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| author | Till Straumann <strauman@slac.stanford.edu> | 2009-11-10 06:51:52 +0000 |
|---|---|---|
| committer | Till Straumann <strauman@slac.stanford.edu> | 2009-11-10 06:51:52 +0000 |
| commit | 4a4201cb410c4d3816fc1e0123982b90046ea19c (patch) | |
| tree | 492f5a507ef61f8e138dad8e124f8ac4b8af8e59 /c/src/lib/libbsp/i386/shared/irq/irq_asm.S | |
| parent | 2009-11-09 Till Straumann <strauman@slac.stanford.edu> (diff) | |
| download | rtems-4a4201cb410c4d3816fc1e0123982b90046ea19c.tar.bz2 | |
2009-11-10 Till Straumann <strauman@slac.stanford.edu>
* pc386/make/custom/pc586-sse.cfg, pc386/start/start.S,
shared/irq/irq_asm.S: Added experimental SSE support.
Diffstat (limited to 'c/src/lib/libbsp/i386/shared/irq/irq_asm.S')
| -rw-r--r-- | c/src/lib/libbsp/i386/shared/irq/irq_asm.S | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/shared/irq/irq_asm.S b/c/src/lib/libbsp/i386/shared/irq/irq_asm.S index 1335bd749d..be0bcbb859 100644 --- a/c/src/lib/libbsp/i386/shared/irq/irq_asm.S +++ b/c/src/lib/libbsp/i386/shared/irq/irq_asm.S @@ -24,7 +24,12 @@ #define MSK_OFF 4 #define EBP_OFF 8 /* code restoring ebp/esp relies on */ #define ESP_OFF 12 /* esp being on top of ebp! */ +#ifdef __SSE__ +#define FRM_SIZ (16+512) +#define SSE_OFF 16 +#else #define FRM_SIZ 16 +#endif BEGIN_CODE @@ -70,6 +75,27 @@ SYM (_ISR_Handler): movl eax, ESP_OFF(esp) movl ebp, EBP_OFF(esp) +#ifdef __SSE__ + /* NOTE: SSE only is supported if the BSP enables fxsave/fxrstor + * to save/restore SSE context! This is so far only implemented + * for pc386!. + */ + + /* We save SSE here (on the task stack) because we possibly + * call other C-code (besides the ISR, namely _Thread_Dispatch() + * or _ThreadProcessSignalsFromIrq()). + */ + /* don't wait here; a possible exception condition will eventually be + * detected when the task resumes control and executes a FP instruction + fwait + */ + fxsave SSE_OFF(esp) + fninit /* clean-slate FPU */ + movl $0x1f80, ARG_OFF(esp) /* use ARG_OFF as scratch space */ + ldmxcsr ARG_OFF(esp) /* clean-slate MXCSR */ +#endif + + /* * acknowledge the interrupt * @@ -197,6 +223,12 @@ nested: * eip, CS, Flags). */ .exit: + +#ifdef __SSE__ + fwait + fxrstor SSE_OFF(esp) +#endif + /* restore ebp and original esp */ addl $EBP_OFF, esp popl ebp |