Make better use of banked registers in FIQ mode to shrink the iPod FIQ

handler a bit.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8920 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 6 insertions, 0 deletions

diff --git a/firmware/crt0.S b/firmware/crt0.S
index 061ffebeab..e7210e6d78 100644
--- a/firmware/crt0.S
+++ b/firmware/crt0.S
@@ -285,6 +285,12 @@ boot_table:
     /* Set up stack for FIQ mode */ 
     msr    cpsr_c, #0xd1
     ldr    sp, =fiq_stack
+#if CONFIG_CPU == PP5020 || CONFIG_CPU == PP5002
+    /* We'll load the banked FIQ mode registers with useful values here.
+       These values will be used in the FIQ handler in pcm_playback.c */
+    ldr    r12, =0x70002800 /* IISCONFIG */
+    ldr    r11, =p
+#endif
     /* Let abort mode use IRQ stack */
     msr    cpsr_c, #0xd7
     ldr    sp, =irq_stack