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authorFrédéric Riss <frederic.riss@gmail.com>2007-01-30 15:41:17 -0500
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-04 13:27:10 -0500
commit40c373cc3af9720d1cec0e32c3da26b1d220a95b (patch)
treeadec525ed9e80a3b923302a273b7524c231d614d /arch/i386/kernel/efi.c
parent886ae1fa1380309d91cdb7e67bd4bf71e053c1d5 (diff)
[PATCH] EFI x86: pass firmware call parameters on the stack
When calling into the EFI firmware, the parameters need to be passed on the stack. The recent change to use -mregparm=3 breaks x86 EFI support. This patch is needed to allow the new Intel-based Macs to suspend to ram (efi.get_time is called during the suspend phase). Signed-off-by: Frederic Riss <frederic.riss@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/i386/kernel/efi.c')
-rw-r--r--arch/i386/kernel/efi.c89
1 files changed, 73 insertions, 16 deletions
diff --git a/arch/i386/kernel/efi.c b/arch/i386/kernel/efi.c
index b92c7f0a358a..8f9c624ace6f 100644
--- a/arch/i386/kernel/efi.c
+++ b/arch/i386/kernel/efi.c
@@ -473,6 +473,70 @@ static inline void __init check_range_for_systab(efi_memory_desc_t *md)
473} 473}
474 474
475/* 475/*
476 * Wrap all the virtual calls in a way that forces the parameters on the stack.
477 */
478
479#define efi_call_virt(f, args...) \
480 ((efi_##f##_t __attribute__((regparm(0)))*)efi.systab->runtime->f)(args)
481
482static efi_status_t virt_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
483{
484 return efi_call_virt(get_time, tm, tc);
485}
486
487static efi_status_t virt_efi_set_time (efi_time_t *tm)
488{
489 return efi_call_virt(set_time, tm);
490}
491
492static efi_status_t virt_efi_get_wakeup_time (efi_bool_t *enabled,
493 efi_bool_t *pending,
494 efi_time_t *tm)
495{
496 return efi_call_virt(get_wakeup_time, enabled, pending, tm);
497}
498
499static efi_status_t virt_efi_set_wakeup_time (efi_bool_t enabled,
500 efi_time_t *tm)
501{
502 return efi_call_virt(set_wakeup_time, enabled, tm);
503}
504
505static efi_status_t virt_efi_get_variable (efi_char16_t *name,
506 efi_guid_t *vendor, u32 *attr,
507 unsigned long *data_size, void *data)
508{
509 return efi_call_virt(get_variable, name, vendor, attr, data_size, data);
510}
511
512static efi_status_t virt_efi_get_next_variable (unsigned long *name_size,
513 efi_char16_t *name,
514 efi_guid_t *vendor)
515{
516 return efi_call_virt(get_next_variable, name_size, name, vendor);
517}
518
519static efi_status_t virt_efi_set_variable (efi_char16_t *name,
520 efi_guid_t *vendor,
521 unsigned long attr,
522 unsigned long data_size, void *data)
523{
524 return efi_call_virt(set_variable, name, vendor, attr, data_size, data);
525}
526
527static efi_status_t virt_efi_get_next_high_mono_count (u32 *count)
528{
529 return efi_call_virt(get_next_high_mono_count, count);
530}
531
532static void virt_efi_reset_system (int reset_type, efi_status_t status,
533 unsigned long data_size,
534 efi_char16_t *data)
535{
536 efi_call_virt(reset_system, reset_type, status, data_size, data);
537}
538
539/*
476 * This function will switch the EFI runtime services to virtual mode. 540 * This function will switch the EFI runtime services to virtual mode.
477 * Essentially, look through the EFI memmap and map every region that 541 * Essentially, look through the EFI memmap and map every region that
478 * has the runtime attribute bit set in its memory descriptor and update 542 * has the runtime attribute bit set in its memory descriptor and update
@@ -525,22 +589,15 @@ void __init efi_enter_virtual_mode(void)
525 * pointers in the runtime service table to the new virtual addresses. 589 * pointers in the runtime service table to the new virtual addresses.
526 */ 590 */
527 591
528 efi.get_time = (efi_get_time_t *) efi.systab->runtime->get_time; 592 efi.get_time = virt_efi_get_time;
529 efi.set_time = (efi_set_time_t *) efi.systab->runtime->set_time; 593 efi.set_time = virt_efi_set_time;
530 efi.get_wakeup_time = (efi_get_wakeup_time_t *) 594 efi.get_wakeup_time = virt_efi_get_wakeup_time;
531 efi.systab->runtime->get_wakeup_time; 595 efi.set_wakeup_time = virt_efi_set_wakeup_time;
532 efi.set_wakeup_time = (efi_set_wakeup_time_t *) 596 efi.get_variable = virt_efi_get_variable;
533 efi.systab->runtime->set_wakeup_time; 597 efi.get_next_variable = virt_efi_get_next_variable;
534 efi.get_variable = (efi_get_variable_t *) 598 efi.set_variable = virt_efi_set_variable;
535 efi.systab->runtime->get_variable; 599 efi.get_next_high_mono_count = virt_efi_get_next_high_mono_count;
536 efi.get_next_variable = (efi_get_next_variable_t *) 600 efi.reset_system = virt_efi_reset_system;
537 efi.systab->runtime->get_next_variable;
538 efi.set_variable = (efi_set_variable_t *)
539 efi.systab->runtime->set_variable;
540 efi.get_next_high_mono_count = (efi_get_next_high_mono_count_t *)
541 efi.systab->runtime->get_next_high_mono_count;
542 efi.reset_system = (efi_reset_system_t *)
543 efi.systab->runtime->reset_system;
544} 601}
545 602
546void __init 603void __init