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Fix the PP5002 crash bug affecting iPod 1st, 2nd and 3rd Gen. Yet another of those PP5002 quirks...

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16547 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2008-03-07 23:44:46 +00:00
parent 2ccdc48ee9
commit cb57bf863a
1 changed files with 11 additions and 3 deletions
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14
firmware/thread.c
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@ -466,11 +466,19 @@ static inline void core_sleep(unsigned int core)
"strb r0, [%[sem], #2] \n"
"ldrb r0, [%[sem], #1] \n" /* && stay_awake == 0? */
"cmp r0, #0 \n"
"moveq r0, #0xca \n" /* Then sleep */
"streqb r0, [%[ctl], %[c], lsl #2] \n"
"bne 2f \n"
/* Sleep: PP5002 crashes if the instruction that puts it to sleep is
* located at 0xNNNNNNN0. 4/8/C works. This sequence makes sure
* that the correct alternative is executed. Don't change the order
* of the next 4 instructions! */
"tst pc, #0x0c \n"
"mov r0, #0xca \n"
"strne r0, [%[ctl], %[c], lsl #2] \n"
"streq r0, [%[ctl], %[c], lsl #2] \n"
"nop \n" /* nop's needed because of pipeline */
"nop \n"
"nop \n"
"2: \n"
"mov r0, #0 \n" /* Clear stay_awake and sleep intent */
"strb r0, [%[sem], #1] \n"
"strb r0, [%[sem], #2] \n"
@ -593,7 +601,7 @@ void core_wake(unsigned int othercore)
"tst r1, r2, lsr %[oc] \n"
"ldrne r2, =0xcf004054 \n" /* If sleeping, wake it */
"movne r1, #0xce \n"
"strneb r1, [r2, %[oc], lsl #2] \n"
"strne r1, [r2, %[oc], lsl #2] \n"
"mov r1, #0 \n" /* Done with wake procedure */
"strb r1, [%[sem], #0] \n"
"msr cpsr_c, r3 \n" /* Restore int status */