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2011-07-14 Jennifer Averett <Jennifer.Averett@OARcorp.com>

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* start/start.S: Moved enable_sse into a subroutine that may be called
	from other cores on an SMP system.
This commit is contained in:
Jennifer Averett
2011-07-14 15:07:21 +00:00
parent 1ca54022df
commit 7521e439b0
2 changed files with 29 additions and 19 deletions
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5
c/src/lib/libbsp/i386/pc386/ChangeLog
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@@ -1,3 +1,8 @@
2011-07-14 Jennifer Averett <Jennifer.Averett@OARcorp.com>
* start/start.S: Moved enable_sse into a subroutine that may be called
from other cores on an SMP system.
2011-07-14 Till Straumann <strauman@slac.stanford.edu>
PR 1833/bsps

43
c/src/lib/libbsp/i386/pc386/start/start.S
View File

@@ -214,6 +214,27 @@ SYM (zero_bss):
+---------------------------------------------------------------------*/
call SYM(BSP_console_select)
#ifdef __SSE__
call SYM(enable_sse)
#endif
/*---------------------------------------------------------------------+
| Transfer control to User's Board Support Package
| Note: at the top we reserved space for the argument
| so that
| initial_esp = ( TOS - 4 ) & ~(CPU_STACK_ALIGNMENT-1)
| this ensures that
| 1) esp is now aligned
| 2) there is space for the cmdline pointer which we just
| may store at *(esp)
+---------------------------------------------------------------------*/
movl $SYM(_boot_multiboot_cmdline), (esp)
call SYM (boot_card)
cli # stops interrupts from being processed after hlt!
hlt # shutdown
#ifdef __SSE__
/*--------------------------------------------------------------------+
| Enable SSE; we really only care about fxsave/fxrstor and leave
@@ -221,6 +242,8 @@ SYM (zero_bss):
| But as a courtesy we make sure we don't execute on hardware
| that doesn't support features possibly used by the compiler.
+---------------------------------------------------------------------*/
PUBLIC (enable_sse)
SYM(enable_sse):
movl SYM (x86_capability), eax
testl $0x01000000, eax
jne 1f
@@ -250,26 +273,8 @@ SYM (zero_bss):
mov cr4, eax # OK to enable now
or $0x600, eax
mov eax, cr4
#endif
ret
/*---------------------------------------------------------------------+
| Transfer control to User's Board Support Package
| Note: at the top we reserved space for the argument
| so that
| initial_esp = ( TOS - 4 ) & ~(CPU_STACK_ALIGNMENT-1)
| this ensures that
| 1) esp is now aligned
| 2) there is space for the cmdline pointer which we just
| may store at *(esp)
+---------------------------------------------------------------------*/
movl $SYM(_boot_multiboot_cmdline), (esp)
call SYM (boot_card)
cli # stops interrupts from being processed after hlt!
hlt # shutdown
#ifdef __SSE__
SYM(_sse_panic):
call SYM(printk)
1: hlt