_32
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# include <linux/ctype.h>
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# include <linux/mc146818rtc.h>
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# include <asm/realmode.h>
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#else
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# include <asm/x86_init.h>
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#endif
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#include <linux/ctype.h>
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#include <linux/mc146818rtc.h>
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#include <asm/realmode.h>
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#include <asm/x86_init.h>
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/*
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* Power off function, if any
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@ -49,7 +47,7 @@ int reboot_force;
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*/
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static int reboot_default = 1;
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#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
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#ifdef CONFIG_SMP
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static int reboot_cpu = -1;
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#endif
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@ -67,8 +65,8 @@ bool port_cf9_safe = false;
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* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
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* warm Don't set the cold reboot flag
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* cold Set the cold reboot flag
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* bios Reboot by jumping through the BIOS (only for X86_32)
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* smp Reboot by executing reset on BSP or other CPU (only for X86_32)
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* bios Reboot by jumping through the BIOS
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* smp Reboot by executing reset on BSP or other CPU
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* triple Force a triple fault (init)
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* kbd Use the keyboard controller. cold reset (default)
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* acpi Use the RESET_REG in the FADT
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@ -95,7 +93,6 @@ static int __init reboot_setup(char *str)
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reboot_mode = 0;
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break;
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_SMP
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case 's':
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if (isdigit(*(str+1))) {
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@ -112,7 +109,6 @@ static int __init reboot_setup(char *str)
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#endif /* CONFIG_SMP */
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case 'b':
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#endif
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case 'a':
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case 'k':
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case 't':
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@ -138,7 +134,6 @@ static int __init reboot_setup(char *str)
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__setup("reboot=", reboot_setup);
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#ifdef CONFIG_X86_32
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/*
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* Reboot options and system auto-detection code provided by
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* Dell Inc. so their systems "just work". :-)
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@ -157,11 +152,8 @@ static int __init set_bios_reboot(const struct dmi_system_id *d)
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return 0;
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}
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void machine_real_restart(unsigned int type)
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void __noreturn machine_real_restart(unsigned int type)
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{
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void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
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real_mode_header->machine_real_restart_asm;
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local_irq_disable();
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/*
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@ -181,7 +173,11 @@ void machine_real_restart(unsigned int type)
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/*
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* Switch back to the initial page table.
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*/
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#ifdef CONFIG_X86_32
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load_cr3(initial_page_table);
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#else
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write_cr3(real_mode_header->trampoline_pgd);
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#endif
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/*
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* Write 0x1234 to absolute memory location 0x472. The BIOS reads
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@ -192,14 +188,21 @@ void machine_real_restart(unsigned int type)
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*((unsigned short *)0x472) = reboot_mode;
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/* Jump to the identity-mapped low memory code */
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restart_lowmem(type);
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#ifdef CONFIG_X86_32
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asm volatile("jmpl *%0" : :
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"rm" (real_mode_header->machine_real_restart_asm),
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"a" (type));
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#else
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asm volatile("ljmpl *%0" : :
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"m" (real_mode_header->machine_real_restart_asm),
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"D" (type));
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#endif
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unreachable();
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}
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#ifdef CONFIG_APM_MODULE
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EXPORT_SYMBOL(machine_real_restart);
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#endif
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#endif /* CONFIG_X86_32 */
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/*
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* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
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*/
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@ -223,11 +226,9 @@ static int __init set_kbd_reboot(const struct dmi_system_id *d)
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}
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/*
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* This is a single dmi_table handling all reboot quirks. Note that
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* REBOOT_BIOS is only available for 32bit
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* This is a single dmi_table handling all reboot quirks.
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*/
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static struct dmi_system_id __initdata reboot_dmi_table[] = {
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#ifdef CONFIG_X86_32
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{ /* Handle problems with rebooting on Dell E520's */
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.callback = set_bios_reboot,
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.ident = "Dell E520",
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@ -377,7 +378,6 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
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DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
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},
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},
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#endif /* CONFIG_X86_32 */
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{ /* Handle reboot issue on Acer Aspire one */
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.callback = set_kbd_reboot,
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@ -576,13 +576,11 @@ static void native_machine_emergency_restart(void)
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reboot_type = BOOT_KBD;
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break;
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#ifdef CONFIG_X86_32
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case BOOT_BIOS:
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machine_real_restart(MRR_BIOS);
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reboot_type = BOOT_KBD;
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break;
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#endif
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case BOOT_ACPI:
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acpi_reboot();
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@ -624,12 +622,10 @@ void native_machine_shutdown(void)
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/* The boot cpu is always logical cpu 0 */
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int reboot_cpu_id = 0;
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#ifdef CONFIG_X86_32
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/* See if there has been given a command line override */
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if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
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cpu_online(reboot_cpu))
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reboot_cpu_id = reboot_cpu;
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#endif
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/* Make certain the cpu I'm about to reboot on is online */
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if (!cpu_online(reboot_cpu_id))
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@ -22,7 +22,7 @@ wakeup-objs += video-bios.o
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realmode-y += header.o
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realmode-y += trampoline_$(BITS).o
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realmode-y += stack.o
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realmode-$(CONFIG_X86_32) += reboot_32.o
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realmode-y += reboot.o
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realmode-$(CONFIG_ACPI_SLEEP) += $(wakeup-objs)
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targets += $(realmode-y)
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@ -6,6 +6,7 @@
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#include <linux/linkage.h>
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#include <asm/page_types.h>
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#include <asm/segment.h>
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#include "realmode.h"
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@ -28,8 +29,9 @@ GLOBAL(real_mode_header)
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.long pa_wakeup_header
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#endif
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/* APM/BIOS reboot */
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#ifdef CONFIG_X86_32
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.long pa_machine_real_restart_asm
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#ifdef CONFIG_X86_64
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.long __KERNEL32_CS
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#endif
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END(real_mode_header)
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@ -2,6 +2,8 @@
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#include <linux/init.h>
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#include <asm/segment.h>
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#include <asm/page_types.h>
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#include <asm/processor-flags.h>
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#include <asm/msr-index.h>
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#include "realmode.h"
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/*
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@ -12,13 +14,31 @@
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* doesn't work with at least one type of 486 motherboard. It is easy
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* to stop this code working; hence the copious comments.
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*
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* This code is called with the restart type (0 = BIOS, 1 = APM) in %eax.
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* This code is called with the restart type (0 = BIOS, 1 = APM) in
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* the primary argument register (%eax for 32 bit, %edi for 64 bit).
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*/
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.section ".text32", "ax"
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.code32
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.balign 16
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ENTRY(machine_real_restart_asm)
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#ifdef CONFIG_X86_64
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/* Disable paging to drop us out of long mode */
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movl %cr0, %eax
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andl $~X86_CR0_PG, %eax
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movl %eax, %cr0
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jmp 1f /* "A branch" may be needed here, assume near is OK */
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1:
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xorl %eax, %eax
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xorl %edx, %edx
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movl $MSR_EFER, %ecx
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wrmsr
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movl %edi, %eax
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#endif /* CONFIG_X86_64 */
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/* Set up the IDT for real mode. */
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lidtl pa_machine_real_restart_idt
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