On Tuesday 30 January 2007 13:16, Matt Domsch wrote: > FYI, this was sent to lkml. I haven't reviewed yet. I objected to the original LKML patch. Frederic then posted a different one that adds x86 wrappers, similar to what ia64 already has. That one affects only x86, and seems fine to me. Bjorn > ----- Forwarded message from Fr?d?ric Riss <frederic.riss@xxxxxxxxx> ----- > > Subject: [PATCH] EFI x86: pass firmware call parameters on the stack > From: Fr?d?ric Riss <frederic.riss@xxxxxxxxx> > To: linux-kernel@xxxxxxxxxxxxxxx > Cc: artiom.myaskouvskey@xxxxxxxxx, bjorn.helgaas@xxxxxx, akpm@xxxxxxxx, > Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Date: Tue, 30 Jan 2007 20:01:18 +0100 > > > When calling into an 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 > when run in EFI mode (efi.get_time is called during the suspend phase). > > Signed-off-by: Frederic Riss <frederic.riss@xxxxxxxxx> > > --- > > [As I couldn't find an official maintainer for the linux/efi.h file and > the file header is quite old, I'm Cc:ing the last 2 commiters.] > > This patch fixes the issue for x86, but the file is also used by IA64. I > would have used asmlinkage to force arguments on the stack, but it has a > special meaning on IA64, thus I used a raw regparm(0) GCC attribute. > This attribute is documented only for x86, I hope it has no side effect > on other archs. > > diff --git a/include/linux/efi.h b/include/linux/efi.h > index df1c918..1db5321 100644 > --- a/include/linux/efi.h > +++ b/include/linux/efi.h > @@ -157,25 +157,35 @@ typedef struct { > unsigned long reset_system; > } efi_runtime_services_t; > > -typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc); > -typedef efi_status_t efi_set_time_t (efi_time_t *tm); > +typedef efi_status_t efi_get_time_t (efi_time_t *tm, efi_time_cap_t *tc) > + __attribute__((regparm(0))); > +typedef efi_status_t efi_set_time_t (efi_time_t *tm) > + __attribute__((regparm(0))); > typedef efi_status_t efi_get_wakeup_time_t (efi_bool_t *enabled, efi_bool_t *pending, > - efi_time_t *tm); > -typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm); > + efi_time_t *tm) > + __attribute__((regparm(0))); > +typedef efi_status_t efi_set_wakeup_time_t (efi_bool_t enabled, efi_time_t *tm) > + __attribute__((regparm(0))); > typedef efi_status_t efi_get_variable_t (efi_char16_t *name, efi_guid_t *vendor, u32 *attr, > - unsigned long *data_size, void *data); > + unsigned long *data_size, void *data) > + __attribute__((regparm(0))); > typedef efi_status_t efi_get_next_variable_t (unsigned long *name_size, efi_char16_t *name, > - efi_guid_t *vendor); > + efi_guid_t *vendor) > + __attribute__((regparm(0))); > typedef efi_status_t efi_set_variable_t (efi_char16_t *name, efi_guid_t *vendor, > unsigned long attr, unsigned long data_size, > - void *data); > -typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count); > + void *data) > + __attribute__((regparm(0))); > +typedef efi_status_t efi_get_next_high_mono_count_t (u32 *count) > + __attribute__((regparm(0))); > typedef void efi_reset_system_t (int reset_type, efi_status_t status, > - unsigned long data_size, efi_char16_t *data); > + unsigned long data_size, efi_char16_t *data) > + __attribute__((regparm(0))); > typedef efi_status_t efi_set_virtual_address_map_t (unsigned long memory_map_size, > unsigned long descriptor_size, > u32 descriptor_version, > - efi_memory_desc_t *virtual_map); > + efi_memory_desc_t *virtual_map) > + __attribute__((regparm(0))); > > /* > * EFI Configuration Table and GUID definitions > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > > ----- End forwarded message ----- > - > To unsubscribe from this list: send the line "unsubscribe linux-ia64" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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