diff options
Diffstat (limited to 'arch/x86/kernel/apm_32.c')
| -rw-r--r-- | arch/x86/kernel/apm_32.c | 50 |
1 files changed, 11 insertions, 39 deletions
diff --git a/arch/x86/kernel/apm_32.c b/arch/x86/kernel/apm_32.c index 660270359d39..b37ab1095707 100644 --- a/arch/x86/kernel/apm_32.c +++ b/arch/x86/kernel/apm_32.c @@ -94,7 +94,7 @@ * Remove APM dependencies in arch/i386/kernel/process.c * Remove APM dependencies in drivers/char/sysrq.c * Reset time across standby. - * Allow more inititialisation on SMP. + * Allow more initialisation on SMP. * Remove CONFIG_APM_POWER_OFF and make it boot time * configurable (default on). * Make debug only a boot time parameter (remove APM_DEBUG). @@ -232,18 +232,13 @@ #include <asm/paravirt.h> #include <asm/reboot.h> #include <asm/nospec-branch.h> +#include <asm/ibt.h> #if defined(CONFIG_APM_DISPLAY_BLANK) && defined(CONFIG_VT) extern int (*console_blank_hook)(int); #endif /* - * The apm_bios device is one of the misc char devices. - * This is its minor number. - */ -#define APM_MINOR_DEV 134 - -/* * Various options can be changed at boot time as follows: * (We allow underscores for compatibility with the modules code) * apm=on/off enable/disable APM @@ -425,7 +420,7 @@ static DEFINE_MUTEX(apm_mutex); * This is for buggy BIOS's that refer to (real mode) segment 0x40 * even though they are called in protected mode. */ -static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(0x4092, +static struct desc_struct bad_bios_desc = GDT_ENTRY_INIT(DESC_DATA32_BIOS, (unsigned long)__va(0x400UL), PAGE_SIZE - 0x400 - 1); static const char driver_version[] = "1.16ac"; /* no spaces */ @@ -598,6 +593,7 @@ static long __apm_bios_call(void *_call) struct desc_struct save_desc_40; struct desc_struct *gdt; struct apm_bios_call *call = _call; + u64 ibt; cpu = get_cpu(); BUG_ON(cpu != 0); @@ -607,11 +603,13 @@ static long __apm_bios_call(void *_call) apm_irq_save(flags); firmware_restrict_branch_speculation_start(); + ibt = ibt_save(true); APM_DO_SAVE_SEGS; apm_bios_call_asm(call->func, call->ebx, call->ecx, &call->eax, &call->ebx, &call->ecx, &call->edx, &call->esi); APM_DO_RESTORE_SEGS; + ibt_restore(ibt); firmware_restrict_branch_speculation_end(); apm_irq_restore(flags); gdt[0x40 / 8] = save_desc_40; @@ -676,6 +674,7 @@ static long __apm_bios_call_simple(void *_call) struct desc_struct save_desc_40; struct desc_struct *gdt; struct apm_bios_call *call = _call; + u64 ibt; cpu = get_cpu(); BUG_ON(cpu != 0); @@ -685,10 +684,12 @@ static long __apm_bios_call_simple(void *_call) apm_irq_save(flags); firmware_restrict_branch_speculation_start(); + ibt = ibt_save(true); APM_DO_SAVE_SEGS; error = apm_bios_call_simple_asm(call->func, call->ebx, call->ecx, &call->eax); APM_DO_RESTORE_SEGS; + ibt_restore(ibt); firmware_restrict_branch_speculation_end(); apm_irq_restore(flags); gdt[0x40 / 8] = save_desc_40; @@ -766,7 +767,7 @@ static int apm_driver_version(u_short *val) * not cleared until it is acknowledged. * * Additional information is returned in the info pointer, providing - * that APM 1.2 is in use. If no messges are pending the value 0x80 + * that APM 1.2 is in use. If no messages are pending the value 0x80 * is returned (No power management events pending). */ static int apm_get_event(apm_event_t *event, apm_eventinfo_t *info) @@ -1025,7 +1026,7 @@ static int apm_enable_power_management(int enable) * status which gives the rough battery status, and current power * source. The bat value returned give an estimate as a percentage * of life and a status value for the battery. The estimated life - * if reported is a lifetime in secodnds/minutes at current powwer + * if reported is a lifetime in seconds/minutes at current power * consumption. */ @@ -1054,35 +1055,6 @@ static int apm_get_power_status(u_short *status, u_short *bat, u_short *life) return APM_SUCCESS; } -#if 0 -static int apm_get_battery_status(u_short which, u_short *status, - u_short *bat, u_short *life, u_short *nbat) -{ - u32 eax; - u32 ebx; - u32 ecx; - u32 edx; - u32 esi; - - if (apm_info.connection_version < 0x0102) { - /* pretend we only have one battery. */ - if (which != 1) - return APM_BAD_DEVICE; - *nbat = 1; - return apm_get_power_status(status, bat, life); - } - - if (apm_bios_call(APM_FUNC_GET_STATUS, (0x8000 | (which)), 0, &eax, - &ebx, &ecx, &edx, &esi)) - return (eax >> 8) & 0xff; - *status = ebx; - *bat = ecx; - *life = edx; - *nbat = esi; - return APM_SUCCESS; -} -#endif - /** * apm_engage_power_management - enable PM on a device * @device: identity of device |