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x86-64, reboot: Allow reboot=bios and reboot-cpu override on x86-64

Forráskód böngészése 
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
2012-06-16 21:47:37 -07:00
szülő cfaf025112
commit 650513979a
7 fájl változott, egészen pontosan 55 új sor hozzáadva és 38 régi sor törölve
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52
arch/x86/kernel/reboot.c
Fájl megtekintése

@@ -20,14 +20,12 @@
#include <asm/virtext.h>
#include <asm/cpu.h>
#include <asm/nmi.h>
#include <asm/smp.h>
#ifdef CONFIG_X86_32
# include <linux/ctype.h>
# include <linux/mc146818rtc.h>
# include <asm/realmode.h>
#else
# include <asm/x86_init.h>
#endif
#include <linux/ctype.h>
#include <linux/mc146818rtc.h>
#include <asm/realmode.h>
#include <asm/x86_init.h>
/*
* Power off function, if any
@@ -49,7 +47,7 @@ int reboot_force;
*/
static int reboot_default = 1;
#if defined(CONFIG_X86_32) && defined(CONFIG_SMP)
#ifdef CONFIG_SMP
static int reboot_cpu = -1;
#endif
@@ -67,8 +65,8 @@ bool port_cf9_safe = false;
* reboot=b[ios] | s[mp] | t[riple] | k[bd] | e[fi] [, [w]arm | [c]old] | p[ci]
* warm Don't set the cold reboot flag
* cold Set the cold reboot flag
* bios Reboot by jumping through the BIOS (only for X86_32)
* smp Reboot by executing reset on BSP or other CPU (only for X86_32)
* bios Reboot by jumping through the BIOS
* smp Reboot by executing reset on BSP or other CPU
* triple Force a triple fault (init)
* kbd Use the keyboard controller. cold reset (default)
* acpi Use the RESET_REG in the FADT
@@ -95,7 +93,6 @@ static int __init reboot_setup(char *str)
reboot_mode = 0;
break;
#ifdef CONFIG_X86_32
#ifdef CONFIG_SMP
case 's':
if (isdigit(*(str+1))) {
@@ -112,7 +109,6 @@ static int __init reboot_setup(char *str)
#endif /* CONFIG_SMP */
case 'b':
#endif
case 'a':
case 'k':
case 't':
@@ -138,7 +134,6 @@ static int __init reboot_setup(char *str)
__setup("reboot=", reboot_setup);
#ifdef CONFIG_X86_32
/*
* Reboot options and system auto-detection code provided by
* Dell Inc. so their systems "just work". :-)
@@ -157,11 +152,8 @@ static int __init set_bios_reboot(const struct dmi_system_id *d)
return 0;
}
void machine_real_restart(unsigned int type)
void __noreturn machine_real_restart(unsigned int type)
{
void (*restart_lowmem)(unsigned int) = (void (*)(unsigned int))
real_mode_header->machine_real_restart_asm;
local_irq_disable();
/*
@@ -181,7 +173,11 @@ void machine_real_restart(unsigned int type)
/*
* Switch back to the initial page table.
*/
#ifdef CONFIG_X86_32
load_cr3(initial_page_table);
#else
write_cr3(real_mode_header->trampoline_pgd);
#endif
/*
* Write 0x1234 to absolute memory location 0x472. The BIOS reads
@@ -192,14 +188,21 @@ void machine_real_restart(unsigned int type)
*((unsigned short *)0x472) = reboot_mode;
/* Jump to the identity-mapped low memory code */
restart_lowmem(type);
#ifdef CONFIG_X86_32
asm volatile("jmpl *%0" : :
"rm" (real_mode_header->machine_real_restart_asm),
"a" (type));
#else
asm volatile("ljmpl *%0" : :
"m" (real_mode_header->machine_real_restart_asm),
"D" (type));
#endif
unreachable();
}
#ifdef CONFIG_APM_MODULE
EXPORT_SYMBOL(machine_real_restart);
#endif
#endif /* CONFIG_X86_32 */
/*
* Some Apple MacBook and MacBookPro's needs reboot=p to be able to reboot
*/
@@ -223,11 +226,9 @@ static int __init set_kbd_reboot(const struct dmi_system_id *d)
}
/*
* This is a single dmi_table handling all reboot quirks. Note that
* REBOOT_BIOS is only available for 32bit
* This is a single dmi_table handling all reboot quirks.
*/
static struct dmi_system_id __initdata reboot_dmi_table[] = {
#ifdef CONFIG_X86_32
{ /* Handle problems with rebooting on Dell E520's */
.callback = set_bios_reboot,
.ident = "Dell E520",
@@ -377,7 +378,6 @@ static struct dmi_system_id __initdata reboot_dmi_table[] = {
DMI_MATCH(DMI_BOARD_NAME, "P4S800"),
},
},
#endif /* CONFIG_X86_32 */
{ /* Handle reboot issue on Acer Aspire one */
.callback = set_kbd_reboot,
@@ -576,13 +576,11 @@ static void native_machine_emergency_restart(void)
reboot_type = BOOT_KBD;
break;
#ifdef CONFIG_X86_32
case BOOT_BIOS:
machine_real_restart(MRR_BIOS);
reboot_type = BOOT_KBD;
break;
#endif
case BOOT_ACPI:
acpi_reboot();
@@ -624,12 +622,10 @@ void native_machine_shutdown(void)
/* The boot cpu is always logical cpu 0 */
int reboot_cpu_id = 0;
#ifdef CONFIG_X86_32
/* See if there has been given a command line override */
if ((reboot_cpu != -1) && (reboot_cpu < nr_cpu_ids) &&
cpu_online(reboot_cpu))
reboot_cpu_id = reboot_cpu;
#endif
/* Make certain the cpu I'm about to reboot on is online */
if (!cpu_online(reboot_cpu_id))